Mercurial > repos > blastem
diff vdp.c @ 494:8ac0eb05642c
Initial implementation of sprite overflow and sprite collision status register flags
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Mon, 07 Oct 2013 10:02:08 -0700 |
| parents | 1f3450d1129f |
| children | 27345a67225d |
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--- a/vdp.c Fri Oct 04 20:16:18 2013 -0700 +++ b/vdp.c Mon Oct 07 10:02:08 2013 -0700 @@ -156,10 +156,16 @@ context->cur_slot--; for (uint16_t address = d->address; address != ((d->address+4) & 0xFFFF); address++) { if (x >= 0 && x < 320 && !(context->linebuf[x] & 0xF)) { + if (context->linebuf[x] && (context->vdpmem[address] >> 4)) { + context->flags2 |= FLAG2_SPRITE_COLLIDE; + } context->linebuf[x] = (context->vdpmem[address] >> 4) | d->pal_priority; } x += dir; if (x >= 0 && x < 320 && !(context->linebuf[x] & 0xF)) { + if (context->linebuf[x] && (context->vdpmem[address] & 0xF)) { + context->flags2 |= FLAG2_SPRITE_COLLIDE; + } context->linebuf[x] = (context->vdpmem[address] & 0xF) | d->pal_priority; } x += dir; @@ -1539,6 +1545,14 @@ if (context->flags2 & FLAG2_VINT_PENDING) { value |= 0x80; } + if (context->flags & FLAG_DOT_OFLOW) { + value |= 0x40; + } + if (context->flags2 & FLAG2_SPRITE_COLLIDE) { + value |= 0x20; + //TODO: Test when this is actually cleared + context->flags2 &= ~FLAG2_SPRITE_COLLIDE; + } if ((context->regs[REG_MODE_4] & BIT_INTERLACE) && context->framebuf == context->oddbuf) { value |= 0x10; } @@ -1557,7 +1571,6 @@ value |= 0x1; } //printf("status read at cycle %d returned %X\n", context->cycles, value); - //TODO: Sprite overflow, sprite collision, odd frame flag return value; }