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
  14         if (!r->model)
  15                 return;
  16
  17         blend = r->frameblend;
  18
  19         numframes = r->model->numframes;
  20
  21         if (r->frame1 >= numframes)
  22         {
  23                 Con_DPrintf ("CL_LerpAnimation: no such frame %d\n", r->frame1);
  24                 r->frame1 = 0;
  25         }
  26
  27         if (r->frame2 >= numframes)
  28         {
  29                 Con_DPrintf ("CL_LerpAnimation: no such frame %d\n", r->frame2);
  30                 r->frame2 = 0;
  31         }
  32
  33         // note: this could be removed, if the rendering code allows an empty blend array
  34         if (r->frame1 < 0)
  35                 Host_Error ("CL_LerpAnimation: frame1 is NULL\n");
  36
  37         // round off very close blend percentages
  38         if (r->framelerp < (1.0f / 65536.0f))
  39                 r->framelerp = 0;
  40         if (r->framelerp >= (65535.0f / 65536.0f))
  41                 r->framelerp = 1;
  42
  43         blend[0].frame = blend[1].frame = blend[2].frame = blend[3].frame = 0;
  44         blend[0].lerp = blend[1].lerp = blend[2].lerp = blend[3].lerp = 0;
  45         if (r->model->animscenes)
  46         {
  47                 if (r->framelerp < 1 && r->frame1 >= 0)
  48                 {
  49                         scene = r->model->animscenes + r->frame1;
  50                         lerp = 1 - r->framelerp;
  51
  52                         if (scene->framecount > 1)
  53                         {
  54                                 sublerp = scene->framerate * (cl.time - r->frame1time);
  55                                 sub1 = (int) (sublerp);
  56                                 sub2 = sub1 + 1;
  57                                 sublerp -= sub1;
  58                                 if (sublerp < (1.0f / 65536.0f))
  59                                         sublerp = 0;
  60                                 if (sublerp >= (65535.0f / 65536.0f))
  61                                         sublerp = 1;
  62                                 if (scene->loop)
  63                                 {
  64                                         sub1 = (sub1 % scene->framecount);
  65                                         sub2 = (sub2 % scene->framecount);
  66                                 }
  67                                 else
  68                                 {
  69                                         sub1 = bound(0, sub1, (scene->framecount - 1));
  70                                         sub2 = bound(0, sub2, (scene->framecount - 1));
  71                                 }
  72                                 sub1 += scene->firstframe;
  73                                 sub2 += scene->firstframe;
  74                                 f = sub1;
  75                                 d = (1 - sublerp) * lerp;
  76 #define FRAMEBLENDINSERT\
  77                                 if (d > 0)\
  78                                 {\
  79                                         for (i = 0;i < 4;i++)\
  80                                         {\
  81                                                 if (blend[i].frame == f)\
  82                                                 {\
  83                                                         blend[i].lerp += d;\
  84                                                         break;\
  85                                                 }\
  86                                                 if (blend[i].lerp <= 0)\
  87                                                 {\
  88                                                         blend[i].frame = f;\
  89                                                         blend[i].lerp = d;\
  90                                                         break;\
  91                                                 }\
  92                                         }\
  93                                 }
  94                                 FRAMEBLENDINSERT
  95                                 f = sub2;
  96                                 d = sublerp * lerp;
  97                         }
  98                         else
  99                         {
 100                                 f = scene->firstframe;
 101                                 d = lerp;
 102                         }
 103                         FRAMEBLENDINSERT
 104                 }
 105                 if (r->framelerp > 0 && r->frame2 >= 0)
 106                 {
 107                         scene = r->model->animscenes + r->frame2;
 108                         lerp = r->framelerp;
 109
 110                         if (scene->framecount > 1)
 111                         {
 112                                 sublerp = scene->framerate * (cl.time - r->frame1time);
 113                                 sub1 = (int) (sublerp);
 114                                 sub2 = sub1 + 1;
 115                                 sublerp -= sub1;
 116                                 if (sublerp < (1.0f / 65536.0f))
 117                                         sublerp = 0;
 118                                 if (sublerp >= (65535.0f / 65536.0f))
 119                                         sublerp = 1;
 120                                 if (scene->loop)
 121                                 {
 122                                         sub1 = (sub1 % scene->framecount);
 123                                         sub2 = (sub2 % scene->framecount);
 124                                 }
 125                                 else
 126                                 {
 127                                         sub1 = bound(0, sub1, (scene->framecount - 1));
 128                                         sub2 = bound(0, sub2, (scene->framecount - 1));
 129                                 }
 130                                 sub1 += scene->firstframe;
 131                                 sub2 += scene->firstframe;
 132                                 f = sub1;
 133                                 d = (1 - sublerp) * lerp;
 134                                 FRAMEBLENDINSERT
 135                                 f = sub2;
 136                                 d = sublerp * lerp;
 137                         }
 138                         else
 139                         {
 140                                 f = scene->firstframe;
 141                                 d = lerp;
 142                         }
 143                         FRAMEBLENDINSERT
 144                 }
 145         }
 146         else
 147         {
 148                 // if there are no scenes, assume it is all single-frame groups
 149                 if (r->framelerp < 1 && r->frame1 >= 0)
 150                 {
 151                         f = r->frame1;
 152                         d = 1 - r->framelerp;
 153                         FRAMEBLENDINSERT
 154                 }
 155                 if (r->framelerp > 0 && r->frame2 >= 0)
 156                 {
 157                         f = r->frame2;
 158                         d = r->framelerp;
 159                         FRAMEBLENDINSERT
 160                 }
 161         }
 162 }
 163