| /* | |
| * 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 "GrBackendEffectFactory.h" | |
| #include "GrDrawEffect.h" | |
| #include "GrEffect.h" | |
| #include "GrGLShaderBuilder.h" | |
| #include "GrGpuGL.h" | |
| #include "SkChecksum.h" | |
| namespace { | |
| inline GrGLEffect::EffectKey get_key_and_update_stats(const GrEffectStage& stage, | |
| const GrGLCaps& caps, | |
| bool useExplicitLocalCoords, | |
| bool* setTrueIfReadsDst, | |
| bool* setTrueIfReadsPos, | |
| bool* setTrueIfHasVertexCode) { | |
| const GrEffectRef& effect = *stage.getEffect(); | |
| const GrBackendEffectFactory& factory = effect->getFactory(); | |
| GrDrawEffect drawEffect(stage, useExplicitLocalCoords); | |
| if (effect->willReadDstColor()) { | |
| *setTrueIfReadsDst = true; | |
| } | |
| if (effect->willReadFragmentPosition()) { | |
| *setTrueIfReadsPos = true; | |
| } | |
| if (effect->hasVertexCode()) { | |
| *setTrueIfHasVertexCode = true; | |
| } | |
| return factory.glEffectKey(drawEffect, caps); | |
| } | |
| } | |
| void GrGLProgramDesc::Build(const GrDrawState& drawState, | |
| GrGpu::DrawType drawType, | |
| GrDrawState::BlendOptFlags blendOpts, | |
| GrBlendCoeff srcCoeff, | |
| GrBlendCoeff dstCoeff, | |
| const GrGpuGL* gpu, | |
| const GrDeviceCoordTexture* dstCopy, | |
| SkTArray<const GrEffectStage*, true>* colorStages, | |
| SkTArray<const GrEffectStage*, true>* coverageStages, | |
| GrGLProgramDesc* desc) { | |
| colorStages->reset(); | |
| coverageStages->reset(); | |
| // This should already have been caught | |
| SkASSERT(!(GrDrawState::kSkipDraw_BlendOptFlag & blendOpts)); | |
| bool skipCoverage = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag); | |
| bool skipColor = SkToBool(blendOpts & (GrDrawState::kEmitTransBlack_BlendOptFlag | | |
| GrDrawState::kEmitCoverage_BlendOptFlag)); | |
| int firstEffectiveColorStage = 0; | |
| bool inputColorIsUsed = true; | |
| if (!skipColor) { | |
| firstEffectiveColorStage = drawState.numColorStages(); | |
| while (firstEffectiveColorStage > 0 && inputColorIsUsed) { | |
| --firstEffectiveColorStage; | |
| const GrEffect* effect = drawState.getColorStage(firstEffectiveColorStage).getEffect()->get(); | |
| inputColorIsUsed = effect->willUseInputColor(); | |
| } | |
| } | |
| int firstEffectiveCoverageStage = 0; | |
| bool inputCoverageIsUsed = true; | |
| if (!skipCoverage) { | |
| firstEffectiveCoverageStage = drawState.numCoverageStages(); | |
| while (firstEffectiveCoverageStage > 0 && inputCoverageIsUsed) { | |
| --firstEffectiveCoverageStage; | |
| const GrEffect* effect = drawState.getCoverageStage(firstEffectiveCoverageStage).getEffect()->get(); | |
| inputCoverageIsUsed = effect->willUseInputColor(); | |
| } | |
| } | |
| // 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 = !skipColor && drawState.hasColorVertexAttribute(); | |
| bool requiresCoverageAttrib = !skipCoverage && drawState.hasCoverageVertexAttribute(); | |
| // we only need the local coords if we're actually going to generate effect code | |
| bool requiresLocalCoordAttrib = !(skipCoverage && skipColor) && | |
| drawState.hasLocalCoordAttribute(); | |
| bool colorIsTransBlack = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag); | |
| bool colorIsSolidWhite = (blendOpts & GrDrawState::kEmitCoverage_BlendOptFlag) || | |
| (!requiresColorAttrib && 0xffffffff == drawState.getColor()) || | |
| (!inputColorIsUsed); | |
| int numEffects = (skipColor ? 0 : (drawState.numColorStages() - firstEffectiveColorStage)) + | |
| (skipCoverage ? 0 : (drawState.numCoverageStages() - firstEffectiveCoverageStage)); | |
| size_t newKeyLength = KeyLength(numEffects); | |
| bool allocChanged; | |
| desc->fKey.reset(newKeyLength, SkAutoMalloc::kAlloc_OnShrink, &allocChanged); | |
| if (allocChanged || !desc->fInitialized) { | |
| // make sure any padding in the header is zero if we we haven't used this allocation before. | |
| memset(desc->header(), 0, kHeaderSize); | |
| } | |
| // write the key length | |
| *desc->atOffset<uint32_t, kLengthOffset>() = SkToU32(newKeyLength); | |
| KeyHeader* header = desc->header(); | |
| EffectKey* effectKeys = desc->effectKeys(); | |
| int currEffectKey = 0; | |
| bool readsDst = false; | |
| bool readFragPosition = false; | |
| // We use vertexshader-less shader programs only when drawing paths. | |
| bool hasVertexCode = !(GrGpu::kDrawPath_DrawType == drawType || | |
| GrGpu::kDrawPaths_DrawType == drawType); | |
| if (!skipColor) { | |
| for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) { | |
