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gerrit-public.fairphone.software / platform / external / skqp / 856b3c3a8c37deac5aa6f5db0e743036e8c56b95 / . / src / gpu / gl / GrGLCaps.cpp
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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLCaps.h"
#include "GrContextOptions.h"
#include "GrGLContext.h"
#include "GrGLRenderTarget.h"
#include "GrGLTexture.h"
#include "GrShaderCaps.h"
#include "GrSurfaceProxyPriv.h"
#include "SkJSONWriter.h"
#include "SkTSearch.h"
#include "SkTSort.h"
#include "instanced/GLInstancedRendering.h"
GrGLCaps::GrGLCaps(const GrContextOptions& contextOptions,
const GrGLContextInfo& ctxInfo,
const GrGLInterface* glInterface) : INHERITED(contextOptions) {
fStandard = ctxInfo.standard();
fStencilFormats.reset();
fMSFBOType = kNone_MSFBOType;
fInvalidateFBType = kNone_InvalidateFBType;
fMapBufferType = kNone_MapBufferType;
fTransferBufferType = kNone_TransferBufferType;
fMaxFragmentUniformVectors = 0;
fUnpackRowLengthSupport = false;
fUnpackFlipYSupport = false;
fPackRowLengthSupport = false;
fPackFlipYSupport = false;
fTextureUsageSupport = false;
fTextureRedSupport = false;
fAlpha8IsRenderable = false;
fImagingSupport = false;
fVertexArrayObjectSupport = false;
fDirectStateAccessSupport = false;
fDebugSupport = false;
fES2CompatibilitySupport = false;
fDrawIndirectSupport = false;
fMultiDrawIndirectSupport = false;
fBaseInstanceSupport = false;
fIsCoreProfile = false;
fBindFragDataLocationSupport = false;
fRectangleTextureSupport = false;
fTextureSwizzleSupport = false;
fRGBA8888PixelsOpsAreSlow = false;
fPartialFBOReadIsSlow = false;
fMipMapLevelAndLodControlSupport = false;
fRGBAToBGRAReadbackConversionsAreSlow = false;
fDoManualMipmapping = false;
fSRGBDecodeDisableAffectsMipmaps = false;
fClearToBoundaryValuesIsBroken = false;
fClearTextureSupport = false;
fDrawArraysBaseVertexIsBroken = false;
fUseDrawToClearStencilClip = false;
fDisallowTexSubImageForUnormConfigTexturesEverBoundToFBO = false;
fUseDrawInsteadOfAllRenderTargetWrites = false;
fRequiresCullFaceEnableDisableWhenDrawingLinesAfterNonLines = false;
fBlitFramebufferFlags = kNoSupport_BlitFramebufferFlag;
fShaderCaps.reset(new GrShaderCaps(contextOptions));
this->init(contextOptions, ctxInfo, glInterface);
}
void GrGLCaps::init(const GrContextOptions& contextOptions,
const GrGLContextInfo& ctxInfo,
const GrGLInterface* gli) {
GrGLStandard standard = ctxInfo.standard();
GrGLVersion version = ctxInfo.version();
if (kGLES_GrGLStandard == standard) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_VECTORS,
&fMaxFragmentUniformVectors);
} else {
SkASSERT(kGL_GrGLStandard == standard);
GrGLint max;
GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &max);
fMaxFragmentUniformVectors = max / 4;
if (version >= GR_GL_VER(3, 2)) {
GrGLint profileMask;
GR_GL_GetIntegerv(gli, GR_GL_CONTEXT_PROFILE_MASK, &profileMask);
fIsCoreProfile = SkToBool(profileMask & GR_GL_CONTEXT_CORE_PROFILE_BIT);
}
}
GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_ATTRIBS, &fMaxVertexAttributes);
if (kGL_GrGLStandard == standard) {
fUnpackRowLengthSupport = true;
fUnpackFlipYSupport = false;
fPackRowLengthSupport = true;
fPackFlipYSupport = false;
} else {
fUnpackRowLengthSupport = version >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_EXT_unpack_subimage");
fUnpackFlipYSupport = ctxInfo.hasExtension("GL_CHROMIUM_flipy");
fPackRowLengthSupport = version >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_NV_pack_subimage");
fPackFlipYSupport =
ctxInfo.hasExtension("GL_ANGLE_pack_reverse_row_order");
}
fTextureUsageSupport = (kGLES_GrGLStandard == standard) &&
ctxInfo.hasExtension("GL_ANGLE_texture_usage");
if (kGL_GrGLStandard == standard) {
fTextureBarrierSupport = version >= GR_GL_VER(4,5) ||
ctxInfo.hasExtension("GL_ARB_texture_barrier") ||
ctxInfo.hasExtension("GL_NV_texture_barrier");
} else {
fTextureBarrierSupport = ctxInfo.hasExtension("GL_NV_texture_barrier");
}
if (kGL_GrGLStandard == standard) {
fSampleLocationsSupport = version >= GR_GL_VER(3,2) ||
ctxInfo.hasExtension("GL_ARB_texture_multisample");
} else {
fSampleLocationsSupport = version >= GR_GL_VER(3,1);
}
// ARB_texture_rg is part of OpenGL 3.0, but osmesa doesn't support GL_RED
// and GL_RG on FBO textures.
if (kOSMesa_GrGLRenderer != ctxInfo.renderer()) {
if (kGL_GrGLStandard == standard) {
fTextureRedSupport = version >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_ARB_texture_rg");
} else {
fTextureRedSupport = version >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_EXT_texture_rg");
}
}
fImagingSupport = kGL_GrGLStandard == standard &&
ctxInfo.hasExtension("GL_ARB_imaging");
// A driver but on the nexus 6 causes incorrect dst copies when invalidate is called beforehand.
// Thus we are blacklisting this extension for now on Adreno4xx devices.
if (kAdreno4xx_GrGLRenderer != ctxInfo.renderer() &&
((kGL_GrGLStandard == standard && version >= GR_GL_VER(4,3)) ||
(kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0)) ||
ctxInfo.hasExtension("GL_ARB_invalidate_subdata"))) {
fDiscardRenderTargetSupport = true;
fInvalidateFBType = kInvalidate_InvalidateFBType;
} else if (ctxInfo.hasExtension("GL_EXT_discard_framebuffer")) {
fDiscardRenderTargetSupport = true;
fInvalidateFBType = kDiscard_InvalidateFBType;
}
if (kARM_GrGLVendor == ctxInfo.vendor() || kImagination_GrGLVendor == ctxInfo.vendor()) {
fFullClearIsFree = true;
}
if (kGL_GrGLStandard == standard) {
fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_ARB_vertex_array_object") ||
ctxInfo.hasExtension("GL_APPLE_vertex_array_object");
} else {
fVertexArrayObjectSupport = version >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_OES_vertex_array_object");
}
if (kGL_GrGLStandard == standard) {
fDirectStateAccessSupport = ctxInfo.hasExtension("GL_EXT_direct_state_access");
} else {
fDirectStateAccessSupport = false;
}
if (kGL_GrGLStandard == standard && version >= GR_GL_VER(4,3)) {
fDebugSupport = true;
} else {
fDebugSupport = ctxInfo.hasExtension("GL_KHR_debug");
}
if (kGL_GrGLStandard == standard) {
fES2CompatibilitySupport = ctxInfo.hasExtension("GL_ARB_ES2_compatibility");
}
else {
fES2CompatibilitySupport = true;
}
if (kGL_GrGLStandard == standard) {
fMultisampleDisableSupport = true;
} else {
fMultisampleDisableSupport = ctxInfo.hasExtension("GL_EXT_multisample_compatibility");
}
if (kGL_GrGLStandard == standard) {
// 3.1 has draw_instanced but not instanced_arrays, for the time being we only care about
// instanced arrays, but we could make this more granular if we wanted
fInstanceAttribSupport =
version >= GR_GL_VER(3, 2) ||
(ctxInfo.hasExtension("GL_ARB_draw_instanced") &&
ctxInfo.hasExtension("GL_ARB_instanced_arrays"));
} else {
fInstanceAttribSupport =
version >= GR_GL_VER(3, 0) ||
(ctxInfo.hasExtension("GL_EXT_draw_instanced") &&
ctxInfo.hasExtension("GL_EXT_instanced_arrays"));
}
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 0)) {
fBindFragDataLocationSupport = true;
}
} else {
if (version >= GR_GL_VER(3, 0) && ctxInfo.hasExtension("GL_EXT_blend_func_extended")) {
fBindFragDataLocationSupport = true;
}
}
fBindUniformLocationSupport = ctxInfo.hasExtension("GL_CHROMIUM_bind_uniform_location");
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 1) || ctxInfo.hasExtension("GL_ARB_texture_rectangle")) {
// We also require textureSize() support for rectangle 2D samplers which was added in
// GLSL 1.40.
if (ctxInfo.glslGeneration() >= k140_GrGLSLGeneration) {
fRectangleTextureSupport = true;
}
}
} else {
// Command buffer exposes this in GL ES context for Chromium reasons,
// but it should not be used. Also, at the time of writing command buffer
// lacks TexImage2D support and ANGLE lacks GL ES 3.0 support.
}
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3,3) || ctxInfo.hasExtension("GL_ARB_texture_swizzle")) {
fTextureSwizzleSupport = true;
}
} else {
if (version >= GR_GL_VER(3,0)) {
fTextureSwizzleSupport = true;
}
}
if (kGL_GrGLStandard == standard) {
fMipMapLevelAndLodControlSupport = true;
} else if (kGLES_GrGLStandard == standard) {
if (version >= GR_GL_VER(3,0)) {
fMipMapLevelAndLodControlSupport = true;
}
}
#ifdef SK_BUILD_FOR_WIN
// We're assuming that on Windows Chromium we're using ANGLE.
bool isANGLE = kANGLE_GrGLDriver == ctxInfo.driver() ||
kChromium_GrGLDriver == ctxInfo.driver();
// Angle has slow read/write pixel paths for 32bit RGBA (but fast for BGRA).
fRGBA8888PixelsOpsAreSlow = isANGLE;
// On DX9 ANGLE reading a partial FBO is slow. TODO: Check whether this is still true and
// check DX11 ANGLE.
fPartialFBOReadIsSlow = isANGLE;
#endif
bool isMESA = kMesa_GrGLDriver == ctxInfo.driver();
bool isMAC = false;
#ifdef SK_BUILD_FOR_MAC
isMAC = true;
#endif
// Both mesa and mac have reduced performance if reading back an RGBA framebuffer as BGRA or
// vis-versa.
fRGBAToBGRAReadbackConversionsAreSlow = isMESA || isMAC;
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(4,4) || ctxInfo.hasExtension("GL_ARB_clear_texture")) {
// glClearTexImage seems to have a bug in NVIDIA drivers that was fixed sometime between
// 340.96 and 367.57.
if (ctxInfo.driver() != kNVIDIA_GrGLDriver ||
ctxInfo.driverVersion() >= GR_GL_DRIVER_VER(367, 57)) {
fClearTextureSupport = true;
}
}
} else if (ctxInfo.hasExtension("GL_EXT_clear_texture")) {
// Calling glClearTexImage crashes on the NexusPlayer.
if (kPowerVRRogue_GrGLRenderer != ctxInfo.renderer()) {
fClearTextureSupport = true;
}
}
/**************************************************************************
* GrShaderCaps fields
**************************************************************************/
// This must be called after fCoreProfile is set on the GrGLCaps
this->initGLSL(ctxInfo);
GrShaderCaps* shaderCaps = fShaderCaps.get();
if (!contextOptions.fSuppressPathRendering) {
shaderCaps->fPathRenderingSupport = this->hasPathRenderingSupport(ctxInfo, gli);
}
// For now these two are equivalent but we could have dst read in shader via some other method.
