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(S)VGA: Implement some level of pel shift memorization.

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This commit is contained in:
OBattler
2025-09-09 21:50:49 +02:00
parent 51c2328949
commit e630a8fa25
1 changed files with 25 additions and 13 deletions
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38
src/video/vid_svga_render.c
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@@ -243,7 +243,7 @@ svga_render_text_80(svga_t *svga)
p = &svga->monitor->target_buffer->line[svga->displine + svga->y_add][svga->x_add];
xinc = (svga->seqregs[1] & 1) ? 8 : 9;
uint32_t col = 0x00000000;
static uint32_t col = 0x00000000;
for (int x = 0; x < (svga->hdisp + svga->scrollcache); x += xinc) {
if (!svga->force_old_addr)
@@ -312,19 +312,21 @@ svga_render_text_80(svga_t *svga)
}
}
} else {
fg = svga->pallook[svga->egapal[fg] & svga->dac_mask];
bg = svga->pallook[svga->egapal[bg] & svga->dac_mask];
if (svga->seqregs[1] & 1) {
for (xx = 0; xx < 8; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
for (xx = 0; xx < 8; xx++) {
col = (col << 4) | ((dat & (0x80 >> xx)) ? fg : bg);
p[xx] = svga->pallook[svga->egapal[col & 0x0f] & svga->dac_mask];
}
} else {
for (xx = 0; xx < 8; xx++)
p[xx] = (dat & (0x80 >> xx)) ? fg : bg;
for (xx = 0; xx < 8; xx++) {
col = (col << 4) | ((dat & (0x80 >> xx)) ? fg : bg);
p[xx] = svga->pallook[svga->egapal[col & 0x0f] & svga->dac_mask];
}
if ((chr & ~0x1F) != 0xC0 || !(svga->attrregs[0x10] & 4))
p[8] = bg;
col = (col << 4) | bg;
else
p[8] = (dat & 1) ? fg : bg;
col = (col << 4) | ((dat & 1) ? fg : bg);
p[8] = svga->pallook[svga->egapal[col & 0x0f] & svga->dac_mask];
}
}
@@ -805,8 +807,8 @@ svga_render_indexed_gfx(svga_t *svga, bool highres, bool combine8bits)
uint32_t incr_counter = 0;
uint32_t load_counter = 0;
uint32_t edat = 0;
uint32_t col = 0;
uint32_t col2 = 0;
static uint32_t col = 0;
static uint32_t col2 = 0;
for (x = 0; x <= (svga->hdisp + svga->scrollcache); x += charwidth) {
if (load_counter == 0) {
/* Find our address */
@@ -928,6 +930,7 @@ svga_render_indexed_gfx(svga_t *svga, bool highres, bool combine8bits)
uint32_t p0;
uint32_t p1;
if (svga->half_pixel) {
col &= 0xf0;
col |= (c0 >> 4) & 0xff;
col2 = (c0 << 4) & 0xff;
col2 |= (c1 >> 4) & 0xff;
@@ -937,6 +940,7 @@ svga_render_indexed_gfx(svga_t *svga, bool highres, bool combine8bits)
} else {
p0 = svga->map8[c0 & svga->dac_mask];
p1 = svga->map8[c1 & svga->dac_mask];
col = p1;
}
const int outoffs = i << dwshift;
for (int subx = 0; subx < dotwidth; subx++)
@@ -947,11 +951,14 @@ svga_render_indexed_gfx(svga_t *svga, bool highres, bool combine8bits)
uint32_t ccombined = (c0 << 4) | c1;
uint32_t p0;
if (svga->half_pixel) {
col &= 0xf0;
col |= (ccombined >> 4) & 0xff;
p0 = svga->map8[col & svga->dac_mask];
col = (ccombined << 4) & 0xff;
} else
} else {
p0 = svga->map8[ccombined & svga->dac_mask];
col = p0;
}
const int outoffs = (i >> 1) << dwshift;
for (int subx = 0; subx < dotwidth; subx++)
p[outoffs + subx] = p0;
@@ -964,6 +971,11 @@ svga_render_indexed_gfx(svga_t *svga, bool highres, bool combine8bits)
p[outoffs + subx] = p0;
for (int subx = 0; subx < dotwidth; subx++)
p[outoffs + subx + dotwidth] = p1;
if ((x + i - svga->scrollcache) & 0x01)
/* The lower 4 bits are undefined at this point. */
col = c1 << 4;
else
col = (c0 << 4) | c1;
}
}