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Implement first pass at hires draw

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Note: it's a hot mess
This commit is contained in:
Peter Evans 2018-03-14 00:57:50 -05:00
parent 68f9daf6ac
commit bff83bc315
1 changed files with 35 additions and 2 deletions
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37
src/apple2.hires.c
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@ -588,7 +588,7 @@ apple2_hires_row(size_t addr)
int
apple2_hires_col(size_t addr)
{
return apple2_text_col(addr);
return apple2_text_col((addr - 0x1600) % 0x400);
}
/*
@ -602,7 +602,40 @@ apple2_hires_draw(apple2 *mach, size_t addr)
int row = apple2_hires_row(addr),
col = apple2_hires_col(addr);
row = col;
if (row == -1 || col == -1) {
return;
}
// Each byte encodes 7 pixels, with the 8th bit reserved to choose
// the color palette.
col *= 7;
vm_8bit byte = mos6502_get(mach->cpu, addr);
vm_area area;
area.width = 1;
area.height = 1;
area.xoff = col;
area.yoff = row;
//printf("draw { w:%d, h:%d, xoff:%d, yoff:%d }\n", area.width, area.height, area.xoff, area.yoff);
for (int i = 0; i < 7; i++, area.xoff++) {
vm_8bit dot = byte >> i;
vm_8bit lsb = byte & 0x1;
vm_color clr = (byte & 0x80)
? COLOR_H1(byte >> i)
: COLOR_H0(byte >> i);
if (i > 0) {
if (clr.r == clr.g && clr.r == clr.b && clr.r == 0 && lsb) {
clr = COLOR_H1(3);
}
}
vm_screen_set_color(mach->screen, clr);
vm_screen_draw_rect(mach->screen, &area);
}
}
/*