blob: 73846b8df380371d1c74999fed985ea5e14f407d (
plain)
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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLProgramDesc.h"
#include "GrBackendEffectFactory.h"
#include "GrDrawEffect.h"
#include "GrEffect.h"
#include "GrGLShaderBuilder.h"
#include "GrGpuGL.h"
void GrGLProgramDesc::Build(const GrDrawState& drawState,
bool isPoints,
GrDrawState::BlendOptFlags blendOpts,
GrBlendCoeff srcCoeff,
GrBlendCoeff dstCoeff,
const GrGpuGL* gpu,
const GrDeviceCoordTexture* dstCopy,
GrGLProgramDesc* desc) {
// This should already have been caught
GrAssert(!(GrDrawState::kSkipDraw_BlendOptFlag & blendOpts));
bool skipCoverage = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool skipColor = SkToBool(blendOpts & (GrDrawState::kEmitTransBlack_BlendOptFlag |
GrDrawState::kEmitCoverage_BlendOptFlag));
// The descriptor is used as a cache key. Thus when a field of the
// descriptor will not affect program generation (because of the attribute
// bindings in use or other descriptor field settings) it should be set
// to a canonical value to avoid duplicate programs with different keys.
desc->fEmitsPointSize = isPoints;
bool requiresColorAttrib = !skipColor && drawState.hasColorVertexAttribute();
bool requiresCoverageAttrib = !skipCoverage && drawState.hasCoverageVertexAttribute();
// we only need the local coords if we're actually going to generate effect code
bool requiresLocalCoordAttrib = !(skipCoverage && skipColor) &&
drawState.hasLocalCoordAttribute();
// fColorInput/fCoverageInput records how colors are specified for the program so we strip the
// bits from the bindings to avoid false negatives when searching for an existing program in the
// cache.
desc->fColorFilterXfermode = skipColor ? SkXfermode::kDst_Mode : drawState.getColorFilterMode();
bool colorIsTransBlack = SkToBool(blendOpts & GrDrawState::kEmitTransBlack_BlendOptFlag);
bool colorIsSolidWhite = (blendOpts & GrDrawState::kEmitCoverage_BlendOptFlag) ||
(!requiresColorAttrib && 0xffffffff == drawState.getColor());
if (colorIsTransBlack) {
desc->fColorInput = kTransBlack_ColorInput;
} else if (colorIsSolidWhite) {
desc->fColorInput = kSolidWhite_ColorInput;
} else if (GR_GL_NO_CONSTANT_ATTRIBUTES && !requiresColorAttrib) {
desc->fColorInput = kUniform_ColorInput;
} else {
desc->fColorInput = kAttribute_ColorInput;
}
bool covIsSolidWhite = !requiresCoverageAttrib && 0xffffffff == drawState.getCoverage();
if (skipCoverage) {
desc->fCoverageInput = kTransBlack_ColorInput;
} else if (covIsSolidWhite) {
desc->fCoverageInput = kSolidWhite_ColorInput;
} else if (GR_GL_NO_CONSTANT_ATTRIBUTES && !requiresCoverageAttrib) {
desc->fCoverageInput = kUniform_ColorInput;
} else {
desc->fCoverageInput = kAttribute_ColorInput;
}
bool readsDst = false;
int lastEnabledStage = -1;
for (int s = 0; s < GrDrawState::kNumStages; ++s) {
bool skip = s < drawState.getFirstCoverageStage() ? skipColor : skipCoverage;
if (!skip && drawState.isStageEnabled(s)) {
lastEnabledStage = s;
const GrEffectRef& effect = *drawState.getStage(s).getEffect();
const GrBackendEffectFactory& factory = effect->getFactory();
GrDrawEffect drawEffect(drawState.getStage(s), requiresLocalCoordAttrib);
desc->fEffectKeys[s] = factory.glEffectKey(drawEffect, gpu->glCaps());
if (effect->willReadDst()) {
readsDst = true;
}
} else {
desc->fEffectKeys[s] = 0;
}
}
if (readsDst) {
GrAssert(NULL != dstCopy);
desc->fDstRead = GrGLShaderBuilder::KeyForDstRead(dstCopy->texture(), gpu->glCaps());
GrAssert(0 != desc->fDstRead);
} else {
desc->fDstRead = 0;
}
desc->fDualSrcOutput = kNone_DualSrcOutput;
// Currently the experimental GS will only work with triangle prims (and it doesn't do anything
// other than pass through values from the VS to the FS anyway).
