const std = @import("std"); const Allocator = std.mem.Allocator; const Scheduler = @import("scheduler.zig").Scheduler; pub const Ppu = struct { vram: Vram, palette: Palette, sched: *Scheduler, pub fn init(alloc: Allocator, sched: *Scheduler) !@This() { return @This(){ .vram = try Vram.init(alloc), .palette = try Palette.init(alloc), .sched = sched, }; } pub fn deinit(self: *@This()) void { self.vram.deinit(); } }; const Palette = struct { buf: []u8, alloc: Allocator, fn init(alloc: Allocator) !@This() { return @This(){ .buf = try alloc.alloc(u8, 0x400), .alloc = alloc, }; } fn deinit(self: *@This()) void { self.alloc.free(self.buf); } pub inline fn get32(self: *const @This(), idx: usize) u32 { return (@as(u32, self.get16(idx + 2)) << 16) | @as(u32, self.get16(idx)); } pub inline fn set32(self: *@This(), idx: usize, word: u32) void { self.set16(idx + 2, @truncate(u16, word >> 16)); self.set16(idx, @truncate(u16, word)); } pub inline fn get16(self: *const @This(), idx: usize) u16 { return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]); } pub inline fn set16(self: *@This(), idx: usize, halfword: u16) void { self.buf[idx + 1] = @truncate(u8, halfword >> 8); self.buf[idx] = @truncate(u8, halfword); } pub inline fn get8(self: *const @This(), idx: usize) u8 { return self.buf[idx]; } }; const Vram = struct { buf: []u8, alloc: Allocator, fn init(alloc: Allocator) !@This() { return @This(){ .buf = try alloc.alloc(u8, 0x18000), .alloc = alloc, }; } fn deinit(self: *@This()) void { self.alloc.free(self.buf); } pub inline fn get32(self: *const @This(), idx: usize) u32 { return (@as(u32, self.get16(idx + 2)) << 16) | @as(u32, self.get16(idx)); } pub inline fn set32(self: *@This(), idx: usize, word: u32) void { self.set16(idx + 2, @truncate(u16, word >> 16)); self.set16(idx, @truncate(u16, word)); } pub inline fn get16(self: *const @This(), idx: usize) u16 { return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]); } pub inline fn set16(self: *@This(), idx: usize, halfword: u16) void { self.buf[idx + 1] = @truncate(u8, halfword >> 8); self.buf[idx] = @truncate(u8, halfword); } pub inline fn get8(self: *const @This(), idx: usize) u8 { return self.buf[idx]; } };