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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
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#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
| 6 |
|
| 7 |
/* |
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* sm_ogl.c |
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*/ |
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#include "standard.h" |
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|
| 12 |
#include <GL/gl.h> |
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|
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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 "sm_list.h" |
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#include "sm_geom.h" |
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#include "sm.h" |
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|
| 23 |
#ifdef TEST_DRIVER |
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#include "sm_draw.h" |
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/*static char smClean_notify = TRUE; |
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MAKE STATIC LATER: ui.c using for now; |
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*/ |
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char smClean_notify = TRUE; |
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#else |
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static int smClean_notify = TRUE; |
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#endif |
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|
| 33 |
typedef struct { |
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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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|
| 43 |
static QT_LUENT *qt_htbl = NULL; /* quadtree cache */ |
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static int qt_hsiz = 0; /* quadtree cache size */ |
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|
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|
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int |
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mark_active_tris(qtptr,arg) |
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QUADTREE *qtptr; |
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int *arg; |
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{ |
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QUADTREE qt = *qtptr; |
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OBJECT *os,*optr; |
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register int i,t_id; |
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|
| 56 |
if (!QT_IS_LEAF(qt)) |
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return(TRUE); |
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/* For each triangle in the set, set the which flag*/ |
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os = qtqueryset(qt); |
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|
| 61 |
for (i = QT_SET_CNT(os), optr = QT_SET_PTR(os); i > 0; i--) |
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{ |
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t_id = QT_SET_NEXT_ELEM(optr); |
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/* Set the render flag */ |
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if(SM_IS_NTH_T_BASE(smMesh,t_id)) |
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continue; |
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SM_SET_NTH_T_ACTIVE(smMesh,t_id); |
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/* NOTE: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 |
