jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 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 "GrDistanceFieldTextureEffect.h" |
| 9 | #include "gl/GrGLEffect.h" |
bsalomon | 848faf0 | 2014-07-11 10:01:02 -0700 | [diff] [blame] | 10 | #include "gl/GrGLShaderBuilder.h" |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 11 | #include "gl/GrGLSL.h" |
| 12 | #include "gl/GrGLTexture.h" |
| 13 | #include "gl/GrGLVertexEffect.h" |
| 14 | #include "GrTBackendEffectFactory.h" |
| 15 | #include "GrTexture.h" |
| 16 | |
commit-bot@chromium.org | 762cd80 | 2014-04-14 22:05:07 +0000 | [diff] [blame] | 17 | #include "SkDistanceFieldGen.h" |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 18 | |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 19 | // To get optical sizes people don't complain about when we blit correctly, |
| 20 | // we need to slightly bold each glyph. On the Mac, we need a larger bold value. |
| 21 | #if defined(SK_BUILD_FOR_MAC) |
| 22 | #define SK_DistanceFieldLCDFactor "0.33" |
| 23 | #define SK_DistanceFieldNonLCDFactor "0.25" |
| 24 | #else |
| 25 | #define SK_DistanceFieldLCDFactor "0.05" |
| 26 | #define SK_DistanceFieldNonLCDFactor "0.05" |
| 27 | #endif |
| 28 | |
| 29 | // Assuming a radius of the diagonal of the fragment, hence a factor of sqrt(2)/2 |
| 30 | #define SK_DistanceFieldAAFactor "0.7071" |
| 31 | |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 32 | class GrGLDistanceFieldTextureEffect : public GrGLVertexEffect { |
| 33 | public: |
skia.committer@gmail.com | a3b5327 | 2014-02-15 03:02:15 +0000 | [diff] [blame] | 34 | GrGLDistanceFieldTextureEffect(const GrBackendEffectFactory& factory, |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 35 | const GrDrawEffect& drawEffect) |
| 36 | : INHERITED (factory) |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 37 | , fTextureSize(SkISize::Make(-1,-1)) {} |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 38 | |
| 39 | virtual void emitCode(GrGLFullShaderBuilder* builder, |
| 40 | const GrDrawEffect& drawEffect, |
| 41 | EffectKey key, |
| 42 | const char* outputColor, |
| 43 | const char* inputColor, |
| 44 | const TransformedCoordsArray&, |
| 45 | const TextureSamplerArray& samplers) SK_OVERRIDE { |
| 46 | SkASSERT(1 == drawEffect.castEffect<GrDistanceFieldTextureEffect>().numVertexAttribs()); |
| 47 | |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 48 | SkAssertResult(builder->enableFeature(GrGLShaderBuilder::kStandardDerivatives_GLSLFeature)); |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 49 | const GrDistanceFieldTextureEffect& dfTexEffect = |
| 50 | drawEffect.castEffect<GrDistanceFieldTextureEffect>(); |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 51 | |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 52 | SkString fsCoordName; |
| 53 | const char* vsCoordName; |
| 54 | const char* fsCoordNamePtr; |
| 55 | builder->addVarying(kVec2f_GrSLType, "textureCoords", &vsCoordName, &fsCoordNamePtr); |
| 56 | fsCoordName = fsCoordNamePtr; |
| 57 | |
| 58 | const char* attrName0 = |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 59 | builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0])->c_str(); |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 60 | builder->vsCodeAppendf("\t%s = %s;\n", vsCoordName, attrName0); |
| 61 | |
| 62 | const char* textureSizeUniName = NULL; |
| 63 | fTextureSizeUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 64 | kVec2f_GrSLType, "TextureSize", |
| 65 | &textureSizeUniName); |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 66 | |
| 67 | builder->fsCodeAppend("\tvec4 texColor = "); |
| 68 | builder->fsAppendTextureLookup(samplers[0], |
| 69 | fsCoordName.c_str(), |
| 70 | kVec2f_GrSLType); |
| 71 | builder->fsCodeAppend(";\n"); |
skia.committer@gmail.com | a1ed7ae | 2014-04-15 03:04:18 +0000 | [diff] [blame] | 72 | builder->fsCodeAppend("\tfloat distance = " |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 73 | SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ")" |
| 74 | "+ " SK_DistanceFieldNonLCDFactor ";\n"); |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 75 | |
