WIP rewriting generator for learning purposes

Update zig

build.zig.zon

@@ -2,7 +2,7 @@
     .name = .vulkan,
     .fingerprint = 0xbe155a03c72db6af,
     .version = "0.0.0",
-    .minimum_zig_version = "0.14.0-dev.1359+e9a00ba7f",
+    .minimum_zig_version = "0.15.1",
     .paths = .{
         "build.zig",
         "LICENSE",

examples/graphics_context.zig

@@ -35,6 +35,7 @@ pub const GraphicsContext = struct {
     vkb: BaseWrapper,
 
     instance: Instance,
+    debug_messenger: vk.DebugUtilsMessengerEXT,
     surface: vk.SurfaceKHR,
     pdev: vk.PhysicalDevice,
     props: vk.PhysicalDeviceProperties,
@@ -49,16 +50,17 @@ pub const GraphicsContext = struct {
         self.allocator = allocator;
         self.vkb = BaseWrapper.load(c.glfwGetInstanceProcAddress);
 
-        var extension_names = std.ArrayList([*:0]const u8).init(allocator);
-        defer extension_names.deinit();
-        // these extensions are to support vulkan in mac os
+        var extension_names: std.ArrayList([*:0]const u8) = .empty;
+        defer extension_names.deinit(allocator);
+        try extension_names.append(allocator, vk.extensions.ext_debug_utils.name);
+        // the following extensions are to support vulkan in mac os
         // see https://github.com/glfw/glfw/issues/2335
-        try extension_names.append("VK_KHR_portability_enumeration");
-        try extension_names.append("VK_KHR_get_physical_device_properties2");
+        try extension_names.append(allocator, vk.extensions.khr_portability_enumeration.name);
+        try extension_names.append(allocator, vk.extensions.khr_get_physical_device_properties_2.name);
 
         var glfw_exts_count: u32 = 0;
         const glfw_exts = c.glfwGetRequiredInstanceExtensions(&glfw_exts_count);
-        try extension_names.appendSlice(@ptrCast(glfw_exts[0..glfw_exts_count]));
+        try extension_names.appendSlice(allocator, @ptrCast(glfw_exts[0..glfw_exts_count]));
 
         const instance = try self.vkb.createInstance(&.{
             .p_application_info = &.{
@@ -81,6 +83,22 @@ pub const GraphicsContext = struct {
         self.instance = Instance.init(instance, vki);
         errdefer self.instance.destroyInstance(null);
 
+        self.debug_messenger = try self.instance.createDebugUtilsMessengerEXT(&.{
+            .message_severity = .{
+                //.verbose_bit_ext = true,
+                //.info_bit_ext = true,
+                .warning_bit_ext = true,
+                .error_bit_ext = true,
+            },
+            .message_type = .{
+                .general_bit_ext = true,
+                .validation_bit_ext = true,
+                .performance_bit_ext = true,
+            },
+            .pfn_user_callback = &debugUtilsMessengerCallback,
+            .p_user_data = null,
+        }, null);
+
         self.surface = try createSurface(self.instance, window);
         errdefer self.instance.destroySurfaceKHR(self.surface, null);
 
@@ -107,6 +125,7 @@ pub const GraphicsContext = struct {
     pub fn deinit(self: GraphicsContext) void {
         self.dev.destroyDevice(null);
         self.instance.destroySurfaceKHR(self.surface, null);
+        self.instance.destroyDebugUtilsMessengerEXT(self.debug_messenger, null);
         self.instance.destroyInstance(null);
 
         // Don't forget to free the tables to prevent a memory leak.
@@ -196,6 +215,17 @@ const QueueAllocation = struct {
     present_family: u32,
 };
 
+fn debugUtilsMessengerCallback(severity: vk.DebugUtilsMessageSeverityFlagsEXT, msg_type: vk.DebugUtilsMessageTypeFlagsEXT, callback_data: ?*const vk.DebugUtilsMessengerCallbackDataEXT, _: ?*anyopaque) callconv(.c) vk.Bool32 {
+    const severity_str = if (severity.verbose_bit_ext) "verbose" else if (severity.info_bit_ext) "info" else if (severity.warning_bit_ext) "warning" else if (severity.error_bit_ext) "error" else "unknown";
+
+    const type_str = if (msg_type.general_bit_ext) "general" else if (msg_type.validation_bit_ext) "validation" else if (msg_type.performance_bit_ext) "performance" else if (msg_type.device_address_binding_bit_ext) "device addr" else "unknown";
+
+    const message: [*c]const u8 = if (callback_data) |cb_data| cb_data.p_message else "NO MESSAGE!";
+    std.debug.print("[{s}][{s}]. Message:\n  {s}\n", .{ severity_str, type_str, message });
+
+    return .false;
+}
+
 fn pickPhysicalDevice(
     instance: Instance,
     allocator: Allocator,
@@ -253,7 +283,7 @@ fn allocateQueues(instance: Instance, pdev: vk.PhysicalDevice, allocator: Alloca
             graphics_family = family;
         }
 