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of space |
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Radiance often has no far clipping plane: but driver will set |
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dev_zmin,dev_zmax to satisfy OGL |
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*/ |
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|
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/* 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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|
| 90 |
/* 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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|
| 94 |
/* Project the view frustum onto the spherical quadtree */ |
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/* For every cell intersected by the projection of the faces |
| 96 |
of the frustum: mark all triangles in the cell as ACTIVE- |
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Also set the triangles LRU clock counter |
| 98 |
*/ |
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/* Near face triangles */ |
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smLocator_apply_func(smMesh,nr[0],nr[2],nr[3],mark_active_tris,NULL); |
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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); |
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/* Left face triangles */ |
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smLocator_apply_func(smMesh,nr[1],far[2],nr[2],mark_active_tris,NULL); |
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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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|
| 118 |
#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]); |
| 123 |
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 |
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} |
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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(). |
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*/ |
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smClean() |
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{ |
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smClean_notify = TRUE; |
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} |
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|
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int |
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qtCache_init(nel) /* initialize for at least nel elements */ |
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int nel; |
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{ |
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static int hsiztab[] = { |
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8191, 16381, 32749, 65521, 131071, 262139, 524287, 1048573, 0 |
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}; |
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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) { |
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free((char *)qt_htbl); |
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qt_htbl = NULL; |
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qt_hsiz = 0; |
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} |
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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; |
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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)); |
