public void Draw(RenderVM data)
{
GL.ClearColor(System.Drawing.Color.MidnightBlue);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.UseProgram(theProgram);
foreach (var scene_kv in data.scenes)
{
var scene = scene_kv.Value;
var view_projection = scene.camera.GetViewProjectionMatrix();
GL.UniformMatrix4(VP_Matrix_Unif, 1, false, ref view_projection.Row0.X);
GL.BindBuffer(BufferTarget.ArrayBuffer, scene.position_buffer_id);
// Write null to avoid implicit sync
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(scene.position_data.Count * Vector3.SizeInBytes), IntPtr.Zero, BufferUsageHint.StreamDraw);
GL.BufferSubData(BufferTarget.ArrayBuffer, IntPtr.Zero, (IntPtr)(scene.position_data.Count * Vector3.SizeInBytes), scene.position_data.ToArray());
// 2nd attribute buffer : instance position vectors
GL.BindBuffer(BufferTarget.ArrayBuffer, scene.position_buffer_id);
GL.EnableVertexAttribArray(1);
GL.VertexAttribPointer(1, 3, VertexAttribPointerType.Float, false, 0, 0);
GL.VertexAttribDivisor(1, 1); // positions : one per quad (its center) -> 1
GL.DrawElementsInstanced(PrimitiveType.Triangles, scene.mesh.indices.Count, DrawElementsType.UnsignedInt, IntPtr.Zero, scene.position_data.Count);
}
GL.UseProgram(0);
GL.Flush();
}
public OpenGLRenderer(RenderVM render_data)
{
// shaderList = new List<int>();
RenderVM = render_data;
RenderVM.SceneLoaded += LoadScenes;
}
