Line data Source code
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 : #include "GrMatrixConvolutionEffect.h"
8 :
9 : #include "GrTextureProxy.h"
10 : #include "glsl/GrGLSLFragmentProcessor.h"
11 : #include "glsl/GrGLSLFragmentShaderBuilder.h"
12 : #include "glsl/GrGLSLProgramDataManager.h"
13 : #include "glsl/GrGLSLUniformHandler.h"
14 : #include "../private/GrGLSL.h"
15 :
16 0 : class GrGLMatrixConvolutionEffect : public GrGLSLFragmentProcessor {
17 : public:
18 : void emitCode(EmitArgs&) override;
19 :
20 : static inline void GenKey(const GrProcessor&, const GrShaderCaps&, GrProcessorKeyBuilder*);
21 :
22 : protected:
23 : void onSetData(const GrGLSLProgramDataManager&, const GrFragmentProcessor&) override;
24 :
25 : private:
26 : typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;
27 :
28 : UniformHandle fKernelUni;
29 : UniformHandle fImageIncrementUni;
30 : UniformHandle fKernelOffsetUni;
31 : UniformHandle fGainUni;
32 : UniformHandle fBiasUni;
33 : GrTextureDomain::GLDomain fDomain;
34 :
35 : typedef GrGLSLFragmentProcessor INHERITED;
36 : };
37 :
38 0 : void GrGLMatrixConvolutionEffect::emitCode(EmitArgs& args) {
39 0 : const GrMatrixConvolutionEffect& mce = args.fFp.cast<GrMatrixConvolutionEffect>();
40 0 : const GrTextureDomain& domain = mce.domain();
41 :
42 0 : int kWidth = mce.kernelSize().width();
43 0 : int kHeight = mce.kernelSize().height();
44 :
45 0 : int arrayCount = (kWidth * kHeight + 3) / 4;
46 0 : SkASSERT(4 * arrayCount >= kWidth * kHeight);
47 :
48 0 : GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
49 : fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
50 : kVec2f_GrSLType, kDefault_GrSLPrecision,
51 0 : "ImageIncrement");
52 : fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
53 : kVec4f_GrSLType, kDefault_GrSLPrecision,
54 : "Kernel",
55 0 : arrayCount);
56 : fKernelOffsetUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
57 : kVec2f_GrSLType, kDefault_GrSLPrecision,
58 0 : "KernelOffset");
59 : fGainUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
60 0 : kFloat_GrSLType, kDefault_GrSLPrecision, "Gain");
61 : fBiasUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
62 0 : kFloat_GrSLType, kDefault_GrSLPrecision, "Bias");
63 :
64 0 : const char* kernelOffset = uniformHandler->getUniformCStr(fKernelOffsetUni);
65 0 : const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
66 0 : const char* kernel = uniformHandler->getUniformCStr(fKernelUni);
67 0 : const char* gain = uniformHandler->getUniformCStr(fGainUni);
68 0 : const char* bias = uniformHandler->getUniformCStr(fBiasUni);
69 :
70 0 : GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
71 0 : SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
72 0 : fragBuilder->codeAppend("vec4 sum = vec4(0, 0, 0, 0);");
73 0 : fragBuilder->codeAppendf("vec2 coord = %s - %s * %s;", coords2D.c_str(), kernelOffset, imgInc);
74 0 : fragBuilder->codeAppend("vec4 c;");
75 :
76 0 : const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
77 0 : for (int y = 0; y < kHeight; y++) {
78 0 : for (int x = 0; x < kWidth; x++) {
79 0 : GrGLSLShaderBuilder::ShaderBlock block(fragBuilder);
80 0 : int offset = y*kWidth + x;
81 :
82 0 : fragBuilder->codeAppendf("float k = %s[%d]%s;", kernel, offset / 4,
83 0 : kVecSuffix[offset & 0x3]);
84 0 : SkString coord;
85 0 : coord.printf("coord + vec2(%d, %d) * %s", x, y, imgInc);
86 0 : fDomain.sampleTexture(fragBuilder,