| 76 | // we adjust for the effect of the transformation on the distance by using |
| 77 | // the length of the gradient of the texture coordinates. We use st coordinates |
| 78 | // to ensure we're mapping 1:1 from texel space to pixel space. |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 79 | builder->fsCodeAppendf("\tvec2 uv = %s;\n", fsCoordName.c_str()); |
| 80 | builder->fsCodeAppendf("\tvec2 st = uv*%s;\n", textureSizeUniName); |
| 81 | builder->fsCodeAppend("\tfloat afwidth;\n"); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 82 | if (dfTexEffect.isSimilarity()) { |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 83 | // this gives us a smooth step across approximately one fragment |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 84 | builder->fsCodeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*dFdx(st.x);\n"); |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 85 | } else { |
| 86 | builder->fsCodeAppend("\tvec2 Jdx = dFdx(st);\n"); |
| 87 | builder->fsCodeAppend("\tvec2 Jdy = dFdy(st);\n"); |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 88 | |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 89 | builder->fsCodeAppend("\tvec2 uv_grad;\n"); |
| 90 | if (builder->ctxInfo().caps()->dropsTileOnZeroDivide()) { |
| 91 | // this is to compensate for the Adreno, which likes to drop tiles on division by 0 |
| 92 | builder->fsCodeAppend("\tfloat uv_len2 = dot(uv, uv);\n"); |
| 93 | builder->fsCodeAppend("\tif (uv_len2 < 0.0001) {\n"); |
| 94 | builder->fsCodeAppend("\t\tuv_grad = vec2(0.7071, 0.7071);\n"); |
| 95 | builder->fsCodeAppend("\t} else {\n"); |
| 96 | builder->fsCodeAppend("\t\tuv_grad = uv*inversesqrt(uv_len2);\n"); |
| 97 | builder->fsCodeAppend("\t}\n"); |
| 98 | } else { |
| 99 | builder->fsCodeAppend("\tuv_grad = normalize(uv);\n"); |
| 100 | } |
| 101 | builder->fsCodeAppend("\tvec2 grad = vec2(uv_grad.x*Jdx.x + uv_grad.y*Jdy.x,\n"); |
| 102 | builder->fsCodeAppend("\t uv_grad.x*Jdx.y + uv_grad.y*Jdy.y);\n"); |
| 103 | |
| 104 | // this gives us a smooth step across approximately one fragment |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 105 | builder->fsCodeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*length(grad);\n"); |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 106 | } |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 107 | builder->fsCodeAppend("\tfloat val = smoothstep(-afwidth, afwidth, distance);\n"); |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 108 | |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 109 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 110 | // adjust based on gamma |
| 111 | const char* luminanceUniName = NULL; |
| 112 | // width, height, 1/(3*width) |
| 113 | fLuminanceUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 114 | kFloat_GrSLType, "Luminance", |
| 115 | &luminanceUniName); |
| 116 | |
| 117 | builder->fsCodeAppendf("\tuv = vec2(val, %s);\n", luminanceUniName); |
| 118 | builder->fsCodeAppend("\tvec4 gammaColor = "); |
| 119 | builder->fsAppendTextureLookup(samplers[1], "uv", kVec2f_GrSLType); |
| 120 | builder->fsCodeAppend(";\n"); |
| 121 | builder->fsCodeAppend("\tval = gammaColor.r;\n"); |
| 122 | #endif |
| 123 | |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 124 | builder->fsCodeAppendf("\t%s = %s;\n", outputColor, |
| 125 | (GrGLSLExpr4(inputColor) * GrGLSLExpr1("val")).c_str()); |
| 126 | } |
| 127 | |
| 128 | virtual void setData(const GrGLUniformManager& uman, |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 129 | const GrDrawEffect& drawEffect) SK_OVERRIDE { |
| 130 | SkASSERT(fTextureSizeUni.isValid()); |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 131 | |
bsalomon | f99f884 | 2014-07-07 11:54:23 -0700 | [diff] [blame] | 132 | GrTexture* texture = drawEffect.effect()->texture(0); |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 133 | if (texture->width() != fTextureSize.width() || |
| 134 | texture->height() != fTextureSize.height()) { |
| 135 | fTextureSize = SkISize::Make(texture->width(), texture->height()); |
