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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* sm_ogl.c |
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*/ |
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#include "standard.h" |
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|
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#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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|
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#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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|
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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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|
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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,fptr,arg1,arg2) |
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QUADTREE *qtptr; |
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int *fptr,arg1,*arg2; |
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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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|
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if (!QT_IS_LEAF(qt)) |
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return(TRUE); |
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|
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if(!QT_FLAG_FILL_TRI(*fptr)) |
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(*fptr)++; |
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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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|
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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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int |
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mark_active_interior(qtptr,q0,q1,q2,t0,t1,t2,n,arg1,arg2,arg3) |
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QUADTREE *qtptr; |
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FVECT q0,q1,q2; |
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FVECT t0,t1,t2; |
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int n; |
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int *arg1,arg2,*arg3; |
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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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|
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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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|
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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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|
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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 |
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*/ |
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/* Near face triangles */ |
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smLocator_apply_func(smMesh,nr[0],nr[2],nr[3],mark_active_tris, |
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mark_active_interior,NULL,NULL); |
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smLocator_apply_func(smMesh,nr[2],nr[0],nr[1],mark_active_tris, |
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mark_active_interior,NULL,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, |
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mark_active_interior,NULL,NULL); |
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smLocator_apply_func(smMesh,far[3],nr[0],nr[3],mark_active_tris, |
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mark_active_interior,NULL,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, |
144 |
mark_active_interior,NULL,NULL); |
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smLocator_apply_func(smMesh,far[2],nr[1],far[1],mark_active_tris, |
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mark_active_interior,NULL,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, |
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mark_active_interior,NULL,NULL); |
150 |
smLocator_apply_func(smMesh,nr[1],far[0],far[1],mark_active_tris, |
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mark_active_interior,NULL,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, |
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mark_active_interior,NULL,NULL); |
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smLocator_apply_func(smMesh,nr[2],far[2],far[3],mark_active_tris, |
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mark_active_interior,NULL,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, |
159 |
mark_active_interior,NULL,NULL); |
160 |
|
161 |
smLocator_apply_func(smMesh,far[2],far[0],far[3],mark_active_tris, |
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mark_active_interior,NULL,NULL); |
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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 |
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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; |
207 |
if (!(qt_hsiz = hsiztab[i])) |
208 |
qt_hsiz = nel*2 + 1; /* not always prime */ |
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qt_htbl = (QT_LUENT *)calloc(qt_hsiz, sizeof(QT_LUENT)); |
210 |
if (qt_htbl == NULL) |
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qt_hsiz = 0; |
212 |
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]); |
248 |
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; |
258 |
if (QT_IS_TREE(qt)) { |
259 |
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)); |
263 |
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; |
280 |
QTRAVG *rc[4]; |
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TRI *tri; |
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|
