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gerrit-public.fairphone.software / platform / external / skia / fda880710c28a1b0ff0c8c88f90a7659a7ce553f / . / src / gpu / gl / GrGLCaps.cpp
blob: 0322a0f57cdf23812eecf9d0b162b28c96ba38f8 [file] [log] [blame]
/*
* 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 "glsl/GrGLSLCaps.h"
#include "SkTSearch.h"
#include "SkTSort.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;
fImagingSupport = false;
fVertexArrayObjectSupport = false;
fDirectStateAccessSupport = false;
fDebugSupport = false;
fES2CompatibilitySupport = false;
fMultisampleDisableSupport = false;
fDrawIndirectSupport = false;
fMultiDrawIndirectSupport = false;
fBaseInstanceSupport = false;
fUseNonVBOVertexAndIndexDynamicData = false;
fIsCoreProfile = false;
fBindFragDataLocationSupport = false;
fRectangleTextureSupport = false;
fTextureSwizzleSupport = false;
fRGBA8888PixelsOpsAreSlow = false;
fPartialFBOReadIsSlow = false;
fMipMapLevelAndLodControlSupport = false;
fRGBAToBGRAReadbackConversionsAreSlow = false;
fBlitFramebufferSupport = kNone_BlitFramebufferSupport;
fShaderCaps.reset(new GrGLSLCaps(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();
/**************************************************************************
* Caps specific to GrGLCaps
**************************************************************************/
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 mesa doesn't support GL_RED
// and GL_RG on FBO textures.
if (kMesa_GrGLDriver != ctxInfo.driver()) {
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");
// 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())) {
fUseNonVBOVertexAndIndexDynamicData = true;
}
// 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) {
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;
}
}
#if 0 // Disabled due to https://bug.skia.org/4454
fBindUniformLocationSupport = ctxInfo.hasExtension("GL_CHROMIUM_bind_uniform_location");
#else
fBindUniformLocationSupport = false;
#endif
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;
/**************************************************************************
* GrShaderCaps fields
**************************************************************************/
// This must be called after fCoreProfile is set on the GrGLCaps
this->initGLSL(ctxInfo);
GrGLSLCaps* glslCaps = static_cast<GrGLSLCaps*>(fShaderCaps.get());
glslCaps->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.
glslCaps->fDstReadInShaderSupport = glslCaps->fFBFetchSupport;
// Enable supported shader-related caps
if (kGL_GrGLStandard == standard) {
glslCaps->fDualSourceBlendingSupport = (ctxInfo.version() >= GR_GL_VER(3, 3) ||
ctxInfo.hasExtension("GL_ARB_blend_func_extended")) &&
GrGLSLSupportsNamedFragmentShaderOutputs(ctxInfo.glslGeneration());
glslCaps->fShaderDerivativeSupport = true;
// we don't support GL_ARB_geometry_shader4, just GL 3.2+ GS
glslCaps->fGeometryShaderSupport = ctxInfo.version() >= GR_GL_VER(3, 2) &&
ctxInfo.glslGeneration() >= k150_GrGLSLGeneration;
glslCaps->fIntegerSupport = ctxInfo.version() >= GR_GL_VER(3, 0) &&
ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
}
else {
glslCaps->fDualSourceBlendingSupport = ctxInfo.hasExtension("GL_EXT_blend_func_extended");
glslCaps->fShaderDerivativeSupport = ctxInfo.version() >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_OES_standard_derivatives");
glslCaps->fIntegerSupport = ctxInfo.version() >= GR_GL_VER(3, 0) &&
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
}
if (ctxInfo.hasExtension("GL_EXT_shader_pixel_local_storage")) {
#define GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT 0x8F63
GR_GL_GetIntegerv(gli, GL_MAX_SHADER_PIXEL_LOCAL_STORAGE_FAST_SIZE_EXT,
&glslCaps->fPixelLocalStorageSize);
glslCaps->fPLSPathRenderingSupport = glslCaps->fFBFetchSupport;
}
else {
glslCaps->fPixelLocalStorageSize = 0;
glslCaps->fPLSPathRenderingSupport = false;
}
// 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);
glslCaps->fMaxVertexSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
if (glslCaps->fGeometryShaderSupport) {
GR_GL_GetIntegerv(gli, GR_GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS, &maxSamplers);
glslCaps->fMaxGeometrySamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
}
GR_GL_GetIntegerv(gli, GR_GL_MAX_TEXTURE_IMAGE_UNITS, &maxSamplers);
glslCaps->fMaxFragmentSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
GR_GL_GetIntegerv(gli, GR_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxSamplers);
glslCaps->fMaxCombinedSamplers = SkTMin<GrGLint>(kMaxSaneSamplers, maxSamplers);
/**************************************************************************
* GrCaps fields
**************************************************************************/
// We need dual source blending and the ability to disable multisample in order to support mixed
// samples in every corner case.
