GrSkSLFP::Impl Class Reference

Inheritance diagram for GrSkSLFP::Impl:

Public Member Functions
void	emitCode (EmitArgs &args) override
Public Member Functions inherited from GrFragmentProcessor::ProgramImpl
	ProgramImpl ()=default
virtual	~ProgramImpl ()=default
void	setData (const GrGLSLProgramDataManager &pdman, const GrFragmentProcessor &processor)
int	numChildProcessors () const
ProgramImpl *	childProcessor (int index) const
void	setFunctionName (SkString name)
const char *	functionName () const
SkString	invokeChild (int childIndex, EmitArgs &parentArgs, std::string_view skslCoords={})
SkString	invokeChildWithMatrix (int childIndex, EmitArgs &parentArgs)
SkString	invokeChild (int childIndex, const char *inputColor, EmitArgs &parentArgs, std::string_view skslCoords={})
SkString	invokeChildWithMatrix (int childIndex, const char *inputColor, EmitArgs &parentArgs)
SkString	invokeChild (int childIndex, const char *inputColor, const char *destColor, EmitArgs &parentArgs, std::string_view skslCoords={})
SkString	invokeChildWithMatrix (int childIndex, const char *inputColor, const char *destColor, EmitArgs &parentArgs)

Private Member Functions
void	onSetData (const GrGLSLProgramDataManager &pdman, const GrFragmentProcessor &_proc) override

Additional Inherited Members
Public Types inherited from GrFragmentProcessor::ProgramImpl
using	UniformHandle = GrGLSLUniformHandler::UniformHandle
using	SamplerHandle = GrGLSLUniformHandler::SamplerHandle

Detailed Description

Definition at line 50 of file GrSkSLFP.cpp.

Member Function Documentation

emitCode()

void GrSkSLFP::Impl::emitCode ( EmitArgs &  args )

inlineoverridevirtual

Implements GrFragmentProcessor::ProgramImpl.

Definition at line 52 of file GrSkSLFP.cpp.

                                           {
        const GrSkSLFP& fp            = args.fFp.cast<GrSkSLFP>();
        const SkSL::Program& program  = *fp.fEffect->fBaseProgram;
 
        class FPCallbacks : public SkSL::PipelineStage::Callbacks {
        public:
            FPCallbacks(Impl* self,
                        EmitArgs& args,
                        const char* inputColor,
                        const SkSL::Context& context,
                        const uint8_t* uniformData,
                        const Specialized* specialized)
                    : fSelf(self)
                    , fArgs(args)
                    , fInputColor(inputColor)
                    , fContext(context)
                    , fUniformData(uniformData)
                    , fSpecialized(specialized) {}
 
            std::string declareUniform(const SkSL::VarDeclaration* decl) override {
                const SkSL::Variable* var = decl->var();
                if (var->type().isOpaque()) {
                    // Nothing to do. The only opaque types we should see are children, and those
                    // are handled specially.
                    SkASSERT(var->type().isEffectChild());
                    return std::string(var->name());
                }
 
                const SkSL::Type* type = &var->type();
                size_t sizeInBytes = type->slotCount() * sizeof(float);
                const float* floatData = reinterpret_cast<const float*>(fUniformData);
                const int* intData = reinterpret_cast<const int*>(fUniformData);
                fUniformData += sizeInBytes;
 
                bool isArray = false;
                if (type->isArray()) {
                    type = &type->componentType();
                    isArray = true;
                }
 
                SkSLType gpuType;
                SkAssertResult(SkSL::type_to_sksltype(fContext, *type, &gpuType));
 
                if (*fSpecialized++ == Specialized::kYes) {
                    SkASSERTF(!isArray, "specializing array uniforms is not allowed");
                    std::string value = SkSLTypeString(gpuType);
                    value.append("(");
 
                    bool isFloat = SkSLTypeIsFloatType(gpuType);
                    size_t slots = type->slotCount();
                    for (size_t i = 0; i < slots; ++i) {
                        value.append(isFloat ? skstd::to_string(floatData[i])
                                             : std::to_string(intData[i]));
                        value.append(",");
                    }
                    value.back() = ')';
                    return value;
                }
 
