Re-enable threads for emscripten;

They don't appear to work very well but this simplifies code a lot.

CMakeLists.txt

@@ -225,7 +225,7 @@ if(NOT EMSCRIPTEN)
 endif()
 
 # pthreads
-if(NOT WIN32 AND NOT EMSCRIPTEN)
+if(NOT WIN32)
   set(THREADS_PREFER_PTHREAD_FLAG ON)
   find_package(Threads REQUIRED)
   set(LOVR_PTHREADS Threads::Threads)
@@ -242,11 +242,13 @@ set(LOVR_SRC
   src/api/lovr.c
   src/api/math.c
   src/api/physics.c
+  src/api/thread.c
   src/api/timer.c
   src/api/types/animator.c
   src/api/types/audioStream.c
   src/api/types/blob.c
   src/api/types/canvas.c
+  src/api/types/channel.c
   src/api/types/collider.c
   src/api/types/controller.c
   src/api/types/font.c
@@ -265,6 +267,7 @@ set(LOVR_SRC
   src/api/types/source.c
   src/api/types/texture.c
   src/api/types/textureData.c
+  src/api/types/thread.c
   src/api/types/transform.c
   src/api/types/vertexData.c
   src/api/types/world.c
@@ -297,6 +300,7 @@ set(LOVR_SRC
   src/lib/stb/stb_image_write.c
   src/lib/stb/stb_truetype.c
   src/lib/stb/stb_vorbis.c
+  src/lib/tinycthread/tinycthread.c
   src/lib/vec/vec.c
   src/lovr.c
   src/luax.c
@@ -309,6 +313,8 @@ set(LOVR_SRC
   src/math/vec3.c
   src/physics/physics.c
   src/resources/shaders.c
+  src/thread/channel.c
+  src/thread/thread.c
   src/timer/timer.c
   src/util.c
   ${LOVR_AUDIO_SRC}
@@ -318,15 +324,7 @@ set(LOVR_SRC
 if(EMSCRIPTEN)
   set(LOVR_SRC ${LOVR_SRC} src/headset/webvr.c)
 else()
-  set(LOVR_SRC ${LOVR_SRC}
-    src/headset/openvr.c
-    src/api/thread.c
-    src/api/types/channel.c
-    src/api/types/thread.c
-    src/lib/tinycthread/tinycthread.c
-    src/thread/channel.c
-    src/thread/thread.c
-  )
+  set(LOVR_SRC ${LOVR_SRC} src/headset/openvr.c)
 endif()
 
 # LÖVR

src/api/event.c

@@ -88,13 +88,11 @@ static int nextEvent(lua_State* L) {
       lua_pushboolean(L, event.data.boolean.value);
       return 2;
 
-#ifndef EMSCRIPTEN
     case EVENT_THREAD_ERROR:
       luax_pushobject(L, event.data.thread.thread);
       lua_pushstring(L, event.data.thread.error);
       free((void*) event.data.thread.error);
       return 3;
-#endif
 
     case EVENT_CONTROLLER_ADDED:
     case EVENT_CONTROLLER_REMOVED:

src/api/lovr.c

@@ -19,11 +19,7 @@ int l_lovrInit(lua_State* L) {
   luax_preloadmodule(L, "lovr.headset", l_lovrHeadsetInit);
   luax_preloadmodule(L, "lovr.math", l_lovrMathInit);
   luax_preloadmodule(L, "lovr.physics", l_lovrPhysicsInit);
-#ifdef EMSCRIPTEN
-  luax_preloadmodule(L, "lovr.thread", luax_emptymodule);
-#else
   luax_preloadmodule(L, "lovr.thread", l_lovrThreadInit);
-#endif
   luax_preloadmodule(L, "lovr.timer", l_lovrTimerInit);
   luax_preloadmodule(L, "json", luaopen_cjson);
   luax_preloadmodule(L, "enet", luaopen_enet);

src/event/event.h

@@ -1,7 +1,5 @@
 #include "headset/headset.h"
-#ifndef EMSCRIPTEN
 #include "thread/thread.h"
-#endif
 #include "lib/vec/vec.h"
 #include <stdbool.h>
 
@@ -52,12 +50,10 @@ typedef struct {
   bool value;
 } BoolEvent;
 
-#ifndef EMSCRIPTEN
 typedef struct {
   Thread* thread;
   const char* error;
 } ThreadEvent;
-#endif
 
 typedef struct {
   Controller* controller;
@@ -73,9 +69,7 @@ typedef struct {
 typedef union {
   QuitEvent quit;
   BoolEvent boolean;
-#ifndef EMSCRIPTEN
   ThreadEvent thread;
-#endif
   ControllerEvent controller;
   CustomEvent custom;
 } EventData;

src/lovr.c

@@ -6,9 +6,7 @@
 #include "headset/headset.h"
 #include "math/math.h"
 #include "physics/physics.h"
-#ifndef EMSCRIPTEN
 #include "thread/thread.h"
-#endif
 #include "timer/timer.h"
 #include "resources/boot.lua.h"
 #include "lib/glfw.h"

src/luax.c

@@ -21,11 +21,6 @@ int luax_preloadmodule(lua_State* L, const char* key, lua_CFunction f) {
   return 0;
 }
 
-int luax_emptymodule(lua_State* L) {
-  lua_pushnil(L);
-  return 1;
-}
-
 void luax_registerloader(lua_State* L, lua_CFunction loader, int index) {
   lua_getglobal(L, "table");
   lua_getfield(L, -1, "insert");

src/luax.h

@@ -10,7 +10,6 @@
 #define luax_checktype(L, i, T) ((T*) _luax_checktype(L, i, #T))
 
 int luax_preloadmodule(lua_State* L, const char* key, lua_CFunction f);
-int luax_emptymodule(lua_State* L);
 void luax_registerloader(lua_State* L, lua_CFunction loader, int index);
 void luax_registertype(lua_State* L, const char* name, const luaL_Reg* functions);
 void luax_extendtype(lua_State* L, const char* base, const char* name, const luaL_Reg* baseFunctions, const luaL_Reg* functions);

src/util.h

@@ -1,9 +1,5 @@
 #include "lib/vec/vec.h"
-#ifdef EMSCRIPTEN
-#define _Thread_local
-#else
 #include "lib/tinycthread/tinycthread.h"
-#endif
 #include <stdint.h>
 #include <stddef.h>