all: use explicit backing integers for packed structs

libs/basisu/src/encoder.zig

@@ -203,7 +203,7 @@ pub const Image = struct {
     }
 };
 
-pub const PackUASTCFlags = packed struct {
+pub const PackUASTCFlags = packed struct(u32) {
     fastest: bool = false,
     faster: bool = false,
     default: bool = false,

libs/basisu/src/transcoder.zig

@@ -117,7 +117,7 @@ pub const Transcoder = struct {
         block_count: u32,
     };
 
-    pub const DecodeFlags = packed struct {
+    pub const DecodeFlags = packed struct(u32) {
         _padding: u1 = 0,
         pvrtc_decode_to_next_pow_2: bool = false,
         transcode_alpha_data_to_opaque_formats: bool = false,

libs/core/src/Core.zig

@@ -362,14 +362,14 @@ pub const Key = enum {
     unknown,
 };
 
-pub const KeyMods = packed struct {
+pub const KeyMods = packed struct(u8) {
     shift: bool,
     control: bool,
     alt: bool,
     super: bool,
     caps_lock: bool,
     num_lock: bool,
-    _reserved: u2 = 0,
+    _padding: u2 = 0,
 };
 
 pub const DisplayMode = enum {

libs/glfw/src/hat.zig

@@ -4,12 +4,12 @@ const c = @import("c.zig").c;
 /// A bitmask of all Joystick hat states
 ///
 /// See glfw.Joystick.getHats for how these are used.
-pub const Hat = packed struct {
+pub const Hat = packed struct(u8) {
     up: bool = false,
     right: bool = false,
     down: bool = false,
     left: bool = false,
-    _reserved: u4 = 0,
+    _padding: u4 = 0,
 
     pub inline fn centered(self: Hat) bool {
         return self.up == false and self.right == false and self.down == false and self.left == false;
@@ -57,7 +57,7 @@ test "from int, single" {
         .right = false,
         .down = false,
         .left = false,
-        ._reserved = 0,
+        ._padding = 0,
     }, Hat.fromInt(RawHat.up));
 }
 
@@ -69,7 +69,7 @@ test "from int, multi" {
         .right = false,
         .down = true,
         .left = true,
-        ._reserved = 0,
+        ._padding = 0,
     }, Hat.fromInt(RawHat.up | RawHat.down | RawHat.left));
 }
 
@@ -81,7 +81,7 @@ test "to int, single" {
         .right = false,
         .down = false,
         .left = false,
-        ._reserved = 0,
+        ._padding = 0,
     };
     try std.testing.expectEqual(v.toInt(c_int), RawHat.up);
 }
@@ -94,7 +94,7 @@ test "to int, multi" {
         .right = false,
         .down = true,
         .left = true,
-        ._reserved = 0,
+        ._padding = 0,
     };
     try std.testing.expectEqual(v.toInt(c_int), RawHat.up | RawHat.down | RawHat.left);
 }

libs/glfw/src/mod.zig

@@ -6,14 +6,14 @@ const c = @import("c.zig").c;
 
 // must be in sync with GLFW C constants in modifier group, search for "@defgroup mods Modifier key flags"
 /// A bitmask of all key modifiers
-pub const Mods = packed struct {
+pub const Mods = packed struct(u8) {
     shift: bool = false,
     control: bool = false,
     alt: bool = false,
     super: bool = false,
     caps_lock: bool = false,
     num_lock: bool = false,
-    _reserved: u2 = 0,
+    _padding: u2 = 0,
 
     inline fn verifyIntType(comptime IntType: type) void {
         comptime {

libs/gpu/src/buffer.zig

@@ -29,7 +29,7 @@ pub const Buffer = opaque {
         unmapped_before_callback = 0x00000005,
     };
 
-    pub const UsageFlags = packed struct {
+    pub const UsageFlags = packed struct(u32) {
         map_read: bool = false,
         map_write: bool = false,
         copy_src: bool = false,

libs/gpu/src/texture.zig

@@ -136,7 +136,7 @@ pub const Texture = opaque {
         uint = 0x00000005,
     };
 
-    pub const UsageFlags = packed struct {
+    pub const UsageFlags = packed struct(u32) {
         copy_src: bool = false,
         copy_dst: bool = false,
         texture_binding: bool = false,

libs/gpu/src/types.zig

@@ -410,7 +410,7 @@ pub const VertexStepMode = enum(u32) {
     vertex_buffer_not_used = 0x00000002,
 };
 
-pub const ColorWriteMaskFlags = packed struct {
+pub const ColorWriteMaskFlags = packed struct(u32) {
     red: bool = false,
     green: bool = false,
     blue: bool = false,
@@ -437,7 +437,7 @@ pub const ColorWriteMaskFlags = packed struct {
     }
 };
 
-pub const MapModeFlags = packed struct {
+pub const MapModeFlags = packed struct(u32) {
     read: bool = false,
     write: bool = false,
 
@@ -457,7 +457,7 @@ pub const MapModeFlags = packed struct {
     }
 };
 
-pub const ShaderStageFlags = packed struct {
+pub const ShaderStageFlags = packed struct(u32) {
     vertex: bool = false,
     fragment: bool = false,
     compute: bool = false,

libs/model3d/src/main.zig

@@ -154,7 +154,7 @@ pub const Quality = enum(u2) {
     double = c.M3D_EXP_DOUBLE,
 };
 
-pub const Flags = packed struct {
+pub const Flags = packed struct(u32) {
     // don't export color map
     nocmap: bool = false,
     // don't export materials