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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ SGI"; |
5 |
#endif |
6 |
|
7 |
/* |
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* sm_ogl.c |
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*/ |
10 |
#include "standard.h" |
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|
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#include <GL/gl.h> |
13 |
|
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#ifdef TEST_DRIVER |
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#include <gl/device.h> |
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#include <GL/glu.h> |
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#include <glut.h> |
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#endif |
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#include "object.h" |
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#include "sm_list.h" |
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#include "sm_geom.h" |
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#include "sm.h" |
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|
24 |
#ifdef TEST_DRIVER |
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#include "sm_draw.h" |
26 |
/*static char smClean_notify = TRUE; |
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MAKE STATIC LATER: ui.c using for now; |
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*/ |
29 |
char smClean_notify = TRUE; |
30 |
#else |
31 |
static int smClean_notify = TRUE; |
32 |
#endif |
33 |
|
34 |
typedef struct { |
35 |
float dist; /* average distance */ |
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BYTE rgb[3]; /* average color */ |
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} QTRAVG; /* average quadtree value */ |
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|
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typedef struct { |
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QUADTREE qt; /* quadtree node (key & hash value) */ |
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QTRAVG av; /* node average */ |
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} QT_LUENT; /* lookup table entry */ |
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|
44 |
static QT_LUENT *qt_htbl = NULL; /* quadtree hash table */ |
45 |
static int qt_hsiz = 0; /* quadtree hash table size */ |
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|
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|
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int |
49 |
mark_active_tris(qtptr,arg) |
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QUADTREE *qtptr; |
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char *arg; |
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{ |
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QUADTREE qt = *qtptr; |
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OBJECT os[QT_MAX_SET+1],*optr; |
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register int i,t_id; |
56 |
|
57 |
if (!QT_IS_LEAF(qt)) |
58 |
return(TRUE); |
59 |
/* For each triangle in the set, set the which flag*/ |
60 |
qtgetset(os,qt); |
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|
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for (i = QT_SET_CNT(os), optr = QT_SET_PTR(os); i > 0; i--) |
63 |
{ |
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t_id = QT_SET_NEXT_ELEM(optr); |
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/* Set the render flag */ |
66 |
if(SM_IS_NTH_T_BASE(smMesh,t_id)) |
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continue; |
68 |
SM_SET_NTH_T_ACTIVE(smMesh,t_id); |
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/* FOR NOW:Also set the LRU clock bit: MAY WANT TO CHANGE: */ |
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SM_SET_NTH_T_LRU(smMesh,t_id); |
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} |
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return(TRUE); |
