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#pragma once
#include "tile-defs.hpp"
#include <Magnum/GL/Buffer.h>
#include <Magnum/GL/Mesh.h>
#include "Magnum/GL/Texture.h"
namespace floormat {
struct tile_shader;
namespace wireframe
{
template<typename T>
concept traits = requires (const T& x) {
{T::num_vertices} -> std::convertible_to<std::size_t>;
{T::num_indexes} -> std::convertible_to<std::size_t>;
{x.primitive} -> std::convertible_to<GL::MeshPrimitive>;
{x.make_vertex_array() } -> std::convertible_to<ArrayView<const void>>;
{T::make_index_array() } -> std::convertible_to<ArrayView<const void>>;
{x.on_draw()} -> std::same_as<void>;
};
struct mesh_base
{
static GL::Texture2D make_constant_texture();
GL::Buffer _vertex_buffer{{}, GL::BufferUsage::DynamicDraw}, _texcoords_buffer, _index_buffer;
GL::Texture2D _texture = make_constant_texture();
GL::Mesh _mesh;
mesh_base(GL::MeshPrimitive primitive, ArrayView<const void> index_data,
std::size_t num_vertices, std::size_t num_indexes);
void draw(tile_shader& shader);
void set_subdata(ArrayView<const void> array);
};
} // namespace wireframe
template<wireframe::traits T>
struct wireframe_mesh final : private wireframe::mesh_base
{
wireframe_mesh();
void draw(tile_shader& shader, T traits);
};
template<wireframe::traits T>
wireframe_mesh<T>::wireframe_mesh() :
wireframe::mesh_base{T::primitive, T::make_index_array(), T::num_vertices, T::num_indexes}
{
}
template <wireframe::traits T> void wireframe_mesh<T>::draw(tile_shader& shader, T x)
{
//_vertex_buffer.setData({nullptr, sizeof(Vector3) * T::num_vertices}, GL::BufferUsage::DynamicDraw); // orphan the buffer
set_subdata(x.make_vertex_array());
x.on_draw();
mesh_base::draw(shader);
}
} // namespace floormat
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