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Fixed (S)VGA video RAM masking, fixes Commander Keen 4 and 5;

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(S)VGA overscan is now only calculated from the row count if overscan is enabled.
This commit is contained in:
OBattler
2018-01-24 12:15:31 +01:00
parent 25a0860011
commit b24b1146f5
1 changed files with 12 additions and 10 deletions
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22
src/video/vid_svga.c
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@@ -11,7 +11,7 @@
* This is intended to be used by another SVGA driver,
* and not as a card in it's own right.
*
* Version: @(#)vid_svga.c 1.0.14 2018/01/21
* Version: @(#)vid_svga.c 1.0.15 2018/01/24
*
* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
* Miran Grca, <mgrca8@gmail.com>
@@ -596,14 +596,16 @@ void svga_recalctimings(svga_t *svga)
svga->linedbl = svga->crtc[9] & 0x80;
svga->rowcount = svga->crtc[9] & 31;
overscan_y = (svga->rowcount + 1) << 1;
if (svga->seqregs[1] & 8) /*Low res (320)*/
{
overscan_y <<= 1;
}
if (overscan_y < 16)
{
overscan_y = 16;
if (enable_overscan) {
overscan_y = (svga->rowcount + 1) << 1;
if (svga->seqregs[1] & 8) /*Low res (320)*/
{
overscan_y <<= 1;
}
if (overscan_y < 16)
{
overscan_y = 16;
}
}
/* pclog("SVGA row count: %i (scroll: %i)\n", svga->rowcount, svga->crtc[8] & 0x1f); */
if (svga->recalctimings_ex)
@@ -643,7 +645,7 @@ uint32_t svga_mask_addr(uint32_t addr, svga_t *svga)
{
limit_shift = 1;
}
return addr % (svga->vram_display_mask >> limit_shift);
return addr & (svga->vram_display_mask >> limit_shift);
}
uint32_t svga_mask_changedaddr(uint32_t addr, svga_t *svga)