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if (qt_htbl == NULL) |
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qt_hsiz = 0; |
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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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qtCache_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 && !qtCache_init(1)) |
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return(NULL); |
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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; |
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if (!qtCache_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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/* copy old table to new and free */ |
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while (ndx--) |
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if (!QT_IS_EMPTY(le[ndx].qt)) |
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copystruct(qtCache_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 */ |
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int lcnt[]; |
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register QUADTREE qt; |
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{ |
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if (QT_IS_EMPTY(qt)) |
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return; |
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if (QT_IS_TREE(qt)) { |
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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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|
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if (QT_IS_EMPTY(qt)) /* empty leaf node */ |
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return(NULL); |
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if (QT_IS_TREE(qt) && !QT_IS_FLAG(qt)) /* not in our frustum */ |
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return(NULL); |
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/* else look up node */ |
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if ((le = qtCache_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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} |
| 252 |
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; |
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register int i, n; |
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/* average our triangle vertices */ |
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rgbs[0] = rgbs[1] = rgbs[2] = 0; |
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distsum = 0.; n = 0; |
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if(QT_IS_TREE(qt)) |
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{ /* from subtree */ |
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for (i = 4; i--; ) |
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if (rc[i] != NULL) |
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{ |
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rgbs[0] += rc[i]->rgb[0]; rgbs[1] += rc[i]->rgb[1]; |
| 266 |
rgbs[2] += rc[i]->rgb[2]; distsum += rc[i]->dist; n++; |
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} |
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} |
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else |
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{ /* from triangle set */ |
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OBJECT *os; |
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int s0, s1, s2; |
| 273 |
|
| 274 |
os = qtqueryset(qt); |
| 275 |
for (n = os[0]; n; n--) |
