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Simplify some C++ abstractions (#1518)

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* Remove namespaces
* Prefer `bool operator==`, not `friend auto operator==`
* Prefer not to use `using`
* Use a `constexpr` function instead of a template for `flipTable`
This commit is contained in:
Sylvie
2024-09-26 00:07:27 -04:00
committed by GitHub
parent 8037b9e10a
commit 9783671399
11 changed files with 80 additions and 124 deletions
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20
include/gfx/main.hpp
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@@ -107,20 +107,18 @@ struct Palette {
uint8_t size() const;
};
namespace detail {
template<typename T, T... i>
static constexpr auto flipTable(std::integer_sequence<T, i...>) {
return std::array{[](uint8_t byte) {
// Flipping tends to happen fairly often, so take a bite out of dcache to speed it up
static constexpr auto flipTable = ([]() constexpr {
std::array<uint16_t, 256> table{};
for (uint16_t i = 0; i < table.size(); i++) {
// To flip all the bits, we'll flip both nibbles, then each nibble half, etc.
uint16_t byte = i;
byte = (byte & 0b0000'1111) << 4 | (byte & 0b1111'0000) >> 4;
byte = (byte & 0b0011'0011) << 2 | (byte & 0b1100'1100) >> 2;
byte = (byte & 0b0101'0101) << 1 | (byte & 0b1010'1010) >> 1;
return byte;
}(i)...};
}
} // namespace detail
// Flipping tends to happen fairly often, so take a bite out of dcache to speed it up
static constexpr auto flipTable = detail::flipTable(std::make_integer_sequence<uint16_t, 256>());
table[i] = byte;
}
return table;
})();
#endif // RGBDS_GFX_MAIN_HPP