if (fMultisampleDisableSupport &&
glslCaps->dualSourceBlendingSupport() &&
fShaderCaps->pathRenderingSupport()) {
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;
}
}
// fUsesMixedSamples must be set before calling initFSAASupport.
this->initFSAASupport(ctxInfo, gli);
this->initBlendEqationSupport(ctxInfo);
this->initStencilFormats(ctxInfo);
if (kGL_GrGLStandard == standard) {
// we could also look for GL_ATI_separate_stencil extension or
// GL_EXT_stencil_two_side but they use different function signatures
// than GL2.0+ (and than each other).
fTwoSidedStencilSupport = (ctxInfo.version() >= GR_GL_VER(2,0));
// supported on GL 1.4 and higher or by extension
fStencilWrapOpsSupport = (ctxInfo.version() >= GR_GL_VER(1,4)) ||
ctxInfo.hasExtension("GL_EXT_stencil_wrap");
} else {
// ES 2 has two sided stencil and stencil wrap
fTwoSidedStencilSupport = true;
fStencilWrapOpsSupport = true;
}
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;
}
}
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_pixel_buffer_object")) {
fTransferBufferType = kPBO_TransferBufferType;
}
} else {
if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_NV_pixel_buffer_object")) {
fTransferBufferType = kPBO_TransferBufferType;
} 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) {
// We think mapping on Chromium will be cheaper once we know ahead of time how much space
// we will use for all GrBatchs. Right now we might wind up mapping a large buffer and using
// a small subset.
#if 0
fBufferMapThreshold = kChromium_GrGLDriver == ctxInfo.driver() ? 0 : SK_MaxS32;
#else
fBufferMapThreshold = SK_MaxS32;
#endif
}
if (kGL_GrGLStandard == standard) {
SkASSERT(ctxInfo.version() >= GR_GL_VER(2,0) ||
ctxInfo.hasExtension("GL_ARB_texture_non_power_of_two"));
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() &&
kQualcomm_GrGLVendor != ctxInfo.vendor();
#if 0
fReuseScratchBuffers = kARM_GrGLVendor != ctxInfo.vendor() &&
kQualcomm_GrGLVendor != ctxInfo.vendor();
#endif
// initFSAASupport() must have been called before this point
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;
if (kPowerVR54x_GrGLRenderer == ctxInfo.renderer() ||
kPowerVRRogue_GrGLRenderer == ctxInfo.renderer() ||
kAdreno3xx_GrGLRenderer == ctxInfo.renderer()) {
fUseDrawInsteadOfClear = true;
}
if (kAdreno4xx_GrGLRenderer == ctxInfo.renderer()) {
fUseDrawInsteadOfPartialRenderTargetWrite = true;
}
// Texture uploads sometimes seem to be ignored to textures bound to FBOS on Tegra3.
if (kTegra3_GrGLRenderer == ctxInfo.renderer()) {
fUseDrawInsteadOfPartialRenderTargetWrite = 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) {
// 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
fSupportsInstancedDraws =
version >= GR_GL_VER(3, 2) ||
(ctxInfo.hasExtension("GL_ARB_draw_instanced") &&
ctxInfo.hasExtension("GL_ARB_instanced_arrays"));
} else {
fSupportsInstancedDraws =
version >= GR_GL_VER(3, 0) ||
(ctxInfo.hasExtension("GL_EXT_draw_instanced") &&
ctxInfo.hasExtension("GL_EXT_instanced_arrays"));
}
if (kGL_GrGLStandard == standard) {
// We don't use ARB_draw_indirect because it does not support a base instance.
// We don't use ARB_multi_draw_indirect because it does not support GL_DRAW_INDIRECT_BUFFER.
fDrawIndirectSupport =
fMultiDrawIndirectSupport = fBaseInstanceSupport = version >= GR_GL_VER(4,3);
} else {
fDrawIndirectSupport = version >= GR_GL_VER(3,1);
fMultiDrawIndirectSupport = ctxInfo.hasExtension("GL_EXT_multi_draw_indirect");
fBaseInstanceSupport = ctxInfo.hasExtension("GL_EXT_base_instance");
}
this->initShaderPrecisionTable(ctxInfo, gli, glslCaps);
if (contextOptions.fUseShaderSwizzling) {
fTextureSwizzleSupport = false;
}
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(4, 0) || ctxInfo.hasExtension("GL_ARB_sample_shading")) {
fSampleShadingSupport = true;
}
} else if (ctxInfo.hasExtension("GL_OES_sample_shading")) {
fSampleShadingSupport = true;
}
// Requires fTextureRedSupport, fTextureSwizzleSupport, msaa support, ES compatibility have
// already been detected.
