void emitCode(EmitArgs& args) override {
GrBlurredEdgeFP::Mode mode = args.fFp.cast<GrBlurredEdgeFP>().mode();
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("vec4 color = %s;", args.fInputColor);
if (!args.fGpImplementsDistanceVector) {
fragBuilder->codeAppendf("// assuming interpolant is set in vertex colors\n");
fragBuilder->codeAppendf("float factor = 1.0 - color.b;");
} else {
fragBuilder->codeAppendf("// using distance to edge to compute interpolant\n");
fragBuilder->codeAppend("float radius = color.r*256.0*64.0 + color.g*64.0;");
fragBuilder->codeAppend("float pad = color.b*64.0;");
fragBuilder->codeAppendf("float factor = 1.0 - clamp((%s.z - pad)/radius, 0.0, 1.0);",
fragBuilder->distanceVectorName());
}
switch (mode) {
case GrBlurredEdgeFP::kGaussian_Mode:
fragBuilder->codeAppend("factor = exp(-factor * factor * 4.0) - 0.018;");
break;
case GrBlurredEdgeFP::kSmoothstep_Mode:
fragBuilder->codeAppend("factor = smoothstep(factor, 0.0, 1.0);");
break;
}
if (!args.fGpImplementsDistanceVector) {
fragBuilder->codeAppendf("%s = vec4(factor*color.g);", args.fOutputColor);
} else {
fragBuilder->codeAppendf("%s = vec4(factor*color.a);", args.fOutputColor);
}
}
void onEmitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
// add uniform
const char* xformUniName = nullptr;
fXformUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kMat22f_GrSLType,
kDefault_GrSLPrecision, "Xform", &xformUniName);
SkString dstNormalColorName("dstNormalColor");
this->emitChild(0, nullptr, &dstNormalColorName, args);
fragBuilder->codeAppendf("vec3 normal = normalize(%s.rgb - vec3(0.5));",
dstNormalColorName.c_str());
// If there's no x & y components, return (0, 0, +/- 1) instead to avoid division by 0
fragBuilder->codeAppend( "if (abs(normal.z) > 0.999) {");
fragBuilder->codeAppendf(" %s = normalize(vec4(0.0, 0.0, normal.z, 0.0));",
args.fOutputColor);
// Else, Normalizing the transformed X and Y, while keeping constant both Z and the
// vector's angle in the XY plane. This maintains the "slope" for the surface while
// appropriately rotating the normal regardless of any anisotropic scaling that occurs.
// Here, we call 'scaling factor' the number that must divide the transformed X and Y so
// that the normal's length remains equal to 1.
fragBuilder->codeAppend( "} else {");
fragBuilder->codeAppendf(" vec2 transformed = %s * normal.xy;",
xformUniName);
fragBuilder->codeAppend( " float scalingFactorSquared = "
"( (transformed.x * transformed.x) "
"+ (transformed.y * transformed.y) )"
"/(1.0 - (normal.z * normal.z));");
fragBuilder->codeAppendf(" %s = vec4(transformed*inversesqrt(scalingFactorSquared),"
"normal.z, 0.0);",
args.fOutputColor);
fragBuilder->codeAppend( "}");
}
void GrCircleBlurFragmentProcessor::GLSLProcessor::emitCode(EmitArgs& args) {
const char *dataName;
// The data is formatted as:
// x,y - the center of the circle
// z - inner radius that should map to 0th entry in the texture.
// w - the inverse of the distance over which the texture is stretched.
fDataUniform = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kVec4f_GrSLType,
kDefault_GrSLPrecision,
"data",
&dataName);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
if (args.fInputColor) {
fragBuilder->codeAppendf("vec4 src=%s;", args.fInputColor);
} else {
fragBuilder->codeAppendf("vec4 src=vec4(1);");
}
// We just want to compute "(length(vec) - %s.z + 0.5) * %s.w" but need to rearrange
// for precision.
fragBuilder->codeAppendf("vec2 vec = vec2( (sk_FragCoord.x - %s.x) * %s.w, "
"(sk_FragCoord.y - %s.y) * %s.w );",
dataName, dataName, dataName, dataName);
fragBuilder->codeAppendf("float dist = length(vec) + (0.5 - %s.z) * %s.w;",
dataName, dataName);
fragBuilder->codeAppendf("float intensity = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "vec2(dist, 0.5)");
fragBuilder->codeAppend(".a;");
fragBuilder->codeAppendf("%s = src * intensity;\n", args.fOutputColor );
}
void emitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("%s = ", args.fOutputColor);
fragBuilder->appendTextureLookupAndModulate(args.fInputColor,
args.fSamplers[0],
args.fCoords[0].c_str(),
args.fCoords[0].getType());
fragBuilder->codeAppend(";");
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const GrBitmapTextGeoProc& btgp = args.fGP.cast<GrBitmapTextGeoProc>();
GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
// emit attributes
varyingHandler->emitAttributes(btgp);
const char* atlasSizeInvName;
fAtlasSizeInvUniform = uniformHandler->addUniform(kVertex_GrShaderFlag,
kFloat2_GrSLType,
kHigh_GrSLPrecision,
"AtlasSizeInv",
&atlasSizeInvName);
GrGLSLVarying uv(kFloat2_GrSLType);
GrSLType texIdxType = args.fShaderCaps->integerSupport() ? kInt_GrSLType : kFloat_GrSLType;
GrGLSLVarying texIdx(texIdxType);
append_index_uv_varyings(args, btgp.inTextureCoords().name(), atlasSizeInvName, &uv,
&texIdx, nullptr);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// Setup pass through color
if (btgp.hasVertexColor()) {
varyingHandler->addPassThroughAttribute(btgp.inColor(), args.fOutputColor);
} else {
this->setupUniformColor(fragBuilder, uniformHandler, args.fOutputColor,
&fColorUniform);
}
// Setup position
gpArgs->fPositionVar = btgp.inPosition().asShaderVar();
// emit transforms
this->emitTransforms(vertBuilder,
varyingHandler,
uniformHandler,
btgp.inPosition().asShaderVar(),
btgp.localMatrix(),
args.fFPCoordTransformHandler);
fragBuilder->codeAppend("half4 texColor;");
append_multitexture_lookup(args, btgp.numTextureSamplers(),
texIdx, uv.fsIn(), "texColor");
if (btgp.maskFormat() == kARGB_GrMaskFormat) {
// modulate by color
fragBuilder->codeAppendf("%s = %s * texColor;", args.fOutputColor, args.fOutputColor);
fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
} else {
fragBuilder->codeAppendf("%s = texColor;", args.fOutputCoverage);
}
}
void GrColorCubeEffect::GLSLProcessor::emitCode(EmitArgs& args) {
if (nullptr == args.fInputColor) {
args.fInputColor = "vec4(1)";
}
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fColorCubeSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"Size");
const char* colorCubeSizeUni = uniformHandler->getUniformCStr(fColorCubeSizeUni);
fColorCubeInvSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"InvSize");
const char* colorCubeInvSizeUni = uniformHandler->getUniformCStr(fColorCubeInvSizeUni);
const char* nonZeroAlpha = "nonZeroAlpha";
const char* unPMColor = "unPMColor";
const char* cubeIdx = "cubeIdx";
const char* cCoords1 = "cCoords1";
const char* cCoords2 = "cCoords2";
// Note: if implemented using texture3D in OpenGL ES older than OpenGL ES 3.0,
// the shader might need "#extension GL_OES_texture_3D : enable".
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// Unpremultiply color
fragBuilder->codeAppendf("\tfloat %s = max(%s.a, 0.00001);\n", nonZeroAlpha, args.fInputColor);
fragBuilder->codeAppendf("\tvec4 %s = vec4(%s.rgb / %s, %s);\n",
unPMColor, args.fInputColor, nonZeroAlpha, nonZeroAlpha);
// Fit input color into the cube.
fragBuilder->codeAppendf(
"vec3 %s = vec3(%s.rg * vec2((%s - 1.0) * %s) + vec2(0.5 * %s), %s.b * (%s - 1.0));\n",
cubeIdx, unPMColor, colorCubeSizeUni, colorCubeInvSizeUni, colorCubeInvSizeUni,
unPMColor, colorCubeSizeUni);
// Compute y coord for for texture fetches.
fragBuilder->codeAppendf("vec2 %s = vec2(%s.r, (floor(%s.b) + %s.g) * %s);\n",
cCoords1, cubeIdx, cubeIdx, cubeIdx, colorCubeInvSizeUni);
fragBuilder->codeAppendf("vec2 %s = vec2(%s.r, (ceil(%s.b) + %s.g) * %s);\n",
cCoords2, cubeIdx, cubeIdx, cubeIdx, colorCubeInvSizeUni);
// Apply the cube.
fragBuilder->codeAppendf("%s = vec4(mix(", args.fOutputColor);
fragBuilder->appendTextureLookup(args.fSamplers[0], cCoords1);
fragBuilder->codeAppend(".bgr, ");
fragBuilder->appendTextureLookup(args.fSamplers[0], cCoords2);
// Premultiply color by alpha. Note that the input alpha is not modified by this shader.