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} |
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|
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mark_tris_in_frustum(view) |
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VIEW *view; |
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{ |
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FVECT nr[4],far[4]; |
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|
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/* Mark triangles in approx. view frustum as being active:set |
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LRU counter: for use in discarding samples when out |
82 |
of space |
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Radiance often has no far clipping plane: but driver will set |
84 |
dev_zmin,dev_zmax to satisfy OGL |
85 |
*/ |
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|
87 |
/* First clear all the quadtree node and triangle active flags */ |
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qtClearAllFlags(); |
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smClear_flags(smMesh,T_ACTIVE_FLAG); |
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|
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/* calculate the world space coordinates of the view frustum */ |
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calculate_view_frustum(view->vp,view->hvec,view->vvec,view->horiz, |
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view->vert, dev_zmin,dev_zmax,nr,far); |
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|
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/* Project the view frustum onto the spherical quadtree */ |
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/* For every cell intersected by the projection of the faces |
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of the frustum: mark all triangles in the cell as ACTIVE- |
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Also set the triangles LRU clock counter |
99 |
*/ |
100 |
/* Near face triangles */ |
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smLocator_apply_func(smMesh,nr[0],nr[2],nr[3],mark_active_tris,NULL); |
102 |
smLocator_apply_func(smMesh,nr[2],nr[0],nr[1],mark_active_tris,NULL); |
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/* Right face triangles */ |
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smLocator_apply_func(smMesh,nr[0],far[3],far[0],mark_active_tris,NULL); |
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smLocator_apply_func(smMesh,far[3],nr[0],nr[3],mark_active_tris,NULL); |
106 |
/* Left face triangles */ |
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smLocator_apply_func(smMesh,nr[1],far[2],nr[2],mark_active_tris,NULL); |
108 |
smLocator_apply_func(smMesh,far[2],nr[1],far[1],mark_active_tris,NULL); |
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/* Top face triangles */ |
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smLocator_apply_func(smMesh,nr[0],far[0],nr[1],mark_active_tris,NULL); |
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smLocator_apply_func(smMesh,nr[1],far[0],far[1],mark_active_tris,NULL); |
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/* Bottom face triangles */ |
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smLocator_apply_func(smMesh,nr[3],nr[2],far[3],mark_active_tris,NULL); |
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smLocator_apply_func(smMesh,nr[2],far[2],far[3],mark_active_tris,NULL); |
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/* Far face triangles */ |
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smLocator_apply_func(smMesh,far[0],far[2],far[1],mark_active_tris,NULL); |
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smLocator_apply_func(smMesh,far[2],far[0],far[3],mark_active_tris,NULL); |
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|
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#ifdef TEST_DRIVER |
