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analog-firmware
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Video 7 F/B HiRes mode

This commit is contained in:
David Kuder 2023-05-02 16:19:35 -04:00
parent 138440b31b
commit 9c5804c33d
1 changed files with 32 additions and 0 deletions
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32
vga/render_hires.c
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@ -69,6 +69,38 @@ static void DELAYED_COPY_CODE(render_hires_line)(bool p2, uint line) {
dotc -= 2;
}
}
} else if((internal_flags & IFLAGS_VIDEO7) && (soft_switches & SOFTSW_80STORE)) {
const uint8_t *color_mem = (const uint8_t *)(hgr_p3) + hires_line_to_mem_offset(line);
uint16_t color_on, color_off;
// Video 7 F/B HiRes
while(i < 40) {
if(dotc == 0) {
dots |= (line_mem[i] & 0x7f) << dotc;
color_on = lores_palette[(color_mem[i] >> 4) & 0xF];
color_off = lores_palette[(color_mem[i] >> 0) & 0xF];
i++;
dotc += 7;
}
pixeldata = ((dots & 1) ? (color_on) : (color_off));
dots >>= 1;
dotc--;
if(dotc == 0) {
dots |= (line_mem[i] & 0x7f) << dotc;
color_on = lores_palette[(color_mem[i] >> 4) & 0xF];
color_off = lores_palette[(color_mem[i] >> 0) & 0xF];
i++;
dotc += 7;
}
pixeldata |= ((dots & 1) ? (color_on) : (color_off)) << 16;
dots >>= 1;
dotc--;
sl->data[sl_pos++] = pixeldata;
}
} else if(internal_flags & IFLAGS_OLDCOLOR) {
// Each hires byte contains 7 pixels which may be shifted right 1/2 a pixel. That is
// represented here by 14 'dots' to precisely describe the half-pixel positioning.