// Before setting this, initGLSL() must have been called.
shaderCaps->fDstReadInShaderSupport = shaderCaps->fFBFetchSupport;
// Enable supported shader-related caps
if (kGL_GrGLStandard == standard) {
shaderCaps->fDualSourceBlendingSupport = (ctxInfo.version() >= GR_GL_VER(3, 3) ||
ctxInfo.hasExtension("GL_ARB_blend_func_extended")) &&
GrGLSLSupportsNamedFragmentShaderOutputs(ctxInfo.glslGeneration());
shaderCaps->fShaderDerivativeSupport = true;
// we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
shaderCaps->fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3, 2) &&
ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
shaderCaps->fIntegerSupport = ctxInfo.version() >= GR_GL_VER(3, 0) &&
ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
}
else {
shaderCaps->fDualSourceBlendingSupport = ctxInfo.hasExtension("GL_EXT_blend_func_extended");
shaderCaps->fShaderDerivativeSupport = ctxInfo.version() >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_OES_standard_derivatives");
shaderCaps->fGeometryShaderSupport = ctxInfo.hasExtension("GL_EXT_geometry_shader");
shaderCaps->fIntegerSupport = ctxInfo.version() >= GR_GL_VER(3, 0) &&
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
}
// Protect ourselves against tracking huge amounts of texture state.
static const uint8_t kMaxSaneSamplers = 32;
GrGLint maxSamplers;
GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &maxSamplers);
shaderCaps->fMaxVertexSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
if (shaderCaps->fGeometryShaderSupport) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS, &maxSamplers);
shaderCaps->fMaxGeometrySamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
}
GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &maxSamplers);
shaderCaps->fMaxFragmentSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
GR_GL_GetIntegerv(gli, GR_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxSamplers);
shaderCaps->fMaxCombinedSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
if (kGL_GrGLStandard == standard) {
shaderCaps->fImageLoadStoreSupport = ctxInfo.version() >= GR_GL_VER(4, 2);
if (!shaderCaps->fImageLoadStoreSupport &&
ctxInfo.hasExtension("GL_ARB_shader_image_load_store")) {
shaderCaps->fImageLoadStoreSupport = true;
shaderCaps->fImageLoadStoreExtensionString = "GL_ARB_shader_image_load_store";
}
} else {
shaderCaps->fImageLoadStoreSupport = ctxInfo.version() >= GR_GL_VER(3, 1);
}
if (shaderCaps->fImageLoadStoreSupport) {
// Protect ourselves against tracking huge amounts of image state.
static constexpr int kMaxSaneImages = 4;
GrGLint maxUnits;
GR_GL_GetIntegerv(gli, GR_GL_MAX_IMAGE_UNITS, &maxUnits);
GR_GL_GetIntegerv(gli, GR_GL_MAX_VERTEX_IMAGE_UNIFORMS,
&shaderCaps->fMaxVertexImageStorages);
if (shaderCaps->fGeometryShaderSupport) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_GEOMETRY_IMAGE_UNIFORMS,
&shaderCaps->fMaxGeometryImageStorages);
}
GR_GL_GetIntegerv(gli, GR_GL_MAX_FRAGMENT_IMAGE_UNIFORMS,
&shaderCaps->fMaxFragmentImageStorages);
GR_GL_GetIntegerv(gli, GR_GL_MAX_COMBINED_IMAGE_UNIFORMS,
&shaderCaps->fMaxCombinedImageStorages);
// We use one unit for every image uniform
shaderCaps->fMaxCombinedImageStorages = SkTMin(SkTMin(shaderCaps->fMaxCombinedImageStorages,
maxUnits), kMaxSaneImages);
shaderCaps->fMaxVertexImageStorages = SkTMin(maxUnits,
shaderCaps->fMaxVertexImageStorages);
shaderCaps->fMaxGeometryImageStorages = SkTMin(maxUnits,
shaderCaps->fMaxGeometryImageStorages);
shaderCaps->fMaxFragmentImageStorages = SkTMin(maxUnits,
shaderCaps->fMaxFragmentImageStorages);
}
// SGX and Mali GPUs that are based on a tiled-deferred architecture that have trouble with
// frequently changing VBOs. We've measured a performance increase using non-VBO vertex
// data for dynamic content on these GPUs. Perhaps we should read the renderer string and
// limit this decision to specific GPU families rather than basing it on the vendor alone.
if (!GR_GL_MUST_USE_VBO &&
!fIsCoreProfile &&
(kARM_GrGLVendor == ctxInfo.vendor() ||
kImagination_GrGLVendor == ctxInfo.vendor() ||
kQualcomm_GrGLVendor == ctxInfo.vendor())) {
fPreferClientSideDynamicBuffers = true;
}
if (!contextOptions.fAvoidStencilBuffers) {
// To reduce surface area, if we avoid stencil buffers, we also disable MSAA.
this->initFSAASupport(contextOptions, ctxInfo, gli);
this->initStencilSupport(ctxInfo);
}
// Setup blit framebuffer
if (kGL_GrGLStandard != ctxInfo.standard()) {
if (ctxInfo.version() >= GR_GL_VER(3, 0)) {
fBlitFramebufferFlags = kNoFormatConversionForMSAASrc_BlitFramebufferFlag |
kNoMSAADst_BlitFramebufferFlag |
kRectsMustMatchForMSAASrc_BlitFramebufferFlag;
} else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample") ||
ctxInfo.hasExtension("GL_ANGLE_framebuffer_blit")) {
// The CHROMIUM extension uses the ANGLE version of glBlitFramebuffer and includes its
// limitations.
fBlitFramebufferFlags = kNoScalingOrMirroring_BlitFramebufferFlag |
kResolveMustBeFull_BlitFrambufferFlag |
kNoMSAADst_BlitFramebufferFlag |
kNoFormatConversion_BlitFramebufferFlag |
kRectsMustMatchForMSAASrc_BlitFramebufferFlag;
}
} else {
if (fUsesMixedSamples ||
ctxInfo.version() >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_ARB_framebuffer_object") ||
ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
fBlitFramebufferFlags = 0;
}
}
this->initBlendEqationSupport(ctxInfo);
if (kGL_GrGLStandard == standard) {
fMapBufferFlags = kCanMap_MapFlag; // we require VBO support and the desktop VBO
// extension includes glMapBuffer.
if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_map_buffer_range")) {
fMapBufferFlags |= kSubset_MapFlag;
fMapBufferType = kMapBufferRange_MapBufferType;
} else {
fMapBufferType = kMapBuffer_MapBufferType;
}
} else {
// Unextended GLES2 doesn't have any buffer mapping.
fMapBufferFlags = kNone_MapBufferType;
if (ctxInfo.hasExtension("GL_CHROMIUM_map_sub")) {
fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
fMapBufferType = kChromium_MapBufferType;
} else if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_EXT_map_buffer_range")) {
fMapBufferFlags = kCanMap_MapFlag | kSubset_MapFlag;
fMapBufferType = kMapBufferRange_MapBufferType;
} else if (ctxInfo.hasExtension("GL_OES_mapbuffer")) {
fMapBufferFlags = kCanMap_MapFlag;
fMapBufferType = kMapBuffer_MapBufferType;
}
}
// We found that the Galaxy J5 with an Adreno 306 running 6.0.1 has a bug where
// GL_INVALID_OPERATION thrown by glDrawArrays when using a buffer that was mapped. The same bug
// did not reproduce on a Nexus7 2013 with a 320 running Android M with driver 127.0. It's
// unclear whether this really affects a wide range of devices.
if (ctxInfo.renderer() == kAdreno3xx_GrGLRenderer && ctxInfo.driver() == kQualcomm_GrGLDriver &&
ctxInfo.driverVersion() > GR_GL_DRIVER_VER(127, 0)) {
fMapBufferType = kNone_MapBufferType;
fMapBufferFlags = kNone_MapFlags;
}
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_pixel_buffer_object")) {
fTransferBufferType = kPBO_TransferBufferType;
}
} else if (kANGLE_GrGLDriver != ctxInfo.driver()) { // TODO: re-enable for ANGLE
if (version >= GR_GL_VER(3, 0) ||
(ctxInfo.hasExtension("GL_NV_pixel_buffer_object") &&
// GL_EXT_unpack_subimage needed to support subtexture rectangles
ctxInfo.hasExtension("GL_EXT_unpack_subimage"))) {
fTransferBufferType = kPBO_TransferBufferType;
// TODO: get transfer buffers working in Chrome
// } else if (ctxInfo.hasExtension("GL_CHROMIUM_pixel_transfer_buffer_object")) {
// fTransferBufferType = kChromium_TransferBufferType;
}
}
// On many GPUs, map memory is very expensive, so we effectively disable it here by setting the
// threshold to the maximum unless the client gives us a hint that map memory is cheap.
if (fBufferMapThreshold < 0) {
#if 0
// We think mapping on Chromium will be cheaper once we know ahead of time how much space
// we will use for all GrMeshDrawOps. Right now we might wind up mapping a large buffer and
// using a small subset.
fBufferMapThreshold = kChromium_GrGLDriver == ctxInfo.driver() ? 0 : SK_MaxS32;
#else
fBufferMapThreshold = SK_MaxS32;
#endif
}
if (kGL_GrGLStandard == standard) {
fNPOTTextureTileSupport = true;
fMipMapSupport = true;
} else {
// Unextended ES2 supports NPOT textures with clamp_to_edge and non-mip filters only
// ES3 has no limitations.
fNPOTTextureTileSupport = ctxInfo.version() >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_OES_texture_npot");
// ES2 supports MIP mapping for POT textures but our caps don't allow for limited MIP
// support. The OES extension or ES 3.0 allow for MIPS on NPOT textures. So, apparently,
// does the undocumented GL_IMG_texture_npot extension. This extension does not seem to
// to alllow arbitrary wrap modes, however.
fMipMapSupport = fNPOTTextureTileSupport || ctxInfo.hasExtension("GL_IMG_texture_npot");
}
// Using MIPs on this GPU seems to be a source of trouble.
if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer()) {
fMipMapSupport = false;
}
GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_SIZE, &fMaxTextureSize);
GR_GL_GetIntegerv(gli, GR_GL_MAX_RENDERBUFFER_SIZE, &fMaxRenderTargetSize);
// Our render targets are always created with textures as the color
// attachment, hence this min:
fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);
fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");
// Disable scratch texture reuse on Mali and Adreno devices
fReuseScratchTextures = kARM_GrGLVendor != ctxInfo.vendor();
#if 0
fReuseScratchBuffers = kARM_GrGLVendor != ctxInfo.vendor() &&
kQualcomm_GrGLVendor != ctxInfo.vendor();
#endif
if (ctxInfo.hasExtension("GL_EXT_window_rectangles")) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_WINDOW_RECTANGLES, &fMaxWindowRectangles);
}
if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
kPowerVRRogue_GrGLRenderer == ctxInfo.renderer() ||
(kAdreno3xx_GrGLRenderer == ctxInfo.renderer() &&
ctxInfo.driver() != kChromium_GrGLDriver)) {
fUseDrawInsteadOfClear = true;
}
if (kAdreno4xx_GrGLRenderer == ctxInfo.renderer()) {
// This is known to be fixed sometime between driver 145.0 and 219.0
if (ctxInfo.driver() == kQualcomm_GrGLDriver &&
ctxInfo.driverVersion() <= GR_GL_DRIVER_VER(219, 0)) {
fUseDrawToClearStencilClip = true;
}
fDisallowTexSubImageForUnormConfigTexturesEverBoundToFBO = true;
}
// This was reproduced on the following configurations:
// - A Galaxy J5 (Adreno 306) running Android 6 with driver 140.0
// - A Nexus 7 2013 (Adreno 320) running Android 5 with driver 104.0
// - A Nexus 7 2013 (Adreno 320) running Android 6 with driver 127.0
// - A Nexus 5 (Adreno 330) running Android 6 with driver 127.0
// and not produced on:
// - A Nexus 7 2013 (Adreno 320) running Android 4 with driver 53.0
// The particular lines that get dropped from test images varies across different devices.
if (kAdreno3xx_GrGLRenderer == ctxInfo.renderer() && kQualcomm_GrGLDriver == ctxInfo.driver() &&
ctxInfo.driverVersion() > GR_GL_DRIVER_VER(53, 0)) {
fRequiresCullFaceEnableDisableWhenDrawingLinesAfterNonLines = true;
}
// Texture uploads sometimes seem to be ignored to textures bound to FBOS on Tegra3.
if (kTegra3_GrGLRenderer == ctxInfo.renderer()) {
fDisallowTexSubImageForUnormConfigTexturesEverBoundToFBO = true;
fUseDrawInsteadOfAllRenderTargetWrites = true;
}
#ifdef SK_BUILD_FOR_WIN
// On ANGLE deferring flushes can lead to GPU starvation
fPreferVRAMUseOverFlushes = !isANGLE;
#endif
if (kChromium_GrGLDriver == ctxInfo.driver()) {
fMustClearUploadedBufferData = true;
}
if (kGL_GrGLStandard == standard) {
// ARB allows mixed size FBO attachments, EXT does not.
if (ctxInfo.version() >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
fOversizedStencilSupport = true;
} else {
SkASSERT(ctxInfo.hasExtension("GL_EXT_framebuffer_object"));
}
} else {
// ES 3.0 supports mixed size FBO attachments, 2.0 does not.
fOversizedStencilSupport = ctxInfo.version() >= GR_GL_VER(3, 0);
}
if (kGL_GrGLStandard == standard) {
fDrawIndirectSupport = version >= GR_GL_VER(4,0) ||
ctxInfo.hasExtension("GL_ARB_draw_indirect");
fBaseInstanceSupport = version >= GR_GL_VER(4,2);
fMultiDrawIndirectSupport = version >= GR_GL_VER(4,3) ||
(fDrawIndirectSupport &&
!fBaseInstanceSupport && // The ARB extension has no base inst.
