Mercurial > sdl-ios-xcode
view test/testlock.c @ 5053:b5b42be9333c
Fixed bug #1026
Vittorio Giovara 2010-07-16 19:09:28 PDT
i was reading SDL_renderer_gles and i noticed that every time we there
is some gl call the gl state is modified with a couple of
glEnableClientState()/glDisableClientState.
While this is completely fine for desktops systems, this is a major
performace kill on mobile devices, right where opengles is
implemented.
Normal practice in this case is to update the glstate once, keep it
always the same and disable/enable other states only in very special
occasions.
On the web there's plenty of documentation (on the top of my head
http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5
) and i personally tried this.
I modified my code and got a 10 fps boost, then modified SDL_render_gles and
shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i
got an 80% performance increase with this technique.
I have attached a dif of my changes, hope that it will be included in
mainstream.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 19 Jan 2011 23:56:16 -0800 |
parents | 0d1b16ee0bca |
children |
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/* Test the thread and mutex locking functions Also exercises the system's signal/thread interaction */ #include <signal.h> #include <stdio.h> #include "SDL.h" #include "SDL_mutex.h" #include "SDL_thread.h" static SDL_mutex *mutex = NULL; static SDL_threadID mainthread; static SDL_Thread *threads[6]; static volatile int doterminate = 0; /* * SDL_Quit() shouldn't be used with atexit() directly because * calling conventions may differ... */ static void SDL_Quit_Wrapper(void) { SDL_Quit(); } void printid(void) { printf("Process %lu: exiting\n", SDL_ThreadID()); } void terminate(int sig) { signal(SIGINT, terminate); doterminate = 1; } void closemutex(int sig) { SDL_threadID id = SDL_ThreadID(); int i; printf("Process %lu: Cleaning up...\n", id == mainthread ? 0 : id); doterminate = 1; for (i = 0; i < 6; ++i) SDL_WaitThread(threads[i], NULL); SDL_DestroyMutex(mutex); exit(sig); } int SDLCALL Run(void *data) { if (SDL_ThreadID() == mainthread) signal(SIGTERM, closemutex); while (!doterminate) { printf("Process %lu ready to work\n", SDL_ThreadID()); if (SDL_mutexP(mutex) < 0) { fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError()); exit(1); } printf("Process %lu, working!\n", SDL_ThreadID()); SDL_Delay(1 * 1000); printf("Process %lu, done!\n", SDL_ThreadID()); if (SDL_mutexV(mutex) < 0) { fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError()); exit(1); } /* If this sleep isn't done, then threads may starve */ SDL_Delay(10); } if (SDL_ThreadID() == mainthread && doterminate) { printf("Process %lu: raising SIGTERM\n", SDL_ThreadID()); raise(SIGTERM); } return (0); } int main(int argc, char *argv[]) { int i; int maxproc = 6; /* Load the SDL library */ if (SDL_Init(0) < 0) { fprintf(stderr, "%s\n", SDL_GetError()); exit(1); } atexit(SDL_Quit_Wrapper); if ((mutex = SDL_CreateMutex()) == NULL) { fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError()); exit(1); } mainthread = SDL_ThreadID(); printf("Main thread: %lu\n", mainthread); atexit(printid); for (i = 0; i < maxproc; ++i) { if ((threads[i] = SDL_CreateThread(Run, NULL)) == NULL) fprintf(stderr, "Couldn't create thread!\n"); } signal(SIGINT, terminate); Run(NULL); return (0); /* Never reached */ }