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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_WRITER_GLSL_GENERATOR_IMPL_H_
#define SRC_WRITER_GLSL_GENERATOR_IMPL_H_
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include "src/ast/assignment_statement.h"
#include "src/ast/bitcast_expression.h"
#include "src/ast/break_statement.h"
#include "src/ast/continue_statement.h"
#include "src/ast/discard_statement.h"
#include "src/ast/for_loop_statement.h"
#include "src/ast/if_statement.h"
#include "src/ast/loop_statement.h"
#include "src/ast/return_statement.h"
#include "src/ast/switch_statement.h"
#include "src/ast/unary_op_expression.h"
#include "src/program_builder.h"
#include "src/scope_stack.h"
#include "src/transform/decompose_memory_access.h"
#include "src/utils/hash.h"
#include "src/writer/text_generator.h"
namespace tint {
// Forward declarations
namespace sem {
class Call;
class Intrinsic;
} // namespace sem
namespace writer {
namespace glsl {
/// Implementation class for GLSL generator
class GeneratorImpl : public TextGenerator {
public:
/// Constructor
/// @param program the program to generate
explicit GeneratorImpl(const Program* program);
~GeneratorImpl();
/// @returns true on successful generation; false otherwise
bool Generate();
/// Handles an array accessor expression
/// @param out the output of the expression stream
/// @param expr the expression to emit
/// @returns true if the array accessor was emitted
bool EmitArrayAccessor(std::ostream& out, ast::ArrayAccessorExpression* expr);
/// Handles an assignment statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted successfully
bool EmitAssign(ast::AssignmentStatement* stmt);
/// Handles generating a binary expression
/// @param out the output of the expression stream
/// @param expr the binary expression
/// @returns true if the expression was emitted, false otherwise
bool EmitBinary(std::ostream& out, ast::BinaryExpression* expr);
/// Handles generating a bitcast expression
/// @param out the output of the expression stream
/// @param expr the as expression
/// @returns true if the bitcast was emitted
bool EmitBitcast(std::ostream& out, ast::BitcastExpression* expr);
/// Emits a list of statements
/// @param stmts the statement list
/// @returns true if the statements were emitted successfully
bool EmitStatements(const ast::StatementList& stmts);
/// Emits a list of statements with an indentation
/// @param stmts the statement list
/// @returns true if the statements were emitted successfully
bool EmitStatementsWithIndent(const ast::StatementList& stmts);
/// Handles a block statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted successfully
bool EmitBlock(const ast::BlockStatement* stmt);
/// Handles a break statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted successfully
bool EmitBreak(ast::BreakStatement* stmt);
/// Handles generating a call expression
/// @param out the output of the expression stream
/// @param expr the call expression
/// @returns true if the call expression is emitted
bool EmitCall(std::ostream& out, ast::CallExpression* expr);
/// Handles generating a barrier intrinsic call
/// @param out the output of the expression stream
/// @param intrinsic the semantic information for the barrier intrinsic
/// @returns true if the call expression is emitted
bool EmitBarrierCall(std::ostream& out, const sem::Intrinsic* intrinsic);
/// Handles generating an atomic intrinsic call for a storage buffer variable
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the atomic intrinsic
/// @returns true if the call expression is emitted
bool EmitStorageAtomicCall(
std::ostream& out,
ast::CallExpression* expr,
const transform::DecomposeMemoryAccess::Intrinsic* intrinsic);
/// Handles generating an atomic intrinsic call for a workgroup variable
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the atomic intrinsic
/// @returns true if the call expression is emitted
bool EmitWorkgroupAtomicCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles generating a call to a texture function (`textureSample`,
/// `textureSampleGrad`, etc)
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the texture intrinsic
/// @returns true if the call expression is emitted
bool EmitTextureCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles generating a call to the `select()` intrinsic
/// @param out the output of the expression stream
/// @param expr the call expression
/// @returns true if the call expression is emitted
bool EmitSelectCall(std::ostream& out, ast::CallExpression* expr);
/// Handles generating a call to the `modf()` intrinsic
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the intrinsic
/// @returns true if the call expression is emitted
bool EmitModfCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles generating a call to the `frexp()` intrinsic
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the intrinsic
/// @returns true if the call expression is emitted
bool EmitFrexpCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles generating a call to the `isNormal()` intrinsic
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the intrinsic
/// @returns true if the call expression is emitted
bool EmitIsNormalCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles generating a call to data packing intrinsic
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the texture intrinsic
/// @returns true if the call expression is emitted