                const char* uniformName = nullptr;
                auto handle =
                        fArgs.fUniformHandler->addUniformArray(&fArgs.fFp.cast<GrSkSLFP>(),
                                                               kFragment_GrShaderFlag,
                                                               gpuType,
                                                               SkString(var->name()).c_str(),
                                                               isArray ? var->type().columns() : 0,
                                                               &uniformName);
                fSelf->fUniformHandles.push_back(handle);
                return std::string(uniformName);
            }
 
            std::string getMangledName(const char* name) override {
                return std::string(fArgs.fFragBuilder->getMangledFunctionName(name).c_str());
            }
 
            void defineFunction(const char* decl, const char* body, bool isMain) override {
                if (isMain) {
                    fArgs.fFragBuilder->codeAppend(body);
                } else {
                    fArgs.fFragBuilder->emitFunction(decl, body);
                }
            }
 
            void declareFunction(const char* decl) override {
                fArgs.fFragBuilder->emitFunctionPrototype(decl);
            }
 
            void defineStruct(const char* definition) override {
                fArgs.fFragBuilder->definitionAppend(definition);
            }
 
            void declareGlobal(const char* declaration) override {
                fArgs.fFragBuilder->definitionAppend(declaration);
            }
 
            std::string sampleShader(int index, std::string coords) override {
                // If the child was sampled using the coords passed to main (and they are never
                // modified), then we will have marked the child as PassThrough. The code generator
                // doesn't know that, and still supplies coords. Inside invokeChild, we assert that
                // any coords passed for a PassThrough child match args.fSampleCoords exactly.
                //
                // Normally, this is valid. Here, we *copied* the sample coords to a local variable
                // (so that they're mutable in the runtime effect SkSL). Thus, the coords string we
                // get here is the name of the local copy, and fSampleCoords still points to the
                // unmodified original (which might be a varying, for example).
                // To prevent the assert, we pass the empty string in this case. Note that for
                // children sampled like this, invokeChild doesn't even use the coords parameter,
                // except for that assert.
                const GrFragmentProcessor* child = fArgs.fFp.childProcessor(index);
                if (child && child->sampleUsage().isPassThrough()) {
                    coords.clear();
                }
                return child ? std::string(fSelf->invokeChild(index, fInputColor, fArgs, coords)
                                                   .c_str())
                             : std::string("half4(0)");
            }
 
            std::string sampleColorFilter(int index, std::string color) override {
                return std::string(fSelf->invokeChild(index,
                                                      color.empty() ? fInputColor : color.c_str(),
                                                      fArgs)
                                           .c_str());
            }
 
            std::string sampleBlender(int index, std::string src, std::string dst) override {
                if (!fSelf->childProcessor(index)) {
                    return SkSL::String::printf("blend_src_over(%s, %s)", src.c_str(), dst.c_str());
                }
                return std::string(
                        fSelf->invokeChild(index, src.c_str(), dst.c_str(), fArgs).c_str());
            }
 
            // These intrinsics take and return 3-component vectors, but child FPs operate on
            // 4-component vectors. We use swizzles here to paper over the difference.
            std::string toLinearSrgb(std::string color) override {
                const GrSkSLFP& fp = fArgs.fFp.cast<GrSkSLFP>();
                if (fp.fToLinearSrgbChildIndex < 0) {
                    return color;
                }
                color = SkSL::String::printf("(%s).rgb1", color.c_str());
                SkString xformedColor = fSelf->invokeChild(
                        fp.fToLinearSrgbChildIndex, color.c_str(), fArgs);
                return SkSL::String::printf("(%s).rgb", xformedColor.c_str());
            }
 
            std::string fromLinearSrgb(std::string color) override {
                const GrSkSLFP& fp = fArgs.fFp.cast<GrSkSLFP>();
                if (fp.fFromLinearSrgbChildIndex < 0) {
                    return color;
                }
                color = SkSL::String::printf("(%s).rgb1", color.c_str());
                SkString xformedColor = fSelf->invokeChild(
                        fp.fFromLinearSrgbChildIndex, color.c_str(), fArgs);
                return SkSL::String::printf("(%s).rgb", xformedColor.c_str());
            }
 
