Mercurial > repos > blastem
diff vdp.c @ 2013:dcdad92f84a4
Multiplying by zero and shifting by zero are very different. Fixes regression in Overdrive 2
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 01 Nov 2020 13:28:31 -0800 |
parents | 19957e7353a4 |
children | bcc85f6b06c2 |
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--- a/vdp.c Sun Nov 01 12:35:58 2020 -0800 +++ b/vdp.c Sun Nov 01 13:28:31 2020 -0800 @@ -1160,7 +1160,7 @@ vscroll >>= vscroll_shift; //TODO: Verify the behavior for a setting of 2 static const uint16_t hscroll_masks[] = {0x1F, 0x3F, 0x1F, 0x7F}; - static const uint16_t v_shifts[] = {6, 7, 0, 8}; + static const uint16_t v_shifts[] = {6, 7, 16, 8}; uint16_t hscroll_mask = hscroll_masks[context->regs[REG_SCROLL] & 0x3]; uint16_t v_shift = v_shifts[context->regs[REG_SCROLL] & 0x3]; uint16_t hscroll, offset;