bool EmitDataPackingCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles generating a call to data unpacking intrinsic
/// @param out the output of the expression stream
/// @param expr the call expression
/// @param intrinsic the semantic information for the texture intrinsic
/// @returns true if the call expression is emitted
bool EmitDataUnpackingCall(std::ostream& out,
ast::CallExpression* expr,
const sem::Intrinsic* intrinsic);
/// Handles a case statement
/// @param stmt the statement
/// @returns true if the statement was emitted successfully
bool EmitCase(ast::CaseStatement* stmt);
/// Handles generating constructor expressions
/// @param out the output of the expression stream
/// @param expr the constructor expression
/// @returns true if the expression was emitted
bool EmitConstructor(std::ostream& out, ast::ConstructorExpression* expr);
/// Handles generating a discard statement
/// @param stmt the discard statement
/// @returns true if the statement was successfully emitted
bool EmitDiscard(ast::DiscardStatement* stmt);
/// Handles generating a scalar constructor
/// @param out the output of the expression stream
/// @param expr the scalar constructor expression
/// @returns true if the scalar constructor is emitted
bool EmitScalarConstructor(std::ostream& out,
ast::ScalarConstructorExpression* expr);
/// Handles emitting a type constructor
/// @param out the output of the expression stream
/// @param expr the type constructor expression
/// @returns true if the constructor is emitted
bool EmitTypeConstructor(std::ostream& out,
ast::TypeConstructorExpression* expr);
/// Handles a continue statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted successfully
bool EmitContinue(ast::ContinueStatement* stmt);
/// Handles generate an Expression
/// @param out the output of the expression stream
/// @param expr the expression
/// @returns true if the expression was emitted
bool EmitExpression(std::ostream& out, ast::Expression* expr);
/// Handles generating a function
/// @param func the function to generate
/// @returns true if the function was emitted
bool EmitFunction(ast::Function* func);
/// Handles emitting a global variable
/// @param global the global variable
/// @returns true on success
bool EmitGlobalVariable(ast::Variable* global);
/// Handles emitting a global variable with the uniform storage class
/// @param var the global variable
/// @returns true on success
bool EmitUniformVariable(const sem::Variable* var);
/// Handles emitting a global variable with the storage storage class
/// @param var the global variable
/// @returns true on success
bool EmitStorageVariable(const sem::Variable* var);
/// Handles emitting a global variable with the handle storage class
/// @param var the global variable
/// @returns true on success
bool EmitHandleVariable(const sem::Variable* var);
/// Handles emitting a global variable with the private storage class
/// @param var the global variable
/// @returns true on success
bool EmitPrivateVariable(const sem::Variable* var);
/// Handles emitting a global variable with the workgroup storage class
/// @param var the global variable
/// @returns true on success
bool EmitWorkgroupVariable(const sem::Variable* var);
/// Handles emitting the entry point function
/// @param func the entry point
/// @returns true if the entry point function was emitted
bool EmitEntryPointFunction(ast::Function* func);
/// Handles an if statement
/// @param stmt the statement to emit
/// @returns true if the statement was successfully emitted
bool EmitIf(ast::IfStatement* stmt);
/// Handles a literal
/// @param out the output stream
/// @param lit the literal to emit
/// @returns true if the literal was successfully emitted
bool EmitLiteral(std::ostream& out, ast::Literal* lit);
/// Handles a loop statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted
bool EmitLoop(ast::LoopStatement* stmt);
/// Handles a for loop statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted
bool EmitForLoop(ast::ForLoopStatement* stmt);
/// Handles generating an identifier expression
/// @param out the output of the expression stream
/// @param expr the identifier expression
/// @returns true if the identifeir was emitted
bool EmitIdentifier(std::ostream& out, ast::IdentifierExpression* expr);
/// Handles a member accessor expression
/// @param out the output of the expression stream
/// @param expr the member accessor expression
/// @returns true if the member accessor was emitted
bool EmitMemberAccessor(std::ostream& out,
ast::MemberAccessorExpression* expr);
/// Handles return statements
/// @param stmt the statement to emit
/// @returns true if the statement was successfully emitted
bool EmitReturn(ast::ReturnStatement* stmt);
/// Handles statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted
bool EmitStatement(ast::Statement* stmt);
/// Handles generating a switch statement
/// @param stmt the statement to emit
/// @returns true if the statement was emitted
bool EmitSwitch(ast::SwitchStatement* stmt);
/// Handles generating type
/// @param out the output stream
/// @param type the type to generate
/// @param storage_class the storage class of the variable
/// @param access the access control type of the variable
/// @param name the name of the variable, used for array emission.
/// @param name_printed (optional) if not nullptr and an array was printed
/// then the boolean is set to true.
