changes to build system, emscipten progress (can render solid color, yippie!)

CMakeLists.txt

@@ -148,6 +148,7 @@ function(give_options_without_warnings target)
                 -fno-signed-zeros
                 -fno-trapping-math
                 -freciprocal-math
+                # TODO: require packaging for web case
                 $<$<BOOL:${EMSCRIPTEN}>:-sUSE_SDL=2>)
 
         set(BUILD_FLAGS_RELEASE
@@ -169,7 +170,8 @@ function(give_options_without_warnings target)
         set(LINK_FLAGS
                 -Bsymbolic-functions
 
-                $<$<BOOL:${EMSCRIPTEN}>:-sLEGACY_GL_EMULATION -sGL_FFP_ONLY -sGL_UNSAFE_OPTS>
+                $<$<BOOL:${EMSCRIPTEN}>:-sLEGACY_GL_EMULATION -sGL_FFP_ONLY -sGL_UNSAFE_OPTS=1>
+                $<$<BOOL:${EMSCRIPTEN}>:--preload-file ${TWN_OUT_DIR}/data@data -sALLOW_MEMORY_GROWTH>
                 $<$<NOT:$<BOOL:${EMSCRIPTEN}>>:-Wl,--as-needed>
                 $<$<BOOL:${LINUX}>:-Wl,--hash-style=gnu>)
 
@@ -198,7 +200,6 @@ function(give_options_without_warnings target)
         target_link_options(${target} PUBLIC
                                       ${BUILD_FLAGS}
                                       ${LINK_FLAGS}
-                                      # -Wl,--no-undefined # TODO: use later for implementing no-libc
                                       $<$<CONFIG:Release>:${LINK_FLAGS_RELEASE}>
                                       $<$<CONFIG:Debug>:${BUILD_FLAGS_DEBUG}>)