Mercurial > repos > blastem
diff vdp.c @ 1290:aa1a8eb5bb2b
Change handling of invalid scroll plane sizes. Fixes title and high score screens in The Incredible Hulk
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 19 Mar 2017 12:54:20 -0700 |
parents | 6ad59a62e656 |
children | da1ffc4026c4 |
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--- a/vdp.c Sun Mar 19 11:17:40 2017 -0700 +++ b/vdp.c Sun Mar 19 12:54:20 2017 -0700 @@ -998,23 +998,8 @@ } context->flags &= ~FLAG_WINDOW; } - uint16_t vscroll; - switch(context->regs[REG_SCROLL] & 0x30) - { - case 0: - vscroll = 0xFF; - break; - case 0x10: - vscroll = 0x1FF; - break; - case 0x20: - //TODO: Verify this behavior - vscroll = 0; - break; - case 0x30: - vscroll = 0x3FF; - break; - } + //TODO: Verify behavior for 0x20 case + uint16_t vscroll = 0xFF | (context->regs[REG_SCROLL] & 0x30) << 4; if (context->double_res) { vscroll <<= 1; vscroll |= 1; @@ -1057,7 +1042,7 @@ break; case 0x2: //TODO: Verify this behavior - hscroll_mask = 0; + hscroll_mask = 0x5F; v_mul = 0; break; case 0x3: