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(S)VGA: Recalculate pel panning on every line instead of on every frame.

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This commit is contained in:
OBattler
2025-06-30 00:36:00 +02:00
parent ad5aa6e52f
commit d8669a5227
2 changed files with 31 additions and 23 deletions
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1
src/include/86box/vid_svga.h
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@@ -137,6 +137,7 @@ typedef struct svga_t {
int ps_bit_bug;
int ati_4color;
int vblankend;
int panning_blank;
/*The three variables below allow us to implement memory maps like that seen on a 1MB Trio64 :
0MB-1MB - VRAM

53
src/video/vid_svga.c
View File

@@ -1435,10 +1435,8 @@ svga_poll(void *priv)
svga->memaddr_backup = (svga->memaddr_backup << 2);
svga->scanline = 0;
if (svga->attrregs[0x10] & 0x20) {
svga->scrollcache = 0;
svga->x_add = svga->left_overscan;
}
if (svga->attrregs[0x10] & 0x20)
svga->panning_blank = 1;
}
}
if (svga->vc == svga->dispend) {
@@ -1526,25 +1524,6 @@ svga_poll(void *priv)
svga->dispon = 1;
svga->displine = (svga->interlace && svga->oddeven) ? 1 : 0;
svga->scrollcache = (svga->attrregs[0x13] & 0x0f);
if (!(svga->gdcreg[6] & 1) && !(svga->attrregs[0x10] & 1)) { /*Text mode*/
if (svga->seqregs[1] & 1)
svga->scrollcache &= 0x07;
else {
svga->scrollcache++;
if (svga->scrollcache > 8)
svga->scrollcache = 0;
}
} else if ((svga->render == svga_render_2bpp_lowres) || (svga->render == svga_render_2bpp_highres) || (svga->render == svga_render_4bpp_lowres) || (svga->render == svga_render_4bpp_highres))
svga->scrollcache &= 0x07;
else
svga->scrollcache = (svga->scrollcache & 0x06) >> 1;
if ((svga->seqregs[1] & 8) || (svga->render == svga_render_8bpp_lowres))
svga->scrollcache <<= 1;
svga->x_add = svga->left_overscan - svga->scrollcache;
svga->linecountff = 0;
svga->hwcursor_on = 0;
@@ -1555,9 +1534,37 @@ svga_poll(void *priv)
svga->overlay_on = 0;
svga->overlay_latch = svga->overlay;
svga->panning_blank = 0;
}
if (svga->scanline == (svga->crtc[10] & 31))
svga->cursorvisible = 1;
if (svga->panning_blank) {
svga->scrollcache = 0;
svga->x_add = svga->left_overscan;
} else {
svga->scrollcache = (svga->attrregs[0x13] & 0x0f);
if (!(svga->gdcreg[6] & 1) && !(svga->attrregs[0x10] & 1)) { /*Text mode*/
if (svga->seqregs[1] & 1)
svga->scrollcache &= 0x07;
else {
svga->scrollcache++;
if (svga->scrollcache > 8)
svga->scrollcache = 0;
}
} else if ((svga->render == svga_render_2bpp_lowres) || (svga->render == svga_render_2bpp_highres) ||
(svga->render == svga_render_4bpp_lowres) || (svga->render == svga_render_4bpp_highres))
svga->scrollcache &= 0x07;
else
svga->scrollcache = (svga->scrollcache & 0x06) >> 1;
if ((svga->seqregs[1] & 8) || (svga->render == svga_render_8bpp_lowres))
svga->scrollcache <<= 1;
svga->x_add = svga->left_overscan - svga->scrollcache;
}
}
}