void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const QuadEdgeEffect& qe = args.fGP.cast<QuadEdgeEffect>();
GrGLGPBuilder* pb = args.fPB;
GrGLVertexBuilder* vsBuilder = pb->getVertexShaderBuilder();
// emit attributes
vsBuilder->emitAttributes(qe);
GrGLVertToFrag v(kVec4f_GrSLType);
args.fPB->addVarying("QuadEdge", &v);
vsBuilder->codeAppendf("%s = %s;", v.vsOut(), qe.inQuadEdge()->fName);
const BatchTracker& local = args.fBT.cast<BatchTracker>();
// Setup pass through color
this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, NULL,
&fColorUniform);
// Setup position
this->setupPosition(pb, gpArgs, qe.inPosition()->fName, qe.viewMatrix());
// emit transforms
this->emitTransforms(args.fPB, gpArgs->fPositionVar, qe.inPosition()->fName,
qe.localMatrix(), args.fTransformsIn, args.fTransformsOut);
GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("float edgeAlpha;");
// keep the derivative instructions outside the conditional
fsBuilder->codeAppendf("vec2 duvdx = dFdx(%s.xy);", v.fsIn());
fsBuilder->codeAppendf("vec2 duvdy = dFdy(%s.xy);", v.fsIn());
fsBuilder->codeAppendf("if (%s.z > 0.0 && %s.w > 0.0) {", v.fsIn(), v.fsIn());
// today we know z and w are in device space. We could use derivatives
fsBuilder->codeAppendf("edgeAlpha = min(min(%s.z, %s.w) + 0.5, 1.0);", v.fsIn(),
v.fsIn());
fsBuilder->codeAppendf ("} else {");
fsBuilder->codeAppendf("vec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,"
" 2.0*%s.x*duvdy.x - duvdy.y);",
v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("edgeAlpha = (%s.x*%s.x - %s.y);", v.fsIn(), v.fsIn(),
v.fsIn());
fsBuilder->codeAppendf("edgeAlpha = "
"clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);}");
fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
const GrDistanceFieldLCDTextGeoProc& dfTexEffect =
args.fGP.cast<GrDistanceFieldLCDTextGeoProc>();
GrGLGPBuilder* pb = args.fPB;
GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
// emit attributes
vsBuilder->emitAttributes(dfTexEffect);
// setup pass through color
if (!dfTexEffect.colorIgnored()) {
this->setupUniformColor(pb, args.fOutputColor, &fColorUniform);
}
// Setup position
this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix(),
&fViewMatrixUniform);
// emit transforms
this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName,
args.fTransformsIn, args.fTransformsOut);
// set up varyings
bool isUniformScale = SkToBool(dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask);
GrGLVertToFrag recipScale(kFloat_GrSLType);
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);
// add frag shader code
GrGLFragmentBuilder* 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()));
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->codeAppendf("float dy = abs(dFdy(%s.y));", st.fsIn());
fsBuilder->codeAppend("vec2 offset = vec2(dy*delta, 0.0);");
} else {
fsBuilder->codeAppendf("vec2 st = %s;\n", st.fsIn());
fsBuilder->codeAppend("vec2 Jdx = dFdx(st);");
fsBuilder->codeAppend("vec2 Jdy = dFdy(st);");
fsBuilder->codeAppend("vec2 offset = delta*Jdx;");
}
// 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"));");
// adjust width based on gamma
const char* distanceAdjustUniName = NULL;
fDistanceAdjustUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kVec3f_GrSLType, kDefault_GrSLPrecision,
"DistanceAdjust", &distanceAdjustUniName);
fsBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName);
// 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 = " SK_DistanceFieldAAFactor "*dy;");
} 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);");
fsBuilder->codeAppendf("%s = vec4(val);", args.fOutputCoverage);
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
