允许您为指定平台和着色器硬件层设置 PlatformShaderSettings。
如果调整的平台是活动构建目标，着色器将重新加载，以便您能够立即查看结果。请注意，如果设置为不同层的 PlatformShaderSettings 不相同，则即使缺少 #pragma hardware_tier_variants，也会为着色器生成层变体。
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