| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrDistanceFieldTextureEffect.h" |
| #include "GrFontAtlasSizes.h" |
| #include "GrInvariantOutput.h" |
| #include "GrTexture.h" |
| #include "SkDistanceFieldGen.h" |
| #include "gl/GrGLProcessor.h" |
| #include "gl/GrGLSL.h" |
| #include "gl/GrGLTexture.h" |
| #include "gl/GrGLGeometryProcessor.h" |
| #include "gl/builders/GrGLProgramBuilder.h" |
| |
| // Assuming a radius of the diagonal of the fragment, hence a factor of sqrt(2)/2 |
| #define SK_DistanceFieldAAFactor "0.65" |
| |
| struct DistanceFieldBatchTracker { |
| GrGPInput fInputColorType; |
| GrColor fColor; |
| bool fUsesLocalCoords; |
| }; |
| |
| class GrGLDistanceFieldTextureEffect : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldTextureEffect(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fColor(GrColor_ILLEGAL) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fLuminance(-1.0f) |
| #endif |
| {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) SK_OVERRIDE{ |
| const GrDistanceFieldTextureEffect& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldTextureEffect>(); |
| const DistanceFieldBatchTracker& local = args.fBT.cast<DistanceFieldBatchTracker>(); |
| GrGLGPBuilder* pb = args.fPB; |
| GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| |
| // emit attributes |
| vsBuilder->emitAttributes(dfTexEffect); |
| |
| GrGLVertToFrag st(kVec2f_GrSLType); |
| args.fPB->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision); |
| vsBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| GrGLVertToFrag uv(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision); |
| // this is only used with text, so our texture bounds always match the glyph atlas |
| vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_A8_RECIP_WIDTH ", " |
| GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", uv.vsOut(), |
| dfTexEffect.inTextureCoords()->fName); |
| |
| // Setup pass through color |
| this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, |
| dfTexEffect.inColor(), &fColorUniform); |
| |
| // Setup position |
| this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix()); |
| |
| // emit transforms |
| this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName, |
| dfTexEffect.localMatrix(), args.fTransformsIn, args.fTransformsOut); |
| |
| // Use highp to work around aliasing issues |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn()); |
| |
| fsBuilder->codeAppend("\tfloat texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], |
| "uv", |
| kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;\n"); |
| fsBuilder->codeAppend("\tfloat distance = " |
| SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");"); |
| |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 st = %s;", st.fsIn()); |
| fsBuilder->codeAppend("float afwidth;"); |
| if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) { |
| // For uniform scale, we adjust for the effect of the transformation on the distance |
| // by using the length of the gradient of the texture coordinates. We use st coordinates |
| // to ensure we're mapping 1:1 from texel space to pixel space. |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(st.x));"); |
| } else { |
| // For general transforms, to determine the amount of correction we multiply a unit |
| // vector pointing along the SDF gradient direction by the Jacobian of the st coords |
| // (which is the inverse transform for this fragment) and take the length of the result. |
| fsBuilder->codeAppend("vec2 dist_grad = vec2(dFdx(distance), dFdy(distance));"); |
| // the length of the gradient may be 0, so we need to check for this |
| // this also compensates for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fsBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fsBuilder->codeAppend("}"); |
| |
| fsBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fsBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| fsBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| fsBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);"); |
| |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| // adjust based on gamma |
| const char* luminanceUniName = NULL; |
| // width, height, 1/(3*width) |
| fLuminanceUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kFloat_GrSLType, kDefault_GrSLPrecision, |
| "Luminance", &luminanceUniName); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val, %s);\n", luminanceUniName); |
| fsBuilder->codeAppend("\tvec4 gammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tval = gammaColor.r;\n"); |
| #endif |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrPrimitiveProcessor& proc, |
| const GrBatchTracker& bt) SK_OVERRIDE { |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| const GrDistanceFieldTextureEffect& dfTexEffect = |
| proc.cast<GrDistanceFieldTextureEffect>(); |
| float luminance = dfTexEffect.getLuminance(); |
| if (luminance != fLuminance) { |
| pdman.set1f(fLuminanceUni, luminance); |
| fLuminance = luminance; |
| } |
| #endif |
| |
| this->setUniformViewMatrix(pdman, proc.viewMatrix()); |
| |
| const DistanceFieldBatchTracker& local = bt.cast<DistanceFieldBatchTracker>(); |
| if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) { |
| GrGLfloat c[4]; |
| GrColorToRGBAFloat(local.fColor, c); |
| pdman.set4fv(fColorUniform, 1, c); |
| fColor = local.fColor; |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrBatchTracker& bt, |
| const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldTextureEffect& dfTexEffect = gp.cast<GrDistanceFieldTextureEffect>(); |
| const DistanceFieldBatchTracker& local = bt.cast<DistanceFieldBatchTracker>(); |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= local.fInputColorType << 16; |
| key |= local.fUsesLocalCoords && gp.localMatrix().hasPerspective() ? 0x1 << 24: 0x0; |
| key |= ComputePosKey(gp.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| GrColor fColor; |
| UniformHandle fColorUniform; |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| UniformHandle fLuminanceUni; |
| float fLuminance; |
| #endif |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldTextureEffect::GrDistanceFieldTextureEffect(GrColor color, |
| const SkMatrix& viewMatrix, |
| GrTexture* texture, |
| const GrTextureParams& params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| GrTexture* gamma, |
| const GrTextureParams& gammaParams, |
| float luminance, |
| #endif |
| uint32_t flags, bool opaqueVertexColors) |
| : INHERITED(color, viewMatrix, SkMatrix::I(), opaqueVertexColors) |
| , fTextureAccess(texture, params) |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| , fGammaTextureAccess(gamma, gammaParams) |
| , fLuminance(luminance) |
| #endif |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| , fInColor(NULL) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldTextureEffect>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); |
| if (flags & kColorAttr_DistanceFieldEffectFlag) { |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| this->setHasVertexColor(); |
| } |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2s_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| this->addTextureAccess(&fGammaTextureAccess); |
| #endif |
| } |
| |
| bool GrDistanceFieldTextureEffect::onIsEqual(const GrGeometryProcessor& other) const { |
| const GrDistanceFieldTextureEffect& cte = other.cast<GrDistanceFieldTextureEffect>(); |
| return |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| fLuminance == cte.fLuminance && |
| #endif |
| fFlags == cte.fFlags; |
| } |
| |
| void GrDistanceFieldTextureEffect::onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const { |
| out->setUnknownSingleComponent(); |
| } |
| |
