| /* |
| * 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 "gl/builders/GrGLProgramBuilder.h" |
| #include "GrGLProgramDesc.h" |
| #include "GrBackendEffectFactory.h" |
| #include "GrEffect.h" |
| #include "GrGpuGL.h" |
| #include "GrOptDrawState.h" |
| |
| #include "SkChecksum.h" |
| |
| bool GrGLProgramDesc::GetEffectKeyAndUpdateStats(const GrEffectStage& stage, |
| const GrGLCaps& caps, |
| bool useExplicitLocalCoords, |
| GrEffectKeyBuilder* b, |
| uint16_t* effectKeySize, |
| bool* setTrueIfReadsDst, |
| bool* setTrueIfReadsPos, |
| bool* setTrueIfRequiresVertexShader) { |
| const GrBackendEffectFactory& factory = stage.getEffect()->getFactory(); |
| const GrEffect& effect = *stage.getEffect(); |
| if (effect.willReadDstColor()) { |
| *setTrueIfReadsDst = true; |
| } |
| if (effect.willReadFragmentPosition()) { |
| *setTrueIfReadsPos = true; |
| } |
| if (effect.requiresVertexShader()) { |
| *setTrueIfRequiresVertexShader = true; |
| } |
| factory.getGLEffectKey(effect, caps, b); |
| size_t size = b->size(); |
| if (size > SK_MaxU16) { |
| *effectKeySize = 0; // suppresses a warning. |
| return false; |
| } |
| *effectKeySize = SkToU16(size); |
| if (!GrGLProgramEffects::GenEffectMetaKey(stage, |
| useExplicitLocalCoords, |
| caps, |
| b)) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool GrGLProgramDesc::Build(const GrOptDrawState& optState, |
| GrGpu::DrawType drawType, |
| GrBlendCoeff srcCoeff, |
| GrBlendCoeff dstCoeff, |
| const GrGpuGL* gpu, |
| const GrDeviceCoordTexture* dstCopy, |
| const GrEffectStage** geometryProcessor, |
| SkTArray<const GrEffectStage*, true>* colorStages, |
| SkTArray<const GrEffectStage*, true>* coverageStages, |
| GrGLProgramDesc* desc) { |
| colorStages->reset(); |
| coverageStages->reset(); |
| |
| bool inputColorIsUsed = optState.inputColorIsUsed(); |
| bool inputCoverageIsUsed = optState.inputColorIsUsed(); |
| |
| // 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. |
| |
| bool requiresColorAttrib = optState.hasColorVertexAttribute(); |
| bool requiresCoverageAttrib = optState.hasCoverageVertexAttribute(); |
| // we only need the local coords if we're actually going to generate effect code |
| bool requiresLocalCoordAttrib = optState.numTotalStages() > 0 && |
| optState.hasLocalCoordAttribute(); |
| |
| bool readsDst = false; |
| bool readFragPosition = false; |
| |
| // Provide option for shader programs without vertex shader only when drawing paths. |
| bool requiresVertexShader = !GrGpu::IsPathRenderingDrawType(drawType); |
| |
| int numStages = optState.numTotalStages(); |
| |
| GR_STATIC_ASSERT(0 == kEffectKeyOffsetsAndLengthOffset % sizeof(uint32_t)); |
| // Make room for everything up to and including the array of offsets to effect keys. |
| desc->fKey.reset(); |
| desc->fKey.push_back_n(kEffectKeyOffsetsAndLengthOffset + 2 * sizeof(uint16_t) * numStages); |
| |
| int offsetAndSizeIndex = 0; |
| bool effectKeySuccess = true; |
| |
| KeyHeader* header = desc->header(); |
| // make sure any padding in the header is zeroed. |
| memset(desc->header(), 0, kHeaderSize); |
| |
| // We can only have one effect which touches the vertex shader |
| if (optState.hasGeometryProcessor()) { |
| uint16_t* offsetAndSize = |
| reinterpret_cast<uint16_t*>(desc->fKey.begin() + kEffectKeyOffsetsAndLengthOffset + |
| offsetAndSizeIndex * 2 * sizeof(uint16_t)); |
| |
| GrEffectKeyBuilder b(&desc->fKey); |
| uint16_t effectKeySize; |
| uint32_t effectOffset = desc->fKey.count(); |
| effectKeySuccess |= GetEffectKeyAndUpdateStats( |
| *optState.getGeometryProcessor(), gpu->glCaps(), |
| requiresLocalCoordAttrib, &b, |
| &effectKeySize, &readsDst, |
| &readFragPosition, &requiresVertexShader); |
| effectKeySuccess |= (effectOffset <= SK_MaxU16); |
