C++ GrGLSLFragmentBuilder::codeAppendf方法代码示例

void GrGLConvexPolyEffect::emitCode(EmitArgs& args) {
    const GrConvexPolyEffect& cpe = args.fFp.cast<GrConvexPolyEffect>();

    const char *edgeArrayName;
    fEdgeUniform = args.fUniformHandler->addUniformArray(GrGLSLUniformHandler::kFragment_Visibility,
                                                         kVec3f_GrSLType,
                                                         kDefault_GrSLPrecision,
                                                         "edges",
                                                         cpe.getEdgeCount(),
                                                         &edgeArrayName);
    GrGLSLFragmentBuilder* 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 emitCode(EmitArgs& args) override {
     GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
     const char* colorUni;
     fColorUniform = args.fUniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                                      kVec4f_GrSLType, kMedium_GrSLPrecision,
                                                      "constantColor",
                                                      &colorUni);
     GrConstColorProcessor::InputMode mode = args.fFp.cast<GrConstColorProcessor>().inputMode();
     if (!args.fInputColor) {
         mode = GrConstColorProcessor::kIgnore_InputMode;
     }
     switch (mode) {
         case GrConstColorProcessor::kIgnore_InputMode:
             fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, colorUni);
             break;
         case GrConstColorProcessor::kModulateRGBA_InputMode:
             fragBuilder->codeAppendf("%s = %s * %s;", args.fOutputColor, args.fInputColor,
                                    colorUni);
             break;
         case GrConstColorProcessor::kModulateA_InputMode:
             fragBuilder->codeAppendf("%s = %s.a * %s;", args.fOutputColor, args.fInputColor,
                                    colorUni);
             break;
     }
 }

        void emitCode(EmitArgs& args) override {
            GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
            fMatrixHandle = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                                       kMat44f_GrSLType, kDefault_GrSLPrecision,
                                                       "ColorMatrix");
            fVectorHandle = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                                       kVec4f_GrSLType, kDefault_GrSLPrecision,
                                                       "ColorMatrixVector");

            if (nullptr == args.fInputColor) {
                // could optimize this case, but we aren't for now.
                args.fInputColor = "vec4(1)";
            }
            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
            // The max() is to guard against 0 / 0 during unpremul when the incoming color is
            // transparent black.
            fragBuilder->codeAppendf("\tfloat nonZeroAlpha = max(%s.a, 0.00001);\n",
                                     args.fInputColor);
            fragBuilder->codeAppendf("\t%s = %s * vec4(%s.rgb / nonZeroAlpha, nonZeroAlpha) + %s;\n",
                                     args.fOutputColor,
                                     uniformHandler->getUniformCStr(fMatrixHandle),
                                     args.fInputColor,
                                     uniformHandler->getUniformCStr(fVectorHandle));
            fragBuilder->codeAppendf("\t%s = clamp(%s, 0.0, 1.0);\n",
                                     args.fOutputColor, args.fOutputColor);
            fragBuilder->codeAppendf("\t%s.rgb *= %s.a;\n", args.fOutputColor, args.fOutputColor);
        }

 virtual void emitCode(EmitArgs& args) override {
     // pass through
     GrGLSLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
     if (args.fInputColor) {
         fsBuilder->codeAppendf("%s = %s;\n", args.fOutputColor, args.fInputColor);
     } else {
         fsBuilder->codeAppendf("%s = vec4(1.0);\n", args.fOutputColor);
     }
 }

 void emitCode(EmitArgs& args) override {
     // pass through
     GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
     if (args.fInputColor) {
         fragBuilder->codeAppendf("%s = %s;\n", args.fOutputColor, args.fInputColor);
     } else {
         fragBuilder->codeAppendf("%s = vec4(1.0);\n", args.fOutputColor);
     }
 }

 void emitCode(EmitArgs& args) override {
     GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
     fragBuilder->codeAppendf("vec2 c = %s;",
                              fragBuilder->ensureFSCoords2D(args.fCoords, 0).c_str());
     fragBuilder->codeAppend("vec2 r = mod(c, vec2(20.0));");
     fragBuilder->codeAppend("vec4 color = vec4(0.5*sin(c.x / 15.0) + 0.5,"
                                           "0.5*cos((c.x + c.y) / 15.0) + 0.5,"
                                           "(r.x + r.y) / 20.0,"
                                           "distance(r, vec2(15.0)) / 20.0 + 0.2);");
     fragBuilder->codeAppendf("color.rgb *= color.a;"
                              "%s = color * %s;",
                              args.fOutputColor, GrGLSLExpr4(args.fInputColor).c_str());
 }

        void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
            const QuadEdgeEffect& qe = args.fGP.cast<QuadEdgeEffect>();
            GrGLSLGPBuilder* pb = args.fPB;
            GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
            GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;

