Enable vertexless shading when path rendering is supported

src/gpu/gl/GrGLEffectMatrix.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLEffectMatrix.h"
 #include "GrDrawEffect.h"
 #include "GrTexture.h"
@@ skipping 30 matching lines @@
         key |= kIdentity_MatrixType;
     }
     return key;
 }
 
 GrSLType GrGLEffectMatrix::emitCode(GrGLShaderBuilder* builder,
                                     EffectKey key,
                                     SkString* fsCoordName,
                                     SkString* vsCoordName,
                                     const char* suffix) {
-    // TODO: Handle vertexless shaders here before we start enabling them.
-    GrGLShaderBuilder::VertexBuilder* vertexBuilder = builder->getVertexBuilder();
-    SkASSERT(NULL != vertexBuilder);
-
     GrSLType varyingType = kVoid_GrSLType;
     const char* uniName;
     key &= kKeyMask;
     switch (key & kMatrixTypeKeyMask) {
         case kIdentity_MatrixType:
             fUniType = kVoid_GrSLType;
             varyingType = kVec2f_GrSLType;
             break;
         case kTrans_MatrixType:
             fUniType = kVec2f_GrSLType;
             uniName = "StageTranslate";
             varyingType = kVec2f_GrSLType;
             break;
         case kNoPersp_MatrixType:
             fUniType = kMat33f_GrSLType;
             uniName = "StageMatrix";
             varyingType = kVec2f_GrSLType;
             break;
         case kGeneral_MatrixType:
             fUniType = kMat33f_GrSLType;
             uniName = "StageMatrix";
             varyingType = kVec3f_GrSLType;
             break;
         default:
             GrCrash("Unexpected key.");
     }
+
+    GrGLShaderBuilder::VertexBuilder* vertexBuilder = builder->getVertexBuilder();
+    if (NULL == vertexBuilder) {
+        if (vsCoordName) {
+            vsCoordName->reset();
+        }
+        builder->addTexGenUnit(varyingType, fsCoordName, &fTexGenUnit, &fNumTexGenComponents);
+        return varyingType;
+    }
+
     SkString suffixedUniName;
     if (NULL != suffix) {
         suffixedUniName.append(uniName);
         suffixedUniName.append(suffix);
         uniName = suffixedUniName.c_str();
     }
     if (kVoid_GrSLType != fUniType) {
         fUni = builder->addUniform(GrGLShaderBuilder::kVertex_Visibility,
                                    fUniType,
                                    uniName,
@@ skipping 95 matching lines @@
     }
     if (NULL != vsVaryingType) {
         *vsVaryingType = varyingType;
     }
 }
 
 void GrGLEffectMatrix::setData(const GrGLUniformManager& uniformManager,
                                const SkMatrix& matrix,
                                const GrDrawEffect& drawEffect,
                                const GrTexture* texture) {
-    SkASSERT(fUni.isValid() != (kVoid_GrSLType == fUniType));
+    SkASSERT(fUni.isValid() != (fTexGenUnit >= 0 || kVoid_GrSLType == fUniType));
     const SkMatrix& coordChangeMatrix = GrEffect::kLocal_CoordsType == fCoordsType ?
                                             drawEffect.getCoordChangeMatrix() :
                                             SkMatrix::I();
     switch (fUniType) {
         case kVoid_GrSLType:
             SkASSERT(matrix.isIdentity());
             SkASSERT(coordChangeMatrix.isIdentity());
             SkASSERT(NULL == texture || kTopLeft_GrSurfaceOrigin == texture->origin());
+            if (fTexGenUnit >= 0) {
+                SkASSERT(fNumTexGenComponents == 2);
+                GrGLfloat texgenCoefficients[] = {1, 0, 0,
+                                                  0, 1, 0};
+                uniformManager.enableGlobalTexGen(fTexGenUnit, 2, texgenCoefficients);
+            }
             return;
         case kVec2f_GrSLType: {
             SkASSERT(SkMatrix::kTranslate_Mask == (matrix.getType() | coordChangeMatrix.getType()));
             SkASSERT(NULL == texture || kTopLeft_GrSurfaceOrigin == texture->origin());
             SkScalar tx = matrix[SkMatrix::kMTransX] + (coordChangeMatrix)[SkMatrix::kMTransX];
             SkScalar ty = matrix[SkMatrix::kMTransY] + (coordChangeMatrix)[SkMatrix::kMTransY];
-            if (fPrevMatrix.get(SkMatrix::kMTransX) != tx ||
-                fPrevMatrix.get(SkMatrix::kMTransY) != ty) {
+            if (fTexGenUnit >= 0) {
+                SkASSERT(fNumTexGenComponents == 2);
+                GrGLfloat texgenCoefficients[] = {1, 0, SkScalarToFloat(tx),
+                                                  0, 1, SkScalarToFloat(ty)};
+                uniformManager.enableGlobalTexGen(fTexGenUnit, 2, texgenCoefficients);
+            } else if (fPrevMatrix.get(SkMatrix::kMTransX) != tx ||
+                       fPrevMatrix.get(SkMatrix::kMTransY) != ty) {
                 uniformManager.set2f(fUni, tx, ty);
                 fPrevMatrix.set(SkMatrix::kMTransX, tx);
                 fPrevMatrix.set(SkMatrix::kMTransY, ty);
             }
             break;
         }
         case kMat33f_GrSLType: {
             SkMatrix combined;
             combined.setConcat(matrix, coordChangeMatrix);
             if (NULL != texture && kBottomLeft_GrSurfaceOrigin == texture->origin()) {
                 // combined.postScale(1,-1);
                 // combined.postTranslate(0,1);
                 combined.set(SkMatrix::kMSkewY,
                     combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
                 combined.set(SkMatrix::kMScaleY,
                     combined[SkMatrix::kMPersp1] - combined[SkMatrix::kMScaleY]);
                 combined.set(SkMatrix::kMTransY,
                     combined[SkMatrix::kMPersp2] - combined[SkMatrix::kMTransY]);
             }
-            if (!fPrevMatrix.cheapEqualTo(combined)) {
+            if (fTexGenUnit >= 0) {
+                uniformManager.enableGlobalTexGen(fTexGenUnit, fNumTexGenComponents, combined);
+            } else if (!fPrevMatrix.cheapEqualTo(combined)) {
                 uniformManager.setSkMatrix(fUni, combined);
                 fPrevMatrix = combined;
             }
             break;
         }
         default:
             GrCrash("Unexpected uniform type.");
     }
 }