commit-bot@chromium.org | 66beaf0 | 2014-03-26 18:21:55 +0000 | [diff] [blame] | 136 | uman.set2f(fTextureSizeUni, |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 137 | SkIntToScalar(fTextureSize.width()), |
| 138 | SkIntToScalar(fTextureSize.height())); |
commit-bot@chromium.org | 66beaf0 | 2014-03-26 18:21:55 +0000 | [diff] [blame] | 139 | } |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 140 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 141 | const GrDistanceFieldTextureEffect& dfTexEffect = |
| 142 | drawEffect.castEffect<GrDistanceFieldTextureEffect>(); |
| 143 | float luminance = dfTexEffect.getLuminance(); |
| 144 | if (luminance != fLuminance) { |
| 145 | uman.set1f(fLuminanceUni, luminance); |
| 146 | fLuminance = luminance; |
| 147 | } |
| 148 | #endif |
commit-bot@chromium.org | 8fe2ee1 | 2014-03-26 18:03:05 +0000 | [diff] [blame] | 149 | } |
| 150 | |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 151 | static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { |
| 152 | const GrDistanceFieldTextureEffect& dfTexEffect = |
| 153 | drawEffect.castEffect<GrDistanceFieldTextureEffect>(); |
| 154 | |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 155 | return dfTexEffect.isSimilarity() ? 0x1 : 0x0; |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 156 | } |
| 157 | |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 158 | private: |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 159 | GrGLUniformManager::UniformHandle fTextureSizeUni; |
commit-bot@chromium.org | 4362a38 | 2014-03-26 19:49:03 +0000 | [diff] [blame] | 160 | SkISize fTextureSize; |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 161 | GrGLUniformManager::UniformHandle fLuminanceUni; |
| 162 | float fLuminance; |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 163 | |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 164 | typedef GrGLVertexEffect INHERITED; |
| 165 | }; |
| 166 | |
| 167 | /////////////////////////////////////////////////////////////////////////////// |
| 168 | |
| 169 | GrDistanceFieldTextureEffect::GrDistanceFieldTextureEffect(GrTexture* texture, |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 170 | const GrTextureParams& params, |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 171 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 172 | GrTexture* gamma, |
| 173 | const GrTextureParams& gammaParams, |
| 174 | float luminance, |
| 175 | #endif |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 176 | bool similarity) |
commit-bot@chromium.org | 6c89c34 | 2014-02-14 21:48:29 +0000 | [diff] [blame] | 177 | : fTextureAccess(texture, params) |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 178 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 179 | , fGammaTextureAccess(gamma, gammaParams) |
| 180 | , fLuminance(luminance) |
| 181 | #endif |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 182 | , fIsSimilarity(similarity) { |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 183 | this->addTextureAccess(&fTextureAccess); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 184 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 185 | this->addTextureAccess(&fGammaTextureAccess); |
| 186 | #endif |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 187 | this->addVertexAttrib(kVec2f_GrSLType); |
| 188 | } |
| 189 | |
| 190 | bool GrDistanceFieldTextureEffect::onIsEqual(const GrEffect& other) const { |
| 191 | const GrDistanceFieldTextureEffect& cte = CastEffect<GrDistanceFieldTextureEffect>(other); |
| 192 | return fTextureAccess == cte.fTextureAccess; |
| 193 | } |
| 194 | |
| 195 | void GrDistanceFieldTextureEffect::getConstantColorComponents(GrColor* color, |
| 196 | uint32_t* validFlags) const { |
| 197 | if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) && |
| 198 | GrPixelConfigIsOpaque(this->texture(0)->config())) { |
| 199 | *validFlags = kA_GrColorComponentFlag; |
| 200 | } else { |
| 201 | *validFlags = 0; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | const GrBackendEffectFactory& GrDistanceFieldTextureEffect::getFactory() const { |
