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feat: pass jsmolka memory.gba

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-04-11 22:52:17 -03:00
parent ad1f5ea8b8
commit 2c763e9772
2 changed files with 24 additions and 5 deletions
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2
src/Bus.zig
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@ -123,7 +123,7 @@ pub fn write(self: *Self, comptime T: type, address: u32, value: T) void {
// Internal Display Memory
0x05 => self.ppu.palette.write(T, align_addr, value),
0x06 => self.ppu.vram.write(T, align_addr, value),
0x06 => self.ppu.vram.write(T, self.ppu.dispcnt, align_addr, value),
0x07 => self.ppu.oam.write(T, align_addr, value),
// External Memory (Game Pak)

27
src/ppu.zig
View File

@ -457,7 +457,13 @@ const Palette = struct {
self.buf[addr + 1] = @truncate(u8, value >> 8);
self.buf[addr + 0] = @truncate(u8, value >> 0);
},
u8 => return,
u8 => {
const halfword: u16 = @as(u16, value) * 0x0101;
const real_addr = addr & ~@as(u32, 1); // *was* 8-bit read so address won't be aligned
self.buf[real_addr + 1] = @truncate(u8, halfword >> 8);
self.buf[real_addr + 0] = @truncate(u8, halfword >> 0);
},
else => @compileError("PALRAM: Unsupported write width"),
}
}
@ -498,7 +504,8 @@ const Vram = struct {
};
}
pub fn write(self: *Self, comptime T: type, address: usize, value: T) void {
pub fn write(self: *Self, comptime T: type, dispcnt: io.DisplayControl, address: usize, value: T) void {
const mode: u3 = dispcnt.bg_mode.read();
const addr = Self.mirror(address);
switch (T) {
@ -512,7 +519,19 @@ const Vram = struct {
self.buf[addr + 1] = @truncate(u8, value >> 8);
self.buf[addr + 0] = @truncate(u8, value >> 0);
},
u8 => return,
u8 => {
// Ignore if write is in OBJ
switch (mode) {
0, 1, 2 => if (0x0601_0000 <= address and address < 0x0601_8000) return,
else => if (0x0601_4000 <= address and address < 0x0601_8000) return,
}
const halfword: u16 = @as(u16, value) * 0x0101;
const real_addr = addr & ~@as(u32, 1);
self.buf[real_addr + 1] = @truncate(u8, halfword >> 8);
self.buf[real_addr + 0] = @truncate(u8, halfword >> 0);
},
else => @compileError("VRAM: Unsupported write width"),
}
}
@ -568,7 +587,7 @@ const Oam = struct {
self.buf[addr + 1] = @truncate(u8, value >> 8);
self.buf[addr + 0] = @truncate(u8, value >> 0);
},
u8 => return,
u8 => return, // 8-bit writes are explicitly ignored
else => @compileError("OAM: Unsupported write width"),
}
}