this->initConfigTable(ctxInfo, gli, glslCaps);
this->applyOptionsOverrides(contextOptions);
glslCaps->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 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 GrGLSLCaps
**************************************************************************/
GrGLSLCaps* glslCaps = static_cast<GrGLSLCaps*>(fShaderCaps.get());
glslCaps->fGLSLGeneration = ctxInfo.glslGeneration();
if (kGLES_GrGLStandard == standard) {
if (ctxInfo.hasExtension("GL_EXT_shader_framebuffer_fetch")) {
glslCaps->fFBFetchNeedsCustomOutput = (version >= GR_GL_VER(3, 0));
glslCaps->fFBFetchSupport = true;
glslCaps->fFBFetchColorName = "gl_LastFragData[0]";
glslCaps->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
glslCaps->fFBFetchNeedsCustomOutput = false;
glslCaps->fFBFetchSupport = true;
glslCaps->fFBFetchColorName = "gl_LastFragData[0]";
glslCaps->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
glslCaps->fFBFetchNeedsCustomOutput = false;
glslCaps->fFBFetchSupport = true;
glslCaps->fFBFetchColorName = "gl_LastFragColorARM";
glslCaps->fFBFetchExtensionString = "GL_ARM_shader_framebuffer_fetch";
}
glslCaps->fUsesPrecisionModifiers = true;
}
glslCaps->fBindlessTextureSupport = ctxInfo.hasExtension("GL_NV_bindless_texture");
if (kGL_GrGLStandard == standard) {
glslCaps->fFlatInterpolationSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
} else {
glslCaps->fFlatInterpolationSupport =
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // This is the value for GLSL ES 3.0.
}
if (kGL_GrGLStandard == standard) {
glslCaps->fNoPerspectiveInterpolationSupport =
ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
} else {
if (ctxInfo.hasExtension("GL_NV_shader_noperspective_interpolation")) {
glslCaps->fNoPerspectiveInterpolationSupport = true;
glslCaps->fNoPerspectiveInterpolationExtensionString =
"GL_NV_shader_noperspective_interpolation";
}
}
if (kGL_GrGLStandard == standard) {
glslCaps->fMultisampleInterpolationSupport =
ctxInfo.glslGeneration() >= k400_GrGLSLGeneration;
} else {
if (ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
glslCaps->fMultisampleInterpolationSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_shader_multisample_interpolation")) {
glslCaps->fMultisampleInterpolationSupport = true;
glslCaps->fMultisampleInterpolationExtensionString =
"GL_OES_shader_multisample_interpolation";
}
}
if (kGL_GrGLStandard == standard) {
glslCaps->fSampleVariablesSupport = ctxInfo.glslGeneration() >= k400_GrGLSLGeneration;
} else {
if (ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
glslCaps->fSampleVariablesSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_sample_variables")) {
glslCaps->fSampleVariablesSupport = true;
glslCaps->fSampleVariablesExtensionString = "GL_OES_sample_variables";
}
}
if (glslCaps->fSampleVariablesSupport) {
glslCaps->fSampleMaskOverrideCoverageSupport =
ctxInfo.hasExtension("GL_NV_sample_mask_override_coverage");
}
// Adreno GPUs have a tendency to drop tiles when there is a divide-by-zero in a shader
glslCaps->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.
glslCaps->fCanUseAnyFunctionInShader = kImagination_GrGLVendor != ctxInfo.vendor();
glslCaps->fVersionDeclString = get_glsl_version_decl_string(standard, glslCaps->fGLSLGeneration,
fIsCoreProfile);
if (kGLES_GrGLStandard == standard && k110_GrGLSLGeneration == glslCaps->fGLSLGeneration) {
glslCaps->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"))) {
glslCaps->fFragCoordConventionsExtensionString = "GL_ARB_fragment_coord_conventions";
}
if (kGLES_GrGLStandard == standard) {
glslCaps->fSecondaryOutputExtensionString = "GL_EXT_blend_func_extended";
}
if (ctxInfo.hasExtension("GL_OES_EGL_image_external")) {
if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
glslCaps->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.
