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/*
* 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) {
const GrEffectRef& effect = *stage.getEffect();
const GrBackendEffectFactory& factory = effect->getFactory();
GrDrawEffect drawEffect(stage, useExplicitLocalCoords);
if (effect->willReadDstColor()) {
*setTrueIfReadsDst = true;
}
if (effect->willReadFragmentPosition()) {
*setTrueIfReadsPos = true;
}
return factory.glEffectKey(drawEffect, caps);
}
}
void GrGLProgramDesc::Build(const GrDrawState& drawState,
bool isPoints,
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
GrAssert(!(GrDrawState::kSkipDraw_BlendOptFlag & blendOpts));
bool skipCoverage = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool skipColor = SkToBool(blendOpts & (GrDrawState::kEmitTransBlack_BlendOptFlag |
GrDrawState::kEmitCoverage_BlendOptFlag));
// 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());
int numEffects = (skipColor ? 0 : drawState.numColorStages()) +
(skipCoverage ? 0 : drawState.numCoverageStages());
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>() = newKeyLength;
KeyHeader* header = desc->header();
EffectKey* effectKeys = desc->effectKeys();
int currEffectKey = 0;
bool readsDst = false;
bool readFragPosition = false;
if (!skipColor) {
for (int s = 0; s < drawState.numColorStages(); ++s) {
effectKeys[currEffectKey++] =
get_key_and_update_stats(drawState.getColorStage(s), gpu->glCaps(),
requiresLocalCoordAttrib, &readsDst, &readFragPosition);
}
}
if (!skipCoverage) {
for (int s = 0; s < drawState.numCoverageStages(); ++s) {
effectKeys[currEffectKey++] =
get_key_and_update_stats(drawState.getCoverageStage(s), gpu->glCaps(),
requiresLocalCoordAttrib, &readsDst, &readFragPosition);
}
}
header->fEmitsPointSize = isPoints;
header->fColorFilterXfermode = skipColor ? SkXfermode::kDst_Mode : drawState.getColorFilterMode();
// 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
if (colorIsTransBlack) {
header->fColorInput = kTransBlack_ColorInput;
} else if (colorIsSolidWhite) {
header->fColorInput = kSolidWhite_ColorInput;
} else if (GR_GL_NO_CONSTANT_ATTRIBUTES && !requiresColorAttrib) {
header->fColorInput = kUniform_ColorInput;
} else {
header->fColorInput = kAttribute_ColorInput;
}
bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverage();
if (skipCoverage) {
header->fCoverageInput = kTransBlack_ColorInput;
} else if (covIsSolidWhite) {
header->fCoverageInput = kSolidWhite_ColorInput;
} else if (GR_GL_NO_CONSTANT_ATTRIBUTES && !requiresCoverageAttrib) {
header->fCoverageInput = kUniform_ColorInput;
} else {
header->fCoverageInput = kAttribute_ColorInput;
}
if (readsDst) {
GrAssert(NULL != dstCopy || gpu->caps()->dstReadInShaderSupport());
const GrTexture* dstCopyTexture = NULL;
if (NULL != dstCopy) {
dstCopyTexture = dstCopy->texture();
}
header->fDstReadKey = GrGLShaderBuilder::KeyForDstRead(dstCopyTexture, gpu->glCaps());
GrAssert(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) {
GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
header->fColorAttributeIndex = availableAttributeIndex;
availableAttributeIndex++;
} else {
header->fColorAttributeIndex = -1;
}
if (requiresCoverageAttrib) {
header->fCoverageAttributeIndex = drawState.coverageVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == header->fCoverageInput) {
GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
header->fCoverageAttributeIndex = availableAttributeIndex;
} else {
header->fCoverageAttributeIndex = -1;
}
// Here we deal with whether/how we handle color and coverage separately.
// Set these defaults and then possibly change our mind if there is coverage.
header->fDiscardIfZeroCoverage = false;
header->fCoverageOutput = kModulate_CoverageOutput;
// If we do have coverage determine whether it matters.
bool separateCoverageFromColor = false;
if (!drawState.isCoverageDrawing() && !skipCoverage &&
(drawState.numCoverageStages() > 0 || requiresCoverageAttrib)) {
// color filter is applied between color/coverage computation
if (SkXfermode::kDst_Mode != header->fColorFilterXfermode) {
separateCoverageFromColor = true;
}
// If we're stenciling then we want to discard samples that have zero coverage
if (drawState.getStencil().doesWrite()) {
header->fDiscardIfZeroCoverage = true;
separateCoverageFromColor = true;
}
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 = 0; s < drawState.numColorStages(); ++s) {
colorStages->push_back(&drawState.getColorStage(s));
}
header->fColorEffectCnt = drawState.numColorStages();
}
if (!skipCoverage) {
SkTArray<const GrEffectStage*, true>* array;
if (separateCoverageFromColor) {
array = coverageStages;
header->fCoverageEffectCnt = drawState.numCoverageStages();
} else {
array = colorStages;
header->fColorEffectCnt += drawState.numCoverageStages();
}
for (int s = 0; s < drawState.numCoverageStages(); ++s) {
array->push_back(&drawState.getCoverageStage(s));
}
}
*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;
}
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