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fix: 8-bit writes to WIN PPU registers 

Advance Wars depends on these registers similar to Mario Kart's 8-bit
writes to Affine Background registers:
This commit is contained in:
Rekai Nyangadzayi Musuka 2022-08-08 14:41:48 +02:00 committed by Rekai Musuka
parent 03b2648f16
commit 91427aa920
1 changed files with 13 additions and 0 deletions
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13
src/core/bus/io.zig
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@ -424,8 +424,12 @@ pub const BldY = extern union {
raw: u16,
};
const u8WriteKind = enum { Hi, Lo };
/// Write-only
pub const WinH = extern union {
const Self = @This();
x2: Bitfield(u16, 0, 8),
x1: Bitfield(u16, 8, 8),
raw: u16,
@ -433,9 +437,18 @@ pub const WinH = extern union {
/// Write-only
pub const WinV = extern union {
const Self = @This();
y2: Bitfield(u16, 0, 8),
y1: Bitfield(u16, 8, 8),
raw: u16,
pub fn set(self: *Self, comptime K: u8WriteKind, value: u8) void {
self.raw = switch (K) {
.Hi => (@as(u16, value) << 8) | self.raw & 0xFF,
.Lo => (self.raw & 0xFF00) | value,
};
}
};
pub const WinIn = extern union {