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if (QT_IS_EMPTY(qt)) /* empty leaf node */ |
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return(NULL); |
285 |
if (QT_IS_TREE(qt) && !QT_IS_FLAG(qt)) /* not in our frustum */ |
286 |
return(NULL); |
287 |
/* else look up node */ |
288 |
if ((le = qtCache_find(qt)) == NULL) |
289 |
error(SYSTEM, "out of memory in qtRender_level"); |
290 |
if (QT_IS_TREE(qt) && (QT_IS_EMPTY(le->qt) || lvl > 0)) |
291 |
{ /* compute children */ |
292 |
qtSubdivide_tri(v0,v1,v2,a,b,c); |
293 |
rc[0] = qtRender_level(QT_NTH_CHILD(qt,0),v0,a,c,sm,lvl-1); |
294 |
rc[1] = qtRender_level(QT_NTH_CHILD(qt,1),a,v1,b,sm,lvl-1); |
295 |
rc[2] = qtRender_level(QT_NTH_CHILD(qt,2),c,b,v2,sm,lvl-1); |
296 |
rc[3] = qtRender_level(QT_NTH_CHILD(qt,3),b,c,a,sm,lvl-1); |
297 |
} |
298 |
if (QT_IS_EMPTY(le->qt)) |
299 |
{ /* let's make some data! */ |
300 |
int rgbs[3]; |
301 |
double distsum; |
302 |
register int i, n; |
303 |
/* average our triangle vertices */ |
304 |
rgbs[0] = rgbs[1] = rgbs[2] = 0; |
305 |
distsum = 0.; n = 0; |
306 |
if(QT_IS_TREE(qt)) |
307 |
{ /* from subtree */ |
308 |
for (i = 4; i--; ) |
309 |
if (rc[i] != NULL) |
310 |
{ |
311 |
rgbs[0] += rc[i]->rgb[0]; rgbs[1] += rc[i]->rgb[1]; |
312 |
rgbs[2] += rc[i]->rgb[2]; distsum += rc[i]->dist; n++; |
313 |
} |
314 |
} |
315 |
else |
316 |
{ /* from triangle set */ |
317 |
OBJECT *os; |
318 |
int s0, s1, s2; |
319 |
|
320 |
os = qtqueryset(qt); |
321 |
for (n = os[0]; n; n--) |
322 |
{ |
323 |
tri = SM_NTH_TRI(sm,os[n]); |
324 |
s0 = T_NTH_V(tri,0); |
325 |
s1 = T_NTH_V(tri,1); |
326 |
s2 = T_NTH_V(tri,2); |
327 |
VCOPY(a,SM_NTH_WV(sm,s0)); |
328 |
VCOPY(b,SM_NTH_WV(sm,s1)); |
329 |
VCOPY(c,SM_NTH_WV(sm,s2)); |
330 |
distsum += SM_BG_SAMPLE(sm,s0) ? dev_zmax |
331 |
: sqrt(dist2(a,SM_VIEW_CENTER(sm))); |
332 |
distsum += SM_BG_SAMPLE(sm,s1) ? dev_zmax |
333 |
: sqrt(dist2(b,SM_VIEW_CENTER(sm))); |
334 |
distsum += SM_BG_SAMPLE(sm,s2) ? dev_zmax |
335 |
: sqrt(dist2(c,SM_VIEW_CENTER(sm))); |
336 |
rgbs[0] += SM_NTH_RGB(sm,s0)[0] + SM_NTH_RGB(sm,s1)[0] |
337 |
+ SM_NTH_RGB(sm,s2)[0]; |
338 |
rgbs[1] += SM_NTH_RGB(sm,s0)[1] + SM_NTH_RGB(sm,s1)[1] |
339 |
+ SM_NTH_RGB(sm,s2)[1]; |
340 |
rgbs[2] += SM_NTH_RGB(sm,s0)[2] + SM_NTH_RGB(sm,s1)[2] |
341 |
+ SM_NTH_RGB(sm,s2)[2]; |
342 |
} |
343 |
n = 3*os[0]; |
344 |
} |
345 |
if (!n) |
346 |
return(NULL); |
347 |
le->qt = qt; |
348 |
le->av.rgb[0] = rgbs[0]/n; le->av.rgb[1] = rgbs[1]/n; |
349 |
le->av.rgb[2] = rgbs[2]/n; le->av.dist = distsum/(double)n; |
350 |
} |
351 |
if (lvl == 0 || (lvl > 0 && QT_IS_LEAF(qt))) |
352 |
{ /* render this node */ |
353 |
/* compute pseudo vertices */ |
354 |
VCOPY(a,v0); VCOPY(b,v1); VCOPY(c,v2); |
355 |
normalize(a); normalize(b); normalize(c); |
356 |
VSUM(a,SM_VIEW_CENTER(sm),a,le->av.dist); |
357 |
VSUM(b,SM_VIEW_CENTER(sm),b,le->av.dist); |
358 |
VSUM(c,SM_VIEW_CENTER(sm),c,le->av.dist); |
359 |
/* draw triangle */ |
360 |
glColor3ub(le->av.rgb[0],le->av.rgb[1],le->av.rgb[2]); |
361 |
/* NOTE: Triangle vertex order may change */ |
