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| author | Thomas Voss <mail@thomasvoss.com> | 2024-02-17 08:48:09 +0100 |
|---|---|---|
| committer | Thomas Voss <mail@thomasvoss.com> | 2024-02-17 08:48:09 +0100 |
| commit | daf44bcdc706dd84bf291b207a8f720bc2b26159 (patch) | |
| tree | 423095b01f94258d3bb8884f7f158f630fa61b41 | |
| parent | d648d6fbe8bf984ea623bcdafc41d029e26a4cba (diff) | |
Fix DRW collision detection
| -rw-r--r-- | src/ahoy/emulator.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/ahoy/emulator.c b/src/ahoy/emulator.c index 980a0a7..04816cf 100644 --- a/src/ahoy/emulator.c +++ b/src/ahoy/emulator.c @@ -212,6 +212,7 @@ opexec(uint16_t op) unsigned y = (op & 0x00F0) >> 4; unsigned n = (op & 0x000F) >> 0; + c8.V[0xF] = 0; c8.needs_redraw = true; if (c8.I + n > lengthof(mem)) diex("%s: attempted to draw sprite beyond bounds of RAM", filename); @@ -224,7 +225,7 @@ opexec(uint16_t op) break; msk = ((uint64_t)spr_row << (64 - 8)) >> c8.V[x]; - c8.V[0xF] = (bool)(c8.screen[scr_row] & msk); + c8.V[0xF] |= (bool)(c8.screen[scr_row] & msk); c8.screen[scr_row] ^= msk; } |