emscripten: Set examples as htmls

Fix `undefined symbol emscripten_webgl2_get_proc_address` linker error

CMakeLists.txt

@@ -21,6 +21,10 @@ if( APPLE AND NOT XCODE )
 	set( CMAKE_CXX_FLAGS "-ObjC++" )
 endif()
 
+if (MSVC AND (MSVC_VERSION GREATER_EQUAL 1914))
+    add_compile_options("/Zc:__cplusplus")
+endif()
+
 option( BGFX_BUILD_TOOLS                "Build bgfx tools."                             ON  )
 option( BGFX_BUILD_EXAMPLES             "Build bgfx examples."                          ON  )
 option( BGFX_INSTALL                    "Create installation target."                   ON  )
@@ -30,6 +34,7 @@ option( BGFX_AMALGAMATED                "Amalgamated bgfx build for faster compi
 option( BX_AMALGAMATED                  "Amalgamated bx build for faster compilation"   OFF )
 option( BGFX_CONFIG_MULTITHREADED       "Build bgfx with multithreaded configuration"   ON )
 option( BGFX_CONFIG_RENDERER_WEBGPU     "Enables the webgpu renderer"                   OFF )
+option( BX_CONFIG_DEBUG                 "Log debug messages (default: on in debug)"     OFF )
 
 set( BGFX_OPENGL_VERSION   ""       CACHE STRING "Specify minimum opengl version" )
 set( BGFX_OPENGLES_VERSION ""       CACHE STRING "Specify minimum OpenGL ES version" )

cmake/bgfx.cmake

@@ -56,6 +56,10 @@ if(BGFX_CONFIG_RENDERER_WEBGPU)
     endif()
 endif()
 
+if(EMSCRIPTEN)
+	target_link_options(bgfx PUBLIC "-sMAX_WEBGL_VERSION=2")
+endif()
+
 if( NOT ${BGFX_OPENGL_VERSION} STREQUAL "" )
 	target_compile_definitions( bgfx PRIVATE BGFX_CONFIG_RENDERER_OPENGL_MIN_VERSION=${BGFX_OPENGL_VERSION} )
 endif()
@@ -72,7 +76,7 @@ endif()
 # Add debug config required in bx headers since bx is private
 target_compile_definitions(bgfx
        PUBLIC
-               "BX_CONFIG_DEBUG=$<CONFIG:Debug>"
+               "BX_CONFIG_DEBUG=$<IF:$<CONFIG:Debug>,1,$<BOOL:${BX_CONFIG_DEBUG}>>"
                "BGFX_CONFIG_MULTITHREADED=$<BOOL:${BGFX_CONFIG_MULTITHREADED}>"
 )
 

cmake/bx.cmake

@@ -30,6 +30,10 @@ endif()
 # Create the bx target
 add_library( bx STATIC ${BX_SOURCES} )
 
+target_compile_features( bx PUBLIC cxx_std_14 )
+# (note: see bx\scripts\toolchain.lua for equivalent compiler flag)
+target_compile_options( bx PUBLIC $<$<CXX_COMPILER_ID:MSVC>:/Zc:__cplusplus> )
+
 # Link against psapi on Windows
 if( WIN32 )
 	target_link_libraries( bx PUBLIC psapi )
@@ -67,7 +71,7 @@ target_compile_definitions( bx PUBLIC "__STDC_LIMIT_MACROS" )
 target_compile_definitions( bx PUBLIC "__STDC_FORMAT_MACROS" )
 target_compile_definitions( bx PUBLIC "__STDC_CONSTANT_MACROS" )
 
-target_compile_definitions(bx PUBLIC "BX_CONFIG_DEBUG=$<CONFIG:Debug>")
+target_compile_definitions(bx PUBLIC "BX_CONFIG_DEBUG=$<IF:$<CONFIG:Debug>,1,$<BOOL:${BX_CONFIG_DEBUG}>>")
 
 # Additional dependencies on Unix
 if (ANDROID)

cmake/examples.cmake

@@ -179,10 +179,12 @@ function( add_example ARG_NAME )
 	endif()
 
 	if (NOT ARG_COMMON AND EMSCRIPTEN)
-		target_link_libraries(example-${ARG_NAME}
-			"-s PRECISE_F32=1"
-			"-s TOTAL_MEMORY=268435456"
-			"--memory-init-file 1")
+		set_target_properties(example-${ARG_NAME}
+			PROPERTIES
+				LINK_FLAGS
+					"-s PRECISE_F32=1 -s TOTAL_MEMORY=268435456 -s ENVIRONMENT=web --memory-init-file 1 --emrun"
+				SUFFIX ".html"
+		)
 	endif()
 
 	# Directory name