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 || !r->model->type)
  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         // check r_lerpmodels and round off very close blend percentages
  38         if (!r_lerpmodels.integer)
  39                 r->framelerp = 1;
  40         else if (r->framelerp >= (65535.0f / 65536.0f))
  41                 r->framelerp = 1;
  42         else if (r->framelerp < (1.0f / 65536.0f))
  43                 r->framelerp = 0;
  44
  45         blend[0].frame = blend[1].frame = blend[2].frame = blend[3].frame = 0;
  46         blend[0].lerp = blend[1].lerp = blend[2].lerp = blend[3].lerp = 0;
  47         if (r->model->animscenes)
  48         {
  49                 if (r->framelerp < 1 && r->frame1 >= 0)
  50                 {
  51                         scene = r->model->animscenes + r->frame1;
  52                         lerp = 1 - r->framelerp;
  53
  54                         if (scene->framecount > 1)
  55                         {
  56                                 sublerp = scene->framerate * (cl.time - r->frame1time);
  57                                 sub1 = (int) (sublerp);
  58                                 sub2 = sub1 + 1;
  59                                 sublerp -= sub1;
  60                                 if (!r_lerpmodels.integer)
  61                                         sublerp = 1;
  62                                 else if (sublerp >= (65535.0f / 65536.0f))
  63                                         sublerp = 1;
  64                                 else if (sublerp < (1.0f / 65536.0f))
  65                                         sublerp = 0;
  66                                 if (scene->loop)
  67                                 {
  68                                         sub1 = (sub1 % scene->framecount);
  69                                         sub2 = (sub2 % scene->framecount);
  70                                 }
  71                                 else
  72                                 {
  73                                         sub1 = bound(0, sub1, (scene->framecount - 1));
  74                                         sub2 = bound(0, sub2, (scene->framecount - 1));
  75                                 }
  76                                 sub1 += scene->firstframe;
  77                                 sub2 += scene->firstframe;
  78                                 f = sub1;
  79                                 d = (1 - sublerp) * lerp;
  80 #define FRAMEBLENDINSERT\
  81                                 if (d > 0)\
  82                                 {\
  83                                         for (i = 0;i < 4;i++)\
  84                                         {\
  85                                                 if (blend[i].frame == f)\
  86                                                 {\
  87                                                         blend[i].lerp += d;\
  88                                                         break;\
  89                                                 }\
  90                                                 if (blend[i].lerp <= 0)\
  91                                                 {\
  92                                                         blend[i].frame = f;\
  93                                                         blend[i].lerp = d;\
  94                                                         break;\
  95                                                 }\
  96                                         }\
  97                                 }
  98                                 FRAMEBLENDINSERT
  99                                 f = sub2;
 100                                 d = sublerp * lerp;
 101                         }
 102                         else
 103                         {
 104                                 f = scene->firstframe;
 105                                 d = lerp;
 106                         }
 107                         FRAMEBLENDINSERT
 108                 }
 109                 if (r->framelerp > 0 && r->frame2 >= 0)
 110                 {
 111                         scene = r->model->animscenes + r->frame2;
 112                         lerp = r->framelerp;
 113
 114                         if (scene->framecount > 1)
 115                         {
 116                                 sublerp = scene->framerate * (cl.time - r->frame1time);
 117                                 sub1 = (int) (sublerp);
 118                                 sub2 = sub1 + 1;
 119                                 sublerp -= sub1;
 120                                 if (!r_lerpmodels.integer)
 121                                         sublerp = 1;
 122                                 else if (sublerp >= (65535.0f / 65536.0f))
 123                                         sublerp = 1;
 124                                 else if (sublerp < (1.0f / 65536.0f))
 125                                         sublerp = 0;
 126                                 if (scene->loop)
 127                                 {
 128                                         sub1 = (sub1 % scene->framecount);
 129                                         sub2 = (sub2 % scene->framecount);
 130                                 }
 131                                 else
 132                                 {
 133                                         sub1 = bound(0, sub1, (scene->framecount - 1));
 134                                         sub2 = bound(0, sub2, (scene->framecount - 1));
 135                                 }
 136                                 sub1 += scene->firstframe;
 137                                 sub2 += scene->firstframe;
 138                                 f = sub1;
 139                                 d = (1 - sublerp) * lerp;
 140                                 FRAMEBLENDINSERT
 141                                 f = sub2;
 142                                 d = sublerp * lerp;
 143                         }
 144                         else
 145                         {
 146                                 f = scene->firstframe;
 147                                 d = lerp;
 148                         }
 149                         FRAMEBLENDINSERT
 150                 }
 151         }
 152         else
 153         {
 154                 // if there are no scenes, assume it is all single-frame groups
 155                 if (r->framelerp < 1 && r->frame1 >= 0)
 156                 {
 157                         f = r->frame1;
 158                         d = 1 - r->framelerp;
 159                         FRAMEBLENDINSERT
 160                 }
 161                 if (r->framelerp > 0 && r->frame2 >= 0)
 162                 {
 163                         f = r->frame2;
 164                         d = r->framelerp;
 165                         FRAMEBLENDINSERT
 166                 }
 167         }
 168 }
 169