#if GR_GL_EXPERIMENTAL_GS
#if 0
desc->fExperimentalGS = gpu->caps().geometryShaderSupport();
#else
desc->fExperimentalGS = false;
#endif
#endif
// We leave this set to kNumStages until we discover that the coverage/color distinction is
// material to the generated program. We do this to avoid distinct keys that generate equivalent
// programs.
desc->fFirstCoverageStage = GrDrawState::kNumStages;
// This tracks the actual first coverage stage.
int firstCoverageStage = GrDrawState::kNumStages;
desc->fDiscardIfZeroCoverage = false; // Enabled below if stenciling and there is coverage.
bool hasCoverage = false;
// If we're rendering coverage-as-color then it's as though there are no coverage stages.
if (!drawState.isCoverageDrawing()) {
// We can have coverage either through a stage or coverage vertex attributes.
if (drawState.getFirstCoverageStage() <= lastEnabledStage) {
firstCoverageStage = drawState.getFirstCoverageStage();
hasCoverage = true;
} else {
hasCoverage = requiresCoverageAttrib;
}
}
if (hasCoverage) {
// color filter is applied between color/coverage computation
if (SkXfermode::kDst_Mode != desc->fColorFilterXfermode) {
desc->fFirstCoverageStage = firstCoverageStage;
}
// If we're stenciling then we want to discard samples that have zero coverage
if (drawState.getStencil().doesWrite()) {
desc->fDiscardIfZeroCoverage = true;
desc->fFirstCoverageStage = firstCoverageStage;
}
if (gpu->caps()->dualSourceBlendingSupport() &&
!(blendOpts & (GrDrawState::kEmitCoverage_BlendOptFlag |
GrDrawState::kCoverageAsAlpha_BlendOptFlag))) {
if (kZero_GrBlendCoeff == dstCoeff) {
// write the coverage value to second color
desc->fDualSrcOutput = kCoverage_DualSrcOutput;
desc->fFirstCoverageStage = firstCoverageStage;
} else if (kSA_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
desc->fDualSrcOutput = kCoverageISA_DualSrcOutput;
desc->fFirstCoverageStage = firstCoverageStage;
} else if (kSC_GrBlendCoeff == dstCoeff) {
// SA dst coeff becomes 1-(1-SA)*coverage when dst is partially covered.
desc->fDualSrcOutput = kCoverageISC_DualSrcOutput;
desc->fFirstCoverageStage = firstCoverageStage;
}
}
}
desc->fPositionAttributeIndex = drawState.positionAttributeIndex();
desc->fLocalCoordAttributeIndex = drawState.localCoordAttributeIndex();
// For constant color and coverage we need an attribute with an index beyond those already set
int availableAttributeIndex = drawState.getVertexAttribCount();
if (requiresColorAttrib) {
desc->fColorAttributeIndex = drawState.colorVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == desc->fColorInput) {
GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
desc->fColorAttributeIndex = availableAttributeIndex;
availableAttributeIndex++;
} else {
desc->fColorAttributeIndex = -1;
}
if (requiresCoverageAttrib) {
desc->fCoverageAttributeIndex = drawState.coverageVertexAttributeIndex();
} else if (GrGLProgramDesc::kAttribute_ColorInput == desc->fCoverageInput) {
GrAssert(availableAttributeIndex < GrDrawState::kMaxVertexAttribCnt);
desc->fCoverageAttributeIndex = availableAttributeIndex;
} else {
desc->fCoverageAttributeIndex = -1;
}
}
|