| 276 |
{ |
| 277 |
qtTri_from_id(os[n],a,b,c,NULL,NULL,NULL,&s0,&s1,&s2); |
| 278 |
distsum += SM_BG_SAMPLE(sm,s0) ? dev_zmax |
| 279 |
: sqrt(dist2(a,SM_VIEW_CENTER(sm))); |
| 280 |
distsum += SM_BG_SAMPLE(sm,s1) ? dev_zmax |
| 281 |
: sqrt(dist2(b,SM_VIEW_CENTER(sm))); |
| 282 |
distsum += SM_BG_SAMPLE(sm,s2) ? dev_zmax |
| 283 |
: sqrt(dist2(c,SM_VIEW_CENTER(sm))); |
| 284 |
rgbs[0] += SM_NTH_RGB(sm,s0)[0] + SM_NTH_RGB(sm,s1)[0] |
| 285 |
+ SM_NTH_RGB(sm,s2)[0]; |
| 286 |
rgbs[1] += SM_NTH_RGB(sm,s0)[1] + SM_NTH_RGB(sm,s1)[1] |
| 287 |
+ SM_NTH_RGB(sm,s2)[1]; |
| 288 |
rgbs[2] += SM_NTH_RGB(sm,s0)[2] + SM_NTH_RGB(sm,s1)[2] |
| 289 |
+ SM_NTH_RGB(sm,s2)[2]; |
| 290 |
} |
| 291 |
n = 3*os[0]; |
| 292 |
} |
| 293 |
if (!n) |
| 294 |
return(NULL); |
| 295 |
le->qt = qt; |
| 296 |
le->av.rgb[0] = rgbs[0]/n; le->av.rgb[1] = rgbs[1]/n; |
| 297 |
le->av.rgb[2] = rgbs[2]/n; le->av.dist = distsum/(double)n; |
| 298 |
} |
| 299 |
if (lvl == 0 || (lvl > 0 && QT_IS_LEAF(qt))) |
| 300 |
{ /* render this node */ |
| 301 |
/* compute pseudo vertices */ |
| 302 |
VCOPY(a,v0); VCOPY(b,v1); VCOPY(c,v2); |
| 303 |
normalize(a); normalize(b); normalize(c); |
| 304 |
VSUM(a,SM_VIEW_CENTER(sm),a,le->av.dist); |
| 305 |
VSUM(b,SM_VIEW_CENTER(sm),b,le->av.dist); |
| 306 |
VSUM(c,SM_VIEW_CENTER(sm),c,le->av.dist); |
| 307 |
/* draw triangle */ |
| 308 |
glColor3ub(le->av.rgb[0],le->av.rgb[1],le->av.rgb[2]); |
| 309 |
/* NOTE: Triangle vertex order may change */ |
| 310 |
glVertex3d(c[0],c[1],c[2]); |
| 311 |
glVertex3d(b[0],b[1],b[2]); |
| 312 |
glVertex3d(a[0],a[1],a[2]); |
| 313 |
} |
| 314 |
return(&le->av); |
| 315 |
} |
| 316 |
|
| 317 |
|
| 318 |
smRender_stree_level(sm,lvl) |
| 319 |
SM *sm; |
| 320 |
int lvl; |
| 321 |
{ |
| 322 |
QUADTREE root; |
| 323 |
int i; |
| 324 |
FVECT t0,t1,t2; |
| 325 |
|
| 326 |
if (lvl < 1) |
| 327 |
return; |
| 328 |
glPushAttrib(GL_LIGHTING_BIT); |
| 329 |
glShadeModel(GL_FLAT); |
| 330 |
glBegin(GL_TRIANGLES); |
| 331 |
for(i=0; i < 4; i++) |
| 332 |
{ |
| 333 |
root = ST_NTH_ROOT(SM_LOCATOR(sm),i); |
| 334 |
stNth_base_verts(SM_LOCATOR(sm),i,t0,t1,t2); |
| 335 |
qtRender_level(root,t0,t1,t2,sm,lvl-1); |
| 336 |
} |
| 337 |
glEnd(); |
| 338 |
glPopAttrib(); |
| 339 |
} |
| 340 |
|
| 341 |
|
| 342 |
smRender_stree(sm, qual) /* render some quadtree triangles */ |
| 343 |
SM *sm; |
| 344 |
int qual; |
| 345 |
{ |
| 346 |
int i, ntarget; |
| 347 |
int lvlcnt[QT_MAX_LEVELS]; |
| 348 |
|
| 349 |
if (qual <= 0) |
| 350 |
return; |
| 351 |
/* compute rendering target */ |
| 352 |
ntarget = 0; |
| 353 |
SM_FOR_ALL_ACTIVE_TRIS(sm,i) |
| 354 |
ntarget++; |
| 355 |
ntarget = ntarget*qual/100; |
| 356 |
if (!ntarget) |
| 357 |
return; |
| 358 |
for (i = QT_MAX_LEVELS; i--; ) |
| 359 |
lvlcnt[i] = 0; |
| 360 |
stCount_level_leaves(lvlcnt, SM_LOCATOR(sm)->root); |
| 361 |
for (ntarget -= lvlcnt[i=0]; i < QT_MAX_LEVELS-1; ntarget -= lvlcnt[++i]) |
| 362 |
if (ntarget < lvlcnt[i+1]) |
| 363 |
break; |
| 364 |
/* compute and render target level */ |
| 365 |
smRender_stree_level(sm,i); |
| 366 |
} |
| 367 |
|
| 368 |
|
| 369 |
smRender_tri(sm,i,vp,clr) |
| 370 |
SM *sm; |
| 371 |
int i; |
| 372 |
FVECT vp; |
| 373 |
int clr; |
| 374 |
{ |
| 375 |
TRI *tri; |
| 376 |
double ptr[3]; |
| 377 |
int j; |
| 378 |
|
| 379 |
tri = SM_NTH_TRI(sm,i); |
| 380 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
| 381 |
|
| 382 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
| 383 |
tris: could change |
| 384 |
*/ |
| 385 |
for(j=2; j>= 0; j--) |
| 386 |
{ |
| 387 |
#ifdef DEBUG |
| 388 |
if(SM_BG_SAMPLE(sm,T_NTH_V(tri,j))) |
| 389 |
eputs("SmRenderTri(): shouldnt have bg samples\n"); |
