[emscripten] add wasm32 build target

CMakeLists.txt

@@ -30,6 +30,23 @@ endif()
 
 message(STATUS "dethrace version ${DETHRACE_VERSION}")
 
+if (CMAKE_SYSTEM_NAME MATCHES "Emscripten")
+    set(USE_FLAGS "--use-port=sdl2 --use-port=sdl2_image")
+
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${USE_FLAGS}")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${USE_FLAGS}")
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${USE_FLAGS} \
+              -Wl,-u,scalbnl \
+              -sASYNCIFY \
+              -sALLOW_MEMORY_GROWTH -sINITIAL_MEMORY=256mb -sMEMORY_GROWTH_LINEAR_STEP=128mb \
+              -sSTACK_SIZE=1024kb \
+              -sENVIRONMENT=web \
+              -sMODULARIZE \
+              -sEXPORT_ALL -sEXPORTED_RUNTIME_METHODS=callMain,addRunDependency,removeRunDependency \
+              -sEXIT_RUNTIME \
+              -lwebsocket.js -lidbfs.js -sCASE_INSENSITIVE_FS -sASSERTIONS=2 --profiling-funcs")
+endif ()
+
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}")
 
 set(DETHRACE_IDE_ARGUMENTS "" CACHE STRING "DethRace arguments (only used by MSVC when debugging")
@@ -67,19 +84,23 @@ option(DETHRACE_PLATFORM_SDL2 "Support SDL 2 platform driver"   ON)
 set(count_sdl_platforms 0)
 
 set(DETHRACE_PLATFORMS )
-if(DETHRACE_PLATFORM_SDL1)
-    find_package(SDL REQUIRED)
-    list(APPEND DETHRACE_PLATFORMS SDL1)
-    math(EXPR count_sdl_platforms "${count_sdl_platforms} + 1")
-endif()
-if(DETHRACE_PLATFORM_SDL2)
-    find_package(SDL2 CONFIG)
-    if(NOT SDL2_FOUND)
-        find_package(SDL2 MODULE REQUIRED)
+if (NOT CMAKE_SYSTEM_NAME MATCHES "Emscripten")
+    if(DETHRACE_PLATFORM_SDL1)
+        find_package(SDL REQUIRED)
+        list(APPEND DETHRACE_PLATFORMS SDL1)
+        math(EXPR count_sdl_platforms "${count_sdl_platforms} + 1")
     endif()
+    if(DETHRACE_PLATFORM_SDL2)
+        find_package(SDL2 CONFIG)
+        if(NOT SDL2_FOUND)
+            find_package(SDL2 MODULE REQUIRED)
+        endif()
+        list(APPEND DETHRACE_PLATFORMS SDL2)
+        math(EXPR count_sdl_platforms "${count_sdl_platforms} + 1")
+    endif()
+else ()
     list(APPEND DETHRACE_PLATFORMS SDL2)
-    math(EXPR count_sdl_platforms "${count_sdl_platforms} + 1")
-endif()
+endif ()
 
 if(count_sdl_platforms GREATER 1)
     # Force dynamic SDL when enabling 2 (or more) SDL platform backends

src/harness/CMakeLists.txt

@@ -82,7 +82,9 @@ if(DETHRACE_PLATFORM_SDL2)
         set_property(SOURCE "${CMAKE_CURRENT_SOURCE_DIR}/platforms/sdl2.c" APPEND PROPERTY INCLUDE_DIRECTORIES "$<TARGET_PROPERTY:SDL2::SDL2,INTERFACE_INCLUDE_DIRECTORIES>")
         set_property(GLOBAL APPEND PROPERTY DETHRACE_BUILD_RPATHS "$<TARGET_FILE_DIR:SDL2::SDL2>")
     else()
-        target_link_libraries(harness PRIVATE SDL2::SDL2)
+        if (NOT CMAKE_SYSTEM_NAME MATCHES "Emscripten")
+            target_link_libraries(harness PRIVATE SDL2::SDL2)
+        endif ()
     endif()
 endif()
 

src/harness/os/linux.c

@@ -9,7 +9,9 @@
 #include <dirent.h>
 #include <err.h>
 #include <errno.h>
+#ifndef __EMSCRIPTEN__
 #include <execinfo.h>
+#endif
 #include <fcntl.h>
 #include <ifaddrs.h>
 #include <libgen.h>
@@ -73,6 +75,7 @@ int addr2line(char const* const program_name, void const* const addr) {
 }
 
 static void print_stack_trace(void) {
+#ifndef __EMSCRIPTEN__
     int i, trace_size = 0;
     char** messages = (char**)NULL;
 
@@ -91,6 +94,7 @@ static void print_stack_trace(void) {
     if (messages) {
         free(messages);
     }
+#endif
 }
 
 static void signal_handler(int sig, siginfo_t* siginfo, void* context) {
@@ -205,10 +209,11 @@ void OS_InstallSignalHandler(char* program_name) {
         }
         ss.ss_size = 2 * MINSIGSTKSZ;
         ss.ss_flags = 0;
-
+#ifndef __EMSCRIPTEN__
         if (sigaltstack(&ss, NULL) != 0) {
             err(1, "sigaltstack");
         }
+#endif
     }
 
     /* register our signal handlers */

src/harness/platforms/sdl2.c

@@ -137,7 +137,9 @@ static void SDL2_Harness_ProcessWindowMessages(void) {
                     }
                 } else if (event.key.type == SDL_KEYUP) {
                     if (is_only_key_modifier(event.key.keysym.mod, KMOD_ALT)) {
+#ifndef __EMSCRIPTEN__
                         SDL2_SetWindowFullscreen(window, (SDL2_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN_DESKTOP) ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP);
+#endif
                     }
                 }
             }
@@ -318,7 +320,9 @@ static void SDL2_Harness_CreateWindow(const char* title, int width, int height,
     viewport.scale_y = 1;
 
     if (harness_game_config.start_full_screen) {
+#ifndef __EMSCRIPTEN__
         SDL2_SetWindowFullscreen(window, SDL_WINDOW_FULLSCREEN_DESKTOP);
+#endif
     }
 }