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bsalomon@google.coma04e8e82012-08-27 12:53:13 +00001/*
2 * Copyright 2012 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 "GrConfigConversionEffect.h"
bsalomon@google.comb1456d72012-11-02 18:23:45 +00009#include "GrContext.h"
bsalomon@google.com2eaaefd2012-10-29 19:51:22 +000010#include "GrTBackendEffectFactory.h"
bsalomon@google.com68b58c92013-01-17 16:50:08 +000011#include "GrSimpleTextureEffect.h"
bsalomon@google.comd698f772012-10-25 13:22:00 +000012#include "gl/GrGLEffect.h"
bsalomon848faf02014-07-11 10:01:02 -070013#include "gl/GrGLShaderBuilder.h"
bsalomon@google.comb1456d72012-11-02 18:23:45 +000014#include "SkMatrix.h"
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000015
bsalomon@google.com22a800a2012-10-26 19:16:46 +000016class GrGLConfigConversionEffect : public GrGLEffect {
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000017public:
bsalomon@google.com396e61f2012-10-25 19:00:29 +000018 GrGLConfigConversionEffect(const GrBackendEffectFactory& factory,
bsalomon@google.comc7818882013-03-20 19:19:53 +000019 const GrDrawEffect& drawEffect)
bsalomon@google.com77af6802013-10-02 13:04:56 +000020 : INHERITED (factory) {
bsalomon@google.comc7818882013-03-20 19:19:53 +000021 const GrConfigConversionEffect& effect = drawEffect.castEffect<GrConfigConversionEffect>();
bsalomon@google.com021fc732012-10-25 12:47:42 +000022 fSwapRedAndBlue = effect.swapsRedAndBlue();
23 fPMConversion = effect.pmConversion();
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000024 }
25
bsalomon@google.com22a800a2012-10-26 19:16:46 +000026 virtual void emitCode(GrGLShaderBuilder* builder,
bsalomon@google.comc7818882013-03-20 19:19:53 +000027 const GrDrawEffect&,
bsalomon63e99f72014-07-21 08:03:14 -070028 const GrEffectKey& key,
bsalomon@google.com22a800a2012-10-26 19:16:46 +000029 const char* outputColor,
30 const char* inputColor,
bsalomon@google.com77af6802013-10-02 13:04:56 +000031 const TransformedCoordsArray& coords,
bsalomon@google.com22a800a2012-10-26 19:16:46 +000032 const TextureSamplerArray& samplers) SK_OVERRIDE {
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000033 builder->fsCodeAppendf("\t\t%s = ", outputColor);
bsalomon@google.com77af6802013-10-02 13:04:56 +000034 builder->fsAppendTextureLookup(samplers[0], coords[0].c_str(), coords[0].type());
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000035 builder->fsCodeAppend(";\n");
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000036 if (GrConfigConversionEffect::kNone_PMConversion == fPMConversion) {
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +000037 SkASSERT(fSwapRedAndBlue);
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000038 builder->fsCodeAppendf("\t%s = %s.bgra;\n", outputColor, outputColor);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000039 } else {
40 const char* swiz = fSwapRedAndBlue ? "bgr" : "rgb";
41 switch (fPMConversion) {
42 case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion:
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000043 builder->fsCodeAppendf(
bsalomon@google.com868a8e72012-08-30 19:11:34 +000044 "\t\t%s = vec4(ceil(%s.%s * %s.a * 255.0) / 255.0, %s.a);\n",
45 outputColor, outputColor, swiz, outputColor, outputColor);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000046 break;
47 case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion:
commit-bot@chromium.orgb4e200e2013-06-19 11:41:02 +000048 // Add a compensation(0.001) here to avoid the side effect of the floor operation.
49 // In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0
50 // is less than the integer value converted from %s.r by 1 when the %s.r is
51 // converted from the integer value 2^n, such as 1, 2, 4, 8, etc.
