fix Raylib RGB565 to RGBA8888 texture conversion and audio streaming

src/platform/raylib.zig

@@ -10,6 +10,8 @@ pub const Driver = struct {
     height: i32,
     scale: i32,
 
+    rgba_buffer: [256 * 240]u32 = [_]u32{0xFF000000} ** (256 * 240),
+
     event_queue: [16]platform.Event = undefined,
     event_head: usize = 0,
     event_tail: usize = 0,
@@ -19,7 +21,7 @@ pub const Driver = struct {
         c.SetTargetFPS(60);
 
         c.InitAudioDevice();
-        c.SetAudioStreamBufferSizeDefault(1024);
+        c.SetAudioStreamBufferSizeDefault(2048);
 
         const stream = c.LoadAudioStream(44100, 16, 1);
         c.PlayAudioStream(stream);
@@ -87,8 +89,15 @@ pub const Driver = struct {
 
     pub fn renderVideo(self: *Driver, output: usize, frame: contract.VideoFrame) void {
         _ = output;
-        if (frame.data.len > 0) {
-            c.UpdateTexture(self.texture, frame.data.ptr);
+        if (frame.data.len >= 256 * 240 * 2) {
+            const raw_pixels = std.mem.bytesAsSlice(u16, frame.data);
+            for (raw_pixels[0..@min(raw_pixels.len, self.rgba_buffer.len)], 0..) |pixel, i| {
+                const r = @as(u32, (pixel >> 11) & 0x1F) * 255 / 31;
+                const g = @as(u32, (pixel >> 5) & 0x3F) * 255 / 63;
+                const b = @as(u32, pixel & 0x1F) * 255 / 31;
+                self.rgba_buffer[i] = r | (g << 8) | (b << 16) | (0xFF << 24);
+            }
+            c.UpdateTexture(self.texture, &self.rgba_buffer);
         }
 
         c.BeginDrawing();
@@ -107,7 +116,7 @@ pub const Driver = struct {
 
     pub fn queueAudio(self: *Driver, output: usize, buffer: contract.AudioBuffer) void {
         _ = output;
-        if (buffer.frames > 0 and c.IsAudioStreamProcessed(self.audio_stream)) {
+        if (buffer.frames > 0) {
             c.UpdateAudioStream(self.audio_stream, buffer.data.ptr, @intCast(buffer.frames));
         }
     }