const GrDistanceFieldA8TextGeoProc& dfTexEffect =
args.fGP.cast<GrDistanceFieldA8TextGeoProc>();
GrGLGPBuilder* pb = args.fPB;
GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
// emit attributes
vsBuilder->emitAttributes(dfTexEffect);
#ifdef SK_GAMMA_APPLY_TO_A8
// adjust based on gamma
const char* distanceAdjustUniName = NULL;
// width, height, 1/(3*width)
fDistanceAdjustUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType, kDefault_GrSLPrecision,
"DistanceAdjust", &distanceAdjustUniName);
#endif
// Setup pass through color
if (!dfTexEffect.colorIgnored()) {
if (dfTexEffect.hasVertexColor()) {
pb->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
} else {
this->setupUniformColor(pb, args.fOutputColor, &fColorUniform);
}
}
// Setup position
this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix(),
&fViewMatrixUniform);
// emit transforms
this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName,
args.fTransformsIn, args.fTransformsOut);
// add varyings
GrGLVertToFrag recipScale(kFloat_GrSLType);
GrGLVertToFrag st(kVec2f_GrSLType);
bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
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);
// 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 ");");
#ifdef SK_GAMMA_APPLY_TO_A8
// adjust width based on gamma
fsBuilder->codeAppendf("distance -= %s;", distanceAdjustUniName);
#endif
fsBuilder->codeAppend("float afwidth;");
if (isSimilarity) {
// 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
// we use y to work around a Mali400 bug in the x direction
fsBuilder->codeAppendf("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdy(%s.y));",
st.fsIn());
} 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->codeAppendf("vec2 Jdx = dFdx(%s);", st.fsIn());
fsBuilder->codeAppendf("vec2 Jdy = dFdy(%s);", st.fsIn());
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);
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
const GrDistanceFieldPathGeoProc& dfTexEffect = args.fGP.cast<GrDistanceFieldPathGeoProc>();
GrGLGPBuilder* pb = args.fPB;
GrGLFragmentBuilder* 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
if (!dfTexEffect.colorIgnored()) {
if (dfTexEffect.hasVertexColor()) {
pb->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
} else {
this->setupUniformColor(pb, args.fOutputColor, &fColorUniform);
}
}
vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName);
// Setup position
this->setupPosition(pb, gpArgs, dfTexEffect.inPosition()->fName, dfTexEffect.viewMatrix(),
&fViewMatrixUniform);
// emit transforms
this->emitTransforms(args.fPB, gpArgs->fPositionVar, dfTexEffect.inPosition()->fName,
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 "*dFdy(st.y));");
} 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);
}
void GrGLConicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
GrGLGPBuilder* pb = args.fPB;
GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
const GrConicEffect& gp = args.fGP.cast<GrConicEffect>();
const ConicBatchTracker& local = args.fBT.cast<ConicBatchTracker>();
// emit attributes
vsBuilder->emitAttributes(gp);
GrGLVertToFrag v(kVec4f_GrSLType);
args.fPB->addVarying("ConicCoeffs", &v);
vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inConicCoeffs()->fName);
// Setup pass through color
this->setupColorPassThrough(args.fPB, local.fInputColorType, args.fOutputColor, NULL,
&fColorUniform);
// Setup position
this->setupPosition(pb, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
// emit transforms with position
this->emitTransforms(pb, gpArgs->fPositionVar, gp.inPosition()->fName, gp.localMatrix(),
args.fTransformsIn, args.fTransformsOut);
GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
fsBuilder->codeAppend("float edgeAlpha;");
switch (fEdgeType) {
case kHairlineAA_GrProcessorEdgeType: {
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("vec3 dklmdx = dFdx(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("vec3 dklmdy = dFdy(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("float dfdx ="
"2.0 * %s.x * dklmdx.x - %s.y * dklmdx.z - %s.z * dklmdx.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("float dfdy ="
"2.0 * %s.x * dklmdy.x - %s.y * dklmdy.z - %s.z * dklmdy.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppend("vec2 gF = vec2(dfdx, dfdy);");
fsBuilder->codeAppend("float gFM = sqrt(dot(gF, gF));");
fsBuilder->codeAppendf("float func = %s.x*%s.x - %s.y*%s.z;", v.fsIn(), v.fsIn(),
v.fsIn(), v.fsIn());
fsBuilder->codeAppend("func = abs(func);");
fsBuilder->codeAppend("edgeAlpha = func / gFM;");
fsBuilder->codeAppend("edgeAlpha = max(1.0 - edgeAlpha, 0.0);");
// Add line below for smooth cubic ramp
// fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
break;
}
case kFillAA_GrProcessorEdgeType: {
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("vec3 dklmdx = dFdx(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("vec3 dklmdy = dFdy(%s.xyz);", v.fsIn());
fsBuilder->codeAppendf("float dfdx ="
"2.0 * %s.x * dklmdx.x - %s.y * dklmdx.z - %s.z * dklmdx.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("float dfdy ="
"2.0 * %s.x * dklmdy.x - %s.y * dklmdy.z - %s.z * dklmdy.y;",
v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppend("vec2 gF = vec2(dfdx, dfdy);");
fsBuilder->codeAppend("float gFM = sqrt(dot(gF, gF));");
fsBuilder->codeAppendf("float func = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
v.fsIn(), v.fsIn());
fsBuilder->codeAppend("edgeAlpha = func / gFM;");
fsBuilder->codeAppend("edgeAlpha = clamp(1.0 - edgeAlpha, 0.0, 1.0);");
// Add line below for smooth cubic ramp
// fsBuilder->codeAppend("edgeAlpha = edgeAlpha*edgeAlpha*(3.0-2.0*edgeAlpha);");
break;
}
case kFillBW_GrProcessorEdgeType: {
fsBuilder->codeAppendf("edgeAlpha = %s.x * %s.x - %s.y * %s.z;", v.fsIn(), v.fsIn(),
v.fsIn(), v.fsIn());
fsBuilder->codeAppend("edgeAlpha = float(edgeAlpha < 0.0);");
break;
}
default:
SkFAIL("Shouldn't get here");
}
if (0xff != local.fCoverageScale) {
const char* coverageScale;
fCoverageScaleUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType,
kDefault_GrSLPrecision,
"Coverage",
&coverageScale);
fsBuilder->codeAppendf("%s = vec4(%s * edgeAlpha);", args.fOutputCoverage, coverageScale);
} else {
fsBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
}
}
void GrGLCubicEffect::onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) {
GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
const GrCubicEffect& gp = args.fGP.cast<GrCubicEffect>();
const CubicBatchTracker& local = args.fBT.cast<CubicBatchTracker>();
// emit attributes
vsBuilder->emitAttributes(gp);
GrGLVertToFrag v(kVec4f_GrSLType);
args.fPB->addVarying("CubicCoeffs", &v, kHigh_GrSLPrecision);
vsBuilder->codeAppendf("%s = %s;", v.vsOut(), gp.inCubicCoeffs()->fName);
// Setup pass through color
this->setupColorPassThrough(args.fPB, local.fInputColorType, args.fOutputColor, NULL,
&fColorUniform);
// Setup position
this->setupPosition(args.fPB, gpArgs, gp.inPosition()->fName, gp.viewMatrix());
// emit transforms with position
this->emitTransforms(args.fPB, gpArgs->fPositionVar, gp.inPosition()->fName, args.fTransformsIn,
args.fTransformsOut);
GrGLFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
