Added dislay list support for 3D models

example/main.cpp

@@ -112,6 +112,7 @@ int main(int argc, char** argv)
     raptor.assign_texture(raptor_texture);
     raptor.set_scaling(0.01,0.01,0.01);
     raptor.set_rotation(-90,1,0,0);
+    raptor.prepare_displaylist();
 
 
     glutTimerFunc(50,update_angle,0);

src/DataHandling/Model3D.cpp

@@ -30,10 +30,23 @@ Model3D::~Model3D()
         delete(face_textures);
         delete(normals);
     }
+
+    if (has_displaylist)
+    {
+        glDeleteLists(display_list_index,1);
+    }
 }
 
 void Model3D::draw_model()
 {
+    if (has_displaylist)
+    {
+        glCallList(display_list_index);
+        return; // Executing the regular draw calls is unnecessary
+    }
+
+    // If there is no display list available, draw each triangles and texture them if necessary.
+
     if (is_textured)
     {
         glEnable(GL_ALPHA_TEST);
@@ -84,6 +97,17 @@ void Model3D::draw_model()
     }
 }
 
+void Model3D::prepare_displaylist()
+{
+    display_list_index = glGenLists(1);
+
+    glNewList(display_list_index,GL_COMPILE);
+    draw_model();
+    glEndList();
+
+    has_displaylist = true;
+}
+
 bool Model3D::load_ascii_off_file(const std::string& file_name)
 {
     std::fstream file_stream(file_name, std::ios_base::in);

src/DataHandling/Model3D.h

@@ -26,9 +26,13 @@ public:
     void set_scaling(float x_scale, float y_scale, float z_scale);
     void set_rotation(float angle, float x, float y, float z);
 
+    /// Draws the model, using a display list if available.
     void draw_model();
+    /// Sets up an OpenGL display list for the model
+    void prepare_displaylist();
 
     bool is_textured;
+    bool has_displaylist = false;
 private:
     uint32_t vertex_count;
     uint32_t face_count;
@@ -51,6 +55,8 @@ private:
     Vec3f scaling{};
     Vec3f rotation_axis{};
     float rotation_angle{};
+
+    GLuint display_list_index;
 };