gpu: make TextureView an enum with methods

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

gpu/src/texture_view.zig

@@ -0,0 +1,15 @@
+pub const TextureView = enum(usize) {
+    _,
+
+    pub const none: TextureView = @intToEnum(TextureView, 0);
+
+    pub const Dimension = enum(u32) {
+        dimension_undef = 0x00000000,
+        dimension_1d = 0x00000001,
+        dimension_2d = 0x00000002,
+        dimension_2d_array = 0x00000003,
+        dimension_cube = 0x00000004,
+        dimension_cube_array = 0x00000005,
+        dimension_3d = 0x00000006,
+    };
+};