            Impl*                         fSelf;
            EmitArgs&                     fArgs;
            const char*                   fInputColor;
            const SkSL::Context&          fContext;
            const uint8_t*                fUniformData;
            const Specialized*            fSpecialized;
            int                           fUniformIndex = 0;
        };
 
        // If we have an input child, we invoke it now, and make the result of that be the "input
        // color" for all other purposes later (eg, the default passed via sample calls, etc.)
        if (fp.fInputChildIndex >= 0) {
            args.fFragBuilder->codeAppendf("%s = %s;\n",
                                           args.fInputColor,
                                           this->invokeChild(fp.fInputChildIndex, args).c_str());
        }
 
        if (fp.fEffect->allowBlender()) {
            // If we have an dest-color child, we invoke it now, and make the result of that be the
            // "dest color" for all other purposes later.
            if (fp.fDestColorChildIndex >= 0) {
                args.fFragBuilder->codeAppendf(
                        "%s = %s;\n",
                        args.fDestColor,
                        this->invokeChild(fp.fDestColorChildIndex, args.fDestColor, args).c_str());
            }
        } else {
            // We're not making a blender, so we don't expect a dest-color child FP to exist.
            SkASSERT(fp.fDestColorChildIndex < 0);
        }
 
        // Snap off a global copy of the input color at the start of main. We need this when
        // we call child processors (particularly from helper functions, which can't "see" the
        // parameter to main). Even from within main, if the code mutates the parameter, calls to
        // sample should still be passing the original color (by default).
        SkString inputColorName;
        if (fp.fEffect->samplesOutsideMain()) {
            GrShaderVar inputColorCopy(args.fFragBuilder->getMangledFunctionName("inColor"),
                                       SkSLType::kHalf4);
            args.fFragBuilder->declareGlobal(inputColorCopy);
            inputColorName = inputColorCopy.getName();
            args.fFragBuilder->codeAppendf("%s = %s;\n", inputColorName.c_str(), args.fInputColor);
        } else {
            inputColorName = args.fFragBuilder->newTmpVarName("inColor");
            args.fFragBuilder->codeAppendf(
                    "half4 %s = %s;\n", inputColorName.c_str(), args.fInputColor);
        }
 
        // Copy the incoming coords to a local variable. Code in main might modify the coords
        // parameter. fSampleCoord could be a varying, so writes to it would be illegal.
        const char* coords = "float2(0)";
        SkString coordsVarName;
        if (fp.usesSampleCoordsDirectly()) {
            coordsVarName = args.fFragBuilder->newTmpVarName("coords");
            coords = coordsVarName.c_str();
            args.fFragBuilder->codeAppendf("float2 %s = %s;\n", coords, args.fSampleCoord);
        }
 
        FPCallbacks callbacks(this,
                              args,
                              inputColorName.c_str(),
                              *program.fContext,
                              fp.uniformData(),
                              fp.specialized());
        SkSL::PipelineStage::ConvertProgram(
                program, coords, args.fInputColor, args.fDestColor, &callbacks);
    }

onSetData()

void GrSkSLFP::Impl::onSetData ( const GrGLSLProgramDataManager &  , const GrFragmentProcessor &    )

inlineoverrideprivatevirtual

A ProgramImpl instance can be reused with any GrFragmentProcessor that produces the same the same key; this function reads data from a GrFragmentProcessor and uploads any uniform variables required by the shaders created in emitCode(). The GrFragmentProcessor parameter is guaranteed to be of the same type that created this ProgramImpl and to have an identical key as the one that created this ProgramImpl.

Reimplemented from GrFragmentProcessor::ProgramImpl.

Definition at line 277 of file GrSkSLFP.cpp.

                                                              {
        const GrSkSLFP& outer = _proc.cast<GrSkSLFP>();
        pdman.setRuntimeEffectUniforms(outer.fEffect->uniforms(),
                                       SkSpan(fUniformHandles),
                                       SkSpan(outer.specialized(), outer.uniformCount()),
                                       outer.uniformData());
    }

---

The documentation for this class was generated from the following file:

• third_party/skia/src/gpu/ganesh/effects/GrSkSLFP.cpp