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VCOPY(FrustumFar[0],far[0]); |
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VCOPY(FrustumFar[1],far[1]); |
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VCOPY(FrustumFar[2],far[2]); |
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VCOPY(FrustumFar[3],far[3]); |
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VCOPY(FrustumNear[0],nr[0]); |
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VCOPY(FrustumNear[1],nr[1]); |
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VCOPY(FrustumNear[2],nr[2]); |
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VCOPY(FrustumNear[3],nr[3]); |
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#endif |
129 |
} |
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|
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/* |
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* smClean() : display has been wiped clean |
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* |
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* Called after display has been effectively cleared, meaning that all |
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* geometry must be resent down the pipeline in the next call to smUpdate(). |
136 |
*/ |
137 |
smClean() |
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{ |
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smClean_notify = TRUE; |
140 |
} |
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|
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int |
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qtHash_init(nel) /* initialize for at least nel elements */ |
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int nel; |
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{ |
146 |
static int hsiztab[] = { |
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8191, 16381, 32749, 65521, 131071, 262139, 524287, 1048573, 0 |
148 |
}; |
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register int i; |
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|
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if (nel <= 0) { /* call to free table */ |
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if (qt_hsiz) { |
153 |
free((char *)qt_htbl); |
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qt_htbl = NULL; |
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qt_hsiz = 0; |
156 |
} |
157 |
return(0); |
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} |
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nel += nel>>1; /* 66% occupancy */ |
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for (i = 0; hsiztab[i]; i++) |
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if (hsiztab[i] > nel) |
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break; |
163 |
if (!(qt_hsiz = hsiztab[i])) |
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qt_hsiz = nel*2 + 1; /* not always prime */ |
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qt_htbl = (QT_LUENT *)calloc(qt_hsiz, sizeof(QT_LUENT)); |
166 |
if (qt_htbl == NULL) |
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qt_hsiz = 0; |
168 |
for (i = qt_hsiz; i--; ) |
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qt_htbl[i].qt = EMPTY; |
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return(qt_hsiz); |
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} |
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|
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QT_LUENT * |
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qtHash_find(qt) /* find a quadtree table entry */ |
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QUADTREE qt; |
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{ |
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int i, n; |
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register int ndx; |
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register QT_LUENT *le; |
