Examples: GLFW+OpenGL3, GLFW+WGPU: Emscripten Makefiles uses port contrib.glfw3 (#8742)

This unofficial port offers a better support for HighDPI.
See
- https://emscripten.org/docs/compiling/Contrib-Ports.html
- https://github.com/pongasoft/emscripten-glfw

Author: pthom

docs/CHANGELOG.txt

@@ -61,6 +61,8 @@ Other changes:
 - Demo: Added "Text -> Font Size" demo section. (#8738) [@Demonese]
 - CI: Fixed dllimport/dllexport tests. (#8757) [@AidanSun05]
 - CI: Updated to use latest Windows image + VS2022.
+- Examples: GLFW+OpenGL3, GLFW+WGPU: Emscripten Makefiles uses GLFW port 
+  'contrib.glfw3' which offers better HiDPI support. (#8742) [@pthom]
 - Backends: GLFW, SDL2 made ImGui_ImplGLFW_GetContentScaleXXX() and 
   ImGui_ImplSDL2_GetContentScaleXXXX() helpers return 1.0f on Emscripten 
   and Android platforms, matching macOS logic. (#8742, #8733) [@pthom]

examples/example_glfw_opengl3/Makefile.emscripten

@@ -32,8 +32,9 @@ EMS =
 ##---------------------------------------------------------------------
 
 # ("EMS" options gets added to both CPPFLAGS and LDFLAGS, whereas some options are for linker only)
-EMS += -s DISABLE_EXCEPTION_CATCHING=1
-LDFLAGS += -s USE_GLFW=3 -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=0 -s ASSERTIONS=1
+# Note: For glfw, we use emscripten-glfw port (contrib.glfw3) instead of ('-s USE_GLFW=3' in LDFLAGS) to get a better support for High DPI displays.
+EMS += -s DISABLE_EXCEPTION_CATCHING=1 --use-port=contrib.glfw3
+LDFLAGS += -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=0 -s ASSERTIONS=1
 
 # Build as single file (binary text encoded in .html file)
 #LDFLAGS += -sSINGLE_FILE

examples/example_glfw_wgpu/Makefile.emscripten

@@ -32,8 +32,9 @@ EMS =
 ##---------------------------------------------------------------------
 
 # ("EMS" options gets added to both CPPFLAGS and LDFLAGS, whereas some options are for linker only)
-EMS += -s DISABLE_EXCEPTION_CATCHING=1
-LDFLAGS += -s USE_GLFW=3 -s USE_WEBGPU=1
+# Note: For glfw, we use emscripten-glfw port (contrib.glfw3) instead of (-s USE_GLFW=3) to get a better support for High DPI displays.
+EMS += -s DISABLE_EXCEPTION_CATCHING=1 --use-port=contrib.glfw3
+LDFLAGS += -s USE_WEBGPU=1
 LDFLAGS += -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=0 -s ASSERTIONS=1
 
 # Build as single file (binary text encoded in .html file)