Finished the first pass of moving everything around and cleaning up as much as possible.

texture.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+#include <string>
+
+struct Sprite {
+  double x;
+  double y;
+  int texture;
+  // ZED: this should be a separate transform parameter
+  double elevation=0;
+  int uDiv=1;
+  int vDiv=1;
+};
+
+using Image = std::vector<uint32_t>;
+
+struct TexturePack {
+  int NUM_SPRITES=1;
+  static const int TEXTURE_WIDTH=256; // must be power of two
+  static const int TEXTURE_HEIGHT=256; // must be power of two
+
+  std::vector<Image> images;
+  std::vector<Sprite> sprites{{4.0, 3.55, 6}};
+  Image floor;
+  Image ceiling;
+
+  void load_textures();
+  std::vector<uint32_t> load_image(std::string filename);
+  Sprite &get_sprite(size_t sprite_num);
+  Image& get_texture(size_t num);
+};