metal_private.hpp

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// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
 
#import <Metal/Metal.h>
 
#include <cstddef>
#include <mutex>
 
namespace tmk::gpu::metal {
 
// One stable, registry-ID-ordered snapshot shared by discovery and field dispatch.
std::size_t device_count();
id<MTLDevice> device_at_index(int index);
 
// Process working-set budget, not free VRAM: currentAllocatedSize excludes other processes.
std::size_t working_set_headroom(id<MTLDevice> device);
 
// Serialize admission and allocation so callers cannot admit against the same headroom.
std::mutex& allocation_mutex();
 
}  // namespace tmk::gpu::metal