CSharpGL.ShaderProgram.GetAttributeLocation C# (CSharp) Method

        public int GetAttributeLocation(string attributeName)
        {
            //  If we don't have the attribute name in the dictionary, get it's
            //  location and add it.
            int location;
            if (!attributeNamesToLocations.TryGetValue(attributeName, out location))
            {
                location = glGetAttribLocation(this.ProgramId, attributeName);
                if (location < 0)
                {
                    Debug.WriteLine(string.Format("Failed to getAttribLocation for [{0}]", attributeName));
                }

                attributeNamesToLocations[attributeName] = location;
            }

            //  Return the attribute location.
            return location;
        }

        /// <summary>
        /// 在使用<see cref="VertexArrayObject"/>后，此方法只会执行一次。
        /// </summary>
        /// <param name="e"></param>
        /// <param name="shaderProgram"></param>
        public override void Render(RenderEventArgs e, ShaderProgram shaderProgram)
        {
            uint location = shaderProgram.GetAttributeLocation(this.VarNameInVertexShader);

            GL.BindBuffer(BufferTarget.ArrayBuffer, this.BufferID);
            GL.GetDelegateFor <GL.glVertexAttribPointer>()(location, this.DataSize, this.DataType, false, 0, IntPtr.Zero);
            GL.GetDelegateFor <GL.glEnableVertexAttribArray>()(location);
        }