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feat: implement scrolling

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-02-16 03:37:25 -04:00
parent ce97a52868
commit d275a4890f
1 changed files with 9 additions and 4 deletions
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13
src/ppu.zig
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@ -86,10 +86,15 @@ pub const Ppu = struct {
const char_base: u32 = charblock_len * @as(u32, cbb);
const screen_base: u32 = screenblock_len * @as(u32, sbb);
const y = scanline;
const vofs = self.bg[n].vofs.offset.read();
const hofs = self.bg[n].hofs.offset.read();
const y = scanline + vofs;
var i: u32 = 0;
while (i < width) : (i += 1) {
const x = i + hofs;
var x: u32 = 0;
while (x < width) : (x += 1) {
// Grab the Screen Entry from VRAM
const entry_addr = screen_base + tilemapOffset(size, x, y);
const entry = @bitCast(ScreenEntry, @as(u16, self.vram.buf[entry_addr + 1]) << 8 | @as(u16, self.vram.buf[entry_addr]));
@ -115,7 +120,7 @@ pub const Ppu = struct {
break :blk pal_bank | tile;
} else tile;
std.mem.copy(u8, scanline_buf[x * 2 ..][0..2], self.palette.buf[colour * 2 ..][0..2]);
std.mem.copy(u8, scanline_buf[i * 2 ..][0..2], self.palette.buf[colour * 2 ..][0..2]);
}
std.mem.copy(u8, self.framebuf[start..][0..framebuf_pitch], &scanline_buf);