From 542bc1c103f129c2f648dbe77affb485cfdf93ab Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 9 Oct 2022 02:21:01 +0200
Subject: a

---
 src/wireframe-mesh.cpp | 29 +++++++++++++++++++----------
 src/wireframe-mesh.hpp | 17 ++++++++++++-----
 2 files changed, 31 insertions(+), 15 deletions(-)

(limited to 'src')

diff --git a/src/wireframe-mesh.cpp b/src/wireframe-mesh.cpp
index 14af4a15..1332c682 100644
--- a/src/wireframe-mesh.cpp
+++ b/src/wireframe-mesh.cpp
@@ -1,13 +1,14 @@
 #include "wireframe-mesh.hpp"
 #include "shaders/tile-shader.hpp"
+#include "tile-atlas.hpp"
 #include <Corrade/Containers/Array.h>
-#include <Magnum/ImageView.h>
 #include <Magnum/GL/Renderer.h>
 #include <Magnum/GL/TextureFormat.h>
+#include <Magnum/ImageFlags.h>
+#include <Magnum/ImageView.h>
 #include <Magnum/PixelFormat.h>
 #include <Magnum/PixelStorage.h>
 #include <Magnum/Trade/ImageData.h>
-#include <Magnum/ImageFlags.h>
 
 namespace Magnum::Examples::wireframe
 {
@@ -30,15 +31,23 @@ GL::RectangleTexture wireframe::null::make_constant_texture()
 
 quad::vertex_array quad::make_vertex_array() const
 {
+#if 0
     constexpr auto X = TILE_SIZE[0], Y = TILE_SIZE[1];
     constexpr float Z = 0;
-    vertex_array ret = {{
+    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] },
     }};
-    return ret;
+#else
+    return tile_atlas::floor_quad(center, {TILE_SIZE[0], TILE_SIZE[1]});
+#endif
+}
+
+quad::index_array quad::make_index_array()
+{
+    return tile_atlas::indices(0);
 }
 
 quad::quad(Vector3 center, Vector2 size) : center(center), size(size) {}
@@ -49,18 +58,18 @@ namespace Magnum::Examples {
 
 template <wireframe::traits T> wireframe_mesh<T>::wireframe_mesh()
 {
-    _mesh.setCount((int)T::num_vertices)
-         .setPrimitive(T::primitive)
+    _mesh.setCount((int)T::num_indexes)
          .addVertexBuffer(_texcoords_buffer, 0, tile_shader::TextureCoordinates{})
-         .addVertexBuffer(_vertex_buffer, 0, tile_shader::Position{});
-    CORRADE_INTERNAL_ASSERT(!_mesh.isIndexed());
+         .addVertexBuffer(_vertex_buffer, 0, tile_shader::Position{})
+         .setIndexBuffer(_index_buffer, 0, GL::MeshIndexType::UnsignedShort);
 }
 
 template <wireframe::traits T> void wireframe_mesh<T>::draw(tile_shader& shader, T x)
 {
     GL::Renderer::setLineWidth(2);
-    _vertex_buffer.setData(x.make_vertex_array(), GL::BufferUsage::DynamicDraw);
-    //_texture.bind(0);
+    _vertex_buffer.setSubData(0, x.make_vertex_array());
+    _index_buffer.setSubData(0, x.make_index_array());
+    _texture.bind(0);
     shader.draw(_mesh);
 }
 
diff --git a/src/wireframe-mesh.hpp b/src/wireframe-mesh.hpp
index 7a6892c2..2a7cf10c 100644
--- a/src/wireframe-mesh.hpp
+++ b/src/wireframe-mesh.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-#include "tile-atlas.hpp"
 #include "tile-defs.hpp"
 #include <array>
 #include <utility>
@@ -20,16 +19,19 @@ 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::same_as<std::array<Vector3, T::num_vertices>>;
+    {x.make_index_array() } -> std::same_as<std::array<UnsignedShort, T::num_indexes>>;
 };
 
 struct null final
 {
     static constexpr auto primitive = GL::MeshPrimitive::Triangles;
-    static constexpr std::size_t num_vertices = 0;
+    static constexpr std::size_t num_vertices = 0, num_indexes = 0;
     static GL::RectangleTexture make_constant_texture();
     static std::array<Vector3, 0> make_vertex_array() { return {}; }
+    static std::array<UnsignedShort, 0> make_index_array() { return {}; }
 };
 
 struct quad final
@@ -37,11 +39,14 @@ struct quad final
     quad(Vector3 center, Vector2 size);
     constexpr quad() = default;
 
-    static constexpr std::size_t num_vertices = 4;
-    static constexpr GL::MeshPrimitive primitive = GL::MeshPrimitive::LineLoop;
+    static constexpr std::size_t num_vertices = 4, num_indexes = 6;
+    static constexpr GL::MeshPrimitive primitive = GL::MeshPrimitive::Triangles;
 
     using vertex_array = std::array<Vector3, num_vertices>;
+    using index_array = std::array<UnsignedShort, num_indexes>;
+
     vertex_array make_vertex_array() const;
+    static index_array make_index_array() ;
 
 private:
     Vector3 center = {};
@@ -57,7 +62,9 @@ struct wireframe_mesh final
     void draw(tile_shader& shader, T traits);
 
 private:
-    GL::Buffer _vertex_buffer{std::array<Vector3, T::num_vertices>{}}, _texcoords_buffer{std::array<Vector2, T::num_vertices>{}};
+    GL::Buffer _vertex_buffer{std::array<Vector3, T::num_vertices>{}, GL::BufferUsage::DynamicDraw},
+               _texcoords_buffer{std::array<Vector2, T::num_vertices>{}, GL::BufferUsage::DynamicDraw},
+               _index_buffer{std::array<UnsignedShort , T::num_indexes>{}, GL::BufferUsage::DynamicDraw};
     GL::RectangleTexture _texture = wireframe::null::make_constant_texture();
     GL::Mesh _mesh;
 };
-- 
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