Worked on windows and emscripten builds, still not perfect.

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "thirdparty/zlib"]
+	path = thirdparty/zlib
+	url = https://github.com/madler/zlib
+[submodule "thirdparty/SDL2"]
+	path = thirdparty/SDL2
+	url = https://github.com/emscripten-ports/SDL2.git

CMakeLists.txt

@@ -85,7 +85,7 @@ if(PSP)
     WAGIC_OPTION(backend_psp         "build for psp"          ON)
 endif()
 if(WIN32 OR ANDROID OR UNIX)
-    WAGIC_OPTION(backend_sdl         "build for sdl"          (WIN32 OR ANDROID))
+    WAGIC_OPTION(backend_sdl         "build for sdl"          (WIN32 OR ANDROID OR EMSCRIPTEN))
 endif()
 if(NOT backend_sdl AND UNIX AND NOT ANDROID)
     WAGIC_OPTION(backend_qt_console  "build qt-console version with testsuit" ON)
@@ -93,12 +93,13 @@ if(NOT backend_sdl AND UNIX AND NOT ANDROID)
 endif()
 
 #third party build options
-WAGIC_OPTION(BUILD_ZLIB    "build zlib from source"    WIN32)
+WAGIC_OPTION(BUILD_ZLIB    "build zlib from source"    WIN32 OR EMSCRIPTEN)
-WAGIC_OPTION(BUILD_JPEG    "build jpeg from source"    (WIN32 OR APPLE OR PSP OR ANDROID))
+WAGIC_OPTION(BUILD_JPEG    "build jpeg from source"    (WIN32 OR APPLE OR PSP OR ANDROID OR EMSCRIPTEN))
-WAGIC_OPTION(BUILD_PNG     "build png from source"     (WIN32 OR APPLE OR PSP OR ANDROID))
+WAGIC_OPTION(BUILD_PNG     "build png from source"     (WIN32 OR APPLE OR PSP OR ANDROID OR EMSCRIPTEN))
 WAGIC_OPTION(BUILD_UNZIP   "build unzip from source"   ON)
-WAGIC_OPTION(BUILD_TINYXML "build tinyxml from source" (WIN32 OR APPLE OR PSP OR ANDROID))
+WAGIC_OPTION(BUILD_TINYXML "build tinyxml from source" (WIN32 OR APPLE OR PSP OR ANDROID OR EMSCRIPTEN))
 WAGIC_OPTION(BUILD_ZIPFS   "build zipfs from source"   ON)
+WAGIC_OPTION(BUILD_SDL2    "build SDL2 from source"    (backend_sdl AND (WIN32 OR ANDROID OR EMSCRIPTEN)))
 
 #project options
 if(ANDROID)
@@ -145,6 +146,8 @@ elseif(UNIX)
     include(platforms/unix/configure.cmake)
 elseif(ANDROID)
     include(platforms/android/configure.cmake)
+elseif(EMSCRIPTEN)
+    include(platforms/emscripten/configure.cmake)
 endif()
 
 #set backend dependend configurations
@@ -159,7 +162,6 @@ elseif(backend_sdl)
 endif()
 
 # find or build 3rd party libraries
-
 FindOrBuildZLIB()
 FindOrBuildOpenGL()
 FindOrBuildTinyXML()
@@ -200,3 +202,7 @@ add_subdirectory(projects/mtg)
 if(BUILD_ANDROID_PACKAGE)
   add_subdirectory(platforms/android/package)
 endif()
+
+if(EMSCRIPTEN)
+  set(CMAKE_EXECUTABLE_SUFFIX ".html")
+endif()

