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feat: stub Affine BG registers

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-21 05:12:43 -03:00
parent ff6d2517be
commit 29ee225c1f
2 changed files with 85 additions and 24 deletions
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62
src/bus/io.zig
View File

@ -172,14 +172,14 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_0014 => bus.ppu.setBgOffsets(1, value),
0x0400_0018 => bus.ppu.setBgOffsets(2, value),
0x0400_001C => bus.ppu.setBgOffsets(3, value),
0x0400_0020 => log.debug("Wrote 0x{X:0>8} to BG2PA and BG2PB", .{value}),
0x0400_0024 => log.debug("Wrote 0x{X:0>8} to BG2PC and BG2PD", .{value}),
0x0400_0028 => log.debug("Wrote 0x{X:0>8} to BG2X", .{value}),
0x0400_002C => log.debug("Wrote 0x{X:0>8} to BG2Y", .{value}),
0x0400_0030 => log.debug("Wrote 0x{X:0>8} to BG3PA and BG3PB", .{value}),
0x0400_0034 => log.debug("Wrote 0x{X:0>8} to BG3PC and BG3PD", .{value}),
0x0400_0038 => log.debug("Wrote 0x{X:0>8} to BG3X", .{value}),
0x0400_003C => log.debug("Wrote 0x{X:0>8} to BG3Y", .{value}),
0x0400_0020 => bus.ppu.aff.bg[0].writePaPb(value),
0x0400_0024 => bus.ppu.aff.bg[0].writePcPd(value),
0x0400_0028 => bus.ppu.aff.bg[0].x.raw = value,
0x0400_002C => bus.ppu.aff.bg[0].y.raw = value,
0x0400_0030 => bus.ppu.aff.bg[1].writePaPb(value),
0x0400_0034 => bus.ppu.aff.bg[1].writePcPd(value),
0x0400_0038 => bus.ppu.aff.bg[1].x.raw = value,
0x0400_003C => bus.ppu.aff.bg[1].y.raw = value,
0x0400_0040 => log.debug("Wrote 0x{X:0>8} to WIN0H and WIN1H", .{value}),
0x0400_0044 => log.debug("Wrote 0x{X:0>8} to WIN0V and WIN1V", .{value}),
0x0400_0048 => log.debug("Wrote 0x{X:0>8} to WININ and WINOUT", .{value}),
@ -260,22 +260,22 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_001A => bus.ppu.bg[2].vofs.raw = value,
0x0400_001C => bus.ppu.bg[3].hofs.raw = value,
0x0400_001E => bus.ppu.bg[3].vofs.raw = value,
0x0400_0020 => log.debug("Wrote 0x{X:0>4} to BG2PA", .{value}),
0x0400_0022 => log.debug("Wrote 0x{X:0>4} to BG2PB", .{value}),
0x0400_0024 => log.debug("Wrote 0x{X:0>4} to BG2PC", .{value}),
0x0400_0026 => log.debug("Wrote 0x{X:0>4} to BG2PD", .{value}),
0x0400_0028 => log.debug("Wrote 0x{X:0>4} to BG2X_L", .{value}),
0x0400_002A => log.debug("Wrote 0x{X:0>4} to BG2X_H", .{value}),
0x0400_002C => log.debug("Wrote 0x{X:0>4} to BG2Y_L", .{value}),
0x0400_002E => log.debug("Wrote 0x{X:0>4} to BG2Y_H", .{value}),
0x0400_0030 => log.debug("Wrote 0x{X:0>4} to BG3PA", .{value}),
0x0400_0032 => log.debug("Wrote 0x{X:0>4} to BG3PB", .{value}),
0x0400_0034 => log.debug("Wrote 0x{X:0>4} to BG3PC", .{value}),
0x0400_0036 => log.debug("Wrote 0x{X:0>4} to BG3PD", .{value}),
0x0400_0038 => log.debug("Wrote 0x{X:0>4} to BG3X_L", .{value}),
0x0400_003A => log.debug("Wrote 0x{X:0>4} to BG3X_H", .{value}),
0x0400_003C => log.debug("Wrote 0x{X:0>4} to BG3Y_L", .{value}),
0x0400_003E => log.debug("Wrote 0x{X:0>4} to BG3Y_H", .{value}),
0x0400_0020 => bus.ppu.aff.bg[0].pa.raw = value,
0x0400_0022 => bus.ppu.aff.bg[0].pb.raw = value,
0x0400_0024 => bus.ppu.aff.bg[0].pc.raw = value,
0x0400_0026 => bus.ppu.aff.bg[0].pd.raw = value,
0x0400_0028 => bus.ppu.aff.bg[0].x.raw = bus.ppu.aff.bg[0].x.raw & 0xFFFF_0000 | value,
0x0400_002A => bus.ppu.aff.bg[0].x.raw = bus.ppu.aff.bg[0].x.raw & 0x0000_FFFF | (@as(u32, value) << 16),
0x0400_002C => bus.ppu.aff.bg[0].y.raw = bus.ppu.aff.bg[0].y.raw & 0xFFFF_0000 | value,
0x0400_002E => bus.ppu.aff.bg[0].y.raw = bus.ppu.aff.bg[0].y.raw & 0x0000_FFFF | (@as(u32, value) << 16),
0x0400_0030 => bus.ppu.aff.bg[1].pa.raw = value,
0x0400_0032 => bus.ppu.aff.bg[1].pb.raw = value,
0x0400_0034 => bus.ppu.aff.bg[1].pc.raw = value,
0x0400_0036 => bus.ppu.aff.bg[1].pd.raw = value,
0x0400_0038 => bus.ppu.aff.bg[1].x.raw = bus.ppu.aff.bg[1].x.raw & 0xFFFF_0000 | value,
0x0400_003A => bus.ppu.aff.bg[1].x.raw = bus.ppu.aff.bg[1].x.raw & 0x0000_FFFF | (@as(u32, value) << 16),
0x0400_003C => bus.ppu.aff.bg[1].y.raw = bus.ppu.aff.bg[1].y.raw & 0xFFFF_0000 | value,
0x0400_003E => bus.ppu.aff.bg[1].y.raw = bus.ppu.aff.bg[1].y.raw & 0x0000_FFFF | (@as(u32, value) << 16),
0x0400_0040 => log.debug("Wrote 0x{X:0>4} to WIN0H", .{value}),
0x0400_0042 => log.debug("Wrote 0x{X:0>4} to WIN1H", .{value}),
0x0400_0044 => log.debug("Wrote 0x{X:0>4} to WIN0V", .{value}),
@ -551,6 +551,20 @@ pub const BackgroundOffset = extern union {
raw: u16,
};
pub const BackgroundRefPoint = extern union {
fractional: Bitfield(u32, 0, 8),
integer: Bitfield(u32, 8, 19),
sign: Bit(u32, 27),
raw: u32,
};
pub const BackgroundRotScaleParam = extern union {
fractional: Bitfield(u16, 0, 8),
integer: Bitfield(u16, 8, 7),
sign: Bit(u32, 15),
raw: u16,
};
/// Read / Write
const InterruptRequest = extern union {
vblank: Bit(u16, 0),

