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// Copyright 2020 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.
#include "src/writer/wgsl/generator_impl.h"
#include <cassert>
#include <limits>
#include "src/ast/array_accessor_expression.h"
#include "src/ast/assignment_statement.h"
#include "src/ast/binary_expression.h"
#include "src/ast/binding_decoration.h"
#include "src/ast/bitcast_expression.h"
#include "src/ast/block_statement.h"
#include "src/ast/bool_literal.h"
#include "src/ast/break_statement.h"
#include "src/ast/builtin_decoration.h"
#include "src/ast/call_expression.h"
#include "src/ast/call_statement.h"
#include "src/ast/case_statement.h"
#include "src/ast/constant_id_decoration.h"
#include "src/ast/constructor_expression.h"
#include "src/ast/continue_statement.h"
#include "src/ast/else_statement.h"
#include "src/ast/float_literal.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/if_statement.h"
#include "src/ast/location_decoration.h"
#include "src/ast/loop_statement.h"
#include "src/ast/member_accessor_expression.h"
#include "src/ast/return_statement.h"
#include "src/ast/scalar_constructor_expression.h"
#include "src/ast/set_decoration.h"
#include "src/ast/sint_literal.h"
#include "src/ast/stage_decoration.h"
#include "src/ast/statement.h"
#include "src/ast/stride_decoration.h"
#include "src/ast/struct.h"
#include "src/ast/struct_member.h"
#include "src/ast/struct_member_offset_decoration.h"
#include "src/ast/switch_statement.h"
#include "src/ast/type/access_control_type.h"
#include "src/ast/type/array_type.h"
#include "src/ast/type/bool_type.h"
#include "src/ast/type/depth_texture_type.h"
#include "src/ast/type/f32_type.h"
#include "src/ast/type/i32_type.h"
#include "src/ast/type/matrix_type.h"
#include "src/ast/type/multisampled_texture_type.h"
#include "src/ast/type/pointer_type.h"
#include "src/ast/type/sampled_texture_type.h"
#include "src/ast/type/sampler_type.h"
#include "src/ast/type/storage_texture_type.h"
#include "src/ast/type/struct_type.h"
#include "src/ast/type/u32_type.h"
#include "src/ast/type/vector_type.h"
#include "src/ast/type/void_type.h"
#include "src/ast/type_constructor_expression.h"
#include "src/ast/uint_literal.h"
#include "src/ast/unary_op_expression.h"
#include "src/ast/variable.h"
#include "src/ast/variable_decl_statement.h"
#include "src/ast/workgroup_decoration.h"
#include "src/writer/float_to_string.h"
namespace tint {
namespace writer {
namespace wgsl {
GeneratorImpl::GeneratorImpl() : TextGenerator() {}
GeneratorImpl::~GeneratorImpl() = default;
bool GeneratorImpl::Generate(const ast::Module& module) {
for (auto* const ty : module.constructed_types()) {
if (!EmitConstructedType(ty)) {
return false;
}
}
if (!module.constructed_types().empty())
out_ << std::endl;
for (auto* var : module.global_variables()) {
if (!EmitVariable(var)) {
return false;
}
}
if (!module.global_variables().empty()) {
out_ << std::endl;
}
for (auto* func : module.functions()) {
if (!EmitFunction(func)) {
return false;
}
out_ << std::endl;
}
return true;
}
bool GeneratorImpl::GenerateEntryPoint(const ast::Module& module,
ast::PipelineStage stage,
const std::string& name) {
auto* func =
module.FindFunctionBySymbolAndStage(module.GetSymbol(name), stage);
if (func == nullptr) {
error_ = "Unable to find requested entry point: " + name;
return false;
}
// TODO(dsinclair): We always emit constructed types even if they aren't
// strictly needed
for (auto* const ty : module.constructed_types()) {
