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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
|
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#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ SGI"; |
5 |
#endif |
6 |
|
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/* |
8 |
* OpenGL driver for holodeck display. |
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* Based on GLX driver using T-mesh. |
10 |
* |
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* Define symbol STEREO for stereo viewing. |
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* Define symbol DOBJ for display object viewing. |
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*/ |
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|
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#ifdef NOSTEREO |
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#ifdef STEREO |
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#undef STEREO |
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#else |
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#undef NOSTEREO |
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#endif |
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#endif |
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|
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#include "standard.h" |
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|
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#include <sys/types.h> |
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#include <GL/glx.h> |
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#include <GL/glu.h> |
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#ifdef STEREO |
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#include <X11/extensions/SGIStereo.h> |
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#endif |
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|
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#include "rhd_odraw.h" |
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#ifdef DOBJ |
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#include "rhdobj.h" |
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#endif |
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|
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#include "x11icon.h" |
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|
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#ifndef RAYQLEN |
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#define RAYQLEN 50000 /* max. rays to queue before flush */ |
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#endif |
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|
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/* values other than 0 or 255 do not map reliably */ |
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#ifndef PORTALP |
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#define PORTRED 0 /* -1, 0 or 255 */ |
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#define PORTGRN -1 /* -1, 0 or 255 */ |
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#define PORTBLU 255 /* -1, 0 or 255 */ |
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#define PORTALP -1 /* -1 or 255 */ |
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#endif |
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#define isportal(c) ((PORTRED<0 || (c)[0]==PORTRED) && \ |
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(PORTGRN<0 || (c)[1]==PORTGRN) && \ |
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(PORTBLU<0 || (c)[2]==PORTBLU) && \ |
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(PORTALP<0 || (c)[3]==PORTALP)) |
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#define doportals() if (gmPortals) \ |
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gmDrawPortals(PORTRED,PORTGRN,PORTBLU,PORTALP); else |
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|
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#ifndef FEQ |
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#define FEQ(a,b) ((a)-(b) <= FTINY && (a)-(b) >= -FTINY) |
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#endif |
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|
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#define VWHEADLOCK 01 /* head position is locked flag */ |
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#define VWPERSP 02 /* perspective view is set */ |
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#define VWORTHO 04 /* orthographic view is set */ |
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#define VWCHANGE 010 /* view has changed */ |
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#define VWSTEADY 020 /* view is now steady */ |
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#define VWMAPPED 040 /* window is mapped */ |
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|
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#define GAMMA 1.4 /* default gamma correction */ |
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|
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#define FRAMESTATE(s) (((s)&(ShiftMask|ControlMask))==(ShiftMask|ControlMask)) |
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|
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#define MOVPCT 7 /* percent distance to move /frame */ |
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#define MOVDIR(b) ((b)==Button1 ? 1 : (b)==Button2 ? 0 : -1) |
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#define MOVDEG (-5) /* degrees to orbit CW/down /frame */ |
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#define MOVORB(s) ((s)&ShiftMask ? 1 : (s)&ControlMask ? -1 : 0) |
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|
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#define MINWIDTH 480 /* minimum graphics window width */ |
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#define MINHEIGHT 400 /* minimum graphics window height */ |
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|
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#define VIEWDIST 356 /* assumed viewing distance (mm) */ |
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|
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#define BORWIDTH 5 /* border width */ |
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|
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#define setstereobuf(bid) (glXWaitGL(), \ |
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XSGISetStereoBuffer(ourdisplay, gwind, bid), \ |
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glXWaitX()) |
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|
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#define ourscreen DefaultScreen(ourdisplay) |
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#define ourroot RootWindow(ourdisplay,ourscreen) |
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#define ourmask (StructureNotifyMask|ExposureMask|KeyPressMask|\ |
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ButtonPressMask|ButtonReleaseMask) |
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|
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#define levptr(etype) ((etype *)¤tevent) |
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|
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struct driver odev; /* global device driver structure */ |
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|
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char odev_args[64]; /* command arguments */ |
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|
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static GLfloat *depthbuffer = NULL; /* depth buffer */ |
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|
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#ifdef STEREO |
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static VIEW vwright; /* right eye view */ |
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static GLfloat *depthright = NULL; /* right depth buffer */ |
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#endif |
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|
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static int rayqleft = 0; /* rays left to queue before flush */ |
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|
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static XEvent currentevent; /* current event */ |
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|
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static unsigned long ourblack=0, ourwhite=~0; |
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|
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static Display *ourdisplay = NULL; /* our display */ |
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static XVisualInfo *ourvinf; /* our visual information */ |
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static Window gwind = 0; /* our graphics window */ |
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static GLXContext gctx; /* our GLX context */ |
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|
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static double pwidth, pheight; /* pixel dimensions (mm) */ |
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|
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static double dev_zmin, dev_zmax; /* fore and aft clipping plane dist. */ |
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static double dev_zrat; /* (1. - dev_zmin/dev_zmax) */ |