| |
| offsetAndSize[0] = SkToU16(effectOffset); |
| offsetAndSize[1] = effectKeySize; |
| ++offsetAndSizeIndex; |
| *geometryProcessor = optState.getGeometryProcessor(); |
| SkASSERT(requiresVertexShader); |
| header->fHasGeometryProcessor = true; |
| } |
| |
| for (int s = 0; s < optState.numColorStages(); ++s) { |
| uint16_t* offsetAndSize = |
| reinterpret_cast<uint16_t*>(desc->fKey.begin() + kEffectKeyOffsetsAndLengthOffset + |
| offsetAndSizeIndex * 2 * sizeof(uint16_t)); |
| |
| bool effectRequiresVertexShader = false; |
| GrEffectKeyBuilder b(&desc->fKey); |
| uint16_t effectKeySize; |
| uint32_t effectOffset = desc->fKey.count(); |
| effectKeySuccess |= GetEffectKeyAndUpdateStats( |
| optState.getColorStage(s), gpu->glCaps(), |
| requiresLocalCoordAttrib, &b, |
| &effectKeySize, &readsDst, |
| &readFragPosition, &effectRequiresVertexShader); |
| effectKeySuccess |= (effectOffset <= SK_MaxU16); |
| |
| offsetAndSize[0] = SkToU16(effectOffset); |
| offsetAndSize[1] = effectKeySize; |
| ++offsetAndSizeIndex; |
| SkASSERT(!effectRequiresVertexShader); |
| } |
| |
| for (int s = 0; s < optState.numCoverageStages(); ++s) { |
| uint16_t* offsetAndSize = |
| reinterpret_cast<uint16_t*>(desc->fKey.begin() + kEffectKeyOffsetsAndLengthOffset + |
| offsetAndSizeIndex * 2 * sizeof(uint16_t)); |
| |
| bool effectRequiresVertexShader = false; |
| GrEffectKeyBuilder b(&desc->fKey); |
| uint16_t effectKeySize; |
| uint32_t effectOffset = desc->fKey.count(); |
| effectKeySuccess |= GetEffectKeyAndUpdateStats( |
| optState.getCoverageStage(s), gpu->glCaps(), |
| requiresLocalCoordAttrib, &b, |
| &effectKeySize, &readsDst, |
| &readFragPosition, &effectRequiresVertexShader); |
| effectKeySuccess |= (effectOffset <= SK_MaxU16); |
| |
| offsetAndSize[0] = SkToU16(effectOffset); |
| offsetAndSize[1] = effectKeySize; |
| ++offsetAndSizeIndex; |
| SkASSERT(!effectRequiresVertexShader); |
| } |
| |
| if (!effectKeySuccess) { |
| desc->fKey.reset(); |
| return false; |
| } |
| |
| // Because header is a pointer into the dynamic array, we can't push any new data into the key |
| // below here. |
| |
| header->fRequiresVertexShader = requiresVertexShader || requiresLocalCoordAttrib; |
| header->fEmitsPointSize = GrGpu::kDrawPoints_DrawType == drawType; |
| |
| // Currently the experimental GS will only work with triangle prims (and it doesn't do anything |
| // other than pass through values from the VS to the FS anyway). |
| #if GR_GL_EXPERIMENTAL_GS |
| #if 0 |
| header->fExperimentalGS = gpu->caps().geometryShaderSupport(); |
| #else |
| header->fExperimentalGS = false; |
| #endif |
| #endif |
| bool defaultToUniformInputs = GR_GL_NO_CONSTANT_ATTRIBUTES || gpu->caps()->pathRenderingSupport(); |
| |
| if (!inputColorIsUsed) { |
| header->fColorInput = kAllOnes_ColorInput; |
| } else if (defaultToUniformInputs && !requiresColorAttrib) { |
| header->fColorInput = kUniform_ColorInput; |
| } else { |
| header->fColorInput = kAttribute_ColorInput; |
| header->fRequiresVertexShader = true; |
| } |
| |
| bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == optState.getCoverageColor(); |
| |
| if (covIsSolidWhite || !inputCoverageIsUsed) { |
| header->fCoverageInput = kAllOnes_ColorInput; |
| } else if (defaultToUniformInputs && !requiresCoverageAttrib) { |
| header->fCoverageInput = kUniform_ColorInput; |
| } else { |
| header->fCoverageInput = kAttribute_ColorInput; |
| header->fRequiresVertexShader = true; |
| } |
| |
| if (readsDst) { |
| 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 (readFragPosition) { |
| header->fFragPosKey = GrGLFragmentShaderBuilder::KeyForFragmentPosition( |
| optState.getRenderTarget(), gpu->glCaps()); |
| } else { |
| header->fFragPosKey = 0; |