| 390 |
#endif |
| 391 |
glColor3ub(SM_NTH_RGB(sm,T_NTH_V(tri,j))[0], |
| 392 |
SM_NTH_RGB(sm,T_NTH_V(tri,j))[1], |
| 393 |
SM_NTH_RGB(sm,T_NTH_V(tri,j))[2]); |
| 394 |
VCOPY(ptr,SM_T_NTH_WV(sm,tri,j)); |
| 395 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
| 396 |
} |
| 397 |
} |
| 398 |
|
| 399 |
smRender_mixed_tri(sm,i,vp,clr) |
| 400 |
SM *sm; |
| 401 |
int i; |
| 402 |
FVECT vp; |
| 403 |
int clr; |
| 404 |
{ |
| 405 |
TRI *tri; |
| 406 |
double p[3],d; |
| 407 |
int j,ids[3],cnt; |
| 408 |
int rgb[3]; |
| 409 |
|
| 410 |
tri = SM_NTH_TRI(sm,i); |
| 411 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
| 412 |
|
| 413 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
| 414 |
tris: could change |
| 415 |
*/ |
| 416 |
cnt = 0; |
| 417 |
d = 0.0; |
| 418 |
rgb[0] = rgb[1] = rgb[2] = 0; |
| 419 |
for(j=0;j < 3;j++) |
| 420 |
{ |
| 421 |
ids[j] = T_NTH_V(tri,j); |
| 422 |
if(!SM_BG_SAMPLE(sm,ids[j])) |
| 423 |
{ |
| 424 |
rgb[0] += SM_NTH_RGB(sm,ids[j])[0]; |
| 425 |
rgb[1] += SM_NTH_RGB(sm,ids[j])[1]; |
| 426 |
rgb[2] += SM_NTH_RGB(sm,ids[j])[2]; |
| 427 |
cnt++; |
| 428 |
d += DIST(vp,SM_NTH_WV(sm,ids[j])); |
| 429 |
} |
| 430 |
} |
| 431 |
if(cnt > 1) |
| 432 |
{ |
| 433 |
rgb[0]/=cnt; rgb[1]/=cnt; rgb[2]/=cnt; |
| 434 |
d /= (double)cnt; |
| 435 |
} |
| 436 |
for(j=2; j>= 0; j--) |
| 437 |
{ |
| 438 |
if(SM_BG_SAMPLE(sm,ids[j])) |
| 439 |
{ |
| 440 |
glColor3ub(rgb[0],rgb[1],rgb[2]); |
| 441 |
VSUB(p,SM_NTH_WV(sm,ids[j]),SM_VIEW_CENTER(sm)); |
| 442 |
p[0] *= d; |
| 443 |
p[1] *= d; |
| 444 |
p[2] *= d; |
| 445 |
VADD(p,p,SM_VIEW_CENTER(sm)); |
| 446 |
} |
| 447 |
else |
| 448 |
{ |
| 449 |
glColor3ub(SM_NTH_RGB(sm,ids[j])[0],SM_NTH_RGB(sm,ids[j])[1], |
| 450 |
SM_NTH_RGB(sm,ids[j])[2]); |
| 451 |
VCOPY(p,SM_NTH_WV(sm,ids[j])); |
| 452 |
} |
| 453 |
glVertex3d(p[0],p[1],p[2]); |
| 454 |
} |
| 455 |
} |
| 456 |
|
| 457 |
smRender_bg_tri(sm,i,vp,d,clr) |
| 458 |
SM *sm; |
| 459 |
int i; |
| 460 |
FVECT vp; |
| 461 |
double d; |
| 462 |
int clr; |
| 463 |
{ |
| 464 |
double p[3]; |
| 465 |
int j,id; |
| 466 |
TRI *tri; |
| 467 |
|
| 468 |
tri = SM_NTH_TRI(sm,i); |
| 469 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
| 470 |
|
| 471 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
| 472 |
tris: could change |
| 473 |
*/ |
| 474 |
for(j=2; j>= 0; j--) |
| 475 |
{ |
| 476 |
id = T_NTH_V(tri,j); |
| 477 |
glColor3ub(SM_NTH_RGB(sm,id)[0],SM_NTH_RGB(sm,id)[1], |
| 478 |
SM_NTH_RGB(sm,id)[2]); |
| 479 |
VSUB(p,SM_NTH_WV(sm,id),SM_VIEW_CENTER(sm)); |
| 480 |
if(dev_zmin >= 0.99) |
| 481 |
{ |
| 482 |
p[0] *= d; |
| 483 |
p[1] *= d; |
| 484 |
p[2] *= d; |
| 485 |
} |
| 486 |
VADD(p,p,vp); |
| 487 |
glVertex3d(p[0],p[1],p[2]); |
| 488 |
} |
| 489 |
} |
| 490 |
|
| 491 |
smRender_mesh(sm,vp,clr) |
| 492 |
SM *sm; |
| 493 |
FVECT vp; |
| 494 |
int clr; |
| 495 |
{ |
| 496 |
int i; |
| 497 |
TRI *tri; |
| 498 |
double ptr[3],d; |
| 499 |
int j; |
| 500 |
|
| 501 |
d = (dev_zmin+dev_zmax)/2.0; |
| 502 |
glPushAttrib(GL_DEPTH_BUFFER_BIT); |
| 503 |
|
| 504 |
/* First draw background polygons */ |
| 505 |
|
| 506 |
glDisable(GL_DEPTH_TEST); |
| 507 |
glBegin(GL_TRIANGLES); |
| 508 |
SM_FOR_ALL_ACTIVE_BG_TRIS(sm,i) |
| 509 |
smRender_bg_tri(sm,i,vp,d,clr); |
| 510 |
glEnd(); |
| 511 |
|
| 512 |
glEnable(GL_DEPTH_TEST); |
| 513 |
glBegin(GL_TRIANGLES); |
| 514 |
SM_FOR_ALL_ACTIVE_FG_TRIS(sm,i) |
| 515 |
{ |
| 516 |
if(!SM_MIXED_TRI(sm,i)) |
| 517 |
smRender_tri(sm,i,vp,clr); |
| 518 |
else |
| 519 |
smRender_mixed_tri(sm,i,vp,clr); |
| 520 |
} |
| 521 |
glEnd(); |
| 522 |
|
| 523 |
glPopAttrib(); |
| 524 |
} |
| 525 |