| 206 | return GrTBackendEffectFactory<GrDistanceFieldTextureEffect>::getInstance(); |
| 207 | } |
| 208 | |
| 209 | /////////////////////////////////////////////////////////////////////////////// |
| 210 | |
| 211 | GR_DEFINE_EFFECT_TEST(GrDistanceFieldTextureEffect); |
| 212 | |
bsalomon | 83d081a | 2014-07-08 09:56:10 -0700 | [diff] [blame] | 213 | GrEffect* GrDistanceFieldTextureEffect::TestCreate(SkRandom* random, |
| 214 | GrContext*, |
| 215 | const GrDrawTargetCaps&, |
| 216 | GrTexture* textures[]) { |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 217 | int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : |
| 218 | GrEffectUnitTest::kAlphaTextureIdx; |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 219 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 220 | int texIdx2 = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : |
| 221 | GrEffectUnitTest::kAlphaTextureIdx; |
| 222 | #endif |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 223 | static const SkShader::TileMode kTileModes[] = { |
| 224 | SkShader::kClamp_TileMode, |
| 225 | SkShader::kRepeat_TileMode, |
| 226 | SkShader::kMirror_TileMode, |
| 227 | }; |
| 228 | SkShader::TileMode tileModes[] = { |
| 229 | kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| 230 | kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| 231 | }; |
| 232 | GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| 233 | GrTextureParams::kNone_FilterMode); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 234 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 235 | GrTextureParams params2(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| 236 | GrTextureParams::kNone_FilterMode); |
| 237 | #endif |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 238 | |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 239 | return GrDistanceFieldTextureEffect::Create(textures[texIdx], params, |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 240 | #ifdef SK_GAMMA_APPLY_TO_A8 |
| 241 | textures[texIdx2], params2, |
| 242 | random->nextF(), |
| 243 | #endif |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 244 | random->nextBool()); |
| 245 | } |
| 246 | |
| 247 | /////////////////////////////////////////////////////////////////////////////// |
| 248 | |
| 249 | class GrGLDistanceFieldLCDTextureEffect : public GrGLVertexEffect { |
| 250 | public: |
| 251 | GrGLDistanceFieldLCDTextureEffect(const GrBackendEffectFactory& factory, |
| 252 | const GrDrawEffect& drawEffect) |
| 253 | : INHERITED (factory) |
| 254 | , fTextureSize(SkISize::Make(-1,-1)) {} |
| 255 | |
| 256 | virtual void emitCode(GrGLFullShaderBuilder* builder, |
| 257 | const GrDrawEffect& drawEffect, |
| 258 | EffectKey key, |
| 259 | const char* outputColor, |
| 260 | const char* inputColor, |
| 261 | const TransformedCoordsArray&, |
| 262 | const TextureSamplerArray& samplers) SK_OVERRIDE { |
| 263 | SkASSERT(1 == drawEffect.castEffect<GrDistanceFieldLCDTextureEffect>().numVertexAttribs()); |
| 264 | |
| 265 | SkAssertResult(builder->enableFeature(GrGLShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| 266 | const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| 267 | drawEffect.castEffect<GrDistanceFieldLCDTextureEffect>(); |
| 268 | |
| 269 | SkString fsCoordName; |
| 270 | const char* vsCoordName; |
| 271 | const char* fsCoordNamePtr; |
| 272 | builder->addVarying(kVec2f_GrSLType, "textureCoords", &vsCoordName, &fsCoordNamePtr); |
| 273 | fsCoordName = fsCoordNamePtr; |
| 274 | |
| 275 | const char* attrName0 = |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 276 | builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0])->c_str(); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 277 | builder->vsCodeAppendf("\t%s = %s;\n", vsCoordName, attrName0); |
| 278 | |
| 279 | const char* textureSizeUniName = NULL; |
| 280 | // width, height, 1/(3*width) |
| 281 | fTextureSizeUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 282 | kVec3f_GrSLType, "TextureSize", |
| 283 | &textureSizeUniName); |
| 284 | |
| 285 | // create LCD offset adjusted by inverse of transform |
| 286 | builder->fsCodeAppendf("\tvec2 uv = %s;\n", fsCoordName.c_str()); |
