Mercurial > repos > blastem
changeset 31:25016576b5f3
Make horizontal scrolling closer to correct, Comix Zone looks good, Sonic 2 slightly off
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 08 Dec 2012 20:25:56 -0800 |
| parents | 03f9bb57cc54 |
| children | 8602ad493794 |
| files | vdp.c |
| diffstat | 1 files changed, 1 insertions(+), 1 deletions(-) [+] |
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--- a/vdp.c Sat Dec 08 20:02:10 2012 -0800 +++ b/vdp.c Sat Dec 08 20:25:56 2012 -0800 @@ -180,7 +180,7 @@ } uint16_t hscroll, offset; for (int i = 0; i < 2; i++) { - hscroll = (hscroll_val + (column + i) * 8) & hscroll_mask; + hscroll = ((column - 2 + i) * 8 - hscroll_val) & hscroll_mask; offset = address + ((vscroll * v_mul + hscroll/4) & 0x1FFF); //printf("%s | line: %d, col: %d, x: %d, hs_mask %X, v_mul: %d, scr reg: %X, tbl addr: %X\n", (vsram_off ? "B" : "A"), line, (column-(2-i)), hscroll, hscroll_mask, v_mul, context->regs[REG_SCROLL], offset); uint16_t col_val = (context->vdpmem[offset] << 8) | context->vdpmem[offset+1];