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
|
/*
* 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 "GrGLSLGeometryProcessor.h"
#include "GrCoordTransform.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "glsl/GrGLSLVarying.h"
#include "glsl/GrGLSLVertexGeoBuilder.h"
void GrGLSLGeometryProcessor::emitCode(EmitArgs& args) {
GrGPArgs gpArgs;
this->onEmitCode(args, &gpArgs);
GrGLSLVertexBuilder* vBuilder = args.fVertBuilder;
if (!args.fGP.willUseGeoShader()) {
// Emit the vertex position to the hardware in the normalized window coordinates it expects.
SkASSERT(kFloat2_GrSLType == gpArgs.fPositionVar.getType() ||
kFloat3_GrSLType == gpArgs.fPositionVar.getType());
vBuilder->emitNormalizedSkPosition(gpArgs.fPositionVar.c_str(), args.fRTAdjustName,
gpArgs.fPositionVar.getType());
if (kFloat2_GrSLType == gpArgs.fPositionVar.getType()) {
args.fVaryingHandler->setNoPerspective();
}
} else {
// Since we have a geometry shader, leave the vertex position in Skia device space for now.
// The geometry Shader will operate in device space, and then convert the final positions to
// normalized hardware window coordinates under the hood, once everything else has finished.
// The subclass must call setNoPerspective on the varying handler, if applicable.
vBuilder->codeAppendf("sk_Position = float4(%s", gpArgs.fPositionVar.c_str());
switch (gpArgs.fPositionVar.getType()) {
case kFloat_GrSLType:
vBuilder->codeAppend(", 0"); // fallthru.
case kFloat2_GrSLType:
vBuilder->codeAppend(", 0"); // fallthru.
case kFloat3_GrSLType:
vBuilder->codeAppend(", 1"); // fallthru.
case kFloat4_GrSLType:
vBuilder->codeAppend(");");
break;
default:
SK_ABORT("Invalid position var type");
break;
}
}
}
void GrGLSLGeometryProcessor::emitTransforms(GrGLSLVertexBuilder* vb,
GrGLSLVaryingHandler* varyingHandler,
GrGLSLUniformHandler* uniformHandler,
const GrShaderVar& localCoordsVar,
const SkMatrix& localMatrix,
FPCoordTransformHandler* handler) {
SkASSERT(GrSLTypeIsFloatType(localCoordsVar.getType()));
SkASSERT(2 == GrSLTypeVecLength(localCoordsVar.getType()) ||
3 == GrSLTypeVecLength(localCoordsVar.getType()));
bool threeComponentLocalCoords = 3 == GrSLTypeVecLength(localCoordsVar.getType());
SkString localCoords;
if (threeComponentLocalCoords) {
localCoords = localCoordsVar.getName();
} else {
localCoords.printf("float3(%s, 1)", localCoordsVar.c_str());
}
int i = 0;
while (const GrCoordTransform* coordTransform = handler->nextCoordTransform()) {
SkString strUniName;
strUniName.printf("CoordTransformMatrix_%d", i);
const char* uniName;
fInstalledTransforms.push_back().fHandle = uniformHandler->addUniform(kVertex_GrShaderFlag,
kFloat3x3_GrSLType,
strUniName.c_str(),
&uniName).toIndex();
GrSLType varyingType = kFloat2_GrSLType;
if (localMatrix.hasPerspective() || coordTransform->getMatrix().hasPerspective()) {
varyingType = kFloat3_GrSLType;
}
SkString strVaryingName;
strVaryingName.printf("TransformedCoords_%d", i);
GrGLSLVarying v(varyingType);
varyingHandler->addVarying(strVaryingName.c_str(), &v);
handler->specifyCoordsForCurrCoordTransform(SkString(v.fsIn()), varyingType);
if (kFloat2_GrSLType == varyingType) {
vb->codeAppendf("%s = (%s * %s).xy;", v.vsOut(), uniName, localCoords.c_str());
if (threeComponentLocalCoords) {
vb->codeAppendf("%s /= %s.z;", v.vsOut(), localCoords.c_str());
}
} else {
vb->codeAppendf("%s = %s * %s;", v.vsOut(), uniName, localCoords.c_str());
}
++i;
}
}
void GrGLSLGeometryProcessor::setTransformDataHelper(const SkMatrix& localMatrix,
const GrGLSLProgramDataManager& pdman,
FPCoordTransformIter* transformIter) {
int i = 0;
while (const GrCoordTransform* coordTransform = transformIter->next()) {
const SkMatrix& m = GetTransformMatrix(localMatrix, *coordTransform);
if (!fInstalledTransforms[i].fCurrentValue.cheapEqualTo(m)) {
pdman.setSkMatrix(fInstalledTransforms[i].fHandle.toIndex(), m);
fInstalledTransforms[i].fCurrentValue = m;
}
++i;
}
SkASSERT(i == fInstalledTransforms.count());
}
void GrGLSLGeometryProcessor::writeOutputPosition(GrGLSLVertexBuilder* vertBuilder,
GrGPArgs* gpArgs,
const char* posName) {
gpArgs->fPositionVar.set(kFloat2_GrSLType, "pos2");
vertBuilder->codeAppendf("float2 %s = %s;", gpArgs->fPositionVar.c_str(), posName);
}
void GrGLSLGeometryProcessor::writeOutputPosition(GrGLSLVertexBuilder* vertBuilder,
GrGLSLUniformHandler* uniformHandler,
GrGPArgs* gpArgs,
const char* posName,
const SkMatrix& mat,
UniformHandle* viewMatrixUniform) {
if (mat.isIdentity()) {
gpArgs->fPositionVar.set(kFloat2_GrSLType, "pos2");
vertBuilder->codeAppendf("float2 %s = %s;", gpArgs->fPositionVar.c_str(), posName);
} else {
const char* viewMatrixName;
*viewMatrixUniform = uniformHandler->addUniform(kVertex_GrShaderFlag,
kFloat3x3_GrSLType,
"uViewM",
&viewMatrixName);
if (!mat.hasPerspective()) {
gpArgs->fPositionVar.set(kFloat2_GrSLType, "pos2");
vertBuilder->codeAppendf("float2 %s = (%s * float3(%s, 1)).xy;",
gpArgs->fPositionVar.c_str(), viewMatrixName, posName);
} else {
gpArgs->fPositionVar.set(kFloat3_GrSLType, "pos3");
vertBuilder->codeAppendf("float3 %s = %s * float3(%s, 1);",
gpArgs->fPositionVar.c_str(), viewMatrixName, posName);
}
}
}
|
