80486DX2-66/86Box-fork
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S3 mode fixes 2 and one small accel cleanup:

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1. Fixed 16bpp modes (including 15-bit) of the Trio32/64 that were doubling their horizontal resolution.
2. Made Bresenham Line easier to work with.
This commit is contained in:
TC1995
2024-01-05 21:11:49 +01:00
parent 13d582b56f
commit 6b1d0b9e88
1 changed files with 74 additions and 124 deletions
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198
src/video/vid_s3.c
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@@ -3469,6 +3469,7 @@ s3_recalctimings(svga_t *svga)
if (svga->hdisp == 832)
svga->hdisp -= 32;
break;
case S3_ELSAWIN2KPROX:
switch (s3->width) {
case 1280:
@@ -3483,6 +3484,12 @@ s3_recalctimings(svga_t *svga)
break;
}
break;
case S3_TRIO64:
case S3_TRIO32:
svga->hdisp >>= 1;
break;
default:
break;
}
@@ -3636,6 +3643,7 @@ s3_recalctimings(svga_t *svga)
if (svga->hdisp == 832)
svga->hdisp -= 32;
break;
case S3_ELSAWIN2KPROX:
switch (s3->width) {
case 1280:
@@ -3650,6 +3658,12 @@ s3_recalctimings(svga_t *svga)
break;
}
break;
case S3_TRIO64:
case S3_TRIO32:
svga->hdisp >>= 1;
break;
default:
break;
}
@@ -3756,6 +3770,11 @@ s3_recalctimings(svga_t *svga)
}
break;
case S3_TRIO64:
case S3_TRIO32:
svga->hdisp /= 3;
break;
default:
break;
}
@@ -3834,6 +3853,7 @@ s3_recalctimings(svga_t *svga)
if (svga->hdisp == 832)
svga->hdisp -= 32;
break;
case S3_ELSAWIN2KPROX:
switch (s3->width) {
case 1280:
@@ -7222,71 +7242,36 @@ s3_911_accel_start(int count, int cpu_input, uint32_t mix_dat, uint32_t cpu_dat,
if (!s3->accel.sy)
break;
if (s3->accel.err_term >= s3->accel.maj_axis_pcnt) {
s3->accel.err_term += s3->accel.destx_distp;
/*Step minor axis*/
switch (s3->accel.cmd & 0xe0) {
case 0x00:
s3->accel.cy--;
break;
case 0x20:
s3->accel.cy--;
break;
case 0x40:
s3->accel.cx--;
break;
case 0x60:
s3->accel.cx++;
break;
case 0x80:
s3->accel.cy++;
break;
case 0xa0:
s3->accel.cy++;
break;
case 0xc0:
s3->accel.cx--;
break;
case 0xe0:
s3->accel.cx++;
break;
default:
break;
}
} else
s3->accel.err_term += s3->accel.desty_axstp;
/*Step major axis*/
switch (s3->accel.cmd & 0xe0) {
case 0x00:
s3->accel.cx--;
break;
case 0x20:
s3->accel.cx++;
break;
case 0x40:
s3->accel.cy--;
break;
case 0x60:
s3->accel.cy--;
break;
case 0x80:
s3->accel.cx--;
break;
case 0xa0:
s3->accel.cx++;
break;
case 0xc0:
if (s3->accel.cmd & 0x40) {
if (s3->accel.cmd & 0x80)
s3->accel.cy++;
break;
case 0xe0:
s3->accel.cy++;
break;
else
s3->accel.cy--;
default:
break;
if (s3->accel.err_term >= 0) {
s3->accel.err_term += s3->accel.destx_distp;
if (s3->accel.cmd & 0x20)
s3->accel.cx++;
else
s3->accel.cx--;
} else
s3->accel.err_term += s3->accel.desty_axstp;
} else {
if (s3->accel.cmd & 0x20)
s3->accel.cx++;
else
s3->accel.cx--;
if (s3->accel.err_term >= 0) {
s3->accel.err_term += s3->accel.destx_distp;
if (s3->accel.cmd & 0x80)
s3->accel.cy++;
else
s3->accel.cy--;
} else
s3->accel.err_term += s3->accel.desty_axstp;
}
s3->accel.sy--;
s3->accel.cx &= 0xfff;
s3->accel.cy &= 0xfff;
@@ -8028,71 +8013,36 @@ s3_accel_start(int count, int cpu_input, uint32_t mix_dat, uint32_t cpu_dat, voi
if (!s3->accel.sy)
break;
if (s3->accel.err_term >= s3->accel.maj_axis_pcnt) {
s3->accel.err_term += s3->accel.destx_distp;
/*Step minor axis*/
switch (s3->accel.cmd & 0xe0) {
case 0x00:
s3->accel.cy--;
break;
case 0x20:
s3->accel.cy--;
break;
case 0x40:
s3->accel.cx--;
break;
case 0x60:
s3->accel.cx++;
break;
case 0x80:
s3->accel.cy++;
break;
case 0xa0:
s3->accel.cy++;
break;
case 0xc0:
s3->accel.cx--;
break;
case 0xe0:
s3->accel.cx++;
break;
default:
break;
}
} else
s3->accel.err_term += s3->accel.desty_axstp;
/*Step major axis*/
switch (s3->accel.cmd & 0xe0) {
case 0x00:
s3->accel.cx--;
break;
case 0x20:
s3->accel.cx++;
break;
case 0x40:
s3->accel.cy--;
break;
case 0x60:
s3->accel.cy--;
break;
case 0x80:
s3->accel.cx--;
break;
case 0xa0:
s3->accel.cx++;
break;
case 0xc0:
if (s3->accel.cmd & 0x40) {
if (s3->accel.cmd & 0x80)
s3->accel.cy++;
break;
case 0xe0:
s3->accel.cy++;
break;
else
s3->accel.cy--;
default:
break;
if (s3->accel.err_term >= 0) {
s3->accel.err_term += s3->accel.destx_distp;
if (s3->accel.cmd & 0x20)
s3->accel.cx++;
else
s3->accel.cx--;
} else
s3->accel.err_term += s3->accel.desty_axstp;
} else {
if (s3->accel.cmd & 0x20)
s3->accel.cx++;
else
s3->accel.cx--;
if (s3->accel.err_term >= 0) {
s3->accel.err_term += s3->accel.destx_distp;
if (s3->accel.cmd & 0x80)
s3->accel.cy++;
else
s3->accel.cy--;
} else
s3->accel.err_term += s3->accel.desty_axstp;
}
s3->accel.sy--;
s3->accel.cx &= 0xfff;
s3->accel.cy &= 0xfff;