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fix(ppu): properly access Mode 4 palette

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-10 07:23:54 -04:00
parent 22b95b2a74
commit fd5006b29d
1 changed files with 3 additions and 5 deletions
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8
src/ppu.zig
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@ -53,18 +53,16 @@ pub const Ppu = struct {
const frame_select = io.dispcnt.frame_select.read();
const fb_start = buf_pitch * @as(usize, scanline);
const vram_start = width * @as(usize, scanline);
const vram_start = fb_start >> 1;
const start = if (frame_select) 0xA000 + vram_start else vram_start;
const end = start + width;
for (self.vram.buf[start..end]) |byte, i| {
const fb_i = i * @sizeOf(u16);
const colour = self.palette.buf[byte];
var bgr555: u16 = colour & 0x3 | (colour & 0x1C >> 2) << 5 | @as(u16, colour >> 5) << 10;
self.frame_buf[fb_start + fb_i + 1] = @truncate(u8, bgr555 >> 8);
self.frame_buf[fb_start + fb_i] = @truncate(u8, bgr555);
self.frame_buf[fb_start + fb_i + 1] = self.palette.buf[byte + 1];
self.frame_buf[fb_start + fb_i] = self.palette.buf[byte];
}
},
else => std.debug.panic("[PPU] TODO: Implement BG Mode {}", .{bg_mode}),