深度渲染纹理格式。
深度格式用于将高精度“depth”值渲染到渲染纹理。实际使用
哪种格式取决于平台。在 OpenGL 上，将使用原生“depth component”格式
（通常为 24 或 16 位），在 Direct3D9 上，将使用 32 位浮点“R32F”格式。在编写
使用或渲染到深度纹理中的着色器时，必须注意确保它们都
在 OpenGL 和 Direct3D 上工作，请参阅 depth textures documentation。
请注意，并非所有显卡都支持深度纹理。请使用 SystemInfo.SupportsRenderTextureFormat
检查支持情况。
另请参阅：RenderTexture.format、RenderTexture 类、SystemInfo.SupportsRenderTextureFormat。
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