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000052 builder->fsCodeAppendf(
commit-bot@chromium.orgb4e200e2013-06-19 11:41:02 +000053 "\t\t%s = vec4(floor(%s.%s * %s.a * 255.0 + 0.001) / 255.0, %s.a);\n",
bsalomon@google.com868a8e72012-08-30 19:11:34 +000054 outputColor, outputColor, swiz, outputColor, outputColor);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000055 break;
56 case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion:
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000057 builder->fsCodeAppendf("\t\t%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(ceil(%s.%s / %s.a * 255.0) / 255.0, %s.a);\n",
bsalomon@google.com868a8e72012-08-30 19:11:34 +000058 outputColor, outputColor, outputColor, swiz, outputColor, outputColor);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000059 break;
60 case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion:
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000061 builder->fsCodeAppendf("\t\t%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(floor(%s.%s / %s.a * 255.0) / 255.0, %s.a);\n",
bsalomon@google.com868a8e72012-08-30 19:11:34 +000062 outputColor, outputColor, outputColor, swiz, outputColor, outputColor);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000063 break;
robertphillips@google.com2af1b182012-08-28 11:23:09 +000064 default:
commit-bot@chromium.org88cb22b2014-04-30 14:17:00 +000065 SkFAIL("Unknown conversion op.");
robertphillips@google.com2af1b182012-08-28 11:23:09 +000066 break;
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000067 }
68 }
bsalomon@google.comf910d3b2013-03-07 17:06:57 +000069 SkString modulate;
70 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
71 builder->fsCodeAppend(modulate.c_str());
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000072 }
73
bsalomon63e99f72014-07-21 08:03:14 -070074 static inline void GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&,
75 GrEffectKeyBuilder* b) {
bsalomon@google.comc7818882013-03-20 19:19:53 +000076 const GrConfigConversionEffect& conv = drawEffect.castEffect<GrConfigConversionEffect>();
bsalomon63e99f72014-07-21 08:03:14 -070077 uint32_t key = (conv.swapsRedAndBlue() ? 0 : 1) | (conv.pmConversion() << 1);
78 b->add32(key);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000079 }
80
81private:
82 bool fSwapRedAndBlue;
83 GrConfigConversionEffect::PMConversion fPMConversion;
84
bsalomon@google.com22a800a2012-10-26 19:16:46 +000085 typedef GrGLEffect INHERITED;
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000086
87};
88
89///////////////////////////////////////////////////////////////////////////////
90
91GrConfigConversionEffect::GrConfigConversionEffect(GrTexture* texture,
92 bool swapRedAndBlue,
bsalomon@google.comb1456d72012-11-02 18:23:45 +000093 PMConversion pmConversion,
94 const SkMatrix& matrix)
95 : GrSingleTextureEffect(texture, matrix)
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000096 , fSwapRedAndBlue(swapRedAndBlue)
97 , fPMConversion(pmConversion) {
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +000098 SkASSERT(kRGBA_8888_GrPixelConfig == texture->config() ||
bsalomon@google.coma04e8e82012-08-27 12:53:13 +000099 kBGRA_8888_GrPixelConfig == texture->config());
100 // Why did we pollute our texture cache instead of using a GrSingleTextureEffect?
tfarina@chromium.orgf6de4752013-08-17 00:02:59 +0000101 SkASSERT(swapRedAndBlue || kNone_PMConversion != pmConversion);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000102}
103
bsalomon@google.com396e61f2012-10-25 19:00:29 +0000104const GrBackendEffectFactory& GrConfigConversionEffect::getFactory() const {
105 return GrTBackendEffectFactory<GrConfigConversionEffect>::getInstance();
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000106}
107
bsalomon@google.com8a252f72013-01-22 20:35:13 +0000108bool GrConfigConversionEffect::onIsEqual(const GrEffect& s) const {
bsalomon@google.com6340a412013-01-22 19:55:59 +0000109 const GrConfigConversionEffect& other = CastEffect<GrConfigConversionEffect>(s);
bsalomon@google.com8a252f72013-01-22 20:35:13 +0000110 return this->texture(0) == s.texture(0) &&
