private int CreateTexture(Bitmap texture, TextureUnit unit, TextureMinFilter minFilter, TextureMagFilter magFilter)
{
int textureId = GL.GenTexture();
GL.ActiveTexture(unit);
GL.BindTexture(TextureTarget.Texture2D, textureId);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)minFilter);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)magFilter);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, texture.Width, texture.Height, 0,
PixelFormat.Bgra, PixelType.UnsignedByte, IntPtr.Zero);
var bmpData = texture.LockBits(new Rectangle(0, 0, texture.Width, texture.Height),
ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, texture.Width, texture.Height, PixelFormat.Bgra,
PixelType.UnsignedByte, bmpData.Scan0);
texture.UnlockBits(bmpData);
GL.BindTexture(TextureTarget.Texture2D, 0);
return(textureId);
}