ctxInfo.hasExtension("GL_ARB_multi_draw_indirect"));
fDrawRangeElementsSupport = version >= GR_GL_VER(2,0);
} else {
fDrawIndirectSupport = version >= GR_GL_VER(3,1);
fMultiDrawIndirectSupport = fDrawIndirectSupport &&
ctxInfo.hasExtension("GL_EXT_multi_draw_indirect");
fBaseInstanceSupport = fDrawIndirectSupport &&
ctxInfo.hasExtension("GL_EXT_base_instance");
fDrawRangeElementsSupport = version >= GR_GL_VER(3,0);
}
this->initShaderPrecisionTable(ctxInfo, gli, shaderCaps);
if (contextOptions.fUseShaderSwizzling) {
fTextureSwizzleSupport = false;
}
if (kGL_GrGLStandard == standard) {
if ((version >= GR_GL_VER(4, 0) || ctxInfo.hasExtension("GL_ARB_sample_shading")) &&
ctxInfo.vendor() != kIntel_GrGLVendor) {
fSampleShadingSupport = true;
}
} else if (ctxInfo.hasExtension("GL_OES_sample_shading")) {
fSampleShadingSupport = true;
}
// TODO: support CHROMIUM_sync_point and maybe KHR_fence_sync
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 2) || ctxInfo.hasExtension("GL_ARB_sync")) {
fFenceSyncSupport = true;
}
} else if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_APPLE_sync")) {
fFenceSyncSupport = true;
}
// Safely moving textures between contexts requires fences.
fCrossContextTextureSupport = fFenceSyncSupport;
// We support manual mip-map generation (via iterative downsampling draw calls). This fixes
// bugs on some cards/drivers that produce incorrect mip-maps for sRGB textures when using
// glGenerateMipmap. Our implementation requires mip-level sampling control. Additionally,
// it can be much slower (especially on mobile GPUs), so we opt-in only when necessary:
if (fMipMapLevelAndLodControlSupport &&
(contextOptions.fDoManualMipmapping ||
(kIntel_GrGLVendor == ctxInfo.vendor()) ||
(kNVIDIA_GrGLDriver == ctxInfo.driver() && isMAC) ||
(kATI_GrGLVendor == ctxInfo.vendor()))) {
fDoManualMipmapping = true;
}
fSRGBDecodeDisableSupport = ctxInfo.hasExtension("GL_EXT_texture_sRGB_decode");
fSRGBDecodeDisableAffectsMipmaps = fSRGBDecodeDisableSupport &&
kChromium_GrGLDriver != ctxInfo.driver();
// See http://crbug.com/710443
#ifdef SK_BUILD_FOR_MAC
if (kIntel6xxx_GrGLRenderer == ctxInfo.renderer()) {
fClearToBoundaryValuesIsBroken = true;
}
#endif
if (kQualcomm_GrGLVendor == ctxInfo.vendor()) {
fDrawArraysBaseVertexIsBroken = true;
}
// Requires fTextureRedSupport, fTextureSwizzleSupport, msaa support, ES compatibility have
// already been detected.
this->initConfigTable(contextOptions, ctxInfo, gli, shaderCaps);
this->applyOptionsOverrides(contextOptions);
shaderCaps->applyOptionsOverrides(contextOptions);
}
const char* get_glsl_version_decl_string(GrGLStandard standard, GrGLSLGeneration generation,
bool isCoreProfile) {
switch (generation) {
case k110_GrGLSLGeneration:
if (kGLES_GrGLStandard == standard) {
// ES2s shader language is based on version 1.20 but is version
// 1.00 of the ES language.
return "#version 100\n";
} else {
SkASSERT(kGL_GrGLStandard == standard);
return "#version 110\n";
}
case k130_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == standard);
return "#version 130\n";
case k140_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == standard);
return "#version 140\n";
case k150_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == standard);
if (isCoreProfile) {
return "#version 150\n";
} else {
return "#version 150 compatibility\n";
}
case k330_GrGLSLGeneration:
if (kGLES_GrGLStandard == standard) {
return "#version 300 es\n";
} else {
SkASSERT(kGL_GrGLStandard == standard);
if (isCoreProfile) {
return "#version 330\n";
} else {
return "#version 330 compatibility\n";
}
}
case k400_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == standard);
if (isCoreProfile) {
return "#version 400\n";
} else {
return "#version 400 compatibility\n";
}
case k420_GrGLSLGeneration:
SkASSERT(kGL_GrGLStandard == standard);
if (isCoreProfile) {
return "#version 420\n";
}
else {
return "#version 420 compatibility\n";
}
case k310es_GrGLSLGeneration:
SkASSERT(kGLES_GrGLStandard == standard);
return "#version 310 es\n";
case k320es_GrGLSLGeneration:
SkASSERT(kGLES_GrGLStandard == standard);
return "#version 320 es\n";
}
return "<no version>";
}
void GrGLCaps::initGLSL(const GrGLContextInfo& ctxInfo) {
GrGLStandard standard = ctxInfo.standard();
GrGLVersion version = ctxInfo.version();
/**************************************************************************
* Caps specific to GrShaderCaps
**************************************************************************/
GrShaderCaps* shaderCaps = fShaderCaps.get();
shaderCaps->fGLSLGeneration = ctxInfo.glslGeneration();
if (kGLES_GrGLStandard == standard) {
if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
shaderCaps->fFBFetchNeedsCustomOutput = (version >= GR_GL_VER(3, 0));
shaderCaps->fFBFetchSupport = true;
shaderCaps->fFBFetchColorName = "gl_LastFragData[0]";
shaderCaps->fFBFetchExtensionString = "GL_EXT_shader_framebuffer_fetch";
}
else if (ctxInfo.hasExtension("GL_NV_shader_framebuffer_fetch")) {
// Actually, we haven't seen an ES3.0 device with this extension yet, so we don't know
shaderCaps->fFBFetchNeedsCustomOutput = false;
shaderCaps->fFBFetchSupport = true;
shaderCaps->fFBFetchColorName = "gl_LastFragData[0]";
shaderCaps->fFBFetchExtensionString = "GL_NV_shader_framebuffer_fetch";
}
else if (ctxInfo.hasExtension("GL_ARM_shader_framebuffer_fetch")) {
// The arm extension also requires an additional flag which we will set onResetContext
shaderCaps->fFBFetchNeedsCustomOutput = false;
shaderCaps->fFBFetchSupport = true;
shaderCaps->fFBFetchColorName = "gl_LastFragColorARM";
shaderCaps->fFBFetchExtensionString = "GL_ARM_shader_framebuffer_fetch";
}
shaderCaps->fUsesPrecisionModifiers = true;
}
// Currently the extension is advertised but fb fetch is broken on 500 series Adrenos like the
// Galaxy S7.
// TODO: Once this is fixed we can update the check here to look at a driver version number too.
if (kAdreno5xx_GrGLRenderer == ctxInfo.renderer()) {
shaderCaps->fFBFetchSupport = false;
}
shaderCaps->fBindlessTextureSupport = ctxInfo.hasExtension("GL_NV_bindless_texture");
if (kGL_GrGLStandard == standard) {
shaderCaps->fFlatInterpolationSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
} else {
shaderCaps->fFlatInterpolationSupport =
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // This is the value for GLSL ES 3.0.
}
if (kGL_GrGLStandard == standard) {
shaderCaps->fNoPerspectiveInterpolationSupport =
ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
} else {
if (ctxInfo.hasExtension("GL_NV_shader_noperspective_interpolation")) {
shaderCaps->fNoPerspectiveInterpolationSupport = true;
shaderCaps->fNoPerspectiveInterpolationExtensionString =
"GL_NV_shader_noperspective_interpolation";
}
}
if (kGL_GrGLStandard == standard) {
shaderCaps->fMultisampleInterpolationSupport =
ctxInfo.glslGeneration() >= k400_GrGLSLGeneration;
} else {
if (ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
shaderCaps->fMultisampleInterpolationSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_shader_multisample_interpolation")) {
shaderCaps->fMultisampleInterpolationSupport = true;
shaderCaps->fMultisampleInterpolationExtensionString =
"GL_OES_shader_multisample_interpolation";
}
}
if (kGL_GrGLStandard == standard) {
shaderCaps->fSampleVariablesSupport = ctxInfo.glslGeneration() >= k400_GrGLSLGeneration;
} else {
if (ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
shaderCaps->fSampleVariablesSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_sample_variables")) {
shaderCaps->fSampleVariablesSupport = true;
shaderCaps->fSampleVariablesExtensionString = "GL_OES_sample_variables";
}
}
if (shaderCaps->fSampleVariablesSupport &&
ctxInfo.hasExtension("GL_NV_sample_mask_override_coverage")) {
// Pre-361 NVIDIA has a bug with NV_sample_mask_override_coverage.
shaderCaps->fSampleMaskOverrideCoverageSupport =
kNVIDIA_GrGLDriver != ctxInfo.driver() ||
ctxInfo.driverVersion() >= GR_GL_DRIVER_VER(361,00);
}
// Adreno GPUs have a tendency to drop tiles when there is a divide-by-zero in a shader
shaderCaps->fDropsTileOnZeroDivide = kQualcomm_GrGLVendor == ctxInfo.vendor();
// On the NexusS and GalaxyNexus, the use of 'any' causes the compilation error "Calls to any
// function that may require a gradient calculation inside a conditional block may return
// undefined results". This appears to be an issue with the 'any' call since even the simple
// "result=black; if (any()) result=white;" code fails to compile. This issue comes into play
// from our GrTextureDomain processor.
shaderCaps->fCanUseAnyFunctionInShader = kImagination_GrGLVendor != ctxInfo.vendor();
shaderCaps->fVersionDeclString = get_glsl_version_decl_string(standard,
shaderCaps->fGLSLGeneration,
fIsCoreProfile);
if (kGLES_GrGLStandard == standard && k110_GrGLSLGeneration == shaderCaps->fGLSLGeneration) {
shaderCaps->fShaderDerivativeExtensionString = "GL_OES_standard_derivatives";
}
// Frag Coords Convention support is not part of ES
// Known issue on at least some Intel platforms:
// http://code.google.com/p/skia/issues/detail?id=946
if (kIntel_GrGLVendor != ctxInfo.vendor() &&
kGLES_GrGLStandard != standard &&
(ctxInfo.glslGeneration() >= k150_GrGLSLGeneration ||
ctxInfo.hasExtension("GL_ARB_fragment_coord_conventions"))) {
shaderCaps->fFragCoordConventionsExtensionString = "GL_ARB_fragment_coord_conventions";
}
if (kGLES_GrGLStandard == standard) {
shaderCaps->fSecondaryOutputExtensionString = "GL_EXT_blend_func_extended";
}
if (ctxInfo.hasExtension("GL_OES_EGL_image_external")) {
if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
shaderCaps->fExternalTextureSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_EGL_image_external_essl3") ||
ctxInfo.hasExtension("OES_EGL_image_external_essl3")) {
// At least one driver has been found that has this extension without the "GL_" prefix.
shaderCaps->fExternalTextureSupport = true;
}
}
if (shaderCaps->fExternalTextureSupport) {
if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
shaderCaps->fExternalTextureExtensionString = "GL_OES_EGL_image_external";
} else {
shaderCaps->fExternalTextureExtensionString = "GL_OES_EGL_image_external_essl3";
}
}
if (kGL_GrGLStandard == standard) {
shaderCaps->fTexelFetchSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
} else {
shaderCaps->fTexelFetchSupport =
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
}
if (shaderCaps->fTexelFetchSupport) {
if (kGL_GrGLStandard == standard) {
shaderCaps->fTexelBufferSupport = ctxInfo.version() >= GR_GL_VER(3, 1) &&
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration;
} else {
if (ctxInfo.version() >= GR_GL_VER(3, 2) &&
ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
shaderCaps->fTexelBufferSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_texture_buffer")) {
shaderCaps->fTexelBufferSupport = true;
shaderCaps->fTexelBufferExtensionString = "GL_OES_texture_buffer";
} else if (ctxInfo.hasExtension("GL_EXT_texture_buffer")) {
shaderCaps->fTexelBufferSupport = true;
shaderCaps->fTexelBufferExtensionString = "GL_EXT_texture_buffer";
}
}
}
if (kGL_GrGLStandard == standard) {
shaderCaps->fVertexIDSupport = true;
} else {
// Desktop GLSL 3.30 == ES GLSL 3.00.
shaderCaps->fVertexIDSupport = ctxInfo.glslGeneration() >= k330_GrGLSLGeneration;
}
if (kTegra3_GrGLRenderer == ctxInfo.renderer()) {
// The Tegra3 compiler will sometimes never return if we have min(abs(x), 1.0),
// so we must do the abs first in a separate expression.
shaderCaps->fCanUseMinAndAbsTogether = false;
// Tegra3 fract() seems to trigger undefined behavior for negative values, so we
// must avoid this condition.
shaderCaps->fCanUseFractForNegativeValues = false;
}
// On Intel GPU there is an issue where it reads the second argument to atan "- %s.x" as an int
// thus must us -1.0 * %s.x to work correctly
if (kIntel_GrGLVendor == ctxInfo.vendor()) {
shaderCaps->fMustForceNegatedAtanParamToFloat = true;
}
// On Adreno devices with framebuffer fetch support, there is a bug where they always return
// the original dst color when reading the outColor even after being written to. By using a
// local outColor we can work around this bug.
if (shaderCaps->fFBFetchSupport && kQualcomm_GrGLVendor == ctxInfo.vendor()) {
shaderCaps->fRequiresLocalOutputColorForFBFetch = true;
}
#ifdef SK_BUILD_FOR_MAC
// On at least some MacBooks, geometry shaders fall apart if we use more than one invocation. To
// work around this, we always use a single invocation and wrap the shader in a loop. The long-
// term plan for this WAR is for it to eventually be baked into SkSL.
shaderCaps->fMustImplementGSInvocationsWithLoop = true;
#endif
// Newer Mali GPUs do incorrect static analysis in specific situations: If there is uniform
// color, and that uniform contains an opaque color, and the output of the shader is only based
// on that uniform plus soemthing un-trackable (like a texture read), the compiler will deduce
// that the shader always outputs opaque values. In that case, it appears to remove the shader
// based blending code it normally injects, turning SrcOver into Src. To fix this, we always
// insert an extra bit of math on the uniform that confuses the compiler just enough...
if (kMaliT_GrGLRenderer == ctxInfo.renderer()) {
shaderCaps->fMustObfuscateUniformColor = true;
}
#ifdef SK_BUILD_FOR_WIN
// Check for ANGLE on Windows, so we can workaround a bug in D3D itself (anglebug.com/2098).