| 287 | builder->fsCodeAppendf("\tvec2 st = uv*%s.xy;\n", textureSizeUniName); |
| 288 | if (dfTexEffect.isUniformScale()) { |
| 289 | builder->fsCodeAppend("\tfloat dx = dFdx(st.x);\n"); |
| 290 | builder->fsCodeAppendf("\tvec2 offset = vec2(dx*%s.z, 0.0);\n", textureSizeUniName); |
| 291 | } else { |
| 292 | builder->fsCodeAppend("\tvec2 Jdx = dFdx(st);\n"); |
| 293 | builder->fsCodeAppend("\tvec2 Jdy = dFdy(st);\n"); |
| 294 | builder->fsCodeAppendf("\tvec2 offset = %s.z*Jdx;\n", textureSizeUniName); |
| 295 | } |
| 296 | |
| 297 | // green is distance to uv center |
| 298 | builder->fsCodeAppend("\tvec4 texColor = "); |
| 299 | builder->fsAppendTextureLookup(samplers[0], "uv", kVec2f_GrSLType); |
| 300 | builder->fsCodeAppend(";\n"); |
| 301 | builder->fsCodeAppend("\tvec3 distance;\n"); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 302 | builder->fsCodeAppend("\tdistance.y = texColor.r;\n"); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 303 | // red is distance to left offset |
| 304 | builder->fsCodeAppend("\tvec2 uv_adjusted = uv - offset;\n"); |
| 305 | builder->fsCodeAppend("\ttexColor = "); |
| 306 | builder->fsAppendTextureLookup(samplers[0], "uv_adjusted", kVec2f_GrSLType); |
| 307 | builder->fsCodeAppend(";\n"); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 308 | builder->fsCodeAppend("\tdistance.x = texColor.r;\n"); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 309 | // blue is distance to right offset |
| 310 | builder->fsCodeAppend("\tuv_adjusted = uv + offset;\n"); |
| 311 | builder->fsCodeAppend("\ttexColor = "); |
| 312 | builder->fsAppendTextureLookup(samplers[0], "uv_adjusted", kVec2f_GrSLType); |
| 313 | builder->fsCodeAppend(";\n"); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 314 | builder->fsCodeAppend("\tdistance.z = texColor.r;\n"); |
| 315 | |
| 316 | builder->fsCodeAppend("\tdistance = " |
| 317 | "vec3(" SK_DistanceFieldMultiplier ")*(distance - vec3(" SK_DistanceFieldThreshold"))" |
| 318 | "+ vec3(" SK_DistanceFieldLCDFactor ");\n"); |
| 319 | |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 320 | // we adjust for the effect of the transformation on the distance by using |
| 321 | // the length of the gradient of the texture coordinates. We use st coordinates |
| 322 | // to ensure we're mapping 1:1 from texel space to pixel space. |
| 323 | |
| 324 | // To be strictly correct, we should compute the anti-aliasing factor separately |
| 325 | // for each color component. However, this is only important when using perspective |
| 326 | // transformations, and even then using a single factor seems like a reasonable |
| 327 | // trade-off between quality and speed. |
| 328 | builder->fsCodeAppend("\tfloat afwidth;\n"); |
| 329 | if (dfTexEffect.isUniformScale()) { |
| 330 | // this gives us a smooth step across approximately one fragment |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 331 | builder->fsCodeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*dx;\n"); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 332 | } else { |
| 333 | builder->fsCodeAppend("\tvec2 uv_grad;\n"); |
| 334 | if (builder->ctxInfo().caps()->dropsTileOnZeroDivide()) { |
| 335 | // this is to compensate for the Adreno, which likes to drop tiles on division by 0 |
| 336 | builder->fsCodeAppend("\tfloat uv_len2 = dot(uv, uv);\n"); |
| 337 | builder->fsCodeAppend("\tif (uv_len2 < 0.0001) {\n"); |
| 338 | builder->fsCodeAppend("\t\tuv_grad = vec2(0.7071, 0.7071);\n"); |
| 339 | builder->fsCodeAppend("\t} else {\n"); |
| 340 | builder->fsCodeAppend("\t\tuv_grad = uv*inversesqrt(uv_len2);\n"); |
| 341 | builder->fsCodeAppend("\t}\n"); |
| 342 | } else { |
| 343 | builder->fsCodeAppend("\tuv_grad = normalize(uv);\n"); |
| 344 | } |
| 345 | builder->fsCodeAppend("\tvec2 grad = vec2(uv_grad.x*Jdx.x + uv_grad.y*Jdy.x,\n"); |
| 346 | builder->fsCodeAppend("\t uv_grad.x*Jdx.y + uv_grad.y*Jdy.y);\n"); |
| 347 | |