-        if (present_family == null and (try instance.getPhysicalDeviceSurfaceSupportKHR(pdev, family, surface)) == vk.TRUE) {
+        if (present_family == null and (try instance.getPhysicalDeviceSurfaceSupportKHR(pdev, family, surface)) == .true) {
             present_family = family;
         }
     }

examples/swapchain.zig

@@ -60,7 +60,7 @@ pub const Swapchain = struct {
             .pre_transform = caps.current_transform,
             .composite_alpha = .{ .opaque_bit_khr = true },
             .present_mode = present_mode,
-            .clipped = vk.TRUE,
+            .clipped = .true,
             .old_swapchain = old_handle,
         }, null) catch {
             return error.SwapchainCreationFailed;
@@ -261,7 +261,7 @@ const SwapImage = struct {
     }
 
     fn waitForFence(self: SwapImage, gc: *const GraphicsContext) !void {
-        _ = try gc.dev.waitForFences(1, @ptrCast(&self.frame_fence), vk.TRUE, std.math.maxInt(u64));
+        _ = try gc.dev.waitForFences(1, @ptrCast(&self.frame_fence), .true, std.math.maxInt(u64));
     }
 };
 

examples/triangle.zig

@@ -414,7 +414,7 @@ fn createPipeline(
 
     const piasci = vk.PipelineInputAssemblyStateCreateInfo{
         .topology = .triangle_list,
-        .primitive_restart_enable = vk.FALSE,
+        .primitive_restart_enable = .false,
     };
 
     const pvsci = vk.PipelineViewportStateCreateInfo{
@@ -425,12 +425,12 @@ fn createPipeline(
     };
 
     const prsci = vk.PipelineRasterizationStateCreateInfo{
-        .depth_clamp_enable = vk.FALSE,
-        .rasterizer_discard_enable = vk.FALSE,
+        .depth_clamp_enable = .false,
+        .rasterizer_discard_enable = .false,
         .polygon_mode = .fill,
         .cull_mode = .{ .back_bit = true },
         .front_face = .clockwise,
-        .depth_bias_enable = vk.FALSE,
+        .depth_bias_enable = .false,
         .depth_bias_constant_factor = 0,
         .depth_bias_clamp = 0,
         .depth_bias_slope_factor = 0,
@@ -439,14 +439,14 @@ fn createPipeline(
 
     const pmsci = vk.PipelineMultisampleStateCreateInfo{
         .rasterization_samples = .{ .@"1_bit" = true },
-        .sample_shading_enable = vk.FALSE,
+        .sample_shading_enable = .false,
         .min_sample_shading = 1,
-        .alpha_to_coverage_enable = vk.FALSE,
-        .alpha_to_one_enable = vk.FALSE,
+        .alpha_to_coverage_enable = .false,
+        .alpha_to_one_enable = .false,
     };
 
     const pcbas = vk.PipelineColorBlendAttachmentState{
-        .blend_enable = vk.FALSE,
+        .blend_enable = .false,
         .src_color_blend_factor = .one,
         .dst_color_blend_factor = .zero,
         .color_blend_op = .add,
@@ -457,7 +457,7 @@ fn createPipeline(
     };
 
     const pcbsci = vk.PipelineColorBlendStateCreateInfo{
-        .logic_op_enable = vk.FALSE,
+        .logic_op_enable = .false,
         .logic_op = .copy,
         .attachment_count = 1,
         .p_attachments = @ptrCast(&pcbas),

src/id_render.zig

@@ -52,7 +52,7 @@ pub fn isZigPrimitiveType(name: []const u8) bool {
     return false;
 }
 
-pub fn writeIdentifier(w: *std.io.Writer, id: []const u8) !void {
+pub fn writeIdentifier(w: *std.Io.Writer, id: []const u8) !void {
     try w.print("{f}", .{std.zig.fmtId(id)});
 }
 
@@ -121,12 +121,12 @@ pub const SegmentIterator = struct {
 
 pub const IdRenderer = struct {
     tags: []const []const u8,
-    text_cache: std.ArrayList(u8),
+    text_cache: std.Io.Writer.Allocating,
 
     pub fn init(allocator: Allocator, tags: []const []const u8) IdRenderer {
         return .{
             .tags = tags,
-            .text_cache = std.ArrayList(u8).init(allocator),
+            .text_cache = .init(allocator),
         };
     }
 
@@ -142,19 +142,19 @@ pub const IdRenderer = struct {
             if (first) {
                 first = false;
             } else {
-                try self.text_cache.append('_');
+                try self.text_cache.writer.writeByte('_');
             }
 
             for (segment) |c| {
-                try self.text_cache.append(if (screaming) std.ascii.toUpper(c) else std.ascii.toLower(c));
+                try self.text_cache.writer.writeByte(if (screaming) std.ascii.toUpper(c) else std.ascii.toLower(c));
             }
         }
 
         if (tag) |name| {
-            try self.text_cache.append('_');
+            try self.text_cache.writer.writeByte('_');
 
             for (name) |c| {
-                try self.text_cache.append(if (screaming) std.ascii.toUpper(c) else std.ascii.toLower(c));
+                try self.text_cache.writer.writeByte(if (screaming) std.ascii.toUpper(c) else std.ascii.toLower(c));
             }
         }
     }
@@ -166,7 +166,7 @@ pub const IdRenderer = struct {
         while (it.next()) |segment| {
             var i: usize = 0;
             while (i < segment.len and std.ascii.isDigit(segment[i])) {
-                try self.text_cache.append(segment[i]);
+                try self.text_cache.writer.writeByte(segment[i]);
                 i += 1;
             }
 
