public static void addDrawable(Drawable2D drawable, BeginMode begin_mode, ProgramObject program)
{
DrawingInfo drawing_info = new DrawingInfo();
drawing_info.begin_mode = begin_mode;
drawing_info.program = program;
GL.GenVertexArrays(1, out drawing_info.VAO_ID);
GL.GenBuffers(1, out drawing_info.VBO_ID);
objects.Add(drawable, drawing_info);
}
public static void paintDrawable(Drawable2D drawable)
{
DrawingInfo drawing_info = objects[drawable];
GL.UseProgram(drawing_info.program.program_handle);
GL.BindVertexArray(drawing_info.VAO_ID);
GL.BindBuffer(BufferTarget.ArrayBuffer, drawing_info.VBO_ID);
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(drawable.vertices.Length * Vector4.SizeInBytes),
drawable.vertices, BufferUsageHint.StaticDraw);
int location = GL.GetUniformLocation(drawing_info.program.program_handle, "projectionMatrix");
GL.UniformMatrix4(location, false, ref Matrix4.Identity);
location = GL.GetUniformLocation(drawing_info.program.program_handle, "modelView");
GL.UniformMatrix4(location, false, ref drawable.transformation);
GL.EnableVertexAttribArray(0);
GL.EnableVertexAttribArray(1);
GL.VertexAttribPointer(0, 4, VertexAttribPointerType.Float, false, 0, 0);
GL.VertexAttribPointer(1, 4, VertexAttribPointerType.Float, false, 0, 4 * Vector4.SizeInBytes);
GL.DrawArrays(drawing_info.begin_mode, 0, drawable.vertices.Length / 2);
/*Matrix4 zoom = Matrix4.Scale(3f) * Matrix4.CreateTranslation(new Vector3(0.5f, 0, 0));
GL.UniformMatrix4(location, false, ref zoom);
GL.Viewport(300, 0, 300, 300);
GL.DrawArrays(drawing_info.begin_mode, 0, drawable.vertices.Length / 2);
GL.DisableVertexAttribArray(0);
GL.DisableVertexAttribArray(1);*/
GL.UseProgram(0);
}