//
// Basically, if a shader has a construct like:
//
// float x = someCondition ? someValue : 0;
// float2 result = (0 == x) ? float2(x, x)
// : float2(2 * x / x, 0);
//
// ... the compiler will produce an error 'NaN and infinity literals not allowed', even though
// we've explicitly guarded the division with a check against zero. This manifests in much
// more complex ways in some of our shaders, so we use this caps bit to add an epsilon value
// to the denominator of divisions, even when we've added checks that the denominator isn't 0.
if (kANGLE_GrGLDriver == ctxInfo.driver() || kChromium_GrGLDriver == ctxInfo.driver()) {
shaderCaps->fMustGuardDivisionEvenAfterExplicitZeroCheck = true;
}
#endif
}
bool GrGLCaps::hasPathRenderingSupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
bool hasChromiumPathRendering = ctxInfo.hasExtension("GL_CHROMIUM_path_rendering");
if (!(ctxInfo.hasExtension("GL_NV_path_rendering") || hasChromiumPathRendering)) {
return false;
}
if (kGL_GrGLStandard == ctxInfo.standard()) {
if (ctxInfo.version() < GR_GL_VER(4, 3) &&
!ctxInfo.hasExtension("GL_ARB_program_interface_query")) {
return false;
}
} else {
if (!hasChromiumPathRendering &&
ctxInfo.version() < GR_GL_VER(3, 1)) {
return false;
}
}
// We only support v1.3+ of GL_NV_path_rendering which allows us to
// set individual fragment inputs with ProgramPathFragmentInputGen. The API
// additions are detected by checking the existence of the function.
// We also use *Then* functions that not all drivers might have. Check
// them for consistency.
if (!gli->fFunctions.fStencilThenCoverFillPath ||
!gli->fFunctions.fStencilThenCoverStrokePath ||
!gli->fFunctions.fStencilThenCoverFillPathInstanced ||
!gli->fFunctions.fStencilThenCoverStrokePathInstanced ||
!gli->fFunctions.fProgramPathFragmentInputGen) {
return false;
}
return true;
}
bool GrGLCaps::readPixelsSupported(GrPixelConfig surfaceConfig,
GrPixelConfig readConfig,
std::function<void (GrGLenum, GrGLint*)> getIntegerv,
std::function<bool ()> bindRenderTarget,
std::function<void ()> unbindRenderTarget) const {
// If it's not possible to even have a color attachment of surfaceConfig then read pixels is
// not supported regardless of readConfig.
if (!this->canConfigBeFBOColorAttachment(surfaceConfig)) {
return false;
}
if (GrPixelConfigIsSint(surfaceConfig) != GrPixelConfigIsSint(readConfig)) {
return false;
}
GrGLenum readFormat;
GrGLenum readType;
if (!this->getReadPixelsFormat(surfaceConfig, readConfig, &readFormat, &readType)) {
return false;
}
if (kGL_GrGLStandard == fStandard) {
// Some OpenGL implementations allow GL_ALPHA as a format to glReadPixels. However,
// the manual (https://www.opengl.org/sdk/docs/man/) says only these formats are allowed:
// GL_STENCIL_INDEX, GL_DEPTH_COMPONENT, GL_DEPTH_STENCIL, GL_RED, GL_GREEN, GL_BLUE,
// GL_RGB, GL_BGR, GL_RGBA, and GL_BGRA. We check for the subset that we would use.
// The manual does not seem to fully match the spec as the spec allows integer formats
// when the bound color buffer is an integer buffer. It doesn't specify which integer
// formats are allowed, so perhaps all of them are. We only use GL_RGBA_INTEGER currently.
if (readFormat != GR_GL_RED && readFormat != GR_GL_RG && readFormat != GR_GL_RGB &&
readFormat != GR_GL_RGBA && readFormat != GR_GL_BGRA &&
readFormat != GR_GL_RGBA_INTEGER) {
return false;
}
// There is also a set of allowed types, but all the types we use are in the set:
// GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT,
// GL_HALF_FLOAT, GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV,
// GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4,
// GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV,
// GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV,GL_UNSIGNED_INT_10_10_10_2,
// GL_UNSIGNED_INT_2_10_10_10_REV, GL_UNSIGNED_INT_24_8, GL_UNSIGNED_INT_10F_11F_11F_REV,
// GL_UNSIGNED_INT_5_9_9_9_REV, or GL_FLOAT_32_UNSIGNED_INT_24_8_REV.
return true;
}
// See Section 16.1.2 in the ES 3.2 specification.
switch (fConfigTable[surfaceConfig].fFormatType) {
case kNormalizedFixedPoint_FormatType:
if (GR_GL_RGBA == readFormat && GR_GL_UNSIGNED_BYTE == readType) {
return true;
}
break;
case kInteger_FormatType:
if (GR_GL_RGBA_INTEGER == readFormat && GR_GL_INT == readType) {
return true;
}
break;
case kFloat_FormatType:
if (GR_GL_RGBA == readFormat && GR_GL_FLOAT == readType) {
return true;
}
break;
}
if (0 == fConfigTable[surfaceConfig].fSecondReadPixelsFormat.fFormat) {
ReadPixelsFormat* rpFormat =
const_cast<ReadPixelsFormat*>(&fConfigTable[surfaceConfig].fSecondReadPixelsFormat);
GrGLint format = 0, type = 0;
if (!bindRenderTarget()) {
return false;
}
getIntegerv(GR_GL_IMPLEMENTATION_COLOR_READ_FORMAT, &format);
getIntegerv(GR_GL_IMPLEMENTATION_COLOR_READ_TYPE, &type);
rpFormat->fFormat = format;
rpFormat->fType = type;
unbindRenderTarget();
}
return fConfigTable[surfaceConfig].fSecondReadPixelsFormat.fFormat == readFormat &&
fConfigTable[surfaceConfig].fSecondReadPixelsFormat.fType == readType;
}
void GrGLCaps::initFSAASupport(const GrContextOptions& contextOptions, const GrGLContextInfo& ctxInfo,
const GrGLInterface* gli) {
// We need dual source blending and the ability to disable multisample in order to support mixed
// samples in every corner case. We only use mixed samples if the stencil-and-cover path
// renderer is available and enabled; no other path renderers support this feature.
if (fMultisampleDisableSupport &&
this->shaderCaps()->dualSourceBlendingSupport() &&
this->shaderCaps()->pathRenderingSupport() &&
(contextOptions.fGpuPathRenderers & GrContextOptions::GpuPathRenderers::kStencilAndCover)) {
fUsesMixedSamples = ctxInfo.hasExtension("GL_NV_framebuffer_mixed_samples") ||
ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_mixed_samples");
// Workaround NVIDIA bug related to glInvalidateFramebuffer and mixed samples.
if (fUsesMixedSamples && (kNVIDIA_GrGLDriver == ctxInfo.driver() ||
kChromium_GrGLDriver == ctxInfo.driver())) {
fDiscardRenderTargetSupport = false;
fInvalidateFBType = kNone_InvalidateFBType;
}
}
if (kGL_GrGLStandard != ctxInfo.standard()) {
// We prefer the EXT/IMG extension over ES3 MSAA because we've observed
// ES3 driver bugs on at least one device with a tiled GPU (N10).
if (ctxInfo.hasExtension("GL_EXT_multisampled_render_to_texture")) {
fMSFBOType = kES_EXT_MsToTexture_MSFBOType;
} else if (ctxInfo.hasExtension("GL_IMG_multisampled_render_to_texture")) {
fMSFBOType = kES_IMG_MsToTexture_MSFBOType;
} else if (fUsesMixedSamples) {
fMSFBOType = kMixedSamples_MSFBOType;
} else if (ctxInfo.version() >= GR_GL_VER(3,0)) {
fMSFBOType = kStandard_MSFBOType;
fAlpha8IsRenderable = true;
} else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
fMSFBOType = kStandard_MSFBOType;
} else if (ctxInfo.hasExtension("GL_ANGLE_framebuffer_multisample")) {
fMSFBOType = kStandard_MSFBOType;
} else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
fMSFBOType = kES_Apple_MSFBOType;
}
} else {
if (fUsesMixedSamples) {
fMSFBOType = kMixedSamples_MSFBOType;
} else if (ctxInfo.version() >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
fMSFBOType = kStandard_MSFBOType;
if (!fIsCoreProfile && ctxInfo.renderer() != kOSMesa_GrGLRenderer) {
// Core profile removes ALPHA8 support.
// OpenGL 3.0+ (and GL_ARB_framebuffer_object) supports ALPHA8 as renderable.
// However, osmesa fails if it is used even when GL_ARB_framebuffer_object is
// present.
fAlpha8IsRenderable = true;
}
} else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
fMSFBOType = kStandard_MSFBOType;
}
}
// We disable MSAA across the board for Intel GPUs
if (kIntel_GrGLVendor == ctxInfo.vendor()) {
fMSFBOType = kNone_MSFBOType;
}
if (GrGLCaps::kES_IMG_MsToTexture_MSFBOType == fMSFBOType) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES_IMG, &fMaxStencilSampleCount);
} else if (GrGLCaps::kNone_MSFBOType != fMSFBOType) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_SAMPLES, &fMaxStencilSampleCount);
}
// We only have a use for raster multisample if there is coverage modulation from mixed samples.
if (fUsesMixedSamples && ctxInfo.hasExtension("GL_EXT_raster_multisample")) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_RASTER_SAMPLES, &fMaxRasterSamples);
// This is to guard against platforms that may not support as many samples for
// glRasterSamples as they do for framebuffers.
fMaxStencilSampleCount = SkTMin(fMaxStencilSampleCount, fMaxRasterSamples);
}
fMaxColorSampleCount = fMaxStencilSampleCount;
}
void GrGLCaps::initBlendEqationSupport(const GrGLContextInfo& ctxInfo) {
GrShaderCaps* shaderCaps = static_cast<GrShaderCaps*>(fShaderCaps.get());
// Disabling advanced blend on various platforms with major known issues. We also block Chrome
// for now until its own blacklists can be updated.
if (kAdreno4xx_GrGLRenderer == ctxInfo.renderer() ||
kAdreno5xx_GrGLRenderer == ctxInfo.renderer() ||
kIntel_GrGLDriver == ctxInfo.driver() ||
kChromium_GrGLDriver == ctxInfo.driver()) {
return;
}
if (ctxInfo.hasExtension("GL_NV_blend_equation_advanced_coherent")) {
fBlendEquationSupport = kAdvancedCoherent_BlendEquationSupport;
shaderCaps->fAdvBlendEqInteraction = GrShaderCaps::kAutomatic_AdvBlendEqInteraction;
} else if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced_coherent")) {
fBlendEquationSupport = kAdvancedCoherent_BlendEquationSupport;
shaderCaps->fAdvBlendEqInteraction = GrShaderCaps::kGeneralEnable_AdvBlendEqInteraction;
} else if (kNVIDIA_GrGLDriver == ctxInfo.driver() &&
ctxInfo.driverVersion() < GR_GL_DRIVER_VER(337,00)) {
// Non-coherent advanced blend has an issue on NVIDIA pre 337.00.
return;
} else if (ctxInfo.hasExtension("GL_NV_blend_equation_advanced")) {
fBlendEquationSupport = kAdvanced_BlendEquationSupport;
shaderCaps->fAdvBlendEqInteraction = GrShaderCaps::kAutomatic_AdvBlendEqInteraction;
} else if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced")) {
fBlendEquationSupport = kAdvanced_BlendEquationSupport;
shaderCaps->fAdvBlendEqInteraction = GrShaderCaps::kGeneralEnable_AdvBlendEqInteraction;
// TODO: Use kSpecificEnables_AdvBlendEqInteraction if "blend_support_all_equations" is
// slow on a particular platform.