87 : uniformHandler,
88 : args.fShaderCaps,
89 : domain,
90 : "c",
91 : coord,
92 0 : args.fTexSamplers[0]);
93 0 : if (!mce.convolveAlpha()) {
94 0 : fragBuilder->codeAppend("c.rgb /= c.a;");
95 0 : fragBuilder->codeAppend("c.rgb = clamp(c.rgb, 0.0, 1.0);");
96 : }
97 0 : fragBuilder->codeAppend("sum += c * k;");
98 : }
99 : }
100 0 : if (mce.convolveAlpha()) {
101 0 : fragBuilder->codeAppendf("%s = sum * %s + %s;", args.fOutputColor, gain, bias);
102 0 : fragBuilder->codeAppendf("%s.a = clamp(%s.a, 0, 1);", args.fOutputColor, args.fOutputColor);
103 0 : fragBuilder->codeAppendf("%s.rgb = clamp(%s.rgb, 0.0, %s.a);",
104 0 : args.fOutputColor, args.fOutputColor, args.fOutputColor);
105 : } else {
106 0 : fDomain.sampleTexture(fragBuilder,
107 : uniformHandler,
108 : args.fShaderCaps,
109 : domain,
110 : "c",
111 : coords2D,
112 0 : args.fTexSamplers[0]);
113 0 : fragBuilder->codeAppendf("%s.a = c.a;", args.fOutputColor);
114 0 : fragBuilder->codeAppendf("%s.rgb = clamp(sum.rgb * %s + %s, 0, 1);", args.fOutputColor, gain, bias);
115 0 : fragBuilder->codeAppendf("%s.rgb *= %s.a;", args.fOutputColor, args.fOutputColor);
116 : }
117 :
118 0 : SkString modulate;
119 0 : GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
120 0 : fragBuilder->codeAppend(modulate.c_str());
121 0 : }
122 :
123 0 : void GrGLMatrixConvolutionEffect::GenKey(const GrProcessor& processor,
124 : const GrShaderCaps&, GrProcessorKeyBuilder* b) {
125 0 : const GrMatrixConvolutionEffect& m = processor.cast<GrMatrixConvolutionEffect>();
126 0 : SkASSERT(m.kernelSize().width() <= 0x7FFF && m.kernelSize().height() <= 0xFFFF);
127 0 : uint32_t key = m.kernelSize().width() << 16 | m.kernelSize().height();
128 0 : key |= m.convolveAlpha() ? 1U << 31 : 0;
129 0 : b->add32(key);
130 0 : b->add32(GrTextureDomain::GLDomain::DomainKey(m.domain()));
131 0 : }
132 :
133 0 : void GrGLMatrixConvolutionEffect::onSetData(const GrGLSLProgramDataManager& pdman,
134 : const GrFragmentProcessor& processor) {
135 0 : const GrMatrixConvolutionEffect& conv = processor.cast<GrMatrixConvolutionEffect>();
136 0 : GrTexture* texture = conv.textureSampler(0).texture();
137 :
138 : float imageIncrement[2];
139 0 : float ySign = texture->origin() == kTopLeft_GrSurfaceOrigin ? 1.0f : -1.0f;
140 0 : imageIncrement[0] = 1.0f / texture->width();
141 0 : imageIncrement[1] = ySign / texture->height();
142 0 : pdman.set2fv(fImageIncrementUni, 1, imageIncrement);
143 0 : pdman.set2fv(fKernelOffsetUni, 1, conv.kernelOffset());
144 0 : int kernelCount = conv.kernelSize().width() * conv.kernelSize().height();
145 0 : int arrayCount = (kernelCount + 3) / 4;
146 0 : SkASSERT(4 * arrayCount >= kernelCount);
147 0 : pdman.set4fv(fKernelUni, arrayCount, conv.kernel());
148 0 : pdman.set1f(fGainUni, conv.gain());
149 0 : pdman.set1f(fBiasUni, conv.bias());
150 0 : fDomain.setData(pdman, conv.domain(), texture);
151 0 : }
152 :
153 0 : GrMatrixConvolutionEffect::GrMatrixConvolutionEffect(GrResourceProvider* resourceProvider,
154 : sk_sp<GrTextureProxy> proxy,
155 : const SkIRect& bounds,
156 : const SkISize& kernelSize,
157 : const SkScalar* kernel,
158 : SkScalar gain,
159 : SkScalar bias,
160 : const SkIPoint& kernelOffset,
161 : GrTextureDomain::Mode tileMode,
162 0 : bool convolveAlpha)
163 : // To advertise either the modulation or opaqueness optimizations we'd have to examine the
164 : // parameters.
