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| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef GrGeometryProcessor_DEFINED |
| 9 #define GrGeometryProcessor_DEFINED |
| 10 |
| 11 #include "GrEffect.h" |
| 12 |
| 13 /** |
| 14 * If an effect needs specialized vertex shader code, then it must inherit from
this class. |
| 15 * Otherwise it won't be able to add vertex attribs, and it will be given a vert
exless shader |
| 16 * program in emitCode. |
| 17 */ |
| 18 class GrGeometryProcessor : public GrEffect { |
| 19 public: |
| 20 GrGeometryProcessor() { fRequiresVertexShader = true; } |
| 21 |
| 22 protected: |
| 23 /** |
| 24 * Subclasses call this from their constructor to register vertex attributes
(at most |
| 25 * kMaxVertexAttribs). This must only be called from the constructor because
GrEffects are |
| 26 * immutable. |
| 27 * |
| 28 * We return a reference to the added var so that derived classes can name i
t nicely and use it |
| 29 * in shader code. |
| 30 */ |
| 31 const GrShaderVar& addVertexAttrib(const GrShaderVar& var) { |
| 32 SkASSERT(GrShaderVar::kAttribute_TypeModifier == var.getTypeModifier()); |
| 33 SkASSERT(fVertexAttribs.count() < kMaxVertexAttribs); |
| 34 return fVertexAttribs.push_back(var); |
| 35 } |
| 36 |
| 37 private: |
| 38 typedef GrEffect INHERITED; |
| 39 }; |
| 40 |
| 41 #endif |
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