architectural rework

src/vulkan/lib.zig

@@ -6,8 +6,10 @@ pub const dispatchable = @import("dispatchable.zig");
 
 pub const Instance = @import("Instance.zig");
 pub const PhysicalDevice = @import("PhysicalDevice.zig");
+pub const VulkanAllocator = @import("VulkanAllocator.zig");
 
 pub const VULKAN_VENDOR_ID = @typeInfo(vk.VendorId).@"enum".fields[@typeInfo(vk.VendorId).@"enum".fields.len - 1].value + 1;
+pub const DRIVER_LOGS_ENV_NAME = "DRIVER_LOGS";
 
 pub const std_options: std.Options = .{
     .log_level = .info,
@@ -23,6 +25,29 @@ pub fn logFn(comptime level: std.log.Level, comptime scope: @Type(.enum_literal)
     nosuspend stderr.print(format ++ "\n", args) catch return;
 }
 
+pub fn retrieveDriverDataAs(handle: anytype, comptime T: type) !*T {
+    comptime {
+        switch (@typeInfo(@TypeOf(handle))) {
+            .pointer => |p| std.debug.assert(@hasField(p.child, "driver_data")),
+            else => @compileError("Invalid type passed to 'retrieveDriverDataAs': " ++ @typeName(@TypeOf(handle))),
+        }
+    }
+    return @ptrCast(@alignCast(@field(handle, "driver_data")));
+}
+
+const global_pfn_map = std.StaticStringMap(vk.PfnVoidFunction).initComptime(.{
+    .{ "vkGetInstanceProcAddr", @as(vk.PfnVoidFunction, @ptrCast(&icd.getInstanceProcAddr)) },
+    .{ "vkCreateInstance", @as(vk.PfnVoidFunction, @ptrCast(&Instance.create)) },
+});
+
+pub export fn vkGetInstanceProcAddr(p_instance: vk.Instance, pName: ?[*:0]const u8) callconv(vk.vulkan_call_conv) vk.PfnVoidFunction {
+    if (pName == null) {
+        return null;
+    }
+    const name = std.mem.span(pName.?);
+    return icd.getInstanceProcAddr(global_pfn_map, p_instance, name);
+}
+
 test {
     std.testing.refAllDeclsRecursive(@This());
 }