| 348 | // this gives us a smooth step across approximately one fragment |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 349 | builder->fsCodeAppend("\tafwidth = " SK_DistanceFieldAAFactor "*length(grad);\n"); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | builder->fsCodeAppend("\tvec4 val = vec4(smoothstep(vec3(-afwidth), vec3(afwidth), distance), 1.0);\n"); |
| 353 | |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 354 | // adjust based on gamma |
| 355 | const char* textColorUniName = NULL; |
| 356 | // width, height, 1/(3*width) |
| 357 | fTextColorUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, |
| 358 | kVec3f_GrSLType, "TextColor", |
| 359 | &textColorUniName); |
| 360 | |
| 361 | builder->fsCodeAppendf("\tuv = vec2(val.x, %s.x);\n", textColorUniName); |
| 362 | builder->fsCodeAppend("\tvec4 gammaColor = "); |
| 363 | builder->fsAppendTextureLookup(samplers[1], "uv", kVec2f_GrSLType); |
| 364 | builder->fsCodeAppend(";\n"); |
| 365 | builder->fsCodeAppend("\tval.x = gammaColor.r;\n"); |
| 366 | |
| 367 | builder->fsCodeAppendf("\tuv = vec2(val.y, %s.y);\n", textColorUniName); |
| 368 | builder->fsCodeAppend("\tgammaColor = "); |
| 369 | builder->fsAppendTextureLookup(samplers[1], "uv", kVec2f_GrSLType); |
| 370 | builder->fsCodeAppend(";\n"); |
| 371 | builder->fsCodeAppend("\tval.y = gammaColor.r;\n"); |
| 372 | |
| 373 | builder->fsCodeAppendf("\tuv = vec2(val.z, %s.z);\n", textColorUniName); |
| 374 | builder->fsCodeAppend("\tgammaColor = "); |
| 375 | builder->fsAppendTextureLookup(samplers[1], "uv", kVec2f_GrSLType); |
| 376 | builder->fsCodeAppend(";\n"); |
| 377 | builder->fsCodeAppend("\tval.z = gammaColor.r;\n"); |
| 378 | |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 379 | builder->fsCodeAppendf("\t%s = %s;\n", outputColor, |
| 380 | (GrGLSLExpr4(inputColor) * GrGLSLExpr4("val")).c_str()); |
| 381 | } |
| 382 | |
| 383 | virtual void setData(const GrGLUniformManager& uman, |
| 384 | const GrDrawEffect& drawEffect) SK_OVERRIDE { |
| 385 | SkASSERT(fTextureSizeUni.isValid()); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 386 | SkASSERT(fTextColorUni.isValid()); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 387 | |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 388 | const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| 389 | drawEffect.castEffect<GrDistanceFieldLCDTextureEffect>(); |
bsalomon | f99f884 | 2014-07-07 11:54:23 -0700 | [diff] [blame] | 390 | GrTexture* texture = drawEffect.effect()->texture(0); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 391 | if (texture->width() != fTextureSize.width() || |
| 392 | texture->height() != fTextureSize.height()) { |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 393 | fTextureSize = SkISize::Make(texture->width(), texture->height()); |
| 394 | float delta = 1.0f/(3.0f*texture->width()); |
| 395 | if (dfTexEffect.useBGR()) { |
| 396 | delta = -delta; |
| 397 | } |
| 398 | uman.set3f(fTextureSizeUni, |
| 399 | SkIntToScalar(fTextureSize.width()), |
| 400 | SkIntToScalar(fTextureSize.height()), |
| 401 | delta); |
| 402 | } |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 403 | |
| 404 | GrColor textColor = dfTexEffect.getTextColor(); |
| 405 | if (textColor != fTextColor) { |
| 406 | static const float ONE_OVER_255 = 1.f / 255.f; |
| 407 | uman.set3f(fTextColorUni, |
| 408 | GrColorUnpackR(textColor) * ONE_OVER_255, |
| 409 | GrColorUnpackG(textColor) * ONE_OVER_255, |
| 410 | GrColorUnpackB(textColor) * ONE_OVER_255); |
| 411 | fTextColor = textColor; |
| 412 | } |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { |
| 416 | const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| 417 | drawEffect.castEffect<GrDistanceFieldLCDTextureEffect>(); |
| 418 | |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 419 | return dfTexEffect.isUniformScale() ? 0x01 : 0x00;; |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | private: |
| 423 | GrGLUniformManager::UniformHandle fTextureSizeUni; |
| 424 | SkISize fTextureSize; |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 425 | GrGLUniformManager::UniformHandle fTextColorUni; |
| 426 | SkColor fTextColor; |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 427 | |
| 428 | typedef GrGLVertexEffect INHERITED; |
| 429 | }; |
| 430 | |
