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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 <memory>
#include "gtest/gtest.h"
#include "src/ast/assignment_statement.h"
#include "src/ast/discard_statement.h"
#include "src/ast/float_literal.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/loop_statement.h"
#include "src/ast/module.h"
#include "src/ast/return_statement.h"
#include "src/ast/type/f32_type.h"
#include "src/ast/variable.h"
#include "src/ast/variable_decl_statement.h"
#include "src/writer/msl/generator_impl.h"
#include "src/writer/msl/test_helper.h"
namespace tint {
namespace writer {
namespace msl {
namespace {
using MslGeneratorImplTest = TestHelper;
TEST_F(MslGeneratorImplTest, Emit_Loop) {
auto* body = create<ast::BlockStatement>(ast::StatementList{
create<ast::DiscardStatement>(),
});
auto* l = create<ast::LoopStatement>(body, nullptr);
gen.increment_indent();
ASSERT_TRUE(gen.EmitStatement(l)) << gen.error();
EXPECT_EQ(gen.result(), R"( for(;;) {
discard_fragment();
}
)");
}
TEST_F(MslGeneratorImplTest, Emit_LoopWithContinuing) {
auto* body = create<ast::BlockStatement>(ast::StatementList{
create<ast::DiscardStatement>(),
});
auto* continuing = create<ast::BlockStatement>(ast::StatementList{
create<ast::ReturnStatement>(),
});
auto* l = create<ast::LoopStatement>(body, continuing);
gen.increment_indent();
ASSERT_TRUE(gen.EmitStatement(l)) << gen.error();
EXPECT_EQ(gen.result(), R"( {
bool tint_msl_is_first_1 = true;
for(;;) {
if (!tint_msl_is_first_1) {
return;
}
tint_msl_is_first_1 = false;
discard_fragment();
}
}
)");
}
TEST_F(MslGeneratorImplTest, Emit_LoopNestedWithContinuing) {
auto* body = create<ast::BlockStatement>(ast::StatementList{
create<ast::DiscardStatement>(),
});
auto* continuing = create<ast::BlockStatement>(ast::StatementList{
create<ast::ReturnStatement>(),
});
auto* inner = create<ast::LoopStatement>(body, continuing);
body = create<ast::BlockStatement>(ast::StatementList{
inner,
});
continuing = create<ast::BlockStatement>(ast::StatementList{
create<ast::AssignmentStatement>(Expr("lhs"), Expr("rhs")),
});
auto* outer = create<ast::LoopStatement>(body, continuing);
gen.increment_indent();
ASSERT_TRUE(gen.EmitStatement(outer)) << gen.error();
EXPECT_EQ(gen.result(), R"( {
bool tint_msl_is_first_1 = true;
for(;;) {
if (!tint_msl_is_first_1) {
lhs = rhs;
}
tint_msl_is_first_1 = false;
{
bool tint_msl_is_first_2 = true;
for(;;) {
if (!tint_msl_is_first_2) {
return;
}
tint_msl_is_first_2 = false;
discard_fragment();
}
}
}
}
)");
}
TEST_F(MslGeneratorImplTest, Emit_LoopWithVarUsedInContinuing) {
// loop {
// var lhs : f32 = 2.4;
// var other : f32;
// continuing {
// lhs = rhs
// }
// }
//
// ->
// {
// float lhs;
// float other;
// for (;;) {
// if (continuing) {
// lhs = rhs;
// }
// lhs = 2.4f;
// other = 0.0f;
// }
// }
auto* var = Var("lhs", ast::StorageClass::kFunction, ty.f32, Expr(2.4f),
ast::VariableDecorationList{});
auto* body = create<ast::BlockStatement>(
ast::StatementList{create<ast::VariableDeclStatement>(var),
create<ast::VariableDeclStatement>(Var(
"other", ast::StorageClass::kFunction, ty.f32))});
auto* continuing = create<ast::BlockStatement>(ast::StatementList{
create<ast::AssignmentStatement>(Expr("lhs"), Expr("rhs")),
});
gen.increment_indent();
auto* outer = create<ast::LoopStatement>(body, continuing);
ASSERT_TRUE(gen.EmitStatement(outer)) << gen.error();
EXPECT_EQ(gen.result(), R"( {
bool tint_msl_is_first_1 = true;
float lhs;
float other;
for(;;) {
if (!tint_msl_is_first_1) {
lhs = rhs;
}
tint_msl_is_first_1 = false;
lhs = 2.400000095f;
other = 0.0f;
}
}
)");
}
} // namespace
} // namespace msl
} // namespace writer
} // namespace tint