1 files changed, 61 insertions, 0 deletions
diff --git a/draw/wireframe.hpp b/draw/wireframe.hpp
new file mode 100644
index 00000000..9d736419
--- /dev/null
+++ b/draw/wireframe.hpp
@@ -0,0 +1,61 @@
+#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