47
src/ppu.zig
View File

@ -26,6 +26,7 @@ pub const Ppu = struct {
// Registers
bg: [4]Background,
aff: AffineBackground,
dispcnt: io.DisplayControl,
dispstat: io.DisplayStatus,
@ -58,6 +59,7 @@ pub const Ppu = struct {
// Registers
.bg = [_]Background{Background.init()} ** 4,
.aff = AffineBackground.init(),
.dispcnt = .{ .raw = 0x0000 },
.dispstat = .{ .raw = 0x0000 },
.vcount = .{ .raw = 0x0000 },
@ -679,6 +681,51 @@ const Background = struct {
}
};
const AffineBackground = struct {
const Self = @This();
bg: [2]AffineBackgroundRegisters,
fn init() Self {
return .{
.bg = [_]AffineBackgroundRegisters{AffineBackgroundRegisters.init()} ** 2,
};
}
};
const AffineBackgroundRegisters = struct {
const Self = @This();
x: io.BackgroundRefPoint,
y: io.BackgroundRefPoint,
pa: io.BackgroundRotScaleParam,
pb: io.BackgroundRotScaleParam,
pc: io.BackgroundRotScaleParam,
pd: io.BackgroundRotScaleParam,
fn init() Self {
return .{
.x = .{ .raw = 0 },
.y = .{ .raw = 0 },
.pa = .{ .raw = 0 },
.pb = .{ .raw = 0 },
.pc = .{ .raw = 0 },
.pd = .{ .raw = 0 },
};
}
pub fn writePaPb(self: *Self, value: u32) void {
self.pa.raw = @truncate(u16, value);
self.pb.raw = @truncate(u16, value >> 16);
}
pub fn writePcPd(self: *Self, value: u32) void {
self.pc.raw = @truncate(u16, value);
self.pd.raw = @truncate(u16, value >> 16);
}
};
const ScreenEntry = extern union {
tile_id: Bitfield(u16, 0, 10),
h_flip: Bit(u16, 10),