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1 files changed, 31 insertions, 0 deletions

diff --git a/texture-atlas.hpp b/texture-atlas.hpp
new file mode 100644
index 00000000..e7f8a260
--- /dev/null
+++ b/texture-atlas.hpp
@@ -0,0 +1,31 @@
+#pragma once
+#include <Magnum/Magnum.h>
+#include <Magnum/GL/Texture.h>
+#include <array>
+
+namespace Magnum::Examples {
+
+struct texture_atlas final
+{
+    using vertex_array_type = std::array<Vector3, 4>;
+
+    texture_atlas(const ImageView2D& img, Vector2i dims);
+    std::array<Vector2, 4> texcoords_for_id(int id) const;
+    static vertex_array_type floor_quad(Vector3 center, Vector2 size);
+    static vertex_array_type wall_quad_S(Vector3 center, Vector3 size);
+    static vertex_array_type wall_quad_E(Vector3 center, Vector3 size);
+    static vertex_array_type wall_quad_N(Vector3 center, Vector3 size);
+    static vertex_array_type wall_quad_W(Vector3 center, Vector3 size);
+    static std::array<UnsignedShort, 6> indices(int N);
+    GL::Texture2D& texture() { return tex_; }
+    constexpr int size() const { return dims_.product(); }
+    constexpr Vector2i tile_size() const { return tile_size_; }
+
+    texture_atlas(const texture_atlas&) = delete;
+    texture_atlas& operator=(const texture_atlas&) = delete;
+private:
+    GL::Texture2D tex_;
+    Vector2i size_, dims_, tile_size_;
+};
+
+} // namespace Magnum::Examples