1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrColorTableEffect.h"
#include "gl/GrGLProgramStage.h"
#include "GrProgramStageFactory.h"
#include "SkString.h"
///////////////////////////////////////////////////////////////////////////////
class GrGLColorTableEffect : public GrGLProgramStage {
public:
GrGLColorTableEffect(const GrProgramStageFactory& factory,
const GrCustomStage& stage);
virtual void setupVariables(GrGLShaderBuilder* state,
int stage) SK_OVERRIDE {}
virtual void emitVS(GrGLShaderBuilder* state,
const char* vertexCoords) SK_OVERRIDE {}
virtual void emitFS(GrGLShaderBuilder* state,
const char* outputColor,
const char* inputColor,
const char* samplerName) SK_OVERRIDE;
virtual void initUniforms(const GrGLShaderBuilder*,
const GrGLInterface*,
int programID) SK_OVERRIDE {}
virtual void setData(const GrGLInterface*,
const GrCustomStage&,
const GrRenderTarget*,
int stageNum) SK_OVERRIDE {}
static inline StageKey GenKey(const GrCustomStage&);
private:
typedef GrGLProgramStage INHERITED;
};
GrGLColorTableEffect::GrGLColorTableEffect(
const GrProgramStageFactory& factory, const GrCustomStage& stage)
: INHERITED(factory) {
}
void GrGLColorTableEffect::emitFS(GrGLShaderBuilder* state,
const char* outputColor,
const char* inputColor,
const char* samplerName) {
static const float kColorScaleFactor = 255.0f / 256.0f;
static const float kColorOffsetFactor = 1.0f / 512.0f;
SkString* code = &state->fFSCode;
code->appendf("\t\tvec4 coord = vec4(%s.rgb / %s.a, %s.a);\n",
inputColor, inputColor, inputColor);
code->appendf("\t\tcoord = coord * %f + vec4(%f, %f, %f, %f);\n",
kColorScaleFactor,
kColorOffsetFactor, kColorOffsetFactor, kColorOffsetFactor, kColorOffsetFactor);
code->appendf("\t\t%s.a = texture2D(%s, vec2(coord.a, 0.125)).a;\n",
outputColor, samplerName);
code->appendf("\t\t%s.r = texture2D(%s, vec2(coord.r, 0.375)).a;\n",
outputColor, samplerName);
code->appendf("\t\t%s.g = texture2D(%s, vec2(coord.g, 0.625)).a;\n",
outputColor, samplerName);
code->appendf("\t\t%s.b = texture2D(%s, vec2(coord.b, 0.875)).a;\n",
outputColor, samplerName);
code->appendf("\t\t%s.rgb *= %s.a;\n", outputColor, outputColor);
}
GrGLProgramStage::StageKey GrGLColorTableEffect::GenKey(
const GrCustomStage& s) {
return 0;
}
///////////////////////////////////////////////////////////////////////////////
GrColorTableEffect::GrColorTableEffect(GrTexture* texture)
: INHERITED(texture) {
}
GrColorTableEffect::~GrColorTableEffect() {
}
const GrProgramStageFactory& GrColorTableEffect::getFactory() const {
return GrTProgramStageFactory<GrColorTableEffect>::getInstance();
}
bool GrColorTableEffect::isEqual(const GrCustomStage& sBase) const {
return INHERITED::isEqual(sBase);
}
|
