Examples: SDL3: Added clues that Emscripten doesn't support SDL3 yet. (#6386)

examples/example_sdl3_opengl3/Makefile.emscripten

@@ -1,3 +1,7 @@
+
+# IMPORTANT: SDL3 IS IN DEVELOPMENT, AS OF 2023-05-30, EMSCRIPTEN DOESN'T SUPPORT SDL3 YET.
+# WE ARE LEAVING THIS MAKEFILE AROUND FOR THE DAY IT WILL SUPPORT IT.
+
 #
 # Makefile to use with SDL+emscripten
 # See https://emscripten.org/docs/getting_started/downloads.html

examples/example_sdl3_opengl3/README.md

@@ -37,21 +37,4 @@ c++ `sdl3-config --cflags` -I .. -I ../.. -I ../../backends
 
 ## Emscripten
 
-**Building**
-
-You need to install Emscripten from https://emscripten.org/docs/getting_started/downloads.html, and have the environment variables set, as described in https://emscripten.org/docs/getting_started/downloads.html#installation-instructions
-
-- Depending on your configuration, in Windows you may need to run `emsdk/emsdk_env.bat` in your console to access the Emscripten command-line tools.
-- You may also refer to our [Continuous Integration setup](https://github.com/ocornut/imgui/tree/master/.github/workflows) for Emscripten setup.
-- Then build using `make -f Makefile.emscripten` while in the current directory.
-
-**Running an Emscripten project**
-
-To run on a local machine:
-- `make -f Makefile.emscripten serve` will use Python3 to spawn a local webserver, you can then browse http://localhost:8000 to access your build.
-- Otherwise, generally you will need a local webserver. Quoting [https://emscripten.org/docs/getting_started](https://emscripten.org/docs/getting_started/Tutorial.html#generating-html):<br>
-_"Unfortunately several browsers (including Chrome, Safari, and Internet Explorer) do not support file:// [XHR](https://emscripten.org/docs/site/glossary.html#term-xhr) requests, and can’t load extra files needed by the HTML (like a .wasm file, or packaged file data as mentioned lower down). For these browsers you’ll need to serve the files using a [local webserver](https://emscripten.org/docs/getting_started/FAQ.html#faq-local-webserver) and then open http://localhost:8000/hello.html."_
-- Emscripten SDK has a handy `emrun` command: `emrun web/index.html --browser firefox` which will spawn a temporary local webserver (in Firefox). See https://emscripten.org/docs/compiling/Running-html-files-with-emrun.html for details.
-- You may use Python 3 builtin webserver: `python -m http.server -d web` (this is what `make serve` uses).
-- You may use Python 2 builtin webserver: `cd web && python -m SimpleHTTPServer`.
-- If you are accessing the files over a network, certain browsers, such as Firefox, will restrict Gamepad API access to secure contexts only (e.g. https only).
+As of 2023-05-30 Emscripten doesn't support SDL3 yet.

examples/example_sdl3_opengl3/main.cpp

@@ -14,7 +14,7 @@
 #include <SDL3/SDL_opengl.h>
 #endif
 
-// This example can also compile and run with Emscripten! See 'Makefile.emscripten' for details.
+// This example doesn't compile with Emscripten yet! Awaiting SDL3 support.
 #ifdef __EMSCRIPTEN__
 #include "../libs/emscripten/emscripten_mainloop_stub.h"
 #endif