| void GrDistanceFieldTextureEffect::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldTextureEffect::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLPrimitiveProcessor* |
| GrDistanceFieldTextureEffect::createGLInstance(const GrBatchTracker& bt, |
| const GrGLCaps&) const { |
| return SkNEW_ARGS(GrGLDistanceFieldTextureEffect, (*this, bt)); |
| } |
| |
| void GrDistanceFieldTextureEffect::initBatchTracker(GrBatchTracker* bt, const GrPipelineInfo& init) const { |
| DistanceFieldBatchTracker* local = bt->cast<DistanceFieldBatchTracker>(); |
| local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init, |
| SkToBool(fInColor)); |
| local->fUsesLocalCoords = init.fUsesLocalCoords; |
| } |
| |
| bool GrDistanceFieldTextureEffect::onCanMakeEqual(const GrBatchTracker& m, |
| const GrGeometryProcessor& that, |
| const GrBatchTracker& t) const { |
| const DistanceFieldBatchTracker& mine = m.cast<DistanceFieldBatchTracker>(); |
| const DistanceFieldBatchTracker& theirs = t.cast<DistanceFieldBatchTracker>(); |
| return CanCombineLocalMatrices(*this, mine.fUsesLocalCoords, |
| that, theirs.fUsesLocalCoords) && |
| CanCombineOutput(mine.fInputColorType, mine.fColor, |
| theirs.fInputColorType, theirs.fColor); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldTextureEffect); |
| |
| GrGeometryProcessor* GrDistanceFieldTextureEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| int texIdx2 = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| #endif |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| GrTextureParams params2(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| #endif |
| |
| return GrDistanceFieldTextureEffect::Create(GrRandomColor(random), |
| GrProcessorUnitTest::TestMatrix(random), |
| textures[texIdx], params, |
| #ifdef SK_GAMMA_APPLY_TO_A8 |
| textures[texIdx2], params2, |
| random->nextF(), |
| #endif |
| random->nextBool() ? |
| kSimilarity_DistanceFieldEffectFlag : 0, |
| random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| struct DistanceFieldNoGammaBatchTracker { |
| GrGPInput fInputColorType; |
| GrColor fColor; |
| bool fUsesLocalCoords; |
| }; |
| |
| class GrGLDistanceFieldNoGammaTextureEffect : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldNoGammaTextureEffect(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fColor(GrColor_ILLEGAL), fTextureSize(SkISize::Make(-1, -1)) {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) SK_OVERRIDE{ |
| const GrDistanceFieldNoGammaTextureEffect& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldNoGammaTextureEffect>(); |
| |
| const DistanceFieldNoGammaBatchTracker& local = |
| args.fBT.cast<DistanceFieldNoGammaBatchTracker>(); |
| GrGLGPBuilder* pb = args.fPB; |
| GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| |
| // emit attributes |
| vsBuilder->emitAttributes(dfTexEffect); |
| |
| GrGLVertToFrag v(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &v, kHigh_GrSLPrecision); |
| |
| // setup pass through color |
| this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, |
| dfTexEffect.inColor(), &fColorUniform); |
| |
| vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| // Setup position |
| this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix()); |
| |
| // emit transforms |
| this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName, |
| dfTexEffect.localMatrix(), args.fTransformsIn, args.fTransformsOut); |
| |
| const char* textureSizeUniName = NULL; |
| fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec2f_GrSLType, kDefault_GrSLPrecision, |
| "TextureSize", &textureSizeUniName); |
| |
| // Use highp to work around aliasing issues |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 uv = %s;", v.fsIn()); |
| |
| fsBuilder->codeAppend("float texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], |
| "uv", |
| kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;"); |
