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 "src/gpu/GrPrimitiveProcessor.h"
12
13/**
14 * A GrGeometryProcessor is a flexible method for rendering a primitive. The GrGeometryProcessor
15 * has complete control over vertex attributes and uniforms (aside from the render target) but it
16 * must obey the same contract as any GrPrimitiveProcessor, specifically it must emit a color and
17 * coverage into the fragment shader. Where this color and coverage come from is completely the
18 * responsibility of the GrGeometryProcessor.
19 *
20 * Note that all derived classes should hide their constructors and provide a Make factory
21 * function that takes an arena (except for CCPR-specific classes). This is because
22 * GrGeometryProcessor's are not ref-counted to must have some other mechanism for managing
23 * their lifetime. In particular, geometry processors can be created in either the
24 * record-time or flush-time arenas which defined their lifetimes (i.e., a DDLs life time in
25 * the first case and a single flush in the second case).
26 */
27class GrGeometryProcessor : public GrPrimitiveProcessor {
28public:
29 GrGeometryProcessor(ClassID classID) : INHERITED(classID) {}
30
31protected:
32 // GPs that need to use either float or ubyte colors can just call this to get a correctly
33 // configured Attribute struct
34 static Attribute MakeColorAttribute(const char* name, bool wideColor) {
35 return { name,
36 wideColor ? kFloat4_GrVertexAttribType : kUByte4_norm_GrVertexAttribType,
37 kHalf4_GrSLType };
38 }
39
40private:
41 typedef GrPrimitiveProcessor INHERITED;
42};
43
44#endif
45