80486DX2-66/86Box-fork
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Fixed the SVGA/MMIO under Win3.1/NT and added more documentation.

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This commit is contained in:
TC1995
2020-06-26 00:41:52 +02:00
parent 936462910c
commit c0891644f7
1 changed files with 14 additions and 10 deletions
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24
src/video/vid_s3.c
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@@ -647,7 +647,9 @@ static void s3_accel_out_fifo(s3_t *s3, uint16_t port, uint8_t val)
if (s3_cpu_dest(s3))
break;
s3->accel.pix_trans[0] = val;
if ((s3->accel.multifunc[0xa] & 0xc0) == 0x80 && !(s3->accel.cmd & 0x600) && (s3->accel.cmd & 0x100))
/*Check to see if there's actual data from CPU*/
if ((s3->accel.multifunc[0xa] & 0xc0) == 0x80 && !(s3->accel.cmd & 0x600) && (s3->accel.cmd & 0x100) &&
(((s3->accel.frgd_mix & 0x60) != 0x40) || ((s3->accel.bkgd_mix & 0x60) != 0x40)))
s3_accel_start(8, 1, s3->accel.pix_trans[0], 0, s3);
else if (!(s3->accel.cmd & 0x600) && (s3->accel.cmd & 0x100))
s3_accel_start(1, 1, 0xffffffff, s3->accel.pix_trans[0], s3);
@@ -656,7 +658,9 @@ static void s3_accel_out_fifo(s3_t *s3, uint16_t port, uint8_t val)
if (s3_cpu_dest(s3))
break;
s3->accel.pix_trans[1] = val;
if ((s3->accel.multifunc[0xa] & 0xc0) == 0x80 && (s3->accel.cmd & 0x600) == 0x200 && (s3->accel.cmd & 0x100))
/*Check to see if there's actual data from CPU*/
if ((s3->accel.multifunc[0xa] & 0xc0) == 0x80 && (s3->accel.cmd & 0x600) == 0x200 && (s3->accel.cmd & 0x100) &&
&& (((s3->accel.frgd_mix & 0x60) != 0x40) || ((s3->accel.bkgd_mix & 0x60) != 0x40)))
{
if (s3->accel.cmd & 0x1000) s3_accel_start(16, 1, s3->accel.pix_trans[1] | (s3->accel.pix_trans[0] << 8), 0, s3);
else s3_accel_start(16, 1, s3->accel.pix_trans[0] | (s3->accel.pix_trans[1] << 8), 0, s3);
@@ -695,7 +699,9 @@ static void s3_accel_out_fifo_w(s3_t *s3, uint16_t port, uint16_t val)
{
if (s3->accel.cmd & 0x100)
{
if ((s3->accel.multifunc[0xa] & 0xc0) == 0x80 && (s3->chip != S3_86C911))
/*Check to see if there's actual data from CPU*/
if ((s3->accel.multifunc[0xa] & 0xc0) == 0x80 &&
(((s3->accel.frgd_mix & 0x60) != 0x40) || ((s3->accel.bkgd_mix & 0x60) != 0x40)))
{
if (s3->accel.cmd & 0x1000)
val = (val >> 8) | (val << 8);
@@ -1462,7 +1468,7 @@ void s3_out(uint16_t addr, uint8_t val, void *p)
case 0x53:
case 0x58: case 0x59: case 0x5a:
if (s3->chip != S3_86C911)
if (s3->chip != S3_86C911) /*S3 911/924 doesn't do MMIO*/
s3_updatemapping(s3);
break;
@@ -1738,7 +1744,7 @@ void s3_updatemapping(s3_t *s3)
s3->linear_size = 0x200000;
break;
case 3: /*8mb*/
switch (s3->chip) {
switch (s3->chip) { /* Not on video cards that don't support 4MB*/
case S3_TRIO64:
case S3_86C928:
s3->linear_size = 0x400000;
@@ -1768,10 +1774,8 @@ void s3_updatemapping(s3_t *s3)
/* Memory mapped I/O. */
if ((svga->crtc[0x53] & 0x10) || (s3->accel.advfunc_cntl & 0x20)) {
/* Old MMIO. */
if ((s3->chip == S3_86C801) || (s3->chip == S3_86C805) ||
(s3->chip == S3_86C928))
mem_mapping_disable(&svga->mapping);
mem_mapping_disable(&svga->mapping); /* This must stay otherwise we can get a big messup in most operating systems,
like missing backgrounds, etc.*/
mem_mapping_enable(&s3->mmio_mapping);
} else
mem_mapping_disable(&s3->mmio_mapping);
@@ -1838,7 +1842,7 @@ void s3_accel_out(uint16_t port, uint8_t val, void *p)
break;
case 0x4948: case 0x4ae8:
s3->accel.advfunc_cntl = val;
if (s3->chip != S3_86C911)
if (s3->chip != S3_86C911) /*S3 911/924 doesn't do MMIO*/
s3_updatemapping(s3);
break;
}