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Merge pull request #1661 from 86Box/tc1995

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Fix the dword mode fix in the S3 code.
This commit is contained in:
Miran Grča
2021-09-05 20:31:03 +02:00
committed by GitHub
parent 6536a04590 e37f477ebf
commit 0de3c10341
1 changed files with 11 additions and 7 deletions
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18
src/video/vid_s3.c
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@@ -2711,10 +2711,12 @@ static void s3_recalctimings(svga_t *svga)
svga->lowres = !((svga->gdcreg[5] & 0x40) && (svga->crtc[0x3a] & 0x10));
if (((svga->gdcreg[5] & 0x40) && (svga->crtc[0x3a] & 0x10)) || (svga->crtc[0x3a] & 0x10)) {
if (svga->crtc[0x31] & 0x08) { /*If the dword mode bit is not enabled when the S3 dword mode is enabled, enable it*/
if (!(svga->crtc[0x14] & 0x40))
svga->crtc[0x14] |= 0x40;
}
if (svga->crtc[0x31] & 0x08) {
if (!(svga->crtc[0x17] & 0x40) && (svga->crtc[0x14] & 0x40)) /*Disable dword mode addressing when CRTC14 bit 6 is not enabled, regardless of the S3 dword mode bit.*/
svga->force_dword_mode = 1;
} else
svga->force_dword_mode = 0;
switch (svga->bpp) {
case 8:
svga->render = svga_render_8bpp_highres;
@@ -2852,9 +2854,11 @@ static void s3_trio64v_recalctimings(svga_t *svga)
svga->lowres = !((svga->gdcreg[5] & 0x40) && (svga->crtc[0x3a] & 0x10));
if ((svga->gdcreg[5] & 0x40) && (svga->crtc[0x3a] & 0x10)) {
if (svga->crtc[0x31] & 0x08) {
if (!(svga->crtc[0x14] & 0x40))
svga->crtc[0x14] |= 0x40;
}
if (!(svga->crtc[0x17] & 0x40) && (svga->crtc[0x14] & 0x40)) /*Disable dword mode addressing when CRTC14 bit 6 is not enabled, regardless of the S3 dword mode bit.*/
svga->force_dword_mode = 1;
} else
svga->force_dword_mode = 0;
switch (svga->bpp) {
case 8:
svga->render = svga_render_8bpp_highres;