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|
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if (qt_hsiz == 0) |
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qtHash_init(1); |
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tryagain: /* hash table lookup */ |
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ndx = (unsigned long)qt % qt_hsiz; |
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for (i = 0, n = 1; i < qt_hsiz; i++, n += 2) { |
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le = &qt_htbl[ndx]; |
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if (QT_IS_EMPTY(le->qt) || le->qt == qt) |
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return(le); |
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if ((ndx += n) >= qt_hsiz) /* this happens rarely */ |
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ndx = ndx % qt_hsiz; |
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} |
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/* table is full, reallocate */ |
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le = qt_htbl; |
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ndx = qt_hsiz; |
195 |
if (!qtHash_init(ndx+1)) { /* no more memory! */ |
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qt_htbl = le; |
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qt_hsiz = ndx; |
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return(NULL); |
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} |
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if (!ndx) |
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goto tryagain; |
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/* copy old table to new */ |
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while (ndx--) |
204 |
if (!QT_IS_EMPTY(le[ndx].qt)) |
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copystruct(qtHash_find(le[ndx].qt), &le[ndx]); |
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free((char *)le); |
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goto tryagain; /* should happen only once! */ |
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} |
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|
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stCount_level_leaves(lcnt, qt) /* count quadtree leaf nodes at each level */ |
211 |
int lcnt[]; |
212 |
register QUADTREE qt; |
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{ |
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if (QT_IS_EMPTY(qt)) |
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return; |
216 |
if (QT_IS_TREE(qt)) { |
217 |
if (!QT_IS_FLAG(qt)) /* not in our frustum */ |
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return; |
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stCount_level_leaves(lcnt+1, QT_NTH_CHILD(qt,0)); |
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stCount_level_leaves(lcnt+1, QT_NTH_CHILD(qt,1)); |
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stCount_level_leaves(lcnt+1, QT_NTH_CHILD(qt,2)); |
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stCount_level_leaves(lcnt+1, QT_NTH_CHILD(qt,3)); |
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} |
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else |
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lcnt[0]++; |
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} |
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|
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|
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QTRAVG * |
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qtRender_level(qt,v0,v1,v2,sm,lvl) |
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QUADTREE qt; |
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FVECT v0,v1,v2; |
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SM *sm; |
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int lvl; |
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{ |
