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1 /* | 1 /* |
2 * Copyright 2014 Google Inc. | 2 * Copyright 2014 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "GrBicubicEffect.h" | 8 #include "GrBicubicEffect.h" |
9 #include "GrInvariantOutput.h" | 9 #include "GrInvariantOutput.h" |
10 #include "glsl/GrGLSLFragmentShaderBuilder.h" | 10 #include "glsl/GrGLSLFragmentShaderBuilder.h" |
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65 SkString cubicBlendName; | 65 SkString cubicBlendName; |
66 | 66 |
67 static const GrGLSLShaderVar gCubicBlendArgs[] = { | 67 static const GrGLSLShaderVar gCubicBlendArgs[] = { |
68 GrGLSLShaderVar("coefficients", kMat44f_GrSLType), | 68 GrGLSLShaderVar("coefficients", kMat44f_GrSLType), |
69 GrGLSLShaderVar("t", kFloat_GrSLType), | 69 GrGLSLShaderVar("t", kFloat_GrSLType), |
70 GrGLSLShaderVar("c0", kVec4f_GrSLType), | 70 GrGLSLShaderVar("c0", kVec4f_GrSLType), |
71 GrGLSLShaderVar("c1", kVec4f_GrSLType), | 71 GrGLSLShaderVar("c1", kVec4f_GrSLType), |
72 GrGLSLShaderVar("c2", kVec4f_GrSLType), | 72 GrGLSLShaderVar("c2", kVec4f_GrSLType), |
73 GrGLSLShaderVar("c3", kVec4f_GrSLType), | 73 GrGLSLShaderVar("c3", kVec4f_GrSLType), |
74 }; | 74 }; |
75 GrGLSLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder()
; | 75 GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder; |
76 SkString coords2D = fsBuilder->ensureFSCoords2D(args.fCoords, 0); | 76 SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0); |
77 fsBuilder->emitFunction(kVec4f_GrSLType, | 77 fragBuilder->emitFunction(kVec4f_GrSLType, |
78 "cubicBlend", | 78 "cubicBlend", |
79 SK_ARRAY_COUNT(gCubicBlendArgs), | 79 SK_ARRAY_COUNT(gCubicBlendArgs), |
80 gCubicBlendArgs, | 80 gCubicBlendArgs, |
81 "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" | 81 "\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n" |
82 "\tvec4 c = coefficients * ts;\n" | 82 "\tvec4 c = coefficients * ts;\n" |
83 "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;
\n", | 83 "\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c
3;\n", |
84 &cubicBlendName); | 84 &cubicBlendName); |
85 fsBuilder->codeAppendf("\tvec2 coord = %s - %s * vec2(0.5);\n", coords2D.c_s
tr(), imgInc); | 85 fragBuilder->codeAppendf("\tvec2 coord = %s - %s * vec2(0.5);\n", coords2D.c
_str(), imgInc); |
86 // We unnormalize the coord in order to determine our fractional offset (f)
within the texel | 86 // We unnormalize the coord in order to determine our fractional offset (f)
within the texel |
87 // We then snap coord to a texel center and renormalize. The snap prevents c
ases where the | 87 // We then snap coord to a texel center and renormalize. The snap prevents c
ases where the |
88 // starting coords are near a texel boundary and accumulations of imgInc wou
ld cause us to skip/ | 88 // starting coords are near a texel boundary and accumulations of imgInc wou
ld cause us to skip/ |
89 // double hit a texel. | 89 // double hit a texel. |
90 fsBuilder->codeAppendf("\tcoord /= %s;\n", imgInc); | 90 fragBuilder->codeAppendf("\tcoord /= %s;\n", imgInc); |
91 fsBuilder->codeAppend("\tvec2 f = fract(coord);\n"); | 91 fragBuilder->codeAppend("\tvec2 f = fract(coord);\n"); |
92 fsBuilder->codeAppendf("\tcoord = (coord - f + vec2(0.5)) * %s;\n", imgInc); | 92 fragBuilder->codeAppendf("\tcoord = (coord - f + vec2(0.5)) * %s;\n", imgInc
); |
