chore: give DISPCNT DISPSTAT and VCOUNT to PPU struct
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@ -7,60 +7,15 @@ const Bus = @import("../Bus.zig");
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pub const Io = struct {
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const Self = @This();
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dispcnt: DisplayControl,
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dispstat: DisplayStatus,
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vcount: VCount,
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/// Read / Write
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bg0cnt: BackgroundControl,
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/// Read / Write
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bg1cnt: BackgroundControl,
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/// Read / Write
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bg2cnt: BackgroundControl,
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/// Read / Write
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bg3cnt: BackgroundControl,
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/// Write Only
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bg0hofs: BackgroundOffset,
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/// Write Only
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bg0vofs: BackgroundOffset,
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/// Write Only
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bg1hofs: BackgroundOffset,
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/// Write Only
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bg1vofs: BackgroundOffset,
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/// Write Only
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bg2hofs: BackgroundOffset,
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/// Write Only
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bg2vofs: BackgroundOffset,
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/// Write Only
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bg3hofs: BackgroundOffset,
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/// Write Only
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bg3vofs: BackgroundOffset,
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/// Read / Write
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ime: bool,
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ie: InterruptEnable,
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/// Read / Write
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irq: InterruptRequest,
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keyinput: KeyInput,
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pub fn init() Self {
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return .{
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.dispcnt = .{ .raw = 0x0000 },
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.dispstat = .{ .raw = 0x0000 },
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.vcount = .{ .raw = 0x0000 },
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.bg0cnt = .{ .raw = 0x0000 },
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.bg1cnt = .{ .raw = 0x0000 },
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.bg2cnt = .{ .raw = 0x0000 },
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.bg3cnt = .{ .raw = 0x0000 },
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.bg0hofs = .{ .raw = 0x0000 },
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.bg0vofs = .{ .raw = 0x0000 },
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.bg1hofs = .{ .raw = 0x0000 },
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.bg1vofs = .{ .raw = 0x0000 },
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.bg2hofs = .{ .raw = 0x0000 },
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.bg2vofs = .{ .raw = 0x0000 },
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.bg3hofs = .{ .raw = 0x0000 },
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.bg3vofs = .{ .raw = 0x0000 },
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.ime = false,
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.ie = .{ .raw = 0x0000 },
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.irq = .{ .raw = 0x0000 },
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@ -70,7 +25,7 @@ pub const Io = struct {
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};
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/// Read / Write
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const DisplayControl = extern union {
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pub const DisplayControl = extern union {
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bg_mode: Bitfield(u16, 0, 3),
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frame_select: Bit(u16, 4),
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hblank_interval_free: Bit(u16, 5),
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@ -84,7 +39,7 @@ const DisplayControl = extern union {
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};
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/// Read / Write
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const DisplayStatus = extern union {
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pub const DisplayStatus = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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coincidence: Bit(u16, 2),
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@ -96,7 +51,7 @@ const DisplayStatus = extern union {
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};
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/// Read Only
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const VCount = extern union {
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pub const VCount = extern union {
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scanline: Bitfield(u16, 0, 8),
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raw: u16,
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};
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@ -136,7 +91,8 @@ const KeyInput = extern union {
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raw: u16,
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};
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const BackgroundControl = extern union {
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// Read / Write
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pub const BackgroundControl = extern union {
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bg_priority: Bitfield(u16, 0, 2),
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char_base: Bitfield(u16, 2, 2),
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mosaic_enable: Bit(u16, 6),
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@ -147,11 +103,13 @@ const BackgroundControl = extern union {
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raw: u16,
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};
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const BackgroundOffset = extern union {
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/// Write Only
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pub const BackgroundOffset = extern union {
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offset: Bitfield(u16, 0, 9),
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raw: u16,
