Initial change to create GeometryProcessor

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"
@@ skipping 35 matching lines @@
     return true;
 }
 
 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();
 
     // 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;
@@ skipping 18 matching lines @@
     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 = 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 (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(
+                                    *drawState.getGeometryProcessor(), gpu->glCaps(),
+                                    requiresLocalCoordAttrib, &b,
+                                    &effectKeySize, &readsDst,
+                                    &readFragPosition, &requiresVertexShader);
+            effectKeySuccess |= (effectOffset <= SK_MaxU16);
+
+            offsetAndSize[0] = SkToU16(effectOffset);
+            offsetAndSize[1] = effectKeySize;
+            ++offsetAndSizeIndex;
+            *geometryProcessor = drawState.getGeometryProcessor();
+            SkASSERT(requiresVertexShader);
+            header->fHasGeometryProcessor = true;
+    }
+
     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(
                                     drawState.getColorStage(s), gpu->glCaps(),
                                     requiresLocalCoordAttrib, &b,
                                     &effectKeySize, &readsDst,
-                                    &readFragPosition, &requiresVertexShader);
+                                    &readFragPosition, &effectRequiresVertexShader);
             effectKeySuccess |= (effectOffset <= SK_MaxU16);
 
             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));
 
+            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, &requiresVertexShader);
+                                    &readFragPosition, &effectRequiresVertexShader);
             effectKeySuccess |= (effectOffset <= SK_MaxU16);
 
             offsetAndSize[0] = SkToU16(effectOffset);
             offsetAndSize[1] = effectKeySize;
             ++offsetAndSizeIndex;
+            SkASSERT(!effectRequiresVertexShader);
         }
     }
     if (!effectKeySuccess) {
         desc->fKey.reset();
         return false;
     }
 
-    KeyHeader* header = desc->header();
-    // make sure any padding in the header is zeroed.
-    memset(desc->header(), 0, kHeaderSize);
-
     // 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
@@ skipping 68 matching lines @@
     } 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;
+    bool separateCoverageFromColor = drawState.hasGeometryProcessor();
     if (!drawState.isCoverageDrawing() && !skipCoverage &&
-        (drawState.numCoverageStages() > 0 || requiresCoverageAttrib)) {
+        (drawState.numCoverageStages() > 0 ||
+         drawState.hasGeometryProcessor() ||
+         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 {
@@ skipping 19 matching lines @@
     *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;
 }