OpenTkEngine.Core.ModelMesh.BindVBO C# (CSharp) Method

        private void BindVBO()
        {
            if (_vboIDs == null)
            {
                _vboIDs = new int[2];
                GL.GenBuffers(2, _vboIDs);
            }

            if (!_vbosBound)
            {
                GL.BindBuffer(BufferTarget.ArrayBuffer, _vboIDs[0]);
                GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(_vertices.Length * sizeof(float)), _vertices, BufferUsageHint.StaticDraw);
                GL.BindBuffer(BufferTarget.ElementArrayBuffer, _vboIDs[1]);
                GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(_indices.Length * sizeof(float)), _indices, BufferUsageHint.StaticDraw);

                int size;
                GL.GetBufferParameter(BufferTarget.ArrayBuffer, BufferParameterName.BufferSize, out size);
                if (_vertices.Length * sizeof(float) != size)
                {
                    throw new ApplicationException("Vertex data not loaded onto graphics card correctly");
                }

                GL.GetBufferParameter(BufferTarget.ElementArrayBuffer, BufferParameterName.BufferSize, out size);
                if (_indices.Length * sizeof(float) != size)
                {
                    throw new ApplicationException("Index data not loaded onto graphics card correctly");
                }
            }
            else
            {
                GL.BindBuffer(BufferTarget.ArrayBuffer, _vboIDs[0]);
                GL.BindBuffer(BufferTarget.ElementArrayBuffer, _vboIDs[1]);
            }

            int vPositionLocation = Graphics.GetShader().GetAttribLocation("vPosition");
            int vNormalLocation = Graphics.GetShader().GetAttribLocation("vNormal");
            GL.EnableVertexAttribArray(vPositionLocation);
            GL.EnableVertexAttribArray(vNormalLocation);

            if (_texCoords)
            {
                int vTexCoordsLocation = Graphics.GetShader().GetAttribLocation("vTexCoords");
                GL.EnableVertexAttribArray(vTexCoordsLocation);
                GL.VertexAttribPointer(vPositionLocation, 3, VertexAttribPointerType.Float, false, 8 * sizeof(float), 0);
                GL.VertexAttribPointer(vNormalLocation, 3, VertexAttribPointerType.Float, true, 8 * sizeof(float), 3 * sizeof(float));
                GL.VertexAttribPointer(vTexCoordsLocation, 2, VertexAttribPointerType.Float, false, 8 * sizeof(float), 6 * sizeof(float));
            }
            else
            {
                GL.VertexAttribPointer(vPositionLocation, 3, VertexAttribPointerType.Float, false, 6 * sizeof(float), 0);
                GL.VertexAttribPointer(vNormalLocation, 3, VertexAttribPointerType.Float, true, 6 * sizeof(float), 3 * sizeof(float));
            }

            _vbosBound = true;
        }