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};
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/// Read / Write
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const InterruptRequest = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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@ -172,9 +130,9 @@ const InterruptRequest = extern union {
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pub fn read32(bus: *const Bus, addr: u32) u32 {
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return switch (addr) {
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0x0400_0000 => bus.io.dispcnt.raw,
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0x0400_0004 => bus.io.dispstat.raw,
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0x0400_0006 => bus.io.vcount.raw,
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0x0400_0000 => bus.ppu.dispcnt.raw,
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0x0400_0004 => bus.ppu.dispstat.raw,
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0x0400_0006 => bus.ppu.vcount.raw,
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0x0400_0200 => bus.io.ie.raw,
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0x0400_0208 => @boolToInt(bus.io.ime),
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else => std.debug.panic("[I/O:32] tried to read from {X:}", .{addr}),
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@ -183,7 +141,7 @@ pub fn read32(bus: *const Bus, addr: u32) u32 {
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pub fn write32(bus: *Bus, addr: u32, word: u32) void {
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switch (addr) {
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0x0400_0000 => bus.io.dispcnt.raw = @truncate(u16, word),
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0x0400_0000 => bus.ppu.dispcnt.raw = @truncate(u16, word),
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0x0400_0200 => bus.io.ie.raw = @truncate(u16, word),
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0x0400_0208 => bus.io.ime = word & 1 == 1,
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else => std.debug.panic("[I/O:32] tried to write 0x{X:} to 0x{X:}", .{ word, addr }),
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@ -192,9 +150,9 @@ pub fn write32(bus: *Bus, addr: u32, word: u32) void {
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pub fn read16(bus: *const Bus, addr: u32) u16 {
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return switch (addr) {
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0x0400_0000 => bus.io.dispcnt.raw,
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0x0400_0004 => bus.io.dispstat.raw,
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0x0400_0006 => bus.io.vcount.raw,
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0x0400_0000 => bus.ppu.dispcnt.raw,
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0x0400_0004 => bus.ppu.dispstat.raw,
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0x0400_0006 => bus.ppu.vcount.raw,
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0x0400_0130 => bus.io.keyinput.raw,
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0x0400_0200 => bus.io.ie.raw,
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0x0400_0208 => @boolToInt(bus.io.ime),
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@ -204,11 +162,11 @@ pub fn read16(bus: *const Bus, addr: u32) u16 {
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pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
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switch (addr) {
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0x0400_0000 => bus.io.dispcnt.raw = halfword,
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0x0400_0004 => bus.io.dispstat.raw = halfword,
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0x0400_0008 => bus.io.bg0cnt.raw = halfword,
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0x0400_0010 => bus.io.bg0hofs.raw = halfword,
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0x0400_0012 => bus.io.bg0vofs.raw = halfword,
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0x0400_0000 => bus.ppu.dispcnt.raw = halfword,
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0x0400_0004 => bus.ppu.dispstat.raw = halfword,
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0x0400_0008 => bus.ppu.bg0.cnt.raw = halfword,
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0x0400_0010 => bus.ppu.bg0.hofs.raw = halfword,
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0x0400_0012 => bus.ppu.bg0.vofs.raw = halfword,
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0x0400_0200 => bus.io.ie.raw = halfword,
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0x0400_0202 => bus.io.irq.raw = halfword,
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0x0400_0208 => bus.io.ime = halfword & 1 == 1,
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@ -218,10 +176,10 @@ pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
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pub fn read8(bus: *const Bus, addr: u32) u8 {
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return switch (addr) {
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0x0400_0000 => @truncate(u8, bus.io.dispcnt.raw),
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0x0400_0004 => @truncate(u8, bus.io.dispstat.raw),
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0x0400_0000 => @truncate(u8, bus.ppu.dispcnt.raw),
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0x0400_0004 => @truncate(u8, bus.ppu.dispstat.raw),
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0x0400_0200 => @truncate(u8, bus.io.ie.raw),
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0x0400_0006 => @truncate(u8, bus.io.vcount.raw),
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0x0400_0006 => @truncate(u8, bus.ppu.vcount.raw),
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else => std.debug.panic("[I/O:8] tried to read from {X:}", .{addr}),
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};
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}
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49
src/ppu.zig
49
src/ppu.zig
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@ -1,10 +1,11 @@
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const std = @import("std");
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const io = @import("bus/io.zig");
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const EventKind = @import("scheduler.zig").EventKind;
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const Io = @import("bus/io.zig").Io;
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const Scheduler = @import("scheduler.zig").Scheduler;
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const Allocator = std.mem.Allocator;
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pub const width = 240;
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pub const height = 160;
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pub const framebuf_pitch = width * @sizeOf(u16);
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@ -12,6 +13,16 @@ pub const framebuf_pitch = width * @sizeOf(u16);
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pub const Ppu = struct {
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const Self = @This();
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// Registers
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bg0: Background,
