Fix resizing under EGL

Makefile.emscripten

@@ -29,7 +29,7 @@ HAVE_SCREENSHOTS = 1
 HAVE_REWIND = 1
 HAVE_AUDIOMIXER = 1
 HAVE_CC_RESAMPLER = 1
-HAVE_EGL    ?= 0
+HAVE_EGL    ?= 1
 HAVE_OPENGLES = 1
 HAVE_RJPEG  = 0
 HAVE_RPNG   = 1
@@ -56,6 +56,7 @@ HAVE_AL = 1
 HAVE_CHD ?= 0
 HAVE_WASMFS ?= 1
 HAVE_WORKER ?= 1
+PROXY_TO_PTHREAD ?= 0
 
 DEFINES += -DHAVE_NETWORKING -DHAVE_ONLINE_UPDATER -DHAVE_UPDATE_ASSETS -DHAVE_COMPRESSION
 DEFINES += -DHAVE_UPDATE_CORE_INFO
@@ -77,7 +78,7 @@ FS_DEBUG = 1
 HAVE_OPENGLES ?= 1
 HAVE_OPENGLES3 ?= 0
 
-ASYNC ?= 0
+ASYNC ?= 1
 LTO ?= 0
 PTHREAD ?= 4
 
@@ -114,15 +115,13 @@ endif
 
 ifeq ($(HAVE_WORKER), 1)
    LIBS += -s USE_ES6_IMPORT_META=0 -sENVIRONMENT=worker,web
-else 
-   ifeq ($(HAVE_AL), 1)
-     override ASYNC = 1
-   endif
 endif
 
 ifeq ($(PROXY_TO_PTHREAD),1)
    LIBS += -sPROXY_TO_PTHREAD -sOFFSCREENCANVAS_SUPPORT
    DEFINES += -DUSE_OFFSCREENCANVAS=1 -DPROXY_TO_PTHREAD=1
+else
+   override ASYNC = 1
 endif
 
 ifeq ($(HAVE_SDL2), 1)

frontend/drivers/platform_emscripten.c

@@ -60,14 +60,13 @@ void PlatformEmscriptenWatchCanvasSize(void) {
          var h = Module.canvas.height;
          if (w == 0 || h == 0 || width == 0 || height == 0) { return; }
          /* Module.print("Setting real canvas size: " + width + " x " + height); */
-         if (Module.canvas.controlTransferredOffscreen) {
-            var new_w = `${width}px`;
-            var new_h = `${height}px`;
-            if (Module.canvas.style.width != new_w || Module.canvas.style.height != new_h) {
-               Module.canvas.style.width = new_w;
-               Module.canvas.style.height = new_h;
-            }
-         } else {
+         var new_w = `${width}px`;
+         var new_h = `${height}px`;
+         if (Module.canvas.style.width != new_w || Module.canvas.style.height != new_h) {
+            Module.canvas.style.width = new_w;
+            Module.canvas.style.height = new_h;
+         }
+         if (!Module.canvas.controlTransferredOffscreen) {
             Module.Browser.setCanvasSize(width, height);
          }
       });

gfx/drivers_context/emscriptenegl_ctx.c

@@ -70,11 +70,10 @@ static void gfx_ctx_emscripten_check_window(void *data, bool *quit,
    emscripten_ctx_data_t *emscripten = (emscripten_ctx_data_t*)data;
 
    gfx_ctx_emscripten_get_canvas_size(&input_width, &input_height);
-
+   *resize = (emscripten->fb_width != input_width || emscripten->fb_height != input_height);
    *width  = emscripten->fb_width  = (unsigned)input_width;
    *height = emscripten->fb_height = (unsigned)input_height;
    *quit   = false;
-   *resize = false;
 }
 
 static void gfx_ctx_emscripten_swap_buffers(void *data)
@@ -94,9 +93,10 @@ static void gfx_ctx_emscripten_get_video_size(void *data,
 
    if (!emscripten)
       return;
-
-   *width  = emscripten->fb_width;
-   *height = emscripten->fb_height;
+   int w, h;
+   gfx_ctx_emscripten_get_canvas_size(&w, &h);
+   *width = w;
+   *height = h;
 }
 
 static bool gfx_ctx_emscripten_get_metrics(void *data,