93 fsBuilder->codeAppend("\tvec4 rowColors[4];\n"); | 93 fragBuilder->codeAppend("\tvec4 rowColors[4];\n"); |
94 for (int y = 0; y < 4; ++y) { | 94 for (int y = 0; y < 4; ++y) { |
95 for (int x = 0; x < 4; ++x) { | 95 for (int x = 0; x < 4; ++x) { |
96 SkString coord; | 96 SkString coord; |
97 coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); | 97 coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1); |
98 SkString sampleVar; | 98 SkString sampleVar; |
99 sampleVar.printf("rowColors[%d]", x); | 99 sampleVar.printf("rowColors[%d]", x); |
100 fDomain.sampleTexture(fsBuilder, domain, sampleVar.c_str(), coord, a
rgs.fSamplers[0]); | 100 fDomain.sampleTexture(fragBuilder, domain, sampleVar.c_str(), coord,
args.fSamplers[0]); |
101 } | 101 } |
102 fsBuilder->codeAppendf("\tvec4 s%d = %s(%s, f.x, rowColors[0], rowColors
[1], rowColors[2], rowColors[3]);\n", y, cubicBlendName.c_str(), coeff); | 102 fragBuilder->codeAppendf( |
| 103 "\tvec4 s%d = %s(%s, f.x, rowColors[0], rowColors[1], rowColors[2],
rowColors[3]);\n", |
| 104 y, cubicBlendName.c_str(), coeff); |
103 } | 105 } |
104 SkString bicubicColor; | 106 SkString bicubicColor; |
105 bicubicColor.printf("%s(%s, f.y, s0, s1, s2, s3)", cubicBlendName.c_str(), c
oeff); | 107 bicubicColor.printf("%s(%s, f.y, s0, s1, s2, s3)", cubicBlendName.c_str(), c
oeff); |
106 fsBuilder->codeAppendf("\t%s = %s;\n", args.fOutputColor,(GrGLSLExpr4(bicubi
cColor.c_str()) * | 108 fragBuilder->codeAppendf("\t%s = %s;\n", |
107 GrGLSLExpr4(args.fInputColor)).c_str()); | 109 args.fOutputColor, (GrGLSLExpr4(bicubicColor.c_str(
)) * |
| 110 GrGLSLExpr4(args.fInputColor)).
c_str()); |
108 } | 111 } |
109 | 112 |
110 void GrGLBicubicEffect::onSetData(const GrGLSLProgramDataManager& pdman, | 113 void GrGLBicubicEffect::onSetData(const GrGLSLProgramDataManager& pdman, |
111 const GrProcessor& processor) { | 114 const GrProcessor& processor) { |
112 const GrBicubicEffect& bicubicEffect = processor.cast<GrBicubicEffect>(); | 115 const GrBicubicEffect& bicubicEffect = processor.cast<GrBicubicEffect>(); |
113 const GrTexture& texture = *processor.texture(0); | 116 const GrTexture& texture = *processor.texture(0); |
114 float imageIncrement[2]; | 117 float imageIncrement[2]; |
115 imageIncrement[0] = 1.0f / texture.width(); | 118 imageIncrement[0] = 1.0f / texture.width(); |
116 imageIncrement[1] = 1.0f / texture.height(); | 119 imageIncrement[1] = 1.0f / texture.height(); |
117 pdman.set2fv(fImageIncrementUni, 1, imageIncrement); | 120 pdman.set2fv(fImageIncrementUni, 1, imageIncrement); |
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209 // Use bilerp to handle rotation or fractional translation. | 212 // Use bilerp to handle rotation or fractional translation. |
210 *filterMode = GrTextureParams::kBilerp_FilterMode; | 213 *filterMode = GrTextureParams::kBilerp_FilterMode; |
211 } | 214 } |
212 return false; | 215 return false; |
213 } | 216 } |
214 // When we use the bicubic filtering effect each sample is read from the tex
ture using | 217 // When we use the bicubic filtering effect each sample is read from the tex
ture using |
215 // nearest neighbor sampling. | 218 // nearest neighbor sampling. |
216 *filterMode = GrTextureParams::kNone_FilterMode; | 219 *filterMode = GrTextureParams::kNone_FilterMode; |
217 return true; | 220 return true; |
218 } | 221 } |
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