| fsBuilder->codeAppend("float distance = " |
| SK_DistanceFieldMultiplier "*(texColor - " SK_DistanceFieldThreshold ");"); |
| |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 st = uv*%s;", textureSizeUniName); |
| fsBuilder->codeAppend("float afwidth;"); |
| if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) { |
| // For uniform scale, we adjust for the effect of the transformation on the distance |
| // by using the length of the gradient of the texture coordinates. We use st coordinates |
| // to ensure we're mapping 1:1 from texel space to pixel space. |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(st.x));"); |
| } else { |
| // For general transforms, to determine the amount of correction we multiply a unit |
| // vector pointing along the SDF gradient direction by the Jacobian of the st coords |
| // (which is the inverse transform for this fragment) and take the length of the result. |
| fsBuilder->codeAppend("vec2 dist_grad = vec2(dFdx(distance), dFdy(distance));"); |
| // the length of the gradient may be 0, so we need to check for this |
| // this also compensates for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fsBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fsBuilder->codeAppend("}"); |
| |
| fsBuilder->codeAppend("vec2 Jdx = dFdx(st);"); |
| fsBuilder->codeAppend("vec2 Jdy = dFdy(st);"); |
| fsBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| fsBuilder->codeAppend("float val = smoothstep(-afwidth, afwidth, distance);"); |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrPrimitiveProcessor& proc, |
| const GrBatchTracker& bt) SK_OVERRIDE { |
| SkASSERT(fTextureSizeUni.isValid()); |
| |
| GrTexture* texture = proc.texture(0); |
| if (texture->width() != fTextureSize.width() || |
| texture->height() != fTextureSize.height()) { |
| fTextureSize = SkISize::Make(texture->width(), texture->height()); |
| pdman.set2f(fTextureSizeUni, |
| SkIntToScalar(fTextureSize.width()), |
| SkIntToScalar(fTextureSize.height())); |
| } |
| |
| this->setUniformViewMatrix(pdman, proc.viewMatrix()); |
| |
| const DistanceFieldNoGammaBatchTracker& local = bt.cast<DistanceFieldNoGammaBatchTracker>(); |
| if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) { |
| GrGLfloat c[4]; |
| GrColorToRGBAFloat(local.fColor, c); |
| pdman.set4fv(fColorUniform, 1, c); |
| fColor = local.fColor; |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrBatchTracker& bt, |
| const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldNoGammaTextureEffect& dfTexEffect = |
| gp.cast<GrDistanceFieldNoGammaTextureEffect>(); |
| |
| const DistanceFieldNoGammaBatchTracker& local = bt.cast<DistanceFieldNoGammaBatchTracker>(); |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= local.fInputColorType << 16; |
| key |= local.fUsesLocalCoords && gp.localMatrix().hasPerspective() ? 0x1 << 24: 0x0; |
| key |= ComputePosKey(gp.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| UniformHandle fColorUniform; |
| UniformHandle fTextureSizeUni; |
| GrColor fColor; |
| SkISize fTextureSize; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldNoGammaTextureEffect::GrDistanceFieldNoGammaTextureEffect( |
| GrColor color, |
| const SkMatrix& viewMatrix, |
| GrTexture* texture, |
| const GrTextureParams& params, |
| uint32_t flags, |
| bool opaqueVertexColors) |
| : INHERITED(color, viewMatrix, SkMatrix::I(), opaqueVertexColors) |
| , fTextureAccess(texture, params) |
| , fFlags(flags & kNonLCD_DistanceFieldEffectMask) |
| , fInColor(NULL) { |
| SkASSERT(!(flags & ~kNonLCD_DistanceFieldEffectMask)); |
| this->initClassID<GrDistanceFieldNoGammaTextureEffect>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); |
| if (flags & kColorAttr_DistanceFieldEffectFlag) { |
| fInColor = &this->addVertexAttrib(Attribute("inColor", kVec4ub_GrVertexAttribType)); |
| this->setHasVertexColor(); |
