1 files changed, 68 insertions, 0 deletions
diff --git a/src/wireframe-mesh.cpp b/src/wireframe-mesh.cpp
new file mode 100644
index 00000000..5b60cead
--- /dev/null
+++ b/src/wireframe-mesh.cpp
@@ -0,0 +1,68 @@
+#include "wireframe-mesh.hpp"
+#include "shaders/tile-shader.hpp"
+#include <Corrade/Containers/Array.h>
+#include <Magnum/ImageView.h>
+#include <Magnum/GL/TextureFormat.h>
+#include <Magnum/PixelFormat.h>
+#include <Magnum/Trade/ImageData.h>
+
+namespace Magnum::Examples::wireframe_traits {
+
+GL::RectangleTexture wireframe_traits::null::make_constant_texture()
+{
+    Trade::ImageData2D img{PixelFormat::RGBA8UI, {1, 1}, // NOLINT(misc-const-correctness)
+                           Containers::Array<char>{Corrade::DirectInit, 4, (char)(unsigned char)255}};
+
+    GL::RectangleTexture tex;
+    tex.setWrapping(GL::SamplerWrapping::Repeat)
+       .setMagnificationFilter(GL::SamplerFilter::Nearest)
+       .setMinificationFilter(GL::SamplerFilter::Nearest)
+       .setMaxAnisotropy(0)
+       .setStorage(GL::textureFormat(img.format()), img.size())
+       .setSubImage({}, std::move(img));
+    return tex;
+}
+
+quad::vertex_array quad::make_vertex_positions_array() const
+{
+    constexpr auto X = TILE_SIZE[0], Y = TILE_SIZE[1];
+    constexpr float Z = 0;
+    return {{
+        { -X + center[0], -Y + center[1], Z + center[2] },
+        {  X + center[0], -Y + center[1], Z + center[2] },
+        {  X + center[0],  Y + center[1], Z + center[2] },
+        { -X + center[0],  Y + center[1], Z + center[2] },
+    }};
+}
+
+quad::quad(Vector3 center, Vector2 size) : center(center), size(size) {}
+
+} // namespace Magnum::Examples::wireframe_traits
+
+namespace Magnum::Examples {
+
+using wireframe_traits::traits;
+
+template <traits T> wireframe_mesh<T>::wireframe_mesh()
+{
+    _mesh.setCount((int)T::num_vertices)
+         .addVertexBuffer(_texcoords_buffer, 0, tile_shader::TextureCoordinates{})
+         .addVertexBuffer(_positions_buffer, 0, tile_shader::Position{});
+    if constexpr(T::num_indices > 0)
+        _mesh.setIndexBuffer(_index_buffer, 0, GL::MeshIndexType::UnsignedShort);
+    CORRADE_INTERNAL_ASSERT(T::num_indices > 0 == _mesh.isIndexed());
+};
+
+template <traits T> void wireframe_mesh<T>::draw(tile_shader& shader, T x)
+{
+    _positions_buffer.setData(x.make_vertex_positions_array(), GL::BufferUsage::DynamicDraw);
+    if constexpr(T::num_indices > 0)
+        _index_buffer.setData(x.make_index_array(), GL::BufferUsage::DynamicDraw);
+    shader.draw(_mesh);
+}
+
+template struct wireframe_mesh<wireframe_traits::null>;
+template struct wireframe_mesh<wireframe_traits::quad>;
+
+} // namespace Magnum::Examples
+