Fix build failure on Linux when using slightly older SDL2 like 2.0.16

Signed-off-by: Lilis Iskandar <[email protected]>

sdl/system_linux.go

@@ -31,17 +31,25 @@ static int SDL_LinuxSetThreadPriorityAndPolicy(Sint64 threadID, int sdlPriority,
 */
 import "C"
 
-// https://wiki.libsdl.org/SDL_LinuxSetThreadPriorityAndPolicy
+// LinuxSetThreadPriority sets the UNIX nice value for a thread.
+//
+// This uses setpriority() if possible, and RealtimeKit if available.
+//
+// (https://wiki.libsdl.org/SDL_LinuxSetThreadPriority)
 func LinuxSetThreadPriority(threadID int64, priority int) (err error) {
 	_threadID := C.Sint64(threadID)
 	_priority := C.int(priority)
-	return errorFromInt(C.SDL_LinuxSetThreadPriority(_threadID, _priority))
+	return errorFromInt(int(C.SDL_LinuxSetThreadPriority(_threadID, _priority)))
 }
 
-// https://wiki.libsdl.org/SDL_LinuxSetThreadPriorityAndPolicy
-func LinuxSetThreadPriorityAndPolicy(threadID int64, sdlPriority, schedPolicy int) bool {
+// LinuxSetThreadPriority sets the priority (not nice level) and scheduling policy for a thread.
+//
+// This uses setpriority() if possible, and RealtimeKit if available.
+//
+// (https://wiki.libsdl.org/SDL_LinuxSetThreadPriorityAndPolicy)
+func LinuxSetThreadPriorityAndPolicy(threadID int64, sdlPriority, schedPolicy int) (err error) {
 	_threadID := C.Sint64(threadID)
 	_sdlPriority := C.int(sdlPriority)
 	_schedPolicy := C.int(schedPolicy)
-	return errorFromInt(C.SDL_LinuxSetThreadPriority(_threadID, _sdlPriority, _schedPolicy))
+	return errorFromInt(int(C.SDL_LinuxSetThreadPriorityAndPolicy(_threadID, _sdlPriority, _schedPolicy)))
 }

sdl/video.go

@@ -212,8 +212,8 @@ static void SDL_SetWindowKeyboardGrab(SDL_Window * window, SDL_bool grabbed)
 #pragma message("SDL_GetWindowMouseRect is not supported before SDL 2.0.18")
 #endif
 
-static const int SDL_WINDOWEVENT_ICCPROF_CHANGED = 17; // The ICC profile of the window's display has changed.
-static const int SDL_WINDOWEVENT_DISPLAY_CHANGED = 18; // Window has been moved to display data1.
+#define SDL_WINDOWEVENT_ICCPROF_CHANGED (17) // The ICC profile of the window's display has changed.
+#define SDL_WINDOWEVENT_DISPLAY_CHANGED (18) // Window has been moved to display data1.
 
 static void* SDLCALL SDL_GetWindowICCProfile(SDL_Window * window, size_t* size)
 {