48 lines
1.3 KiB
Zig
48 lines
1.3 KiB
Zig
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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pub const Ppu = struct {
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vram: Vram,
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pub fn init(alloc: Allocator) !@This() {
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return @This(){
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.vram = try Vram.init(alloc),
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};
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}
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};
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const Vram = struct {
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buf: []u8,
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fn init(alloc: Allocator) !@This() {
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return @This(){
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.buf = try alloc.alloc(u8, 0x18000),
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};
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}
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pub inline fn get32(self: *const @This(), idx: usize) u32 {
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return (@as(u32, self.buf[idx + 3]) << 24) | (@as(u32, self.buf[idx + 2]) << 16) | (@as(u32, self.buf[idx + 1]) << 8) | (@as(u32, self.buf[idx]));
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}
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pub inline fn set32(self: *@This(), idx: usize, word: u32) void {
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self.buf[idx + 3] = @truncate(u8, word >> 24);
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self.buf[idx + 2] = @truncate(u8, word >> 16);
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self.buf[idx + 1] = @truncate(u8, word >> 8);
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self.buf[idx] = @truncate(u8, word);
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}
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pub inline fn get16(self: *const @This(), idx: usize) u16 {
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return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]);
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}
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pub inline fn set16(self: *@This(), idx: usize, halfword: u16) void {
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self.buf[idx + 1] = @truncate(u8, halfword >> 8);
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self.buf[idx] = @truncate(u8, halfword);
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}
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pub inline fn get8(self: *const @This(), idx: usize) u8 {
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return self.buf[idx];
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}
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};
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