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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SKSL_SPIRVCODEGENERATOR
#define SKSL_SPIRVCODEGENERATOR
#include <stack>
#include <tuple>
#include <unordered_map>
#include "SkSLCodeGenerator.h"
#include "SkSLMemoryLayout.h"
#include "ir/SkSLBinaryExpression.h"
#include "ir/SkSLBoolLiteral.h"
#include "ir/SkSLConstructor.h"
#include "ir/SkSLDoStatement.h"
#include "ir/SkSLFloatLiteral.h"
#include "ir/SkSLIfStatement.h"
#include "ir/SkSLIndexExpression.h"
#include "ir/SkSLInterfaceBlock.h"
#include "ir/SkSLIntLiteral.h"
#include "ir/SkSLFieldAccess.h"
#include "ir/SkSLForStatement.h"
#include "ir/SkSLFunctionCall.h"
#include "ir/SkSLFunctionDeclaration.h"
#include "ir/SkSLFunctionDefinition.h"
#include "ir/SkSLPrefixExpression.h"
#include "ir/SkSLPostfixExpression.h"
#include "ir/SkSLProgramElement.h"
#include "ir/SkSLReturnStatement.h"
#include "ir/SkSLStatement.h"
#include "ir/SkSLSwizzle.h"
#include "ir/SkSLTernaryExpression.h"
#include "ir/SkSLVarDeclarations.h"
#include "ir/SkSLVarDeclarationsStatement.h"
#include "ir/SkSLVariableReference.h"
#include "ir/SkSLWhileStatement.h"
#include "spirv.h"
namespace SkSL {
#define kLast_Capability SpvCapabilityMultiViewport
/**
* Converts a Program into a SPIR-V binary.
*/
class SPIRVCodeGenerator : public CodeGenerator {
public:
class LValue {
public:
virtual ~LValue() {}
// returns a pointer to the lvalue, if possible. If the lvalue cannot be directly referenced
// by a pointer (e.g. vector swizzles), returns 0.
virtual SpvId getPointer() = 0;
virtual SpvId load(OutputStream& out) = 0;
virtual void store(SpvId value, OutputStream& out) = 0;
};
SPIRVCodeGenerator(const Context* context, const Program* program, ErrorReporter* errors,
OutputStream* out)
: INHERITED(program, errors, out)
, fContext(*context)
, fDefaultLayout(MemoryLayout::k140_Standard)
, fCapabilities(1 << SpvCapabilityShader)
, fIdCount(1)
, fBoolTrue(0)
, fBoolFalse(0)
, fSetupFragPosition(false)
, fCurrentBlock(0)
, fSynthetics(nullptr, errors) {
this->setupIntrinsics();
}
bool generateCode() override;
private:
enum IntrinsicKind {
kGLSL_STD_450_IntrinsicKind,
kSPIRV_IntrinsicKind,
kSpecial_IntrinsicKind
};
enum SpecialIntrinsic {
kAtan_SpecialIntrinsic,
kSubpassLoad_SpecialIntrinsic,
kTexelFetch_SpecialIntrinsic,
kTexture_SpecialIntrinsic,
};
void setupIntrinsics();
SpvId nextId();
SpvId getType(const Type& type);
SpvId getType(const Type& type, const MemoryLayout& layout);
SpvId getImageType(const Type& type);
SpvId getFunctionType(const FunctionDeclaration& function);
SpvId getPointerType(const Type& type, SpvStorageClass_ storageClass);
SpvId getPointerType(const Type& type, const MemoryLayout& layout,
SpvStorageClass_ storageClass);
void writePrecisionModifier(const Modifiers& modifiers, SpvId id);
std::vector<SpvId> getAccessChain(const Expression& expr, OutputStream& out);
void writeLayout(const Layout& layout, SpvId target);
void writeLayout(const Layout& layout, SpvId target, int member);
void writeStruct(const Type& type, const MemoryLayout& layout, SpvId resultId);
void writeProgramElement(const ProgramElement& pe, OutputStream& out);
SpvId writeInterfaceBlock(const InterfaceBlock& intf);
SpvId writeFunctionStart(const FunctionDeclaration& f, OutputStream& out);
SpvId writeFunctionDeclaration(const FunctionDeclaration& f, OutputStream& out);