            // emit attributes
            varyingHandler->emitAttributes(qe);

            GrGLSLVertToFrag v(kVec4f_GrSLType);
            varyingHandler->addVarying("QuadEdge", &v);
            vertBuilder->codeAppendf("%s = %s;", v.vsOut(), qe.inQuadEdge()->fName);

            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
            // Setup pass through color
            if (!qe.colorIgnored()) {
                this->setupUniformColor(pb, fragBuilder, args.fOutputColor, &fColorUniform);
            }

            // Setup position
            this->setupPosition(pb, vertBuilder, gpArgs, qe.inPosition()->fName);

            // emit transforms
            this->emitTransforms(args.fPB,
                                 vertBuilder,
                                 varyingHandler,
                                 gpArgs->fPositionVar,
                                 qe.inPosition()->fName,
                                 qe.localMatrix(),
                                 args.fTransformsIn,
                                 args.fTransformsOut);

            SkAssertResult(fragBuilder->enableFeature(
                    GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
            fragBuilder->codeAppendf("float edgeAlpha;");

            // keep the derivative instructions outside the conditional
            fragBuilder->codeAppendf("vec2 duvdx = dFdx(%s.xy);", v.fsIn());
            fragBuilder->codeAppendf("vec2 duvdy = dFdy(%s.xy);", v.fsIn());
            fragBuilder->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
            fragBuilder->codeAppendf("edgeAlpha = min(min(%s.z, %s.w) + 0.5, 1.0);", v.fsIn(),
                                     v.fsIn());
            fragBuilder->codeAppendf ("} else {");
            fragBuilder->codeAppendf("vec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,"
                                     "               2.0*%s.x*duvdy.x - duvdy.y);",
                                     v.fsIn(), v.fsIn());
            fragBuilder->codeAppendf("edgeAlpha = (%s.x*%s.x - %s.y);", v.fsIn(), v.fsIn(),
                                     v.fsIn());
            fragBuilder->codeAppendf("edgeAlpha = "
                                     "clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);}");

            fragBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
        }

        void emitCode(EmitArgs& args) override {
            if (nullptr == args.fInputColor) {
                args.fInputColor = "vec4(1)";
            }

            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
            fragBuilder->codeAppendf("\tfloat luma = dot(vec3(%f, %f, %f), %s.rgb);\n",
                                     SK_ITU_BT709_LUM_COEFF_R,
                                     SK_ITU_BT709_LUM_COEFF_G,
                                     SK_ITU_BT709_LUM_COEFF_B,
                                     args.fInputColor);
            fragBuilder->codeAppendf("\t%s = vec4(0, 0, 0, luma);\n",
                                     args.fOutputColor);

        }

void GLDitherEffect::emitCode(EmitArgs& args) {
    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
    // Generate a random number based on the fragment position. For this
    // random number generator, we use the "GLSL rand" function
    // that seems to be floating around on the internet. It works under
    // the assumption that sin(<big number>) oscillates with high frequency
    // and sampling it will generate "randomness". Since we're using this
    // for rendering and not cryptography it should be OK.

    // For each channel c, add the random offset to the pixel to either bump
    // it up or let it remain constant during quantization.
    fragBuilder->codeAppendf("\t\tfloat r = "
                             "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.5453);\n",
                             fragBuilder->fragmentPosition());
    fragBuilder->codeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n",
                             args.fOutputColor, GrGLSLExpr4(args.fInputColor).c_str());
}

void GrGLSLFragmentProcessor::emitChild(int childIndex, const char* inputColor,
                                        SkString* outputColor, EmitArgs& args) {

    SkASSERT(outputColor);
    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
    outputColor->append(fragBuilder->getMangleString());
    fragBuilder->codeAppendf("vec4 %s;", outputColor->c_str());
    this->internalEmitChild(childIndex, inputColor, outputColor->c_str(), args);
}

 virtual void emitCode(EmitArgs& args) override {
     GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
     fragBuilder->codeAppendf("\t%s = ", args.fOutputColor);
     fragBuilder->appendTextureLookupAndModulate(args.fInputColor,
                                               args.fSamplers[0],
                                               args.fCoords[0].c_str(),
                                               args.fCoords[0].getType());
     fragBuilder->codeAppend(";\n");
 }

        void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
            const PLSFinishEffect& fe = args.fGP.cast<PLSFinishEffect>();
            GrGLSLVertexBuilder* vsBuilder = args.fVertBuilder;
            GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
            GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;

            fUseEvenOdd = uniformHandler->addUniform(kFragment_GrShaderFlag,
                                                    kFloat_GrSLType, kLow_GrSLPrecision, 
                                                    "useEvenOdd");
            const char* useEvenOdd = uniformHandler->getUniformCStr(fUseEvenOdd);

            varyingHandler->emitAttributes(fe);
            this->setupPosition(vsBuilder, gpArgs, fe.inPosition()->fName);
            this->emitTransforms(vsBuilder, varyingHandler, uniformHandler, gpArgs->fPositionVar, 
                                 fe.inPosition()->fName, fe.localMatrix(), args.fTransformsIn, 
                                 args.fTransformsOut);

