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 "src/gpu/glsl/GrGLSLPrimitiveProcessor.h"
9
10#include "src/gpu/GrCoordTransform.h"
11#include "src/gpu/GrTexture.h"
12#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
13#include "src/gpu/glsl/GrGLSLProgramBuilder.h"
14#include "src/gpu/glsl/GrGLSLUniformHandler.h"
15#include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h"
16
17SkMatrix GrGLSLPrimitiveProcessor::GetTransformMatrix(const GrCoordTransform& coordTransform,
18 const SkMatrix& preMatrix) {
19 SkMatrix combined;
20 combined.setConcat(coordTransform.matrix(), preMatrix);
21 if (coordTransform.normalize()) {
22 SkMatrixPriv::PostIDiv(&combined, 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
51void 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(nullptr,
58 kFragment_GrShaderFlag,
59 kHalf4_GrSLType,
60 "Color",
61 &stagedLocalVarName);
62 fragBuilder->codeAppendf("%s = %s;", outputName, stagedLocalVarName);
63 if (fragBuilder->getProgramBuilder()->shaderCaps()->mustObfuscateUniformColor()) {
64 fragBuilder->codeAppendf("%s = max(%s, half4(0, 0, 0, 0));", outputName, outputName);
65 }
66}
67
68//////////////////////////////////////////////////////////////////////////////
69
70GrGLSLPrimitiveProcessor::FPCoordTransformHandler::FPCoordTransformHandler(
71 const GrPipeline& pipeline, SkTArray<TransformVar>* transformedCoordVars)
72 : fIter(pipeline), fTransformedCoordVars(transformedCoordVars) {}
73
74std::pair<const GrCoordTransform&, const GrFragmentProcessor&>
75GrGLSLPrimitiveProcessor::FPCoordTransformHandler::get() const {
76 return *fIter;
77}
78
79GrGLSLPrimitiveProcessor::FPCoordTransformHandler&
80GrGLSLPrimitiveProcessor::FPCoordTransformHandler::operator++() {
81 SkASSERT(fAddedCoord);
82 ++fIter;
83 SkDEBUGCODE(fAddedCoord = false;)
84 return *this;
85}
86