Mail Archives: djgpp/1997/07/25/14:57:34
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from: csantill AT lausd DOT k12 DOT ca DOT us
Well that's great because I didn't the type of pointer made a
difference.
I did the farnspokel optimizations on my own that you were talking about
& I found a 212% speed increase(from 90 FPS to 192 FPS) on my system.
If
you could, & it wouldn't be too much trouble, could you test my code for
me
on your 486. Thanx!
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#include <sys/farptr.h>
#include <sys/nearptr.h>
#include <dpmi.h>
#include <go32.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
enum GR_MODE{GR_INVALID=-1, GR_TEXT=0x03, GR_VGA=0x13};
enum GR_MODE Set_GR_Mode(enum GR_MODE mode)
{
__dpmi_regs r;
memset(&r, 0, sizeof(r));
r.x.ax=mode;
return(__dpmi_int(0x10,&r) ? GR_INVALID:mode);
}
void Put_Pix_Far(int x, int y, int c)
{
_farpokeb(_dos_ds, 0xA0000+y*320+x,c);
return;
}
void Put_Pix_Near(int x, int y, char c)
{
char *v_m=(char *)(0xA0000+__djgpp_conventional_base);
v_m[(y<<8)+(y<<6)+x] = c;
}
void fill_screen(char c)
{
int x,y;
unsigned long color=c+(long)(c<<8)+(long)(c<<16)+(long)(c<<24);
_farsetsel(_dos_ds);
for(y=0; y<200; y++)
for(x=0; x<320; x=x+4)
_farnspokel(0xA0000+(y<<8)+(y<<6)+x, color);
}
// ********************************************************************
int main(void)
{
int x, y, co;
uclock_t st[3], et[3];
if(GR_INVALID==Set_GR_Mode(GR_VGA))
{
printf("Error setting mode 13h\n");
exit(8);
}
st[0]=uclock();
for(co=0; co<7680; co++)
for(y=0; y<200; y++)
for(x=0; x<320; x++)
Put_Pix_Far(x,y,co%256);
et[0]=uclock();
st[1]=uclock();
__djgpp_nearptr_enable();
for(co=0; co<7680; co++)
for(y=0; y<200; y++)
for(x=0; x<320; x++)
Put_Pix_Near(x,y,co%256);
__djgpp_nearptr_disable();
et[1]=uclock();
st[2]=uclock();
for(co=0; co<7680; co++)
fill_screen(co % 256);
et[2]=uclock();
getchar();
Set_GR_Mode(GR_TEXT);
for(co=0; co<3; co++)
printf("%i. FPS = %3.2f\n",co+1, (float)7680/((float)((et[co]-
st[co])/UCLOCKS_PER_SEC)));
printf("1 = Far Ptr\n2 = Near Ptr\n3 = FarnspokeL Fill screen\n");
getchar();
return 0;
}
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