GrGLShaderVar edgeAlpha("edgeAlpha", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar dklmdx("dklmdx", kVec3f_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar dklmdy("dklmdy", kVec3f_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar dfdx("dfdx", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar dfdy("dfdy", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar gF("gF", kVec2f_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar gFM("gFM", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
GrGLShaderVar func("func", kFloat_GrSLType, 0, kHigh_GrSLPrecision);
fsBuilder->declAppend(edgeAlpha);
fsBuilder->declAppend(dklmdx);
fsBuilder->declAppend(dklmdy);
fsBuilder->declAppend(dfdx);
fsBuilder->declAppend(dfdy);
fsBuilder->declAppend(gF);
fsBuilder->declAppend(gFM);
fsBuilder->declAppend(func);
switch (fEdgeType) {
case kHairlineAA_GrProcessorEdgeType: {
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
fsBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
fsBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
dfdx.c_str(), v.fsIn(), v.fsIn(), dklmdx.c_str(), v.fsIn(),
dklmdx.c_str(), v.fsIn(), dklmdx.c_str());
fsBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
dfdy.c_str(), v.fsIn(), v.fsIn(), dklmdy.c_str(), v.fsIn(),
dklmdy.c_str(), v.fsIn(), dklmdy.c_str());
fsBuilder->codeAppendf("%s = vec2(%s, %s);", gF.c_str(), dfdx.c_str(), dfdy.c_str());
fsBuilder->codeAppendf("%s = sqrt(dot(%s, %s));", gFM.c_str(), gF.c_str(), gF.c_str());
fsBuilder->codeAppendf("%s = %s.x * %s.x * %s.x - %s.y * %s.z;",
func.c_str(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("%s = abs(%s);", func.c_str(), func.c_str());
fsBuilder->codeAppendf("%s = %s / %s;",
edgeAlpha.c_str(), func.c_str(), gFM.c_str());
fsBuilder->codeAppendf("%s = max(1.0 - %s, 0.0);",
edgeAlpha.c_str(), edgeAlpha.c_str());
// Add line below for smooth cubic ramp
// fsBuilder->codeAppendf("%s = %s * %s * (3.0 - 2.0 * %s);",
// edgeAlpha.c_str(), edgeAlpha.c_str(), edgeAlpha.c_str(),
// edgeAlpha.c_str());
break;
}
case kFillAA_GrProcessorEdgeType: {
SkAssertResult(fsBuilder->enableFeature(
GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
fsBuilder->codeAppendf("%s = dFdx(%s.xyz);", dklmdx.c_str(), v.fsIn());
fsBuilder->codeAppendf("%s = dFdy(%s.xyz);", dklmdy.c_str(), v.fsIn());
fsBuilder->codeAppendf("%s ="
"3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
dfdx.c_str(), v.fsIn(), v.fsIn(), dklmdx.c_str(), v.fsIn(),
dklmdx.c_str(), v.fsIn(), dklmdx.c_str());
fsBuilder->codeAppendf("%s = 3.0 * %s.x * %s.x * %s.x - %s.y * %s.z - %s.z * %s.y;",
dfdy.c_str(), v.fsIn(), v.fsIn(), dklmdy.c_str(), v.fsIn(),
dklmdy.c_str(), v.fsIn(), dklmdy.c_str());
fsBuilder->codeAppendf("%s = vec2(%s, %s);", gF.c_str(), dfdx.c_str(), dfdy.c_str());
fsBuilder->codeAppendf("%s = sqrt(dot(%s, %s));", gFM.c_str(), gF.c_str(), gF.c_str());
fsBuilder->codeAppendf("%s = %s.x * %s.x * %s.x - %s.y * %s.z;",
func.c_str(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("%s = %s / %s;",
edgeAlpha.c_str(), func.c_str(), gFM.c_str());
fsBuilder->codeAppendf("%s = clamp(1.0 - %s, 0.0, 1.0);",
edgeAlpha.c_str(), edgeAlpha.c_str());
// Add line below for smooth cubic ramp
// fsBuilder->codeAppendf("%s = %s * %s * (3.0 - 2.0 * %s);",
// edgeAlpha.c_str(), edgeAlpha.c_str(), edgeAlpha.c_str(),
// edgeAlpha.c_str());
break;
}
case kFillBW_GrProcessorEdgeType: {
fsBuilder->codeAppendf("%s = %s.x * %s.x * %s.x - %s.y * %s.z;",
edgeAlpha.c_str(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn(), v.fsIn());
fsBuilder->codeAppendf("%s = float(%s < 0.0);", edgeAlpha.c_str(), edgeAlpha.c_str());
break;
}
default:
SkFAIL("Shouldn't get here");
}
fsBuilder->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, edgeAlpha.c_str());
}
