gbdev/rgbds
1
0
Fork 0
mirror of https://github.com/gbdev/rgbds.git synced 2025-11-20 10:12:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Move struct Palette into its own file (#1850)

Browse Source
This commit is contained in:
Rangi
2025-10-20 16:59:24 -04:00
committed by GitHub
parent 2873e0b8c8
commit 7462bccb72
11 changed files with 114 additions and 79 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
include/gfx/flip.hpp Normal file
View File

@@ -0,0 +1,23 @@
// SPDX-License-Identifier: MIT
#ifndef RGBDS_GFX_FLIP_HPP
#define RGBDS_GFX_FLIP_HPP
#include <array>
#include <stdint.h>
// Flipping tends to happen fairly often, so take a bite out of dcache to speed it up
static std::array<uint16_t, 256> 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;
table[i] = byte;
}
return table;
})();
#endif // RGBDS_GFX_FLIP_HPP