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FVECT a,b,c; |
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register QT_LUENT *le; |
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QTRAVG *rc[4]; |
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|
240 |
if (QT_IS_EMPTY(qt)) /* empty leaf node */ |
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return(NULL); |
242 |
if (QT_IS_TREE(qt) && !QT_IS_FLAG(qt)) /* not in our frustum */ |
243 |
return(NULL); |
244 |
/* else look up node */ |
245 |
if ((le = qtHash_find(qt)) == NULL) |
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error(SYSTEM, "out of memory in qtRender_level"); |
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if (QT_IS_TREE(qt) && (QT_IS_EMPTY(le->qt) || lvl > 0)) |
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{ /* compute children */ |
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qtSubdivide_tri(v0,v1,v2,a,b,c); |
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rc[0] = qtRender_level(QT_NTH_CHILD(qt,0),v0,a,c,sm,lvl-1); |
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rc[1] = qtRender_level(QT_NTH_CHILD(qt,1),a,v1,b,sm,lvl-1); |
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rc[2] = qtRender_level(QT_NTH_CHILD(qt,2),c,b,v2,sm,lvl-1); |
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rc[3] = qtRender_level(QT_NTH_CHILD(qt,3),b,c,a,sm,lvl-1); |
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} |
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if (QT_IS_EMPTY(le->qt)) |
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{ /* let's make some data! */ |
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int rgbs[3]; |
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double distsum; |
259 |
register int i, n; |
260 |
/* average our triangle vertices */ |
261 |
rgbs[0] = rgbs[1] = rgbs[2] = 0; |
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distsum = 0.; n = 0; |
263 |
if(QT_IS_TREE(qt)) |
264 |
{ /* from subtree */ |
265 |
for (i = 4; i--; ) |
266 |
if (rc[i] != NULL) |
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{ |
268 |
rgbs[0] += rc[i]->rgb[0]; rgbs[1] += rc[i]->rgb[1]; |
269 |
rgbs[2] += rc[i]->rgb[2]; distsum += rc[i]->dist; n++; |
270 |
} |
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} |
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else |
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{ /* from triangle set */ |
274 |
OBJECT os[QT_MAX_SET+1]; |
275 |
int s0, s1, s2; |
276 |
|
277 |
qtgetset(os,qt); |
278 |
for (n = os[0]; n; n--) |
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{ |
280 |
qtTri_from_id(os[n],a,b,c,NULL,NULL,NULL,&s0,&s1,&s2); |
281 |
distsum += SM_BG_SAMPLE(sm,s0) ? dev_zmax |
282 |
: sqrt(dist2(a,SM_VIEW_CENTER(sm))); |
283 |
distsum += SM_BG_SAMPLE(sm,s1) ? dev_zmax |
284 |
: sqrt(dist2(b,SM_VIEW_CENTER(sm))); |
285 |
distsum += SM_BG_SAMPLE(sm,s2) ? dev_zmax |
286 |
: sqrt(dist2(c,SM_VIEW_CENTER(sm))); |
287 |
rgbs[0] += SM_NTH_RGB(sm,s0)[0] + SM_NTH_RGB(sm,s1)[0] |
288 |
+ SM_NTH_RGB(sm,s2)[0]; |
289 |
rgbs[1] += SM_NTH_RGB(sm,s0)[1] + SM_NTH_RGB(sm,s1)[1] |
290 |
+ SM_NTH_RGB(sm,s2)[1]; |
291 |
rgbs[2] += SM_NTH_RGB(sm,s0)[2] + SM_NTH_RGB(sm,s1)[2] |
292 |
+ SM_NTH_RGB(sm,s2)[2]; |
293 |
} |
294 |
n = 3*os[0]; |
295 |
} |
296 |
if (!n) |
297 |
return(NULL); |
298 |
le->qt = qt; |
299 |
le->av.rgb[0] = rgbs[0]/n; le->av.rgb[1] = rgbs[1]/n; |
300 |
le->av.rgb[2] = rgbs[2]/n; le->av.dist = distsum/(double)n; |
301 |
} |
302 |
if (lvl == 0 || (lvl > 0 && QT_IS_LEAF(qt))) |
303 |
{ /* render this node */ |
304 |
/* compute pseudo vertices */ |
305 |
VCOPY(a,v0); VCOPY(b,v1); VCOPY(c,v2); |
306 |
normalize(a); normalize(b); normalize(c); |
307 |
VSUM(a,SM_VIEW_CENTER(sm),a,le->av.dist); |
308 |
VSUM(b,SM_VIEW_CENTER(sm),b,le->av.dist); |
309 |
VSUM(c,SM_VIEW_CENTER(sm),c,le->av.dist); |
310 |
/* draw triangle */ |
311 |
glColor3ub(le->av.rgb[0],le->av.rgb[1],le->av.rgb[2]); |
312 |