| } |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2f_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| } |
| |
| bool GrDistanceFieldNoGammaTextureEffect::onIsEqual(const GrGeometryProcessor& other) const { |
| const GrDistanceFieldNoGammaTextureEffect& cte = |
| other.cast<GrDistanceFieldNoGammaTextureEffect>(); |
| return fFlags == cte.fFlags; |
| } |
| |
| void GrDistanceFieldNoGammaTextureEffect::onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const{ |
| out->setUnknownSingleComponent(); |
| } |
| |
| void GrDistanceFieldNoGammaTextureEffect::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldNoGammaTextureEffect::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLPrimitiveProcessor* |
| GrDistanceFieldNoGammaTextureEffect::createGLInstance(const GrBatchTracker& bt, |
| const GrGLCaps&) const { |
| return SkNEW_ARGS(GrGLDistanceFieldNoGammaTextureEffect, (*this, bt)); |
| } |
| |
| void GrDistanceFieldNoGammaTextureEffect::initBatchTracker(GrBatchTracker* bt, |
| const GrPipelineInfo& init) const { |
| DistanceFieldNoGammaBatchTracker* local = bt->cast<DistanceFieldNoGammaBatchTracker>(); |
| local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init, |
| SkToBool(fInColor)); |
| local->fUsesLocalCoords = init.fUsesLocalCoords; |
| } |
| |
| bool GrDistanceFieldNoGammaTextureEffect::onCanMakeEqual(const GrBatchTracker& m, |
| const GrGeometryProcessor& that, |
| const GrBatchTracker& t) const { |
| const DistanceFieldNoGammaBatchTracker& mine = m.cast<DistanceFieldNoGammaBatchTracker>(); |
| const DistanceFieldNoGammaBatchTracker& theirs = t.cast<DistanceFieldNoGammaBatchTracker>(); |
| return CanCombineLocalMatrices(*this, mine.fUsesLocalCoords, |
| that, theirs.fUsesLocalCoords) && |
| CanCombineOutput(mine.fInputColorType, mine.fColor, |
| theirs.fInputColorType, theirs.fColor); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldNoGammaTextureEffect); |
| |
| GrGeometryProcessor* GrDistanceFieldNoGammaTextureEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx |
| : GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode |
| : GrTextureParams::kNone_FilterMode); |
| |
| return GrDistanceFieldNoGammaTextureEffect::Create(GrRandomColor(random), |
| GrProcessorUnitTest::TestMatrix(random), |
| textures[texIdx], |
| params, |
| random->nextBool() ? kSimilarity_DistanceFieldEffectFlag : 0, random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| struct DistanceFieldLCDBatchTracker { |
| GrGPInput fInputColorType; |
| GrColor fColor; |
| bool fUsesLocalCoords; |
| }; |
| |
| class GrGLDistanceFieldLCDTextureEffect : public GrGLGeometryProcessor { |
| public: |
| GrGLDistanceFieldLCDTextureEffect(const GrGeometryProcessor&, |
| const GrBatchTracker&) |
| : fColor(GrColor_ILLEGAL) |
| , fTextColor(GrColor_ILLEGAL) {} |
| |
| void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) SK_OVERRIDE{ |
| const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| args.fGP.cast<GrDistanceFieldLCDTextureEffect>(); |
| const DistanceFieldLCDBatchTracker& local = args.fBT.cast<DistanceFieldLCDBatchTracker>(); |
| GrGLGPBuilder* pb = args.fPB; |
| |
| GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder(); |
| |
| // emit attributes |
| vsBuilder->emitAttributes(dfTexEffect); |
| |
| GrGLVertToFrag st(kVec2f_GrSLType); |
| args.fPB->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision); |
| vsBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName); |
| |
| GrGLVertToFrag uv(kVec2f_GrSLType); |
| args.fPB->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision); |
| // this is only used with text, so our texture bounds always match the glyph atlas |
| vsBuilder->codeAppendf("%s = vec2(" GR_FONT_ATLAS_A8_RECIP_WIDTH ", " |
| GR_FONT_ATLAS_RECIP_HEIGHT ")*%s;", uv.vsOut(), |
| dfTexEffect.inTextureCoords()->fName); |
| |
| // setup pass through color |
| this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, NULL, |