CMakeModules/FindOrBuild.cmake

@@ -24,15 +24,23 @@ macro(FindOrBuildTinyXML)
 endmacro()
 
 macro(FindOrBuildSDL2)
-    if(ANDROID)
+    if(BUILD_SDL2)
-        set(ENV{SDL2DIR} "$ENV{ANDROID_SDL2_ROOT};$ENV{ANDROID_SDL2_ROOT}/libs/${ANDROID_NDK_ABI_NAME}/")
+        if(WIN32)
-    elseif(WIN32 OR UNIX)
+            #SDL2 DirectX build is somehow broken...
-#        set(ENV{SDL2DIR} $ENV{WIN_SDL2_ROOT})
+            set(SDL_AUDIO FALSE)
+            set(SDL_JOYSTICK FALSE)
+            set(SDL_HAPTIC FALSE)
+            set(SDL_SHARED FALSE)
+        endif()
         add_subdirectory(${CMAKE_SOURCE_DIR}/thirdparty/SDL2)
         set(SDL2_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/thirdparty/SDL2/include ${CMAKE_BINARY_DIR}/thirdparty/SDL2)
-        set(SDL2_LIBRARY SDL2)
+        if(EMSCRIPTEN OR WIN32)
-	else()
+            set(SDL2_LIBRARY SDL2-static)
-		find_package(SDL2)
+        else()
+            set(SDL2_LIBRARY SDL2)
+        endif()
+    elseif(NOT EMSCRIPTEN)
+        find_package(SDL2)
     endif()
 endmacro()
 
@@ -90,7 +98,7 @@ endmacro()
 
 macro(FindOrBuildZLIB)
     if(BUILD_ZLIB)
-		add_subdirectory(${CMAKE_SOURCE_DIR}/thirdparty/zlib)
+        add_subdirectory(${CMAKE_SOURCE_DIR}/thirdparty/zlib)
         set(ZLIB_INCLUDE_DIRS ${CMAKE_SOURCE_DIR}/thirdparty/zlib ${CMAKE_BINARY_DIR}/thirdparty/zlib)
         set(ZLIB_LIBRARIES zlib)
 	else()
@@ -142,7 +150,8 @@ endmacro()
 macro(FindOrBuildPNG)
     if(BUILD_PNG)
         add_subdirectory(${CMAKE_SOURCE_DIR}/thirdparty/libpng ${CMAKE_BINARY_DIR}/thirdparty/libpng)
-        find_path(PNG_INCLUDE_DIRS NAMES png.h HINTS ${CMAKE_SOURCE_DIR}/thirdparty/libpng)
+        set(PNG_INCLUDE_DIRS ${CMAKE_SOURCE_DIR}/thirdparty/libpng)
+#        find_path(PNG_INCLUDE_DIRS NAMES png.h HINTS ${CMAKE_SOURCE_DIR}/thirdparty/libpng)
         set(PNG_LIBRARIES png)
     else()
         if(WIN32)
@@ -202,6 +211,8 @@ macro(FindOrBuildOpenGL)
         if(ANDROID)
             #find openglesv on android
             set(OPENGL_LIBRARIES "-ldl -lGLESv1_CM -lGLESv2 -llog -landroid")
+        elseif(EMSCRIPTEN)
+            set(OPENGL_LIBRARIES "")
         else()
             find_package(OpenGL)
 #            find_package(GLUT)

JGE/CMakeLists.txt

@@ -101,7 +101,7 @@ if(backend_qt_widget)
 endif()
 
 if(backend_sdl)
-    if(UNIX AND NOT ANDROID)
+    if((UNIX OR EMSCRIPTEN) AND NOT ANDROID)
         set(JGE_INTERNAL_INCLUDE_DIRS ${TINYXML_INCLUDE_DIR} ${ZIPFS_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR}  ${GLUT_INCLUDE_DIR}
             ${SDL2_INCLUDE_DIR} ${UNZIP_INCLUDE_DIR} ${PNG_INCLUDE_DIRS} ${JPEG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIRS})
         set(JGE_SOURCES ${JGE_generic_src} ${JGE_graphics_src} ${JGE_linux_src} ${JGE_hge_src})
@@ -119,7 +119,7 @@ if(backend_sdl)
             ${UNZIP_INCLUDE_DIR} ${PNG_INCLUDE_DIRS} ${JPEG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIRS} ${CMAKE_SOURCE_DIR}/thirdparty/binary/win/include)
         set(JGE_SOURCES ${JGE_generic_src} ${JGE_graphics_src} ${JGE_linux_src} ${JGE_hge_src})
         set(JGE_LINK_LIBRARIES ${ZIPFS_LIBRARY} ${UNZIP_LIRARY} ${JPEG_LIBRARY} ${PNG_LIBRARIES})
-        set(JGE_LINK_DIRECTORIES ${Boost_LIBRARY_DIR} ${SDL2_LIBRARY_DIR})
+        set(JGE_LINK_DIRECTORIES ${Boost_LIBRARY_DIR})
     endif()
 endif()
 