362 |
glVertex3d(c[0],c[1],c[2]); |
363 |
glVertex3d(b[0],b[1],b[2]); |
364 |
glVertex3d(a[0],a[1],a[2]); |
365 |
} |
366 |
return(&le->av); |
367 |
} |
368 |
|
369 |
|
370 |
smRender_stree_level(sm,lvl) |
371 |
SM *sm; |
372 |
int lvl; |
373 |
{ |
374 |
QUADTREE root; |
375 |
int i; |
376 |
FVECT t0,t1,t2; |
377 |
|
378 |
if (lvl < 1) |
379 |
return; |
380 |
glPushAttrib(GL_LIGHTING_BIT); |
381 |
glShadeModel(GL_FLAT); |
382 |
glBegin(GL_TRIANGLES); |
383 |
for(i=0; i < 4; i++) |
384 |
{ |
385 |
root = ST_NTH_ROOT(SM_LOCATOR(sm),i); |
386 |
stNth_base_verts(SM_LOCATOR(sm),i,t0,t1,t2); |
387 |
qtRender_level(root,t0,t1,t2,sm,lvl-1); |
388 |
} |
389 |
glEnd(); |
390 |
glPopAttrib(); |
391 |
} |
392 |
|
393 |
|
394 |
smRender_stree(sm, qual) /* render some quadtree triangles */ |
395 |
SM *sm; |
396 |
int qual; |
397 |
{ |
398 |
int i, ntarget; |
399 |
int lvlcnt[QT_MAX_LEVELS]; |
400 |
|
401 |
if (qual <= 0) |
402 |
return; |
403 |
/* compute rendering target */ |
404 |
ntarget = 0; |
405 |
SM_FOR_ALL_ACTIVE_TRIS(sm,i) |
406 |
ntarget++; |
407 |
ntarget = ntarget*qual/100; |
408 |
if (!ntarget) |
409 |
return; |
410 |
for (i = QT_MAX_LEVELS; i--; ) |
411 |
lvlcnt[i] = 0; |
412 |
stCount_level_leaves(lvlcnt, SM_LOCATOR(sm)->root); |
413 |
for (ntarget -= lvlcnt[i=0]; i < QT_MAX_LEVELS-1; ntarget -= lvlcnt[++i]) |
414 |
if (ntarget < lvlcnt[i+1]) |
415 |
break; |
416 |
/* compute and render target level */ |
417 |
smRender_stree_level(sm,i); |
418 |
} |
419 |
|
420 |
|
421 |
smRender_tri(sm,i,vp,clr) |
422 |
SM *sm; |
423 |
int i; |
424 |
FVECT vp; |
425 |
int clr; |
426 |
{ |
427 |
TRI *tri; |
428 |
double ptr[3]; |
429 |
int j; |
430 |
|
431 |
tri = SM_NTH_TRI(sm,i); |
432 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
433 |
|
434 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
435 |
tris: could change |
436 |
*/ |
437 |
for(j=2; j>= 0; j--) |
438 |
{ |
439 |
#ifdef DEBUG |
440 |
if(SM_BG_SAMPLE(sm,T_NTH_V(tri,j))) |
441 |
eputs("SmRenderTri(): shouldnt have bg samples\n"); |
442 |
#endif |
443 |
glColor3ub(SM_NTH_RGB(sm,T_NTH_V(tri,j))[0], |
444 |
SM_NTH_RGB(sm,T_NTH_V(tri,j))[1], |
445 |
SM_NTH_RGB(sm,T_NTH_V(tri,j))[2]); |
446 |
VCOPY(ptr,SM_T_NTH_WV(sm,tri,j)); |
447 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
448 |
} |
449 |
} |
450 |
|
451 |
smRender_mixed_tri(sm,i,vp,clr) |
452 |
SM *sm; |
453 |
int i; |
454 |
FVECT vp; |
455 |
int clr; |
456 |
{ |
457 |
TRI *tri; |
458 |
double p[3],d; |
459 |
int j,ids[3],cnt; |
460 |
int rgb[3]; |
461 |
|
462 |
tri = SM_NTH_TRI(sm,i); |
463 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
464 |
|
465 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
466 |
tris: could change |
467 |
*/ |
468 |
cnt = 0; |
469 |
d = 0.0; |
470 |
rgb[0] = rgb[1] = rgb[2] = 0; |
471 |
for(j=0;j < 3;j++) |
472 |
{ |
473 |
ids[j] = T_NTH_V(tri,j); |
474 |
if(!SM_BG_SAMPLE(sm,ids[j])) |
475 |
{ |
476 |
rgb[0] += SM_NTH_RGB(sm,ids[j])[0]; |
477 |
rgb[1] += SM_NTH_RGB(sm,ids[j])[1]; |
478 |
rgb[2] += SM_NTH_RGB(sm,ids[j])[2]; |
