Managed to get loading the ROM and graphics decompression/overworld tile building stuff to compile, now it's just a matter of translating that data into the Bitmap to display properly.

src/Application/Graphics/Bitmap.cc

@@ -4,7 +4,53 @@ namespace yaze {
 namespace Application {
 namespace Graphics {
 
-Bitmap::Bitmap() {}
+Bitmap::Bitmap(int width, int height, byte* data)
+    : width_(width), height_(height), pixel_data_(data) {}
+
+void Bitmap::Create(GLuint* out_texture) { 
+  // // Read the pixel data from the ROM 
+  // SDL_RWops * src = SDL_RWFromMem(pixel_data_, 0);
+  // // Create the surface from that RW stream 
+  // SDL_Surface* surface = SDL_LoadBMP_RW(src, SDL_FALSE);
+  // GLenum mode = 0;
+  // Uint8 bpp = surface->format->BytesPerPixel;
+  // Uint32 rm = surface->format->Rmask;
+  // if (bpp == 3 && rm == 0x000000ff) mode = GL_RGB;
+  // if (bpp == 3 && rm == 0x00ff0000) mode = GL_BGR;
+  // if (bpp == 4 && rm == 0x000000ff) mode = GL_RGBA;
+  // if (bpp == 4 && rm == 0xff000000) mode = GL_BGRA;
+
+  // GLsizei width = surface->w;
+  // GLsizei height = surface->h;
+  // GLenum format = mode;
+  // GLvoid* pixels = surface->pixels;
+
+  // Create a OpenGL texture identifier
+  GLuint image_texture;
+  glGenTextures(1, &image_texture);
+  glBindTexture(GL_TEXTURE_2D, image_texture);
+
+  // Setup filtering parameters for display
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  // Upload pixels into texture
+#if defined(GL_UNPACK_ROW_LENGTH) && !defined(__EMSCRIPTEN__)
+  glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+#endif
+
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width_, height_, 0, GL_RGBA,
+               GL_UNSIGNED_BYTE, pixel_data_);
+
+  *out_texture = image_texture;
+}
+
+int Bitmap::GetWidth() {
+  return width_;
+}
+int Bitmap::GetHeight() {
+  return height_;
+}
 
 // Simple helper function to load an image into a OpenGL texture with common
 // settings