| 431 | /////////////////////////////////////////////////////////////////////////////// |
| 432 | |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 433 | GrDistanceFieldLCDTextureEffect::GrDistanceFieldLCDTextureEffect( |
| 434 | GrTexture* texture, const GrTextureParams& params, |
| 435 | GrTexture* gamma, const GrTextureParams& gParams, |
| 436 | SkColor textColor, |
| 437 | bool uniformScale, bool useBGR) |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 438 | : fTextureAccess(texture, params) |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 439 | , fGammaTextureAccess(gamma, gParams) |
| 440 | , fTextColor(textColor) |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 441 | , fUniformScale(uniformScale) |
| 442 | , fUseBGR(useBGR) { |
| 443 | this->addTextureAccess(&fTextureAccess); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 444 | this->addTextureAccess(&fGammaTextureAccess); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 445 | this->addVertexAttrib(kVec2f_GrSLType); |
| 446 | } |
| 447 | |
| 448 | bool GrDistanceFieldLCDTextureEffect::onIsEqual(const GrEffect& other) const { |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 449 | const GrDistanceFieldLCDTextureEffect& cte = |
| 450 | CastEffect<GrDistanceFieldLCDTextureEffect>(other); |
| 451 | return (fTextureAccess == cte.fTextureAccess && fGammaTextureAccess == cte.fGammaTextureAccess); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | void GrDistanceFieldLCDTextureEffect::getConstantColorComponents(GrColor* color, |
| 455 | uint32_t* validFlags) const { |
| 456 | if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) && |
| 457 | GrPixelConfigIsOpaque(this->texture(0)->config())) { |
| 458 | *validFlags = kA_GrColorComponentFlag; |
| 459 | } else { |
| 460 | *validFlags = 0; |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | const GrBackendEffectFactory& GrDistanceFieldLCDTextureEffect::getFactory() const { |
| 465 | return GrTBackendEffectFactory<GrDistanceFieldLCDTextureEffect>::getInstance(); |
| 466 | } |
| 467 | |
| 468 | /////////////////////////////////////////////////////////////////////////////// |
| 469 | |
| 470 | GR_DEFINE_EFFECT_TEST(GrDistanceFieldLCDTextureEffect); |
| 471 | |
bsalomon | 83d081a | 2014-07-08 09:56:10 -0700 | [diff] [blame] | 472 | GrEffect* GrDistanceFieldLCDTextureEffect::TestCreate(SkRandom* random, |
| 473 | GrContext*, |
| 474 | const GrDrawTargetCaps&, |
| 475 | GrTexture* textures[]) { |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 476 | int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 477 | GrEffectUnitTest::kAlphaTextureIdx; |
| 478 | int texIdx2 = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx : |
| 479 | GrEffectUnitTest::kAlphaTextureIdx; |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 480 | static const SkShader::TileMode kTileModes[] = { |
| 481 | SkShader::kClamp_TileMode, |
| 482 | SkShader::kRepeat_TileMode, |
| 483 | SkShader::kMirror_TileMode, |
| 484 | }; |
| 485 | SkShader::TileMode tileModes[] = { |
| 486 | kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| 487 | kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| 488 | }; |
| 489 | GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| 490 | GrTextureParams::kNone_FilterMode); |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 491 | GrTextureParams params2(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| 492 | GrTextureParams::kNone_FilterMode); |
| 493 | GrColor textColor = GrColorPackRGBA(random->nextULessThan(256), |
| 494 | random->nextULessThan(256), |
| 495 | random->nextULessThan(256), |
| 496 | random->nextULessThan(256)); |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 497 | return GrDistanceFieldLCDTextureEffect::Create(textures[texIdx], params, |
jvanverth | 2d2a68c | 2014-06-10 06:42:56 -0700 | [diff] [blame] | 498 | textures[texIdx2], params2, |
| 499 | textColor, |
commit-bot@chromium.org | 609ced4 | 2014-04-03 18:25:48 +0000 | [diff] [blame] | 500 | random->nextBool(), random->nextBool()); |
jvanverth@google.com | d830d13 | 2013-11-11 20:54:09 +0000 | [diff] [blame] | 501 | } |