} else {
return; // No advanced blend support.
}
SkASSERT(this->advancedBlendEquationSupport());
if (kNVIDIA_GrGLDriver == ctxInfo.driver() &&
ctxInfo.driverVersion() < GR_GL_DRIVER_VER(355,00)) {
// Blacklist color-dodge and color-burn on pre-355.00 NVIDIA.
fAdvBlendEqBlacklist |= (1 << kColorDodge_GrBlendEquation) |
(1 << kColorBurn_GrBlendEquation);
}
if (kARM_GrGLVendor == ctxInfo.vendor()) {
// Blacklist color-burn on ARM until the fix is released.
fAdvBlendEqBlacklist |= (1 << kColorBurn_GrBlendEquation);
}
}
namespace {
const GrGLuint kUnknownBitCount = GrGLStencilAttachment::kUnknownBitCount;
}
void GrGLCaps::initStencilSupport(const GrGLContextInfo& ctxInfo) {
// Build up list of legal stencil formats (though perhaps not supported on
// the particular gpu/driver) from most preferred to least.
// these consts are in order of most preferred to least preferred
// we don't bother with GL_STENCIL_INDEX1 or GL_DEPTH32F_STENCIL8
static const StencilFormat
// internal Format stencil bits total bits packed?
gS8 = {GR_GL_STENCIL_INDEX8, 8, 8, false},
gS16 = {GR_GL_STENCIL_INDEX16, 16, 16, false},
gD24S8 = {GR_GL_DEPTH24_STENCIL8, 8, 32, true },
gS4 = {GR_GL_STENCIL_INDEX4, 4, 4, false},
// gS = {GR_GL_STENCIL_INDEX, kUnknownBitCount, kUnknownBitCount, false},
gDS = {GR_GL_DEPTH_STENCIL, kUnknownBitCount, kUnknownBitCount, true };
if (kGL_GrGLStandard == ctxInfo.standard()) {
bool supportsPackedDS =
ctxInfo.version() >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_EXT_packed_depth_stencil") ||
ctxInfo.hasExtension("GL_ARB_framebuffer_object");
// S1 thru S16 formats are in GL 3.0+, EXT_FBO, and ARB_FBO since we
// require FBO support we can expect these are legal formats and don't
// check. These also all support the unsized GL_STENCIL_INDEX.
fStencilFormats.push_back() = gS8;
fStencilFormats.push_back() = gS16;
if (supportsPackedDS) {
fStencilFormats.push_back() = gD24S8;
}
fStencilFormats.push_back() = gS4;
if (supportsPackedDS) {
fStencilFormats.push_back() = gDS;
}
} else {
// ES2 has STENCIL_INDEX8 without extensions but requires extensions
// for other formats.
// ES doesn't support using the unsized format.
fStencilFormats.push_back() = gS8;
//fStencilFormats.push_back() = gS16;
if (ctxInfo.version() >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_OES_packed_depth_stencil")) {
fStencilFormats.push_back() = gD24S8;
}
if (ctxInfo.hasExtension("GL_OES_stencil4")) {
fStencilFormats.push_back() = gS4;
}
}
}
void GrGLCaps::onDumpJSON(SkJSONWriter* writer) const {
// We are called by the base class, which has already called beginObject(). We choose to nest
// all of our caps information in a named sub-object.
writer->beginObject("GL caps");
writer->beginArray("Stencil Formats");
for (int i = 0; i < fStencilFormats.count(); ++i) {
writer->beginObject(nullptr, false);
writer->appendS32("stencil bits", fStencilFormats[i].fStencilBits);
writer->appendS32("total bits", fStencilFormats[i].fTotalBits);
writer->endObject();
}
writer->endArray();
static const char* kMSFBOExtStr[] = {
"None",
"Standard",
"Apple",
"IMG MS To Texture",
"EXT MS To Texture",
"MixedSamples",
};
GR_STATIC_ASSERT(0 == kNone_MSFBOType);
GR_STATIC_ASSERT(1 == kStandard_MSFBOType);
GR_STATIC_ASSERT(2 == kES_Apple_MSFBOType);
GR_STATIC_ASSERT(3 == kES_IMG_MsToTexture_MSFBOType);
GR_STATIC_ASSERT(4 == kES_EXT_MsToTexture_MSFBOType);
GR_STATIC_ASSERT(5 == kMixedSamples_MSFBOType);
GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMSFBOExtStr) == kLast_MSFBOType + 1);
static const char* kInvalidateFBTypeStr[] = {
"None",
"Discard",
"Invalidate",
};
GR_STATIC_ASSERT(0 == kNone_InvalidateFBType);
GR_STATIC_ASSERT(1 == kDiscard_InvalidateFBType);
GR_STATIC_ASSERT(2 == kInvalidate_InvalidateFBType);
GR_STATIC_ASSERT(SK_ARRAY_COUNT(kInvalidateFBTypeStr) == kLast_InvalidateFBType + 1);
static const char* kMapBufferTypeStr[] = {
"None",
"MapBuffer",
"MapBufferRange",
"Chromium",
};
GR_STATIC_ASSERT(0 == kNone_MapBufferType);
GR_STATIC_ASSERT(1 == kMapBuffer_MapBufferType);
GR_STATIC_ASSERT(2 == kMapBufferRange_MapBufferType);
GR_STATIC_ASSERT(3 == kChromium_MapBufferType);
GR_STATIC_ASSERT(SK_ARRAY_COUNT(kMapBufferTypeStr) == kLast_MapBufferType + 1);
writer->appendBool("Core Profile", fIsCoreProfile);
writer->appendString("MSAA Type", kMSFBOExtStr[fMSFBOType]);
writer->appendString("Invalidate FB Type", kInvalidateFBTypeStr[fInvalidateFBType]);
writer->appendString("Map Buffer Type", kMapBufferTypeStr[fMapBufferType]);
writer->appendS32("Max FS Uniform Vectors", fMaxFragmentUniformVectors);
writer->appendBool("Unpack Row length support", fUnpackRowLengthSupport);
writer->appendBool("Unpack Flip Y support", fUnpackFlipYSupport);
writer->appendBool("Pack Row length support", fPackRowLengthSupport);
writer->appendBool("Pack Flip Y support", fPackFlipYSupport);
writer->appendBool("Texture Usage support", fTextureUsageSupport);
writer->appendBool("GL_R support", fTextureRedSupport);
writer->appendBool("Alpha8 is renderable", fAlpha8IsRenderable);
writer->appendBool("GL_ARB_imaging support", fImagingSupport);
writer->appendBool("Vertex array object support", fVertexArrayObjectSupport);
writer->appendBool("Direct state access support", fDirectStateAccessSupport);
writer->appendBool("Debug support", fDebugSupport);
writer->appendBool("Draw indirect support", fDrawIndirectSupport);
writer->appendBool("Multi draw indirect support", fMultiDrawIndirectSupport);
writer->appendBool("Base instance support", fBaseInstanceSupport);
writer->appendBool("RGBA 8888 pixel ops are slow", fRGBA8888PixelsOpsAreSlow);
writer->appendBool("Partial FBO read is slow", fPartialFBOReadIsSlow);
writer->appendBool("Bind uniform location support", fBindUniformLocationSupport);
writer->appendBool("Rectangle texture support", fRectangleTextureSupport);
writer->appendBool("Texture swizzle support", fTextureSwizzleSupport);
writer->appendBool("BGRA to RGBA readback conversions are slow",
fRGBAToBGRAReadbackConversionsAreSlow);
writer->appendBool("Intermediate texture for partial updates of unorm textures ever bound to FBOs",
fDisallowTexSubImageForUnormConfigTexturesEverBoundToFBO);
writer->appendBool("Intermediate texture for all updates of textures bound to FBOs",
fUseDrawInsteadOfAllRenderTargetWrites);
writer->beginArray("configs");
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
writer->beginObject(nullptr, false);
writer->appendHexU32("flags", fConfigTable[i].fFlags);
writer->appendHexU32("b_internal", fConfigTable[i].fFormats.fBaseInternalFormat);
writer->appendHexU32("s_internal", fConfigTable[i].fFormats.fSizedInternalFormat);
writer->appendHexU32("e_format",
fConfigTable[i].fFormats.fExternalFormat[kOther_ExternalFormatUsage]);
writer->appendHexU32(
"e_format_teximage",
fConfigTable[i].fFormats.fExternalFormat[kTexImage_ExternalFormatUsage]);
writer->appendHexU32("e_type", fConfigTable[i].fFormats.fExternalType);
writer->appendHexU32("i_for_teximage", fConfigTable[i].fFormats.fInternalFormatTexImage);
writer->appendHexU32("i_for_renderbuffer",
fConfigTable[i].fFormats.fInternalFormatRenderbuffer);
writer->endObject();
}
writer->endArray();
writer->endObject();
}
static GrGLenum precision_to_gl_float_type(GrSLPrecision p) {
switch (p) {
case kLow_GrSLPrecision:
return GR_GL_LOW_FLOAT;
case kMedium_GrSLPrecision:
return GR_GL_MEDIUM_FLOAT;
case kHigh_GrSLPrecision:
return GR_GL_HIGH_FLOAT;
default:
SK_ABORT("Unexpected precision type.");
return -1;
}
}
static GrGLenum shader_type_to_gl_shader(GrShaderType type) {
switch (type) {
case kVertex_GrShaderType:
return GR_GL_VERTEX_SHADER;
case kGeometry_GrShaderType:
return GR_GL_GEOMETRY_SHADER;
case kFragment_GrShaderType:
return GR_GL_FRAGMENT_SHADER;
}
SK_ABORT("Unknown shader type.");
return -1;
}
void GrGLCaps::initShaderPrecisionTable(const GrGLContextInfo& ctxInfo,
const GrGLInterface* intf,
GrShaderCaps* shaderCaps) {
if (kGLES_GrGLStandard == ctxInfo.standard() || ctxInfo.version() >= GR_GL_VER(4, 1) ||
ctxInfo.hasExtension("GL_ARB_ES2_compatibility")) {
for (int s = 0; s < kGrShaderTypeCount; ++s) {
if (kGeometry_GrShaderType != s) {
GrShaderType shaderType = static_cast<GrShaderType>(s);
GrGLenum glShader = shader_type_to_gl_shader(shaderType);
GrShaderCaps::PrecisionInfo* first = nullptr;
shaderCaps->fShaderPrecisionVaries = false;
for (int p = 0; p < kGrSLPrecisionCount; ++p) {
GrSLPrecision precision = static_cast<GrSLPrecision>(p);
GrGLenum glPrecision = precision_to_gl_float_type(precision);
GrGLint range[2];
GrGLint bits;
GR_GL_GetShaderPrecisionFormat(intf, glShader, glPrecision, range, &bits);
if (bits) {
shaderCaps->fFloatPrecisions[s][p].fLogRangeLow = range[0];
shaderCaps->fFloatPrecisions[s][p].fLogRangeHigh = range[1];
shaderCaps->fFloatPrecisions[s][p].fBits = bits;
if (!first) {
first = &shaderCaps->fFloatPrecisions[s][p];
}
else if (!shaderCaps->fShaderPrecisionVaries) {
shaderCaps->fShaderPrecisionVaries =
(*first != shaderCaps->fFloatPrecisions[s][p]);
}
}
}
}
}
}
else {
// We're on a desktop GL that doesn't have precision info. Assume they're all 32bit float.
shaderCaps->fShaderPrecisionVaries = false;
for (int s = 0; s < kGrShaderTypeCount; ++s) {
if (kGeometry_GrShaderType != s) {
for (int p = 0; p < kGrSLPrecisionCount; ++p) {
shaderCaps->fFloatPrecisions[s][p].fLogRangeLow = 127;
shaderCaps->fFloatPrecisions[s][p].fLogRangeHigh = 127;
shaderCaps->fFloatPrecisions[s][p].fBits = 23;
}
}
}
}
// GetShaderPrecisionFormat doesn't accept GL_GEOMETRY_SHADER as a shader type. Assume they're
// the same as the vertex shader. Only fragment shaders were ever allowed to omit support for
// highp. GS was added after GetShaderPrecisionFormat was added to the list of features that
// are recommended against.