glslCaps->fExternalTextureSupport = true;
}
}
if (glslCaps->fExternalTextureSupport) {
if (ctxInfo.glslGeneration() == k110_GrGLSLGeneration) {
glslCaps->fExternalTextureExtensionString = "GL_OES_EGL_image_external";
} else {
glslCaps->fExternalTextureExtensionString = "GL_OES_EGL_image_external_essl3";
}
}
if (kGL_GrGLStandard == standard) {
glslCaps->fTexelFetchSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
} else {
glslCaps->fTexelFetchSupport =
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
}
if (glslCaps->fTexelFetchSupport) {
if (kGL_GrGLStandard == standard) {
glslCaps->fTexelBufferSupport = ctxInfo.version() >= GR_GL_VER(4, 3) &&
ctxInfo.glslGeneration() >= k330_GrGLSLGeneration;
} else {
if (ctxInfo.version() >= GR_GL_VER(3, 2) &&
ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
glslCaps->fTexelBufferSupport = true;
} else if (ctxInfo.hasExtension("GL_OES_texture_buffer")) {
glslCaps->fTexelBufferSupport = true;
glslCaps->fTexelBufferExtensionString = "GL_OES_texture_buffer";
} else if (ctxInfo.hasExtension("GL_EXT_texture_buffer")) {
glslCaps->fTexelBufferSupport = true;
glslCaps->fTexelBufferExtensionString = "GL_EXT_texture_buffer";
}
}
}
// 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.
if (kTegra3_GrGLRenderer == ctxInfo.renderer()) {
glslCaps->fCanUseMinAndAbsTogether = 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()) {
glslCaps->fMustForceNegatedAtanParamToFloat = true;
}
}
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 rtConfig,
GrPixelConfig readConfig,
std::function<void (GrGLenum, GrGLint*)> getIntegerv,
std::function<bool ()> bindRenderTarget) const {
// If it's not possible to even have a render target of rtConfig then read pixels is
// not supported regardless of readConfig.
if (!this->isConfigRenderable(rtConfig, false)) {
return false;
}
GrGLenum readFormat;
GrGLenum readType;
if (!this->getReadPixelsFormat(rtConfig, 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.
if (readFormat != GR_GL_RED && readFormat != GR_GL_RGB && readFormat != GR_GL_RGBA &&
readFormat != GR_GL_BGRA) {
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.
if (kNormalizedFixedPoint_FormatType == fConfigTable[rtConfig].fFormatType) {
if (GR_GL_RGBA == readFormat && GR_GL_UNSIGNED_BYTE == readType) {
return true;
}
} else {
SkASSERT(kFloat_FormatType == fConfigTable[rtConfig].fFormatType);
if (GR_GL_RGBA == readFormat && GR_GL_FLOAT == readType) {
return true;
}
}
if (0 == fConfigTable[rtConfig].fSecondReadPixelsFormat.fFormat) {
ReadPixelsFormat* rpFormat =
const_cast<ReadPixelsFormat*>(&fConfigTable[rtConfig].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;
}
return fConfigTable[rtConfig].fSecondReadPixelsFormat.fFormat == readFormat &&
fConfigTable[rtConfig].fSecondReadPixelsFormat.fType == readType;
}
void GrGLCaps::initFSAASupport(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
fMSFBOType = kNone_MSFBOType;
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 = GrGLCaps::kES_3_0_MSFBOType;
} else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
// chrome's extension is equivalent to the EXT msaa
// and fbo_blit extensions.
fMSFBOType = kDesktop_EXT_MSFBOType;
} else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
fMSFBOType = kES_Apple_MSFBOType;
}
// Above determined the preferred MSAA approach, now decide whether glBlitFramebuffer
// is available.
if (ctxInfo.version() >= GR_GL_VER(3, 0)) {
fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
} else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
// The CHROMIUM extension uses the ANGLE version of glBlitFramebuffer and includes its
// limitations.
fBlitFramebufferSupport = kNoScalingNoMirroring_BlitFramebufferSupport;
}
} else {
if (fUsesMixedSamples) {
fMSFBOType = kMixedSamples_MSFBOType;
fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
} else if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
} else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
}
}
}
void GrGLCaps::initBlendEqationSupport(const GrGLContextInfo& ctxInfo) {
GrGLSLCaps* glslCaps = static_cast<GrGLSLCaps*>(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() ||
kIntel_GrGLDriver == ctxInfo.driver() ||
kChromium_GrGLDriver == ctxInfo.driver()) {
return;
}
if (ctxInfo.hasExtension("GL_NV_blend_equation_advanced_coherent")) {
fBlendEquationSupport = kAdvancedCoherent_BlendEquationSupport;
glslCaps->fAdvBlendEqInteraction = GrGLSLCaps::kAutomatic_AdvBlendEqInteraction;
} else if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced_coherent")) {
fBlendEquationSupport = kAdvancedCoherent_BlendEquationSupport;
glslCaps->fAdvBlendEqInteraction = GrGLSLCaps::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;
glslCaps->fAdvBlendEqInteraction = GrGLSLCaps::kAutomatic_AdvBlendEqInteraction;
} else if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced")) {
fBlendEquationSupport = kAdvanced_BlendEquationSupport;
glslCaps->fAdvBlendEqInteraction = GrGLSLCaps::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()) {
// Blacklist color-dodge and color-burn on NVIDIA until the fix is released.