| &fColorUniform); |
| |
| // Setup position |
| this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix()); |
| |
| // emit transforms |
| this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName, |
| dfTexEffect.localMatrix(), args.fTransformsIn, args.fTransformsOut); |
| |
| GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder(); |
| |
| SkAssertResult(fsBuilder->enableFeature( |
| GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature)); |
| |
| // create LCD offset adjusted by inverse of transform |
| // Use highp to work around aliasing issues |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn()); |
| fsBuilder->codeAppend(GrGLShaderVar::PrecisionString(kHigh_GrSLPrecision, |
| pb->ctxInfo().standard())); |
| fsBuilder->codeAppendf("vec2 st = %s;\n", st.fsIn()); |
| bool isUniformScale = !!(dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask); |
| |
| if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) { |
| fsBuilder->codeAppend("float delta = -" GR_FONT_ATLAS_LCD_DELTA ";\n"); |
| } else { |
| fsBuilder->codeAppend("float delta = " GR_FONT_ATLAS_LCD_DELTA ";\n"); |
| } |
| if (isUniformScale) { |
| fsBuilder->codeAppend("\tfloat dx = dFdx(st.x);\n"); |
| fsBuilder->codeAppend("\tvec2 offset = vec2(dx*delta, 0.0);\n"); |
| } else { |
| fsBuilder->codeAppend("\tvec2 Jdx = dFdx(st);\n"); |
| fsBuilder->codeAppend("\tvec2 Jdy = dFdy(st);\n"); |
| fsBuilder->codeAppend("\tvec2 offset = delta*Jdx;\n"); |
| } |
| |
| // green is distance to uv center |
| fsBuilder->codeAppend("\tvec4 texColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tvec3 distance;\n"); |
| fsBuilder->codeAppend("\tdistance.y = texColor.r;\n"); |
| // red is distance to left offset |
| fsBuilder->codeAppend("\tvec2 uv_adjusted = uv - offset;\n"); |
| fsBuilder->codeAppend("\ttexColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], "uv_adjusted", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tdistance.x = texColor.r;\n"); |
| // blue is distance to right offset |
| fsBuilder->codeAppend("\tuv_adjusted = uv + offset;\n"); |
| fsBuilder->codeAppend("\ttexColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[0], "uv_adjusted", kVec2f_GrSLType); |
| fsBuilder->codeAppend(";\n"); |
| fsBuilder->codeAppend("\tdistance.z = texColor.r;\n"); |
| |
| fsBuilder->codeAppend("\tdistance = " |
| "vec3(" SK_DistanceFieldMultiplier ")*(distance - vec3(" SK_DistanceFieldThreshold"));"); |
| |
| // To be strictly correct, we should compute the anti-aliasing factor separately |
| // for each color component. However, this is only important when using perspective |
| // transformations, and even then using a single factor seems like a reasonable |
| // trade-off between quality and speed. |
| fsBuilder->codeAppend("float afwidth;"); |
| if (isUniformScale) { |
| // For uniform scale, we adjust for the effect of the transformation on the distance |
| // by using the length of the gradient of the texture coordinates. We use st coordinates |
| // to ensure we're mapping 1:1 from texel space to pixel space. |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dx);"); |
| } else { |
| // For general transforms, to determine the amount of correction we multiply a unit |
| // vector pointing along the SDF gradient direction by the Jacobian of the st coords |
| // (which is the inverse transform for this fragment) and take the length of the result. |
| fsBuilder->codeAppend("vec2 dist_grad = vec2(dFdx(distance.r), dFdy(distance.r));"); |
| // the length of the gradient may be 0, so we need to check for this |
| // this also compensates for the Adreno, which likes to drop tiles on division by 0 |
| fsBuilder->codeAppend("float dg_len2 = dot(dist_grad, dist_grad);"); |
| fsBuilder->codeAppend("if (dg_len2 < 0.0001) {"); |
| fsBuilder->codeAppend("dist_grad = vec2(0.7071, 0.7071);"); |
