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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrSkSLFP.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLProgramBuilder.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrTexture.h"
#include "SkSLUtil.h"
GrSkSLFPFactory::GrSkSLFPFactory(const char* name, const GrShaderCaps* shaderCaps, const char* sksl)
: fName(name) {
SkSL::Program::Settings settings;
settings.fCaps = shaderCaps;
fBaseProgram = fCompiler.convertProgram(SkSL::Program::kPipelineStage_Kind,
SkSL::String(sksl),
settings);
if (fCompiler.errorCount()) {
SkDebugf("%s\n", fCompiler.errorText().c_str());
}
SkASSERT(fBaseProgram);
SkASSERT(!fCompiler.errorCount());
for (const auto& e : *fBaseProgram) {
if (e.fKind == SkSL::ProgramElement::kVar_Kind) {
SkSL::VarDeclarations& v = (SkSL::VarDeclarations&) e;
for (const auto& varStatement : v.fVars) {
const SkSL::Variable& var = *((SkSL::VarDeclaration&) *varStatement).fVar;
if (var.fModifiers.fFlags & SkSL::Modifiers::kIn_Flag) {
fInputVars.push_back(&var);
}
if (var.fModifiers.fLayout.fKey) {
fKeyVars.push_back(&var);
}
}
}
}
}
std::unique_ptr<GrFragmentProcessor> GrSkSLFPFactory::make(const void* inputs, size_t inputSize) {
SkASSERT(!fCompiler.errorCount());
SkSL::String key;
size_t offset = 0;
for (const auto& v : fInputVars) {
if (&v->fType == fCompiler.context().fInt_Type.get()) {
offset = SkAlign4(offset);
if (v->fModifiers.fLayout.fKey) {
key += ((char*) inputs)[offset + 0];
key += ((char*) inputs)[offset + 1];
key += ((char*) inputs)[offset + 2];
key += ((char*) inputs)[offset + 3];
}
offset += sizeof(int32_t);
}
else {
// unsupported input var type
SkASSERT(false);
}
}
SkASSERT(offset == inputSize);
return std::unique_ptr<GrFragmentProcessor>(new GrSkSLFP(this, inputs, inputSize,
std::move(key)));
}
const SkSL::Program* GrSkSLFPFactory::getSpecialization(const SkSL::String& key, const void* inputs,
size_t inputSize) {
const auto& found = fSpecializations.find(key);
if (found != fSpecializations.end()) {
return found->second.get();
}
std::unordered_map<SkSL::String, SkSL::Program::Settings::Value> inputMap;
size_t offset = 0;
for (const auto& v : fInputVars) {
SkSL::String name(v->fName);
if (&v->fType == fCompiler.context().fInt_Type.get()) {
offset = SkAlign4(offset);
int32_t v = *(int32_t*) (((uint8_t*) inputs) + offset);
inputMap.insert(std::make_pair(name, SkSL::Program::Settings::Value(v)));
offset += sizeof(int32_t);
}
}
SkASSERT(offset == inputSize);
std::unique_ptr<SkSL::Program> specialized = fCompiler.specialize(*fBaseProgram, inputMap);
SkAssertResult(fCompiler.optimize(*specialized));
const SkSL::Program* result = specialized.get();
fSpecializations.insert(std::make_pair(key, std::move(specialized)));
return result;
}
class GrGLSLSkSLFP : public GrGLSLFragmentProcessor {
public:
GrGLSLSkSLFP(SkSL::String glsl, std::vector<SkSL::Compiler::FormatArg> formatArgs)
: fGLSL(glsl)
, fFormatArgs(formatArgs) {}
void emitCode(EmitArgs& args) override {
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
int substringStartIndex = 0;
int formatArgIndex = 0;
for (size_t i = 0; i < fGLSL.length(); ++i) {
char c = fGLSL[i];
if (c == '%') {
fragBuilder->codeAppend(fGLSL.c_str() + substringStartIndex,
i - substringStartIndex);
++i;
c = fGLSL[i];
switch (c) {
case 's':
switch (fFormatArgs[formatArgIndex++]) {
case SkSL::Compiler::FormatArg::kInput:
fragBuilder->codeAppend(args.fInputColor ? args.fInputColor
: "half4(1)");
break;
case SkSL::Compiler::FormatArg::kOutput:
fragBuilder->codeAppend(args.fOutputColor);
break;
}
break;
default:
fragBuilder->codeAppendf("%c", c);
}
substringStartIndex = i + 1;
}
}
fragBuilder->codeAppend(fGLSL.c_str() + substringStartIndex,
fGLSL.length() - substringStartIndex);
}
// nearly-finished GLSL; still contains printf-style "%s" format tokens
const SkSL::String fGLSL;
std::vector<SkSL::Compiler::FormatArg> fFormatArgs;
};
std::unique_ptr<GrFragmentProcessor> GrSkSLFP::Make(GrContext* context, int index, const char* name,
const char* sksl, const void* inputs,
size_t inputSize) {
GrSkSLFPFactory* factory = context->contextPriv().getFPFactory(index);
if (!factory) {
factory = new GrSkSLFPFactory(name, context->contextPriv().caps()->shaderCaps(), sksl);
context->contextPriv().setFPFactory(index, factory);
}
return factory->make(inputs, inputSize);
}
const char* GrSkSLFP::name() const {
return fFactory.fName;
}
GrGLSLFragmentProcessor* GrSkSLFP::onCreateGLSLInstance() const {
const SkSL::Program* specialized = fFactory.getSpecialization(fKey, fInputs.get(), fInputSize);
SkSL::String glsl;
std::vector<SkSL::Compiler::FormatArg> formatArgs;
if (!fFactory.fCompiler.toPipelineStage(*specialized, &glsl, &formatArgs)) {
printf("%s\n", fFactory.fCompiler.errorText().c_str());
abort();
}
return new GrGLSLSkSLFP(glsl, formatArgs);
}
void GrSkSLFP::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
const char* current = fKey.data();
size_t length = fKey.length();
for (size_t i = 0; i < length / 4; ++i) {
b->add32(*(int32_t*) current);
current += 4;
}
size_t excessCount = length % 4;
if (excessCount) {
int32_t excess = 0;
for (size_t i = 0; i < excessCount; ++i) {
excess <<= 8;
excess += *current;
++current;
}
b->add32(excess);
}
}
bool GrSkSLFP::onIsEqual(const GrFragmentProcessor& other) const {
const GrSkSLFP& sk = other.cast<GrSkSLFP>();
SkASSERT(fFactory.fBaseProgram != sk.fFactory.fBaseProgram || fInputSize == sk.fInputSize);
return fFactory.fBaseProgram == sk.fFactory.fBaseProgram &&
!memcmp(fInputs.get(), sk.fInputs.get(), fInputSize);
}
std::unique_ptr<GrFragmentProcessor> GrSkSLFP::clone() const {
return std::unique_ptr<GrFragmentProcessor>(new GrSkSLFP(*this));
}
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrSkSLFP);
#if GR_TEST_UTILS
#include "SkGr.h"
using Value = SkSL::Program::Settings::Value;
std::unique_ptr<GrFragmentProcessor> GrSkSLFP::TestCreate(GrProcessorTestData* d) {
int type = d->fRandom->nextULessThan(1);
switch (type) {
case 0: {
static int ditherIndex = NewIndex();
int rangeType = d->fRandom->nextULessThan(3);
return GrSkSLFP::Make(d->context(), ditherIndex, "Dither", SKSL_DITHER_SRC, &rangeType,
sizeof(rangeType));
}
}
SK_ABORT("unreachable");
return nullptr;
}
#endif
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