Merge pull request #319 from De-Panther/optimize_ar_mode

Fix performance issues in AR

Author: De-Panther

Packages/webxr/CHANGELOG.md

@@ -14,6 +14,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - OnControllerUpdate is not dependent on OnHandUpdate in WebXRSubsystem.
 - WebXRControllerData gripPosition and gripRotation return world space value instead of relative to pointer pose.
 
+### Fixed
+- Performance issues in AR mode.
+
 ## [0.18.0] - 2023-08-29
 ### Added
 - Option to update active camera tag in WebXRCamera.

Packages/webxr/Runtime/Plugins/WebGL/transparent_bg.jslib

@@ -1,14 +1,22 @@
 // Modified version of https://forum.unity.com/threads/webgl-transparent-background.284699/#post-1880667
 // More details at https://support.unity.com/hc/en-us/articles/208892946-How-can-I-make-the-canvas-transparent-on-WebGL-
 var LibraryGLClear = {
+  $colorMaskValue: [true, true, true, true],
   glClear: function (mask) {
     if (mask == 0x00004000 && GLctx.dontClearAlphaOnly) {
-      var v = GLctx.getParameter(GLctx.COLOR_WRITEMASK);
-      if (!v[0] && !v[1] && !v[2] && v[3])
+      if (!colorMaskValue[0] && !colorMaskValue[1] && !colorMaskValue[2] && colorMaskValue[3])
         // We are trying to clear alpha only -- skip.
         return;
     }
     GLctx.clear(mask);
+  },
+  glColorMask: function (red, green, blue, alpha) {
+    colorMaskValue[0] = !!red;
+    colorMaskValue[1] = !!green;
+    colorMaskValue[2] = !!blue;
+    colorMaskValue[3] = !!alpha;
+    GLctx.colorMask(colorMaskValue[0], colorMaskValue[1], colorMaskValue[2], colorMaskValue[3]);
   }
 };
+autoAddDeps(LibraryGLClear, '$colorMaskValue');
 mergeInto(LibraryManager.library, LibraryGLClear);