Has anyone yet looked into ways to improve rendering performance? I
have noticed that glXSwapBuffers() is slow (30secs +/-5secs on a
P3/600Mhz) and mainly spends its time in PsOutImageBytes() which calls
sprintf() in a tight loop:
(gdb) where
#0 PsOut_OutImageBytes (self=0x8c91ed0, nBytes=3, bytes=0xbfffec7d
"") at psout.c:1488
#1 0x080d63af in PsPutScaledImage (pDrawable=0x8a69eb0,
pGC=0x8c6f640, depth=24, x=0, y=0, w=9321, h=13431, leftPad=0,
format=2, imageRes=0,
pImage=0x4066e008 "") at PsArea.c:157
#2 0x080d6a79 in PsPutImage (pDrawable=0x8a69eb0, pGC=0x8c6f640,
depth=24, x=0, y=0, w=9321, h=13431, leftPad=0, format=2,
pImage=0x4066e008 "") at PsArea.c:332
#3 0x08291717 in XMesaSwapBuffers (b=0x4063d008) at xm_api.c:2391
#4 0x0828dca9 in __MESA_swapBuffers (glxPriv=0x8c6f178) at xf86glx.c:736
#5 0x0825a00f in __glXSwapBuffers (cl=0x8a69c60, pc=0x8c90a40
"\220\v\003") at glxcmds.c:1340
#6 0x082300ff in __glXDispatch (client=0x8a647b0) at glxext.c:435
#7 0x08083b69 in Dispatch () at dispatch.c:449
#8 0x0806a790 in main (argc=8, argv=0xbffff2a4, envp=0xbffff2c8) at main.c:439
#9 0x400e48ae in __libc_start_main () from /lib/libc.so.6
Well, at line 2391 of xm_api.c, XMesaXPutImage() is being called. That's a macro:
#define XMesaPutImage(__d,__b,__gc,__i,__sx,__sy,__x,__y,__w,__h) \
do { \
/* Assumes: Images are always in ZPixmap format */ \
(void) __d; \
if (__sx || __sy) /* The non-trivial case */ \
XMesaPutImageHelper(__d,__b,__gc,__i,__sx,__sy,__x,__y,__w,__h); \
ValidateGC(__b, __gc); \
(*__gc->ops->PutImage)(__b, __gc, ((XMesaDrawable)(__b))->depth, \
__x, __y, __w, __h, 0, ZPixmap, \
((XMesaImage *)(__i))->data); \
} while (0)The PsPutImage() function is an internal server function in the Xprint module. I have no idea why that would be getting called.
-Brian
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