颜色渲染纹理格式，每个通道 32 位浮点数。
请注意，并非所有显卡都支持浮点渲染纹理。使用 SystemInfo.SupportsRenderTextureFormat 检查是否支持。
其他资源： RenderTexture 类，SystemInfo.SupportsRenderTextureFormat。
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