| fsBuilder->codeAppend("} else {"); |
| fsBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);"); |
| fsBuilder->codeAppend("}"); |
| fsBuilder->codeAppend("vec2 grad = vec2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,"); |
| fsBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);"); |
| |
| // this gives us a smooth step across approximately one fragment |
| fsBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);"); |
| } |
| |
| fsBuilder->codeAppend("vec4 val = vec4(smoothstep(vec3(-afwidth), vec3(afwidth), distance), 1.0);"); |
| |
| // adjust based on gamma |
| const char* textColorUniName = NULL; |
| fTextColorUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility, |
| kVec3f_GrSLType, kDefault_GrSLPrecision, |
| "TextColor", &textColorUniName); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val.x, %s.x);\n", textColorUniName); |
| fsBuilder->codeAppend("float gammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;\n"); |
| fsBuilder->codeAppend("\tval.x = gammaColor;\n"); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val.y, %s.y);\n", textColorUniName); |
| fsBuilder->codeAppend("\tgammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;\n"); |
| fsBuilder->codeAppend("\tval.y = gammaColor;\n"); |
| |
| fsBuilder->codeAppendf("\tuv = vec2(val.z, %s.z);\n", textColorUniName); |
| fsBuilder->codeAppend("\tgammaColor = "); |
| fsBuilder->appendTextureLookup(args.fSamplers[1], "uv", kVec2f_GrSLType); |
| fsBuilder->codeAppend(".r;\n"); |
| fsBuilder->codeAppend("\tval.z = gammaColor;\n"); |
| |
| fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage); |
| } |
| |
| virtual void setData(const GrGLProgramDataManager& pdman, |
| const GrPrimitiveProcessor& processor, |
| const GrBatchTracker& bt) SK_OVERRIDE { |
| SkASSERT(fTextColorUni.isValid()); |
| |
| const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| processor.cast<GrDistanceFieldLCDTextureEffect>(); |
| GrColor textColor = dfTexEffect.getTextColor(); |
| if (textColor != fTextColor) { |
| static const float ONE_OVER_255 = 1.f / 255.f; |
| pdman.set3f(fTextColorUni, |
| GrColorUnpackR(textColor) * ONE_OVER_255, |
| GrColorUnpackG(textColor) * ONE_OVER_255, |
| GrColorUnpackB(textColor) * ONE_OVER_255); |
| fTextColor = textColor; |
| } |
| |
| this->setUniformViewMatrix(pdman, processor.viewMatrix()); |
| |
| const DistanceFieldLCDBatchTracker& local = bt.cast<DistanceFieldLCDBatchTracker>(); |
| if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) { |
| GrGLfloat c[4]; |
| GrColorToRGBAFloat(local.fColor, c); |
| pdman.set4fv(fColorUniform, 1, c); |
| fColor = local.fColor; |
| } |
| } |
| |
| static inline void GenKey(const GrGeometryProcessor& gp, |
| const GrBatchTracker& bt, |
| const GrGLCaps&, |
| GrProcessorKeyBuilder* b) { |
| const GrDistanceFieldLCDTextureEffect& dfTexEffect = |
| gp.cast<GrDistanceFieldLCDTextureEffect>(); |
| |
| const DistanceFieldLCDBatchTracker& local = bt.cast<DistanceFieldLCDBatchTracker>(); |
| uint32_t key = dfTexEffect.getFlags(); |
| key |= local.fInputColorType << 16; |
| key |= local.fUsesLocalCoords && gp.localMatrix().hasPerspective() ? 0x1 << 24: 0x0; |
| key |= ComputePosKey(gp.viewMatrix()) << 25; |
| b->add32(key); |
| } |
| |
| private: |
| GrColor fColor; |
| UniformHandle fColorUniform; |
| UniformHandle fTextColorUni; |
| SkColor fTextColor; |
| |
| typedef GrGLGeometryProcessor INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GrDistanceFieldLCDTextureEffect::GrDistanceFieldLCDTextureEffect( |
| GrColor color, const SkMatrix& viewMatrix, |
| GrTexture* texture, const GrTextureParams& params, |
| GrTexture* gamma, const GrTextureParams& gParams, |
| SkColor textColor, |
| uint32_t flags) |
| : INHERITED(color, viewMatrix, SkMatrix::I()) |
| , fTextureAccess(texture, params) |
| , fGammaTextureAccess(gamma, gParams) |
| , fTextColor(textColor) |