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::initStencilFormats(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;
}
}
}
SkString GrGLCaps::dump() const {
SkString r = INHERITED::dump();
r.appendf("--- GL-Specific ---\n");
for (int i = 0; i < fStencilFormats.count(); ++i) {
r.appendf("Stencil Format %d, stencil bits: %02d, total bits: %02d\n",
i,
fStencilFormats[i].fStencilBits,
fStencilFormats[i].fTotalBits);
}
static const char* kMSFBOExtStr[] = {
"None",
"ARB",
"EXT",
"ES 3.0",
"Apple",
"IMG MS To Texture",
"EXT MS To Texture",
"MixedSamples",
};
GR_STATIC_ASSERT(0 == kNone_MSFBOType);
GR_STATIC_ASSERT(1 == kDesktop_ARB_MSFBOType);
GR_STATIC_ASSERT(2 == kDesktop_EXT_MSFBOType);
GR_STATIC_ASSERT(3 == kES_3_0_MSFBOType);
GR_STATIC_ASSERT(4 == kES_Apple_MSFBOType);
GR_STATIC_ASSERT(5 == kES_IMG_MsToTexture_MSFBOType);
GR_STATIC_ASSERT(6 == kES_EXT_MsToTexture_MSFBOType);
GR_STATIC_ASSERT(7 == 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);
r.appendf("Core Profile: %s\n", (fIsCoreProfile ? "YES" : "NO"));
r.appendf("MSAA Type: %s\n", kMSFBOExtStr[fMSFBOType]);
r.appendf("Invalidate FB Type: %s\n", kInvalidateFBTypeStr[fInvalidateFBType]);
r.appendf("Map Buffer Type: %s\n", kMapBufferTypeStr[fMapBufferType]);
r.appendf("Max FS Uniform Vectors: %d\n", fMaxFragmentUniformVectors);
r.appendf("Unpack Row length support: %s\n", (fUnpackRowLengthSupport ? "YES": "NO"));
r.appendf("Unpack Flip Y support: %s\n", (fUnpackFlipYSupport ? "YES": "NO"));
r.appendf("Pack Row length support: %s\n", (fPackRowLengthSupport ? "YES": "NO"));
r.appendf("Pack Flip Y support: %s\n", (fPackFlipYSupport ? "YES": "NO"));
r.appendf("Texture Usage support: %s\n", (fTextureUsageSupport ? "YES": "NO"));
r.appendf("GL_R support: %s\n", (fTextureRedSupport ? "YES": "NO"));
r.appendf("GL_ARB_imaging support: %s\n", (fImagingSupport ? "YES": "NO"));
r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
r.appendf("Direct state access support: %s\n", (fDirectStateAccessSupport ? "YES": "NO"));
r.appendf("Debug support: %s\n", (fDebugSupport ? "YES": "NO"));
r.appendf("Multisample disable support: %s\n", (fMultisampleDisableSupport ? "YES" : "NO"));
r.appendf("Draw indirect support: %s\n", (fDrawIndirectSupport ? "YES" : "NO"));
r.appendf("Multi draw indirect support: %s\n", (fMultiDrawIndirectSupport ? "YES" : "NO"));
r.appendf("Base instance support: %s\n", (fBaseInstanceSupport ? "YES" : "NO"));
r.appendf("Use non-VBO for dynamic data: %s\n",
(fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
r.appendf("RGBA 8888 pixel ops are slow: %s\n", (fRGBA8888PixelsOpsAreSlow ? "YES" : "NO"));
r.appendf("Partial FBO read is slow: %s\n", (fPartialFBOReadIsSlow ? "YES" : "NO"));
r.appendf("Bind uniform location support: %s\n", (fBindUniformLocationSupport ? "YES" : "NO"));
r.appendf("Rectangle texture support: %s\n", (fRectangleTextureSupport? "YES" : "NO"));
r.appendf("Texture swizzle support: %s\n", (fTextureSwizzleSupport ? "YES" : "NO"));
r.appendf("BGRA to RGBA readback conversions are slow: %s\n",
(fRGBAToBGRAReadbackConversionsAreSlow ? "YES" : "NO"));
r.append("Configs\n-------\n");
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
r.appendf(" cfg: %d flags: 0x%04x, b_internal: 0x%08x s_internal: 0x%08x, e_format: "
"0x%08x, e_format_teximage: 0x%08x, e_type: 0x%08x, i_for_teximage: 0x%08x, "
"i_for_renderbuffer: 0x%08x\n",
i,
fConfigTable[i].fFlags,
fConfigTable[i].fFormats.fBaseInternalFormat,
fConfigTable[i].fFormats.fSizedInternalFormat,
fConfigTable[i].fFormats.fExternalFormat[kOther_ExternalFormatUsage],
fConfigTable[i].fFormats.fExternalFormat[kTexImage_ExternalFormatUsage],
fConfigTable[i].fFormats.fExternalType,
fConfigTable[i].fFormats.fInternalFormatTexImage,
fConfigTable[i].fFormats.fInternalFormatRenderbuffer);
}
return r;
}
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;
}
SkFAIL("Unknown precision.");
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;
}
SkFAIL("Unknown shader type.");
return -1;
}
void GrGLCaps::initShaderPrecisionTable(const GrGLContextInfo& ctxInfo,
const GrGLInterface* intf,
GrGLSLCaps* glslCaps) {
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;
glslCaps->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) {
glslCaps->fFloatPrecisions[s][p].fLogRangeLow = range[0];
glslCaps->fFloatPrecisions[s][p].fLogRangeHigh = range[1];
glslCaps->fFloatPrecisions[s][p].fBits = bits;
if (!first) {
first = &glslCaps->fFloatPrecisions[s][p];
}
else if (!glslCaps->fShaderPrecisionVaries) {
glslCaps->fShaderPrecisionVaries =
(*first != glslCaps->fFloatPrecisions[s][p]);
}
}
}
}
}
}
else {
// We're on a desktop GL that doesn't have precision info. Assume they're all 32bit float.