if (!EmitConstructedType(ty)) {
return false;
}
}
if (!module.constructed_types().empty()) {
out_ << std::endl;
}
// TODO(dsinclair): This should be smarter and only emit needed const
// variables
for (auto* var : module.global_variables()) {
if (!var->is_const()) {
continue;
}
if (!EmitVariable(var)) {
return false;
}
}
bool found_func_variable = false;
for (auto* var : func->referenced_module_variables()) {
if (!EmitVariable(var)) {
return false;
}
found_func_variable = true;
}
if (found_func_variable) {
out_ << std::endl;
}
for (auto* f : module.functions()) {
if (!f->HasAncestorEntryPoint(module.GetSymbol(name))) {
continue;
}
if (!EmitFunction(f)) {
return false;
}
out_ << std::endl;
}
if (!EmitFunction(func)) {
return false;
}
out_ << std::endl;
return true;
}
bool GeneratorImpl::EmitConstructedType(const ast::type::Type* ty) {
make_indent();
if (auto* alias = ty->As<ast::type::Alias>()) {
out_ << "type " << alias->name() << " = ";
if (!EmitType(alias->type())) {
return false;
}
out_ << ";" << std::endl;
} else if (auto* str = ty->As<ast::type::Struct>()) {
if (!EmitStructType(str)) {
return false;
}
} else {
error_ = "unknown constructed type: " + ty->type_name();
return false;
}
return true;
}
bool GeneratorImpl::EmitExpression(ast::Expression* expr) {
if (auto* a = expr->As<ast::ArrayAccessorExpression>()) {
return EmitArrayAccessor(a);
}
if (auto* b = expr->As<ast::BinaryExpression>()) {
return EmitBinary(b);
}
if (auto* b = expr->As<ast::BitcastExpression>()) {
return EmitBitcast(b);
}
if (auto* c = expr->As<ast::CallExpression>()) {
return EmitCall(c);
}
if (auto* i = expr->As<ast::IdentifierExpression>()) {
return EmitIdentifier(i);
}
if (auto* c = expr->As<ast::ConstructorExpression>()) {
return EmitConstructor(c);
}
if (auto* m = expr->As<ast::MemberAccessorExpression>()) {
return EmitMemberAccessor(m);
}
if (auto* u = expr->As<ast::UnaryOpExpression>()) {
return EmitUnaryOp(u);
}
error_ = "unknown expression type";
return false;
}
bool GeneratorImpl::EmitArrayAccessor(ast::ArrayAccessorExpression* expr) {
if (!EmitExpression(expr->array())) {
return false;
}
out_ << "[";
if (!EmitExpression(expr->idx_expr())) {
return false;
}
out_ << "]";
return true;
}
bool GeneratorImpl::EmitMemberAccessor(ast::MemberAccessorExpression* expr) {
if (!EmitExpression(expr->structure())) {
return false;
}
out_ << ".";
return EmitExpression(expr->member());
}
bool GeneratorImpl::EmitBitcast(ast::BitcastExpression* expr) {
out_ << "bitcast<";
if (!EmitType(expr->type())) {
return false;
}
out_ << ">(";
if (!EmitExpression(expr->expr())) {
return false;
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitCall(ast::CallExpression* expr) {
if (!EmitExpression(expr->func())) {
return false;
}
out_ << "(";
bool first = true;
const auto& params = expr->params();
for (auto* param : params) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitExpression(param)) {
return false;
}
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitConstructor(ast::ConstructorExpression* expr) {
if (auto* scalar = expr->As<ast::ScalarConstructorExpression>()) {
return EmitScalarConstructor(scalar);
}
return EmitTypeConstructor(expr->As<ast::TypeConstructorExpression>());
}
bool GeneratorImpl::EmitTypeConstructor(ast::TypeConstructorExpression* expr) {
if (!EmitType(expr->type())) {
return false;
}
out_ << "(";
bool first = true;
for (auto* e : expr->values()) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitExpression(e)) {
return false;
}
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitScalarConstructor(
ast::ScalarConstructorExpression* expr) {
return EmitLiteral(expr->literal());
}
bool GeneratorImpl::EmitLiteral(ast::Literal* lit) {
if (auto* bl = lit->As<ast::BoolLiteral>()) {
out_ << (bl->IsTrue() ? "true" : "false");
} else if (auto* fl = lit->As<ast::FloatLiteral>()) {
out_ << FloatToString(fl->value());
} else if (auto* sl = lit->As<ast::SintLiteral>()) {
out_ << sl->value();
} else if (auto* ul = lit->As<ast::UintLiteral>()) {
out_ << ul->value() << "u";
} else {
error_ = "unknown literal type";
return false;
}
return true;
}
bool GeneratorImpl::EmitIdentifier(ast::IdentifierExpression* expr) {
auto* ident = expr->As<ast::IdentifierExpression>();
out_ << ident->name();
return true;
}
bool GeneratorImpl::EmitFunction(ast::Function* func) {
for (auto* deco : func->decorations()) {
make_indent();
out_ << "[[";
if (auto* workgroup = deco->As<ast::WorkgroupDecoration>()) {
uint32_t x = 0;
uint32_t y = 0;
uint32_t z = 0;
std::tie(x, y, z) = workgroup->values();
out_ << "workgroup_size(" << std::to_string(x) << ", "
<< std::to_string(y) << ", " << std::to_string(z) << ")";
}
if (auto* stage = deco->As<ast::StageDecoration>()) {
out_ << "stage(" << stage->value() << ")";
}
out_ << "]]" << std::endl;
}
make_indent();
out_ << "fn " << func->name() << "(";
bool first = true;
for (auto* v : func->params()) {
if (!first) {
out_ << ", ";
}
first = false;
out_ << v->name() << " : ";
if (!EmitType(v->type())) {
return false;
}
}
out_ << ") -> ";
if (!EmitType(func->return_type())) {
return false;
}
out_ << " ";
return EmitBlockAndNewline(func->body());
}
bool GeneratorImpl::EmitImageFormat(const ast::type::ImageFormat fmt) {
switch (fmt) {
case ast::type::ImageFormat::kNone:
error_ = "unknown image format";
return false;
default:
out_ << fmt;
}
return true;
}
bool GeneratorImpl::EmitType(ast::type::Type* type) {
if (auto* ac = type->As<ast::type::AccessControl>()) {
out_ << "[[access(";
if (ac->IsReadOnly()) {
out_ << "read";
} else if (ac->IsReadWrite()) {
out_ << "read_write";
} else {
error_ = "invalid access control";
return false;
}
out_ << ")]]" << std::endl;
if (!EmitType(ac->type())) {
return false;
}
} else if (auto* alias = type->As<ast::type::Alias>()) {
out_ << alias->name();
} else if (auto* ary = type->As<ast::type::Array>()) {
for (auto* deco : ary->decorations()) {
if (auto* stride = deco->As<ast::StrideDecoration>()) {
out_ << "[[stride(" << stride->stride() << ")]] ";
}
}
out_ << "array<";
if (!EmitType(ary->type())) {
return false;
}
if (!ary->IsRuntimeArray())
out_ << ", " << ary->size();
out_ << ">";
} else if (type->Is<ast::type::Bool>()) {
out_ << "bool";
} else if (type->Is<ast::type::F32>()) {
out_ << "f32";
} else if (type->Is<ast::type::I32>()) {
out_ << "i32";
} else if (auto* mat = type->As<ast::type::Matrix>()) {
out_ << "mat" << mat->columns() << "x" << mat->rows() << "<";
if (!EmitType(mat->type())) {
return false;
}
out_ << ">";
} else if (auto* ptr = type->As<ast::type::Pointer>()) {
out_ << "ptr<" << ptr->storage_class() << ", ";
if (!EmitType(ptr->type())) {
return false;
}
out_ << ">";
} else if (auto* sampler = type->As<ast::type::Sampler>()) {
out_ << "sampler";
if (sampler->IsComparison()) {
out_ << "_comparison";
}
} else if (auto* str = type->As<ast::type::Struct>()) {
// The struct, as a type, is just the name. We should have already emitted
// the declaration through a call to |EmitStructType| earlier.