| , fFlags(flags & kLCD_DistanceFieldEffectMask){ |
| SkASSERT(!(flags & ~kLCD_DistanceFieldEffectMask) && (flags & kUseLCD_DistanceFieldEffectFlag)); |
| this->initClassID<GrDistanceFieldLCDTextureEffect>(); |
| fInPosition = &this->addVertexAttrib(Attribute("inPosition", kVec2f_GrVertexAttribType)); |
| fInTextureCoords = &this->addVertexAttrib(Attribute("inTextureCoords", |
| kVec2s_GrVertexAttribType)); |
| this->addTextureAccess(&fTextureAccess); |
| this->addTextureAccess(&fGammaTextureAccess); |
| } |
| |
| bool GrDistanceFieldLCDTextureEffect::onIsEqual(const GrGeometryProcessor& other) const { |
| const GrDistanceFieldLCDTextureEffect& cte = other.cast<GrDistanceFieldLCDTextureEffect>(); |
| return (fTextColor == cte.fTextColor && |
| fFlags == cte.fFlags); |
| } |
| |
| void GrDistanceFieldLCDTextureEffect::onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const { |
| out->setUnknownFourComponents(); |
| out->setUsingLCDCoverage(); |
| } |
| |
| void GrDistanceFieldLCDTextureEffect::getGLProcessorKey(const GrBatchTracker& bt, |
| const GrGLCaps& caps, |
| GrProcessorKeyBuilder* b) const { |
| GrGLDistanceFieldLCDTextureEffect::GenKey(*this, bt, caps, b); |
| } |
| |
| GrGLPrimitiveProcessor* |
| GrDistanceFieldLCDTextureEffect::createGLInstance(const GrBatchTracker& bt, |
| const GrGLCaps&) const { |
| return SkNEW_ARGS(GrGLDistanceFieldLCDTextureEffect, (*this, bt)); |
| } |
| |
| void GrDistanceFieldLCDTextureEffect::initBatchTracker(GrBatchTracker* bt, |
| const GrPipelineInfo& init) const { |
| DistanceFieldLCDBatchTracker* local = bt->cast<DistanceFieldLCDBatchTracker>(); |
| local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init, false); |
| local->fUsesLocalCoords = init.fUsesLocalCoords; |
| } |
| |
| bool GrDistanceFieldLCDTextureEffect::onCanMakeEqual(const GrBatchTracker& m, |
| const GrGeometryProcessor& that, |
| const GrBatchTracker& t) const { |
| const DistanceFieldLCDBatchTracker& mine = m.cast<DistanceFieldLCDBatchTracker>(); |
| const DistanceFieldLCDBatchTracker& theirs = t.cast<DistanceFieldLCDBatchTracker>(); |
| return CanCombineLocalMatrices(*this, mine.fUsesLocalCoords, |
| that, theirs.fUsesLocalCoords) && |
| CanCombineOutput(mine.fInputColorType, mine.fColor, |
| theirs.fInputColorType, theirs.fColor); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_GEOMETRY_PROCESSOR_TEST(GrDistanceFieldLCDTextureEffect); |
| |
| GrGeometryProcessor* GrDistanceFieldLCDTextureEffect::TestCreate(SkRandom* random, |
| GrContext*, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| int texIdx = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| int texIdx2 = random->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx : |
| GrProcessorUnitTest::kAlphaTextureIdx; |
| static const SkShader::TileMode kTileModes[] = { |
| SkShader::kClamp_TileMode, |
| SkShader::kRepeat_TileMode, |
| SkShader::kMirror_TileMode, |
| }; |
| SkShader::TileMode tileModes[] = { |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| kTileModes[random->nextULessThan(SK_ARRAY_COUNT(kTileModes))], |
| }; |
| GrTextureParams params(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| GrTextureParams params2(tileModes, random->nextBool() ? GrTextureParams::kBilerp_FilterMode : |
| GrTextureParams::kNone_FilterMode); |
| GrColor textColor = GrColorPackRGBA(random->nextULessThan(256), |
| random->nextULessThan(256), |
| random->nextULessThan(256), |
| random->nextULessThan(256)); |
| uint32_t flags = kUseLCD_DistanceFieldEffectFlag; |
| flags |= random->nextBool() ? kUniformScale_DistanceFieldEffectMask : 0; |
| flags |= random->nextBool() ? kBGR_DistanceFieldEffectFlag : 0; |
| return GrDistanceFieldLCDTextureEffect::Create(GrRandomColor(random), |
| GrProcessorUnitTest::TestMatrix(random), |
| textures[texIdx], params, |
| textures[texIdx2], params2, |
| textColor, |
| flags); |
| } |