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Another attempt at improving the S3 linear framebuffer.

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This commit is contained in:
OBattler
2016-11-05 04:56:17 +01:00
parent 5702a34b3b
commit 0e3990aa29
1 changed files with 20 additions and 9 deletions
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29
src/vid_s3.c
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@@ -1055,6 +1055,7 @@ void s3_recalctimings(svga_t *svga)
void s3_updatemapping(s3_t *s3)
{
svga_t *svga = &s3->svga;
uint32_t lbase;
// video_write_a000_w = video_write_a000_l = NULL;
@@ -1124,20 +1125,30 @@ void s3_updatemapping(s3_t *s3)
}
s3->linear_base &= ~(s3->linear_size - 1);
#endif
svga->linear_base = s3->linear_base;
// pclog("%08X %08X %02X %02X %02X\n", linear_base, linear_size, crtc[0x58], crtc[0x59], crtc[0x5a]);
// pclog("Linear framebuffer at %08X size %08X\n", s3->linear_base, s3->linear_size);
#if 0
if (s3->linear_base & 0xe0000000)
if ((svga->crtc[0x68] & 0x80) && (s3->chip != S3_TRIO32))
{
/* If bits 31-29 are not all clear, disable linear base. */
mem_mapping_disable(&s3->linear_mapping);
return;
if (s3->linear_base & 0xe0000000)
{
/* If bits 31-29 are not all clear, disable linear base. */
mem_mapping_disable(&s3->linear_mapping);
return;
}
else
{
lbase = s3->linear_base & 0x1fffffff;
}
}
else
{
lbase = s3->linear_base;
}
#endif
if (s3->linear_base == 0xa0000)
svga->linear_base = lbase;
if (lbase == 0xa0000)
{
mem_mapping_disable(&s3->linear_mapping);
if (!(svga->crtc[0x53] & 0x10))
@@ -1148,7 +1159,7 @@ void s3_updatemapping(s3_t *s3)
// mem_mapping_set_addr(&s3->linear_mapping, 0xa0000, 0x10000);
}
else
mem_mapping_set_addr(&s3->linear_mapping, s3->linear_base, s3->linear_size);
mem_mapping_set_addr(&s3->linear_mapping, lbase, s3->linear_size);
}
else
mem_mapping_disable(&s3->linear_mapping);