out_ << str->name();
} else if (auto* texture = type->As<ast::type::Texture>()) {
out_ << "texture_";
if (texture->Is<ast::type::DepthTexture>()) {
out_ << "depth_";
} else if (texture->Is<ast::type::SampledTexture>()) {
/* nothing to emit */
} else if (texture->Is<ast::type::MultisampledTexture>()) {
out_ << "multisampled_";
} else if (auto* storage = texture->As<ast::type::StorageTexture>()) {
out_ << "storage_";
if (storage->access() == ast::AccessControl::kReadOnly) {
out_ << "ro_";
} else if (storage->access() == ast::AccessControl::kWriteOnly) {
out_ << "wo_";
} else {
error_ = "unknown storage texture access";
return false;
}
} else {
error_ = "unknown texture type";
return false;
}
switch (texture->dim()) {
case ast::type::TextureDimension::k1d:
out_ << "1d";
break;
case ast::type::TextureDimension::k1dArray:
out_ << "1d_array";
break;
case ast::type::TextureDimension::k2d:
out_ << "2d";
break;
case ast::type::TextureDimension::k2dArray:
out_ << "2d_array";
break;
case ast::type::TextureDimension::k3d:
out_ << "3d";
break;
case ast::type::TextureDimension::kCube:
out_ << "cube";
break;
case ast::type::TextureDimension::kCubeArray:
out_ << "cube_array";
break;
default:
error_ = "unknown texture dimension";
return false;
}
if (auto* sampled = texture->As<ast::type::SampledTexture>()) {
out_ << "<";
if (!EmitType(sampled->type())) {
return false;
}
out_ << ">";
} else if (auto* ms = texture->As<ast::type::MultisampledTexture>()) {
out_ << "<";
if (!EmitType(ms->type())) {
return false;
}
out_ << ">";
} else if (auto* storage = texture->As<ast::type::StorageTexture>()) {
out_ << "<";
if (!EmitImageFormat(storage->image_format())) {
return false;
}
out_ << ">";
}
} else if (type->Is<ast::type::U32>()) {
out_ << "u32";
} else if (auto* vec = type->As<ast::type::Vector>()) {
out_ << "vec" << vec->size() << "<";
if (!EmitType(vec->type())) {
return false;
}
out_ << ">";
} else if (type->Is<ast::type::Void>()) {
out_ << "void";
} else {
error_ = "unknown type in EmitType: " + type->type_name();
return false;
}
return true;
}
bool GeneratorImpl::EmitStructType(const ast::type::Struct* str) {
auto* impl = str->impl();
for (auto* deco : impl->decorations()) {
out_ << "[[";
deco->to_str(out_, 0);
out_ << "]]" << std::endl;
}
out_ << "struct " << str->name() << " {" << std::endl;
increment_indent();
for (auto* mem : impl->members()) {
for (auto* deco : mem->decorations()) {
make_indent();
// TODO(dsinclair): Split this out when we have more then one
auto* offset = deco->As<ast::StructMemberOffsetDecoration>();
assert(offset != nullptr);
out_ << "[[offset(" << offset->offset() << ")]]" << std::endl;
}
make_indent();
out_ << mem->name() << " : ";
if (!EmitType(mem->type())) {
return false;
}
out_ << ";" << std::endl;
}
decrement_indent();
make_indent();
out_ << "};" << std::endl;
return true;
}
bool GeneratorImpl::EmitVariable(ast::Variable* var) {
make_indent();
if (!var->decorations().empty() && !EmitVariableDecorations(var)) {
return false;
}
if (var->is_const()) {
out_ << "const";
} else {
out_ << "var";
if (var->storage_class() != ast::StorageClass::kNone &&
var->storage_class() != ast::StorageClass::kFunction) {
out_ << "<" << var->storage_class() << ">";
}
}
out_ << " " << var->name() << " : ";
if (!EmitType(var->type())) {
return false;
}
if (var->constructor() != nullptr) {
out_ << " = ";
if (!EmitExpression(var->constructor())) {
return false;
}
}