479 |
cnt++; |
480 |
d += DIST(vp,SM_NTH_WV(sm,ids[j])); |
481 |
} |
482 |
} |
483 |
if(cnt > 1) |
484 |
{ |
485 |
rgb[0]/=cnt; rgb[1]/=cnt; rgb[2]/=cnt; |
486 |
d /= (double)cnt; |
487 |
} |
488 |
for(j=2; j>= 0; j--) |
489 |
{ |
490 |
if(SM_BG_SAMPLE(sm,ids[j])) |
491 |
{ |
492 |
glColor3ub(rgb[0],rgb[1],rgb[2]); |
493 |
VSUB(p,SM_NTH_WV(sm,ids[j]),SM_VIEW_CENTER(sm)); |
494 |
p[0] *= d; |
495 |
p[1] *= d; |
496 |
p[2] *= d; |
497 |
VADD(p,p,SM_VIEW_CENTER(sm)); |
498 |
} |
499 |
else |
500 |
{ |
501 |
glColor3ub(SM_NTH_RGB(sm,ids[j])[0],SM_NTH_RGB(sm,ids[j])[1], |
502 |
SM_NTH_RGB(sm,ids[j])[2]); |
503 |
VCOPY(p,SM_NTH_WV(sm,ids[j])); |
504 |
} |
505 |
glVertex3d(p[0],p[1],p[2]); |
506 |
} |
507 |
} |
508 |
|
509 |
smRender_bg_tri(sm,i,vp,d,clr) |
510 |
SM *sm; |
511 |
int i; |
512 |
FVECT vp; |
513 |
double d; |
514 |
int clr; |
515 |
{ |
516 |
double p[3]; |
517 |
int j,id; |
518 |
TRI *tri; |
519 |
|
520 |
tri = SM_NTH_TRI(sm,i); |
521 |
if (clr) SM_CLEAR_NTH_T_NEW(sm,i); |
522 |
|
523 |
/* NOTE:Triangles are defined clockwise:historical relative to spherical |
524 |
tris: could change |
525 |
*/ |
526 |
for(j=2; j>= 0; j--) |
527 |
{ |
528 |
id = T_NTH_V(tri,j); |
529 |
glColor3ub(SM_NTH_RGB(sm,id)[0],SM_NTH_RGB(sm,id)[1], |
530 |
SM_NTH_RGB(sm,id)[2]); |
531 |
VSUB(p,SM_NTH_WV(sm,id),SM_VIEW_CENTER(sm)); |
532 |
if(dev_zmin >= 0.99) |
533 |
{ |
534 |
p[0] *= d; |
535 |
p[1] *= d; |
536 |
p[2] *= d; |
537 |
} |
538 |
VADD(p,p,vp); |
539 |
glVertex3d(p[0],p[1],p[2]); |
540 |
} |
541 |
} |
542 |
|
543 |
smRender_mesh(sm,vp,clr) |
544 |
SM *sm; |
545 |
FVECT vp; |
546 |
int clr; |
547 |
{ |
548 |
int i; |
549 |
TRI *tri; |
550 |
double ptr[3],d; |
551 |
int j; |
552 |
|
553 |
d = (dev_zmin+dev_zmax)/2.0; |
554 |
glPushAttrib(GL_DEPTH_BUFFER_BIT); |
555 |
|
556 |
/* First draw background polygons */ |
557 |
|
558 |
glDisable(GL_DEPTH_TEST); |
559 |
glBegin(GL_TRIANGLES); |
560 |
SM_FOR_ALL_ACTIVE_BG_TRIS(sm,i) |
561 |
smRender_bg_tri(sm,i,vp,d,clr); |
562 |
glEnd(); |
563 |
|
564 |
glEnable(GL_DEPTH_TEST); |
565 |
glBegin(GL_TRIANGLES); |
566 |
SM_FOR_ALL_ACTIVE_FG_TRIS(sm,i) |
567 |
{ |
568 |
if(!SM_MIXED_TRI(sm,i)) |
569 |
smRender_tri(sm,i,vp,clr); |
570 |
else |
571 |
smRender_mixed_tri(sm,i,vp,clr); |
572 |
} |
573 |
glEnd(); |
574 |
|
575 |
glPopAttrib(); |
576 |
} |
577 |
|
578 |
smRender_tri_edges(sm,i) |
579 |
SM *sm; |
580 |
int i; |
581 |
{ |
582 |
TRI *tri; |
583 |
int j; |
584 |
double ptr[3]; |
585 |
|
586 |
|
587 |
tri = SM_NTH_TRI(sm,i); |
588 |
|
589 |
/* Triangles are defined clockwise:historical relative to spherical |
590 |
tris: could change |
591 |
*/ |
592 |
for(j=2; j >=0; j--) |
593 |
{ |
594 |
VCOPY(ptr,SM_NTH_WV(sm,T_NTH_V(tri,j))); |
595 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
596 |
VCOPY(ptr,SM_NTH_WV(sm,T_NTH_V(tri,(j+1)%3))); |
597 |
glVertex3d(ptr[0],ptr[1],ptr[2]); |
598 |
} |
599 |
} |
600 |
|
601 |
int |
602 |
compare_tri_depths(T_DEPTH *td1,T_DEPTH *td2) |
603 |
{ |
604 |
double d; |
605 |
|
606 |
d = td2->depth-td1->depth; |