/* NOTE: Triangle vertex order may change */ |
313 |
glVertex3d(c[0],c[1],c[2]); |
314 |
glVertex3d(b[0],b[1],b[2]); |
315 |
glVertex3d(a[0],a[1],a[2]); |
316 |
} |
317 |
return(&le->av); |
318 |
} |
319 |
|
320 |
|
321 |
smRender_stree_level(sm,lvl) |
322 |
SM *sm; |
323 |
int lvl; |
324 |
{ |
325 |
QUADTREE root; |
326 |
int i; |
327 |
FVECT t0,t1,t2; |
328 |
|
329 |
if (lvl < 1) |
330 |
return; |
331 |
glPushAttrib(GL_LIGHTING_BIT); |
332 |
glShadeModel(GL_FLAT); |
333 |
glBegin(GL_TRIANGLES); |
334 |
for(i=0; i < 4; i++) |
335 |
{ |
336 |
root = ST_NTH_ROOT(SM_LOCATOR(sm),i); |
337 |
stNth_base_verts(SM_LOCATOR(sm),i,t0,t1,t2); |
338 |
qtRender_level(root,t0,t1,t2,sm,lvl-1); |
339 |
} |
340 |
glEnd(); |
341 |
glPopAttrib(); |
342 |
} |
343 |
|
344 |
|
345 |
smRender_stree(sm, qual) /* render some quadtree triangles */ |
346 |
SM *sm; |
347 |
int qual; |
348 |
{ |
349 |
int i, ntarget; |
350 |
int lvlcnt[QT_MAX_LEVELS]; |
351 |
|
352 |
if (qual <= 0) |
353 |
return; |
354 |
/* compute rendering target */ |
355 |
ntarget = 0; |
356 |
SM_FOR_ALL_ACTIVE_TRIS(sm,i) |
357 |
ntarget++; |
358 |
ntarget = ntarget*qual/100; |
359 |
if (!ntarget) |
360 |
return; |
361 |
for (i = QT_MAX_LEVELS; i--; ) |
362 |
lvlcnt[i] = 0; |
363 |
stCount_level_leaves(lvlcnt, SM_LOCATOR(sm)->root); |
364 |
for (ntarget -= lvlcnt[i=0]; i < QT_MAX_LEVELS-1; ntarget -= lvlcnt[++i]) |
365 |
if (ntarget < lvlcnt[i+1]) |
366 |
break; |
367 |
/* compute and render target level */ |
368 |
smRender_stree_level(sm,i); |
369 |
} |
370 |
|
371 |
|
372 |
smRender_tri(sm,i,vp,clr) |
373 |
SM *sm; |
374 |
int i; |
375 |
FVECT vp; |
376 |
int clr; |
377 |
{ |
378 |
TRI *tri; |
379 |
double ptr[3]; |
380 |
int j; |
381 |
|
382 |
tri = SM_NTH_TRI(sm,i); |
383 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
384 |
|
385 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
386 |
tris: could change |
387 |
*/ |
388 |
for(j=2; j>= 0; j--) |
389 |
{ |
390 |
#ifdef DEBUG |
391 |
if(SM_BG_SAMPLE(sm,T_NTH_V(tri,j))) |
392 |
eputs("SmRenderTri(): shouldnt have bg samples\n"); |
393 |
#endif |
394 |
glColor3ub(SM_NTH_RGB(sm,T_NTH_V(tri,j))[0], |
395 |
SM_NTH_RGB(sm,T_NTH_V(tri,j))[1], |
396 |
SM_NTH_RGB(sm,T_NTH_V(tri,j))[2]); |
397 |
VCOPY(ptr,SM_T_NTH_WV(sm,tri,j)); |
398 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
399 |
} |
400 |
} |
401 |
|
402 |
smRender_mixed_tri(sm,i,vp,clr) |
403 |
SM *sm; |
404 |
int i; |
405 |
FVECT vp; |
406 |
int clr; |
407 |
{ |
408 |
TRI *tri; |
409 |
double p[3],d; |
410 |
int j,ids[3],cnt; |
411 |
int rgb[3]; |
412 |
|
413 |
tri = SM_NTH_TRI(sm,i); |
414 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
415 |
|
416 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
417 |
tris: could change |
418 |
*/ |
419 |
cnt = 0; |
420 |
d = 0.0; |
421 |
rgb[0] = rgb[1] = rgb[2] = 0; |
422 |
for(j=0;j < 3;j++) |
423 |
{ |
424 |
ids[j] = T_NTH_V(tri,j); |
425 |
if(!SM_BG_SAMPLE(sm,ids[j])) |
426 |
{ |
427 |
rgb[0] += SM_NTH_RGB(sm,ids[j])[0]; |
428 |
rgb[1] += SM_NTH_RGB(sm,ids[j])[1]; |
429 |
rgb[2] += SM_NTH_RGB(sm,ids[j])[2]; |
430 |
cnt++; |
431 |
d += DIST(vp,SM_NTH_WV(sm,ids[j])); |
432 |
} |
433 |
} |
434 |
if(cnt > 1) |
435 |
{ |
436 |
rgb[0]/=cnt; rgb[1]/=cnt; rgb[2]/=cnt; |
437 |
d /= (double)cnt; |
438 |
} |
439 |
for(j=2; j>= 0; j--) |
440 |
{ |
441 |
if(SM_BG_SAMPLE(sm,ids[j])) |
442 |
{ |
443 |
glColor3ub(rgb[0],rgb[1],rgb[2]); |
444 |
VSUB(p,SM_NTH_WV(sm,ids[j]),SM_VIEW_CENTER(sm)); |
445 |
p[0] *= d; |
446 |
p[1] *= d; |
447 |
p[2] *= d; |
448 |
VADD(p,p,SM_VIEW_CENTER(sm)); |
449 |
} |
450 |
else |
451 |
{ |
452 |
glColor3ub(SM_NTH_RGB(sm,ids[j])[0],SM_NTH_RGB(sm,ids[j])[1], |
453 |
SM_NTH_RGB(sm,ids[j])[2]); |
454 |
VCOPY(p,SM_NTH_WV(sm,ids[j])); |
455 |
} |
456 |
glVertex3d(p[0],p[1],p[2]); |
457 |
} |
458 |
} |
459 |
|
460 |
smRender_bg_tri(sm,i,vp,d,clr) |
461 |
SM *sm; |
462 |
int i; |
463 |
FVECT vp; |
464 |
double d; |
465 |
int clr; |
466 |
{ |
467 |
double p[3]; |
468 |
int j,id; |
469 |
TRI *tri; |