if (shaderCaps->fGeometryShaderSupport) {
for (int p = 0; p < kGrSLPrecisionCount; ++p) {
shaderCaps->fFloatPrecisions[kGeometry_GrShaderType][p] =
shaderCaps->fFloatPrecisions[kVertex_GrShaderType][p];
}
}
shaderCaps->initSamplerPrecisionTable();
}
bool GrGLCaps::bgraIsInternalFormat() const {
return fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat == GR_GL_BGRA;
}
bool GrGLCaps::getTexImageFormats(GrPixelConfig surfaceConfig, GrPixelConfig externalConfig,
GrGLenum* internalFormat, GrGLenum* externalFormat,
GrGLenum* externalType) const {
if (!this->getExternalFormat(surfaceConfig, externalConfig, kTexImage_ExternalFormatUsage,
externalFormat, externalType)) {
return false;
}
*internalFormat = fConfigTable[surfaceConfig].fFormats.fInternalFormatTexImage;
return true;
}
bool GrGLCaps::getReadPixelsFormat(GrPixelConfig surfaceConfig, GrPixelConfig externalConfig,
GrGLenum* externalFormat, GrGLenum* externalType) const {
if (!this->getExternalFormat(surfaceConfig, externalConfig, kOther_ExternalFormatUsage,
externalFormat, externalType)) {
return false;
}
return true;
}
bool GrGLCaps::getRenderbufferFormat(GrPixelConfig config, GrGLenum* internalFormat) const {
*internalFormat = fConfigTable[config].fFormats.fInternalFormatRenderbuffer;
return true;
}
bool GrGLCaps::getExternalFormat(GrPixelConfig surfaceConfig, GrPixelConfig memoryConfig,
ExternalFormatUsage usage, GrGLenum* externalFormat,
GrGLenum* externalType) const {
SkASSERT(externalFormat && externalType);
bool surfaceIsAlphaOnly = GrPixelConfigIsAlphaOnly(surfaceConfig);
bool memoryIsAlphaOnly = GrPixelConfigIsAlphaOnly(memoryConfig);
// We don't currently support moving RGBA data into and out of ALPHA surfaces. It could be
// made to work in many cases using glPixelStore and what not but is not needed currently.
if (surfaceIsAlphaOnly && !memoryIsAlphaOnly) {
return false;
}
*externalFormat = fConfigTable[memoryConfig].fFormats.fExternalFormat[usage];
*externalType = fConfigTable[memoryConfig].fFormats.fExternalType;
// When GL_RED is supported as a texture format, our alpha-only textures are stored using
// GL_RED and we swizzle in order to map all components to 'r'. However, in this case the
// surface is not alpha-only and we want alpha to really mean the alpha component of the
// texture, not the red component.
if (memoryIsAlphaOnly && !surfaceIsAlphaOnly) {
if (this->textureRedSupport()) {
SkASSERT(GR_GL_RED == *externalFormat);
*externalFormat = GR_GL_ALPHA;
}
}
return true;
}
void GrGLCaps::initConfigTable(const GrContextOptions& contextOptions,
const GrGLContextInfo& ctxInfo, const GrGLInterface* gli,
GrShaderCaps* shaderCaps) {
/*
Comments on renderability of configs on various GL versions.
OpenGL < 3.0:
no built in support for render targets.
GL_EXT_framebuffer_object adds possible support for any sized format with base internal
format RGB, RGBA and NV float formats we don't use.
This is the following:
R3_G3_B2, RGB4, RGB5, RGB8, RGB10, RGB12, RGB16, RGBA2, RGBA4, RGB5_A1, RGBA8
RGB10_A2, RGBA12,RGBA16
Though, it is hard to believe the more obscure formats such as RGBA12 would work
since they aren't required by later standards and the driver can simply return
FRAMEBUFFER_UNSUPPORTED for anything it doesn't allow.
GL_ARB_framebuffer_object adds everything added by the EXT extension and additionally
any sized internal format with a base internal format of ALPHA, LUMINANCE,
LUMINANCE_ALPHA, INTENSITY, RED, and RG.
This adds a lot of additional renderable sized formats, including ALPHA8.
The GL_ARB_texture_rg brings in the RED and RG formats (8, 8I, 8UI, 16, 16I, 16UI,
16F, 32I, 32UI, and 32F variants).
Again, the driver has an escape hatch via FRAMEBUFFER_UNSUPPORTED.
For both the above extensions we limit ourselves to those that are also required by
OpenGL 3.0.
OpenGL 3.0:
Any format with base internal format ALPHA, RED, RG, RGB or RGBA is "color-renderable"
but are not required to be supported as renderable textures/renderbuffer.
Required renderable color formats:
- RGBA32F, RGBA32I, RGBA32UI, RGBA16, RGBA16F, RGBA16I,
RGBA16UI, RGBA8, RGBA8I, RGBA8UI, SRGB8_ALPHA8, and
RGB10_A2.
- R11F_G11F_B10F.
- RG32F, RG32I, RG32UI, RG16, RG16F, RG16I, RG16UI, RG8, RG8I,
and RG8UI.
- R32F, R32I, R32UI, R16F, R16I, R16UI, R16, R8, R8I, and R8UI.
- ALPHA8
OpenGL 3.1, 3.2, 3.3
Same as 3.0 except ALPHA8 requires GL_ARB_compatibility/compatibility profile.
OpengGL 3.3, 4.0, 4.1
Adds RGB10_A2UI.
OpengGL 4.2
Adds
- RGB5_A1, RGBA4
- RGB565
OpenGL 4.4
Does away with the separate list and adds a column to the sized internal color format
table. However, no new formats become required color renderable.
ES 2.0
color renderable: RGBA4, RGB5_A1, RGB565
GL_EXT_texture_rg adds support for R8, RG5 as a color render target
GL_OES_rgb8_rgba8 adds support for RGB8 and RGBA8
GL_ARM_rgba8 adds support for RGBA8 (but not RGB8)
GL_EXT_texture_format_BGRA8888 does not add renderbuffer support
GL_CHROMIUM_renderbuffer_format_BGRA8888 adds BGRA8 as color-renderable
GL_APPLE_texture_format_BGRA8888 does not add renderbuffer support
ES 3.0
- RGBA32I, RGBA32UI, RGBA16I, RGBA16UI, RGBA8, RGBA8I,
RGBA8UI, SRGB8_ALPHA8, RGB10_A2, RGB10_A2UI, RGBA4, and
RGB5_A1.
- RGB8 and RGB565.
- RG32I, RG32UI, RG16I, RG16UI, RG8, RG8I, and RG8UI.
- R32I, R32UI, R16I, R16UI, R8, R8I, and R8UI
ES 3.1
Adds RGB10_A2, RGB10_A2UI,
ES 3.2
Adds R16F, RG16F, RGBA16F, R32F, RG32F, RGBA32F, R11F_G11F_B10F.
*/
uint32_t nonMSAARenderFlags = ConfigInfo::kRenderable_Flag |
ConfigInfo::kFBOColorAttachment_Flag;
uint32_t allRenderFlags = nonMSAARenderFlags;
if (kNone_MSFBOType != fMSFBOType) {
allRenderFlags |= ConfigInfo::kRenderableWithMSAA_Flag;
}
GrGLStandard standard = ctxInfo.standard();
GrGLVersion version = ctxInfo.version();
bool texStorageSupported = false;
if (kGL_GrGLStandard == standard) {
// The EXT version can apply to either GL or GLES.
texStorageSupported = version >= GR_GL_VER(4,2) ||
ctxInfo.hasExtension("GL_ARB_texture_storage") ||
ctxInfo.hasExtension("GL_EXT_texture_storage");
} else {
texStorageSupported = version >= GR_GL_VER(3,0) ||
ctxInfo.hasExtension("GL_EXT_texture_storage");
}
// TODO: remove after command buffer supports full ES 3.0
if (kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0) &&
kChromium_GrGLDriver == ctxInfo.driver()) {
texStorageSupported = false;
}
bool texelBufferSupport = this->shaderCaps()->texelBufferSupport();
fConfigTable[kUnknown_GrPixelConfig].fFormats.fBaseInternalFormat = 0;
fConfigTable[kUnknown_GrPixelConfig].fFormats.fSizedInternalFormat = 0;
fConfigTable[kUnknown_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = 0;
fConfigTable[kUnknown_GrPixelConfig].fFormats.fExternalType = 0;
fConfigTable[kUnknown_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kUnknown_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA8;
fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RGBA;
fConfigTable[kRGBA_8888_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
fConfigTable[kRGBA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kRGBA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
if (kGL_GrGLStandard == standard) {
// We require some form of FBO support and all GLs with FBO support can render to RGBA8
fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= allRenderFlags;
} else {
if (version >= GR_GL_VER(3,0) || ctxInfo.hasExtension("GL_OES_rgb8_rgba8") ||
ctxInfo.hasExtension("GL_ARM_rgba8")) {
fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= allRenderFlags;
}
}
if (texStorageSupported) {
fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
if (texelBufferSupport) {
fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
}
fConfigTable[kRGBA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_BGRA;
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
fConfigTable[kBGRA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
if (kGL_GrGLStandard == standard) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA8;
if (version >= GR_GL_VER(1, 2) || ctxInfo.hasExtension("GL_EXT_bgra")) {
// Since the internal format is RGBA8, it is also renderable.
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
allRenderFlags;
}
} else {
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_BGRA;
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_BGRA8;
if (ctxInfo.hasExtension("GL_APPLE_texture_format_BGRA8888")) {
// This APPLE extension introduces complexity on ES2. It leaves the internal format
// as RGBA, but allows BGRA as the external format. From testing, it appears that the
// driver remembers the external format when the texture is created (with TexImage).
// If you then try to upload data in the other swizzle (with TexSubImage), it fails.
// We could work around this, but it adds even more state tracking to code that is
// already too tricky. Instead, we opt not to support BGRA on ES2 with this extension.
// This also side-steps some ambiguous interactions with the texture storage extension.
if (version >= GR_GL_VER(3,0)) {
// The APPLE extension doesn't make this renderable.
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
}
} else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
nonMSAARenderFlags;
if (ctxInfo.hasExtension("GL_CHROMIUM_renderbuffer_format_BGRA8888") &&
(this->usesMSAARenderBuffers() || this->fMSFBOType == kMixedSamples_MSFBOType)) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags |=
ConfigInfo::kRenderableWithMSAA_Flag;
}
}
}
bool isX86PowerVR = false;
#if defined(SK_CPU_X86)
if (kPowerVRRogue_GrGLRenderer == ctxInfo.renderer()) {
isX86PowerVR = true;
}
#endif
// Adreno 3xx, 4xx, 5xx, and NexusPlayer all fail if we try to use TexStorage with BGRA
if (texStorageSupported &&
kAdreno3xx_GrGLRenderer != ctxInfo.renderer() &&
kAdreno4xx_GrGLRenderer != ctxInfo.renderer() &&
kAdreno5xx_GrGLRenderer != ctxInfo.renderer() &&
!isX86PowerVR) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kBGRA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
// We only enable srgb support if both textures and FBOs support srgb,
// *and* we can disable sRGB decode-on-read, to support "legacy" mode.
if (kGL_GrGLStandard == standard) {
if (ctxInfo.version() >= GR_GL_VER(3,0)) {
fSRGBSupport = true;
} else if (ctxInfo.hasExtension("GL_EXT_texture_sRGB")) {
if (ctxInfo.hasExtension("GL_ARB_framebuffer_sRGB") ||
ctxInfo.hasExtension("GL_EXT_framebuffer_sRGB")) {
fSRGBSupport = true;
}
}
// All the above srgb extensions support toggling srgb writes
if (fSRGBSupport) {
fSRGBWriteControl = true;
}
} else {
fSRGBSupport = ctxInfo.version() >= GR_GL_VER(3,0) || ctxInfo.hasExtension("GL_EXT_sRGB");
// NexusPlayer has strange bugs with sRGB (skbug.com/4148). This is a targeted fix to
// blacklist that device (and any others that might be sharing the same driver).
if (isX86PowerVR) {
fSRGBSupport = false;
}
// ES through 3.1 requires EXT_srgb_write_control to support toggling
// sRGB writing for destinations.
// See https://bug.skia.org/5329 for Adreno4xx issue.
fSRGBWriteControl = kAdreno4xx_GrGLRenderer != ctxInfo.renderer() &&
ctxInfo.hasExtension("GL_EXT_sRGB_write_control");
}
if (contextOptions.fRequireDecodeDisableForSRGB && !fSRGBDecodeDisableSupport) {
// To support "legacy" L32 mode, we require the ability to turn off sRGB decode. Clients
// can opt-out of that requirement, if they intend to always do linear blending.
fSRGBSupport = false;
}
// This is very conservative, if we're on a platform where N32 is BGRA, and using ES, disable
// all sRGB support. Too much code relies on creating surfaces with N32 + sRGB colorspace,
// and sBGRA is basically impossible to support on any version of ES (with our current code).