JGE/src/pc/JGfx.cpp

@@ -12,7 +12,7 @@
 #if (!defined IOS) && (!defined QT_CONFIG)
 #ifdef WIN32
 #pragma warning(disable : 4786)
-#pragma comment( lib, "giflib.lib" )
+//#pragma comment( lib, "giflib.lib" )
 #endif
 
 #include <png.h>

platforms/emscripten/configure.cmake

@@ -0,0 +1,3 @@
+set_target_properties(wagic PROPERTIES LINK_FLAGS "-s USE_SDL=2")
+set(CMAKE_CXX_FLAGS "-s USE_SDL=2")
+set(CMAKE_EXECUTABLE_SUFFIX ".html")

projects/mtg/CMakeLists.txt

@@ -166,8 +166,8 @@ elseif(backend_qt_widget)
         message(FATAL_ERROR "qt-widget bilds are only supported on unix platforms")
     endif()
 elseif(backend_sdl)
-    if(UNIX AND NOT ANDROID)
+    if((UNIX OR EMSCRIPTEN) AND NOT ANDROID)
-        include_directories(${MTG_INCLUDE_DIRS} ${JGE_INCLUDE_DIRS} ${SDL2_INCLUDE_DIR} ${ZIPFS_INCLUDE_DIR} ${UNZIP_INCLUDE_DIR} ${HGE_INCLUDE_DIR} ${TINYXML_INCLUDE_DIR})
+        include_directories(${MTG_INCLUDE_DIRS} ${JGE_INCLUDE_DIRS} ${SDL2_INCLUDE_DIR} ${ZIPFS_INCLUDE_DIR} ${UNZIP_INCLUDE_DIR} ${HGE_INCLUDE_DIR} ${TINYXML_INCLUDE_DIR} ${ZLIB_INCLUDE_DIRS})
         add_executable(wagic ${MTG_generic_src} ${MTG_sdl_src})
         target_link_libraries(wagic  ${JGE_LIBRARY} ${SDL2_LIBRARY} ${OPENGL_LIBRARIES} ${TINYXML_LIBRARIES} ${HGE_LIBRARY} ${ZLIB_LIBRARIES})
     elseif(ANDROID)
@@ -188,7 +188,7 @@ elseif(backend_sdl)
         add_executable(wagic ${MTG_generic_src} ${MTG_sdl_src} src/TestSuiteAI.cpp src/AIPlayerBakaB.cpp)
         link_directories(${Boost_LIBRARY_DIR} ${SDL2_LIBRARY_DIR})
         target_link_libraries(wagic  ${JGE_LIBRARY} ${SDL2_LIBRARY} ${OPENGL_LIBRARIES} ${TINYXML_LIBRARIES} 
-            ${BOOST_date_time} ${HGE_LIBRARY} ${CMAKE_SOURCE_DIR}/thirdparty/binary/win/lib/fmodvc.lib)
+            ${BOOST_date_time} ${HGE_LIBRARY} ${CMAKE_SOURCE_DIR}/thirdparty/binary/win/lib/fmodvc.lib ${ZLIB_LIBRARIES})
     endif()
 elseif(backend_psp)
     if(PSP)