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(WIP) refactor gpu allocator selection for vulkan #1417

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(WIP) refactor gpu allocator selection for vulkan #1417

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64 changes: 18 additions & 46 deletions src/sysgpu/vulkan.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -3548,59 +3548,31 @@ const MemoryAllocator = struct {
mem_kind: MemoryKind,
) ?u32 {
const mem_types = mem_alloc.info.memory_types[0..mem_alloc.info.memory_type_count];
const mem_heaps = mem_alloc.info.memory_heaps[0..mem_alloc.info.memory_heap_count];
const property_flags = getMemoryPropertyFlags(mem_kind);

var best_type: ?u32 = null;
for (mem_types, 0..) |mem_type, i| {
if (requirements.memory_type_bits & (@as(u32, @intCast(1)) << @intCast(i)) == 0) continue;
const is_compatible = (requirements.memory_type_bits & (@as(u32, 1) << @truncate(i))) != 0;
if (!is_compatible) continue;

const flags = mem_type.property_flags;
const heap_size = mem_heaps[mem_type.heap_index].size;
const candidate = switch (mem_kind) {
.lazily_allocated => flags.lazily_allocated_bit,
.linear_write_mappable => flags.host_visible_bit and flags.host_coherent_bit and !flags.device_coherent_bit_amd,
.linear_read_mappable => blk: {
if (flags.host_visible_bit and flags.host_coherent_bit and !flags.device_coherent_bit_amd) {
if (best_type) |best| {
if (mem_types[best].property_flags.host_cached_bit) {
if (flags.host_cached_bit) {
const best_heap_size = mem_heaps[mem_types[best].heap_index].size;
if (heap_size > best_heap_size) {
break :blk true;
}
}

break :blk false;
}
}

break :blk true;
}

break :blk false;
},
.linear => blk: {
if (best_type) |best| {
if (mem_types[best].property_flags.device_local_bit) {
if (flags.device_local_bit and !flags.device_coherent_bit_amd) {
const best_heap_size = mem_heaps[mem_types[best].heap_index].size;
if (heap_size > best_heap_size or flags.host_visible_bit) {
break :blk true;
}
}

break :blk false;
}
}
if (flags != property_flags) continue;

break :blk true;
},
};

if (candidate) best_type = @intCast(i);
return @intCast(i);
}

return best_type;
return 0;
}

fn getMemoryPropertyFlags(mem_kind: MemoryKind) vk.MemoryPropertyFlags {
return switch (mem_kind) {
.lazily_allocated => vk.MemoryPropertyFlags{ .lazily_allocated_bit = true },
.linear => vk.MemoryPropertyFlags{ .device_local_bit = true },
.linear_read_mappable => vk.MemoryPropertyFlags{ .host_visible_bit = true },
.linear_write_mappable => vk.MemoryPropertyFlags{
.host_visible_bit = true,
.host_coherent_bit = true,
},
};
}
};

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