fragBuilder->codeAppendf(".bgr, fract(%s.b)) * vec3(%s), %s.a);\n",
cubeIdx, nonZeroAlpha, args.fInputColor);
}
void GrGLConvexPolyEffect::emitCode(EmitArgs& args) {
const GrConvexPolyEffect& cpe = args.fFp.cast<GrConvexPolyEffect>();
const char *edgeArrayName;
fEdgeUniform = args.fUniformHandler->addUniformArray(kFragment_GrShaderFlag,
kVec3f_GrSLType,
kDefault_GrSLPrecision,
"edges",
cpe.getEdgeCount(),
&edgeArrayName);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppend("\t\tfloat alpha = 1.0;\n");
fragBuilder->codeAppend("\t\tfloat edge;\n");
const char* fragmentPos = fragBuilder->fragmentPosition();
for (int i = 0; i < cpe.getEdgeCount(); ++i) {
fragBuilder->codeAppendf("\t\tedge = dot(%s[%d], vec3(%s.x, %s.y, 1));\n",
edgeArrayName, i, fragmentPos, fragmentPos);
if (GrProcessorEdgeTypeIsAA(cpe.getEdgeType())) {
fragBuilder->codeAppend("\t\tedge = clamp(edge, 0.0, 1.0);\n");
} else {
fragBuilder->codeAppend("\t\tedge = edge >= 0.5 ? 1.0 : 0.0;\n");
}
fragBuilder->codeAppend("\t\talpha *= edge;\n");
}
if (GrProcessorEdgeTypeIsInverseFill(cpe.getEdgeType())) {
fragBuilder->codeAppend("\talpha = 1.0 - alpha;\n");
}
fragBuilder->codeAppendf("\t%s = %s;\n", args.fOutputColor,
(GrGLSLExpr4(args.fInputColor) * GrGLSLExpr1("alpha")).c_str());
}
void GLAARectEffect::emitCode(EmitArgs& args) {
const AARectEffect& aare = args.fFp.cast<AARectEffect>();
const char *rectName;
// The rect uniform's xyzw refer to (left + 0.5, top + 0.5, right - 0.5, bottom - 0.5),
// respectively.
fRectUniform = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kVec4f_GrSLType,
kDefault_GrSLPrecision,
"rect",
&rectName);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
const char* fragmentPos = fragBuilder->fragmentPosition();
if (GrProcessorEdgeTypeIsAA(aare.getEdgeType())) {
// The amount of coverage removed in x and y by the edges is computed as a pair of negative
// numbers, xSub and ySub.
fragBuilder->codeAppend("\t\tfloat xSub, ySub;\n");
fragBuilder->codeAppendf("\t\txSub = min(%s.x - %s.x, 0.0);\n", fragmentPos, rectName);
fragBuilder->codeAppendf("\t\txSub += min(%s.z - %s.x, 0.0);\n", rectName, fragmentPos);
fragBuilder->codeAppendf("\t\tySub = min(%s.y - %s.y, 0.0);\n", fragmentPos, rectName);
fragBuilder->codeAppendf("\t\tySub += min(%s.w - %s.y, 0.0);\n", rectName, fragmentPos);
// Now compute coverage in x and y and multiply them to get the fraction of the pixel
// covered.
fragBuilder->codeAppendf("\t\tfloat alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0));\n");
} else {
fragBuilder->codeAppendf("\t\tfloat alpha = 1.0;\n");
fragBuilder->codeAppendf("\t\talpha *= (%s.x - %s.x) > -0.5 ? 1.0 : 0.0;\n", fragmentPos, rectName);
fragBuilder->codeAppendf("\t\talpha *= (%s.z - %s.x) > -0.5 ? 1.0 : 0.0;\n", rectName, fragmentPos);
fragBuilder->codeAppendf("\t\talpha *= (%s.y - %s.y) > -0.5 ? 1.0 : 0.0;\n", fragmentPos, rectName);
fragBuilder->codeAppendf("\t\talpha *= (%s.w - %s.y) > -0.5 ? 1.0 : 0.0;\n", rectName, fragmentPos);
}
if (GrProcessorEdgeTypeIsInverseFill(aare.getEdgeType())) {
fragBuilder->codeAppend("\t\talpha = 1.0 - alpha;\n");
}
fragBuilder->codeAppendf("\t\t%s = %s;\n", args.fOutputColor,
(GrGLSLExpr4(args.fInputColor) * GrGLSLExpr1("alpha")).c_str());
}
void GrGLAlphaThresholdFragmentProcessor::emitCode(EmitArgs& args) {
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fInnerThresholdVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"inner_threshold");
fOuterThresholdVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"outer_threshold");
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
SkString maskCoords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 1);
fragBuilder->codeAppendf("vec2 coord = %s;", coords2D.c_str());
fragBuilder->codeAppendf("vec2 mask_coord = %s;", maskCoords2D.c_str());
fragBuilder->codeAppend("vec4 input_color = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
fragBuilder->codeAppend(";");
fragBuilder->codeAppend("vec4 mask_color = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[1], "mask_coord");
fragBuilder->codeAppend(";");
fragBuilder->codeAppendf("float inner_thresh = %s;",
uniformHandler->getUniformCStr(fInnerThresholdVar));
fragBuilder->codeAppendf("float outer_thresh = %s;",
uniformHandler->getUniformCStr(fOuterThresholdVar));
fragBuilder->codeAppend("float mask = mask_color.a;");
fragBuilder->codeAppend("vec4 color = input_color;");
fragBuilder->codeAppend("if (mask < 0.5) {"
"if (color.a > outer_thresh) {"
"float scale = outer_thresh / color.a;"
"color.rgb *= scale;"
"color.a = outer_thresh;"
"}"
"} else if (color.a < inner_thresh) {"
"float scale = inner_thresh / max(0.001, color.a);"
"color.rgb *= scale;"
"color.a = inner_thresh;"
"}");
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor,
(GrGLSLExpr4(args.fInputColor) * GrGLSLExpr4("color")).c_str());
}
void GrGLCircleBlurFragmentProcessor::emitCode(EmitArgs& args) {
const char *dataName;
// The data is formatted as:
// x,y - the center of the circle
// z - the distance at which the intensity starts falling off (e.g., the start of the table)
// w - the inverse of the profile texture size
fDataUniform = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kVec4f_GrSLType,
kDefault_GrSLPrecision,
"data",
&dataName);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
const char *fragmentPos = fragBuilder->fragmentPosition();
if (args.fInputColor) {
fragBuilder->codeAppendf("vec4 src=%s;", args.fInputColor);
} else {
fragBuilder->codeAppendf("vec4 src=vec4(1);");
}
// We just want to compute "length(vec) - %s.z + 0.5) * %s.w" but need to rearrange
// for precision
fragBuilder->codeAppendf("vec2 vec = vec2( (%s.x - %s.x) * %s.w , (%s.y - %s.y) * %s.w );",
fragmentPos, dataName, dataName,
fragmentPos, dataName, dataName);
fragBuilder->codeAppendf("float dist = length(vec) + ( 0.5 - %s.z ) * %s.w;",
dataName, dataName);
fragBuilder->codeAppendf("float intensity = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "vec2(dist, 0.5)");
fragBuilder->codeAppend(".a;");
fragBuilder->codeAppendf("%s = src * intensity;\n", args.fOutputColor );
}
void GrGLMagnifierEffect::emitCode(EmitArgs& args) {
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fOffsetVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"Offset");
fInvZoomVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"InvZoom");
fInvInsetVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"InvInset");
fBoundsVar = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec4f_GrSLType, kDefault_GrSLPrecision,
"Bounds");
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
fragBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
fragBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n",
uniformHandler->getUniformCStr(fOffsetVar),
coords2D.c_str(),
uniformHandler->getUniformCStr(fInvZoomVar));
const char* bounds = uniformHandler->getUniformCStr(fBoundsVar);
fragBuilder->codeAppendf("\t\tvec2 delta = (coord - %s.xy) * %s.zw;\n", bounds, bounds);
fragBuilder->codeAppendf("\t\tdelta = min(delta, vec2(1.0, 1.0) - delta);\n");
fragBuilder->codeAppendf("\t\tdelta = delta * %s;\n",
uniformHandler->getUniformCStr(fInvInsetVar));
fragBuilder->codeAppend("\t\tfloat weight = 0.0;\n");
fragBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n");
fragBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n");
fragBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n");
fragBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
fragBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
fragBuilder->codeAppend("\t\t} else {\n");
fragBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
fragBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
fragBuilder->codeAppend("\t\t}\n");
fragBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
fragBuilder->codeAppend("\t\tvec4 output_color = ");
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "mix_coord");
fragBuilder->codeAppend(";\n");
fragBuilder->codeAppendf("\t\t%s = output_color;", args.fOutputColor);
SkString modulate;
GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
fragBuilder->codeAppend(modulate.c_str());
}
void GrGLMatrixConvolutionEffect::emitCode(EmitArgs& args) {
const GrMatrixConvolutionEffect& mce = args.fFp.cast<GrMatrixConvolutionEffect>();
const GrTextureDomain& domain = mce.domain();
int kWidth = mce.kernelSize().width();
int kHeight = mce.kernelSize().height();
int arrayCount = (kWidth * kHeight + 3) / 4;
SkASSERT(4 * arrayCount >= kWidth * kHeight);
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
"ImageIncrement");
fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag, kHalf4_GrSLType,
"Kernel",
arrayCount);
fKernelOffsetUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
"KernelOffset");
fGainUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType, "Gain");
fBiasUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType, "Bias");
const char* kernelOffset = uniformHandler->getUniformCStr(fKernelOffsetUni);
const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
