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 GrVertexEffect_DEFINED
9#define GrVertexEffect_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 might be given a vertexless shader
16 * program in emitCode.
17 */
18class GrVertexEffect : public GrEffect {
19public:
20    GrVertexEffect() { fHasVertexCode = true; }
21
22protected:
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    void addVertexAttrib(GrSLType type) {
29        SkASSERT(fVertexAttribTypes.count() < kMaxVertexAttribs);
30        fVertexAttribTypes.push_back(type);
31    }
32
33private:
34    typedef GrEffect INHERITED;
35};
36
37#endif
38