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#pragma once
#include <Magnum/Magnum.h>
#include <Magnum/GL/Texture.h>
#include <array>
namespace Magnum::Examples {
struct tile_atlas final
{
using vertex_array_type = std::array<Vector3, 4>;
tile_atlas(const ImageView2D& img, Vector2i dims);
std::array<Vector2, 4> texcoords_for_id(std::size_t id) const;
static vertex_array_type floor_quad(Vector3 center, Vector2 size);
static vertex_array_type wall_quad_N(Vector3 center, Vector3 size);
static vertex_array_type wall_quad_W(Vector3 center, Vector3 size);
static constexpr std::array<UnsignedShort, 6> indices(std::size_t N);
std::size_t size() const { return (std::size_t)dims_.product(); }
Vector2i tile_size() const { return size_ / dims_; }
GL::Texture2D& texture() { return tex_; }
tile_atlas() = default;
tile_atlas(const tile_atlas&) = delete;
tile_atlas& operator=(const tile_atlas&) = delete;
private:
GL::Texture2D tex_;
Vector2i size_, dims_;
};
constexpr std::array<UnsignedShort, 6> tile_atlas::indices(std::size_t N)
{
using u16 = UnsignedShort;
return { /* 3--1 1 */
(u16)(0+N*4), (u16)(1+N*4), (u16)(2+N*4), /* | / /| */
(u16)(2+N*4), (u16)(1+N*4), (u16)(3+N*4), /* |/ / | */
}; /* 2 2--0 */
}
} // namespace Magnum::Examples
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