const char* kernel = uniformHandler->getUniformCStr(fKernelUni);
const char* gain = uniformHandler->getUniformCStr(fGainUni);
const char* bias = uniformHandler->getUniformCStr(fBiasUni);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
fragBuilder->codeAppend("half4 sum = half4(0, 0, 0, 0);");
fragBuilder->codeAppendf("float2 coord = %s - %s * %s;", coords2D.c_str(), kernelOffset, imgInc);
fragBuilder->codeAppend("half4 c;");
const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
for (int y = 0; y < kHeight; y++) {
for (int x = 0; x < kWidth; x++) {
GrGLSLShaderBuilder::ShaderBlock block(fragBuilder);
int offset = y*kWidth + x;
fragBuilder->codeAppendf("half k = %s[%d]%s;", kernel, offset / 4,
kVecSuffix[offset & 0x3]);
SkString coord;
coord.printf("coord + half2(%d, %d) * %s", x, y, imgInc);
fDomain.sampleTexture(fragBuilder,
uniformHandler,
args.fShaderCaps,
domain,
"c",
coord,
args.fTexSamplers[0]);
if (!mce.convolveAlpha()) {
fragBuilder->codeAppend("c.rgb /= c.a;");
fragBuilder->codeAppend("c.rgb = clamp(c.rgb, 0.0, 1.0);");
}
fragBuilder->codeAppend("sum += c * k;");
}
}
if (mce.convolveAlpha()) {
fragBuilder->codeAppendf("%s = sum * %s + %s;", args.fOutputColor, gain, bias);
fragBuilder->codeAppendf("%s.a = clamp(%s.a, 0, 1);", args.fOutputColor, args.fOutputColor);
fragBuilder->codeAppendf("%s.rgb = clamp(%s.rgb, 0.0, %s.a);",
args.fOutputColor, args.fOutputColor, args.fOutputColor);
} else {
fDomain.sampleTexture(fragBuilder,
uniformHandler,
args.fShaderCaps,
domain,
"c",
coords2D,
args.fTexSamplers[0]);
fragBuilder->codeAppendf("%s.a = c.a;", args.fOutputColor);
fragBuilder->codeAppendf("%s.rgb = clamp(sum.rgb * %s + %s, 0, 1);", args.fOutputColor, gain, bias);
fragBuilder->codeAppendf("%s.rgb *= %s.a;", args.fOutputColor, args.fOutputColor);
}
fragBuilder->codeAppendf("%s *= %s;\n", args.fOutputColor, args.fInputColor);
}
void emitCode(EmitArgs& args) override {
const TwoPointConicalEffect& effect = args.fFp.cast<TwoPointConicalEffect>();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
this->emitUniforms(uniformHandler, effect);
fParamUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
"Conical2FSParams");
SkString p0; // 1 / r1
SkString p1; // f = focalX = r0 / (r0 - r1)
p0.appendf("%s.x", uniformHandler->getUniformVariable(fParamUni).getName().c_str());
p1.appendf("%s.y", uniformHandler->getUniformVariable(fParamUni).getName().c_str());
const char* tName = "t"; // the gradient
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
const char* p = coords2D.c_str();
if (effect.isFocalOnCircle()) {
fragBuilder->codeAppendf("half x_t = dot(%s, %s) / %s.x;", p, p, p);
} else if (effect.isWellBehaved()) {
fragBuilder->codeAppendf("half x_t = length(%s) - %s.x * %s;", p, p, p0.c_str());
} else {
char sign = (effect.isSwapped() || !effect.isRadiusIncreasing()) ? '-' : ' ';
fragBuilder->codeAppendf("half temp = %s.x * %s.x - %s.y * %s.y;", p, p, p, p);
// Initialize x_t to illegal state
fragBuilder->codeAppendf("half x_t = -1;");
// Only do sqrt if temp >= 0; this is significantly slower than checking temp >= 0 in
// the if statement that checks r(t) >= 0. But GPU may break if we sqrt a negative
// float. (Although I havevn't observed that on any devices so far, and the old approach
// also does sqrt negative value without a check.) If the performance is really
// critical, maybe we should just compute the area where temp and x_t are always
// valid and drop all these ifs.
fragBuilder->codeAppendf("if (temp >= 0) {");
fragBuilder->codeAppendf("x_t = (%csqrt(temp) - %s.x * %s);", sign, p, p0.c_str());
fragBuilder->codeAppendf("}");
}
// empty sign is positive
char sign = effect.isRadiusIncreasing() ? ' ' : '-';
// "+ 0" is much faster than "+ p1" so we specialize the natively focal case where p1 = 0.
fragBuilder->codeAppendf("half %s = %cx_t + %s;", tName, sign,
effect.isNativelyFocal() ? "0" : p1.c_str());
if (!effect.isWellBehaved()) {
// output will default to transparent black (we simply won't write anything
// else to it if invalid, instead of discarding or returning prematurely)
fragBuilder->codeAppendf("%s = half4(0.0,0.0,0.0,0.0);", args.fOutputColor);
fragBuilder->codeAppendf("if (x_t > 0.0) {");
}
if (effect.isSwapped()) {
fragBuilder->codeAppendf("%s = 1 - %s;", tName, tName);
}
this->emitColor(fragBuilder,
uniformHandler,
args.fShaderCaps,
effect,
tName,
args.fOutputColor,
args.fInputColor,
args.fTexSamplers);
if (!effect.isWellBehaved()) {
fragBuilder->codeAppend("};");
}
}
void emitCode(EmitArgs& args) override {
const GrConfigConversionEffect& cce = args.fFp.cast<GrConfigConversionEffect>();
const GrSwizzle& swizzle = cce.swizzle();
GrConfigConversionEffect::PMConversion pmConversion = cce.pmConversion();
// Using highp for GLES here in order to avoid some precision issues on specific GPUs.
GrGLSLShaderVar tmpVar("tmpColor", kVec4f_GrSLType, 0, kHigh_GrSLPrecision);
SkString tmpDecl;
tmpVar.appendDecl(args.fGLSLCaps, &tmpDecl);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("%s;", tmpDecl.c_str());
fragBuilder->codeAppendf("%s = ", tmpVar.c_str());
fragBuilder->appendTextureLookup(args.fTexSamplers[0], args.fCoords[0].c_str(),
args.fCoords[0].getType());
fragBuilder->codeAppend(";");
if (GrConfigConversionEffect::kNone_PMConversion == pmConversion) {
SkASSERT(GrSwizzle::RGBA() != swizzle);
fragBuilder->codeAppendf("%s = %s.%s;", args.fOutputColor, tmpVar.c_str(),
swizzle.c_str());
} else {
switch (pmConversion) {
case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion:
fragBuilder->codeAppendf(
"%s = vec4(ceil(%s.rgb * %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion:
// Add a compensation(0.001) here to avoid the side effect of the floor operation.
// In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0
// is less than the integer value converted from %s.r by 1 when the %s.r is
// converted from the integer value 2^n, such as 1, 2, 4, 8, etc.
fragBuilder->codeAppendf(
"%s = vec4(floor(%s.rgb * %s.a * 255.0 + 0.001) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str());
break;
case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion:
fragBuilder->codeAppendf(
"%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(ceil(%s.rgb / %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(),
tmpVar.c_str());
break;
case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion:
fragBuilder->codeAppendf(
"%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(floor(%s.rgb / %s.a * 255.0) / 255.0, %s.a);",
tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(), tmpVar.c_str(),
tmpVar.c_str());
break;
default:
SkFAIL("Unknown conversion op.");
break;
}
fragBuilder->codeAppendf("%s = %s.%s;", args.fOutputColor, tmpVar.c_str(),
swizzle.c_str());
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
fragBuilder->codeAppend(modulate.c_str());
}
void GLCircularRRectEffect::emitCode(EmitArgs& args) {
const CircularRRectEffect& crre = args.fFp.cast<CircularRRectEffect>();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
const char *rectName;
const char *radiusPlusHalfName;
// The inner rect is the rrect bounds inset by the radius. Its left, top, right, and bottom
// edges correspond to components x, y, z, and w, respectively. When a side of the rrect has
// only rectangular corners, that side's value corresponds to the rect edge's value outset by
// half a pixel.
fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf4_GrSLType,
"innerRect", &rectName);
// x is (r + .5) and y is 1/(r + .5)
fRadiusPlusHalfUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType,
"radiusPlusHalf", &radiusPlusHalfName);
// If we're on a device where float != fp32 then the length calculation could overflow.
SkString clampedCircleDistance;
if (!args.fShaderCaps->floatIs32Bits()) {
clampedCircleDistance.printf("clamp(%s.x * (1.0 - length(dxy * %s.y)), 0.0, 1.0);",
radiusPlusHalfName, radiusPlusHalfName);
} else {
clampedCircleDistance.printf("clamp(%s.x - length(dxy), 0.0, 1.0);", radiusPlusHalfName);
}
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// At each quarter-circle corner we compute a vector that is the offset of the fragment position
// from the circle center. The vector is pinned in x and y to be in the quarter-plane relevant
// to that corner. This means that points near the interior near the rrect top edge will have
// a vector that points straight up for both the TL left and TR corners. Computing an
// alpha from this vector at either the TR or TL corner will give the correct result. Similarly,
// fragments near the other three edges will get the correct AA. Fragments in the interior of
// the rrect will have a (0,0) vector at all four corners. So long as the radius > 0.5 they will
// correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas.
// The code below is a simplified version of the above that performs maxs on the vector
// components before computing distances and alpha values so that only one distance computation
// need be computed to determine the min alpha.