165 : : INHERITED(resourceProvider, kNone_OptimizationFlags, proxy, nullptr, SkMatrix::I())
166 : , fKernelSize(kernelSize)
167 : , fGain(SkScalarToFloat(gain))
168 0 : , fBias(SkScalarToFloat(bias) / 255.0f)
169 : , fConvolveAlpha(convolveAlpha)
170 0 : , fDomain(proxy.get(), GrTextureDomain::MakeTexelDomainForMode(bounds, tileMode), tileMode) {
171 0 : this->initClassID<GrMatrixConvolutionEffect>();
172 0 : for (int i = 0; i < kernelSize.width() * kernelSize.height(); i++) {
173 0 : fKernel[i] = SkScalarToFloat(kernel[i]);
174 : }
175 0 : fKernelOffset[0] = static_cast<float>(kernelOffset.x());
176 0 : fKernelOffset[1] = static_cast<float>(kernelOffset.y());
177 0 : }
178 :
179 0 : void GrMatrixConvolutionEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
180 : GrProcessorKeyBuilder* b) const {
181 0 : GrGLMatrixConvolutionEffect::GenKey(*this, caps, b);
182 0 : }
183 :
184 0 : GrGLSLFragmentProcessor* GrMatrixConvolutionEffect::onCreateGLSLInstance() const {
185 0 : return new GrGLMatrixConvolutionEffect;
186 : }
187 :
188 0 : bool GrMatrixConvolutionEffect::onIsEqual(const GrFragmentProcessor& sBase) const {
189 0 : const GrMatrixConvolutionEffect& s = sBase.cast<GrMatrixConvolutionEffect>();
190 0 : return fKernelSize == s.kernelSize() &&
191 0 : !memcmp(fKernel, s.kernel(),
192 0 : fKernelSize.width() * fKernelSize.height() * sizeof(float)) &&
193 0 : fGain == s.gain() &&
194 0 : fBias == s.bias() &&
195 0 : fKernelOffset == s.kernelOffset() &&
196 0 : fConvolveAlpha == s.convolveAlpha() &&
197 0 : fDomain == s.domain();
198 : }
199 :
200 0 : static void fill_in_2D_gaussian_kernel(float* kernel, int width, int height,
201 : SkScalar sigmaX, SkScalar sigmaY) {
202 0 : SkASSERT(width * height <= MAX_KERNEL_SIZE);
203 0 : const float sigmaXDenom = 1.0f / (2.0f * SkScalarToFloat(SkScalarSquare(sigmaX)));
204 0 : const float sigmaYDenom = 1.0f / (2.0f * SkScalarToFloat(SkScalarSquare(sigmaY)));
205 0 : const int xRadius = width / 2;
206 0 : const int yRadius = height / 2;
207 :
208 0 : float sum = 0.0f;
209 0 : for (int x = 0; x < width; x++) {
210 0 : float xTerm = static_cast<float>(x - xRadius);
211 0 : xTerm = xTerm * xTerm * sigmaXDenom;
212 0 : for (int y = 0; y < height; y++) {
213 0 : float yTerm = static_cast<float>(y - yRadius);
214 0 : float xyTerm = sk_float_exp(-(xTerm + yTerm * yTerm * sigmaYDenom));
215 : // Note that the constant term (1/(sqrt(2*pi*sigma^2)) of the Gaussian
216 : // is dropped here, since we renormalize the kernel below.
