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fix: 8-bit writes to WIN PPU registers

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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 0bde97c6cd
commit b659c829fb
1 changed files with 28 additions and 0 deletions
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28
src/core/bus/io.zig
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@@ -302,6 +302,14 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_0009 => bus.ppu.bg[0].cnt.raw = (@as(u16, value) << 8) | (bus.ppu.bg[0].cnt.raw & 0xFF),
0x0400_000A => bus.ppu.bg[1].cnt.raw = (bus.ppu.bg[1].cnt.raw & 0xFF00) | value,
0x0400_000B => bus.ppu.bg[1].cnt.raw = (@as(u16, value) << 8) | (bus.ppu.bg[1].cnt.raw & 0xFF),
0x0400_0040 => bus.ppu.win.h[0].set(.Lo, value),
0x0400_0041 => bus.ppu.win.h[0].set(.Hi, value),
0x0400_0042 => bus.ppu.win.h[1].set(.Lo, value),
0x0400_0043 => bus.ppu.win.h[1].set(.Hi, value),
0x0400_0044 => bus.ppu.win.v[0].set(.Lo, value),
0x0400_0045 => bus.ppu.win.v[0].set(.Hi, value),
0x0400_0046 => bus.ppu.win.v[1].set(.Lo, value),
0x0400_0047 => bus.ppu.win.v[1].set(.Hi, value),
0x0400_0048 => bus.ppu.win.setInL(value),
0x0400_0049 => bus.ppu.win.setInH(value),
0x0400_004A => bus.ppu.win.setOutL(value),
@@ -459,18 +467,38 @@ 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,
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,
};
}
};
/// 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 {