poll workers for non-threaded support, emscripten main loop, remove twn_model.c

CMakeLists.txt

@@ -5,6 +5,8 @@ project(townengine LANGUAGES C)
 set(CMAKE_MESSAGE_LOG_LEVEL "WARNING")
 set(CMAKE_INSTALL_MESSAGE NEVER)
 
+# TODO: test whether webgl 1 is good enough.
+
 # SDL dependencies
 # for whatever reason Emscripten has SDL2 config, but not actual SDL2 port by default
 if(NOT EMSCRIPTEN)
@@ -171,7 +173,8 @@ function(give_options_without_warnings target)
         set(LINK_FLAGS
                 -Bsymbolic-functions
 
-                $<$<BOOL:${EMSCRIPTEN}>:-sLEGACY_GL_EMULATION -sGL_FFP_ONLY -sGL_UNSAFE_OPTS=1>
+                $<$<BOOL:${EMSCRIPTEN}>:-sLEGACY_GL_EMULATION -sGL_FFP_ONLY -sMIN_WEBGL_VERSION=2 -sMAX_WEBGL_VERSION=2
+                        -sENVIRONMENT=web -sDEFAULT_TO_CXX=0>
                 $<$<BOOL:${EMSCRIPTEN}>:--preload-file ${TWN_OUT_DIR}/data@data -sALLOW_MEMORY_GROWTH>
                 $<$<NOT:$<BOOL:${EMSCRIPTEN}>>:-Wl,--as-needed>
                 $<$<BOOL:${LINUX}>:-Wl,--hash-style=gnu>)