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Mystique: Made the changes apply only to the Millennium.

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This commit is contained in:
OBattler
2023-12-23 15:27:08 +01:00
parent 0f8fde07ec
commit 708a700abd
1 changed files with 48 additions and 19 deletions
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67
src/video/vid_mga.c
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@@ -722,7 +722,31 @@ mystique_out(uint16_t addr, uint8_t val, void *priv)
if (mystique->crtcext_idx < 6)
mystique->crtcext_regs[mystique->crtcext_idx] = val;
if (mystique->crtcext_idx == 4) {
if ((mystique->type >= MGA_1064SG) && (mystique->crtcext_idx == 0) &&
(mystique->crtcext_regs[3] & CRTCX_R3_MGAMODE)) {
svga->rowoffset = svga->crtc[0x13] |
((mystique->crtcext_regs[0] & CRTCX_R0_OFFSET_MASK) << 4);
svga->rowoffset <<= 1;
svga->ma_latch = ((mystique->crtcext_regs[0] & CRTCX_R0_STARTADD_MASK) << 16) |
(svga->crtc[0xc] << 8) | svga->crtc[0xd];
if (mystique->pci_regs[0x41] & (OPTION_INTERLEAVE >> 8)) {
svga->rowoffset <<= 1;
svga->ma_latch <<= 1;
}
svga->ma_latch <<= 1;
if (svga->ma_latch != mystique->ma_latch_old) {
if (svga->interlace && svga->oddeven)
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) +
(svga->ma_latch << 2) + (svga->rowoffset << 1);
else
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) +
(svga->ma_latch << 2);
mystique->ma_latch_old = svga->ma_latch;
}
}
if (mystique->crtcext_idx == 4) {
if (svga->gdcreg[6] & 0xc) {
/*64k banks*/
svga->read_bank = (val & 0x7f) << 16;
@@ -817,21 +841,6 @@ mystique_vblank_start(svga_t *svga)
svga->ma_latch = ((mystique->crtcext_regs[0] & CRTCX_R0_STARTADD_MASK) << 16) | (svga->crtc[0xc] << 8) | svga->crtc[0xd];
if (mystique->pci_regs[0x41] & (OPTION_INTERLEAVE >> 8))
svga->ma_latch <<= 1;
if (mystique->type >= MGA_1064SG) {
/*Mystique, unlike most SVGA cards, allows display start to take
effect mid-screen*/
svga->ma_latch <<= 1;
/* Only change maback so the new display start will take effect on the next
horizontal retrace. */
if (svga->ma_latch != mystique->ma_latch_old) {
if (svga->interlace && svga->oddeven)
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2) + (svga->rowoffset << 1);
else
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) + (svga->ma_latch << 2);
mystique->ma_latch_old = svga->ma_latch;
}
}
}
}
@@ -906,10 +915,28 @@ mystique_recalctimings(svga_t *svga)
svga->hdisp_time = svga->hdisp;
svga->rowoffset = svga->crtc[0x13] | ((mystique->crtcext_regs[0] & CRTCX_R0_OFFSET_MASK) << 4);
if (mystique->pci_regs[0x41] & (OPTION_INTERLEAVE >> 8))
if (mystique->pci_regs[0x41] & (OPTION_INTERLEAVE >> 8)) {
svga->rowoffset <<= 1;
if (mystique->type >= MGA_1064SG)
svga->ma_latch <<= 1;
}
if (mystique->type >= MGA_1064SG) {
/*Mystique, unlike most SVGA cards, allows display start to take
effect mid-screen*/
svga->ma_latch <<= 1;
/* Only change maback so the new display start will take effect on the next
horizontal retrace. */
if (svga->ma_latch != mystique->ma_latch_old) {
if (svga->interlace && svga->oddeven)
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) +
(svga->ma_latch << 2) + (svga->rowoffset << 1);
else
svga->maback = (svga->maback - (mystique->ma_latch_old << 2)) +
(svga->ma_latch << 2);
mystique->ma_latch_old = svga->ma_latch;
}
svga->rowoffset <<= 1;
switch (mystique->xmulctrl & XMULCTRL_DEPTH_MASK) {
case XMULCTRL_DEPTH_8:
@@ -960,13 +987,15 @@ mystique_recalctimings(svga_t *svga)
}
svga->packed_chain4 = 1;
svga->line_compare = mystique_line_compare;
svga->vblank_start = mystique_vblank_start;
if (mystique->type < MGA_1064SG)
svga->vblank_start = mystique_vblank_start;
} else {
svga->packed_chain4 = 0;
svga->line_compare = NULL;
svga->vblank_start = NULL;
if (mystique->type >= MGA_1064SG)
svga->bpp = 8;
else
svga->vblank_start = NULL;
}
svga->fb_only = svga->packed_chain4;