@@ -175,26 +175,26 @@ pub const IdRenderer = struct {
             }
 
             if (i == 0 and lower_first) {
-                try self.text_cache.append(std.ascii.toLower(segment[i]));
+                try self.text_cache.writer.writeByte(std.ascii.toLower(segment[i]));
             } else {
-                try self.text_cache.append(std.ascii.toUpper(segment[i]));
+                try self.text_cache.writer.writeByte(std.ascii.toUpper(segment[i]));
             }
             lower_first = false;
 
             for (segment[i + 1 ..]) |c| {
-                try self.text_cache.append(std.ascii.toLower(c));
+                try self.text_cache.writer.writeByte(std.ascii.toLower(c));
             }
         }
 
         if (tag) |name| {
-            try self.text_cache.appendSlice(name);
+            try self.text_cache.writer.writeAll(name);
         }
     }
 
     pub fn renderFmt(self: *IdRenderer, out: *std.Io.Writer, comptime fmt: []const u8, args: anytype) !void {
-        self.text_cache.items.len = 0;
-        try std.fmt.format(self.text_cache.writer(), fmt, args);
-        try writeIdentifier(out, self.text_cache.items);
+        _ = self.text_cache.writer.consumeAll();
+        try self.text_cache.writer.print(fmt, args);
+        try writeIdentifier(out, self.text_cache.writer.buffered());
     }
 
     pub fn renderWithCase(self: *IdRenderer, out: *std.Io.Writer, case_style: CaseStyle, id: []const u8) !void {
@@ -202,7 +202,7 @@ pub const IdRenderer = struct {
         // The trailing underscore doesn't need to be removed here as its removed by the SegmentIterator.
         const adjusted_id = if (tag) |name| id[0 .. id.len - name.len] else id;
 
-        self.text_cache.items.len = 0;
+        _ = self.text_cache.writer.consumeAll();
 
         switch (case_style) {
             .snake => try self.renderSnake(false, adjusted_id, tag),
@@ -211,7 +211,7 @@ pub const IdRenderer = struct {
             .camel => try self.renderCamel(false, adjusted_id, tag),
         }
 
-        try writeIdentifier(out, self.text_cache.items);
+        try writeIdentifier(out, self.text_cache.writer.buffered());
     }
 
     pub fn getAuthorTag(self: IdRenderer, id: []const u8) ?[]const u8 {

src/main.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+
 const generator = @import("vulkan/generator.zig");
 
 fn invalidUsage(prog_name: []const u8, comptime fmt: []const u8, args: anytype) noreturn {
@@ -21,6 +22,11 @@ fn reportParseErrors(tree: std.zig.Ast) !void {
         }
         try w.writeAll("^\n");
     }
+    try w.flush();
+}
+
+fn oomPanic() noreturn {
+    @panic("Out of memory");
 }
 
 pub fn main() !void {
@@ -29,7 +35,7 @@ pub fn main() !void {
     const allocator = arena.allocator();
 
     var args = std.process.argsWithAllocator(allocator) catch |err| switch (err) {
-        error.OutOfMemory => @panic("OOM"),
+        error.OutOfMemory => oomPanic(),
     };
     const prog_name = args.next() orelse "vulkan-zig-generator";
 
@@ -65,6 +71,9 @@ pub fn main() !void {
             ) catch |err| {
                 std.process.fatal("failed to write to stdout: {s}", .{@errorName(err)});
             };
+            w.interface.flush() catch |err| {
+                std.process.fatal("failed to flush stdout: {s}", .{@errorName(err)});
+            };
             return;
         } else if (std.mem.eql(u8, arg, "-a") or std.mem.eql(u8, arg, "--api")) {
             const api_str = args.next() orelse {
@@ -97,20 +106,19 @@ pub fn main() !void {
     };
 
     const cwd = std.fs.cwd();
-    const xml_src = cwd.readFileAlloc(allocator, xml_path, std.math.maxInt(usize)) catch |err| {
+    const xml_src = cwd.readFileAlloc(xml_path, allocator, .unlimited) catch |err| {
         std.process.fatal("failed to open input file '{s}' ({s})", .{ xml_path, @errorName(err) });
     };
 
     const maybe_video_xml_src = if (maybe_video_xml_path) |video_xml_path|
-        cwd.readFileAlloc(allocator, video_xml_path, std.math.maxInt(usize)) catch |err| {
+        cwd.readFileAlloc(video_xml_path, allocator, .unlimited) catch |err| {
             std.process.fatal("failed to open input file '{s}' ({s})", .{ video_xml_path, @errorName(err) });
         }
     else
         null;
 
-    var out_buffer = std.ArrayList(u8).init(allocator);
-    var w = out_buffer.writer().adaptToNewApi();
-    generator.generate(allocator, api, xml_src, maybe_video_xml_src, &w.new_interface) catch |err| {
+    var aw: std.Io.Writer.Allocating = .init(allocator);
+    generator.generate(allocator, api, xml_src, maybe_video_xml_src, &aw.writer) catch |err| {
         if (debug) {
             return err;
         }
@@ -132,15 +140,16 @@ pub fn main() !void {
                 std.log.err("please make a bug report at https://github.com/Snektron/vulkan-zig/issues/", .{});
                 std.process.exit(1);
             },
-            error.OutOfMemory, error.WriteFailed => @panic("oom"),
+            error.OutOfMemory, error.WriteFailed => oomPanic(),
         }
     };
 