bsalomon@google.com68b58c92013-01-17 16:50:08 +0000111 other.fSwapRedAndBlue == fSwapRedAndBlue &&
112 other.fPMConversion == fPMConversion;
113}
114
115void GrConfigConversionEffect::getConstantColorComponents(GrColor* color,
116 uint32_t* validFlags) const {
117 this->updateConstantColorComponentsForModulation(color, validFlags);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000118}
119
120///////////////////////////////////////////////////////////////////////////////
121
bsalomon@google.comf271cc72012-10-24 19:35:13 +0000122GR_DEFINE_EFFECT_TEST(GrConfigConversionEffect);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000123
bsalomon83d081a2014-07-08 09:56:10 -0700124GrEffect* GrConfigConversionEffect::TestCreate(SkRandom* random,
125 GrContext*,
126 const GrDrawTargetCaps&,
127 GrTexture* textures[]) {
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000128 PMConversion pmConv = static_cast<PMConversion>(random->nextULessThan(kPMConversionCnt));
129 bool swapRB;
130 if (kNone_PMConversion == pmConv) {
131 swapRB = true;
132 } else {
133 swapRB = random->nextBool();
134 }
bsalomon55fad7a2014-07-08 07:34:20 -0700135 return SkNEW_ARGS(GrConfigConversionEffect,
bsalomon@google.com6340a412013-01-22 19:55:59 +0000136 (textures[GrEffectUnitTest::kSkiaPMTextureIdx],
137 swapRB,
138 pmConv,
bsalomon55fad7a2014-07-08 07:34:20 -0700139 GrEffectUnitTest::TestMatrix(random)));
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000140}
141
142///////////////////////////////////////////////////////////////////////////////
143void GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context,
144 PMConversion* pmToUPMRule,
145 PMConversion* upmToPMRule) {
146 *pmToUPMRule = kNone_PMConversion;
147 *upmToPMRule = kNone_PMConversion;
148 SkAutoTMalloc<uint32_t> data(256 * 256 * 3);
149 uint32_t* srcData = data.get();
150 uint32_t* firstRead = data.get() + 256 * 256;
151 uint32_t* secondRead = data.get() + 2 * 256 * 256;
152
153 // Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate
154 // values in row y. We set r,g, and b to the same value since they are handled identically.
155 for (int y = 0; y < 256; ++y) {
156 for (int x = 0; x < 256; ++x) {
157 uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[256*y + x]);
158 color[3] = y;
commit-bot@chromium.org972f9cd2014-03-28 17:58:28 +0000159 color[2] = SkTMin(x, y);
160 color[1] = SkTMin(x, y);
161 color[0] = SkTMin(x, y);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000162 }
163 }
164
165 GrTextureDesc desc;
166 desc.fFlags = kRenderTarget_GrTextureFlagBit |
167 kNoStencil_GrTextureFlagBit;
168 desc.fWidth = 256;
169 desc.fHeight = 256;
170 desc.fConfig = kRGBA_8888_GrPixelConfig;
171
172 SkAutoTUnref<GrTexture> readTex(context->createUncachedTexture(desc, NULL, 0));
173 if (!readTex.get()) {
174 return;
175 }
176 SkAutoTUnref<GrTexture> tempTex(context->createUncachedTexture(desc, NULL, 0));
177 if (!tempTex.get()) {
178 return;
179 }
180 desc.fFlags = kNone_GrTextureFlags;
181 SkAutoTUnref<GrTexture> dataTex(context->createUncachedTexture(desc, data, 0));
182 if (!dataTex.get()) {
183 return;
184 }
185
186 static const PMConversion kConversionRules[][2] = {
187 {kDivByAlpha_RoundDown_PMConversion, kMulByAlpha_RoundUp_PMConversion},
188 {kDivByAlpha_RoundUp_PMConversion, kMulByAlpha_RoundDown_PMConversion},
189 };
190
191 GrContext::AutoWideOpenIdentityDraw awoid(context, NULL);
192
193 bool failed = true;
194
commit-bot@chromium.org972f9cd2014-03-28 17:58:28 +0000195 for (size_t i = 0; i < SK_ARRAY_COUNT(kConversionRules) && failed; ++i) {
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000196 *pmToUPMRule = kConversionRules[i][0];
197 *upmToPMRule = kConversionRules[i][1];
198
commit-bot@chromium.orgfd03d4a2013-07-17 21:39:42 +0000199 static const SkRect kDstRect = SkRect::MakeWH(SkIntToScalar(256), SkIntToScalar(256));
200 static const SkRect kSrcRect = SkRect::MakeWH(SK_Scalar1, SK_Scalar1);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000201 // We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
202 // from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
203 // We then verify that two reads produced the same values.
