devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

quake: merge some fixed-point optimizations from PocketQuake

Browse source 
The PocketQuake project, available below, has some nice fixed-point code:

https://web.archive.org/web/20150412233306/http://quake.pocketmatrix.com/PocketQuake0062_src.zip

I'd like to see most of them merged into our Quake port. This commit
gives +0.9FPS on ipod6g. (A big change given that it was running at
only 9.7FPS to begin with!)

Change-Id: I91931bdd5c22f14fb28616de938a03b4e7d7b076
This commit is contained in:
Franklin Wei 2019-08-09 20:08:10 -04:00
parent 3fffabf50d
commit ee70dad305
10 changed files with 866 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

97
apps/plugins/sdl/progs/quake/d_polyse.c
View file

@ -122,6 +122,7 @@ void D_PolysetScanLeftEdge (int height);
D_PolysetDraw
================
*/
#ifndef USE_PQ_OPT
void D_PolysetDraw (void)
{
spanpackage_t spans[DPS_MAXSPANS + 1 +
@ -140,7 +141,21 @@ void D_PolysetDraw (void)
D_DrawNonSubdiv ();
}
}
#else
//JB: Optimization
//Dan East: May result in image quality loss. Actual performance gain not verified.
void D_PolysetDraw (void)
{
spanpackage_t spans[DPS_MAXSPANS + 1 +
((CACHE_SIZE - 1) / sizeof(spanpackage_t)) + 1];
// one extra because of cache line pretouching
a_spans = (spanpackage_t *)
(((long)&spans[0] + CACHE_SIZE - 1) & ~(CACHE_SIZE - 1));
D_DrawNonSubdiv ();
}
#endif
/*
================
@ -528,6 +543,7 @@ void D_PolysetSetUpForLineScan(fixed8_t startvertu, fixed8_t startvertv,
D_PolysetCalcGradients
================
*/
#ifndef USE_PQ_OPT4
void D_PolysetCalcGradients (int skinwidth)
{
float xstepdenominv, ystepdenominv, t0, t1;
@ -583,7 +599,88 @@ void D_PolysetCalcGradients (int skinwidth)
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
}
#else
void D_PolysetCalcGradients (int skinwidth)
{
//Dan East: Fixed point conversion
int p01_minus_p21, p11_minus_p21, p00_minus_p20, p10_minus_p20, t0, t1;
int tmp, ydenom;
//float xstepdenominv = (float)(1.0 / (float)d_xdenom);
//float ystepdenominv = -xstepdenominv;
//int checkx, checky;
p00_minus_p20 = (r_p0[0] - r_p2[0]);
p01_minus_p21 = (r_p0[1] - r_p2[1]);
p10_minus_p20 = (r_p1[0] - r_p2[0]);
p11_minus_p21 = (r_p1[1] - r_p2[1]);
//xstepdenominv = d_xdenom;
ydenom=-d_xdenom;
//ystepdenominv = -xstepdenominv;
t0 = (r_p0[4] - r_p2[4]);
t1 = (r_p1[4] - r_p2[4]);
//TODO: Ceil has been removed
tmp=t1 * p01_minus_p21 - t0 * p11_minus_p21;
r_lstepx = tmp / d_xdenom;
if (tmp%d_xdenom) r_lstepx++;
tmp=t1 * p00_minus_p20 - t0 * p10_minus_p20;
r_lstepy = tmp / ydenom;
if (tmp%ydenom) r_lstepy++;
/*
checkx = (int)ceil((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
checky = (int)ceil((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
if (checkx-r_lstepx>1||checkx-r_lstepx<-1)
r_lstepx=r_lstepx;
if (checky-r_lstepy>1||checky-r_lstepy<-1)
r_lstepy=r_lstepy;
*/
t0 = (r_p0[2] - r_p2[2]);
t1 = (r_p1[2] - r_p2[2]);
r_sstepx = (t1 * p01_minus_p21 - t0 * p11_minus_p21) / d_xdenom;
r_sstepy = (t1 * p00_minus_p20 - t0* p10_minus_p20) / ydenom;
/*
checkx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
checky = (int)((t1 * p00_minus_p20 - t0* p10_minus_p20) * ystepdenominv);
if (checkx-r_sstepx>1||checkx-r_sstepx<-1)
r_lstepx=r_lstepx;
if (checky-r_sstepy>1||checky-r_sstepy<-1)
r_lstepy=r_lstepy;
*/
t0 = (r_p0[3] - r_p2[3]);
t1 = (r_p1[3] - r_p2[3]);
r_tstepx = (t1 * p01_minus_p21 - t0 * p11_minus_p21) / d_xdenom;
r_tstepy = (t1 * p00_minus_p20 - t0 * p10_minus_p20) / ydenom;
/*
checkx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
checky = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
if (checkx-r_tstepx>1||checkx-r_tstepx<-1)
r_lstepx=r_lstepx;
if (checky-r_tstepy>1||checky-r_tstepy<-1)
r_lstepy=r_lstepy;
*/
t0 = (r_p0[5] - r_p2[5]);
t1 = (r_p1[5] - r_p2[5]);
r_zistepx = (t1 * p01_minus_p21 - t0 * p11_minus_p21) / d_xdenom;
r_zistepy = (t1 * p00_minus_p20 - t0 * p10_minus_p20) / ydenom;
/*
checkx = (int)((t1 * p01_minus_p21 - t0 * p11_minus_p21) * xstepdenominv);
checky = (int)((t1 * p00_minus_p20 - t0 * p10_minus_p20) * ystepdenominv);
if (checkx-r_zistepx>1||checkx-r_zistepx<-1)
r_lstepx=checkx;
if (checky-r_zistepy>1||checky-r_zistepy<-1)
r_lstepy=checky;
*/
a_sstepxfrac = r_sstepx & 0xFFFF;
a_tstepxfrac = r_tstepx & 0xFFFF;
a_ststepxwhole = skinwidth * (r_tstepx >> 16) + (r_sstepx >> 16);
}
#endif
#endif // !id386