glslCaps->fShaderPrecisionVaries = false;
for (int s = 0; s < kGrShaderTypeCount; ++s) {
if (kGeometry_GrShaderType != s) {
for (int p = 0; p < kGrSLPrecisionCount; ++p) {
glslCaps->fFloatPrecisions[s][p].fLogRangeLow = 127;
glslCaps->fFloatPrecisions[s][p].fLogRangeHigh = 127;
glslCaps->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 (glslCaps->fGeometryShaderSupport) {
for (int p = 0; p < kGrSLPrecisionCount; ++p) {
glslCaps->fFloatPrecisions[kGeometry_GrShaderType][p] =
glslCaps->fFloatPrecisions[kVertex_GrShaderType][p];
}
}
glslCaps->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::getCompressedTexImageFormats(GrPixelConfig surfaceConfig,
GrGLenum* internalFormat) const {
if (!GrPixelConfigIsCompressed(surfaceConfig)) {
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 {
if (GrPixelConfigIsCompressed(config)) {
return false;
}
*internalFormat = fConfigTable[config].fFormats.fInternalFormatRenderbuffer;
return true;
}
bool GrGLCaps::getExternalFormat(GrPixelConfig surfaceConfig, GrPixelConfig memoryConfig,
ExternalFormatUsage usage, GrGLenum* externalFormat,
GrGLenum* externalType) const {
SkASSERT(externalFormat && externalType);
if (GrPixelConfigIsCompressed(memoryConfig) || GrPixelConfigIsCompressed(memoryConfig)) {
return false;
}
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 GrGLContextInfo& ctxInfo, const GrGLInterface* gli,
GrGLSLCaps* glslCaps) {
/*
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 allRenderFlags = ConfigInfo::kRenderable_Flag;
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 {
// Qualcomm Adreno drivers appear to have issues with texture storage.
texStorageSupported = (version >= GR_GL_VER(3,0) &&
kQualcomm_GrGLVendor != ctxInfo.vendor()) &&
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;
}
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;
}
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")) {
// The APPLE extension doesn't make this renderable.
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
if (version < GR_GL_VER(3,0) && !ctxInfo.hasExtension("GL_EXT_texture_storage")) {
// On ES2 the internal format of a BGRA texture is RGBA with the APPLE extension.
// Though, that seems to not be the case if the texture storage extension is
// present. The specs don't exactly make that clear.
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
fConfigTable[kBGRA_8888_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA8;
}
} else if (ctxInfo.hasExtension("GL_EXT_texture_format_BGRA8888")) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
ConfigInfo::kRenderable_Flag;
if (ctxInfo.hasExtension("GL_CHROMIUM_renderbuffer_format_BGRA8888") &&
(this->usesMSAARenderBuffers() || this->fMSFBOType == kMixedSamples_MSFBOType)) {
fConfigTable[kBGRA_8888_GrPixelConfig].fFlags |=
ConfigInfo::kRenderableWithMSAA_Flag;
}
}
}
if (texStorageSupported) {
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,
// *and* we can disable sRGB encode-on-write.