607 |
|
608 |
if(d > 0.0) |
609 |
return(1); |
610 |
if(d < 0.0) |
611 |
return(-1); |
612 |
|
613 |
return(0); |
614 |
} |
615 |
|
616 |
LIST |
617 |
*smDepth_sort_tris(sm,vp,td) |
618 |
SM *sm; |
619 |
FVECT vp; |
620 |
T_DEPTH *td; |
621 |
{ |
622 |
int i,j,t_id,v; |
623 |
TRI *tri; |
624 |
double d,min_d; |
625 |
LIST *tlist=NULL; |
626 |
|
627 |
i = 0; |
628 |
SM_FOR_ALL_NEW_TRIS(sm,t_id) |
629 |
{ |
630 |
if(SM_BG_TRI(sm,t_id)) |
631 |
{ |
632 |
tlist = push_data(tlist,t_id); |
633 |
continue; |
634 |
} |
635 |
tri = SM_NTH_TRI(sm,t_id); |
636 |
#ifdef DEBUG |
637 |
if(i >= smNew_tri_cnt) |
638 |
{ |
639 |
eputs("smDepth_sort_tris():More tris than reported by smNew_tri_cnt\n"); |
640 |
break; |
641 |
} |
642 |
#endif |
643 |
td[i].tri = t_id; |
644 |
min_d = -1; |
645 |
for(j=0;j < 3;j++) |
646 |
{ |
647 |
v = T_NTH_V(tri,j); |
648 |
if(!SM_BG_SAMPLE(sm,v)) |
649 |
{ |
650 |
d = DIST(vp,SM_NTH_WV(sm,v)); |
651 |
if(min_d == -1 || d < min_d) |
652 |
min_d = d; |
653 |
} |
654 |
} |
655 |
td[i].depth = min_d; |
656 |
i++; |
657 |
} |
658 |
td[i].tri = -1; |
659 |
if(i) |
660 |
qsort((void *)td,i,sizeof(T_DEPTH),compare_tri_depths); |
661 |
return(tlist); |
662 |
} |
663 |
|
664 |
|
665 |
smUpdate_Rendered_mesh(sm,vp,clr) |
666 |
SM *sm; |
667 |
FVECT vp; |
668 |
int clr; |
669 |
{ |
670 |
static T_DEPTH *td= NULL; |
671 |
static int tsize = 0; |
672 |
int i; |
673 |
GLint depth_test; |
674 |
double d; |
675 |
LIST *bglist; |
676 |
/* For all of the NEW triangles (since last update): assume |
677 |
ACTIVE. Go through and sort on depth value (from vp). Turn |
678 |
Depth Buffer test off and render back-front |
679 |
*/ |
680 |
/* NOTE: could malloc each time or hard code */ |
681 |
if(smNew_tri_cnt > tsize) |
682 |
{ |
683 |
if(td) |
684 |
free((char *)td); |
685 |
td = (T_DEPTH *)malloc(smNew_tri_cnt*sizeof(T_DEPTH)); |
686 |
tsize = smNew_tri_cnt; |
687 |
} |
688 |
if(!td) |
689 |
{ |
690 |
error(SYSTEM,"smUpdate_Rendered_mesh:Cannot allocate memory\n"); |
691 |
} |
692 |
bglist = smDepth_sort_tris(sm,vp,td); |
693 |
|
694 |
/* Turn Depth Test off -- using Painter's algorithm */ |
695 |
glPushAttrib(GL_DEPTH_BUFFER_BIT); |
696 |
glDisable(GL_DEPTH_TEST); |
697 |
d = (dev_zmin+dev_zmax)/2.0; |
698 |
/* Now render back-to front */ |
699 |
/* First render bg triangles */ |
700 |
glBegin(GL_TRIANGLES); |
701 |
while(bglist) |
702 |
smRender_bg_tri(sm,pop_list(&bglist),vp,d,clr); |
703 |
glEnd(); |
704 |
|
705 |
|
706 |
glBegin(GL_TRIANGLES); |
707 |
i=0; |
708 |
while(td[i].tri != -1) |
709 |
if(!SM_MIXED_TRI(sm,td[i].tri)) |
710 |
smRender_tri(sm,td[i++].tri,vp,clr); |
711 |
else |
712 |
smRender_mixed_tri(sm,td[i++].tri,vp,clr); |
713 |
glEnd(); |
714 |
|
715 |
/* Restore Depth Test */ |
716 |
glPopAttrib(); |
717 |
} |
718 |
|
719 |
/* |
720 |
* smUpdate(view, qua) : update OpenGL output geometry for view vp |
721 |
* VIEW *view; : desired view |
722 |
* int qual; : quality level (percentage on linear time scale) |
723 |
* |
724 |
