| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "GrGLProgramDesc.h" |
| |
| #include "GrGLProcessor.h" |
| #include "GrProcessor.h" |
| #include "GrGLGpu.h" |
| #include "GrOptDrawState.h" |
| #include "SkChecksum.h" |
| #include "gl/builders/GrGLFragmentShaderBuilder.h" |
| |
| /** |
| * Do we need to either map r,g,b->a or a->r. configComponentMask indicates which channels are |
| * present in the texture's config. swizzleComponentMask indicates the channels present in the |
| * shader swizzle. |
| */ |
| static bool swizzle_requires_alpha_remapping(const GrGLCaps& caps, |
| uint32_t configComponentMask, |
| uint32_t swizzleComponentMask) { |
| if (caps.textureSwizzleSupport()) { |
| // Any remapping is handled using texture swizzling not shader modifications. |
| return false; |
| } |
| // check if the texture is alpha-only |
| if (kA_GrColorComponentFlag == configComponentMask) { |
| if (caps.textureRedSupport() && (kA_GrColorComponentFlag & swizzleComponentMask)) { |
| // we must map the swizzle 'a's to 'r'. |
| return true; |
| } |
| if (kRGB_GrColorComponentFlags & swizzleComponentMask) { |
| // The 'r', 'g', and/or 'b's must be mapped to 'a' according to our semantics that |
| // alpha-only textures smear alpha across all four channels when read. |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| static uint32_t gen_texture_key(const GrProcessor& proc, const GrGLCaps& caps) { |
| uint32_t key = 0; |
| int numTextures = proc.numTextures(); |
| for (int t = 0; t < numTextures; ++t) { |
| const GrTextureAccess& access = proc.textureAccess(t); |
| uint32_t configComponentMask = GrPixelConfigComponentMask(access.getTexture()->config()); |
| if (swizzle_requires_alpha_remapping(caps, configComponentMask, access.swizzleMask())) { |
| key |= 1 << t; |
| } |
| } |
| return key; |
| } |
| |
| /** |
| * A function which emits a meta key into the key builder. This is required because shader code may |
| * be dependent on properties of the effect that the effect itself doesn't use |
| * in its key (e.g. the pixel format of textures used). So we create a meta-key for |
| * every effect using this function. It is also responsible for inserting the effect's class ID |
| * which must be different for every GrProcessor subclass. It can fail if an effect uses too many |
| * textures, transforms, etc, for the space allotted in the meta-key. NOTE, both FPs and GPs share |
| * this function because it is hairy, though FPs do not have attribs, and GPs do not have transforms |
| */ |
| static bool get_meta_key(const GrProcessor& proc, |
| const GrGLCaps& caps, |
| uint32_t transformKey, |
| GrProcessorKeyBuilder* b) { |
| size_t processorKeySize = b->size(); |
| uint32_t textureKey = gen_texture_key(proc, caps); |
| uint32_t classID = proc.classID(); |
| |
| // Currently we allow 16 bits for each of the above portions of the meta-key. Fail if they |
| // don't fit. |
| static const uint32_t kMetaKeyInvalidMask = ~((uint32_t) SK_MaxU16); |
| if ((textureKey | transformKey | classID) & kMetaKeyInvalidMask) { |
| return false; |
| } |
| if (processorKeySize > SK_MaxU16) { |
| return false; |
| } |
| |
| uint32_t* key = b->add32n(2); |
| key[0] = (textureKey << 16 | transformKey); |
| key[1] = (classID << 16 | SkToU16(processorKeySize)); |
| return true; |
| } |
| |
| bool GrGLProgramDescBuilder::Build(const GrOptDrawState& optState, |
| const GrProgramDesc::DescInfo& descInfo, |
| GrGpu::DrawType drawType, |
| GrGLGpu* gpu, |
| GrProgramDesc* desc) { |
| // The descriptor is used as a cache key. Thus when a field of the |
| // descriptor will not affect program generation (because of the attribute |
| // bindings in use or other descriptor field settings) it should be set |
| // to a canonical value to avoid duplicate programs with different keys. |
| |
| GR_STATIC_ASSERT(0 == kProcessorKeysOffset % sizeof(uint32_t)); |
| // Make room for everything up to the effect keys. |
| desc->fKey.reset(); |
| desc->fKey.push_back_n(kProcessorKeysOffset); |
| |
| GrProcessorKeyBuilder b(&desc->fKey); |
| |
| const GrPrimitiveProcessor& primProc = *optState.getPrimitiveProcessor(); |
| primProc.getGLProcessorKey(optState.getBatchTracker(), gpu->glCaps(), &b); |
| if (!get_meta_key(primProc, gpu->glCaps(), 0, &b)) { |
| desc->fKey.reset(); |
| return false; |
| } |
| |
| for (int s = 0; s < optState.numFragmentStages(); ++s) { |
| const GrPendingFragmentStage& fps = optState.getFragmentStage(s); |
| const GrFragmentProcessor& fp = *fps.processor(); |
| fp.getGLProcessorKey(gpu->glCaps(), &b); |
| if (!get_meta_key(fp, gpu->glCaps(), primProc.getTransformKey(fp.coordTransforms()), &b)) { |
| desc->fKey.reset(); |
| return false; |
| } |
| } |
| |
| const GrXferProcessor& xp = *optState.getXferProcessor(); |
| xp.getGLProcessorKey(gpu->glCaps(), &b); |
| if (!get_meta_key(xp, gpu->glCaps(), 0, &b)) { |
| desc->fKey.reset(); |
| return false; |
| } |
| |
| // --------DO NOT MOVE HEADER ABOVE THIS LINE-------------------------------------------------- |
| // Because header is a pointer into the dynamic array, we can't push any new data into the key |
| // below here. |
| KeyHeader* header = desc->atOffset<KeyHeader, kHeaderOffset>(); |
| |
| // make sure any padding in the header is zeroed. |
| memset(header, 0, kHeaderSize); |
| |
| if (descInfo.fReadsDst) { |
| const GrDeviceCoordTexture* dstCopy = optState.getDstCopy(); |
| SkASSERT(dstCopy || gpu->caps()->dstReadInShaderSupport()); |
| const GrTexture* dstCopyTexture = NULL; |
| if (dstCopy) { |
| dstCopyTexture = dstCopy->texture(); |
| } |
| header->fDstReadKey = GrGLFragmentShaderBuilder::KeyForDstRead(dstCopyTexture, |
| gpu->glCaps()); |
| SkASSERT(0 != header->fDstReadKey); |
| } else { |
| header->fDstReadKey = 0; |
| } |
| |
| if (descInfo.fReadsFragPosition) { |
| header->fFragPosKey = |
| GrGLFragmentShaderBuilder::KeyForFragmentPosition(optState.getRenderTarget(), |
| gpu->glCaps()); |
| } else { |
| header->fFragPosKey = 0; |
| } |
| |
| header->fColorEffectCnt = optState.numColorStages(); |
| header->fCoverageEffectCnt = optState.numCoverageStages(); |
| desc->finalize(); |
| return true; |
| } |