Revert of Attach GrOptDrawState into shader building pipeline

src/gpu/gl/GrGLProgramDesc.cpp

 /*
  * 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 "GrDrawEffect.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,
@@ skipping 15 matching lines @@
         *effectKeySize = 0; // suppresses a warning.
         return false;
     }
     *effectKeySize = SkToU16(size);
     if (!GrGLProgramEffects::GenEffectMetaKey(drawEffect, caps, b)) {
         return false;
     }
     return true;
 }
 
-bool GrGLProgramDesc::Build(const GrOptDrawState& optState,
+bool GrGLProgramDesc::Build(const GrDrawState& drawState,
                             GrGpu::DrawType drawType,
+                            GrDrawState::BlendOptFlags blendOpts,
                             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();
+    // 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();
+            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();
+            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 = optState.hasColorVertexAttribute();
-    bool requiresCoverageAttrib = optState.hasCoverageVertexAttribute();
+    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 = optState.numTotalStages() > 0 &&
-                                    optState.hasLocalCoordAttribute();
+    bool requiresLocalCoordAttrib = !(skipCoverage  && skipColor) &&
+                                    drawState.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();
-
+    int numStages = 0;
+    if (drawState.hasGeometryProcessor()) {
+        numStages++;
+    }
+    if (!skipColor) {
+        numStages += drawState.numColorStages() - firstEffectiveColorStage;
+    }
+    if (!skipCoverage) {
+        numStages += drawState.numCoverageStages() - firstEffectiveCoverageStage;
+    }
     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()) {
+    if (drawState.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(),
+                                    *drawState.getGeometryProcessor(), gpu->glCaps(),
                                     requiresLocalCoordAttrib, &b,
                                     &effectKeySize, &readsDst,
                                     &readFragPosition, &requiresVertexShader);
             effectKeySuccess |= (effectOffset <= SK_MaxU16);
 
             offsetAndSize[0] = SkToU16(effectOffset);
             offsetAndSize[1] = effectKeySize;
             ++offsetAndSizeIndex;
-            *geometryProcessor = optState.getGeometryProcessor();
+            *geometryProcessor = drawState.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));
+    if (!skipColor) {
+        for (int s = firstEffectiveColorStage; s < drawState.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);
+            bool effectRequiresVertexShader = false;
+            GrEffectKeyBuilder b(&desc->fKey);
+            uint16_t effectKeySize;
+            uint32_t effectOffset = desc->fKey.count();
+            effectKeySuccess |= GetEffectKeyAndUpdateStats(
+                                    drawState.getColorStage(s), gpu->glCaps(),
+                                    requiresLocalCoordAttrib, &b,
+                                    &effectKeySize, &readsDst,
+                                    &readFragPosition, &effectRequiresVertexShader);
+            effectKeySuccess |= (effectOffset <= SK_MaxU16);
 
-        offsetAndSize[0] = SkToU16(effectOffset);
-        offsetAndSize[1] = effectKeySize;
-        ++offsetAndSizeIndex;
-        SkASSERT(!effectRequiresVertexShader);
+            offsetAndSize[0] = SkToU16(effectOffset);
+            offsetAndSize[1] = effectKeySize;
+            ++offsetAndSizeIndex;
+            SkASSERT(!effectRequiresVertexShader);
+        }
     }
+    if (!skipCoverage) {
+        for (int s = firstEffectiveCoverageStage; s < drawState.numCoverageStages(); ++s) {
+            uint16_t* offsetAndSize =
+                reinterpret_cast<uint16_t*>(desc->fKey.begin() + kEffectKeyOffsetsAndLengthOffset +
+                                            offsetAndSizeIndex * 2 * sizeof(uint16_t));
 
-    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(
+                                    drawState.getCoverageStage(s), gpu->glCaps(),
+                                    requiresLocalCoordAttrib, &b,
+                                    &effectKeySize, &readsDst,
+                                    &readFragPosition, &effectRequiresVertexShader);
+            effectKeySuccess |= (effectOffset <= SK_MaxU16);
 
-        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);
+            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) {
+    if (!inputColorIsUsed && !skipColor) {
         header->fColorInput = kAllOnes_ColorInput;
-    } else if (defaultToUniformInputs && !requiresColorAttrib) {
+    } else if (defaultToUniformInputs && !requiresColorAttrib && inputColorIsUsed) {
         header->fColorInput = kUniform_ColorInput;
     } else {
         header->fColorInput = kAttribute_ColorInput;
         header->fRequiresVertexShader = true;
     }
 
-    bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == optState.getCoverageColor();
+    bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverageColor();
 
-    if (covIsSolidWhite || !inputCoverageIsUsed) {
+    if ((covIsSolidWhite || !inputCoverageIsUsed) && !skipCoverage) {
         header->fCoverageInput = kAllOnes_ColorInput;
-    } else if (defaultToUniformInputs && !requiresCoverageAttrib) {
+    } else if (defaultToUniformInputs && !requiresCoverageAttrib && inputCoverageIsUsed) {
         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());
+                drawState.getRenderTarget(), gpu->glCaps());
     } else {
         header->fFragPosKey = 0;
     }
 
     // Record attribute indices
-    header->fPositionAttributeIndex = optState.positionAttributeIndex();
-    header->fLocalCoordAttributeIndex = optState.localCoordAttributeIndex();
+    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 = optState.getVertexAttribCount();
+    int availableAttributeIndex = drawState.getVertexAttribCount();
     if (requiresColorAttrib) {
-        header->fColorAttributeIndex = optState.colorVertexAttributeIndex();
+        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 = optState.coverageVertexAttributeIndex();
+        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 = optState.hasGeometryProcessor();
-    if (!optState.isCoverageDrawing() &&
-        (optState.numCoverageStages() > 0 ||
-         optState.hasGeometryProcessor() ||
+    bool separateCoverageFromColor = drawState.hasGeometryProcessor();
+    if (!drawState.isCoverageDrawing() && !skipCoverage &&
+        (drawState.numCoverageStages() > 0 ||
+         drawState.hasGeometryProcessor() ||
          requiresCoverageAttrib)) {
 
-        if (gpu->caps()->dualSourceBlendingSupport()) {
+        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;
         }
     }
 
-    for (int s = 0; s < optState.numColorStages(); ++s) {
-        colorStages->push_back(&optState.getColorStage(s));
+    if (!skipColor) {
+        for (int s = firstEffectiveColorStage; s < drawState.numColorStages(); ++s) {
+            colorStages->push_back(&drawState.getColorStage(s));
+        }
     }
-    SkTArray<const GrEffectStage*, true>* array;
-    if (separateCoverageFromColor) {
-        array = coverageStages;
-    } else {
-        array = colorStages;
+    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));
+        }
     }
-    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;
 }