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 "glsl/GrGLSLFragmentShaderBuilder.h"
12#include "glsl/GrGLSLUniformHandler.h"
13#include "glsl/GrGLSLVertexShaderBuilder.h"
14
15SkMatrix GrGLSLPrimitiveProcessor::GetTransformMatrix(const SkMatrix& localMatrix,
16                                                      const GrCoordTransform& coordTransform) {
17    SkMatrix combined;
18    combined.setConcat(coordTransform.getMatrix(), localMatrix);
19    if (coordTransform.normalize()) {
20        SkASSERT(coordTransform.texture());
21        combined.postIDiv(coordTransform.texture()->width(), coordTransform.texture()->height());
22    }
23
24    if (coordTransform.reverseY()) {
25        // combined.postScale(1,-1);
26        // combined.postTranslate(0,1);
27        combined.set(SkMatrix::kMSkewY,
28            combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
29        combined.set(SkMatrix::kMScaleY,
30            combined[SkMatrix::kMPersp1] - combined[SkMatrix::kMScaleY]);
31        combined.set(SkMatrix::kMTransY,
32            combined[SkMatrix::kMPersp2] - combined[SkMatrix::kMTransY]);
33    }
34    return combined;
35}
36
37void GrGLSLPrimitiveProcessor::setupUniformColor(GrGLSLPPFragmentBuilder* fragBuilder,
38                                                 GrGLSLUniformHandler* uniformHandler,
39                                                 const char* outputName,
40                                                 UniformHandle* colorUniform) {
41    SkASSERT(colorUniform);
42    const char* stagedLocalVarName;
43    *colorUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
44                                               kVec4f_GrSLType,
45                                               kDefault_GrSLPrecision,
46                                               "Color",
47                                               &stagedLocalVarName);
48    fragBuilder->codeAppendf("%s = %s;", outputName, stagedLocalVarName);
49}
50
51//////////////////////////////////////////////////////////////////////////////
52
53const GrCoordTransform* GrGLSLPrimitiveProcessor::FPCoordTransformHandler::nextCoordTransform() {
54#ifdef SK_DEBUG
55    SkASSERT(nullptr == fCurr || fAddedCoord);
56    fAddedCoord = false;
57    fCurr = fIter.next();
58    return fCurr;
59#else
60    return fIter.next();
61#endif
62}
63