//
// For the cases where one half of the rrect is rectangular we drop one of the x or y
// computations, compute a separate rect edge alpha for the rect side, and mul the two computed
// alphas together.
switch (crre.getCircularCornerFlags()) {
case CircularRRectEffect::kAll_CornerFlags:
fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
fragBuilder->codeAppend("float2 dxy = max(max(dxy0, dxy1), 0.0);");
fragBuilder->codeAppendf("half alpha = %s;", clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kTopLeft_CornerFlag:
fragBuilder->codeAppendf("float2 dxy = max(%s.xy - sk_FragCoord.xy, 0.0);",
rectName);
fragBuilder->codeAppendf("half rightAlpha = clamp(%s.z - sk_FragCoord.x, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half bottomAlpha = clamp(%s.w - sk_FragCoord.y, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = bottomAlpha * rightAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kTopRight_CornerFlag:
fragBuilder->codeAppendf("float2 dxy = max(float2(sk_FragCoord.x - %s.z, "
"%s.y - sk_FragCoord.y), 0.0);",
rectName, rectName);
fragBuilder->codeAppendf("half leftAlpha = clamp(sk_FragCoord.x - %s.x, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half bottomAlpha = clamp(%s.w - sk_FragCoord.y, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = bottomAlpha * leftAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kBottomRight_CornerFlag:
fragBuilder->codeAppendf("float2 dxy = max(sk_FragCoord.xy - %s.zw, 0.0);",
rectName);
fragBuilder->codeAppendf("half leftAlpha = clamp(sk_FragCoord.x - %s.x, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half topAlpha = clamp(sk_FragCoord.y - %s.y, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = topAlpha * leftAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kBottomLeft_CornerFlag:
fragBuilder->codeAppendf("float2 dxy = max(float2(%s.x - sk_FragCoord.x, "
"sk_FragCoord.y - %s.w), 0.0);",
rectName, rectName);
fragBuilder->codeAppendf("half rightAlpha = clamp(%s.z - sk_FragCoord.x, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half topAlpha = clamp(sk_FragCoord.y - %s.y, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = topAlpha * rightAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kLeft_CornerFlags:
fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
fragBuilder->codeAppendf("float dy1 = sk_FragCoord.y - %s.w;", rectName);
fragBuilder->codeAppend("float2 dxy = max(float2(dxy0.x, max(dxy0.y, dy1)), 0.0);");
fragBuilder->codeAppendf("half rightAlpha = clamp(%s.z - sk_FragCoord.x, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = rightAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kTop_CornerFlags:
fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
fragBuilder->codeAppendf("float dx1 = sk_FragCoord.x - %s.z;", rectName);
fragBuilder->codeAppend("float2 dxy = max(float2(max(dxy0.x, dx1), dxy0.y), 0.0);");
fragBuilder->codeAppendf("half bottomAlpha = clamp(%s.w - sk_FragCoord.y, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = bottomAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kRight_CornerFlags:
fragBuilder->codeAppendf("float dy0 = %s.y - sk_FragCoord.y;", rectName);
fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
fragBuilder->codeAppend("float2 dxy = max(float2(dxy1.x, max(dy0, dxy1.y)), 0.0);");
fragBuilder->codeAppendf("half leftAlpha = clamp(sk_FragCoord.x - %s.x, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = leftAlpha * %s;",
clampedCircleDistance.c_str());
break;
case CircularRRectEffect::kBottom_CornerFlags:
fragBuilder->codeAppendf("float dx0 = %s.x - sk_FragCoord.x;", rectName);
fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
fragBuilder->codeAppend("float2 dxy = max(float2(max(dx0, dxy1.x), dxy1.y), 0.0);");
fragBuilder->codeAppendf("half topAlpha = clamp(sk_FragCoord.y - %s.y, 0.0, 1.0);",
rectName);
fragBuilder->codeAppendf("half alpha = topAlpha * %s;",
clampedCircleDistance.c_str());
break;
}
if (GrClipEdgeType::kInverseFillAA == crre.getEdgeType()) {
fragBuilder->codeAppend("alpha = 1.0 - alpha;");
}
fragBuilder->codeAppendf("%s = %s * alpha;", args.fOutputColor, args.fInputColor);
}
void GLEllipticalRRectEffect::emitCode(EmitArgs& args) {
const EllipticalRRectEffect& erre = args.fFp.cast<EllipticalRRectEffect>();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
const char *rectName;
// The inner rect is the rrect bounds inset by the x/y radii
fInnerRectUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf4_GrSLType,
"innerRect", &rectName);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// At each quarter-ellipse corner we compute a vector that is the offset of the fragment pos
// to the ellipse center. The vector is pinned in x and y to be in the quarter-plane relevant
// to that corner. This means that points near the interior near the rrect top edge will have
// a vector that points straight up for both the TL left and TR corners. Computing an
// alpha from this vector at either the TR or TL corner will give the correct result. Similarly,
// fragments near the other three edges will get the correct AA. Fragments in the interior of
// the rrect will have a (0,0) vector at all four corners. So long as the radii > 0.5 they will
// correctly produce an alpha value of 1 at all four corners. We take the min of all the alphas.
//
// The code below is a simplified version of the above that performs maxs on the vector
// components before computing distances and alpha values so that only one distance computation
// need be computed to determine the min alpha.
fragBuilder->codeAppendf("float2 dxy0 = %s.xy - sk_FragCoord.xy;", rectName);
fragBuilder->codeAppendf("float2 dxy1 = sk_FragCoord.xy - %s.zw;", rectName);
// If we're on a device where float != fp32 then we'll do the distance computation in a space
// that is normalized by the largest radius. The scale uniform will be scale, 1/scale. The
// radii uniform values are already in this normalized space.
const char* scaleName = nullptr;
if (!args.fShaderCaps->floatIs32Bits()) {
fScaleUniform = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf2_GrSLType, "scale",
&scaleName);
}
// The uniforms with the inv squared radii are highp to prevent underflow.
switch (erre.getRRect().getType()) {
case SkRRect::kSimple_Type: {
const char *invRadiiXYSqdName;
fInvRadiiSqdUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
kHalf2_GrSLType,
"invRadiiXY",
&invRadiiXYSqdName);
fragBuilder->codeAppend("float2 dxy = max(max(dxy0, dxy1), 0.0);");
if (scaleName) {
fragBuilder->codeAppendf("dxy *= %s.y;", scaleName);
}
// Z is the x/y offsets divided by squared radii.
fragBuilder->codeAppendf("float2 Z = dxy * %s.xy;", invRadiiXYSqdName);
break;
}
case SkRRect::kNinePatch_Type: {
const char *invRadiiLTRBSqdName;
fInvRadiiSqdUniform = uniformHandler->addUniform(kFragment_GrShaderFlag,
kHalf4_GrSLType,
"invRadiiLTRB",
&invRadiiLTRBSqdName);
if (scaleName) {
fragBuilder->codeAppendf("dxy0 *= %s.y;", scaleName);
fragBuilder->codeAppendf("dxy1 *= %s.y;", scaleName);
}
fragBuilder->codeAppend("float2 dxy = max(max(dxy0, dxy1), 0.0);");
// Z is the x/y offsets divided by squared radii. We only care about the (at most) one
// corner where both the x and y offsets are positive, hence the maxes. (The inverse
// squared radii will always be positive.)
fragBuilder->codeAppendf("float2 Z = max(max(dxy0 * %s.xy, dxy1 * %s.zw), 0.0);",
invRadiiLTRBSqdName, invRadiiLTRBSqdName);
break;
}
default:
SK_ABORT("RRect should always be simple or nine-patch.");
}
// implicit is the evaluation of (x/a)^2 + (y/b)^2 - 1.
fragBuilder->codeAppend("float implicit = dot(Z, dxy) - 1.0;");
// grad_dot is the squared length of the gradient of the implicit.
fragBuilder->codeAppend("float grad_dot = 4.0 * dot(Z, Z);");
// avoid calling inversesqrt on zero.
fragBuilder->codeAppend("grad_dot = max(grad_dot, 1.0e-4);");
fragBuilder->codeAppend("float approx_dist = implicit * inversesqrt(grad_dot);");
if (scaleName) {
fragBuilder->codeAppendf("approx_dist *= %s.x;", scaleName);
}
if (GrClipEdgeType::kFillAA == erre.getEdgeType()) {
fragBuilder->codeAppend("half alpha = clamp(0.5 - approx_dist, 0.0, 1.0);");
} else {
fragBuilder->codeAppend("half alpha = clamp(0.5 + approx_dist, 0.0, 1.0);");
}
fragBuilder->codeAppendf("%s = %s * alpha;", args.fOutputColor, args.fInputColor);
}
void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
const GrConvolutionEffect& ce = args.fFp.cast<GrConvolutionEffect>();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"ImageIncrement");
if (ce.useBounds()) {
fBoundsUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"Bounds");
}
int width = Gr1DKernelEffect::WidthFromRadius(ce.radius());
int arrayCount = (width + 3) / 4;
SkASSERT(4 * arrayCount >= width);
fKernelUni = uniformHandler->addUniformArray(kFragment_GrShaderFlag,
kVec4f_GrSLType, kDefault_GrSLPrecision,
"Kernel", arrayCount);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
fragBuilder->codeAppendf("%s = vec4(0, 0, 0, 0);", args.fOutputColor);
const GrGLSLShaderVar& kernel = uniformHandler->getUniformVariable(fKernelUni);
const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
fragBuilder->codeAppendf("vec2 coord = %s - %d.0 * %s;", coords2D.c_str(), ce.radius(), imgInc);
// Manually unroll loop because some drivers don't; yields 20-30% speedup.
const char* kVecSuffix[4] = { ".x", ".y", ".z", ".w" };
for (int i = 0; i < width; i++) {
SkString index;
SkString kernelIndex;
index.appendS32(i/4);
kernel.appendArrayAccess(index.c_str(), &kernelIndex);
kernelIndex.append(kVecSuffix[i & 0x3]);
if (ce.useBounds()) {
// We used to compute a bool indicating whether we're in bounds or not, cast it to a
// float, and then mul weight*texture_sample by the float. However, the Adreno 430 seems
// to have a bug that caused corruption.