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
} else {
// See https://bug.skia.org/4148 for PowerVR issue.
fSRGBSupport = kPowerVRRogue_GrGLRenderer != ctxInfo.renderer() &&
(ctxInfo.version() >= GR_GL_VER(3,0) || ctxInfo.hasExtension("GL_EXT_sRGB"));
// ES through 3.1 requires EXT_srgb_write_control to support toggling
// sRGB writing for destinations.
fSRGBSupport = fSRGBSupport && ctxInfo.hasExtension("GL_EXT_sRGB_write_control");
}
if (!ctxInfo.hasExtension("GL_EXT_texture_sRGB_decode")) {
// To support "legacy" L32 mode, we require the ability to turn off sRGB decode:
fSRGBSupport = false;
}
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 |
allRenderFlags;
}
if (texStorageSupported) {
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) {
fConfigTable[kSBGRA_8888_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag |
allRenderFlags;
}
if (texStorageSupported) {
fConfigTable[kSBGRA_8888_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kSBGRA_8888_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
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_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();
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();
} 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();
}
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() || kDesktop_ARB_MSFBOType == this->msFBOType()) {
// desktop ARB extension/3.0+ supports ALPHA8 as renderable.
// Core profile removes ALPHA8 support, but we should have chosen R8 in that case.
fConfigTable[kAlpha_8_GrPixelConfig].fFlags |= allRenderFlags;
}
if (texStorageSupported) {
fConfigTable[kAlpha_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;
// for now we don't support floating point MSAA on ES
uint32_t fpRenderFlags = (kGL_GrGLStandard == standard) ?
allRenderFlags : (uint32_t)ConfigInfo::kRenderable_Flag;
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(3, 0) || ctxInfo.hasExtension("GL_ARB_texture_float")) {
hasFPTextures = true;
hasHalfFPTextures = true;
}
} else {
if (version >= GR_GL_VER(3, 1)) {
hasFPTextures = true;
hasHalfFPTextures = 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;
}
}
}
fConfigTable[kRGBA_float_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_RGBA;
fConfigTable[kRGBA_float_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_RGBA32F;
fConfigTable[kRGBA_float_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
GR_GL_RGBA;
fConfigTable[kRGBA_float_GrPixelConfig].fFormats.fExternalType = GR_GL_FLOAT;
fConfigTable[kRGBA_float_GrPixelConfig].fFormatType = kFloat_FormatType;
if (hasFPTextures) {
fConfigTable[kRGBA_float_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
// 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[kRGBA_float_GrPixelConfig].fFlags |= fpRenderFlags;
}
}
if (texStorageSupported) {
fConfigTable[kRGBA_float_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
fConfigTable[kRGBA_float_GrPixelConfig].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();
} 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();
}
if (kGL_GrGLStandard == ctxInfo.standard() || ctxInfo.version() >= GR_GL_VER(3, 0)) {
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 (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;
}
}
if (texStorageSupported) {
fConfigTable[kAlpha_half_GrPixelConfig].fFlags |= ConfigInfo::kCanUseTexStorage_Flag;
}
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;
if (kGL_GrGLStandard == ctxInfo.standard() || ctxInfo.version() >= GR_GL_VER(3, 0)) {
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;
}
fConfigTable[kRGBA_half_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
// Compressed texture support
// glCompressedTexImage2D is available on all OpenGL ES devices. It is available on standard
// OpenGL after version 1.3. We'll assume at least that level of OpenGL support.
// TODO: Fix command buffer bindings and remove this.
fCompressedTexSubImageSupport = SkToBool(gli->fFunctions.fCompressedTexSubImage2D);
// No sized/unsized internal format distinction for compressed formats, no external format.
// Below we set the external formats and types to 0.
fConfigTable[kIndex_8_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_PALETTE8_RGBA8;
fConfigTable[kIndex_8_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_PALETTE8_RGBA8;
fConfigTable[kIndex_8_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = 0;
fConfigTable[kIndex_8_GrPixelConfig].fFormats.fExternalType = 0;
fConfigTable[kIndex_8_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
// Disable this for now, while we investigate https://bug.skia.org/4333
if (false) {
// Check for 8-bit palette..
GrGLint numFormats;
GR_GL_GetIntegerv(gli, GR_GL_NUM_COMPRESSED_TEXTURE_FORMATS, &numFormats);
if (numFormats) {
SkAutoSTMalloc<10, GrGLint> formats(numFormats);
GR_GL_GetIntegerv(gli, GR_GL_COMPRESSED_TEXTURE_FORMATS, formats);
for (int i = 0; i < numFormats; ++i) {
if (GR_GL_PALETTE8_RGBA8 == formats[i]) {
fConfigTable[kIndex_8_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
break;
}
}
}
}
fConfigTable[kIndex_8_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
// May change the internal format based on extensions.