SpvId writeFunction(const FunctionDefinition& f, OutputStream& out);
void writeGlobalVars(Program::Kind kind, const VarDeclarations& v, OutputStream& out);
void writeVarDeclarations(const VarDeclarations& decl, OutputStream& out);
SpvId writeVariableReference(const VariableReference& ref, OutputStream& out);
std::unique_ptr<LValue> getLValue(const Expression& value, OutputStream& out);
SpvId writeExpression(const Expression& expr, OutputStream& out);
SpvId writeIntrinsicCall(const FunctionCall& c, OutputStream& out);
SpvId writeFunctionCall(const FunctionCall& c, OutputStream& out);
SpvId writeSpecialIntrinsic(const FunctionCall& c, SpecialIntrinsic kind, OutputStream& out);
SpvId writeConstantVector(const Constructor& c);
SpvId writeFloatConstructor(const Constructor& c, OutputStream& out);
SpvId writeIntConstructor(const Constructor& c, OutputStream& out);
SpvId writeUIntConstructor(const Constructor& c, OutputStream& out);
/**
* Writes a matrix with the diagonal entries all equal to the provided expression, and all other
* entries equal to zero.
*/
void writeUniformScaleMatrix(SpvId id, SpvId diagonal, const Type& type, OutputStream& out);
/**
* Writes a potentially-different-sized copy of a matrix. Entries which do not exist in the
* source matrix are filled with zero; entries which do not exist in the destination matrix are
* ignored.
*/
void writeMatrixCopy(SpvId id, SpvId src, const Type& srcType, const Type& dstType,
OutputStream& out);
SpvId writeMatrixConstructor(const Constructor& c, OutputStream& out);
SpvId writeVectorConstructor(const Constructor& c, OutputStream& out);
SpvId writeArrayConstructor(const Constructor& c, OutputStream& out);
SpvId writeConstructor(const Constructor& c, OutputStream& out);
SpvId writeFieldAccess(const FieldAccess& f, OutputStream& out);
SpvId writeSwizzle(const Swizzle& swizzle, OutputStream& out);
/**
* Folds the potentially-vector result of a logical operation down to a single bool. If
* operandType is a vector type, assumes that the intermediate result in id is a bvec of the
* same dimensions, and applys all() to it to fold it down to a single bool value. Otherwise,
* returns the original id value.
*/
SpvId foldToBool(SpvId id, const Type& operandType, OutputStream& out);
SpvId writeMatrixComparison(const Type& operandType, SpvId lhs, SpvId rhs, SpvOp_ floatOperator,
SpvOp_ intOperator, OutputStream& out);
SpvId writeBinaryOperation(const Type& resultType, const Type& operandType, SpvId lhs,
SpvId rhs, SpvOp_ ifFloat, SpvOp_ ifInt, SpvOp_ ifUInt,
SpvOp_ ifBool, OutputStream& out);
SpvId writeBinaryOperation(const BinaryExpression& expr, SpvOp_ ifFloat, SpvOp_ ifInt,
SpvOp_ ifUInt, OutputStream& out);
SpvId writeBinaryExpression(const BinaryExpression& b, OutputStream& out);
SpvId writeTernaryExpression(const TernaryExpression& t, OutputStream& out);
SpvId writeIndexExpression(const IndexExpression& expr, OutputStream& out);
SpvId writeLogicalAnd(const BinaryExpression& b, OutputStream& out);
SpvId writeLogicalOr(const BinaryExpression& o, OutputStream& out);
SpvId writePrefixExpression(const PrefixExpression& p, OutputStream& out);
SpvId writePostfixExpression(const PostfixExpression& p, OutputStream& out);
SpvId writeBoolLiteral(const BoolLiteral& b);
SpvId writeIntLiteral(const IntLiteral& i);
