reorganized repo to show clear module boundaries

src/lib/include/paradiso/sprite.hpp

@@ -0,0 +1,42 @@
+#ifndef PARADISO_SPRITE_HPP
+#define PARADISO_SPRITE_HPP
+
+#include "bitmap.hpp"
+#include "matrix.hpp"
+#include "vector.hpp"
+
+#include <array>
+
+namespace paradiso {
+
+struct Sprite final {
+    using ChangeCountType = std::uint64_t;
+
+    static constexpr Sprite create() noexcept { return {}; }
+
+    Vector2<float> pivot{Vector2<float>::zero()};
+
+    std::array<std::uint32_t, 6> indices{0, 3, 2, 2, 1, 0};
+
+    std::array<Vector3<float>, 4> vertices{
+        Vector3<float>::make(-1.0f, -1.0f, 0.0f),
+        Vector3<float>::make(-1.0f, +1.0f, 0.0f),
+        Vector3<float>::make(+1.0f, +1.0f, 0.0f),
+        Vector3<float>::make(+1.0f, -1.0f, 0.0f)};
+
+    std::array<Vector3<float>, 4> normals{
+        Vector3<float>::z_axis(), Vector3<float>::z_axis(),
+        Vector3<float>::z_axis(), Vector3<float>::z_axis()};
+
+    std::array<Vector2<float>, 4> texture_coordinates{
+        Vector2<float>::make(0.0f, 0.0f), /// 0
+        Vector2<float>::make(0.0f, 1.0f), /// 1
+        Vector2<float>::make(1.0f, 1.0f), /// 2
+        Vector2<float>::make(1.0f, 0.0f)  /// 3
+    };
+
+    ChangeCountType change_count{};
+};
+} // namespace paradiso
+
+#endif