渲染纹理深度缓冲区的精度（以位为单位）（支持 0、16、24 和 32）。
深度/模板缓冲区格式中用于深度的最小位数。
根据给定的位数选择的深度/模板缓冲区的实际格式可能会因平台或图形 API 而异。有关决策树的更多信息，请参见其他资源：RenderTexture.depth。其他资源：RenderTexture.depthStencilFormat 返回所选实际格式。
该属性返回所选格式中用于深度的实际位数。如果平台上没有具有相同深度位的格式，那么实际位数可能与所设置的位数不同。
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