-    out_buffer.append(0) catch @panic("oom");
+    aw.writer.writeByte(0) catch oomPanic();
 
-    const src = out_buffer.items[0 .. out_buffer.items.len - 1 :0];
+    const buffered = aw.writer.buffered();
+    const src = buffered[0 .. buffered.len - 1 :0];
     const tree = std.zig.Ast.parse(allocator, src, .zig) catch |err| switch (err) {
-        error.OutOfMemory => @panic("oom"),
+        error.OutOfMemory => oomPanic(),
     };
 
     const formatted = if (tree.errors.len > 0) blk: {
@@ -158,7 +167,7 @@ pub fn main() !void {
         }
         std.process.exit(1);
     } else tree.renderAlloc(allocator) catch |err| switch (err) {
-        error.OutOfMemory => @panic("oom"),
+        error.OutOfMemory => oomPanic(),
     };
 
     if (std.fs.path.dirname(out_path)) |dir| {

src/vulkan/c_parse.zig

@@ -457,8 +457,8 @@ fn parseFnPtrSuffix(allocator: Allocator, xctok: *XmlCTokenizer, return_type: Ty
     // There is no good way to estimate the number of parameters beforehand.
     // Fortunately, there are usually a relatively low number of parameters to a function pointer,
     // so an ArrayList backed by an arena allocator is good enough.
-    var params = std.ArrayList(registry.Command.Param).init(allocator);
-    try params.append(.{
+    var params: std.ArrayList(registry.Command.Param) = .empty;
+    try params.append(allocator, .{
         .name = first_param.name.?,
         .param_type = first_param.decl_type,
         .is_buffer_len = false,
@@ -473,7 +473,7 @@ fn parseFnPtrSuffix(allocator: Allocator, xctok: *XmlCTokenizer, return_type: Ty
         }
 
         const decl = try parseDeclaration(allocator, xctok, ptrs_optional);
-        try params.append(.{
+        try params.append(allocator, .{
             .name = decl.name orelse return error.MissingTypeIdentifier,
             .param_type = decl.decl_type,
             .is_buffer_len = false,
@@ -482,7 +482,7 @@ fn parseFnPtrSuffix(allocator: Allocator, xctok: *XmlCTokenizer, return_type: Ty
     }
 
     _ = try xctok.nextNoEof();
-    command_ptr.decl_type.command_ptr.params = try params.toOwnedSlice();
+    command_ptr.decl_type.command_ptr.params = try params.toOwnedSlice(allocator);
     return command_ptr;
 }
 

src/vulkan/generator.zig

@@ -32,7 +32,7 @@ const EnumFieldMerger = struct {
     fn putEnumExtension(self: *EnumFieldMerger, enum_name: []const u8, field: reg.Enum.Field) !void {
         const res = try self.enum_extensions.getOrPut(self.arena, enum_name);
         if (!res.found_existing) {
-            res.value_ptr.* = std.ArrayListUnmanaged(reg.Enum.Field){};
+            res.value_ptr.* = .empty;
         }
 
         try res.value_ptr.append(self.arena, field);

src/vulkan/parse.zig

@@ -28,11 +28,11 @@ pub fn parseXml(
 
     const allocator = arena.allocator();
 
-    var decls: std.ArrayListUnmanaged(registry.Declaration) = .{};
-    var api_constants: std.ArrayListUnmanaged(registry.ApiConstant) = .{};
-    var tags: std.ArrayListUnmanaged(registry.Tag) = .{};
-    var features: std.ArrayListUnmanaged(registry.Feature) = .{};
-    var extensions: std.ArrayListUnmanaged(registry.Extension) = .{};
+    var decls: std.ArrayList(registry.Declaration) = .empty;
+    var api_constants: std.ArrayList(registry.ApiConstant) = .empty;
+    var tags: std.ArrayList(registry.Tag) = .empty;
+    var features: std.ArrayList(registry.Feature) = .empty;
+    var extensions: std.ArrayList(registry.Extension) = .empty;
 