            GrGLSLFragmentBuilder* fsBuilder = args.fFragBuilder;
            SkAssertResult(fsBuilder->enableFeature(
                           GrGLSLFragmentShaderBuilder::kPixelLocalStorage_GLSLFeature));
            fsBuilder->declAppendf(GR_GL_PLS_PATH_DATA_DECL);
            fsBuilder->codeAppend("float coverage;");
            fsBuilder->codeAppendf("if (%s != 0.0) {", useEvenOdd);
            fsBuilder->codeAppend("coverage = float(abs(pls.windings[0]) % 2) * 0.25;");
            fsBuilder->codeAppend("coverage += float(abs(pls.windings[1]) % 2) * 0.25;");
            fsBuilder->codeAppend("coverage += float(abs(pls.windings[2]) % 2) * 0.25;");
            fsBuilder->codeAppend("coverage += float(abs(pls.windings[3]) % 2) * 0.25;");
            fsBuilder->codeAppend("} else {");
            fsBuilder->codeAppend("coverage = pls.windings[0] != 0 ? 0.25 : 0.0;");
            fsBuilder->codeAppend("coverage += pls.windings[1] != 0 ? 0.25 : 0.0;");
            fsBuilder->codeAppend("coverage += pls.windings[2] != 0 ? 0.25 : 0.0;");
            fsBuilder->codeAppend("coverage += pls.windings[3] != 0 ? 0.25 : 0.0;");
            fsBuilder->codeAppend("}");
            if (!fe.colorIgnored()) {
                this->setupUniformColor(fsBuilder, uniformHandler, args.fOutputColor, 
                                        &fColorUniform);
            }
            fsBuilder->codeAppendf("%s = vec4(coverage);", args.fOutputCoverage);
            fsBuilder->codeAppendf("%s = vec4(1.0, 0.0, 1.0, 1.0);", args.fOutputColor);
        }

void GrGLConvolutionEffect::emitCode(EmitArgs& args) {
    const GrConvolutionEffect& ce = args.fFp.cast<GrConvolutionEffect>();

    GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
    fImageIncrementUni = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                                    kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                    "ImageIncrement");
    if (ce.useBounds()) {
        fBoundsUni = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                                kVec2f_GrSLType, kDefault_GrSLPrecision,
                                                "Bounds");
    }

    int width = Gr1DKernelEffect::WidthFromRadius(ce.radius());

    fKernelUni = uniformHandler->addUniformArray(GrGLSLUniformHandler::kFragment_Visibility,
                                                 kFloat_GrSLType, kDefault_GrSLPrecision,
                                                 "Kernel", width);

    GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
    SkString coords2D = fragBuilder->ensureFSCoords2D(args.fCoords, 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.
    for (int i = 0; i < width; i++) {
        SkString index;
        SkString kernelIndex;
        index.appendS32(i);
        kernel.appendArrayAccess(index.c_str(), &kernelIndex);

        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.fSamplers[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 emitCode(EmitArgs& args) override {
        GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
        const GrPathProcessor& pathProc = args.fGP.cast<GrPathProcessor>();

        // emit transforms
        this->emitTransforms(args.fVaryingHandler, args.fTransformsIn, args.fTransformsOut);

        // Setup uniform color
        if (pathProc.overrides().readsColor()) {
            const char* stagedLocalVarName;
            fColorUniform = args.fUniformHandler->addUniform(
                                                         GrGLSLUniformHandler::kFragment_Visibility,
                                                         kVec4f_GrSLType,
                                                         kDefault_GrSLPrecision,
                                                         "Color",
                                                         &stagedLocalVarName);
            fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, stagedLocalVarName);
        }

        // setup constant solid coverage
        if (pathProc.overrides().readsCoverage()) {
            fragBuilder->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
        }
    }

void GrGLMagnifierEffect::emitCode(EmitArgs& args) {
    GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
    fOffsetVar = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                            kVec2f_GrSLType, kDefault_GrSLPrecision,
                                            "Offset");
    fInvZoomVar = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                             kVec2f_GrSLType, kDefault_GrSLPrecision,
                                             "InvZoom");
    fInvInsetVar = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                              kVec2f_GrSLType, kDefault_GrSLPrecision,
                                              "InvInset");
    fBoundsVar = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
                                            kVec4f_GrSLType, kDefault_GrSLPrecision,
                                            "Bounds");

    GrGLSLFragmentBuilder* 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.fSamplers[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());
}