Axiom.RenderSystems.OpenGL.GLPixelUtil.GetGLOriginDataType C# (CSharp) Метод

		public static int GetGLOriginDataType( PixelFormat format )
		{
			switch ( format )
			{
				case PixelFormat.A8:
				case PixelFormat.L8:
				case PixelFormat.R8G8B8:
				case PixelFormat.B8G8R8:
				case PixelFormat.BYTE_LA:
					return Gl.GL_UNSIGNED_BYTE;
				case PixelFormat.R3G3B2:
					return Gl.GL_UNSIGNED_BYTE_3_3_2;
				case PixelFormat.A1R5G5B5:
					return Gl.GL_UNSIGNED_SHORT_1_5_5_5_REV;
				case PixelFormat.R5G6B5:
				case PixelFormat.B5G6R5:
					return Gl.GL_UNSIGNED_SHORT_5_6_5;
				case PixelFormat.A4R4G4B4:
					return Gl.GL_UNSIGNED_SHORT_4_4_4_4_REV;
				case PixelFormat.L16:
					return Gl.GL_UNSIGNED_SHORT;
#if !LITTLE_ENDIAN
				case PixelFormat.X8B8G8R8:
				case PixelFormat.A8B8G8R8:
					return Gl.GL_UNSIGNED_INT_8_8_8_8_REV;
				case PixelFormat.X8R8G8B8:
				case PixelFormat.A8R8G8B8:
					return Gl.GL_UNSIGNED_INT_8_8_8_8_REV;
				case PixelFormat.B8G8R8A8:
					return Gl.GL_UNSIGNED_BYTE;
				case PixelFormat.R8G8B8A8:
					return Gl.GL_UNSIGNED_BYTE;
#else
			case PixelFormat.X8B8G8R8:
			case PixelFormat.A8B8G8R8:
                return Gl.GL_UNSIGNED_BYTE;
			case PixelFormat.X8R8G8B8:
            case PixelFormat.A8R8G8B8:
				return Gl.GL_UNSIGNED_BYTE;
            case PixelFormat.B8G8R8A8:
                return Gl.GL_UNSIGNED_INT_8_8_8_8;
			case PixelFormat.R8G8B8A8:
				return Gl.GL_UNSIGNED_INT_8_8_8_8;
#endif
				case PixelFormat.A2R10G10B10:
					return Gl.GL_UNSIGNED_INT_2_10_10_10_REV;
				case PixelFormat.A2B10G10R10:
					return Gl.GL_UNSIGNED_INT_2_10_10_10_REV;
				case PixelFormat.FLOAT16_R:
				//case PixelFormat.FLOAT16_GR:
				case PixelFormat.FLOAT16_RGB:
				case PixelFormat.FLOAT16_RGBA:
					return Gl.GL_HALF_FLOAT_ARB;
				case PixelFormat.FLOAT32_R:
				//case PixelFormat.FLOAT32_GR:
				case PixelFormat.FLOAT32_RGB:
				case PixelFormat.FLOAT32_RGBA:
					return Gl.GL_FLOAT;
				case PixelFormat.SHORT_RGBA:
					//case PixelFormat.SHORT_RGB:
					//case PixelFormat.SHORT_GR:
					return Gl.GL_UNSIGNED_SHORT;
				default:
					return 0;
			}
		}

        public override void CopyContentsToMemory(PixelBox dst, FrameBuffer buffer)
        {
            if ((dst.Left < 0) || (dst.Right > Width) ||
                (dst.Top < 0) || (dst.Bottom > Height) ||
                (dst.Front != 0) || (dst.Back != 1))
            {
                throw new Exception("Invalid box.");
            }
            if (buffer == RenderTarget.FrameBuffer.Auto)
            {
                buffer = IsFullScreen ? RenderTarget.FrameBuffer.Front : RenderTarget.FrameBuffer.Back;
            }

            int format = GLPixelUtil.GetGLOriginFormat(dst.Format);
            int type   = GLPixelUtil.GetGLOriginDataType(dst.Format);

            if ((format == Gl.GL_NONE) || (type == 0))
            {
                throw new Exception("Unsupported format.");
            }


            // Switch context if different from current one
            RenderSystem rsys = Root.Instance.RenderSystem;

            rsys.Viewport = this.GetViewport(0);

            // Must change the packing to ensure no overruns!
            Gl.glPixelStorei(Gl.GL_PACK_ALIGNMENT, 1);

            Gl.glReadBuffer((buffer == RenderTarget.FrameBuffer.Front) ? Gl.GL_FRONT : Gl.GL_BACK);
            Gl.glReadPixels(dst.Left, dst.Top, dst.Width, dst.Height, format, type, dst.Data);

            // restore default alignment
            Gl.glPixelStorei(Gl.GL_PACK_ALIGNMENT, 4);

            //vertical flip

            {
                int    rowSpan = dst.Width * PixelUtil.GetNumElemBytes(dst.Format);
                int    height  = dst.Height;
                byte[] tmpData = new byte[rowSpan * height];
                unsafe
                {
                    var dataPtr = dst.Data.ToBytePointer();
                    //int *srcRow = (uchar *)dst.data, *tmpRow = tmpData + (height - 1) * rowSpan;

                    for (int row = height - 1, tmpRow = 0; row >= 0; row--, tmpRow++)
                    {
                        for (int col = 0; col < rowSpan; col++)
                        {
                            tmpData[tmpRow * rowSpan + col] = dataPtr[row * rowSpan + col];
                        }
                    }
                }
                var tmpDataHandle = BufferBase.Wrap(tmpData);
                Memory.Copy(tmpDataHandle, dst.Data, rowSpan * height);
            }
        }