     try parseDeclarations(allocator, root, api, &decls);
     try parseApiConstants(allocator, root, api, &api_constants);
@@ -66,7 +66,7 @@ fn parseDeclarations(
     allocator: Allocator,
     root: *xml.Element,
     api: registry.Api,
-    decls: *std.ArrayListUnmanaged(registry.Declaration),
+    decls: *std.ArrayList(registry.Declaration),
 ) !void {
     const types_elem = root.findChildByTag("types") orelse return error.InvalidRegistry;
     try decls.ensureUnusedCapacity(allocator, types_elem.children.len);
@@ -84,7 +84,7 @@ fn parseTypes(
     allocator: Allocator,
     types_elem: *xml.Element,
     api: registry.Api,
-    decls: *std.ArrayListUnmanaged(registry.Declaration),
+    decls: *std.ArrayList(registry.Declaration),
 ) !void {
     var it = types_elem.findChildrenByTag("type");
     while (it.next()) |ty| {
@@ -429,7 +429,7 @@ fn parseEnums(
     allocator: Allocator,
     root: *xml.Element,
     api: registry.Api,
-    decls: *std.ArrayListUnmanaged(registry.Declaration),
+    decls: *std.ArrayList(registry.Declaration),
 ) !void {
     var it = root.findChildrenByTag("enums");
     while (it.next()) |enums| {
@@ -519,7 +519,7 @@ fn parseCommands(
     allocator: Allocator,
     commands_elem: *xml.Element,
     api: registry.Api,
-    decls: *std.ArrayListUnmanaged(registry.Declaration),
+    decls: *std.ArrayList(registry.Declaration),
 ) !void {
     var it = commands_elem.findChildrenByTag("command");
     while (it.next()) |elem| {
@@ -630,7 +630,7 @@ fn parseApiConstants(
     allocator: Allocator,
     root: *xml.Element,
     api: registry.Api,
-    api_constants: *std.ArrayListUnmanaged(registry.ApiConstant),
+    api_constants: *std.ArrayList(registry.ApiConstant),
 ) !void {
     const maybe_enums = blk: {
         var it = root.findChildrenByTag("enums");
@@ -672,7 +672,7 @@ fn parseDefines(
     allocator: Allocator,
     types: *xml.Element,
     api: registry.Api,
-    api_constants: *std.ArrayListUnmanaged(registry.ApiConstant),
+    api_constants: *std.ArrayList(registry.ApiConstant),
 ) !void {
     var it = types.findChildrenByTag("type");
     while (it.next()) |ty| {
@@ -703,7 +703,7 @@ fn parseDefines(
 fn parseTags(
     allocator: Allocator,
     root: *xml.Element,
-    tags: *std.ArrayListUnmanaged(registry.Tag),
+    tags: *std.ArrayList(registry.Tag),
 ) !void {
     var tags_elem = root.findChildByTag("tags") orelse return;
     try tags.ensureUnusedCapacity(allocator, tags_elem.children.len);
@@ -717,7 +717,7 @@ fn parseTags(
     }
 }
 
-fn parseFeatures(allocator: Allocator, root: *xml.Element, api: registry.Api, features: *std.ArrayListUnmanaged(registry.Feature)) !void {
+fn parseFeatures(allocator: Allocator, root: *xml.Element, api: registry.Api, features: *std.ArrayList(registry.Feature)) !void {
     var it = root.findChildrenByTag("feature");
     while (it.next()) |feature| {
         if (!requiredByApi(feature, api))
@@ -881,7 +881,7 @@ fn parseExtensions(
     allocator: Allocator,
     root: *xml.Element,
     api: registry.Api,
-    extensions: *std.ArrayListUnmanaged(registry.Extension),
+    extensions: *std.ArrayList(registry.Extension),
 ) !void {
     const extensions_elem = root.findChildByTag("extensions") orelse return error.InvalidRegistry;
     try extensions.ensureUnusedCapacity(allocator, extensions_elem.children.len);

src/vulkan/render.zig

@@ -1,11 +1,12 @@
 const std = @import("std");
-const reg = @import("registry.zig");
-const id_render = @import("../id_render.zig");
-const cparse = @import("c_parse.zig");
 const mem = std.mem;
 const Allocator = mem.Allocator;
+
+const id_render = @import("../id_render.zig");
 const CaseStyle = id_render.CaseStyle;
 const IdRenderer = id_render.IdRenderer;
+const cparse = @import("c_parse.zig");
+const reg = @import("registry.zig");
 
 const preamble =
     \\// This file is generated from the Khronos Vulkan XML API registry by vulkan-zig.
@@ -18,7 +19,7 @@ const preamble =
     \\
     \\pub const vulkan_call_conv: std.builtin.CallingConvention = if (builtin.os.tag == .windows and builtin.cpu.arch == .x86)
     \\        .winapi
-    \\    else if (builtin.abi == .android and (builtin.cpu.arch.isARM() or builtin.cpu.arch.isThumb()) and std.Target.arm.featureSetHas(builtin.cpu.features, .has_v7) and builtin.cpu.arch.ptrBitWidth() == 32)
+    \\    else if (builtin.abi == .android and (builtin.cpu.arch.isArm() or builtin.cpu.arch.isThumb()) and std.Target.arm.featureSetHas(builtin.cpu.features, .has_v7) and builtin.cpu.arch.ptrBitWidth() == 32)
     \\        // On Android 32-bit ARM targets, Vulkan functions use the "hardfloat"
     \\        // calling convention, i.e. float parameters are passed in registers. This
     \\        // is true even if the rest of the application passes floats on the stack,
@@ -58,8 +59,6 @@ const preamble =
     \\    return struct {
     \\        pub fn format(
     \\            self: FlagsType,
-    \\            comptime _: []const u8,
-    \\            _: std.fmt.FormatOptions,
     \\            writer: anytype,
     \\        ) !void {
     \\            try writer.writeAll(@typeName(FlagsType) ++ "{");
@@ -336,6 +335,194 @@ pub fn trimVkNamespace(id: []const u8) []const u8 {
     return id;
 }
 
