src/dawn/tests/unittests/EnumMaskIteratorTests.cpp

// Copyright 2020 The Dawn & Tint Authors
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#include "dawn/native/EnumMaskIterator.h"

#include "gtest/gtest.h"

namespace dawn::native {

enum class TestAspect : uint8_t {
    Color = 1,
    Depth = 2,
    Stencil = 4,
};

template <>
struct EnumBitmaskSize<TestAspect> {
    static constexpr unsigned value = 3;
};

}  // namespace dawn::native

template <>
struct wgpu::IsWGPUBitmask<dawn::native::TestAspect> {
    static constexpr bool enable = true;
};

namespace dawn::native {

static_assert(EnumBitmaskSize<TestAspect>::value == 3);

TEST(EnumMaskIteratorTests, None) {
    for (TestAspect aspect : IterateEnumMask(static_cast<TestAspect>(0))) {
        FAIL();
        DAWN_UNUSED(aspect);
    }
}

TEST(EnumMaskIteratorTests, All) {
    TestAspect expected[] = {TestAspect::Color, TestAspect::Depth, TestAspect::Stencil};
    uint32_t i = 0;
    TestAspect aspects = TestAspect::Color | TestAspect::Depth | TestAspect::Stencil;
    for (TestAspect aspect : IterateEnumMask(aspects)) {
        EXPECT_EQ(aspect, expected[i++]);
    }
}

TEST(EnumMaskIteratorTests, Partial) {
    TestAspect expected[] = {TestAspect::Color, TestAspect::Stencil};
    uint32_t i = 0;
    TestAspect aspects = TestAspect::Stencil | TestAspect::Color;
    for (TestAspect aspect : IterateEnumMask(aspects)) {
        EXPECT_EQ(aspect, expected[i++]);
    }
}

}  // namespace dawn::native