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MGA: Implement BPLAN for BITBLT operations

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This commit is contained in:
Cacodemon345
2024-02-27 16:16:06 +06:00
committed by GitHub
parent 6aed2455bf
commit 0275ff3523
1 changed files with 86 additions and 0 deletions
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86
src/video/vid_mga.c
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@@ -315,6 +315,7 @@
#define DWGCTRL_TRANS_MASK (0xf << DWGCTRL_TRANS_SHIFT)
#define DWGCTRL_BLTMOD_MASK (0xf << 25)
#define DWGCTRL_BLTMOD_BMONOLEF (0x0 << 25)
#define DWGCTRL_BLTMOD_BPLAN (0x1 << 25)
#define DWGCTRL_BLTMOD_BFCOL (0x2 << 25)
#define DWGCTRL_BLTMOD_BU32BGR (0x3 << 25)
#define DWGCTRL_BLTMOD_BMONOWF (0x4 << 25)
@@ -5371,6 +5372,91 @@ blit_bitblt(mystique_t *mystique)
switch (mystique->dwgreg.dwgctrl_running & DWGCTRL_ATYPE_MASK) {
case DWGCTRL_ATYPE_BLK:
switch (mystique->dwgreg.dwgctrl_running & DWGCTRL_BLTMOD_MASK) {
/* TODO: This isn't exactly perfect. */
case DWGCTRL_BLTMOD_BPLAN:
if (mystique->dwgreg.dwgctrl_running & DWGCTRL_PATTERN)
fatal("BITBLT RPL/RSTR BPLAN with pattern\n");
src_addr = mystique->dwgreg.ar[3];
for (y = 0; y < mystique->dwgreg.length; y++) {
uint8_t const *const trans = &trans_masks[trans_sel][(mystique->dwgreg.selline & 3) * 4];
int16_t x = x_start;
while (1) {
uint32_t byte_addr = src_addr & mystique->vram_mask;
if (x >= mystique->dwgreg.cxleft && x <= mystique->dwgreg.cxright && mystique->dwgreg.ydst_lin >= mystique->dwgreg.ytop && mystique->dwgreg.ydst_lin <= mystique->dwgreg.ybot && ((svga->vram[byte_addr] & 1) || !(mystique->dwgreg.dwgctrl_running & DWGCTRL_TRANSC)) && trans[x & 3]) {
uint32_t src = (svga->vram[byte_addr] & 1) ? mystique->dwgreg.fcol : mystique->dwgreg.bcol;
uint32_t dst;
uint32_t old_dst;
switch (mystique->maccess_running & MACCESS_PWIDTH_MASK) {
case MACCESS_PWIDTH_8:
dst = svga->vram[(mystique->dwgreg.ydst_lin + x) & mystique->vram_mask];
dst = bitop(src, dst, mystique->dwgreg.dwgctrl_running);
svga->vram[(mystique->dwgreg.ydst_lin + x) & mystique->vram_mask] = dst;
svga->changedvram[((mystique->dwgreg.ydst_lin + x) & mystique->vram_mask) >> 12] = changeframecount;
break;
case MACCESS_PWIDTH_16:
dst = ((uint16_t *) svga->vram)[(mystique->dwgreg.ydst_lin + x) & mystique->vram_mask_w];
dst = bitop(src, dst, mystique->dwgreg.dwgctrl_running);
((uint16_t *) svga->vram)[(mystique->dwgreg.ydst_lin + x) & mystique->vram_mask_w] = dst;
svga->changedvram[((mystique->dwgreg.ydst_lin + x) & mystique->vram_mask_w) >> 11] = changeframecount;
break;
case MACCESS_PWIDTH_24:
old_dst = *(uint32_t *) &svga->vram[((mystique->dwgreg.ydst_lin + x) * 3) & mystique->vram_mask];
dst = bitop(src, old_dst, mystique->dwgreg.dwgctrl_running); // & DWGCTRL_BOP_MASK
*(uint32_t *) &svga->vram[((mystique->dwgreg.ydst_lin + x) * 3) & mystique->vram_mask] = (dst & 0xffffff) | (old_dst & 0xff000000);
svga->changedvram[(((mystique->dwgreg.ydst_lin + x) * 3) & mystique->vram_mask) >> 12] = changeframecount;
break;
case MACCESS_PWIDTH_32:
dst = ((uint32_t *) svga->vram)[(mystique->dwgreg.ydst_lin + x) & mystique->vram_mask_l];
dst = bitop(src, dst, mystique->dwgreg.dwgctrl_running);
((uint32_t *) svga->vram)[(mystique->dwgreg.ydst_lin + x) & mystique->vram_mask_l] = dst;
svga->changedvram[((mystique->dwgreg.ydst_lin + x) & mystique->vram_mask_l) >> 10] = changeframecount;
break;
default:
fatal("BITBLT RPL BPLAN PWIDTH %x %08x\n", mystique->maccess_running & MACCESS_PWIDTH_MASK, mystique->dwgreg.dwgctrl_running);
}
}
if (src_addr == mystique->dwgreg.ar[0]) {
mystique->dwgreg.ar[0] += mystique->dwgreg.ar[5];
mystique->dwgreg.ar[3] += mystique->dwgreg.ar[5];
src_addr = mystique->dwgreg.ar[3];
} else
src_addr += x_dir;
if (x != x_end) {
if ((x > x_end) && (x_dir == 1))
x--;
else if ((x < x_end) && (x_dir == -1))
x++;
else
x += x_dir;
} else
break;
}
if (mystique->dwgreg.sgn.sdy)
mystique->dwgreg.ydst_lin -= (mystique->dwgreg.pitch & PITCH_MASK);
else
mystique->dwgreg.ydst_lin += (mystique->dwgreg.pitch & PITCH_MASK);
}
break;
case DWGCTRL_BLTMOD_BMONOLEF:
case DWGCTRL_BLTMOD_BMONOWF:
src_addr = mystique->dwgreg.ar[3];