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fb5ee4cb5c
This command allows the caller to set the base value of `BuiltInWorkgroupId`, and thus of `BuiltInGlobalInvocationId`. Metal provides no direct support for this... but it does provide a builtin, `[[grid_origin]]`, normally used to pass the base values for the stage input region, which we will now abuse to pass the dispatch base and avoid burning a buffer binding. `[[grid_origin]]`, as part of Metal's support for compute stage input, requires MSL 1.2. For 1.0 and 1.1, we're forced to provide a buffer. (Curiously, this builtin was undocumented until the MSL 2.2 release. Go figure.) |
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vulkan |