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Fix the (0,0) edge case in the atan2s offset lookup table (#576)

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John S 2024-12-19 20:15:16 -05:00 • committed by GitHub
parent 875a1f975e
commit 096a5f8dbd
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1 changed files with 4 additions and 1 deletions
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src/engine/math_util.c
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@ -849,8 +849,11 @@ inline s16 atan2s(f32 y, f32 x) {
static const s16 offsets[] = {0x4000, 0x4000, 0xC000, 0xC000, 0x0000, 0x8000, 0x0000, 0x8000}; static const s16 offsets[] = {0x4000, 0x4000, 0xC000, 0xC000, 0x0000, 0x8000, 0x0000, 0x8000};
static const s8 signs[] = {-1, 1, 1, -1, 1, -1, -1, 1}; static const s8 signs[] = {-1, 1, 1, -1, 1, -1, -1, 1};
// Adjust output for (0, 0) edge case
s16 zeroAdj = (x == 0.0f && y == 0.0f) * -0x4000;
// Ensure the result fits into 16 bits via an explicit cast on angle // Ensure the result fits into 16 bits via an explicit cast on angle
return (offsets[idx] + (signs[idx] * (s16)angle)) & 0xFFFF; return ((offsets[idx] + (signs[idx] * (s16)angle)) + zeroAdj) & 0xFFFF;
} }
/** /**