204
bsalomon55fad7a2014-07-08 07:34:20 -0700205 SkAutoTUnref<GrEffect> pmToUPM1(SkNEW_ARGS(GrConfigConversionEffect, (dataTex,
206 false,
207 *pmToUPMRule,
208 SkMatrix::I())));
209 SkAutoTUnref<GrEffect> upmToPM(SkNEW_ARGS(GrConfigConversionEffect, (readTex,
210 false,
211 *upmToPMRule,
212 SkMatrix::I())));
213 SkAutoTUnref<GrEffect> pmToUPM2(SkNEW_ARGS(GrConfigConversionEffect, (tempTex,
214 false,
215 *pmToUPMRule,
216 SkMatrix::I())));
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000217
218 context->setRenderTarget(readTex->asRenderTarget());
commit-bot@chromium.org42dacab2013-07-13 17:24:24 +0000219 GrPaint paint1;
bsalomon55fad7a2014-07-08 07:34:20 -0700220 paint1.addColorEffect(pmToUPM1);
commit-bot@chromium.org42dacab2013-07-13 17:24:24 +0000221 context->drawRectToRect(paint1, kDstRect, kSrcRect);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000222
223 readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
224
225 context->setRenderTarget(tempTex->asRenderTarget());
commit-bot@chromium.org42dacab2013-07-13 17:24:24 +0000226 GrPaint paint2;
bsalomon55fad7a2014-07-08 07:34:20 -0700227 paint2.addColorEffect(upmToPM);
commit-bot@chromium.org42dacab2013-07-13 17:24:24 +0000228 context->drawRectToRect(paint2, kDstRect, kSrcRect);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000229 context->setRenderTarget(readTex->asRenderTarget());
commit-bot@chromium.org42dacab2013-07-13 17:24:24 +0000230
231 GrPaint paint3;
bsalomon55fad7a2014-07-08 07:34:20 -0700232 paint3.addColorEffect(pmToUPM2);
commit-bot@chromium.org42dacab2013-07-13 17:24:24 +0000233 context->drawRectToRect(paint3, kDstRect, kSrcRect);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000234
235 readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead);
236
237 failed = false;
238 for (int y = 0; y < 256 && !failed; ++y) {
239 for (int x = 0; x <= y; ++x) {
240 if (firstRead[256 * y + x] != secondRead[256 * y + x]) {
241 failed = true;
242 break;
243 }
244 }
245 }
246 }
247 if (failed) {
248 *pmToUPMRule = kNone_PMConversion;
249 *upmToPMRule = kNone_PMConversion;
250 }
251}
252
bsalomon83d081a2014-07-08 09:56:10 -0700253const GrEffect* GrConfigConversionEffect::Create(GrTexture* texture,
254 bool swapRedAndBlue,
255 PMConversion pmConversion,
256 const SkMatrix& matrix) {
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000257 if (!swapRedAndBlue && kNone_PMConversion == pmConversion) {
bsalomon@google.comadc65362013-01-28 14:26:09 +0000258 // If we returned a GrConfigConversionEffect that was equivalent to a GrSimpleTextureEffect
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000259 // then we may pollute our texture cache with redundant shaders. So in the case that no
bsalomon@google.comadc65362013-01-28 14:26:09 +0000260 // conversions were requested we instead return a GrSimpleTextureEffect.
261 return GrSimpleTextureEffect::Create(texture, matrix);
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000262 } else {
263 if (kRGBA_8888_GrPixelConfig != texture->config() &&
264 kBGRA_8888_GrPixelConfig != texture->config() &&
265 kNone_PMConversion != pmConversion) {
266 // The PM conversions assume colors are 0..255
bsalomon@google.comadc65362013-01-28 14:26:09 +0000267 return NULL;
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000268 }
bsalomon55fad7a2014-07-08 07:34:20 -0700269 return SkNEW_ARGS(GrConfigConversionEffect, (texture,
270 swapRedAndBlue,
271 pmConversion,
272 matrix));
bsalomon@google.coma04e8e82012-08-27 12:53:13 +0000273 }
274}