1 /*
2 * Copyright 2014 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 #include "GrGLSLPrimitiveProcessor.h"
9
10 #include "GrCoordTransform.h"
11 #include "GrTexture.h"
12 #include "glsl/GrGLSLFragmentShaderBuilder.h"
13 #include "glsl/GrGLSLProgramBuilder.h"
14 #include "glsl/GrGLSLUniformHandler.h"
15 #include "glsl/GrGLSLVertexGeoBuilder.h"
16
GetTransformMatrix(const SkMatrix & localMatrix,const GrCoordTransform & coordTransform)17 SkMatrix GrGLSLPrimitiveProcessor::GetTransformMatrix(const SkMatrix& localMatrix,
18 const GrCoordTransform& coordTransform) {
19 SkMatrix combined;
20 combined.setConcat(coordTransform.getMatrix(), localMatrix);
21 if (coordTransform.normalize()) {
22 combined.postIDiv(coordTransform.peekTexture()->width(),
23 coordTransform.peekTexture()->height());
24 }
25
26 if (coordTransform.reverseY()) {
27 if (coordTransform.normalize()) {
28 // combined.postScale(1,-1);
29 // combined.postTranslate(0,1);
30 combined.set(SkMatrix::kMSkewY,
31 combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
32 combined.set(SkMatrix::kMScaleY,
33 combined[SkMatrix::kMPersp1] - combined[SkMatrix::kMScaleY]);
34 combined.set(SkMatrix::kMTransY,
35 combined[SkMatrix::kMPersp2] - combined[SkMatrix::kMTransY]);
36 } else {
37 // combined.postScale(1, -1);
38 // combined.postTranslate(0,1);
39 SkScalar h = coordTransform.peekTexture()->height();
40 combined.set(SkMatrix::kMSkewY,
41 h * combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
42 combined.set(SkMatrix::kMScaleY,
43 h * combined[SkMatrix::kMPersp1] - combined[SkMatrix::kMScaleY]);
44 combined.set(SkMatrix::kMTransY,
45 h * combined[SkMatrix::kMPersp2] - combined[SkMatrix::kMTransY]);
46 }
47 }
48 return combined;
49 }
50
setupUniformColor(GrGLSLFPFragmentBuilder * fragBuilder,GrGLSLUniformHandler * uniformHandler,const char * outputName,UniformHandle * colorUniform)51 void GrGLSLPrimitiveProcessor::setupUniformColor(GrGLSLFPFragmentBuilder* fragBuilder,
52 GrGLSLUniformHandler* uniformHandler,
53 const char* outputName,
54 UniformHandle* colorUniform) {
55 SkASSERT(colorUniform);
56 const char* stagedLocalVarName;
57 *colorUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
58 kHalf4_GrSLType,
59 "Color",
60 &stagedLocalVarName);
61 fragBuilder->codeAppendf("%s = %s;", outputName, stagedLocalVarName);
62 if (fragBuilder->getProgramBuilder()->shaderCaps()->mustObfuscateUniformColor()) {
63 fragBuilder->codeAppendf("%s = max(%s, half4(0, 0, 0, 0));", outputName, outputName);
64 }
65 }
66
67 //////////////////////////////////////////////////////////////////////////////
68
nextCoordTransform()69 const GrCoordTransform* GrGLSLPrimitiveProcessor::FPCoordTransformHandler::nextCoordTransform() {
70 #ifdef SK_DEBUG
71 SkASSERT(nullptr == fCurr || fAddedCoord);
72 fAddedCoord = false;
73 fCurr = fIter.next();
74 return fCurr;
75 #else
76 return fIter.next();
77 #endif
78 }
79