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

        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 emitCode(EmitArgs& args) override {
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     const GrTiledGradientEffect& _outer = args.fFp.cast<GrTiledGradientEffect>();
     (void)_outer;
     auto mirror = _outer.mirror;
     (void)mirror;
     auto makePremul = _outer.makePremul;
     (void)makePremul;
     auto colorsAreOpaque = _outer.colorsAreOpaque;
     (void)colorsAreOpaque;
     SkString _child1("_child1");
     this->emitChild(_outer.gradLayout_index, &_child1, args);
     fragBuilder->codeAppendf(
             "half4 t = %s;\nif (!%s && t.y < 0.0) {\n    %s = half4(0.0);\n} else {\n    @if "
             "(%s) {\n        half t_1 = t.x - 1.0;\n        half tiled_t = (t_1 - 2.0 * "
             "floor(t_1 * 0.5)) - 1.0;\n        if (sk_Caps.mustDoOpBetweenFloorAndAbs) {\n     "
             "       tiled_t = clamp(tiled_t, -1.0, 1.0);\n        }\n        t.x = "
             "abs(tiled_t);\n    } else {\n        t.x = fract(t.x);\n    }",
             _child1.c_str(),
             (_outer.childProcessor(_outer.gradLayout_index).preservesOpaqueInput() ? "true"
                                                                                    : "false"),
             args.fOutputColor, (_outer.mirror ? "true" : "false"));
     SkString _input0("t");
     SkString _child0("_child0");
     this->emitChild(_outer.colorizer_index, _input0.c_str(), &_child0, args);
     fragBuilder->codeAppendf("\n    %s = %s;\n}\[email protected] (%s) {\n    %s.xyz *= %s.w;\n}\n",
                              args.fOutputColor, _child0.c_str(),
                              (_outer.makePremul ? "true" : "false"), args.fOutputColor,
                              args.fOutputColor);
 }

 void emitCode(EmitArgs& args) override {
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     this->emitChild(0, args);
     fragBuilder->codeAppendf("%s.rgb *= %s.rgb;", args.fOutputColor,
                                                 args.fInputColor);
     fragBuilder->codeAppendf("%s *= %s.a;", args.fOutputColor, 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 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 emitCode(EmitArgs& args) override {
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     const GrMagnifierEffect& _outer = args.fFp.cast<GrMagnifierEffect>();
     (void)_outer;
     auto bounds = _outer.bounds();
     (void)bounds;
     auto srcRect = _outer.srcRect();
     (void)srcRect;
     auto xInvZoom = _outer.xInvZoom();
     (void)xInvZoom;
     auto yInvZoom = _outer.yInvZoom();
     (void)yInvZoom;
     auto xInvInset = _outer.xInvInset();
     (void)xInvInset;
     auto yInvInset = _outer.yInvInset();
     (void)yInvInset;
     fBoundsUniformVar = args.fUniformHandler->addUniform(
             kFragment_GrShaderFlag, kFloat4_GrSLType, kDefault_GrSLPrecision, "boundsUniform");
     fXInvZoomVar = args.fUniformHandler->addUniform(
             kFragment_GrShaderFlag, kFloat_GrSLType, kDefault_GrSLPrecision, "xInvZoom");
     fYInvZoomVar = args.fUniformHandler->addUniform(
             kFragment_GrShaderFlag, kFloat_GrSLType, kDefault_GrSLPrecision, "yInvZoom");
     fXInvInsetVar = args.fUniformHandler->addUniform(
             kFragment_GrShaderFlag, kFloat_GrSLType, kDefault_GrSLPrecision, "xInvInset");
     fYInvInsetVar = args.fUniformHandler->addUniform(
             kFragment_GrShaderFlag, kFloat_GrSLType, kDefault_GrSLPrecision, "yInvInset");
     fOffsetVar = args.fUniformHandler->addUniform(
             kFragment_GrShaderFlag, kHalf2_GrSLType, kDefault_GrSLPrecision, "offset");
     SkString sk_TransformedCoords2D_0 = fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
     fragBuilder->codeAppendf(
             "float2 coord = %s;\nfloat2 zoom_coord = float2(%s + half2(coord * "
             "float2(half2(half(%s), half(%s)))));\nfloat2 delta = (coord - %s.xy) * "
             "%s.zw;\ndelta = min(delta, float2(half2(1.0, 1.0) - half2(delta)));\ndelta *= "
             "float2(half2(half(%s), half(%s)));\nhalf weight = 0.0;\nif (delta.x < 2.0 && "
             "delta.y < 2.0) {\n    delta = float2(half2(2.0, 2.0) - half2(delta));\n    half "
             "dist = half(length(delta));\n    dist = half(max(2.0 - float(dist), 0.0));\n    "
             "weight = half(min(float(dist * dist), 1.0));\n} else {\n    ",
             sk_TransformedCoords2D_0.c_str(),
             args.fUniformHandler->getUniformCStr(fOffsetVar),
             args.fUniformHandler->getUniformCStr(fXInvZoomVar),
             args.fUniformHandler->getUniformCStr(fYInvZoomVar),
             args.fUniformHandler->getUniformCStr(fBoundsUniformVar),
             args.fUniformHandler->getUniformCStr(fBoundsUniformVar),
             args.fUniformHandler->getUniformCStr(fXInvInsetVar),
             args.fUniformHandler->getUniformCStr(fYInvInsetVar));
     fragBuilder->codeAppendf(
             "float2 delta_squared = delta * delta;\n    weight = half(min(min(delta_squared.x, "
             "delta_squared.y), 1.0));\n}\n%s = texture(%s, mix(coord, zoom_coord, "
             "float(weight))).%s;\n",
             args.fOutputColor,
             fragBuilder->getProgramBuilder()->samplerVariable(args.fTexSamplers[0]).c_str(),
             fragBuilder->getProgramBuilder()->samplerSwizzle(args.fTexSamplers[0]).c_str());
 }