out_ << ";" << std::endl;
return true;
}
bool GeneratorImpl::EmitVariableDecorations(ast::Variable* var) {
out_ << "[[";
bool first = true;
for (auto* deco : var->decorations()) {
if (!first) {
out_ << ", ";
}
first = false;
if (auto* binding = deco->As<ast::BindingDecoration>()) {
out_ << "binding(" << binding->value() << ")";
} else if (auto* set = deco->As<ast::SetDecoration>()) {
out_ << "set(" << set->value() << ")";
} else if (auto* location = deco->As<ast::LocationDecoration>()) {
out_ << "location(" << location->value() << ")";
} else if (auto* builtin = deco->As<ast::BuiltinDecoration>()) {
out_ << "builtin(" << builtin->value() << ")";
} else if (auto* constant = deco->As<ast::ConstantIdDecoration>()) {
out_ << "constant_id(" << constant->value() << ")";
} else {
error_ = "unknown variable decoration";
return false;
}
}
out_ << "]] ";
return true;
}
bool GeneratorImpl::EmitBinary(ast::BinaryExpression* expr) {
out_ << "(";
if (!EmitExpression(expr->lhs())) {
return false;
}
out_ << " ";
switch (expr->op()) {
case ast::BinaryOp::kAnd:
out_ << "&";
break;
case ast::BinaryOp::kOr:
out_ << "|";
break;
case ast::BinaryOp::kXor:
out_ << "^";
break;
case ast::BinaryOp::kLogicalAnd:
out_ << "&&";
break;
case ast::BinaryOp::kLogicalOr:
out_ << "||";
break;
case ast::BinaryOp::kEqual:
out_ << "==";
break;
case ast::BinaryOp::kNotEqual:
out_ << "!=";
break;
case ast::BinaryOp::kLessThan:
out_ << "<";
break;
case ast::BinaryOp::kGreaterThan:
out_ << ">";
break;
case ast::BinaryOp::kLessThanEqual:
out_ << "<=";
break;
case ast::BinaryOp::kGreaterThanEqual:
out_ << ">=";
break;
case ast::BinaryOp::kShiftLeft:
out_ << "<<";
break;
case ast::BinaryOp::kShiftRight:
out_ << ">>";
break;
case ast::BinaryOp::kAdd:
out_ << "+";
break;
case ast::BinaryOp::kSubtract:
out_ << "-";
break;
case ast::BinaryOp::kMultiply:
out_ << "*";
break;
case ast::BinaryOp::kDivide:
out_ << "/";
break;
case ast::BinaryOp::kModulo:
out_ << "%";
break;
case ast::BinaryOp::kNone:
error_ = "missing binary operation type";
return false;
}
out_ << " ";
if (!EmitExpression(expr->rhs())) {
return false;
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitUnaryOp(ast::UnaryOpExpression* expr) {
switch (expr->op()) {
case ast::UnaryOp::kNot:
out_ << "!";
break;
case ast::UnaryOp::kNegation:
out_ << "-";
break;
}
out_ << "(";
if (!EmitExpression(expr->expr())) {
return false;
}
out_ << ")";
return true;
}
bool GeneratorImpl::EmitBlock(const ast::BlockStatement* stmt) {
out_ << "{" << std::endl;
increment_indent();
for (auto* s : *stmt) {
if (!EmitStatement(s)) {
return false;
}
}
decrement_indent();
make_indent();
out_ << "}";
return true;
}
bool GeneratorImpl::EmitIndentedBlockAndNewline(
const ast::BlockStatement* stmt) {
make_indent();
const bool result = EmitBlock(stmt);
if (result) {
out_ << std::endl;
}
return result;
}
bool GeneratorImpl::EmitBlockAndNewline(const ast::BlockStatement* stmt) {
const bool result = EmitBlock(stmt);
if (result) {
out_ << std::endl;
}
return result;
}
bool GeneratorImpl::EmitStatement(ast::Statement* stmt) {
if (auto* a = stmt->As<ast::AssignmentStatement>()) {
return EmitAssign(a);
}
if (auto* b = stmt->As<ast::BlockStatement>()) {
return EmitIndentedBlockAndNewline(b);
}
if (auto* b = stmt->As<ast::BreakStatement>()) {
return EmitBreak(b);
}
if (auto* c = stmt->As<ast::CallStatement>()) {
make_indent();
if (!EmitCall(c->expr())) {
return false;
}
out_ << ";" << std::endl;