const char* bounds = uniformHandler->getUniformCStr(fBoundsUni);
const char* component = ce.direction() == Gr1DKernelEffect::kY_Direction ? "y" : "x";
fragBuilder->codeAppendf("if (coord.%s >= %s.x && coord.%s <= %s.y) {",
component, bounds, component, bounds);
}
fragBuilder->codeAppendf("\t\t%s += ", args.fOutputColor);
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
fragBuilder->codeAppendf(" * %s;\n", kernelIndex.c_str());
if (ce.useBounds()) {
fragBuilder->codeAppend("}");
}
fragBuilder->codeAppendf("\t\tcoord += %s;\n", imgInc);
}
SkString modulate;
GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
fragBuilder->codeAppend(modulate.c_str());
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
const GrDistanceFieldLCDTextGeoProc& dfTexEffect =
args.fGP.cast<GrDistanceFieldLCDTextGeoProc>();
GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
// emit attributes
varyingHandler->emitAttributes(dfTexEffect);
const char* atlasSizeInvName;
fAtlasSizeInvUniform = uniformHandler->addUniform(kVertex_GrShaderFlag,
kFloat2_GrSLType,
kHigh_GrSLPrecision,
"AtlasSizeInv",
&atlasSizeInvName);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
// setup pass through color
varyingHandler->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
// Setup position
gpArgs->fPositionVar = dfTexEffect.inPosition()->asShaderVar();
// emit transforms
this->emitTransforms(vertBuilder,
varyingHandler,
uniformHandler,
dfTexEffect.inPosition()->asShaderVar(),
dfTexEffect.localMatrix(),
args.fFPCoordTransformHandler);
// set up varyings
GrGLSLVarying uv(kFloat2_GrSLType);
GrSLType texIdxType = args.fShaderCaps->integerSupport() ? kInt_GrSLType : kFloat_GrSLType;
GrGLSLVarying texIdx(texIdxType);
GrGLSLVarying st(kFloat2_GrSLType);
append_index_uv_varyings(args, dfTexEffect.inTextureCoords()->fName, atlasSizeInvName,
&uv, &texIdx, &st);
GrGLSLVarying delta(kFloat_GrSLType);
varyingHandler->addVarying("Delta", &delta);
if (dfTexEffect.getFlags() & kBGR_DistanceFieldEffectFlag) {
vertBuilder->codeAppendf("%s = -%s.x/3.0;", delta.vsOut(), atlasSizeInvName);
} else {
vertBuilder->codeAppendf("%s = %s.x/3.0;", delta.vsOut(), atlasSizeInvName);
}
// add frag shader code
bool isUniformScale = (dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) ==
kUniformScale_DistanceFieldEffectMask;
bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
bool isGammaCorrect =
SkToBool(dfTexEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag);
// create LCD offset adjusted by inverse of transform
// Use highp to work around aliasing issues
fragBuilder->codeAppendf("float2 uv = %s;\n", uv.fsIn());
if (isUniformScale) {
#ifdef SK_VULKAN
fragBuilder->codeAppendf("half st_grad_len = abs(dFdx(%s.x));", st.fsIn());
#else
// We use the y gradient because there is a bug in the Mali 400 in the x direction.
fragBuilder->codeAppendf("half st_grad_len = abs(dFdy(%s.y));", st.fsIn());
#endif
fragBuilder->codeAppendf("half2 offset = half2(st_grad_len*%s, 0.0);", delta.fsIn());
} else if (isSimilarity) {
// For a similarity matrix with rotation, the gradient will not be aligned
// with the texel coordinate axes, so we need to calculate it.
#ifdef SK_VULKAN
fragBuilder->codeAppendf("half2 st_grad = dFdx(%s);", st.fsIn());
fragBuilder->codeAppendf("half2 offset = %s*st_grad;", delta.fsIn());
#else
// We use dFdy because of a Mali 400 bug, and rotate -90 degrees to
// get the gradient in the x direction.
fragBuilder->codeAppendf("half2 st_grad = dFdy(%s);", st.fsIn());
fragBuilder->codeAppendf("half2 offset = %s*half2(st_grad.y, -st_grad.x);",
delta.fsIn());
#endif
fragBuilder->codeAppend("half st_grad_len = length(st_grad);");
} else {
fragBuilder->codeAppendf("half2 st = %s;\n", st.fsIn());
fragBuilder->codeAppend("half2 Jdx = dFdx(st);");
fragBuilder->codeAppend("half2 Jdy = dFdy(st);");
fragBuilder->codeAppendf("half2 offset = %s*Jdx;", delta.fsIn());
}
// sample the texture by index
fragBuilder->codeAppend("half4 texColor;");
append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(),
texIdx, "uv", "texColor");
// green is distance to uv center
fragBuilder->codeAppend("half3 distance;");
fragBuilder->codeAppend("distance.y = texColor.r;");
// red is distance to left offset
fragBuilder->codeAppend("half2 uv_adjusted = uv - offset;");
append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(),
texIdx, "uv_adjusted", "texColor");
fragBuilder->codeAppend("distance.x = texColor.r;");
// blue is distance to right offset
fragBuilder->codeAppend("uv_adjusted = uv + offset;");
append_multitexture_lookup(args, dfTexEffect.numTextureSamplers(),
texIdx, "uv_adjusted", "texColor");
fragBuilder->codeAppend("distance.z = texColor.r;");
fragBuilder->codeAppend("distance = "
"half3(" SK_DistanceFieldMultiplier ")*(distance - half3(" SK_DistanceFieldThreshold"));");
// adjust width based on gamma
const char* distanceAdjustUniName = nullptr;
fDistanceAdjustUni = uniformHandler->addUniform(kFragment_GrShaderFlag, kHalf3_GrSLType,
"DistanceAdjust", &distanceAdjustUniName);
fragBuilder->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.
fragBuilder->codeAppend("half afwidth;");
if (isSimilarity) {
// For similarity transform (uniform scale-only is a subset of this), 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
fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*st_grad_len;");
} 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.
fragBuilder->codeAppend("half2 dist_grad = half2(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
fragBuilder->codeAppend("half dg_len2 = dot(dist_grad, dist_grad);");
fragBuilder->codeAppend("if (dg_len2 < 0.0001) {");
fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);");
fragBuilder->codeAppend("} else {");
fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);");
fragBuilder->codeAppend("}");
fragBuilder->codeAppend("half2 grad = half2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
fragBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);");
// this gives us a smooth step across approximately one fragment
fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);");
}
// The smoothstep falloff compensates for the non-linear sRGB response curve. If we are
// doing gamma-correct rendering (to an sRGB or F16 buffer), then we actually want distance
// mapped linearly to coverage, so use a linear step:
if (isGammaCorrect) {
fragBuilder->codeAppendf("%s = "
"half4(clamp((distance + half3(afwidth)) / half3(2.0 * afwidth), 0.0, 1.0), 1.0);",
args.fOutputCoverage);
} else {
fragBuilder->codeAppendf(
"%s = half4(smoothstep(half3(-afwidth), half3(afwidth), distance), 1.0);",
args.fOutputCoverage);
}
}
void GrGLMorphologyEffect::emitCode(EmitArgs& args) {
const GrMorphologyEffect& me = args.fFp.cast<GrMorphologyEffect>();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fPixelSizeUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kFloat_GrSLType, kDefault_GrSLPrecision,
"PixelSize");
const char* pixelSizeInc = uniformHandler->getUniformCStr(fPixelSizeUni);
fRangeUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"Range");
const char* range = uniformHandler->getUniformCStr(fRangeUni);
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
const char* func;
switch (me.type()) {
case GrMorphologyEffect::kErode_MorphologyType:
fragBuilder->codeAppendf("\t\t%s = vec4(1, 1, 1, 1);\n", args.fOutputColor);
func = "min";
break;
case GrMorphologyEffect::kDilate_MorphologyType:
fragBuilder->codeAppendf("\t\t%s = vec4(0, 0, 0, 0);\n", args.fOutputColor);
func = "max";
break;
default:
SkFAIL("Unexpected type");
func = ""; // suppress warning
break;
}
const char* dir;
switch (me.direction()) {
case Gr1DKernelEffect::kX_Direction:
dir = "x";
break;
case Gr1DKernelEffect::kY_Direction:
dir = "y";
break;
default:
SkFAIL("Unknown filter direction.");
dir = ""; // suppress warning
}
int width = GrMorphologyEffect::WidthFromRadius(me.radius());
// vec2 coord = coord2D;
fragBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
// coord.x -= radius * pixelSize;
fragBuilder->codeAppendf("\t\tcoord.%s -= %d.0 * %s; \n", dir, me.radius(), pixelSizeInc);
if (me.useRange()) {
// highBound = min(highBound, coord.x + (width-1) * pixelSize);
fragBuilder->codeAppendf("\t\tfloat highBound = min(%s.y, coord.%s + %f * %s);",
range, dir, float(width - 1), pixelSizeInc);
// coord.x = max(lowBound, coord.x);
fragBuilder->codeAppendf("\t\tcoord.%s = max(%s.x, coord.%s);", dir, range, dir);
}
fragBuilder->codeAppendf("\t\tfor (int i = 0; i < %d; i++) {\n", width);
fragBuilder->codeAppendf("\t\t\t%s = %s(%s, ", args.fOutputColor, func, args.fOutputColor);
fragBuilder->appendTextureLookup(args.fTexSamplers[0], "coord");
fragBuilder->codeAppend(");\n");
// coord.x += pixelSize;
fragBuilder->codeAppendf("\t\t\tcoord.%s += %s;\n", dir, pixelSizeInc);
if (me.useRange()) {
// coord.x = min(highBound, coord.x);
fragBuilder->codeAppendf("\t\t\tcoord.%s = min(highBound, coord.%s);", dir, dir);
}
fragBuilder->codeAppend("\t\t}\n");
SkString modulate;
GrGLSLMulVarBy4f(&modulate, args.fOutputColor, args.fInputColor);
fragBuilder->codeAppend(modulate.c_str());
}
void GrGLPerlinNoise::emitCode(EmitArgs& args) {
const GrPerlinNoiseEffect& pne = args.fFp.cast<GrPerlinNoiseEffect>();
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
SkString vCoords = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
fBaseFrequencyUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"baseFrequency");
const char* baseFrequencyUni = uniformHandler->getUniformCStr(fBaseFrequencyUni);
const char* stitchDataUni = nullptr;
if (pne.stitchTiles()) {
fStitchDataUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"stitchData");
stitchDataUni = uniformHandler->getUniformCStr(fStitchDataUni);
}
// There are 4 lines, so the center of each line is 1/8, 3/8, 5/8 and 7/8
const char* chanCoordR = "0.125";
const char* chanCoordG = "0.375";
const char* chanCoordB = "0.625";
const char* chanCoordA = "0.875";
const char* chanCoord = "chanCoord";
const char* stitchData = "stitchData";
const char* ratio = "ratio";
const char* noiseVec = "noiseVec";
const char* noiseSmooth = "noiseSmooth";
const char* floorVal = "floorVal";
const char* fractVal = "fractVal";
const char* uv = "uv";
const char* ab = "ab";
const char* latticeIdx = "latticeIdx";
const char* bcoords = "bcoords";
const char* lattice = "lattice";
const char* inc8bit = "0.00390625"; // 1.0 / 256.0
// This is the math to convert the two 16bit integer packed into rgba 8 bit input into a
// [-1,1] vector and perform a dot product between that vector and the provided vector.
