Removing vertex attrib indices

src/gpu/effects/GrGeometryProcessor.h

Index: src/gpu/effects/GrGeometryProcessor.h
diff --git a/src/gpu/effects/GrGeometryProcessor.h b/src/gpu/effects/GrGeometryProcessor.h
new file mode 100644
index 0000000000000000000000000000000000000000..0e1c80c150aefc76632764daed8af4c090814249
--- /dev/null
+++ b/src/gpu/effects/GrGeometryProcessor.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrGeometryProcessor_DEFINED
+#define GrGeometryProcessor_DEFINED
+
+#include "GrEffect.h"
+
+/**
+ * If an effect needs specialized vertex shader code, then it must inherit from this class.
+ * Otherwise it won't be able to add vertex attribs, and it will be given a vertexless shader
+ * program in emitCode.
+ */
+class GrGeometryProcessor : public GrEffect {
+public:
+    GrGeometryProcessor() { fRequiresVertexShader = true; }
+
+protected:
+    /**
+     * Subclasses call this from their constructor to register vertex attributes (at most
+     * kMaxVertexAttribs). This must only be called from the constructor because GrEffects are
+     * immutable.
+     *
+     * We return a reference to the added var so that derived classes can name it nicely and use it
+     * in shader code.
+     */
+    const GrShaderVar& addVertexAttrib(const GrShaderVar& var) {
+        SkASSERT(GrShaderVar::kAttribute_TypeModifier == var.getTypeModifier());
+        SkASSERT(fVertexAttribs.count() < kMaxVertexAttribs);
+        return fVertexAttribs.push_back(var);
+    }
+
+private:
+    typedef GrEffect INHERITED;
+};
+
+#endif