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chore(bus): only perform one allocation for fastmem tables

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-11-01 07:03:15 -03:00
parent bc52461f0f
commit 637d81ce44
1 changed files with 6 additions and 7 deletions
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13
src/core/Bus.zig
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@ -58,11 +58,11 @@ write_tables: [2]*const [table_len]?*anyopaque,
allocator: Allocator,
pub fn init(self: *Self, allocator: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, paths: FilePaths) !void {
const read_table = try allocator.create([table_len]?*const anyopaque);
const write_tables = try allocator.alloc(?*anyopaque, 2 * table_len); // Copy of the write table just for u8 writes
const tables = try allocator.alloc(?*anyopaque, 3 * table_len); // Allocate all tables
const left_write: *[table_len]?*anyopaque = write_tables[0..table_len];
const right_write: *[table_len]?*anyopaque = write_tables[table_len .. 2 * table_len];
const read_table: *[table_len]?*const anyopaque = tables[0..table_len];
const left_write: *[table_len]?*anyopaque = tables[table_len .. 2 * table_len];
const right_write: *[table_len]?*anyopaque = tables[2 * table_len .. 3 * table_len];
self.* = .{
.pak = try GamePak.init(allocator, cpu, paths.rom, paths.save),
@ -98,12 +98,11 @@ pub fn deinit(self: *Self) void {
self.pak.deinit();
self.bios.deinit();
self.ppu.deinit();
self.allocator.destroy(self.read_table);
// This is so I can deallocate the original `allocator.alloc`. I have to re-make the type
// since I'm not keeping it around, This is very jank and bad though
// FIXME: please figure out another way
self.allocator.free(@ptrCast([*]const ?*anyopaque, self.write_tables[0][0..])[0 .. 2 * table_len]);
self.allocator.free(@ptrCast([*]const ?*anyopaque, self.write_tables[0][0..])[0 .. 3 * table_len]);
self.* = undefined;
}
@ -412,7 +411,7 @@ pub fn slowWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T
// Internal Display Memory
0x05 => self.ppu.palette.write(T, address, value),
0x06 => self.ppu.vram.write(T, self.ppu.dispcnt, address, value),
0x07 => unreachable, // completely handled by fastmem (TODO: Is it faster if I dont?)
0x07 => unreachable, // completely handled by fastmem
// External Memory (Game Pak)
0x08...0x0D => self.pak.write(T, self.dma[3].word_count, address, value),