470 |
|
471 |
tri = SM_NTH_TRI(sm,i); |
472 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
473 |
|
474 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
475 |
tris: could change |
476 |
*/ |
477 |
for(j=2; j>= 0; j--) |
478 |
{ |
479 |
id = T_NTH_V(tri,j); |
480 |
glColor3ub(SM_NTH_RGB(sm,id)[0],SM_NTH_RGB(sm,id)[1], |
481 |
SM_NTH_RGB(sm,id)[2]); |
482 |
VSUB(p,SM_NTH_WV(sm,id),SM_VIEW_CENTER(sm)); |
483 |
if(dev_zmin >= 0.99) |
484 |
{ |
485 |
p[0] *= d; |
486 |
p[1] *= d; |
487 |
p[2] *= d; |
488 |
} |
489 |
VADD(p,p,vp); |
490 |
glVertex3d(p[0],p[1],p[2]); |
491 |
} |
492 |
} |
493 |
|
494 |
smRender_mesh(sm,vp,clr) |
495 |
SM *sm; |
496 |
FVECT vp; |
497 |
int clr; |
498 |
{ |
499 |
int i; |
500 |
TRI *tri; |
501 |
double ptr[3],d; |
502 |
int j; |
503 |
|
504 |
d = (dev_zmin+dev_zmax)/2.0; |
505 |
glPushAttrib(GL_DEPTH_BUFFER_BIT); |
506 |
|
507 |
/* First draw background polygons */ |
508 |
|
509 |
glDisable(GL_DEPTH_TEST); |
510 |
glBegin(GL_TRIANGLES); |
511 |
SM_FOR_ALL_ACTIVE_BG_TRIS(sm,i) |
512 |
smRender_bg_tri(sm,i,vp,d,clr); |
513 |
glEnd(); |
514 |
|
515 |
glEnable(GL_DEPTH_TEST); |
516 |
glBegin(GL_TRIANGLES); |
517 |
SM_FOR_ALL_ACTIVE_FG_TRIS(sm,i) |
518 |
{ |
519 |
if(!SM_MIXED_TRI(sm,i)) |
520 |
smRender_tri(sm,i,vp,clr); |
521 |
else |
522 |
smRender_mixed_tri(sm,i,vp,clr); |
523 |
} |
524 |
glEnd(); |
525 |
|
526 |
glPopAttrib(); |
527 |
} |
528 |
|
529 |
smRender_tri_edges(sm,i) |
530 |
SM *sm; |
531 |
int i; |
532 |
{ |
533 |
TRI *tri; |
534 |
int j; |
535 |
double ptr[3]; |
536 |
|
537 |
|
538 |
tri = SM_NTH_TRI(sm,i); |
539 |
|
540 |
/* Triangles are defined clockwise:historical relative to spherical |
541 |
tris: could change |
542 |
*/ |
543 |
for(j=2; j >=0; j--) |
544 |
{ |
545 |
VCOPY(ptr,SM_NTH_WV(sm,T_NTH_V(tri,j))); |
546 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
547 |
VCOPY(ptr,SM_NTH_WV(sm,T_NTH_V(tri,(j+1)%3))); |
548 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
549 |
} |
550 |
} |
551 |
|
552 |
int |
553 |
compare_tri_depths(T_DEPTH *td1,T_DEPTH *td2) |
554 |
{ |
555 |
double d; |
556 |
|
557 |
d = td2->depth-td1->depth; |
558 |
|
559 |
if(d > 0.0) |
560 |
return(1); |
561 |
if(d < 0.0) |
562 |
return(-1); |
563 |
|
564 |
return(0); |
565 |
} |
566 |
|
567 |
LIST |
568 |
*smDepth_sort_tris(sm,vp,td) |
569 |
SM *sm; |
570 |
FVECT vp; |
571 |
T_DEPTH *td; |
572 |
{ |
573 |
int i,j,t_id,v; |
574 |
TRI *tri; |
575 |
double d,min_d; |
576 |
LIST *tlist=NULL; |
577 |
|
578 |
i = 0; |
579 |
SM_FOR_ALL_NEW_TRIS(sm,t_id) |
580 |
{ |
581 |
if(SM_BG_TRI(sm,t_id)) |
582 |
{ |
583 |
tlist = push_data(tlist,t_id); |
584 |
continue; |
585 |
} |
586 |
tri = SM_NTH_TRI(sm,t_id); |
587 |
td[i].tri = t_id; |
588 |
min_d = -1; |
589 |
for(j=0;j < 3;j++) |
590 |
{ |
591 |
v = T_NTH_V(tri,j); |
592 |
if(!SM_BG_SAMPLE(sm,v)) |
593 |
{ |
594 |
d = DIST(vp,SM_NTH_WV(sm,v)); |
595 |
if(min_d == -1 || d < min_d) |
596 |
min_d = d; |
597 |
} |
598 |
} |
599 |
td[i].depth = min_d; |
600 |
i++; |
601 |
} |
602 |
td[i].tri = -1; |
603 |
if(i) |
604 |
qsort((void *)td,i,sizeof(T_DEPTH),compare_tri_depths); |
605 |
return(tlist); |
606 |
} |
607 |
|
608 |
|
609 |
smUpdate_Rendered_mesh(sm,vp,clr) |
610 |
SM *sm; |
611 |
FVECT vp; |
612 |
int clr; |
613 |
{ |
614 |
static T_DEPTH *td= NULL; |
615 |
static int tsize = 0; |
616 |
int i; |
617 |
GLint depth_test; |
618 |
double d; |
619 |
LIST *bglist; |
620 |
/* For all of the NEW triangles (since last update): assume |
621 |
ACTIVE. Go through and sort on depth value (from vp). Turn |
622 |
Depth Buffer test off and render back-front |
623 |
*/ |
624 |
/* NOTE: could malloc each time or hard code */ |
625 |
if(smNew_tri_cnt > tsize) |
626 |
{ |
627 |
if(td) |
628 |
free((char *)td); |
629 |
td = (T_DEPTH *)malloc(smNew_tri_cnt*sizeof(T_DEPTH)); |
630 |
tsize = smNew_tri_cnt; |
631 |
} |
632 |
if(!td) |
633 |
{ |
634 |
error(SYSTEM,"smUpdate_Rendered_mesh:Cannot allocate memory\n"); |
635 |
} |
636 |
bglist = smDepth_sort_tris(sm,vp,td); |
