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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "effects/GrDisableColorXP.h"
#include "GrProcessor.h"
#include "gl/GrGLXferProcessor.h"
#include "gl/builders/GrGLFragmentShaderBuilder.h"
#include "gl/builders/GrGLProgramBuilder.h"
/**
* This xfer processor disables color writing. Thus color and coverage and ignored and no blending
* occurs. This XP is usful for things like stenciling.
*/
class DisableColorXP : public GrXferProcessor {
public:
static GrXferProcessor* Create() {
return SkNEW(DisableColorXP);
}
~DisableColorXP() SK_OVERRIDE {};
const char* name() const SK_OVERRIDE { return "Disable Color"; }
GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
bool hasSecondaryOutput() const SK_OVERRIDE { return false; }
GrXferProcessor::OptFlags getOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool doesStencilWrite,
GrColor* color,
const GrDrawTargetCaps& caps) SK_OVERRIDE {
return GrXferProcessor::kIgnoreColor_OptFlag | GrXferProcessor::kIgnoreCoverage_OptFlag;
}
void getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const SK_OVERRIDE;
private:
DisableColorXP();
void onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const SK_OVERRIDE;
bool onIsEqual(const GrXferProcessor& xpBase) const SK_OVERRIDE {
return true;
}
typedef GrXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
class GLDisableColorXP : public GrGLXferProcessor {
public:
GLDisableColorXP(const GrProcessor&) {}
~GLDisableColorXP() SK_OVERRIDE {}
static void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder*) {}
private:
void onEmitCode(const EmitArgs& args) SK_OVERRIDE {
// This emit code should be empty. However, on the nexus 6 there is a driver bug where if
// you do not give gl_FragColor a value, the gl context is lost and we end up drawing
// nothing. So this fix just sets the gl_FragColor arbitrarily to 0.
GrGLFPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
fsBuilder->codeAppendf("%s = vec4(0);", args.fOutputPrimary);
}
void onSetData(const GrGLProgramDataManager&, const GrXferProcessor&) SK_OVERRIDE {}
typedef GrGLXferProcessor INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
DisableColorXP::DisableColorXP() {
this->initClassID<DisableColorXP>();
}
void DisableColorXP::onGetGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const {
GLDisableColorXP::GenKey(*this, caps, b);
}
GrGLXferProcessor* DisableColorXP::createGLInstance() const {
return SkNEW_ARGS(GLDisableColorXP, (*this));
}
void DisableColorXP::getBlendInfo(GrXferProcessor::BlendInfo* blendInfo) const {
blendInfo->fWriteColor = false;
}
///////////////////////////////////////////////////////////////////////////////
GrDisableColorXPFactory::GrDisableColorXPFactory() {
this->initClassID<GrDisableColorXPFactory>();
}
GrXferProcessor*
GrDisableColorXPFactory::onCreateXferProcessor(const GrDrawTargetCaps& caps,
const GrProcOptInfo& colorPOI,
const GrProcOptInfo& covPOI,
const GrDeviceCoordTexture* dstCopy) const {
return DisableColorXP::Create();
}
GR_DEFINE_XP_FACTORY_TEST(GrDisableColorXPFactory);
GrXPFactory* GrDisableColorXPFactory::TestCreate(SkRandom* random,
GrContext*,
const GrDrawTargetCaps&,
GrTexture*[]) {
return GrDisableColorXPFactory::Create();
}
|