| effectKeys[currEffectKey++] = | |
| get_key_and_update_stats(drawState.getColorStage(s), gpu->glCaps(), | |
| requiresLocalCoordAttrib, &readsDst, &readFragPosition, | |
| &hasVertexCode); | |
| } | |
| } | |
| if (!skipCoverage) { | |
| for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) { | |
| effectKeys[currEffectKey++] = | |
| get_key_and_update_stats(drawState.getCoverageStage(s), gpu->glCaps(), | |
| requiresLocalCoordAttrib, &readsDst, &readFragPosition, | |
| &hasVertexCode); | |
| } | |
| } | |
| header->fHasVertexCode = hasVertexCode || 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 (colorIsTransBlack) { | |
| header->fColorInput = kTransBlack_ColorInput; | |
| } else if (colorIsSolidWhite) { | |
| header->fColorInput = kSolidWhite_ColorInput; | |
| } else if (defaultToUniformInputs && !requiresColorAttrib) { | |
| header->fColorInput = kUniform_ColorInput; | |
| } else { | |
| header->fColorInput = kAttribute_ColorInput; | |
| header->fHasVertexCode = true; | |
| } | |
| bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverageColor(); | |
| if (skipCoverage) { | |
| header->fCoverageInput = kTransBlack_ColorInput; | |
| } else if (covIsSolidWhite || !inputCoverageIsUsed) { | |
| header->fCoverageInput = kSolidWhite_ColorInput; | |
| } else if (defaultToUniformInputs && !requiresCoverageAttrib) { | |
| header->fCoverageInput = kUniform_ColorInput; | |
| } else { | |
| header->fCoverageInput = kAttribute_ColorInput; | |
| header->fHasVertexCode = true; | |
| } | |
| if (readsDst) { | |
| SkASSERT(NULL != dstCopy || gpu->caps()->dstReadInShaderSupport()); | |
| const GrTexture* dstCopyTexture = NULL; | |
| if (NULL != dstCopy) { | |
| dstCopyTexture = dstCopy->texture(); | |
| } | |
| header->fDstReadKey = GrGLShaderBuilder::KeyForDstRead(dstCopyTexture, gpu->glCaps()); | |
| SkASSERT(0 != header->fDstReadKey); | |
| } else { | |
| header->fDstReadKey = 0; | |
| } | |
| if (readFragPosition) { | |
| header->fFragPosKey = GrGLShaderBuilder::KeyForFragmentPosition(drawState.getRenderTarget(), | |
| gpu->glCaps()); | |
| } else { | |
| header->fFragPosKey = 0; | |
| } | |
| // Record attribute indices | |
| header->fPositionAttributeIndex = drawState.positionAttributeIndex(); | |
| header->fLocalCoordAttributeIndex = drawState.localCoordAttributeIndex(); | |
| // For constant color and coverage we need an attribute with an index beyond those already set | |
| int availableAttributeIndex = drawState.getVertexAttribCount(); | |
| if (requiresColorAttrib) { | |
| header->fColorAttributeIndex = drawState.colorVertexAttributeIndex(); | |
| } else if (GrGLProgramDesc::kAttribute_ColorInput == header->fColorInput) { | |
| SkASSERT(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt); | |
| header->fColorAttributeIndex = availableAttributeIndex; | |
| availableAttributeIndex++; | |
| } else { | |
| header->fColorAttributeIndex = -1; | |
| } | |
| if (requiresCoverageAttrib) { | |
| header->fCoverageAttributeIndex = drawState.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 = false; | |
| if (!drawState.isCoverageDrawing() && !skipCoverage && | |
| (drawState.numCoverageStages() > 0 || requiresCoverageAttrib)) { | |
| if (gpu->caps()->dualSourceBlendingSupport() && | |
| !(blendOpts & (GrDrawState::kEmitCoverage_BlendOptFlag | | |
| GrDrawState::kCoverageAsAlpha_BlendOptFlag))) { | |
| 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; | |
| } | |
| } | |
| if (!skipColor) { | |
| for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) { | |
| colorStages->push_back(&drawState.getColorStage(s)); | |
| } | |
| } | |
| if (!skipCoverage) { | |
| SkTArray<const GrEffectStage*, true>* array; | |
| if (separateCoverageFromColor) { | |
| array = coverageStages; | |
| } else { | |
| array = colorStages; | |
| } | |
| for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) { | |
| array->push_back(&drawState.getCoverageStage(s)); | |
| } | |
| } | |
| header->fColorEffectCnt = colorStages->count(); | |
| header->fCoverageEffectCnt = coverageStages->count(); | |
| *desc->checksum() = 0; | |
| *desc->checksum() = SkChecksum::Compute(reinterpret_cast<uint32_t*>(desc->fKey.get()), | |
| newKeyLength); | |
| desc->fInitialized = true; | |
| } | |
| GrGLProgramDesc& GrGLProgramDesc::operator= (const GrGLProgramDesc& other) { | |
| fInitialized = other.fInitialized; | |
| if (fInitialized) { | |
| size_t keyLength = other.keyLength(); | |
| fKey.reset(keyLength); | |
| memcpy(fKey.get(), other.fKey.get(), keyLength); | |
| } | |
| return *this; | |
| } |