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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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