Mercurial > repos > blastem
diff vdp.c @ 25:4d0c20ad815a
Fix vertical scroll value for plane B
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Sat, 08 Dec 2012 16:16:18 -0800 |
| parents | 30ae73f96267 |
| children | a7c2b92d8056 |
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--- a/vdp.c Sat Dec 08 16:09:43 2012 -0800 +++ b/vdp.c Sat Dec 08 16:16:18 2012 -0800 @@ -129,7 +129,7 @@ //TODO: Implement me } -void read_map_scroll(uint16_t column, uint32_t line, uint16_t address, uint16_t hscroll_val, vdp_context * context) +void read_map_scroll(uint16_t column, uint16_t vsram_off, uint32_t line, uint16_t address, uint16_t hscroll_val, vdp_context * context) { uint16_t vscroll; switch(context->regs[REG_SCROLL] & 0x30) @@ -148,7 +148,7 @@ vscroll = 0x3FF; break; } - vscroll &= (context->vsram[context->regs[REG_MODE_3] & 0x4 ? column : 0] + line); + vscroll &= (context->vsram[(context->regs[REG_MODE_3] & 0x4 ? column : 0) + vsram_off] + line); context->v_offset = vscroll & 0x7; printf("BG | line %d, vsram: %d, vscroll: %d, v_offset: %d\n", line, context->vsram[context->regs[REG_MODE_3] & 0x4 ? column : 0], vscroll, context->v_offset); vscroll /= 8; @@ -185,12 +185,12 @@ void read_map_scroll_a(uint16_t column, uint32_t line, vdp_context * context) { - read_map_scroll(column, line, (context->regs[REG_SCROLL_A] & 0x38) << 10, context->hscroll_a, context); + read_map_scroll(column, 0, line, (context->regs[REG_SCROLL_A] & 0x38) << 10, context->hscroll_a, context); } void read_map_scroll_b(uint16_t column, uint32_t line, vdp_context * context) { - read_map_scroll(column, line, (context->regs[REG_SCROLL_B] & 0x7) << 13, context->hscroll_b, context); + read_map_scroll(column, 1, line, (context->regs[REG_SCROLL_B] & 0x7) << 13, context->hscroll_b, context); } void render_map(uint16_t col, uint8_t * tmp_buf, vdp_context * context)