/// @returns true if the type is emitted
bool EmitType(std::ostream& out,
const sem::Type* type,
ast::StorageClass storage_class,
ast::Access access,
const std::string& name,
bool* name_printed = nullptr);
/// Handles generating type and name
/// @param out the output stream
/// @param type the type to generate
/// @param storage_class the storage class of the variable
/// @param access the access control type of the variable
/// @param name the name to emit
/// @returns true if the type is emitted
bool EmitTypeAndName(std::ostream& out,
const sem::Type* type,
ast::StorageClass storage_class,
ast::Access access,
const std::string& name);
/// Handles generating a structure declaration
/// @param buffer the text buffer that the type declaration will be written to
/// @param ty the struct to generate
/// @returns true if the struct is emitted
bool EmitStructType(TextBuffer* buffer, const sem::Struct* ty);
/// Handles a unary op expression
/// @param out the output of the expression stream
/// @param expr the expression to emit
/// @returns true if the expression was emitted
bool EmitUnaryOp(std::ostream& out, ast::UnaryOpExpression* expr);
/// Emits the zero value for the given type
/// @param out the output stream
/// @param type the type to emit the value for
/// @returns true if the zero value was successfully emitted.
bool EmitZeroValue(std::ostream& out, const sem::Type* type);
/// Handles generating a variable
/// @param var the variable to generate
/// @returns true if the variable was emitted
bool EmitVariable(ast::Variable* var);
/// Handles generating a program scope constant variable
/// @param var the variable to emit
/// @returns true if the variable was emitted
bool EmitProgramConstVariable(const ast::Variable* var);
/// Handles generating a builtin method name
/// @param intrinsic the semantic info for the intrinsic
/// @returns the name or "" if not valid
std::string generate_builtin_name(const sem::Intrinsic* intrinsic);
/// Converts a builtin to a gl_ string
/// @param builtin the builtin to convert
/// @returns the string name of the builtin or blank on error
const char* builtin_to_string(ast::Builtin builtin) const;
/// Converts a builtin to a sem::Type appropriate for GLSL.
/// @param builtin the builtin to convert
/// @returns the appropriate semantic type or null on error.
sem::Type* builtin_type(ast::Builtin builtin);
/// Converts interpolation attributes to a GLSL modifiers
/// @param type the interpolation type
/// @param sampling the interpolation sampling
/// @returns the string name of the attribute or blank on error
std::string interpolation_to_modifiers(
ast::InterpolationType type,
ast::InterpolationSampling sampling) const;
private:
enum class VarType { kIn, kOut };
struct EntryPointData {
std::string struct_name;
std::string var_name;
};
struct DMAIntrinsic {
transform::DecomposeMemoryAccess::Intrinsic::Op op;
transform::DecomposeMemoryAccess::Intrinsic::DataType type;
bool operator==(const DMAIntrinsic& rhs) const {
return op == rhs.op && type == rhs.type;
}
/// Hasher is a std::hash function for DMAIntrinsic
struct Hasher {
/// @param i the DMAIntrinsic to hash
/// @returns the hash of `i`
inline std::size_t operator()(const DMAIntrinsic& i) const {
return utils::Hash(i.op, i.type);
}
};
};
/// CallIntrinsicHelper will call the intrinsic helper function, creating it
/// if it hasn't been built already. If the intrinsic needs to be built then
/// CallIntrinsicHelper will generate the function signature and will call
/// `build` to emit the body of the function.
/// @param out the output of the expression stream
/// @param call the call expression
/// @param intrinsic the semantic information for the intrinsic
/// @param build a function with the signature:
/// `bool(TextBuffer* buffer, const std::vector<std::string>& params)`
/// Where:
/// `buffer` is the body of the generated function
/// `params` is the name of all the generated function parameters
/// @returns true if the call expression is emitted
template <typename F>
bool CallIntrinsicHelper(std::ostream& out,
ast::CallExpression* call,
const sem::Intrinsic* intrinsic,
F&& build);
TextBuffer helpers_; // Helper functions emitted at the top of the output
std::function<bool()> emit_continuing_;
std::unordered_map<DMAIntrinsic, std::string, DMAIntrinsic::Hasher>
dma_intrinsics_;
std::unordered_map<const sem::Intrinsic*, std::string> intrinsics_;
std::unordered_map<const sem::Struct*, std::string> structure_builders_;
std::unordered_map<const sem::Vector*, std::string> dynamic_vector_write_;
};
} // namespace glsl
} // namespace writer
} // namespace tint
#endif // SRC_WRITER_GLSL_GENERATOR_IMPL_H_