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#pragma once
#include <Magnum/Math/Vector.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/GL/Texture.h>
#include <Magnum/Trade/ImageData.h>
#include <array>
namespace Magnum::Examples {
struct atlas_texture final
{
using vertex_array_type = std::array<Vector3, 4>;
atlas_texture(const Trade::ImageData2D& 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_W(Vector3 center, Vector3 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 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_; }
atlas_texture(const atlas_texture&) = delete;
atlas_texture& operator=(const atlas_texture&) = delete;
private:
GL::Texture2D tex_;
Vector2i size_, dims_, tile_size_;
};
} // namespace Magnum::Examples
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