// In particular, ES2 doesn't support sBGRA at all, and even in ES3, there is no valid pair
// of formats that can be used for TexImage calls to upload BGRA data to sRGBA (which is what
// we *have* to use as the internal format, because sBGRA doesn't exist). This primarily
// affects Windows.
if (kSkia8888_GrPixelConfig == kBGRA_8888_GrPixelConfig && kGLES_GrGLStandard == standard) {
fSRGBSupport = false;
}
// ES2 Command Buffer has several TexStorage restrictions. It appears to fail for any format
// not explicitly allowed by GL_EXT_texture_storage, particularly those from other extensions.
bool isCommandBufferES2 = kChromium_GrGLDriver == ctxInfo.driver() && version < GR_GL_VER(3, 0);
uint32_t srgbRenderFlags = allRenderFlags;
// MacPro devices with AMD cards fail to create MSAA sRGB render buffers
#if defined(SK_BUILD_FOR_MAC)
if (kATI_GrGLVendor == ctxInfo.vendor()) {
srgbRenderFlags &= ~ConfigInfo::kRenderableWithMSAA_Flag;
}
#endif
fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_SRGB_ALPHA;
fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_SRGB8_ALPHA8;
// GL does not do srgb<->rgb conversions when transferring between cpu and gpu. Thus, the
// external format is GL_RGBA. See below for note about ES2.0 and glTex[Sub]Image.
fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RGBA;
fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
fConfigTable[kSRGBA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
if (fSRGBSupport) {
fConfigTable[kSRGBA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
srgbRenderFlags;
}
// ES2 Command Buffer does not allow TexStorage with SRGB8_ALPHA8_EXT
if (texStorageSupported && !isCommandBufferES2) {
fConfigTable[kSRGBA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kSRGBA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
// sBGRA is not a "real" thing in OpenGL, but GPUs support it, and on platforms where
// kN32 == BGRA, we need some way to work with it. (The default framebuffer on Windows
// is in this format, for example).
fConfigTable[kSBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_SRGB_ALPHA;
fConfigTable[kSBGRA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_SRGB8_ALPHA8;
// GL does not do srgb<->rgb conversions when transferring between cpu and gpu. Thus, the
// external format is GL_BGRA.
fConfigTable[kSBGRA_8888_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_BGRA;
fConfigTable[kSBGRA_8888_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
fConfigTable[kSBGRA_8888_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
if (fSRGBSupport && kGL_GrGLStandard == standard) {
fConfigTable[kSBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
srgbRenderFlags;
}
if (texStorageSupported) {
fConfigTable[kSBGRA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kSBGRA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
bool hasIntegerTextures;
if (standard == kGL_GrGLStandard) {
hasIntegerTextures = version >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_EXT_texture_integer");
} else {
hasIntegerTextures = (version >= GR_GL_VER(3, 0));
}
// We may have limited GLSL to an earlier version that doesn't have integer sampler types.
if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
hasIntegerTextures = false;
}
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA_INTEGER;
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA8I;
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = GR_GL_RGBA_INTEGER;
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFormats.fExternalType = GR_GL_BYTE;
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFormatType = kInteger_FormatType;
// We currently only support using integer textures as srcs, not for rendering (even though GL
// allows it).
if (hasIntegerTextures) {
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
ConfigInfo::kFBOColorAttachment_Flag;
if (texStorageSupported) {
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFlags |=
ConfigInfo::kCanUseTexStorage_Flag;
}
}
fConfigTable[kRGB_565_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGB;
if (this->ES2CompatibilitySupport()) {
fConfigTable[kRGB_565_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGB565;
} else {
fConfigTable[kRGB_565_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGB5;
}
fConfigTable[kRGB_565_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RGB;
fConfigTable[kRGB_565_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_SHORT_5_6_5;
fConfigTable[kRGB_565_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kRGB_565_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(4, 2) || ctxInfo.hasExtension("GL_ARB_ES2_compatibility")) {
fConfigTable[kRGB_565_GrPixelConfig].fFlags |= allRenderFlags;
}
} else {
fConfigTable[kRGB_565_GrPixelConfig].fFlags |= allRenderFlags;
}
// 565 is not a sized internal format on desktop GL. So on desktop with
// 565 we always use an unsized internal format to let the system pick
// the best sized format to convert the 565 data to. Since TexStorage
// only allows sized internal formats we disallow it.
//
// TODO: As of 4.2, regular GL supports 565. This logic is due for an
// update.
if (texStorageSupported && kGL_GrGLStandard != standard) {
fConfigTable[kRGB_565_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kRGB_565_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA4;
fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RGBA;
fConfigTable[kRGBA_4444_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_SHORT_4_4_4_4;
fConfigTable[kRGBA_4444_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kRGBA_4444_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(4, 2)) {
fConfigTable[kRGBA_4444_GrPixelConfig].fFlags |= allRenderFlags;
}
} else {
fConfigTable[kRGBA_4444_GrPixelConfig].fFlags |= allRenderFlags;
}
if (texStorageSupported) {
fConfigTable[kRGBA_4444_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kRGBA_4444_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
fConfigTable[kAlpha_8_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kAlpha_8_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
if (this->textureRedSupport()) {
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RED;
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_R8;
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RED;
fConfigTable[kAlpha_8_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
if (texelBufferSupport) {
fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
}
fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= allRenderFlags;
} else {
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_ALPHA;
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_ALPHA8;
fConfigTable[kAlpha_8_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_ALPHA;
fConfigTable[kAlpha_8_GrPixelConfig].fSwizzle = GrSwizzle::AAAA();
if (fAlpha8IsRenderable) {
fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= allRenderFlags;
}
}
// ES2 Command Buffer does not allow TexStorage with R8_EXT (so Alpha_8 and Gray_8)
if (texStorageSupported && !isCommandBufferES2) {
fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kGray_8_GrPixelConfig].fFormats.fExternalType = GR_GL_UNSIGNED_BYTE;
fConfigTable[kGray_8_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kGray_8_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
if (this->textureRedSupport()) {
fConfigTable[kGray_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RED;
fConfigTable[kGray_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_R8;
fConfigTable[kGray_8_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RED;
fConfigTable[kGray_8_GrPixelConfig].fSwizzle = GrSwizzle::RRRA();
if (texelBufferSupport) {
fConfigTable[kGray_8_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
}
} else {
fConfigTable[kGray_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_LUMINANCE;
fConfigTable[kGray_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_LUMINANCE8;
fConfigTable[kGray_8_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_LUMINANCE;
fConfigTable[kGray_8_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
}
#if 0 // Leaving Gray8 as non-renderable, to keep things simple and match raster
if (this->textureRedSupport() ||
(kDesktop_ARB_MSFBOType == this->msFBOType() &&
ctxInfo.renderer() != kOSMesa_GrGLRenderer)) {
// desktop ARB extension/3.0+ supports LUMINANCE8 as renderable.
// However, osmesa fails if it used even when GL_ARB_framebuffer_object is present.
// Core profile removes LUMINANCE8 support, but we should have chosen R8 in that case.
fConfigTable[kGray_8_GrPixelConfig].fFlags |= allRenderFlags;
}
#endif
if (texStorageSupported && !isCommandBufferES2) {
fConfigTable[kGray_8_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
// Check for [half] floating point texture support
// NOTE: We disallow floating point textures on ES devices if linear filtering modes are not
// supported. This is for simplicity, but a more granular approach is possible. Coincidentally,
// [half] floating point textures became part of the standard in ES3.1 / OGL 3.0.
bool hasFPTextures = false;
bool hasHalfFPTextures = false;
bool rgIsTexturable = false;
// for now we don't support floating point MSAA on ES
uint32_t fpRenderFlags = (kGL_GrGLStandard == standard) ? allRenderFlags : nonMSAARenderFlags;
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_texture_float")) {
hasFPTextures = true;
hasHalfFPTextures = true;
rgIsTexturable = true;
}
} else {
if (version >= GR_GL_VER(3, 1)) {
hasFPTextures = true;
hasHalfFPTextures = true;
rgIsTexturable = true;
} else {
if (ctxInfo.hasExtension("GL_OES_texture_float_linear") &&
ctxInfo.hasExtension("GL_OES_texture_float")) {
hasFPTextures = true;
}
if (ctxInfo.hasExtension("GL_OES_texture_half_float_linear") &&
ctxInfo.hasExtension("GL_OES_texture_half_float")) {
hasHalfFPTextures = true;
}
}
}
for (auto fpconfig : {kRGBA_float_GrPixelConfig, kRG_float_GrPixelConfig}) {
const GrGLenum format = kRGBA_float_GrPixelConfig == fpconfig ? GR_GL_RGBA : GR_GL_RG;
fConfigTable[fpconfig].fFormats.fBaseInternalFormat = format;
fConfigTable[fpconfig].fFormats.fSizedInternalFormat =
kRGBA_float_GrPixelConfig == fpconfig ? GR_GL_RGBA32F : GR_GL_RG32F;
fConfigTable[fpconfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = format;
fConfigTable[fpconfig].fFormats.fExternalType = GR_GL_FLOAT;
fConfigTable[fpconfig].fFormatType = kFloat_FormatType;
if (hasFPTextures) {
fConfigTable[fpconfig].fFlags = rgIsTexturable ? ConfigInfo::kTextureable_Flag : 0;
// For now we only enable rendering to float on desktop, because on ES we'd have to
// solve many precision issues and no clients actually want this yet.
if (kGL_GrGLStandard == standard /* || version >= GR_GL_VER(3,2) ||
ctxInfo.hasExtension("GL_EXT_color_buffer_float")*/) {
fConfigTable[fpconfig].fFlags |= fpRenderFlags;
}
}
if (texStorageSupported) {
fConfigTable[fpconfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
if (texelBufferSupport) {
fConfigTable[fpconfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
}
fConfigTable[fpconfig].fSwizzle = GrSwizzle::RGBA();
}
if (this->textureRedSupport()) {
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RED;
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_R16F;
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage]
= GR_GL_RED;
fConfigTable[kAlpha_half_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
if (texelBufferSupport) {
fConfigTable[kAlpha_half_GrPixelConfig].fFlags |=
ConfigInfo::kCanUseWithTexelBuffer_Flag;
}
} else {
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_ALPHA;
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_ALPHA16F;
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage]
= GR_GL_ALPHA;
fConfigTable[kAlpha_half_GrPixelConfig].fSwizzle = GrSwizzle::AAAA();
}
// ANGLE always returns GL_HALF_FLOAT_OES for GL_IMPLEMENTATION_COLOR_READ_TYPE, even though
// ES3 would typically return GL_HALF_FLOAT. The correct fix is for us to respect the value
// returned when we query, but that turns into a bigger refactor, so just work around it.
if (kGL_GrGLStandard == ctxInfo.standard() ||
(ctxInfo.version() >= GR_GL_VER(3, 0) && kANGLE_GrGLDriver != ctxInfo.driver())) {
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalType = GR_GL_HALF_FLOAT;
} else {
fConfigTable[kAlpha_half_GrPixelConfig].fFormats.fExternalType = GR_GL_HALF_FLOAT_OES;
}
fConfigTable[kAlpha_half_GrPixelConfig].fFormatType = kFloat_FormatType;
if (texStorageSupported) {
fConfigTable[kAlpha_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
if (hasHalfFPTextures) {
fConfigTable[kAlpha_half_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
// ES requires either 3.2 or the combination of EXT_color_buffer_half_float and support for
// GL_RED internal format.
if (kGL_GrGLStandard == standard || version >= GR_GL_VER(3, 2) ||
(this->textureRedSupport() &&
ctxInfo.hasExtension("GL_EXT_color_buffer_half_float"))) {
fConfigTable[kAlpha_half_GrPixelConfig].fFlags |= fpRenderFlags;
}
}
fConfigTable[kRGBA_half_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
fConfigTable[kRGBA_half_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA16F;
fConfigTable[kRGBA_half_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RGBA;
// See comment above, re: ANGLE and ES3.
if (kGL_GrGLStandard == ctxInfo.standard() ||
(ctxInfo.version() >= GR_GL_VER(3, 0) && kANGLE_GrGLDriver != ctxInfo.driver())) {
fConfigTable[kRGBA_half_GrPixelConfig].fFormats.fExternalType = GR_GL_HALF_FLOAT;
} else {
fConfigTable[kRGBA_half_GrPixelConfig].fFormats.fExternalType = GR_GL_HALF_FLOAT_OES;
}
fConfigTable[kRGBA_half_GrPixelConfig].fFormatType = kFloat_FormatType;
if (hasHalfFPTextures) {
fConfigTable[kRGBA_half_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
// ES requires 3.2 or EXT_color_buffer_half_float.
if (kGL_GrGLStandard == standard || version >= GR_GL_VER(3,2) ||
ctxInfo.hasExtension("GL_EXT_color_buffer_half_float")) {
fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= fpRenderFlags;
}
}
if (texStorageSupported) {
fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
if (texelBufferSupport) {
fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseWithTexelBuffer_Flag;
}
fConfigTable[kRGBA_half_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
// Bulk populate the texture internal/external formats here and then deal with exceptions below.
