fix: allocate framebuf on heap

src/main.zig

@@ -6,6 +6,8 @@ const Bus = @import("Bus.zig");
 const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
 const Scheduler = @import("scheduler.zig").Scheduler;
 
+const buf_pitch = @import("ppu.zig").buf_pitch;
+
 pub fn main() anyerror!void {
     // Allocator for Emulator + CLI Aruments
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@@ -57,14 +59,6 @@ pub fn main() anyerror!void {
     const texture = SDL.SDL_CreateTexture(renderer, SDL.SDL_PIXELFORMAT_BGR555, SDL.SDL_TEXTUREACCESS_STREAMING, 240, 160) orelse sdlPanic();
     defer SDL.SDL_DestroyTexture(texture);
 
-    const buf_pitch = 240 * @sizeOf(u16);
-    const buf_len = buf_pitch * 160;
-    var white: [buf_len]u8 = [_]u8{ 0xFF, 0x7F } ** (buf_len / 2);
-
-    var white_heap = try alloc.alloc(u8, buf_len);
-    for (white) |b, i| white_heap[i] = b;
-    defer alloc.free(white_heap);
-
     emu_loop: while (true) {
         emu.runFrame(&scheduler, &cpu, &bus);
 
@@ -76,7 +70,8 @@ pub fn main() anyerror!void {
             else => {},
         }
 
-        _ = SDL.SDL_UpdateTexture(texture, null, &white_heap, buf_pitch);
+        const buf_ptr = bus.ppu.frame_buf.ptr;
+        _ = SDL.SDL_UpdateTexture(texture, null, buf_ptr, buf_pitch);
         _ = SDL.SDL_RenderCopy(renderer, texture, null, null);
         SDL.SDL_RenderPresent(renderer);
     }