|
| 526 |
smRender_tri_edges(sm,i) |
| 527 |
SM *sm; |
| 528 |
int i; |
| 529 |
{ |
| 530 |
TRI *tri; |
| 531 |
int j; |
| 532 |
double ptr[3]; |
| 533 |
|
| 534 |
|
| 535 |
tri = SM_NTH_TRI(sm,i); |
| 536 |
|
| 537 |
/* Triangles are defined clockwise:historical relative to spherical |
| 538 |
tris: could change |
| 539 |
*/ |
| 540 |
for(j=2; j >=0; j--) |
| 541 |
{ |
| 542 |
VCOPY(ptr,SM_NTH_WV(sm,T_NTH_V(tri,j))); |
| 543 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
| 544 |
VCOPY(ptr,SM_NTH_WV(sm,T_NTH_V(tri,(j+1)%3))); |
| 545 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
| 546 |
} |
| 547 |
} |
| 548 |
|
| 549 |
int |
| 550 |
compare_tri_depths(T_DEPTH *td1,T_DEPTH *td2) |
| 551 |
{ |
| 552 |
double d; |
| 553 |
|
| 554 |
d = td2->depth-td1->depth; |
| 555 |
|
| 556 |
if(d > 0.0) |
| 557 |
return(1); |
| 558 |
if(d < 0.0) |
| 559 |
return(-1); |
| 560 |
|
| 561 |
return(0); |
| 562 |
} |
| 563 |
|
| 564 |
LIST |
| 565 |
*smDepth_sort_tris(sm,vp,td) |
| 566 |
SM *sm; |
| 567 |
FVECT vp; |
| 568 |
T_DEPTH *td; |
| 569 |
{ |
| 570 |
int i,j,t_id,v; |
| 571 |
TRI *tri; |
| 572 |
double d,min_d; |
| 573 |
LIST *tlist=NULL; |
| 574 |
|
| 575 |
i = 0; |
| 576 |
SM_FOR_ALL_NEW_TRIS(sm,t_id) |
| 577 |
{ |
| 578 |
if(SM_BG_TRI(sm,t_id)) |
| 579 |
{ |
| 580 |
tlist = push_data(tlist,t_id); |
| 581 |
continue; |
| 582 |
} |
| 583 |
tri = SM_NTH_TRI(sm,t_id); |
| 584 |
#ifdef DEBUG |
| 585 |
if(i >= smNew_tri_cnt) |
| 586 |
{ |
| 587 |
eputs("smDepth_sort_tris():More tris than reported by smNew_tri_cnt\n"); |
| 588 |
break; |
| 589 |
} |
| 590 |
#endif |
| 591 |
td[i].tri = t_id; |
| 592 |
min_d = -1; |
| 593 |
for(j=0;j < 3;j++) |
| 594 |
{ |
| 595 |
v = T_NTH_V(tri,j); |
| 596 |
if(!SM_BG_SAMPLE(sm,v)) |
| 597 |
{ |
| 598 |
d = DIST(vp,SM_NTH_WV(sm,v)); |
| 599 |
if(min_d == -1 || d < min_d) |
| 600 |
min_d = d; |
| 601 |
} |
| 602 |
} |
| 603 |
td[i].depth = min_d; |
| 604 |
i++; |
| 605 |
} |
| 606 |
td[i].tri = -1; |
| 607 |
if(i) |
| 608 |
qsort((void *)td,i,sizeof(T_DEPTH),compare_tri_depths); |
| 609 |
return(tlist); |
| 610 |
} |
| 611 |
|
| 612 |
|
| 613 |
smUpdate_Rendered_mesh(sm,vp,clr) |
| 614 |
SM *sm; |
| 615 |
FVECT vp; |
| 616 |
int clr; |
| 617 |
{ |
| 618 |
static T_DEPTH *td= NULL; |
| 619 |
static int tsize = 0; |
| 620 |
int i; |
| 621 |
GLint depth_test; |
| 622 |
double d; |
| 623 |
LIST *bglist; |
| 624 |
/* For all of the NEW triangles (since last update): assume |
| 625 |
ACTIVE. Go through and sort on depth value (from vp). Turn |
| 626 |
Depth Buffer test off and render back-front |
| 627 |
*/ |
| 628 |
/* NOTE: could malloc each time or hard code */ |
| 629 |
if(smNew_tri_cnt > tsize) |
| 630 |
{ |
| 631 |
if(td) |
| 632 |
free((char *)td); |
| 633 |
td = (T_DEPTH *)malloc(smNew_tri_cnt*sizeof(T_DEPTH)); |
| 634 |
tsize = smNew_tri_cnt; |
| 635 |
} |
| 636 |
if(!td) |
| 637 |
{ |
| 638 |
error(SYSTEM,"smUpdate_Rendered_mesh:Cannot allocate memory\n"); |
| 639 |
} |
| 640 |
bglist = smDepth_sort_tris(sm,vp,td); |
| 641 |
|
| 642 |
/* Turn Depth Test off -- using Painter's algorithm */ |
| 643 |
glPushAttrib(GL_DEPTH_BUFFER_BIT); |
| 644 |
glDisable(GL_DEPTH_TEST); |
| 645 |
d = (dev_zmin+dev_zmax)/2.0; |
| 646 |
/* Now render back-to front */ |
| 647 |
/* First render bg triangles */ |
| 648 |
glBegin(GL_TRIANGLES); |
| 649 |
while(bglist) |
| 650 |
smRender_bg_tri(sm,pop_list(&bglist),vp,d,clr); |
| 651 |
glEnd(); |
| 652 |
|
| 653 |
|
| 654 |
glBegin(GL_TRIANGLES); |
| 655 |
i=0; |
| 656 |
while(td[i].tri != -1) |
| 657 |
if(!SM_MIXED_TRI(sm,td[i].tri)) |
| 658 |
smRender_tri(sm,td[i++].tri,vp,clr); |
| 659 |