+const Renderer2 = struct {
+    const Self = @This();
+
+    writer: *std.Io.Writer,
+    allocator: Allocator,
+    registry: *const reg.Registry,
+    id_renderer: *IdRenderer,
+    // decls_by_name: std.StringArrayHashMap(reg.DeclarationType),
+    // structure_types: std.StringHashMap(void),
+    have_video: bool,
+
+    fn init(
+        writer: *std.Io.Writer,
+        allocator: Allocator,
+        registry: *const reg.Registry,
+        id_renderer: *IdRenderer,
+        have_video: bool,
+    ) !Self {
+        return Self{
+            .writer = writer,
+            .allocator = allocator,
+            .registry = registry,
+            .id_renderer = id_renderer,
+            // .decls_by_name = decls_by_name,
+            // .structure_types = structure_types,
+            .have_video = have_video,
+        };
+    }
+
+    fn deinit(self: *Self) void {
+        _ = self; // autofix
+        // self.decls_by_name.deinit();
+    }
+
+    pub const Error = error{
+        UnhandledBitfieldStruct,
+        InvalidApiConstant,
+        InvalidConstantExpr,
+        InvalidRegistry,
+        UnexpectedCharacter,
+        InvalidCharacter,
+        Overflow,
+        OutOfMemory,
+        WriteFailed,
+    };
+
+    fn render(self: *Self) Error!void {
+        try self.renderDecls();
+    }
+
+    fn text(self: *Self, str: []const u8) Error!void {
+        try self.writer.writeAll(str);
+    }
+
+    fn print(self: *Self, comptime fmt: []const u8, args: anytype) Error!void {
+        try self.writer.print(fmt, args);
+    }
+
+    fn idWithCase(self: *Self, case: CaseStyle, id: []const u8) Error!void {
+        try self.id_renderer.renderWithCase(self.writer, case, id);
+    }
+
+    const _reserved_names = std.StaticStringMap([]const u8).initComptime(.{
+        .{ "void", "void" },
+        .{ "char", "u8" },
+        .{ "float", "f32" },
+        .{ "double", "f64" },
+        .{ "uint8_t", "u8" },
+        .{ "int8_t", "i8" },
+        .{ "int16_t", "i16" },
+        .{ "uint16_t", "u16" },
+        .{ "uint32_t", "u32" },
+        .{ "uint64_t", "u64" },
+        .{ "int32_t", "i32" },
+        .{ "int64_t", "i64" },
+        .{ "size_t", "usize" },
+        .{ "int", "c_int" },
+    });
+
+    fn renderDecls(self: *Self) Error!void {
+        var arena = std.heap.ArenaAllocator.init(self.allocator);
+        defer arena.deinit();
+
+        for (self.registry.decls) |decl| {
+            defer _ = arena.reset(.retain_capacity);
+
+            switch (decl.decl_type) {
+                .alias => |alias| {
+                    switch (alias.target) {
+                        .other_command => try self.print("pub const Pfn{s} = Pfn{s};\n", .{
+                            trimVkNamespace(decl.name),
+                            trimVkNamespace(alias.name),
+                        }),
+                        .other_type => try self.print("pub const {s} = {s};\n", .{
+                            trimVkNamespace(decl.name),
+                            trimVkNamespace(alias.name),
+                        }),
+                    }
+                },
+                .handle => |handle| {
+                    const backing_int = if (handle.is_dispatchable) "usize" else "u32";
+                    try self.print("pub const {s} = enum({s}) {{ null_handle = 0, _ }}; // parent {?s}\n", .{
+                        trimVkNamespace(decl.name),
+                        backing_int,
+                        handle.parent,
+                    });
+                },
+                .typedef => |typ| {
+                    try self.text("pub const ");
+                    if (typ == .command_ptr) {
+                        try self.text("Pfn");
+                    }
+                    try self.text(trimVkNamespace(decl.name));
+                    try self.text(" = ");
+                    try self.typeInfo(typ);
+                    try self.text(";\n");
+                },
+                .foreign => |frn| {
+                    if (_reserved_names.has(decl.name)) continue;
+                    try self.print("pub const {s} = opaque {{}};", .{trimVkNamespace(decl.name)});
+                    if (frn.depends.len > 0) {
+                        try self.print(" // requires \"{s}\"", .{frn.depends});
+                    }
+                    try self.text("\n");
+                },
+                .command => |cmd| {
+                    try self.text("pub const Pfn");
+                    try self.idWithCase(.title, trimVkNamespace(decl.name));
+                    try self.text(" = *const ");
+                    try self.commandType(cmd);
+                    try self.text(";\n");
+                },
+                else => try self.print("pub const {s} = undefined; // {s};\n", .{
+                    trimVkNamespace(decl.name),
+                    @tagName(decl.decl_type),
+                }),
+            }
+        }
+    }
+
+    fn commandType(self: *Self, cmd: reg.Command) Error!void {
+        try self.text("fn(");
+        for (cmd.params, 0..) |param, idx| {
+            if (idx > 0) try self.text(", ");
+            try self.idWithCase(.snake, param.name);
+            try self.text(": ");
+            try self.typeInfo(param.param_type);
+        }
+        try self.text(") void");
+    }
+
+    fn typeInfo(self: *Self, typ: reg.TypeInfo) Error!void {
+        switch (typ) {
+            .name => |name| {
+                if (_reserved_names.get(name)) |real| {
+                    try self.text(real);
+                } else {
+                    try self.text(trimVkNamespace(name));
+                }
+            },
+            .command_ptr => |cmd| {
+                try self.text("?*const ");
+                try self.commandType(cmd);
+            },
+            .pointer => |ptr| {
+                if (ptr.is_optional) try self.text("?");
+                switch (ptr.size) {
+                    .one => try self.text("*"),
+                    .many, .other_field => try self.text("[*]"),
+                    .zero_terminated => try self.text("[*:0]"),
+                }
+                if (ptr.is_const) try self.text("const ");
+                try self.typeInfo(ptr.child.*);
+            },
+            .array => |arr| {
+                if (arr.is_optional) try self.text("?");
+                try self.text("[");
+                switch (arr.size) {
+                    .int => |size| try self.print("{}", .{size}),
+                    .alias => |_| @panic("Not implemented."),
+                }
+                try self.text("]");
+                try self.typeInfo(arr.child.*);
+            },
+        }
+    }
+};
+
 const Renderer = struct {
     const Self = @This();
     const RenderTypeInfoError = std.Io.Writer.Error || std.fmt.ParseIntError || error{ OutOfMemory, InvalidRegistry };
@@ -849,6 +1036,10 @@ const Renderer = struct {
     }
 