const char* dotLattice = "dot(((%s.ga + %s.rb * vec2(%s)) * vec2(2.0) - vec2(1.0)), %s);";
// Add noise function
static const GrGLSLShaderVar gPerlinNoiseArgs[] = {
GrGLSLShaderVar(chanCoord, kFloat_GrSLType),
GrGLSLShaderVar(noiseVec, kVec2f_GrSLType)
};
static const GrGLSLShaderVar gPerlinNoiseStitchArgs[] = {
GrGLSLShaderVar(chanCoord, kFloat_GrSLType),
GrGLSLShaderVar(noiseVec, kVec2f_GrSLType),
GrGLSLShaderVar(stitchData, kVec2f_GrSLType)
};
SkString noiseCode;
noiseCode.appendf("\tvec4 %s;\n", floorVal);
noiseCode.appendf("\t%s.xy = floor(%s);\n", floorVal, noiseVec);
noiseCode.appendf("\t%s.zw = %s.xy + vec2(1.0);\n", floorVal, floorVal);
noiseCode.appendf("\tvec2 %s = fract(%s);\n", fractVal, noiseVec);
// smooth curve : t * t * (3 - 2 * t)
noiseCode.appendf("\n\tvec2 %s = %s * %s * (vec2(3.0) - vec2(2.0) * %s);",
noiseSmooth, fractVal, fractVal, fractVal);
// Adjust frequencies if we're stitching tiles
if (pne.stitchTiles()) {
noiseCode.appendf("\n\tif(%s.x >= %s.x) { %s.x -= %s.x; }",
floorVal, stitchData, floorVal, stitchData);
noiseCode.appendf("\n\tif(%s.y >= %s.y) { %s.y -= %s.y; }",
floorVal, stitchData, floorVal, stitchData);
noiseCode.appendf("\n\tif(%s.z >= %s.x) { %s.z -= %s.x; }",
floorVal, stitchData, floorVal, stitchData);
noiseCode.appendf("\n\tif(%s.w >= %s.y) { %s.w -= %s.y; }",
floorVal, stitchData, floorVal, stitchData);
}
// Get texture coordinates and normalize
noiseCode.appendf("\n\t%s = fract(floor(mod(%s, 256.0)) / vec4(256.0));\n",
floorVal, floorVal);
// Get permutation for x
{
SkString xCoords("");
xCoords.appendf("vec2(%s.x, 0.5)", floorVal);
noiseCode.appendf("\n\tvec2 %s;\n\t%s.x = ", latticeIdx, latticeIdx);
fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[0], xCoords.c_str(),
kVec2f_GrSLType);
noiseCode.append(".r;");
}
// Get permutation for x + 1
{
SkString xCoords("");
xCoords.appendf("vec2(%s.z, 0.5)", floorVal);
noiseCode.appendf("\n\t%s.y = ", latticeIdx);
fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[0], xCoords.c_str(),
kVec2f_GrSLType);
noiseCode.append(".r;");
}
#if defined(SK_BUILD_FOR_ANDROID)
// Android rounding for Tegra devices, like, for example: Xoom (Tegra 2), Nexus 7 (Tegra 3).
// The issue is that colors aren't accurate enough on Tegra devices. For example, if an 8 bit
// value of 124 (or 0.486275 here) is entered, we can get a texture value of 123.513725
// (or 0.484368 here). The following rounding operation prevents these precision issues from
// affecting the result of the noise by making sure that we only have multiples of 1/255.
// (Note that 1/255 is about 0.003921569, which is the value used here).
noiseCode.appendf("\n\t%s = floor(%s * vec2(255.0) + vec2(0.5)) * vec2(0.003921569);",
latticeIdx, latticeIdx);
#endif
// Get (x,y) coordinates with the permutated x
noiseCode.appendf("\n\tvec4 %s = fract(%s.xyxy + %s.yyww);", bcoords, latticeIdx, floorVal);
noiseCode.appendf("\n\n\tvec2 %s;", uv);
// Compute u, at offset (0,0)
{
SkString latticeCoords("");
latticeCoords.appendf("vec2(%s.x, %s)", bcoords, chanCoord);
noiseCode.appendf("\n\tvec4 %s = ", lattice);
fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
kVec2f_GrSLType);
noiseCode.appendf(".bgra;\n\t%s.x = ", uv);
noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
}
noiseCode.appendf("\n\t%s.x -= 1.0;", fractVal);
// Compute v, at offset (-1,0)
{
SkString latticeCoords("");
latticeCoords.appendf("vec2(%s.y, %s)", bcoords, chanCoord);
noiseCode.append("\n\tlattice = ");
fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
kVec2f_GrSLType);
noiseCode.appendf(".bgra;\n\t%s.y = ", uv);
noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
}
// Compute 'a' as a linear interpolation of 'u' and 'v'
noiseCode.appendf("\n\tvec2 %s;", ab);
noiseCode.appendf("\n\t%s.x = mix(%s.x, %s.y, %s.x);", ab, uv, uv, noiseSmooth);
noiseCode.appendf("\n\t%s.y -= 1.0;", fractVal);
// Compute v, at offset (-1,-1)
{
SkString latticeCoords("");
latticeCoords.appendf("vec2(%s.w, %s)", bcoords, chanCoord);
noiseCode.append("\n\tlattice = ");
fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
kVec2f_GrSLType);
noiseCode.appendf(".bgra;\n\t%s.y = ", uv);
noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
}
noiseCode.appendf("\n\t%s.x += 1.0;", fractVal);
// Compute u, at offset (0,-1)
{
SkString latticeCoords("");
latticeCoords.appendf("vec2(%s.z, %s)", bcoords, chanCoord);
noiseCode.append("\n\tlattice = ");
fragBuilder->appendTextureLookup(&noiseCode, args.fTexSamplers[1], latticeCoords.c_str(),
kVec2f_GrSLType);
noiseCode.appendf(".bgra;\n\t%s.x = ", uv);
noiseCode.appendf(dotLattice, lattice, lattice, inc8bit, fractVal);
}
// Compute 'b' as a linear interpolation of 'u' and 'v'
noiseCode.appendf("\n\t%s.y = mix(%s.x, %s.y, %s.x);", ab, uv, uv, noiseSmooth);
// Compute the noise as a linear interpolation of 'a' and 'b'
noiseCode.appendf("\n\treturn mix(%s.x, %s.y, %s.y);\n", ab, ab, noiseSmooth);
SkString noiseFuncName;
if (pne.stitchTiles()) {
fragBuilder->emitFunction(kFloat_GrSLType,
"perlinnoise", SK_ARRAY_COUNT(gPerlinNoiseStitchArgs),
gPerlinNoiseStitchArgs, noiseCode.c_str(), &noiseFuncName);
} else {
fragBuilder->emitFunction(kFloat_GrSLType,
"perlinnoise", SK_ARRAY_COUNT(gPerlinNoiseArgs),
gPerlinNoiseArgs, noiseCode.c_str(), &noiseFuncName);
}
// There are rounding errors if the floor operation is not performed here
fragBuilder->codeAppendf("\n\t\tvec2 %s = floor(%s.xy) * %s;",
noiseVec, vCoords.c_str(), baseFrequencyUni);
// Clear the color accumulator
fragBuilder->codeAppendf("\n\t\t%s = vec4(0.0);", args.fOutputColor);
if (pne.stitchTiles()) {
// Set up TurbulenceInitial stitch values.
fragBuilder->codeAppendf("vec2 %s = %s;", stitchData, stitchDataUni);
}
fragBuilder->codeAppendf("float %s = 1.0;", ratio);
// Loop over all octaves
fragBuilder->codeAppendf("for (int octave = 0; octave < %d; ++octave) {", pne.numOctaves());
fragBuilder->codeAppendf("%s += ", args.fOutputColor);
if (pne.type() != SkPerlinNoiseShader::kFractalNoise_Type) {
fragBuilder->codeAppend("abs(");
}
if (pne.stitchTiles()) {
fragBuilder->codeAppendf(
"vec4(\n\t\t\t\t%s(%s, %s, %s),\n\t\t\t\t%s(%s, %s, %s),"
"\n\t\t\t\t%s(%s, %s, %s),\n\t\t\t\t%s(%s, %s, %s))",
noiseFuncName.c_str(), chanCoordR, noiseVec, stitchData,
noiseFuncName.c_str(), chanCoordG, noiseVec, stitchData,
noiseFuncName.c_str(), chanCoordB, noiseVec, stitchData,
noiseFuncName.c_str(), chanCoordA, noiseVec, stitchData);
} else {
fragBuilder->codeAppendf(
"vec4(\n\t\t\t\t%s(%s, %s),\n\t\t\t\t%s(%s, %s),"
"\n\t\t\t\t%s(%s, %s),\n\t\t\t\t%s(%s, %s))",
noiseFuncName.c_str(), chanCoordR, noiseVec,
noiseFuncName.c_str(), chanCoordG, noiseVec,
noiseFuncName.c_str(), chanCoordB, noiseVec,
noiseFuncName.c_str(), chanCoordA, noiseVec);
}
if (pne.type() != SkPerlinNoiseShader::kFractalNoise_Type) {
fragBuilder->codeAppendf(")"); // end of "abs("
}
fragBuilder->codeAppendf(" * %s;", ratio);
fragBuilder->codeAppendf("\n\t\t\t%s *= vec2(2.0);", noiseVec);
fragBuilder->codeAppendf("\n\t\t\t%s *= 0.5;", ratio);
if (pne.stitchTiles()) {
fragBuilder->codeAppendf("\n\t\t\t%s *= vec2(2.0);", stitchData);
}
fragBuilder->codeAppend("\n\t\t}"); // end of the for loop on octaves
if (pne.type() == SkPerlinNoiseShader::kFractalNoise_Type) {
// The value of turbulenceFunctionResult comes from ((turbulenceFunctionResult) + 1) / 2
// by fractalNoise and (turbulenceFunctionResult) by turbulence.
