support WEBGL_lose_context

Author: nikneym

src/browser/canvas/WebGLRenderingContext.zig

@@ -61,7 +61,7 @@ pub const Extension = union(enum) {
     WEBGL_debug_shaders: void,
     WEBGL_depth_texture: void,
     WEBGL_draw_buffers: void,
-    WEBGL_lose_context: void,
+    WEBGL_lose_context: Type.WEBGL_lose_context,
     WEBGL_multi_draw: void,
     WEBGL_polygon_mode: void,
 
@@ -117,6 +117,12 @@ pub const Extension = union(enum) {
                 return UNMASKED_RENDERER_WEBGL;
             }
         };
+
+        pub const WEBGL_lose_context = struct {
+            _: u8 = 0,
+            pub fn _loseContext(_: *const WEBGL_lose_context) void {}
+            pub fn _restoreContext(_: *const WEBGL_lose_context) void {}
+        };
     };
 };
 
@@ -128,6 +134,7 @@ pub fn _getExtension(self: *const WebGLRenderingContext, name: []const u8) ?Exte
 
     return switch (tag) {
         .WEBGL_debug_renderer_info => @unionInit(Extension, "WEBGL_debug_renderer_info", .{}),
+        .WEBGL_lose_context => @unionInit(Extension, "WEBGL_lose_context", .{}),
         inline else => |comptime_enum| @unionInit(Extension, @tagName(comptime_enum), {}),
     };
 }

src/browser/canvas/root.zig

@@ -9,4 +9,5 @@ pub const Interfaces = .{
     CanvasRenderingContext2D,
     WebGLRenderingContext,
     Extension.Type.WEBGL_debug_renderer_info,
+    Extension.Type.WEBGL_lose_context,
 };

src/tests/html/canvas.html

@@ -102,4 +102,15 @@
   testing.expectEqual(rendererInfo.UNMASKED_VENDOR_WEBGL, 0x9245);
   testing.expectEqual(rendererInfo.UNMASKED_RENDERER_WEBGL, 0x9246);
 }
+
+// WEBGL_lose_context
+{
+  const element = document.createElement("canvas");
+  const ctx = element.getContext("webgl");
+  const loseContext = ctx.getExtension("WEBGL_lose_context");
+  testing.expectEqual(true, loseContext instanceof WEBGL_lose_context);
+
+  loseContext.loseContext();
+  loseContext.restoreContext();
+}
 </script>