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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 79af17a457
commit d6304a7382
1 changed files with 23 additions and 0 deletions
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23
src/core/bus/io.zig
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@@ -305,11 +305,21 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_0009 => bus.ppu.bg[0].cnt.raw = setHi(u16, bus.ppu.bg[0].cnt.raw, value),
0x0400_000A => bus.ppu.bg[1].cnt.raw = setLo(u16, bus.ppu.bg[1].cnt.raw, value),
0x0400_000B => bus.ppu.bg[1].cnt.raw = setHi(u16, bus.ppu.bg[1].cnt.raw, value),
0x0400_0040 => bus.ppu.win.h[0].raw = setLo(u16, bus.ppu.win.h[0].raw, value),
0x0400_0041 => bus.ppu.win.h[0].raw = setHi(u16, bus.ppu.win.h[0].raw, value),
0x0400_0042 => bus.ppu.win.h[1].raw = setLo(u16, bus.ppu.win.h[1].raw, value),
0x0400_0043 => bus.ppu.win.h[1].raw = setHi(u16, bus.ppu.win.h[1].raw, value),
0x0400_0044 => bus.ppu.win.v[0].raw = setLo(u16, bus.ppu.win.v[0].raw, value),
0x0400_0045 => bus.ppu.win.v[0].raw = setHi(u16, bus.ppu.win.v[0].raw, value),
0x0400_0046 => bus.ppu.win.v[1].raw = setLo(u16, bus.ppu.win.v[1].raw, value),
0x0400_0047 => bus.ppu.win.v[1].raw = setHi(u16, bus.ppu.win.v[1].raw, value),
0x0400_0048 => bus.ppu.win.in.raw = setLo(u16, bus.ppu.win.in.raw, value),
0x0400_0049 => bus.ppu.win.in.raw = setHi(u16, bus.ppu.win.in.raw, value),
0x0400_004A => bus.ppu.win.out.raw = setLo(u16, bus.ppu.win.out.raw, value),
0x0400_0054 => bus.ppu.bldy.raw = setLo(u16, bus.ppu.bldy.raw, value),
// Sound
0x0400_0060...0x0400_00A7 => apu.write(T, &bus.apu, address, value),
@@ -462,8 +472,12 @@ 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,
@@ -471,9 +485,18 @@ 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 {