Mark when effects and programs have vertex code

Adds a 'hasVertexCode' method to GrEffect and a 'fHasVertexCode' field
to GrGLProgramDesc::KeyHeader. Also adds a GrVertexEffect class that
effects have to inherit from in order to set the 'hasVertexCode' flag
and be able to emit vertex code, and updates the existing effects to
use it as needed.

R=bsalomon@google.com

Author: cdalton@nvidia.com

Review URL: https://codereview.chromium.org/23653059

git-svn-id: http://skia.googlecode.com/svn/trunk@11537 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 13 insertions, 3 deletions

diff --git a/src/gpu/gl/GrGLProgramDesc.cpp b/src/gpu/gl/GrGLProgramDesc.cpp
index 91ac266093..8b731fbc2c 100644
--- a/src/gpu/gl/GrGLProgramDesc.cpp
+++ b/src/gpu/gl/GrGLProgramDesc.cpp
@@ -19,7 +19,8 @@ inline GrGLEffect::EffectKey get_key_and_update_stats(const GrEffectStage& stage
                                                       const GrGLCaps& caps,
                                                       bool useExplicitLocalCoords,
                                                       bool* setTrueIfReadsDst,
-                                                      bool* setTrueIfReadsPos) {
+                                                      bool* setTrueIfReadsPos,
+                                                      bool* setTrueIfHasVertexCode) {
     const GrEffectRef& effect = *stage.getEffect();
     const GrBackendEffectFactory& factory = effect->getFactory();
     GrDrawEffect drawEffect(stage, useExplicitLocalCoords);
@@ -29,6 +30,9 @@ inline GrGLEffect::EffectKey get_key_and_update_stats(const GrEffectStage& stage
     if (effect->willReadFragmentPosition()) {
         *setTrueIfReadsPos = true;
     }
+    if (effect->hasVertexCode()) {
+        *setTrueIfHasVertexCode = true;
+    }
     return factory.glEffectKey(drawEffect, caps);
 }
 }
@@ -87,21 +91,25 @@ void GrGLProgramDesc::Build(const GrDrawState& drawState,
     int currEffectKey = 0;
     bool readsDst = false;
     bool readFragPosition = false;
+    bool hasVertexCode = 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);
+                                         requiresLocalCoordAttrib, &readsDst, &readFragPosition,
+                                         &hasVertexCode);
         }
     }
     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);
+                                         requiresLocalCoordAttrib, &readsDst, &readFragPosition,
+                                         &hasVertexCode);
         }
     }
 
+    header->fHasVertexCode = hasVertexCode || requiresLocalCoordAttrib;
     header->fEmitsPointSize = isPoints;
     header->fColorFilterXfermode = skipColor ? SkXfermode::kDst_Mode : drawState.getColorFilterMode();
 
@@ -122,6 +130,7 @@ void GrGLProgramDesc::Build(const GrDrawState& drawState,
         header->fColorInput = kUniform_ColorInput;
     } else {
         header->fColorInput = kAttribute_ColorInput;
+        header->fHasVertexCode = true;
     }
 
     bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverage();
@@ -134,6 +143,7 @@ void GrGLProgramDesc::Build(const GrDrawState& drawState,
         header->fCoverageInput = kUniform_ColorInput;
     } else {
         header->fCoverageInput = kAttribute_ColorInput;
+        header->fHasVertexCode = true;
     }
 
     if (readsDst) {