fragBuilder->codeAppendf("\n\t\t%s = %s * vec4(0.5) + vec4(0.5);",
args.fOutputColor,args.fOutputColor);
}
// Clamp values
fragBuilder->codeAppendf("\n\t\t%s = clamp(%s, 0.0, 1.0);", args.fOutputColor, args.fOutputColor);
// Pre-multiply the result
fragBuilder->codeAppendf("\n\t\t%s = vec4(%s.rgb * %s.aaa, %s.a);\n",
args.fOutputColor, args.fOutputColor,
args.fOutputColor, args.fOutputColor);
}
void GrGLBicubicEffect::emitCode(EmitArgs& args) {
const GrBicubicEffect& bicubicEffect = args.fFp.cast<GrBicubicEffect>();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"ImageIncrement");
const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
fColorSpaceHelper.emitCode(uniformHandler, bicubicEffect.colorSpaceXform());
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
/*
* Filter weights come from Don Mitchell & Arun Netravali's 'Reconstruction Filters in Computer
* Graphics', ACM SIGGRAPH Computer Graphics 22, 4 (Aug. 1988).
* ACM DL: http://dl.acm.org/citation.cfm?id=378514
* Free : http://www.cs.utexas.edu/users/fussell/courses/cs384g/lectures/mitchell/Mitchell.pdf
*
* The authors define a family of cubic filters with two free parameters (B and C):
*
* { (12 - 9B - 6C)|x|^3 + (-18 + 12B + 6C)|x|^2 + (6 - 2B) if |x| < 1
* k(x) = 1/6 { (-B - 6C)|x|^3 + (6B + 30C)|x|^2 + (-12B - 48C)|x| + (8B + 24C) if 1 <= |x| < 2
* { 0 otherwise
*
* Various well-known cubic splines can be generated, and the authors select (1/3, 1/3) as their
* favorite overall spline - this is now commonly known as the Mitchell filter, and is the
* source of the specific weights below.
*
* This is GLSL, so the matrix is column-major (transposed from standard matrix notation).
*/
fragBuilder->codeAppend("mat4 kMitchellCoefficients = mat4("
" 1.0 / 18.0, 16.0 / 18.0, 1.0 / 18.0, 0.0 / 18.0,"
"-9.0 / 18.0, 0.0 / 18.0, 9.0 / 18.0, 0.0 / 18.0,"
"15.0 / 18.0, -36.0 / 18.0, 27.0 / 18.0, -6.0 / 18.0,"
"-7.0 / 18.0, 21.0 / 18.0, -21.0 / 18.0, 7.0 / 18.0);");
fragBuilder->codeAppendf("vec2 coord = %s - %s * vec2(0.5);", coords2D.c_str(), imgInc);
// We unnormalize the coord in order to determine our fractional offset (f) within the texel
// We then snap coord to a texel center and renormalize. The snap prevents cases where the
// starting coords are near a texel boundary and accumulations of imgInc would cause us to skip/
// double hit a texel.
fragBuilder->codeAppendf("coord /= %s;", imgInc);
fragBuilder->codeAppend("vec2 f = fract(coord);");
fragBuilder->codeAppendf("coord = (coord - f + vec2(0.5)) * %s;", imgInc);
fragBuilder->codeAppend("vec4 wx = kMitchellCoefficients * vec4(1.0, f.x, f.x * f.x, f.x * f.x * f.x);");
fragBuilder->codeAppend("vec4 wy = kMitchellCoefficients * vec4(1.0, f.y, f.y * f.y, f.y * f.y * f.y);");
fragBuilder->codeAppend("vec4 rowColors[4];");
for (int y = 0; y < 4; ++y) {
for (int x = 0; x < 4; ++x) {
SkString coord;
coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1);
SkString sampleVar;
sampleVar.printf("rowColors[%d]", x);
fDomain.sampleTexture(fragBuilder,
args.fUniformHandler,
args.fShaderCaps,
bicubicEffect.domain(),
sampleVar.c_str(),
coord,
args.fTexSamplers[0]);
}
fragBuilder->codeAppendf(
"vec4 s%d = wx.x * rowColors[0] + wx.y * rowColors[1] + wx.z * rowColors[2] + wx.w * rowColors[3];",
y);
}
SkString bicubicColor("(wy.x * s0 + wy.y * s1 + wy.z * s2 + wy.w * s3)");
if (fColorSpaceHelper.isValid()) {
SkString xformedColor;
fragBuilder->appendColorGamutXform(&xformedColor, bicubicColor.c_str(), &fColorSpaceHelper);
bicubicColor.swap(xformedColor);
}
fragBuilder->codeAppendf("%s = %s * %s;", args.fOutputColor, bicubicColor.c_str(),
args.fInputColor);
}
void GrGLDisplacementMapEffect::emitCode(EmitArgs& args) {
const GrDisplacementMapEffect& displacementMap = args.fFp.cast<GrDisplacementMapEffect>();
const GrTextureDomain& domain = displacementMap.domain();
fScaleUni = args.fUniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision, "Scale");
const char* scaleUni = args.fUniformHandler->getUniformCStr(fScaleUni);
const char* dColor = "dColor";
const char* cCoords = "cCoords";
const char* nearZero = "1e-6"; // Since 6.10352e−5 is the smallest half float, use
// a number smaller than that to approximate 0, but
// leave room for 32-bit float GPU rounding errors.
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->codeAppendf("\t\tvec4 %s = ", dColor);
fragBuilder->appendTextureLookup(args.fTexSamplers[0], args.fCoords[0].c_str(),
args.fCoords[0].getType());
fragBuilder->codeAppend(";\n");
// Unpremultiply the displacement
fragBuilder->codeAppendf(
"\t\t%s.rgb = (%s.a < %s) ? vec3(0.0) : clamp(%s.rgb / %s.a, 0.0, 1.0);",
dColor, dColor, nearZero, dColor, dColor);
SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 1);
fragBuilder->codeAppendf("\t\tvec2 %s = %s + %s*(%s.",
cCoords, coords2D.c_str(), scaleUni, dColor);
switch (displacementMap.xChannelSelector()) {
case SkDisplacementMapEffect::kR_ChannelSelectorType:
fragBuilder->codeAppend("r");
break;
case SkDisplacementMapEffect::kG_ChannelSelectorType:
fragBuilder->codeAppend("g");
break;
case SkDisplacementMapEffect::kB_ChannelSelectorType:
fragBuilder->codeAppend("b");
break;
case SkDisplacementMapEffect::kA_ChannelSelectorType:
fragBuilder->codeAppend("a");
break;
case SkDisplacementMapEffect::kUnknown_ChannelSelectorType:
default:
SkDEBUGFAIL("Unknown X channel selector");
}
switch (displacementMap.yChannelSelector()) {
case SkDisplacementMapEffect::kR_ChannelSelectorType:
fragBuilder->codeAppend("r");
break;
case SkDisplacementMapEffect::kG_ChannelSelectorType:
fragBuilder->codeAppend("g");
break;
case SkDisplacementMapEffect::kB_ChannelSelectorType:
fragBuilder->codeAppend("b");
break;
case SkDisplacementMapEffect::kA_ChannelSelectorType:
fragBuilder->codeAppend("a");
break;
case SkDisplacementMapEffect::kUnknown_ChannelSelectorType:
default:
SkDEBUGFAIL("Unknown Y channel selector");
}
fragBuilder->codeAppend("-vec2(0.5));\t\t");
fGLDomain.sampleTexture(fragBuilder,
args.fUniformHandler,
args.fGLSLCaps,
domain,
args.fOutputColor,
SkString(cCoords),
args.fTexSamplers[1]);
fragBuilder->codeAppend(";\n");
}
void GrGLBicubicEffect::emitCode(EmitArgs& args) {
const GrTextureDomain& domain = args.fFp.cast<GrBicubicEffect>().domain();
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fCoefficientsUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kMat44f_GrSLType, kDefault_GrSLPrecision,
"Coefficients");
fImageIncrementUni = uniformHandler->addUniform(kFragment_GrShaderFlag,
kVec2f_GrSLType, kDefault_GrSLPrecision,
"ImageIncrement");
const char* imgInc = uniformHandler->getUniformCStr(fImageIncrementUni);
const char* coeff = uniformHandler->getUniformCStr(fCoefficientsUni);
SkString cubicBlendName;
static const GrGLSLShaderVar gCubicBlendArgs[] = {
GrGLSLShaderVar("coefficients", kMat44f_GrSLType),
GrGLSLShaderVar("t", kFloat_GrSLType),
GrGLSLShaderVar("c0", kVec4f_GrSLType),
GrGLSLShaderVar("c1", kVec4f_GrSLType),
GrGLSLShaderVar("c2", kVec4f_GrSLType),
GrGLSLShaderVar("c3", kVec4f_GrSLType),
};
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 0);
fragBuilder->emitFunction(kVec4f_GrSLType,
"cubicBlend",
SK_ARRAY_COUNT(gCubicBlendArgs),
gCubicBlendArgs,
"\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n"
"\tvec4 c = coefficients * ts;\n"
"\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n",
&cubicBlendName);
fragBuilder->codeAppendf("\tvec2 coord = %s - %s * vec2(0.5);\n", coords2D.c_str(), imgInc);
// We unnormalize the coord in order to determine our fractional offset (f) within the texel
// We then snap coord to a texel center and renormalize. The snap prevents cases where the
// starting coords are near a texel boundary and accumulations of imgInc would cause us to skip/
// double hit a texel.