SpvId writeFloatLiteral(const FloatLiteral& f);
void writeStatement(const Statement& s, OutputStream& out);
void writeBlock(const Block& b, OutputStream& out);
void writeIfStatement(const IfStatement& stmt, OutputStream& out);
void writeForStatement(const ForStatement& f, OutputStream& out);
void writeWhileStatement(const WhileStatement& w, OutputStream& out);
void writeDoStatement(const DoStatement& d, OutputStream& out);
void writeReturnStatement(const ReturnStatement& r, OutputStream& out);
void writeCapabilities(OutputStream& out);
void writeInstructions(const Program& program, OutputStream& out);
void writeOpCode(SpvOp_ opCode, int length, OutputStream& out);
void writeWord(int32_t word, OutputStream& out);
void writeString(const char* string, OutputStream& out);
void writeLabel(SpvId id, OutputStream& out);
void writeInstruction(SpvOp_ opCode, OutputStream& out);
void writeInstruction(SpvOp_ opCode, const char* string, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, const char* string, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, const char* string,
OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, int32_t word3,
OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, int32_t word3, int32_t word4,
OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, int32_t word3, int32_t word4,
int32_t word5, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, int32_t word3, int32_t word4,
int32_t word5, int32_t word6, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, int32_t word3, int32_t word4,
int32_t word5, int32_t word6, int32_t word7, OutputStream& out);
void writeInstruction(SpvOp_ opCode, int32_t word1, int32_t word2, int32_t word3, int32_t word4,
int32_t word5, int32_t word6, int32_t word7, int32_t word8,
OutputStream& out);
void writeGeometryShaderExecutionMode(SpvId entryPoint, OutputStream& out);
const Context& fContext;
const MemoryLayout fDefaultLayout;
uint64_t fCapabilities;
SpvId fIdCount;
SpvId fGLSLExtendedInstructions;
typedef std::tuple<IntrinsicKind, int32_t, int32_t, int32_t, int32_t> Intrinsic;
std::unordered_map<String, Intrinsic> fIntrinsicMap;
std::unordered_map<const FunctionDeclaration*, SpvId> fFunctionMap;
std::unordered_map<const Variable*, SpvId> fVariableMap;
std::unordered_map<const Variable*, int32_t> fInterfaceBlockMap;
std::unordered_map<String, SpvId> fImageTypeMap;
std::unordered_map<String, SpvId> fTypeMap;
StringStream fCapabilitiesBuffer;
StringStream fGlobalInitializersBuffer;
StringStream fConstantBuffer;
StringStream fExtraGlobalsBuffer;
StringStream fExternalFunctionsBuffer;
StringStream fVariableBuffer;
StringStream fNameBuffer;
StringStream fDecorationBuffer;
SpvId fBoolTrue;
SpvId fBoolFalse;
std::unordered_map<int64_t, SpvId> fIntConstants;
std::unordered_map<uint64_t, SpvId> fUIntConstants;
std::unordered_map<float, SpvId> fFloatConstants;
std::unordered_map<double, SpvId> fDoubleConstants;
bool fSetupFragPosition;
// label of the current block, or 0 if we are not in a block
SpvId fCurrentBlock;
std::stack<SpvId> fBreakTarget;
std::stack<SpvId> fContinueTarget;
SpvId fRTHeightStructId = (SpvId) -1;
SpvId fRTHeightFieldIndex = (SpvId) -1;
// holds variables synthesized during output, for lifetime purposes
SymbolTable fSynthetics;
friend class PointerLValue;
friend class SwizzleLValue;
typedef CodeGenerator INHERITED;
};
}
#endif