217 0 : kernel[y * width + x] = xyTerm;
218 0 : sum += xyTerm;
219 : }
220 : }
221 : // Normalize the kernel
222 0 : float scale = 1.0f / sum;
223 0 : for (int i = 0; i < width * height; ++i) {
224 0 : kernel[i] *= scale;
225 : }
226 0 : }
227 :
228 :
229 : // Static function to create a 2D convolution
230 0 : sk_sp<GrFragmentProcessor> GrMatrixConvolutionEffect::MakeGaussian(
231 : GrResourceProvider* resourceProvider,
232 : sk_sp<GrTextureProxy> proxy,
233 : const SkIRect& bounds,
234 : const SkISize& kernelSize,
235 : SkScalar gain,
236 : SkScalar bias,
237 : const SkIPoint& kernelOffset,
238 : GrTextureDomain::Mode tileMode,
239 : bool convolveAlpha,
240 : SkScalar sigmaX,
241 : SkScalar sigmaY) {
242 : float kernel[MAX_KERNEL_SIZE];
243 :
244 0 : fill_in_2D_gaussian_kernel(kernel, kernelSize.width(), kernelSize.height(), sigmaX, sigmaY);
245 :
246 : return sk_sp<GrFragmentProcessor>(
247 0 : new GrMatrixConvolutionEffect(resourceProvider, std::move(proxy), bounds, kernelSize,
248 0 : kernel, gain, bias, kernelOffset, tileMode, convolveAlpha));
249 : }
250 :
251 : GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMatrixConvolutionEffect);
252 :
253 : #if GR_TEST_UTILS
254 0 : sk_sp<GrFragmentProcessor> GrMatrixConvolutionEffect::TestCreate(GrProcessorTestData* d) {
255 0 : int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx
256 0 : : GrProcessorUnitTest::kAlphaTextureIdx;
257 0 : sk_sp<GrTextureProxy> proxy = d->textureProxy(texIdx);
258 :
259 0 : int width = d->fRandom->nextRangeU(1, MAX_KERNEL_SIZE);
260 0 : int height = d->fRandom->nextRangeU(1, MAX_KERNEL_SIZE / width);
261 0 : SkISize kernelSize = SkISize::Make(width, height);
262 0 : std::unique_ptr<SkScalar[]> kernel(new SkScalar[width * height]);
263 0 : for (int i = 0; i < width * height; i++) {
264 0 : kernel.get()[i] = d->fRandom->nextSScalar1();
265 : }
266 0 : SkScalar gain = d->fRandom->nextSScalar1();
267 0 : SkScalar bias = d->fRandom->nextSScalar1();
268 0 : SkIPoint kernelOffset = SkIPoint::Make(d->fRandom->nextRangeU(0, kernelSize.width()),
269 0 : d->fRandom->nextRangeU(0, kernelSize.height()));
270 0 : SkIRect bounds = SkIRect::MakeXYWH(d->fRandom->nextRangeU(0, proxy->width()),
271 0 : d->fRandom->nextRangeU(0, proxy->height()),
272 0 : d->fRandom->nextRangeU(0, proxy->width()),
273 0 : d->fRandom->nextRangeU(0, proxy->height()));
274 : GrTextureDomain::Mode tileMode =
275 0 : static_cast<GrTextureDomain::Mode>(d->fRandom->nextRangeU(0, 2));
276 0 : bool convolveAlpha = d->fRandom->nextBool();
277 : return GrMatrixConvolutionEffect::Make(d->resourceProvider(),
278 0 : std::move(proxy),
279 : bounds,
280 : kernelSize,
281 0 : kernel.get(),
282 : gain,
283 : bias,
284 : kernelOffset,
285 : tileMode,
286 0 : convolveAlpha);
287 : }
288 : #endif
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