* Draw new geometric representation using OpenGL calls. Assume that the |
725 |
* view has already been set up and the correct frame buffer has been |
726 |
* selected for drawing. The quality level is on a linear scale, where 100% |
727 |
* is full (final) quality. It is not necessary to redraw geometry that has |
728 |
* been output since the last call to smClean(). (The last view drawn will |
729 |
* be view==&odev.v each time.) |
730 |
*/ |
731 |
smUpdate(view,qual) |
732 |
VIEW *view; |
733 |
int qual; |
734 |
{ |
735 |
double d; |
736 |
int last_update; |
737 |
int t; |
738 |
|
739 |
/* If view has moved beyond epsilon from canonical: must rebuild - |
740 |
epsilon is calculated as running avg of distance of sample points |
741 |
from canonical view: m = 1/(AVG(1/r)): some fraction of this |
742 |
*/ |
743 |
d = DIST(view->vp,SM_VIEW_CENTER(smMesh)); |
744 |
if(qual >= 100 && d > SM_ALLOWED_VIEW_CHANGE(smMesh)) |
745 |
{ |
746 |
/* Re-build the mesh */ |
747 |
#ifdef TEST_DRIVER |
748 |
odev.v = *view; |
749 |
#endif |
750 |
smRebuild_mesh(smMesh,view->vp); |
751 |
} |
752 |
/* This is our final update iff qual==100 and view==&odev.v */ |
753 |
last_update = qual>=100 && view==&(odev.v); |
754 |
/* Check if we should draw ALL triangles in current frustum */ |
755 |
if(smClean_notify || smNew_tri_cnt > SM_NUM_TRIS(smMesh)*SM_INC_PERCENT) |
756 |
{ |
757 |
#ifdef TEST_DRIVER |
758 |
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
759 |
#else |
760 |
if (SM_TONE_MAP(smMesh) < SM_NUM_SAMP(smMesh)) |
761 |
{ |
762 |
tmClearHisto(); |
763 |
tmAddHisto(SM_BRT(smMesh),SM_NUM_SAMP(smMesh),1); |
764 |
if(tmComputeMapping(0.,0.,0.) != TM_E_OK || |
765 |
tmMapPixels(SM_RGB(smMesh),SM_BRT(smMesh),SM_CHR(smMesh), |
766 |
SM_NUM_SAMP(smMesh)) != TM_E_OK) |
767 |
return; |
768 |
} |
769 |
#endif |
770 |
mark_tris_in_frustum(view); |
771 |
if (qual <= 75) |
772 |
smRender_stree(smMesh,qual); |
773 |
else |
774 |
smRender_mesh(smMesh,view->vp,last_update); |
775 |
#ifdef TEST_DRIVER |
776 |
glFlush(); |
777 |
glutSwapBuffers(); |
778 |
#endif |
779 |
} |
780 |
/* Do an incremental update instead */ |
781 |
else |
782 |
{ |
783 |
if(!smNew_tri_cnt) |
784 |
return; |
785 |
#ifdef TEST_DRIVER |
786 |
glDrawBuffer(GL_FRONT); |
787 |
#else |
788 |
t = SM_TONE_MAP(smMesh); |
789 |
if(t == 0) |
790 |
{ |
791 |
tmClearHisto(); |
792 |
tmAddHisto(SM_BRT(smMesh),SM_NUM_SAMP(smMesh),1); |
793 |
if(tmComputeMapping(0.,0.,0.) != TM_E_OK) |
794 |
return; |
795 |
} |
796 |
if(tmMapPixels(SM_NTH_RGB(smMesh,t),&SM_NTH_BRT(smMesh,t), |
797 |
SM_NTH_CHR(smMesh,t), SM_NUM_SAMP(smMesh)-t) != TM_E_OK) |
798 |
return; |
799 |
#endif |
800 |
smUpdate_Rendered_mesh(smMesh,view->vp,last_update); |
801 |
|
802 |
#ifdef TEST_DRIVER |
803 |
glDrawBuffer(GL_BACK); |
804 |
#endif |
805 |
} |
806 |
SM_TONE_MAP(smMesh) = SM_NUM_SAMP(smMesh); |
807 |
if (last_update) |
808 |
{ |
809 |
smClean_notify = FALSE; |
810 |
smNew_tri_cnt = 0; |
811 |
smClear_flags(smMesh,T_NEW_FLAG); |
812 |
qtCache_init(0); |
813 |
} |
814 |
|
815 |
} |