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bg1: Background,
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bg2: Background,
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bg3: Background,
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dispcnt: io.DisplayControl,
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dispstat: io.DisplayStatus,
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vcount: io.VCount,
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vram: Vram,
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palette: Palette,
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oam: Oam,
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@ -33,6 +44,15 @@ pub const Ppu = struct {
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.sched = sched,
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.framebuf = framebuf,
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.alloc = alloc,
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// Registers
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.bg0 = Background.init(),
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.bg1 = Background.init(),
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.bg2 = Background.init(),
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.bg3 = Background.init(),
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.dispcnt = .{ .raw = 0x0000 },
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.dispstat = .{ .raw = 0x0000 },
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.vcount = .{ .raw = 0x0000 },
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};
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}
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@ -42,9 +62,9 @@ pub const Ppu = struct {
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self.palette.deinit();
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}
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pub fn drawScanline(self: *Self, io: *const Io) void {
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const bg_mode = io.dispcnt.bg_mode.read();
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const scanline = io.vcount.scanline.read();
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pub fn drawScanline(self: *Self) void {
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const bg_mode = self.dispcnt.bg_mode.read();
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const scanline = self.vcount.scanline.read();
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switch (bg_mode) {
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0x0 => {
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@ -58,7 +78,7 @@ pub const Ppu = struct {
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std.mem.copy(u8, self.framebuf[start..end], self.vram.buf[start..end]);
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},
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0x4 => {
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const select = io.dispcnt.frame_select.read();
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const select = self.dispcnt.frame_select.read();
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const vram_start = width * @as(usize, scanline);
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const buf_start = vram_start * @sizeOf(u16);
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@ -205,3 +225,22 @@ const Oam = struct {
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return self.buf[idx];
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}
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};
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const Background = struct {
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const Self = @This();
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/// Read / Write
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cnt: io.BackgroundControl,
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/// Write Only
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hofs: io.BackgroundOffset,
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/// Write Only
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vofs: io.BackgroundOffset,
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fn init() Self {
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return .{
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.cnt = .{ .raw = 0x0000 },
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.hofs = .{ .raw = 0x0000 },
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.vofs = .{ .raw = 0x0000 },
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};
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}
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};
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@ -38,28 +38,28 @@ pub const Scheduler = struct {
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},
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.HBlank => {
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// The End of a Hblank (During Draw or Vblank)
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const old_scanline = bus.io.vcount.scanline.read();
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const old_scanline = bus.ppu.vcount.scanline.read();
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const scanline = (old_scanline + 1) % 228;
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bus.io.vcount.scanline.write(scanline);
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bus.io.dispstat.hblank.unset();
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bus.ppu.vcount.scanline.write(scanline);
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bus.ppu.dispstat.hblank.unset();
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if (scanline < 160) {
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// Transitioning to another Draw
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self.push(.Draw, self.tick + (240 * 4));
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} else {
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// Transitioning to a Vblank
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if (scanline < 227) bus.io.dispstat.vblank.set() else bus.io.dispstat.vblank.unset();
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if (scanline < 227) bus.ppu.dispstat.vblank.set() else bus.ppu.dispstat.vblank.unset();
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self.push(.VBlank, self.tick + (240 * 4));
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}
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},
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.Draw => {
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// The end of a Draw
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bus.ppu.drawScanline(&bus.io);
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bus.ppu.drawScanline();
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// Transitioning to a Hblank
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bus.io.dispstat.hblank.set();
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bus.ppu.dispstat.hblank.set();
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self.push(.HBlank, self.tick + (68 * 4));
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},
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.VBlank => {
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