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#pragma once
#include <array>
#include <memory>
#include <Corrade/Containers/String.h>
#include <Magnum/Magnum.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/GL/Texture.h>
namespace floormat {
struct tile_atlas final
{
using quad = std::array<Vector3, 4>;
using texcoords = std::array<Vector2, 4>;
tile_atlas(StringView name, const ImageView2D& img, Vector2ub tile_count);
texcoords texcoords_for_id(std::size_t id) const;
static constexpr quad floor_quad(Vector3 center, Vector2 size);
static constexpr quad wall_quad_N(Vector3 center, Vector3 size);
static constexpr quad wall_quad_W(Vector3 center, Vector3 size);
static constexpr std::array<UnsignedShort, 6> indices(std::size_t N);
[[maybe_unused]] Vector2ui pixel_size() const { return size_; }
std::size_t num_tiles() const { return Vector2ui{dims_}.product(); }
Vector2ub num_tiles2() const { return dims_; }
GL::Texture2D& texture() { return tex_; }
StringView name() const { return name_; }
private:
static std::unique_ptr<const texcoords[]> make_texcoords_array(Vector2ui pixel_size, Vector2ub tile_count);
static texcoords make_texcoords(Vector2ui pixel_size, Vector2ub tile_count, std::size_t i);
std::unique_ptr<const texcoords[]> texcoords_;
GL::Texture2D tex_;
String name_;
Vector2ui size_;
Vector2ub 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 */
}
constexpr tile_atlas::quad tile_atlas::floor_quad(const Vector3 center, const Vector2 size)
{
float x = size[0]*.5f, y = size[1]*.5f;
return {{
{ x + center[0], -y + center[1], center[2]},
{ x + center[0], y + center[1], center[2]},
{-x + center[0], -y + center[1], center[2]},
{-x + center[0], y + center[1], center[2]},
}};
}
constexpr tile_atlas::quad tile_atlas::wall_quad_W(const Vector3 center, const Vector3 size)
{
float x = size[0]*.5f, y = size[1]*.5f, z = size[2];
return {{
{-x + center[0], y + center[1], center[2] },
{-x + center[0], y + center[1], z + center[2] },
{-x + center[0], -y + center[1], center[2] },
{-x + center[0], -y + center[1], z + center[2] },
}};
}
constexpr tile_atlas::quad tile_atlas::wall_quad_N(const Vector3 center, const Vector3 size)
{
float x = size[0]*.5f, y = size[1]*.5f, z = size[2];
return {{
{ x + center[0], -y + center[1], center[2] },
{ x + center[0], -y + center[1], z + center[2] },
{-x + center[0], -y + center[1], center[2] },
{-x + center[0], -y + center[1], z + center[2] },
}};
}
} // namespace floormat
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