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 
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 
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 
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