fragBuilder->codeAppendf("\tcoord /= %s;\n", imgInc);
fragBuilder->codeAppend("\tvec2 f = fract(coord);\n");
fragBuilder->codeAppendf("\tcoord = (coord - f + vec2(0.5)) * %s;\n", imgInc);
fragBuilder->codeAppend("\tvec4 rowColors[4];\n");
for (int y = 0; y < 4; ++y) {
for (int x = 0; x < 4; ++x) {
SkString coord;
coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1);
SkString sampleVar;
sampleVar.printf("rowColors[%d]", x);
fDomain.sampleTexture(fragBuilder,
args.fUniformHandler,
args.fGLSLCaps,
domain,
sampleVar.c_str(),
coord,
args.fTexSamplers[0]);
}
fragBuilder->codeAppendf(
"\tvec4 s%d = %s(%s, f.x, rowColors[0], rowColors[1], rowColors[2], rowColors[3]);\n",
y, cubicBlendName.c_str(), coeff);
}
SkString bicubicColor;
bicubicColor.printf("%s(%s, f.y, s0, s1, s2, s3)", cubicBlendName.c_str(), coeff);
fragBuilder->codeAppendf("\t%s = %s;\n",
args.fOutputColor, (GrGLSLExpr4(bicubicColor.c_str()) *
GrGLSLExpr4(args.fInputColor)).c_str());
}
void GrGLSLFragmentProcessor::internalEmitChild(int childIndex, const char* inputColor,
const char* outputColor, EmitArgs& args) {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
fragBuilder->onBeforeChildProcEmitCode(); // call first so mangleString is updated
const GrFragmentProcessor& childProc = args.fFp.childProcessor(childIndex);
/*
* We now want to find the subset of coords and samplers that belong to the child and its
* descendants and put that into childCoords and childSamplers. To do so, we'll do a forwards
* linear search.
*
* Explanation:
* Each GrFragmentProcessor has a copy of all the transforms and textures of itself and
* all procs in its subtree. For example, suppose we have frag proc A, who has two children B
* and D. B has a child C, and D has two children E and F. Each frag proc's transforms array
* contains its own transforms, followed by the transforms of all its descendants (i.e. preorder
* traversal). Suppose procs A, B, C, D, E, F have 1, 2, 1, 1, 3, 2 transforms respectively.
*
* (A)
* [a1,b1,b2,c1,d1,e1,e2,e3,f1,f2]
* / \
* / \
* (B) (D)
* [b1,b2,c1] [d1,e1,e2,e3,f1,f2]
* / / \
* / / \
* (C) (E) (F)
* [c1] [e1,e2,e3] [f1,f2]
*
* So if we're inside proc A's emitCode, and A is about to call emitCode on proc D, we want the
* EmitArgs that's passed onto D to only contain its and its descendants' coords. The
* EmitArgs given to A would contain the transforms [a1,b1,b2,c1,d1,e1,e2,e3,f1,f2], and we want
* to extract the subset [d1,e1,e2,e3,f1,f2] to pass on to D. We can do this with a linear
* search since we know that A has 1 transform (using A.numTransformsExclChildren()), and B's
* subtree has 3 transforms (using B.numTransforms()), so we know the start of D's transforms is
* 4 after the start of A's transforms.
* Textures work the same way as transforms.
*/
int firstCoordAt = args.fFp.numTransformsExclChildren();
int firstSamplerAt = args.fFp.numTexturesExclChildren();
for (int i = 0; i < childIndex; ++i) {
firstCoordAt += args.fFp.childProcessor(i).numTransforms();
firstSamplerAt += args.fFp.childProcessor(i).numTextures();
}
GrGLSLTransformedCoordsArray childCoords;
TextureSamplerArray childSamplers;
if (childProc.numTransforms() > 0) {
childCoords.push_back_n(childProc.numTransforms(), &args.fCoords[firstCoordAt]);
}
if (childProc.numTextures() > 0) {
childSamplers.push_back_n(childProc.numTextures(), &args.fSamplers[firstSamplerAt]);
}
// emit the code for the child in its own scope
fragBuilder->codeAppend("{\n");
fragBuilder->codeAppendf("// Child Index %d (mangle: %s): %s\n", childIndex,
fragBuilder->getMangleString().c_str(), childProc.name());
EmitArgs childArgs(fragBuilder,
args.fUniformHandler,
args.fGLSLCaps,
childProc,
outputColor,
inputColor,
childCoords,
childSamplers);
this->childProcessor(childIndex)->emitCode(childArgs);
fragBuilder->codeAppend("}\n");
fragBuilder->onAfterChildProcEmitCode();
}
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
const GrDistanceFieldPathGeoProc& dfPathEffect =
args.fGP.cast<GrDistanceFieldPathGeoProc>();
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
// emit attributes
varyingHandler->emitAttributes(dfPathEffect);
const char* atlasSizeInvName;
fAtlasSizeInvUniform = uniformHandler->addUniform(kVertex_GrShaderFlag,
kFloat2_GrSLType,
kHigh_GrSLPrecision,
"AtlasSizeInv",
&atlasSizeInvName);
GrGLSLVarying uv(kFloat2_GrSLType);
GrSLType texIdxType = args.fShaderCaps->integerSupport() ? kInt_GrSLType : kFloat_GrSLType;
GrGLSLVarying texIdx(texIdxType);
GrGLSLVarying st(kFloat2_GrSLType);
append_index_uv_varyings(args, dfPathEffect.inTextureCoords()->fName, atlasSizeInvName, &uv,
&texIdx, &st);
// setup pass through color
varyingHandler->addPassThroughAttribute(dfPathEffect.inColor(), args.fOutputColor);
if (dfPathEffect.matrix().hasPerspective()) {
// Setup position
this->writeOutputPosition(vertBuilder,
uniformHandler,
gpArgs,
dfPathEffect.inPosition()->fName,
dfPathEffect.matrix(),
&fMatrixUniform);
// emit transforms
this->emitTransforms(vertBuilder,
varyingHandler,
uniformHandler,
dfPathEffect.inPosition()->asShaderVar(),
args.fFPCoordTransformHandler);
} else {
// Setup position
this->writeOutputPosition(vertBuilder, gpArgs, dfPathEffect.inPosition()->fName);
// emit transforms
this->emitTransforms(vertBuilder,
varyingHandler,
uniformHandler,
dfPathEffect.inPosition()->asShaderVar(),
dfPathEffect.matrix(),
args.fFPCoordTransformHandler);
}
// Use highp to work around aliasing issues
fragBuilder->codeAppendf("float2 uv = %s;", uv.fsIn());
fragBuilder->codeAppend("half4 texColor;");
append_multitexture_lookup(args, dfPathEffect.numTextureSamplers(), texIdx, "uv",
"texColor");
fragBuilder->codeAppend("half distance = "
SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");");
fragBuilder->codeAppend("half afwidth;");
bool isUniformScale = (dfPathEffect.getFlags() & kUniformScale_DistanceFieldEffectMask) ==
kUniformScale_DistanceFieldEffectMask;
bool isSimilarity = SkToBool(dfPathEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
bool isGammaCorrect =
SkToBool(dfPathEffect.getFlags() & kGammaCorrect_DistanceFieldEffectFlag);
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 t coordinate in the y direction.
// 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
#ifdef SK_VULKAN
fragBuilder->codeAppendf("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(%s.x));",
st.fsIn());
#else
// We use the y gradient because there is a bug in the Mali 400 in the x direction.
fragBuilder->codeAppendf("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdy(%s.y));",
st.fsIn());
#endif
} else if (isSimilarity) {
// For similarity transform, we adjust 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
#ifdef SK_VULKAN
fragBuilder->codeAppendf("half st_grad_len = length(dFdx(%s));", st.fsIn());
#else
// We use the y gradient because there is a bug in the Mali 400 in the x direction.
fragBuilder->codeAppendf("half st_grad_len = length(dFdy(%s));", st.fsIn());
#endif
fragBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*st_grad_len);");
} 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.
fragBuilder->codeAppend("half2 dist_grad = half2(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
fragBuilder->codeAppend("half dg_len2 = dot(dist_grad, dist_grad);");
fragBuilder->codeAppend("if (dg_len2 < 0.0001) {");
fragBuilder->codeAppend("dist_grad = half2(0.7071, 0.7071);");
fragBuilder->codeAppend("} else {");
fragBuilder->codeAppend("dist_grad = dist_grad*inversesqrt(dg_len2);");
fragBuilder->codeAppend("}");
fragBuilder->codeAppendf("half2 Jdx = dFdx(%s);", st.fsIn());
fragBuilder->codeAppendf("half2 Jdy = dFdy(%s);", st.fsIn());
fragBuilder->codeAppend("half2 grad = half2(dist_grad.x*Jdx.x + dist_grad.y*Jdy.x,");
fragBuilder->codeAppend(" dist_grad.x*Jdx.y + dist_grad.y*Jdy.y);");
// this gives us a smooth step across approximately one fragment
fragBuilder->codeAppend("afwidth = " SK_DistanceFieldAAFactor "*length(grad);");
}
// The smoothstep falloff compensates for the non-linear sRGB response curve. If we are
// doing gamma-correct rendering (to an sRGB or F16 buffer), then we actually want distance
// mapped linearly to coverage, so use a linear step:
if (isGammaCorrect) {
fragBuilder->codeAppend(
"half val = clamp((distance + afwidth) / (2.0 * afwidth), 0.0, 1.0);");
} else {
fragBuilder->codeAppend("half val = smoothstep(-afwidth, afwidth, distance);");
}
fragBuilder->codeAppendf("%s = half4(val);", args.fOutputCoverage);
}