// ES 2.0 requires that the internal/external formats match.
bool useSizedTexFormats = (kGL_GrGLStandard == ctxInfo.standard() ||
ctxInfo.version() >= GR_GL_VER(3,0));
// All ES versions (thus far) require sized internal formats for render buffers.
// TODO: Always use sized internal format?
bool useSizedRbFormats = kGLES_GrGLStandard == ctxInfo.standard();
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
// Almost always we want to pass fExternalFormat[kOther_ExternalFormatUsage] as the <format>
// param to glTex[Sub]Image.
fConfigTable[i].fFormats.fExternalFormat[kTexImage_ExternalFormatUsage] =
fConfigTable[i].fFormats.fExternalFormat[kOther_ExternalFormatUsage];
fConfigTable[i].fFormats.fInternalFormatTexImage = useSizedTexFormats ?
fConfigTable[i].fFormats.fSizedInternalFormat :
fConfigTable[i].fFormats.fBaseInternalFormat;
fConfigTable[i].fFormats.fInternalFormatRenderbuffer = useSizedRbFormats ?
fConfigTable[i].fFormats.fSizedInternalFormat :
fConfigTable[i].fFormats.fBaseInternalFormat;
}
// OpenGL ES 2.0 + GL_EXT_sRGB allows GL_SRGB_ALPHA to be specified as the <format>
// param to Tex(Sub)Image. ES 2.0 requires the <internalFormat> and <format> params to match.
// Thus, on ES 2.0 we will use GL_SRGB_ALPHA as the <format> param.
// On OpenGL and ES 3.0+ GL_SRGB_ALPHA does not work for the <format> param to glTexImage.
if (ctxInfo.standard() == kGLES_GrGLStandard && ctxInfo.version() == GR_GL_VER(2,0)) {
fConfigTable[kSRGBA_8888_GrPixelConfig].fFormats.fExternalFormat[kTexImage_ExternalFormatUsage] =
GR_GL_SRGB_ALPHA;
// Additionally, because we had to "invent" sBGRA, there is no way to make it work
// in ES 2.0, because there is no <internalFormat> we can use. So just make that format
// unsupported. (If we have no sRGB support at all, this will get overwritten below).
fConfigTable[kSBGRA_8888_GrPixelConfig].fFlags = 0;
}
// If BGRA is supported as an internal format it must always be specified to glTex[Sub]Image
// as a base format.
// GL_EXT_texture_format_BGRA8888:
// This extension GL_BGRA as an unsized internal format. However, it is written against ES
// 2.0 and therefore doesn't define a value for GL_BGRA8 as ES 2.0 uses unsized internal
// formats.
// GL_APPLE_texture_format_BGRA8888:
// ES 2.0: the extension makes BGRA an external format but not an internal format.
// ES 3.0: the extension explicitly states GL_BGRA8 is not a valid internal format for
// glTexImage (just for glTexStorage).
if (useSizedTexFormats && this->bgraIsInternalFormat()) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fInternalFormatTexImage = GR_GL_BGRA;
}
// If we don't have texture swizzle support then the shader generator must insert the
// swizzle into shader code.
if (!this->textureSwizzleSupport()) {
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
shaderCaps->fConfigTextureSwizzle[i] = fConfigTable[i].fSwizzle;
}
}
// Shader output swizzles will default to RGBA. When we've use GL_RED instead of GL_ALPHA to
// implement kAlpha_8_GrPixelConfig we need to swizzle the shader outputs so the alpha channel
// gets written to the single component.
if (this->textureRedSupport()) {
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
GrPixelConfig config = static_cast<GrPixelConfig>(i);
if (GrPixelConfigIsAlphaOnly(config) &&
fConfigTable[i].fFormats.fBaseInternalFormat == GR_GL_RED) {
shaderCaps->fConfigOutputSwizzle[i] = GrSwizzle::AAAA();
}
}
}
// We currently only support images on rgba textures formats. We could add additional formats
// if desired. The shader builder would have to be updated to add swizzles where appropriate
// (e.g. where we use GL_RED textures to implement alpha configs).
if (this->shaderCaps()->imageLoadStoreSupport()) {
fConfigTable[kRGBA_8888_sint_GrPixelConfig].fFlags |=
ConfigInfo::kCanUseAsImageStorage_Flag;
// In OpenGL ES a texture may only be used with BindImageTexture if it has been made
// immutable via TexStorage. We create non-integer textures as mutable textures using
// TexImage because we may lazily add MIP levels. Thus, on ES we currently disable image
// storage support for non-integer textures.
if (kGL_GrGLStandard == ctxInfo.standard()) {
fConfigTable[kRGBA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseAsImageStorage_Flag;
fConfigTable[kRGBA_float_GrPixelConfig].fFlags |=
ConfigInfo::kCanUseAsImageStorage_Flag;
fConfigTable[kRGBA_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseAsImageStorage_Flag;
}
}
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
if (ConfigInfo::kRenderableWithMSAA_Flag & fConfigTable[i].fFlags) {
if ((kGL_GrGLStandard == ctxInfo.standard() &&
(ctxInfo.version() >= GR_GL_VER(4,2) ||
ctxInfo.hasExtension("GL_ARB_internalformat_query"))) ||
(kGLES_GrGLStandard == ctxInfo.standard() && ctxInfo.version() >= GR_GL_VER(3,0))) {
int count;
GrGLenum format = fConfigTable[i].fFormats.fInternalFormatRenderbuffer;
GR_GL_GetInternalformativ(gli, GR_GL_RENDERBUFFER, format, GR_GL_NUM_SAMPLE_COUNTS,
1, &count);
if (count) {
int* temp = new int[count];
GR_GL_GetInternalformativ(gli, GR_GL_RENDERBUFFER, format, GR_GL_SAMPLES, count,
temp);
fConfigTable[i].fColorSampleCounts.setCount(count+1);
// We initialize our supported values with 0 (no msaa) and reverse the order
// returned by GL so that the array is ascending.
fConfigTable[i].fColorSampleCounts[0] = 0;
for (int j = 0; j < count; ++j) {
fConfigTable[i].fColorSampleCounts[j+1] = temp[count - j - 1];
}
delete[] temp;
}
} else {
static const int kDefaultSamples[] = {0,1,2,4,8};
int count = SK_ARRAY_COUNT(kDefaultSamples);
for (; count > 0; --count) {
if (kDefaultSamples[count-1] <= fMaxColorSampleCount) {
break;
}
}
if (count > 0) {
fConfigTable[i].fColorSampleCounts.append(count, kDefaultSamples);
}
}
}
}
#ifdef SK_DEBUG
// Make sure we initialized everything.
ConfigInfo defaultEntry;
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
// Make sure we didn't set renderable and not blittable or renderable with msaa and not
// renderable.
SkASSERT(!((ConfigInfo::kRenderable_Flag) && !(ConfigInfo::kFBOColorAttachment_Flag)));
SkASSERT(!((ConfigInfo::kRenderableWithMSAA_Flag) && !(ConfigInfo::kRenderable_Flag)));
SkASSERT(defaultEntry.fFormats.fBaseInternalFormat !=
fConfigTable[i].fFormats.fBaseInternalFormat);
SkASSERT(defaultEntry.fFormats.fSizedInternalFormat !=
fConfigTable[i].fFormats.fSizedInternalFormat);
for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
fConfigTable[i].fFormats.fExternalFormat[j]);
}
SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
}
#endif
}
bool GrGLCaps::initDescForDstCopy(const GrRenderTargetProxy* src, GrSurfaceDesc* desc,
bool* rectsMustMatch, bool* disallowSubrect) const {
// By default, we don't require rects to match.
*rectsMustMatch = false;
// By default, we allow subrects.
*disallowSubrect = false;
// If the src is a texture, we can implement the blit as a draw assuming the config is
// renderable.
if (src->asTextureProxy() && this->isConfigRenderable(src->config(), false)) {
desc->fOrigin = kBottomLeft_GrSurfaceOrigin;
desc->fFlags = kRenderTarget_GrSurfaceFlag;
desc->fConfig = src->config();
return true;
}
{
// The only way we could see a non-GR_GL_TEXTURE_2D texture would be if it were
// wrapped. In that case the proxy would already be instantiated.
const GrTexture* srcTexture = src->priv().peekTexture();
const GrGLTexture* glSrcTexture = static_cast<const GrGLTexture*>(srcTexture);
if (glSrcTexture && glSrcTexture->target() != GR_GL_TEXTURE_2D) {
// Not supported for FBO blit or CopyTexSubImage
return false;
}
}
// We look for opportunities to use CopyTexSubImage, or fbo blit. If neither are
// possible and we return false to fallback to creating a render target dst for render-to-
// texture. This code prefers CopyTexSubImage to fbo blit and avoids triggering temporary fbo
// creation. It isn't clear that avoiding temporary fbo creation is actually optimal.
GrSurfaceOrigin originForBlitFramebuffer = kTopLeft_GrSurfaceOrigin;
bool rectsMustMatchForBlitFramebuffer = false;
bool disallowSubrectForBlitFramebuffer = false;
if (src->numColorSamples() &&
(this->blitFramebufferSupportFlags() & kResolveMustBeFull_BlitFrambufferFlag)) {
rectsMustMatchForBlitFramebuffer = true;
disallowSubrectForBlitFramebuffer = true;
// Mirroring causes rects to mismatch later, don't allow it.
originForBlitFramebuffer = src->origin();
} else if (src->numColorSamples() && (this->blitFramebufferSupportFlags() &
kRectsMustMatchForMSAASrc_BlitFramebufferFlag)) {
rectsMustMatchForBlitFramebuffer = true;
// Mirroring causes rects to mismatch later, don't allow it.
originForBlitFramebuffer = src->origin();
} else if (this->blitFramebufferSupportFlags() & kNoScalingOrMirroring_BlitFramebufferFlag) {
originForBlitFramebuffer = src->origin();
}
// Check for format issues with glCopyTexSubImage2D
if (this->bgraIsInternalFormat() && kBGRA_8888_GrPixelConfig == src->config()) {
// glCopyTexSubImage2D doesn't work with this config. If the bgra can be used with fbo blit
// then we set up for that, otherwise fail.
if (this->canConfigBeFBOColorAttachment(kBGRA_8888_GrPixelConfig)) {
desc->fOrigin = originForBlitFramebuffer;
desc->fConfig = kBGRA_8888_GrPixelConfig;
*rectsMustMatch = rectsMustMatchForBlitFramebuffer;
*disallowSubrect = disallowSubrectForBlitFramebuffer;
return true;
}
return false;
}
{
bool srcIsMSAARenderbuffer = GrFSAAType::kUnifiedMSAA == src->fsaaType() &&
this->usesMSAARenderBuffers();
if (srcIsMSAARenderbuffer) {
// It's illegal to call CopyTexSubImage2D on a MSAA renderbuffer. Set up for FBO
// blit or fail.
if (this->canConfigBeFBOColorAttachment(src->config())) {
desc->fOrigin = originForBlitFramebuffer;
desc->fConfig = src->config();
*rectsMustMatch = rectsMustMatchForBlitFramebuffer;
*disallowSubrect = disallowSubrectForBlitFramebuffer;
return true;
}
return false;
}
}
// We'll do a CopyTexSubImage. Make the dst a plain old texture.
desc->fConfig = src->config();
desc->fOrigin = src->origin();
desc->fFlags = kNone_GrSurfaceFlags;
return true;
}
void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {
if (options.fEnableInstancedRendering) {
fInstancedSupport = gr_instanced::GLInstancedRendering::CheckSupport(*this);
#ifndef SK_BUILD_FOR_MAC
// OS X doesn't seem to write correctly to floating point textures when using
// glDraw*Indirect, regardless of the underlying GPU.
fAvoidInstancedDrawsToFPTargets = true;
#endif
}
if (options.fUseDrawInsteadOfPartialRenderTargetWrite) {
fUseDrawInsteadOfAllRenderTargetWrites = true;
}
}
int GrGLCaps::getSampleCount(int requestedCount, GrPixelConfig config) const {
int count = fConfigTable[config].fColorSampleCounts.count();
if (!count || !this->isConfigRenderable(config, true)) {
return 0;
}
for (int i = 0; i < count; ++i) {
if (fConfigTable[config].fColorSampleCounts[i] >= requestedCount) {
return fConfigTable[config].fColorSampleCounts[i];
}
}
return fConfigTable[config].fColorSampleCounts[count-1];
}