Public bug reported:
Binary package hint: libsdl1.2debian
Using some SDL applications on my Ubuntu Dapper installation (e-uae,
some games) I recognized that SDL is VERY slow. I wrote a little test
program that draws rectangles in a window for 5 seconds and counts the
number of drawn rectangles. The program uses SDL and direkt X11 to
compare the speed. I get the following results:
On Ubuntu Dapper:
X11: 100.000 rectangles in 5 seconds
SDL: 750 rectangles in 5 secondes (yes, this is slower than good old Amiga
1000!)
On SuSE 10.1: (same machine, just my old SuSE installation before I
switched to Ubuntu):
X11: 115.000 rectangles in 5 seconds
SDL: 20.000 rectangles in 5 seconds
So SDL seems to be much slower than directly drawing X11 rectangles. But
750 rectangles on Ubuntu is absolutly unacceptable.
Here is the source of my little program:
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <SDL/SDL.h>
#include <X11/Xlib.h>
#define MYWIDTH 1024
#define MYHEIGHT 768
#define RECSIZE 100
#define SECS 5
int
main ()
{
int i;
time_t starttime;
time_t stoptime;
SDL_Surface *surface;
const char *displayname = 0;
Display *display;
Window drawable;
GC gc;
printf ("Start\n");
SDL_Init (SDL_INIT_VIDEO);
surface = SDL_SetVideoMode (MYWIDTH, MYHEIGHT, 0, 0);
time (&starttime);
for (i = 0;; i++)
{
SDL_Rect r;
r.x = i % (MYWIDTH - RECSIZE);
r.y = i % (MYHEIGHT - RECSIZE);
r.w = RECSIZE;
r.h = RECSIZE;
int gun = i & 255;
SDL_FillRect (surface, &r,
SDL_MapRGB (surface->format, gun, gun, gun));
SDL_UpdateRect (surface, r.x, r.y, r.w, r.h);
time (&stoptime);
if (stoptime - starttime >= SECS)
break;
}
time (&stoptime);
printf ("SDL: Drawn %d rectangles in %ds\n",
i, (int) (stoptime - starttime));
SDL_Quit ();
display = XOpenDisplay (displayname);
if (display == 0)
{
fprintf (stderr, "Failed to open X Display\n");
}
else
{
drawable =
XCreateWindow (display,
DefaultRootWindow (display),
0, 0, MYWIDTH, MYHEIGHT, 0,
CopyFromParent,
CopyFromParent, CopyFromParent,
0, 0);
XMapWindow(display,drawable);
gc = XCreateGC (display, drawable, 0, 0);
XSync(display, 0);
XSetForeground(display, gc, 0);
XFillRectangle(display, drawable, gc, 0, 0, MYWIDTH-1,
MYHEIGHT-1);
time (&starttime);
for (i = 0;; i++)
{
int x = i % (MYWIDTH - RECSIZE);
int y = i % (MYHEIGHT - RECSIZE);
int w = RECSIZE;
int h = RECSIZE;
int gun = i & 255;
unsigned long color = (gun << 16) | (gun << 8) | gun;
XSetForeground (display, gc, color);
XFillRectangle (display, drawable, gc, x, y, w, h);
XSync(display,0);
time(&stoptime);
if (stoptime - starttime >= SECS)
break;
}
time (&stoptime);
printf ("X11: Drawn %d rectangles in %ds\n",
i, (int) (stoptime - starttime));
}
printf ("Stop\n");
return 0;
}
** Affects: libsdl1.2 (Ubuntu)
Importance: Untriaged
Status: Unconfirmed
--
SDL graphics is VERY slow on my Ubuntu Dapper installation
https://launchpad.net/bugs/55168
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