r_lerpanim.c

   1 #include "quakedef.h"
   2
   3 // LordHavoc: quite tempting to break apart this function to reuse the
   4 //            duplicated code, but I suspect it is better for performance
   5 //            this way
   6 // LordHavoc: later note: made FRAMEBLENDINSERT macro
   7 void R_LerpAnimation(entity_render_t *r)
   8 {
   9         int sub1, sub2, numframes, f, i;
  10         double sublerp, lerp, d;
  11         animscene_t *scene;
  12         frameblend_t *blend;
  13         blend = r->frameblend;
  14
  15         numframes = r->model->numframes;
  16
  17         if (r->frame1 >= numframes)
  18         {
  19                 Con_DPrintf ("CL_LerpAnimation: no such frame %d\n", r->frame1);
  20                 r->frame1 = 0;
  21         }
  22
  23         if (r->frame2 >= numframes)
  24         {
  25                 Con_DPrintf ("CL_LerpAnimation: no such frame %d\n", r->frame2);
  26                 r->frame2 = 0;
  27         }
  28
  29         // note: this could be removed, if the rendering code allows an empty blend array
  30         if (r->frame1 < 0)
  31                 Host_Error ("CL_LerpAnimation: frame1 is NULL\n");
  32
  33         // round off very close blend percentages
  34         if (r->framelerp < (1.0f / 65536.0f))
  35                 r->framelerp = 0;
  36         if (r->framelerp >= (65535.0f / 65536.0f))
  37                 r->framelerp = 1;
  38
  39         blend[0].frame = blend[1].frame = blend[2].frame = blend[3].frame = 0;
  40         blend[0].lerp = blend[1].lerp = blend[2].lerp = blend[3].lerp = 0;
  41         if (r->model->animscenes)
  42         {
  43                 if (r->framelerp < 1 && r->frame1 >= 0)
  44                 {
  45                         scene = r->model->animscenes + r->frame1;
  46                         lerp = 1 - r->framelerp;
  47
  48                         if (scene->framecount > 1)
  49                         {
  50                                 sublerp = scene->framerate * (cl.time - r->frame1time);
  51                                 sub1 = (int) (sublerp);
  52                                 sub2 = sub1 + 1;
  53                                 sublerp -= sub1;
  54                                 if (sublerp < (1.0f / 65536.0f))
  55                                         sublerp = 0;
  56                                 if (sublerp >= (65535.0f / 65536.0f))
  57                                         sublerp = 1;
  58                                 if (scene->loop)
  59                                 {
  60                                         sub1 = (sub1 % scene->framecount);
  61                                         sub2 = (sub2 % scene->framecount);
  62                                 }
  63                                 else
  64                                 {
  65                                         sub1 = bound(0, sub1, (scene->framecount - 1));
  66                                         sub2 = bound(0, sub2, (scene->framecount - 1));
  67                                 }
  68                                 sub1 += scene->firstframe;
  69                                 sub2 += scene->firstframe;
  70                                 f = sub1;
  71                                 d = (1 - sublerp) * lerp;
  72 #define FRAMEBLENDINSERT\
  73                                 if (d > 0)\
  74                                 {\
  75                                         for (i = 0;i < 4;i++)\
  76                                         {\
  77                                                 if (blend[i].frame == f)\
  78                                                 {\
  79                                                         blend[i].lerp += d;\
  80                                                         break;\
  81                                                 }\
  82                                                 if (blend[i].lerp <= 0)\
  83                                                 {\
  84                                                         blend[i].frame = f;\
  85                                                         blend[i].lerp = d;\
  86                                                         break;\
  87                                                 }\
  88                                         }\
  89                                 }
  90                                 FRAMEBLENDINSERT
  91                                 f = sub2;
  92                                 d = sublerp * lerp;
  93                         }
  94                         else
  95                         {
  96                                 f = scene->firstframe;
  97                                 d = lerp;
  98                         }
  99                         FRAMEBLENDINSERT
 100                 }
 101                 if (r->framelerp > 0 && r->frame2 >= 0)
 102                 {
 103                         scene = r->model->animscenes + r->frame2;
 104                         lerp = r->framelerp;
 105
 106                         if (scene->framecount > 1)
 107                         {
 108                                 sublerp = scene->framerate * (cl.time - r->frame1time);
 109                                 sub1 = (int) (sublerp);
 110                                 sub2 = sub1 + 1;
 111                                 sublerp -= sub1;
 112                                 if (sublerp < (1.0f / 65536.0f))
 113                                         sublerp = 0;
 114                                 if (sublerp >= (65535.0f / 65536.0f))
 115                                         sublerp = 1;
 116                                 if (scene->loop)
 117                                 {
 118                                         sub1 = (sub1 % scene->framecount);
 119                                         sub2 = (sub2 % scene->framecount);
 120                                 }
 121                                 else
 122                                 {
 123                                         sub1 = bound(0, sub1, (scene->framecount - 1));
 124                                         sub2 = bound(0, sub2, (scene->framecount - 1));
 125                                 }
 126                                 sub1 += scene->firstframe;
 127                                 sub2 += scene->firstframe;
 128                                 f = sub1;
 129                                 d = (1 - sublerp) * lerp;
 130                                 FRAMEBLENDINSERT
 131                                 f = sub2;
 132                                 d = sublerp * lerp;
 133                         }
 134                         else
 135                         {
 136                                 f = scene->firstframe;
 137                                 d = lerp;
 138                         }
 139                         FRAMEBLENDINSERT
 140                 }
 141         }
 142         else
 143         {
 144                 // if there are no scenes, assume it is all single-frame groups
 145                 if (r->framelerp < 1 && r->frame1 >= 0)
 146                 {
 147                         f = r->frame1;
 148                         d = 1 - r->framelerp;
 149                         FRAMEBLENDINSERT
 150                 }
 151                 if (r->framelerp > 0 && r->frame2 >= 0)
 152                 {
 153                         f = r->frame2;
 154                         d = r->framelerp;
 155                         FRAMEBLENDINSERT
 156                 }
 157         }
 158         //Con_Printf("Lerp: %i:%f %i:%f %i:%f %i:%f\n", blend[0].frame, blend[0].lerp, blend[1].frame, blend[1].lerp, blend[2].frame, blend[2].lerp, blend[3].frame, blend[3].lerp);
 159 }
 160