1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2000-2006 Tim Angus
This file is part of Tremulous.
Tremulous is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Tremulous is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Tremulous; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "cg_local.h"
/*
===============
CG_RunLerpFrame
Sets cg.snap, cg.oldFrame, and cg.backlerp
cg.time should be between oldFrameTime and frameTime after exit
===============
*/
void CG_RunLerpFrame( lerpFrame_t *lf )
{
int f, numFrames;
animation_t *anim;
// debugging tool to get no animations
if( cg_animSpeed.integer == 0 )
{
lf->oldFrame = lf->frame = lf->backlerp = 0;
return;
}
// if we have passed the current frame, move it to
// oldFrame and calculate a new frame
if( cg.time >= lf->frameTime )
{
lf->oldFrame = lf->frame;
lf->oldFrameTime = lf->frameTime;
// get the next frame based on the animation
anim = lf->animation;
if( !anim->frameLerp )
return; // shouldn't happen
if( cg.time < lf->animationTime )
lf->frameTime = lf->animationTime; // initial lerp
else
lf->frameTime = lf->oldFrameTime + anim->frameLerp;
f = ( lf->frameTime - lf->animationTime ) / anim->frameLerp;
numFrames = anim->numFrames;
if( anim->flipflop )
numFrames *= 2;
if( f >= numFrames )
{
f -= numFrames;
if( anim->loopFrames )
{
f %= anim->loopFrames;
f += anim->numFrames - anim->loopFrames;
}
else
{
f = numFrames - 1;
// the animation is stuck at the end, so it
// can immediately transition to another sequence
lf->frameTime = cg.time;
}
}
if( anim->reversed )
lf->frame = anim->firstFrame + anim->numFrames - 1 - f;
else if( anim->flipflop && f >= anim->numFrames )
lf->frame = anim->firstFrame + anim->numFrames - 1 - ( f % anim->numFrames );
else
lf->frame = anim->firstFrame + f;
if( cg.time > lf->frameTime )
{
lf->frameTime = cg.time;
if( cg_debugAnim.integer )
CG_Printf( "Clamp lf->frameTime\n" );
}
}
if( lf->frameTime > cg.time + 200 )
lf->frameTime = cg.time;
if( lf->oldFrameTime > cg.time )
lf->oldFrameTime = cg.time;
// calculate current lerp value
if( lf->frameTime == lf->oldFrameTime )
lf->backlerp = 0;
else
lf->backlerp = 1.0 - (float)( cg.time - lf->oldFrameTime ) / ( lf->frameTime - lf->oldFrameTime );
}
|