     fn renderDecl(self: *Self, decl: reg.Declaration) !void {
+        if (try self.renderSpecial(decl.name)) {
+            return;
+        }
+
         switch (decl.decl_type) {
             .container => |container| try self.renderContainer(decl.name, container),
             .enumeration => |enumeration| try self.renderEnumeration(decl.name, enumeration),
@@ -862,10 +1053,27 @@ const Renderer = struct {
         }
     }
 
-    fn renderSpecialContainer(self: *Self, name: []const u8) !bool {
+    fn renderAssign(self: *Self, name: []const u8) !void {
+        try self.writer.writeAll("pub const ");
+        try self.renderName(name);
+        try self.writer.writeAll(" = ");
+    }
+
+    fn renderSpecial(self: *Self, name: []const u8) !bool {
         const maybe_author = self.id_renderer.getAuthorTag(name);
         const basename = self.id_renderer.stripAuthorTag(name);
-        if (std.mem.eql(u8, basename, "VkAccelerationStructureInstance")) {
+        if (std.mem.eql(u8, basename, "VkBool32")) {
+            try self.renderAssign(name);
+            try self.writer.writeAll(
+                \\enum(i32) {
+                \\    false,
+                \\    true,
+                \\    _,
+                \\};
+                \\
+            );
+        } else if (std.mem.eql(u8, basename, "VkAccelerationStructureInstance")) {
+            try self.renderAssign(name);
             try self.writer.print(
                 \\extern struct {{
                 \\    transform: TransformMatrix{s},
@@ -883,8 +1091,8 @@ const Renderer = struct {
             ,
                 .{maybe_author orelse ""},
             );
-            return true;
         } else if (std.mem.eql(u8, basename, "VkAccelerationStructureSRTMotionInstance")) {
+            try self.renderAssign(name);
             try self.writer.print(
                 \\extern struct {{
                 \\    transform_t0: SRTData{0s},
@@ -903,8 +1111,8 @@ const Renderer = struct {
             ,
                 .{maybe_author orelse ""},
             );
-            return true;
         } else if (std.mem.eql(u8, basename, "VkAccelerationStructureMatrixMotionInstance")) {
+            try self.renderAssign(name);
             try self.writer.print(
                 \\extern struct {{
                 \\    transform_t0: TransformMatrix{0s},
@@ -923,8 +1131,8 @@ const Renderer = struct {
             ,
                 .{maybe_author orelse ""},
             );
-            return true;
         } else if (std.mem.eql(u8, basename, "VkClusterAccelerationStructureBuildTriangleClusterInfo")) {
+            try self.renderAssign(name);
             try self.writer.print(
                 \\extern struct {{
                 \\    cluster_id: u32,
@@ -950,8 +1158,8 @@ const Renderer = struct {
             ,
                 .{maybe_author orelse ""},
             );
-            return true;
         } else if (std.mem.eql(u8, basename, "VkClusterAccelerationStructureBuildTriangleClusterTemplateInfo")) {
+            try self.renderAssign(name);
             try self.writer.print(
                 \\extern struct {{
                 \\    cluster_id: u32,
@@ -978,8 +1186,8 @@ const Renderer = struct {
             ,
                 .{maybe_author orelse ""},
             );
-            return true;
         } else if (std.mem.eql(u8, basename, "VkClusterAccelerationStructureInstantiateClusterInfo")) {
+            try self.renderAssign(name);
             try self.writer.print(
                 \\extern struct {{
                 \\    cluster_id_offset: u32,
@@ -993,10 +1201,11 @@ const Renderer = struct {
             ,
                 .{maybe_author orelse ""},
             );
-            return true;
+        } else {
+            return false;
         }
 
-        return false;
+        return true;
     }
 
     fn renderSimpleBitContainer(self: *Self, container: reg.Container) !bool {
@@ -1052,10 +1261,6 @@ const Renderer = struct {
             return;
         }
 