| } |
| |
| // Record attribute indices |
| header->fPositionAttributeIndex = optState.positionAttributeIndex(); |
| header->fLocalCoordAttributeIndex = optState.localCoordAttributeIndex(); |
| |
| // For constant color and coverage we need an attribute with an index beyond those already set |
| int availableAttributeIndex = optState.getVertexAttribCount(); |
| if (requiresColorAttrib) { |
| header->fColorAttributeIndex = optState.colorVertexAttributeIndex(); |
| } else if (GrGLProgramDesc::kAttribute_ColorInput == header->fColorInput) { |
| SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt); |
| header->fColorAttributeIndex = availableAttributeIndex; |
| availableAttributeIndex++; |
| } else { |
| header->fColorAttributeIndex = -1; |
| } |
| |
| if (requiresCoverageAttrib) { |
| header->fCoverageAttributeIndex = optState.coverageVertexAttributeIndex(); |
| } else if (GrGLProgramDesc::kAttribute_ColorInput == header->fCoverageInput) { |
| SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt); |
| header->fCoverageAttributeIndex = availableAttributeIndex; |
| } else { |
| header->fCoverageAttributeIndex = -1; |
| } |
| |
| // Here we deal with whether/how we handle color and coverage separately. |
| |
| // Set this default and then possibly change our mind if there is coverage. |
| header->fCoverageOutput = kModulate_CoverageOutput; |
| |
| // If we do have coverage determine whether it matters. |
| bool separateCoverageFromColor = optState.hasGeometryProcessor(); |
| if (!optState.isCoverageDrawing() && |
| (optState.numCoverageStages() > 0 || |
| optState.hasGeometryProcessor() || |
| requiresCoverageAttrib)) { |
| |
| if (gpu->caps()->dualSourceBlendingSupport()) { |
| if (kZero_GrBlendCoeff == dstCoeff) { |
| // write the coverage value to second color |
| header->fCoverageOutput = kSecondaryCoverage_CoverageOutput; |
| separateCoverageFromColor = true; |
| } else if (kSA_GrBlendCoeff == dstCoeff) { |
| // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered. |
| header->fCoverageOutput = kSecondaryCoverageISA_CoverageOutput; |
| separateCoverageFromColor = true; |
| } else if (kSC_GrBlendCoeff == dstCoeff) { |
| // SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered. |
| header->fCoverageOutput = kSecondaryCoverageISC_CoverageOutput; |
| separateCoverageFromColor = true; |
| } |
| } else if (readsDst && |
| kOne_GrBlendCoeff == srcCoeff && |
| kZero_GrBlendCoeff == dstCoeff) { |
| header->fCoverageOutput = kCombineWithDst_CoverageOutput; |
| separateCoverageFromColor = true; |
| } |
| } |
| |
| for (int s = 0; s < optState.numColorStages(); ++s) { |
| colorStages->push_back(&optState.getColorStage(s)); |
| } |
| SkTArray<const GrEffectStage*, true>* array; |
| if (separateCoverageFromColor) { |
| array = coverageStages; |
| } else { |
| array = colorStages; |
| } |
| for (int s = 0; s < optState.numCoverageStages(); ++s) { |
| array->push_back(&optState.getCoverageStage(s)); |
| } |
| |
| header->fColorEffectCnt = colorStages->count(); |
| header->fCoverageEffectCnt = coverageStages->count(); |
| |
| desc->finalize(); |
| return true; |
| } |
| |
| void GrGLProgramDesc::finalize() { |
| int keyLength = fKey.count(); |
| SkASSERT(0 == (keyLength % 4)); |
| *this->atOffset<uint32_t, kLengthOffset>() = SkToU32(keyLength); |
| |
| uint32_t* checksum = this->atOffset<uint32_t, kChecksumOffset>(); |
| *checksum = 0; |
| *checksum = SkChecksum::Compute(reinterpret_cast<uint32_t*>(fKey.begin()), keyLength); |
| } |
| |
| GrGLProgramDesc& GrGLProgramDesc::operator= (const GrGLProgramDesc& other) { |
| size_t keyLength = other.keyLength(); |
| fKey.reset(keyLength); |
| memcpy(fKey.begin(), other.fKey.begin(), keyLength); |
| return *this; |
| } |