src/tint/lang/wgsl/resolver/primitive_index_extension_test.cc

// Copyright 2025 The Dawn & Tint Authors
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#include "gmock/gmock.h"
#include "src/tint/lang/wgsl/resolver/resolver.h"
#include "src/tint/lang/wgsl/resolver/resolver_helper_test.h"

namespace tint::resolver {

using namespace tint::core::fluent_types;     // NOLINT
using namespace tint::core::number_suffixes;  // NOLINT

namespace {

using ResolverPrimitiveIndexExtensionTest = ResolverTest;

TEST_F(ResolverPrimitiveIndexExtensionTest, UsePrimitiveIndexWithoutExtensionError) {
    Structure("Inputs",
              Vector{
                  Member("a", ty.u32(), Vector{Builtin(core::BuiltinValue::kPrimitiveIndex)}),
              });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(
        r()->error(),
        R"(error: use of '@builtin(primitive_index)' requires enabling extension 'primitive_index')");
}

TEST_F(ResolverPrimitiveIndexExtensionTest, UsePrimitiveIndexWithExtension) {
    Enable(wgsl::Extension::kPrimitiveIndex);
    Structure("Inputs",
              Vector{
                  Member("a", ty.u32(), Vector{Builtin(core::BuiltinValue::kPrimitiveIndex)}),
              });

    EXPECT_TRUE(r()->Resolve()) << r()->error();
}

TEST_F(ResolverPrimitiveIndexExtensionTest, PrimitiveIndexI32Error) {
    Enable(wgsl::Extension::kPrimitiveIndex);
    Structure("Inputs",
              Vector{
                  Member("a", ty.i32(), Vector{Builtin(core::BuiltinValue::kPrimitiveIndex)}),
              });

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(), "error: store type of '@builtin(primitive_index)' must be 'u32'");
}

TEST_F(ResolverPrimitiveIndexExtensionTest, PrimitiveIndexVertexShader) {
    Enable(wgsl::Extension::kPrimitiveIndex);
    Func("main",
         Vector{Param("pi", ty.u32(), Vector{Builtin(core::BuiltinValue::kPrimitiveIndex)})},
         ty.void_(), Empty, Vector{Stage(ast::PipelineStage::kVertex)});

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "error: '@builtin(primitive_index)' cannot be used for vertex shader input");
}

TEST_F(ResolverPrimitiveIndexExtensionTest, PrimitiveIndexFragmentShaderOutput) {
    Enable(wgsl::Extension::kPrimitiveIndex);

    Func("main", tint::Empty, ty.u32(),
         Vector{
             Return(Call<u32>()),
         },
         Vector{Stage(ast::PipelineStage::kFragment)},
         Vector{Builtin(Source{{1, 2}}, core::BuiltinValue::kPrimitiveIndex)});

    EXPECT_FALSE(r()->Resolve());
    EXPECT_EQ(r()->error(),
              "1:2 error: '@builtin(primitive_index)' cannot be used for fragment shader output");
}

}  // namespace
}  // namespace tint::resolver