-        if (try self.renderSpecialContainer(name)) {
-            return;
-        }
-
         for (container.fields) |field| {
             if (field.bits != null) {
                 return error.UnhandledBitfieldStruct;
@@ -1110,7 +1315,7 @@ const Renderer = struct {
             try self.writer.writeAll(" = .");
             try self.writeIdentifierWithCase(.snake, stype["VK_STRUCTURE_TYPE_".len..]);
         } else if (field.field_type == .name and mem.eql(u8, "VkBool32", field.field_type.name) and isFeatureStruct(name, container.extends)) {
-            try self.writer.writeAll(" = FALSE");
+            try self.writer.writeAll(" = .false");
         } else if (field.is_optional) {
             if (field.field_type == .name) {
                 const field_type_name = field.field_type.name;
@@ -1121,6 +1326,8 @@ const Renderer = struct {
                         try self.writer.writeAll(" = .{}");
                     } else if (decl_type == .typedef and decl_type.typedef == .command_ptr) {
                         try self.writer.writeAll(" = null");
+                    } else if (mem.eql(u8, "VkBool32", field.field_type.name)) {
+                        try self.writer.writeAll(" = .false");
                     } else if ((decl_type == .typedef and builtin_types.has(decl_type.typedef.name)) or
                         (decl_type == .foreign and builtin_types.has(field_type_name)))
                     {
@@ -1810,12 +2017,13 @@ const Renderer = struct {
     }
 
     fn extractReturns(self: *Self, command: reg.Command) ![]const ReturnValue {
-        var returns = std.ArrayList(ReturnValue).init(self.allocator);
+        const allocator = self.allocator;
+        var returns: std.ArrayList(ReturnValue) = .empty;
 
         if (command.return_type.* == .name) {
             const return_name = command.return_type.name;
             if (!mem.eql(u8, return_name, "void") and !mem.eql(u8, return_name, "VkResult")) {
-                try returns.append(.{
+                try returns.append(allocator, .{
                     .name = "return_value",
                     .return_value_type = command.return_type.*,
                     .origin = .inner_return_value,
@@ -1828,7 +2036,7 @@ const Renderer = struct {
                 return error.InvalidRegistry;
             }
 
-            try returns.append(.{
+            try returns.append(allocator, .{
                 .name = "result",
                 .return_value_type = command.return_type.*,
                 .origin = .inner_return_value,
@@ -1839,7 +2047,7 @@ const Renderer = struct {
 
         for (command.params) |param| {
             if ((try self.classifyParam(param)) == .out_pointer) {
-                try returns.append(.{
+                try returns.append(allocator, .{
                     .name = derefName(param.name),
                     .return_value_type = param.param_type.pointer.child.*,
                     .origin = .parameter,
@@ -1847,7 +2055,7 @@ const Renderer = struct {
             }
         }
 
-        return try returns.toOwnedSlice();
+        return try returns.toOwnedSlice(allocator);
     }
 
     fn renderReturnStructName(self: *Self, command_name: []const u8) !void {
@@ -2121,7 +2329,9 @@ pub fn render(
     id_renderer: *IdRenderer,
     have_video: bool,
 ) !void {
-    var renderer = try Renderer.init(writer, allocator, registry, id_renderer, have_video);
+    // var renderer = try Renderer.init(writer, allocator, registry, id_renderer, have_video);
+    var renderer = try Renderer2.init(writer, allocator, registry, id_renderer, have_video);
     defer renderer.deinit();
     try renderer.render();
+    try writer.flush();
 }

src/xml.zig

@@ -439,15 +439,15 @@ fn parseElement(parser: *Parser, alloc: Allocator, comptime kind: ElementKind) !
         },
     };
 
-    var attributes = std.ArrayList(Attribute).init(alloc);
-    defer attributes.deinit();
+    var attributes: std.ArrayList(Attribute) = .empty;
+    defer attributes.deinit(alloc);
 
-    var children = std.ArrayList(Content).init(alloc);
-    defer children.deinit();
+    var children: std.ArrayList(Content) = .empty;
+    defer children.deinit(alloc);
 
     while (parser.eatWs()) {
         const attr = (try parseAttr(parser, alloc)) orelse break;
-        try attributes.append(attr);
+        try attributes.append(alloc, attr);
     }
 
     switch (kind) {
@@ -464,7 +464,7 @@ fn parseElement(parser: *Parser, alloc: Allocator, comptime kind: ElementKind) !
                     }
 
                     const content = try parseContent(parser, alloc);
-                    try children.append(content);
+                    try children.append(alloc, content);
                 }
 
                 const closing_tag = try parseNameNoDupe(parser);
@@ -481,8 +481,8 @@ fn parseElement(parser: *Parser, alloc: Allocator, comptime kind: ElementKind) !
     const element = try alloc.create(Element);
     element.* = .{
         .tag = try alloc.dupe(u8, tag),
-        .attributes = try attributes.toOwnedSlice(),
-        .children = try children.toOwnedSlice(),
+        .attributes = try attributes.toOwnedSlice(alloc),
+        .children = try children.toOwnedSlice(alloc),
     };
     return element;
 }