637 |
|
638 |
/* Turn Depth Test off -- using Painter's algorithm */ |
639 |
glPushAttrib(GL_DEPTH_BUFFER_BIT); |
640 |
glDisable(GL_DEPTH_TEST); |
641 |
d = (dev_zmin+dev_zmax)/2.0; |
642 |
/* Now render back-to front */ |
643 |
/* First render bg triangles */ |
644 |
glBegin(GL_TRIANGLES); |
645 |
while(bglist) |
646 |
smRender_bg_tri(sm,pop_list(&bglist),vp,d,clr); |
647 |
glEnd(); |
648 |
|
649 |
glEnable(GL_DEPTH_TEST); |
650 |
glBegin(GL_TRIANGLES); |
651 |
i=0; |
652 |
while(td[i].tri != -1) |
653 |
if(!SM_MIXED_TRI(sm,td[i].tri)) |
654 |
smRender_tri(sm,td[i++].tri,vp,clr); |
655 |
else |
656 |
smRender_mixed_tri(sm,td[i++].tri,vp,clr); |
657 |
glEnd(); |
658 |
|
659 |
/* Restore Depth Test */ |
660 |
glPopAttrib(); |
661 |
} |
662 |
|
663 |
/* |
664 |
* smUpdate(view, qua) : update OpenGL output geometry for view vp |
665 |
* VIEW *view; : desired view |
666 |
* int qual; : quality level (percentage on linear time scale) |
667 |
* |
668 |
* Draw new geometric representation using OpenGL calls. Assume that the |
669 |
* view has already been set up and the correct frame buffer has been |
670 |
* selected for drawing. The quality level is on a linear scale, where 100% |
671 |
* is full (final) quality. It is not necessary to redraw geometry that has |
672 |
* been output since the last call to smClean(). (The last view drawn will |
673 |
* be view==&odev.v each time.) |
674 |
*/ |
675 |
smUpdate(view,qual) |
676 |
VIEW *view; |
677 |
int qual; |
678 |
{ |
679 |
double d; |
680 |
int last_update; |
681 |
int t; |
682 |
|
683 |
/* If view has moved beyond epsilon from canonical: must rebuild - |
684 |
epsilon is calculated as running avg of distance of sample points |
685 |
from canonical view: m = 1/(AVG(1/r)): some fraction of this |
686 |
*/ |
687 |
d = DIST(view->vp,SM_VIEW_CENTER(smMesh)); |
688 |
if(qual >= 100 && d > SM_ALLOWED_VIEW_CHANGE(smMesh)) |
689 |
{ |
690 |
/* Re-build the mesh */ |
691 |
#ifdef TEST_DRIVER |
692 |
odev.v = *view; |
693 |
#endif |
694 |
smRebuild_mesh(smMesh,view->vp); |
695 |
} |
696 |
/* This is our final update iff qual==100 and view==&odev.v */ |
697 |
last_update = qual>=100 && view==&(odev.v); |
698 |
/* Check if we should draw ALL triangles in current frustum */ |
699 |
if(smClean_notify || smNew_tri_cnt > SM_NUM_TRIS(smMesh)*SM_INC_PERCENT) |
700 |
{ |
701 |
#ifdef TEST_DRIVER |
702 |
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
703 |
#else |
704 |
if (SM_TONE_MAP(smMesh) < SM_NUM_SAMP(smMesh)) |
705 |
{ |
706 |
tmClearHisto(); |
707 |
tmAddHisto(SM_BRT(smMesh),SM_NUM_SAMP(smMesh),1); |
708 |
if(tmComputeMapping(0.,0.,0.) != TM_E_OK || |
709 |
tmMapPixels(SM_RGB(smMesh),SM_BRT(smMesh),SM_CHR(smMesh), |
710 |
SM_NUM_SAMP(smMesh)) != TM_E_OK) |
711 |
return; |
712 |
} |
713 |
#endif |
714 |
mark_tris_in_frustum(view); |
715 |
if (qual <= 75) |
716 |
smRender_stree(smMesh,qual); |
717 |
else |
718 |
smRender_mesh(smMesh,view->vp,last_update); |
719 |
#ifdef TEST_DRIVER |
720 |
glFlush(); |
721 |
glutSwapBuffers(); |
722 |
#endif |
723 |
} |
724 |
/* Do an incremental update instead */ |
725 |
else |
726 |
{ |
727 |
if(!smNew_tri_cnt) |
728 |
return; |
729 |
#ifdef TEST_DRIVER |
730 |
glDrawBuffer(GL_FRONT); |
731 |
#else |
732 |
t = SM_TONE_MAP(smMesh); |
733 |
if(t == 0) |
734 |
{ |
735 |
tmClearHisto(); |
736 |
tmAddHisto(SM_BRT(smMesh),SM_NUM_SAMP(smMesh),1); |
737 |
if(tmComputeMapping(0.,0.,0.) != TM_E_OK) |
738 |
return; |
739 |
} |
740 |
if(tmMapPixels(SM_NTH_RGB(smMesh,t),&SM_NTH_BRT(smMesh,t), |
741 |
SM_NTH_CHR(smMesh,t), SM_NUM_SAMP(smMesh)-t) != TM_E_OK) |
742 |
return; |
743 |
#endif |
744 |
smUpdate_Rendered_mesh(smMesh,view->vp,last_update); |
745 |
|
746 |
#ifdef TEST_DRIVER |
747 |
glDrawBuffer(GL_BACK); |
748 |
#endif |
749 |
} |
750 |
SM_TONE_MAP(smMesh) = SM_NUM_SAMP(smMesh); |
751 |
if (last_update) |
752 |
{ |
753 |
smClean_notify = FALSE; |
754 |
smNew_tri_cnt = 0; |
755 |
qtHash_init(0); |
756 |
} |
757 |
|
758 |
} |