return true;
}
if (auto* c = stmt->As<ast::ContinueStatement>()) {
return EmitContinue(c);
}
if (auto* d = stmt->As<ast::DiscardStatement>()) {
return EmitDiscard(d);
}
if (auto* f = stmt->As<ast::FallthroughStatement>()) {
return EmitFallthrough(f);
}
if (auto* i = stmt->As<ast::IfStatement>()) {
return EmitIf(i);
}
if (auto* l = stmt->As<ast::LoopStatement>()) {
return EmitLoop(l);
}
if (auto* r = stmt->As<ast::ReturnStatement>()) {
return EmitReturn(r);
}
if (auto* s = stmt->As<ast::SwitchStatement>()) {
return EmitSwitch(s);
}
if (auto* v = stmt->As<ast::VariableDeclStatement>()) {
return EmitVariable(v->variable());
}
error_ = "unknown statement type: " + stmt->str();
return false;
}
bool GeneratorImpl::EmitAssign(ast::AssignmentStatement* stmt) {
make_indent();
if (!EmitExpression(stmt->lhs())) {
return false;
}
out_ << " = ";
if (!EmitExpression(stmt->rhs())) {
return false;
}
out_ << ";" << std::endl;
return true;
}
bool GeneratorImpl::EmitBreak(ast::BreakStatement*) {
make_indent();
out_ << "break;" << std::endl;
return true;
}
bool GeneratorImpl::EmitCase(ast::CaseStatement* stmt) {
make_indent();
if (stmt->IsDefault()) {
out_ << "default";
} else {
out_ << "case ";
bool first = true;
for (auto* selector : stmt->selectors()) {
if (!first) {
out_ << ", ";
}
first = false;
if (!EmitLiteral(selector)) {
return false;
}
}
}
out_ << ": ";
return EmitBlockAndNewline(stmt->body());
}
bool GeneratorImpl::EmitContinue(ast::ContinueStatement*) {
make_indent();
out_ << "continue;" << std::endl;
return true;
}
bool GeneratorImpl::EmitElse(ast::ElseStatement* stmt) {
if (stmt->HasCondition()) {
out_ << " elseif (";
if (!EmitExpression(stmt->condition())) {
return false;
}
out_ << ") ";
} else {
out_ << " else ";
}
return EmitBlock(stmt->body());
}
bool GeneratorImpl::EmitFallthrough(ast::FallthroughStatement*) {
make_indent();
out_ << "fallthrough;" << std::endl;
return true;
}
bool GeneratorImpl::EmitIf(ast::IfStatement* stmt) {
make_indent();
out_ << "if (";
if (!EmitExpression(stmt->condition())) {
return false;
}
out_ << ") ";
if (!EmitBlock(stmt->body())) {
return false;
}
for (auto* e : stmt->else_statements()) {
if (!EmitElse(e)) {
return false;
}
}
out_ << std::endl;
return true;
}
bool GeneratorImpl::EmitDiscard(ast::DiscardStatement*) {
make_indent();
out_ << "discard;" << std::endl;
return true;
}
bool GeneratorImpl::EmitLoop(ast::LoopStatement* stmt) {
make_indent();
out_ << "loop {" << std::endl;
increment_indent();
for (auto* s : *(stmt->body())) {
if (!EmitStatement(s)) {
return false;
}
}
if (stmt->has_continuing()) {
out_ << std::endl;
make_indent();
out_ << "continuing ";
if (!EmitBlockAndNewline(stmt->continuing())) {
return false;
}
}
decrement_indent();
make_indent();
out_ << "}" << std::endl;
return true;
}
bool GeneratorImpl::EmitReturn(ast::ReturnStatement* stmt) {
make_indent();
out_ << "return";
if (stmt->has_value()) {
out_ << " ";
if (!EmitExpression(stmt->value())) {
return false;
}
}
out_ << ";" << std::endl;
return true;
}
bool GeneratorImpl::EmitSwitch(ast::SwitchStatement* stmt) {
make_indent();
out_ << "switch(";
if (!EmitExpression(stmt->condition())) {
return false;
}
out_ << ") {" << std::endl;
increment_indent();
for (auto* s : stmt->body()) {
if (!EmitCase(s)) {
return false;
}
}
decrement_indent();
make_indent();
out_ << "}" << std::endl;
return true;
}
} // namespace wgsl
} // namespace writer
} // namespace tint