Always fixup custom __proxy attributes in library_html5_webgl.js (#20135)

Fixes: #20134

Author: sbc100

src/jsifier.js

@@ -225,12 +225,12 @@ function(${args}) {
       i53ConversionDeps.forEach((d) => deps.push(d))
     }
 
-    if (SHARED_MEMORY) {
-      const proxyingMode = LibraryManager.library[symbol + '__proxy'];
-      if (proxyingMode) {
-        if (proxyingMode !== 'sync' && proxyingMode !== 'async') {
-          throw new Error(`Invalid proxyingMode ${symbol}__proxy: '${proxyingMode}' specified!`);
-        }
+    const proxyingMode = LibraryManager.library[symbol + '__proxy'];
+    if (proxyingMode) {
+      if (proxyingMode !== 'sync' && proxyingMode !== 'async') {
+        throw new Error(`Invalid proxyingMode ${symbol}__proxy: '${proxyingMode}' specified!`);
+      }
+      if (SHARED_MEMORY) {
         const sync = proxyingMode === 'sync';
         if (PTHREADS) {
           snippet = modifyJSFunction(snippet, (args, body, async_, oneliner) => {

src/library_html5_webgl.js

@@ -514,13 +514,13 @@ var LibraryHtml5WebGL = {
   emscripten_webgl_get_parameter_i64v: (param, dst) => writeI53ToI64(dst, GLctx.getParameter(param)),
 };
 
-#if PTHREADS
+function handleWebGLProxying(funcs) {
+#if SHARED_MEMORY
 // Process 'sync_on_webgl_context_handle_thread' and 'sync_on_current_webgl_context_thread' pseudo-proxying modes
 // to appropriate proxying mechanism, either proxying on-demand, unconditionally, or never, depending on build modes.
 // 'sync_on_webgl_context_handle_thread' is used for function signatures that take a HTML5 WebGL context handle
 // object as the first argument. 'sync_on_current_webgl_context_thread' is used for functions that operate on the
 // implicit "current WebGL context" as activated via emscripten_webgl_make_current() function.
-function handleWebGLProxying(funcs) {
 
   function listOfNFunctionArgs(func) {
     var args = [];
@@ -586,10 +586,16 @@ function handleWebGLProxying(funcs) {
       delete funcs[i + '__proxy'];
     }
   }
+#else
+  // In single threaded mode just delete our custom __proxy addributes, otherwise
+  // they will causes errors in the JS compiler.
+  for (var i in funcs) {
+    delete funcs[i + '__proxy'];
+  }
+#endif // SHARED_MEMORY
 }
 
 handleWebGLProxying(LibraryHtml5WebGL);
-#endif // PTHREADS
 
 #if LibraryManager.has('library_webgl.js')
 autoAddDeps(LibraryHtml5WebGL, '$GL');