Add GrEllipseEdgeEffect

src/gpu/GrDrawState.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 "GrDrawState.h"
 #include "GrPaint.h"
 
@@ skipping 115 matching lines @@
     fVertexAttribs.reset();
     fVertexAttribs.push_back(kPositionAttrib);
 
     fCommon.fAttribBindings = kDefault_AttribBindings;
 
     fAttribIndices[kPosition_AttribIndex] = 0;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
+bool GrDrawState::validateVertexAttribs() const {
+    // color and coverage can set indices beyond the standard count
+    static const int kMaxValidAttribIndex = kVertexAttribCnt+2;
+    int attributeTypes[kMaxValidAttribIndex];
+    for (int i = 0; i < kMaxValidAttribIndex; ++i) {
+        attributeTypes[i] = -1;
+    }
+
+    // sentinel to make sure effects don't try to use built-in attributes
+    static const int kBuiltInAttributeType = 10000; 
+
+    // check our built-in indices
+    if (fAttribIndices[kPosition_AttribIndex] >= kVertexAttribCnt) {
+        return false;
+    }
+    attributeTypes[fAttribIndices[kPosition_AttribIndex]] = kBuiltInAttributeType;
+    for (int j = kColor_AttribIndex; j <= kCoverage_AttribIndex; ++j) {
+        if (fCommon.fAttribBindings & kAttribIndexMasks[j]) {
+            int attributeIndex = fAttribIndices[j];
+            if (attributeIndex >= kMaxValidAttribIndex) {
+                return false;
+            }
+            // they should not be shared at all
+            if (attributeTypes[attributeIndex] != -1) {
+                return false;
+            }
+            attributeTypes[attributeIndex] = kBuiltInAttributeType;
+        }
+    }
+    for (int j = kEdge_AttribIndex; j < kAttribIndexCount; ++j) {
+        if (fCommon.fAttribBindings & kAttribIndexMasks[j]) {
+            int attributeIndex = fAttribIndices[j];
+            if (attributeIndex >= kVertexAttribCnt) {
+                return false;
+            }
+            // they should not be shared at all
+            if (attributeTypes[attributeIndex] != -1) {
+                return false;
+            }
+            attributeTypes[attributeIndex] = kBuiltInAttributeType;
+        }
+    }
+
+    // now those set by effects
+    for (int s = 0; s < kNumStages; ++s) { 
+        const GrEffectStage& stage = fStages[s];
+        const GrEffectRef* effect = stage.getEffect();
+        if (effect == NULL) {
+            continue;
+        }
+
+        // make sure that the count in the stage and the effect matches
+        int numAttributes = stage.getVertexAttribIndexCount();
+        if (numAttributes != effect->get()->numVertexAttribs()) {
+            return false;
+        }
+
+        // make sure that any shared indices have the same type
+        const int* attributeIndices = stage.getVertexAttribIndices();
+        for (int i = 0; i < numAttributes; ++i) {
+            int attributeIndex = attributeIndices[i];
+            if (attributeIndex >= kVertexAttribCnt) {
+                return false;
+            }
+
+            GrSLType attributeType = effect->get()->vertexAttribType(i);
+            if (attributeTypes[attributeIndex] != -1 && 
+                attributeTypes[attributeIndex] != attributeType) {
+                return false;
+            }
+            attributeTypes[attributeIndex] = attributeType;
+        }
+    }
+
+    return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
 bool GrDrawState::AttributesBindExplicitTexCoords(GrAttribBindings attribBindings) {
     return SkToBool(kTexCoord_AttribBindingsMask & attribBindings);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 void GrDrawState::VertexAttributesUnitTest() {
     // Ensure that our tex coord mask is correct
     GrAttribBindings texCoordMask;
     gen_tex_coord_mask(&texCoordMask);
@@ skipping 337 matching lines @@
             }
             fRestoreMask |= (1 << s);
             GrEffectStage* stage = drawState->fStages + s;
             stage->saveCoordChange(&fSavedCoordChanges[s]);
             stage->preConcatCoordChange(invVM);
         }
     }
     drawState->viewMatrix()->reset();
     return true;
 }