quake: merge some fixed-point optimizations from PocketQuake

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

1 files changed, 50 insertions, 0 deletions

diff --git a/apps/plugins/sdl/progs/quake/r_main.c b/apps/plugins/sdl/progs/quake/r_main.c
index dc785a850d..7776b46bde 100644
--- a/apps/plugins/sdl/progs/quake/r_main.c
+++ b/apps/plugins/sdl/progs/quake/r_main.c
@@ -62,6 +62,18 @@ vec3_t	vup, base_vup;
 vec3_t  vpn, base_vpn;
 vec3_t  vright, base_vright;
 vec3_t  r_origin;
+#ifdef USE_PQ_OPT1
+int             vup_fxp[3];
+int             vpn_fxp[3];
+int             vright_fxp[3];
+int             xscale_fxp, yscale_fxp;
+int             xcenter_fxp, ycenter_fxp;
+int             r_refdef_fvrectx_adj_fxp;
+int             r_refdef_fvrectright_adj_fxp;
+int             r_refdef_fvrecty_adj_fxp;
+int             r_refdef_fvrectbottom_adj_fxp;
+extern int              modelorg_fxp[3];
+#endif
 
 //
 // screen size info
@@ -421,6 +433,17 @@ void R_ViewChanged (vrect_t *pvrect, int lineadj, float aspect)
         yscaleinv = 1.0 / yscale;
         xscaleshrink = (r_refdef.vrect.width-6)/r_refdef.horizontalFieldOfView;
         yscaleshrink = xscaleshrink*pixelAspect;
+        
+#ifdef USE_PQ_OPT1
+        xscale_fxp=(int)(xscale*8388608.0);     //9.23
+        yscale_fxp=(int)(yscale*8388608.0);     //9.23
+        xcenter_fxp=(int)(xcenter*4194304.0);   //10.22
+        ycenter_fxp=(int)(ycenter*4194304.0);   //10.22
+        r_refdef_fvrectx_adj_fxp=(int)(r_refdef.fvrectx_adj*4194304.0);
+        r_refdef_fvrectright_adj_fxp=(int)(r_refdef.fvrectright_adj*4194304.0);
+        r_refdef_fvrecty_adj_fxp=(int)(r_refdef.fvrecty_adj*4194304.0);
+        r_refdef_fvrectbottom_adj_fxp=(int)(r_refdef.fvrectbottom_adj*4194304.0);
+#endif
 
 // left side clip
         screenedge[0].normal[0] = -1.0 / (xOrigin*r_refdef.horizontalFieldOfView);
@@ -789,6 +812,33 @@ void R_DrawBEntitiesOnList (void)
                         // FIXME: stop transforming twice
                                 R_RotateBmodel ();
 
+#ifdef USE_PQ_OPT1
+                                modelorg_fxp[0]=(int)(modelorg[0]*524288.0);
+                                modelorg_fxp[1]=(int)(modelorg[1]*524288.0);
+                                modelorg_fxp[2]=(int)(modelorg[2]*524288.0);
+
+                                vright_fxp[0]=(int)(256.0/vright[0]);
+                                if (!vright_fxp[0]) vright_fxp[0]=0x7fffffff;
+                                vright_fxp[1]=(int)(256.0/vright[1]);
+                                if (!vright_fxp[1]) vright_fxp[1]=0x7fffffff;
+                                vright_fxp[2]=(int)(256.0/vright[2]);
+                                if (!vright_fxp[2]) vright_fxp[2]=0x7fffffff;
+
+                                vpn_fxp[0]=(int)(256.0/vpn[0]);
+                                if (!vpn_fxp[0]) vpn_fxp[0]=0x7fffffff;
+                                vpn_fxp[1]=(int)(256.0/vpn[1]);
+                                if (!vpn_fxp[1]) vpn_fxp[1]=0x7fffffff;
+                                vpn_fxp[2]=(int)(256.0/vpn[2]);
+                                if (!vpn_fxp[2]) vpn_fxp[2]=0x7fffffff;
+
+                                vup_fxp[0]=(int)(256.0/vup[0]);
+                                if (!vup_fxp[0]) vup_fxp[0]=0x7fffffff;
+                                vup_fxp[1]=(int)(256.0/vup[1]);
+                                if (!vup_fxp[1]) vup_fxp[1]=0x7fffffff;
+                                vup_fxp[2]=(int)(256.0/vup[2]);
+                                if (!vup_fxp[2]) vup_fxp[2]=0x7fffffff;
+#endif
+                                
                         // calculate dynamic lighting for bmodel if it's not an
                         // instanced model
                                 if (clmodel->firstmodelsurface != 0)