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

            GrGLSLFPFragmentBuilder* 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 emitCode(EmitArgs& args) override {
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     const GrCircleEffect& _outer = args.fFp.cast<GrCircleEffect>();
     (void)_outer;
     auto edgeType = _outer.edgeType;
     (void)edgeType;
     auto center = _outer.center;
     (void)center;
     auto radius = _outer.radius;
     (void)radius;
     prevRadius = -1.0;
     circleVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kFloat4_GrSLType,
                                                  "circle");
     fragBuilder->codeAppendf(
             "float2 prevCenter;\nfloat prevRadius = %f;\nhalf d;\[email protected] (%d == 2 || %d == 3) {\n "
             "   d = half((length((%s.xy - sk_FragCoord.xy) * %s.w) - 1.0) * %s.z);\n} else {\n "
             "   d = half((1.0 - length((%s.xy - sk_FragCoord.xy) * %s.w)) * %s.z);\n}\[email protected] "
             "((%d == 1 || %d == 3) || %d == 4) {\n    %s = %s * clamp(d, 0.0, 1.0);\n} else "
             "{\n    %s = d > 0.5 ? %s : half4(0.0);\n}\n",
             prevRadius, (int)_outer.edgeType, (int)_outer.edgeType,
             args.fUniformHandler->getUniformCStr(circleVar),
             args.fUniformHandler->getUniformCStr(circleVar),
             args.fUniformHandler->getUniformCStr(circleVar),
             args.fUniformHandler->getUniformCStr(circleVar),
             args.fUniformHandler->getUniformCStr(circleVar),
             args.fUniformHandler->getUniformCStr(circleVar), (int)_outer.edgeType,
             (int)_outer.edgeType, (int)_outer.edgeType, args.fOutputColor, args.fInputColor,
             args.fOutputColor, args.fInputColor);
 }

 void emitCode(EmitArgs& args) override {
     GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
     const GrCircleBlurFragmentProcessor& _outer =
             args.fFp.cast<GrCircleBlurFragmentProcessor>();
     (void)_outer;
     auto circleRect = _outer.circleRect();
     (void)circleRect;
     auto textureRadius = _outer.textureRadius();
     (void)textureRadius;
     auto solidRadius = _outer.solidRadius();
     (void)solidRadius;
     fCircleDataVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf4_GrSLType,
                                                       kDefault_GrSLPrecision, "circleData");
     fragBuilder->codeAppendf(
             "half2 vec = half2(half((sk_FragCoord.x - float(%s.x)) * float(%s.w)), "
             "half((sk_FragCoord.y - float(%s.y)) * float(%s.w)));\nhalf dist = "
             "float(length(vec)) + (0.5 - float(%s.z)) * float(%s.w);\n%s = %s * texture(%s, "
             "float2(half2(dist, 0.5))).%s.w;\n",
             args.fUniformHandler->getUniformCStr(fCircleDataVar),
             args.fUniformHandler->getUniformCStr(fCircleDataVar),
             args.fUniformHandler->getUniformCStr(fCircleDataVar),
             args.fUniformHandler->getUniformCStr(fCircleDataVar),
             args.fUniformHandler->getUniformCStr(fCircleDataVar),
             args.fUniformHandler->getUniformCStr(fCircleDataVar), args.fOutputColor,
             args.fInputColor ? args.fInputColor : "half4(1)",
             fragBuilder->getProgramBuilder()->samplerVariable(args.fTexSamplers[0]).c_str(),
             fragBuilder->getProgramBuilder()->samplerSwizzle(args.fTexSamplers[0]).c_str());
 }

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

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

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 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 );
}