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[hlsl-writer] Emit specialization variables 

This CL adds specialization to the HLSL backend. The specialization is
emulated using defined preprocessor macros.

Bug: tint:154
Change-Id: I73ab42360558967eee9a0da6bbe74d513fe4cc57
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/29720
Commit-Queue: David Neto <dneto@google.com>
Reviewed-by: David Neto <dneto@google.com>
This commit is contained in:
dan sinclair 2020-10-08 16:22:45 +00:00 committed by Commit Bot service account
parent 66377ce9be
commit fc5c5ab60b
2 changed files with 80 additions and 10 deletions
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44
src/writer/hlsl/generator_impl.cc
View File

@ -2053,7 +2053,7 @@ bool GeneratorImpl::EmitProgramConstVariable(std::ostream& out,
const ast::Variable* var) {
make_indent(out);
if (var->IsDecorated()) {
if (var->IsDecorated() && !var->AsDecorated()->HasConstantIdDecoration()) {
error_ = "Decorated const values not valid";
return false;
}
@ -2064,8 +2064,6 @@ bool GeneratorImpl::EmitProgramConstVariable(std::ostream& out,
std::ostringstream constructor_out;
if (var->constructor() != nullptr) {
constructor_out << " = ";
std::ostringstream pre;
if (!EmitExpression(pre, constructor_out, var->constructor())) {
return false;
@ -2073,14 +2071,40 @@ bool GeneratorImpl::EmitProgramConstVariable(std::ostream& out,
out << pre.str();
}
out << "static const ";
if (!EmitType(out, var->type(), var->name())) {
return false;
if (var->IsDecorated() && var->AsDecorated()->HasConstantIdDecoration()) {
auto const_id = var->AsDecorated()->constant_id();
out << "#ifndef WGSL_SPEC_CONSTANT_" << const_id << std::endl;
if (var->constructor() != nullptr) {
out << "#define WGSL_SPEC_CONSTANT_" << const_id << " "
<< constructor_out.str() << std::endl;
} else {
out << "#error spec constant required for constant id " << const_id
<< std::endl;
}
out << "#endif" << std::endl;
out << "static const ";
if (!EmitType(out, var->type(), var->name())) {
return false;
}
out << " " << var->name() << " = WGSL_SPEC_CONSTANT_" << const_id << ";"
<< std::endl;
out << "#undef WGSL_SPEC_CONSTANT_" << const_id << std::endl;
} else {
out << "static const ";
if (!EmitType(out, var->type(), var->name())) {
return false;
}
if (!var->type()->IsArray()) {
out << " " << var->name();
}
if (var->constructor() != nullptr) {
out << " = " << constructor_out.str();
}
out << ";" << std::endl;
}
if (!var->type()->IsArray()) {
out << " " << var->name();
}
out << constructor_out.str() << ";" << std::endl;
return true;
}

46
src/writer/hlsl/generator_impl_module_constant_test.cc
View File

@ -15,6 +15,8 @@
#include <memory>
#include <vector>
#include "src/ast/constant_id_decoration.h"
#include "src/ast/decorated_variable.h"
#include "src/ast/float_literal.h"
#include "src/ast/module.h"
#include "src/ast/scalar_constructor_expression.h"
@ -56,6 +58,50 @@ TEST_F(HlslGeneratorImplTest_ModuleConstant, Emit_ModuleConstant) {
"static const float pos[3] = {1.00000000f, 2.00000000f, 3.00000000f};\n");
}
TEST_F(HlslGeneratorImplTest_ModuleConstant, Emit_SpecConstant) {
ast::type::F32Type f32;
ast::VariableDecorationList decos;
decos.push_back(std::make_unique<ast::ConstantIdDecoration>(23));
auto var = std::make_unique<ast::DecoratedVariable>(
std::make_unique<ast::Variable>("pos", ast::StorageClass::kNone, &f32));
var->set_decorations(std::move(decos));
var->set_is_const(true);
var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));
ASSERT_TRUE(gen().EmitProgramConstVariable(out(), var.get()))
<< gen().error();
EXPECT_EQ(result(), R"(#ifndef WGSL_SPEC_CONSTANT_23
#define WGSL_SPEC_CONSTANT_23 3.00000000f
#endif
static const float pos = WGSL_SPEC_CONSTANT_23;
#undef WGSL_SPEC_CONSTANT_23
)");
}
TEST_F(HlslGeneratorImplTest_ModuleConstant, Emit_SpecConstant_NoConstructor) {
ast::type::F32Type f32;
ast::VariableDecorationList decos;
decos.push_back(std::make_unique<ast::ConstantIdDecoration>(23));
auto var = std::make_unique<ast::DecoratedVariable>(
std::make_unique<ast::Variable>("pos", ast::StorageClass::kNone, &f32));
var->set_decorations(std::move(decos));
var->set_is_const(true);
ASSERT_TRUE(gen().EmitProgramConstVariable(out(), var.get()))
<< gen().error();
EXPECT_EQ(result(), R"(#ifndef WGSL_SPEC_CONSTANT_23
#error spec constant required for constant id 23
#endif
static const float pos = WGSL_SPEC_CONSTANT_23;
#undef WGSL_SPEC_CONSTANT_23
)");
}
} // namespace
} // namespace hlsl
} // namespace writer