else |
| 660 |
smRender_mixed_tri(sm,td[i++].tri,vp,clr); |
| 661 |
glEnd(); |
| 662 |
|
| 663 |
/* Restore Depth Test */ |
| 664 |
glPopAttrib(); |
| 665 |
} |
| 666 |
|
| 667 |
/* |
| 668 |
* smUpdate(view, qua) : update OpenGL output geometry for view vp |
| 669 |
* VIEW *view; : desired view |
| 670 |
* int qual; : quality level (percentage on linear time scale) |
| 671 |
* |
| 672 |
* Draw new geometric representation using OpenGL calls. Assume that the |
| 673 |
* view has already been set up and the correct frame buffer has been |
| 674 |
* selected for drawing. The quality level is on a linear scale, where 100% |
| 675 |
* is full (final) quality. It is not necessary to redraw geometry that has |
| 676 |
* been output since the last call to smClean(). (The last view drawn will |
| 677 |
* be view==&odev.v each time.) |
| 678 |
*/ |
| 679 |
smUpdate(view,qual) |
| 680 |
VIEW *view; |
| 681 |
int qual; |
| 682 |
{ |
| 683 |
double d; |
| 684 |
int last_update; |
| 685 |
int t; |
| 686 |
|
| 687 |
/* If view has moved beyond epsilon from canonical: must rebuild - |
| 688 |
epsilon is calculated as running avg of distance of sample points |
| 689 |
from canonical view: m = 1/(AVG(1/r)): some fraction of this |
| 690 |
*/ |
| 691 |
d = DIST(view->vp,SM_VIEW_CENTER(smMesh)); |
| 692 |
if(qual >= 100 && d > SM_ALLOWED_VIEW_CHANGE(smMesh)) |
| 693 |
{ |
| 694 |
/* Re-build the mesh */ |
| 695 |
#ifdef TEST_DRIVER |
| 696 |
odev.v = *view; |
| 697 |
#endif |
| 698 |
smRebuild_mesh(smMesh,view->vp); |
| 699 |
} |
| 700 |
/* This is our final update iff qual==100 and view==&odev.v */ |
| 701 |
last_update = qual>=100 && view==&(odev.v); |
| 702 |
/* Check if we should draw ALL triangles in current frustum */ |
| 703 |
if(smClean_notify || smNew_tri_cnt > SM_NUM_TRIS(smMesh)*SM_INC_PERCENT) |
| 704 |
{ |
| 705 |
#ifdef TEST_DRIVER |
| 706 |
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 707 |
#else |
| 708 |
if (SM_TONE_MAP(smMesh) < SM_NUM_SAMP(smMesh)) |
| 709 |
{ |
| 710 |
tmClearHisto(); |
| 711 |
tmAddHisto(SM_BRT(smMesh),SM_NUM_SAMP(smMesh),1); |
| 712 |
if(tmComputeMapping(0.,0.,0.) != TM_E_OK || |
| 713 |
tmMapPixels(SM_RGB(smMesh),SM_BRT(smMesh),SM_CHR(smMesh), |
| 714 |
SM_NUM_SAMP(smMesh)) != TM_E_OK) |
| 715 |
return; |
| 716 |
} |
| 717 |
#endif |
| 718 |
mark_tris_in_frustum(view); |
| 719 |
if (qual <= 75) |
| 720 |
smRender_stree(smMesh,qual); |
| 721 |
else |
| 722 |
smRender_mesh(smMesh,view->vp,last_update); |
| 723 |
#ifdef TEST_DRIVER |
| 724 |
glFlush(); |
| 725 |
glutSwapBuffers(); |
| 726 |
#endif |
| 727 |
} |
| 728 |
/* Do an incremental update instead */ |
| 729 |
else |
| 730 |
{ |
| 731 |
if(!smNew_tri_cnt) |
| 732 |
return; |
| 733 |
#ifdef TEST_DRIVER |
| 734 |
glDrawBuffer(GL_FRONT); |
| 735 |
#else |
| 736 |
t = SM_TONE_MAP(smMesh); |
| 737 |
if(t == 0) |
| 738 |
{ |
| 739 |
tmClearHisto(); |
| 740 |
tmAddHisto(SM_BRT(smMesh),SM_NUM_SAMP(smMesh),1); |
| 741 |
if(tmComputeMapping(0.,0.,0.) != TM_E_OK) |
| 742 |
return; |
| 743 |
} |
| 744 |
if(tmMapPixels(SM_NTH_RGB(smMesh,t),&SM_NTH_BRT(smMesh,t), |
| 745 |
SM_NTH_CHR(smMesh,t), SM_NUM_SAMP(smMesh)-t) != TM_E_OK) |
| 746 |
return; |
| 747 |
#endif |
| 748 |
smUpdate_Rendered_mesh(smMesh,view->vp,last_update); |
| 749 |
|
| 750 |
#ifdef TEST_DRIVER |
| 751 |
glDrawBuffer(GL_BACK); |
| 752 |
#endif |
| 753 |
} |
| 754 |
SM_TONE_MAP(smMesh) = SM_NUM_SAMP(smMesh); |
| 755 |
if (last_update) |
| 756 |
{ |
| 757 |
smClean_notify = FALSE; |
| 758 |
smNew_tri_cnt = 0; |
| 759 |
smClear_flags(smMesh,T_NEW_FLAG); |
| 760 |
qtCache_init(0); |
| 761 |
} |
| 762 |
|
| 763 |
} |
