Radegast.Rendering.SceneWindow.RenderOccludedObjects C# (CSharp) Method

        private void RenderOccludedObjects()
        {
            if (!RenderSettings.OcclusionCullingEnabled) return;

            GL.EnableClientState(ArrayCap.VertexArray);
            GL.ColorMask(false, false, false, false);
            GL.Disable(EnableCap.CullFace);
            GL.Disable(EnableCap.Lighting);

            if (RenderSettings.UseVBO && !occludedVBOFailed)
            {
                if (boundingBoxVBO == -1)
                {
                    Compat.GenBuffers(out boundingBoxVBO);
                    Compat.BindBuffer(BufferTarget.ArrayBuffer, boundingBoxVBO);
                    Compat.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(sizeof(float) * RHelp.CubeVertices.Length), RHelp.CubeVertices, BufferUsageHint.StaticDraw);
                    if (Compat.BufferSize(BufferTarget.ArrayBuffer) != sizeof(float) * RHelp.CubeVertices.Length)
                    {
                        occludedVBOFailed = true;
                        Compat.BindBuffer(BufferTarget.ArrayBuffer, 0);
                        boundingBoxVBO = -1;
                    }
                }
                else
                {
                    Compat.BindBuffer(BufferTarget.ArrayBuffer, boundingBoxVBO);
                }

                if (boundingBoxVIndexVBO == -1)
                {
                    Compat.GenBuffers(out boundingBoxVIndexVBO);
                    Compat.BindBuffer(BufferTarget.ElementArrayBuffer, boundingBoxVIndexVBO);
                    Compat.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(sizeof(ushort) * RHelp.CubeIndices.Length), RHelp.CubeIndices, BufferUsageHint.StaticDraw);
                    if (Compat.BufferSize(BufferTarget.ElementArrayBuffer) != sizeof(ushort) * RHelp.CubeIndices.Length)
                    {
                        occludedVBOFailed = true;
                        Compat.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
                        boundingBoxVIndexVBO = -1;
                    }
                }
                else
                {
                    Compat.BindBuffer(BufferTarget.ElementArrayBuffer, boundingBoxVIndexVBO);
                }

                GL.VertexPointer(3, VertexPointerType.Float, 0, (IntPtr)0);
            }

            foreach (SceneObject obj in OccludedObjects)
            {
                if ((!obj.HasAlphaFaces && !obj.HasSimpleFaces)) continue;
                obj.HasSimpleFaces = true;
                obj.HasAlphaFaces = false;
                obj.StartSimpleQuery();
                RenderBoundingBox(obj);
                obj.EndSimpleQuery();
            }

            if (RenderSettings.UseVBO)
            {
                Compat.BindBuffer(BufferTarget.ArrayBuffer, 0);
                Compat.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
            }

            GL.ColorMask(true, true, true, true);
            GL.DisableClientState(ArrayCap.VertexArray);
            GL.Enable(EnableCap.CullFace);
            GL.Enable(EnableCap.Lighting);
        }