fConfigTable[kLATC_GrPixelConfig].fFormats.fBaseInternalFormat =
GR_GL_COMPRESSED_LUMINANCE_LATC1;
fConfigTable[kLATC_GrPixelConfig].fFormats.fSizedInternalFormat =
GR_GL_COMPRESSED_LUMINANCE_LATC1;
if (ctxInfo.hasExtension("GL_EXT_texture_compression_latc") ||
ctxInfo.hasExtension("GL_NV_texture_compression_latc")) {
fConfigTable[kLATC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
} else if ((kGL_GrGLStandard == standard && version >= GR_GL_VER(3, 0)) ||
ctxInfo.hasExtension("GL_EXT_texture_compression_rgtc") ||
ctxInfo.hasExtension("GL_ARB_texture_compression_rgtc")) {
// RGTC is identical and available on OpenGL 3.0+ as well as with extensions
fConfigTable[kLATC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
fConfigTable[kLATC_GrPixelConfig].fFormats.fBaseInternalFormat =
GR_GL_COMPRESSED_RED_RGTC1;
fConfigTable[kLATC_GrPixelConfig].fFormats.fSizedInternalFormat =
GR_GL_COMPRESSED_RED_RGTC1;
} else if (ctxInfo.hasExtension("GL_AMD_compressed_3DC_texture")) {
fConfigTable[kLATC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
fConfigTable[kLATC_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_COMPRESSED_3DC_X;
fConfigTable[kLATC_GrPixelConfig].fFormats.fSizedInternalFormat =
GR_GL_COMPRESSED_3DC_X;
}
fConfigTable[kLATC_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = 0;
fConfigTable[kLATC_GrPixelConfig].fFormats.fExternalType = 0;
fConfigTable[kLATC_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
fConfigTable[kLATC_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
fConfigTable[kETC1_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_COMPRESSED_ETC1_RGB8;
fConfigTable[kETC1_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_COMPRESSED_ETC1_RGB8;
fConfigTable[kETC1_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = 0;
fConfigTable[kETC1_GrPixelConfig].fFormats.fExternalType = 0;
fConfigTable[kETC1_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
if (kGL_GrGLStandard == standard) {
if (version >= GR_GL_VER(4, 3) || ctxInfo.hasExtension("GL_ARB_ES3_compatibility")) {
fConfigTable[kETC1_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
}
} else {
if (version >= GR_GL_VER(3, 0) ||
ctxInfo.hasExtension("GL_OES_compressed_ETC1_RGB8_texture") ||
// ETC2 is a superset of ETC1, so we can just check for that, too.
(ctxInfo.hasExtension("GL_OES_compressed_ETC2_RGB8_texture") &&
ctxInfo.hasExtension("GL_OES_compressed_ETC2_RGBA8_texture"))) {
fConfigTable[kETC1_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
}
}
fConfigTable[kETC1_GrPixelConfig].fSwizzle = GrSwizzle::RGBA();
fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fBaseInternalFormat = GR_GL_COMPRESSED_R11_EAC;
fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fSizedInternalFormat = GR_GL_COMPRESSED_R11_EAC;
fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] = 0;
fConfigTable[kR11_EAC_GrPixelConfig].fFormats.fExternalType = 0;
fConfigTable[kR11_EAC_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
// Check for R11_EAC. We don't support R11_EAC on desktop, as most cards default to
// decompressing the textures in the driver, and is generally slower.
if (kGLES_GrGLStandard == standard && version >= GR_GL_VER(3,0)) {
fConfigTable[kR11_EAC_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
}
fConfigTable[kR11_EAC_GrPixelConfig].fSwizzle = GrSwizzle::RRRR();
fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fBaseInternalFormat =
GR_GL_COMPRESSED_RGBA_ASTC_12x12;
fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fSizedInternalFormat =
GR_GL_COMPRESSED_RGBA_ASTC_12x12;
fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fExternalFormat[kOther_ExternalFormatUsage] =
0;
fConfigTable[kASTC_12x12_GrPixelConfig].fFormats.fExternalType = 0;
fConfigTable[kASTC_12x12_GrPixelConfig].fFormatType = kNormalizedFixedPoint_FormatType;
if (ctxInfo.hasExtension("GL_KHR_texture_compression_astc_hdr") ||
ctxInfo.hasExtension("GL_KHR_texture_compression_astc_ldr") ||
ctxInfo.hasExtension("GL_OES_texture_compression_astc")) {
fConfigTable[kASTC_12x12_GrPixelConfig].fFlags = ConfigInfo::kTextureable_Flag;
}
fConfigTable[kASTC_12x12_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) {
glslCaps->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) {
glslCaps->fConfigOutputSwizzle[i] = GrSwizzle::AAAA();
}
}
}
#ifdef SK_DEBUG
// Make sure we initialized everything.
ConfigInfo defaultEntry;
for (int i = 0; i < kGrPixelConfigCnt; ++i) {
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
}
void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}