双通道 (RG) 渲染纹理格式，每个通道 8 位。
请注意，并非所有显卡都支持整数渲染纹理。使用 SystemInfo.SupportsRenderTextureFormat 检查支持情况。
其他资源：RenderTexture 类，SystemInfo.SupportsRenderTextureFormat。
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