render directly from mapped vertex buffer

src/au/VkAllocator.zig

@@ -0,0 +1,43 @@
+const std = @import("std");
+const vk = @import("vk");
+const au = @import("../au.zig");
+
+const Self = @This();
+
+props: vk.PhysicalDeviceMemoryProperties,
+
+pub fn init() Self {
+    return .{
+        .props = au.I.getPhysicalDeviceMemoryProperties(au.device_config.pdev),
+    };
+}
+
+pub fn heaps(self: Self) []const vk.MemoryHeap {
+    return self.props.memory_heaps[0..self.props.memory_heap_count];
+}
+
+pub fn types(self: Self) []const vk.MemoryType {
+    return self.props.memory_types[0..self.props.memory_type_count];
+}
+
+pub fn alloc(self: Self, reqs: vk.MemoryRequirements, flags: vk.MemoryPropertyFlags) !vk.DeviceMemory {
+    const memory_type_bits: std.bit_set.IntegerBitSet(vk.MAX_MEMORY_TYPES) = .{
+        .mask = reqs.memory_type_bits,
+    };
+
+    for (self.types(), 0..) |typ, idx| {
+        if (!memory_type_bits.isSet(idx)) continue;
+        if (!typ.property_flags.contains(flags)) continue;
+
+        return try au.D.allocateMemory(&.{
+            .allocation_size = reqs.size,
+            .memory_type_index = @intCast(idx),
+        }, null);
+    }
+
+    return error.NoSuitableMemoryType;
+}
+
+pub fn free(_: Self, memory: vk.DeviceMemory) void {
+    au.D.freeMemory(memory, null);
+}