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|
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#define setzrat() (dev_zrat = 1. - dev_zmin/dev_zmax) |
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#define mapdepth(d) ((d)>0.9995 ? FHUGE : dev_zmin/(1.-(d)*dev_zrat)) |
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|
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static int inpresflags; /* input result flags */ |
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|
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static int viewflags; /* what's happening with view */ |
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|
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static int resizewindow(), getevent(), getkey(), moveview(), wipeclean(), |
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xferdepth(), freedepth(), setglortho(), |
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setglpersp(), getframe(), getmove(), fixwindow(), mytmflags(); |
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|
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static double getdistance(); |
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|
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#ifdef STEREO |
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static int pushright(), popright(); |
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#endif |
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|
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extern int gmPortals; /* GL portal list id */ |
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|
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extern time_t time(); |
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|
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|
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dev_open(id) /* initialize GLX driver */ |
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char *id; |
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{ |
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extern char *getenv(); |
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static RGBPRIMS myprims = STDPRIMS; |
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#if (PORTALP<0) |
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static int atlBest[] = {GLX_RGBA, GLX_DOUBLEBUFFER, |
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GLX_RED_SIZE,8, GLX_GREEN_SIZE,8, |
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GLX_BLUE_SIZE,8, GLX_DEPTH_SIZE,15, None}; |
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static int atlOK[] = {GLX_RGBA, GLX_DOUBLEBUFFER, |
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GLX_RED_SIZE,4, GLX_GREEN_SIZE,4, |
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GLX_BLUE_SIZE,4, GLX_DEPTH_SIZE,15, None}; |
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#else |
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static int atlBest[] = {GLX_RGBA, GLX_DOUBLEBUFFER, |
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GLX_RED_SIZE,8, GLX_GREEN_SIZE,8, |
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GLX_BLUE_SIZE,8, GLX_ALPHA_SIZE,1, |
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GLX_DEPTH_SIZE,15, None}; |
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static int atlOK[] = {GLX_RGBA, GLX_DOUBLEBUFFER, |
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GLX_RED_SIZE,5, GLX_GREEN_SIZE,5, |
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GLX_BLUE_SIZE,5, GLX_ALPHA_SIZE,1, |
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GLX_DEPTH_SIZE,15, None}; |
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#endif |
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char *ev; |
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double gamval = GAMMA; |
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RGBPRIMP dpri = stdprims; |
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XSetWindowAttributes ourwinattr; |
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XWMHints ourxwmhints; |
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XSizeHints oursizhints; |
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/* check for unsupported stereo */ |
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#ifdef NOSTEREO |
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error(INTERNAL, "stereo display driver unavailable"); |
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#endif |
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/* open display server */ |
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ourdisplay = XOpenDisplay(NULL); |
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CHECK(ourdisplay==NULL, USER, |
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"cannot open X-windows; DISPLAY variable set?"); |
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#ifdef STEREO |
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switch (XSGIQueryStereoMode(ourdisplay, ourroot)) { |
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case STEREO_TOP: |
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case STEREO_BOTTOM: |
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break; |
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case STEREO_OFF: |
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error(USER, |
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"wrong video mode: run \"/usr/gfx/setmon -n STR_TOP\" first"); |
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case X_STEREO_UNSUPPORTED: |
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error(USER, "stereo mode not supported on this screen"); |
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default: |
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error(INTERNAL, "unknown stereo mode"); |
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} |
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#endif |
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/* find a usable visual */ |
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ourvinf = glXChooseVisual(ourdisplay, ourscreen, atlBest); |
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if (ourvinf == NULL) |
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ourvinf = glXChooseVisual(ourdisplay, ourscreen, atlOK); |
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CHECK(ourvinf==NULL, USER, "no suitable visuals available"); |
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/* get a context */ |
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gctx = glXCreateContext(ourdisplay, ourvinf, NULL, GL_TRUE); |
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/* set gamma and tone mapping */ |
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if ((ev = XGetDefault(ourdisplay, "radiance", "gamma")) != NULL |
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|| (ev = getenv("DISPLAY_GAMMA")) != NULL) |
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gamval = atof(ev); |
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if ((ev = getenv("DISPLAY_PRIMARIES")) != NULL && |
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sscanf(ev, "%f %f %f %f %f %f %f %f", |
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&myprims[RED][CIEX],&myprims[RED][CIEY], |
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&myprims[GRN][CIEX],&myprims[GRN][CIEY], |
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&myprims[BLU][CIEX],&myprims[BLU][CIEY], |
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&myprims[WHT][CIEX],&myprims[WHT][CIEY]) >= 6) |
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dpri = myprims; |
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if (tmInit(mytmflags(), dpri, gamval) == NULL) |
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error(SYSTEM, "not enough memory in dev_open"); |
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/* open window */ |
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ourwinattr.background_pixel = ourblack; |
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ourwinattr.border_pixel = ourblack; |
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ourwinattr.event_mask = ourmask; |
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/* this is stupid */ |
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ourwinattr.colormap = XCreateColormap(ourdisplay, ourroot, |
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ourvinf->visual, AllocNone); |
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gwind = XCreateWindow(ourdisplay, ourroot, 0, 0, |
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DisplayWidth(ourdisplay,ourscreen)-2*BORWIDTH, |
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#ifdef STEREO |
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(DisplayHeight(ourdisplay,ourscreen)-2*BORWIDTH)/2, |
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#else |
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DisplayHeight(ourdisplay,ourscreen)-2*BORWIDTH, |
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#endif |
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BORWIDTH, ourvinf->depth, InputOutput, ourvinf->visual, |
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CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &ourwinattr); |
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CHECK(gwind==0, SYSTEM, "cannot create window"); |
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XStoreName(ourdisplay, gwind, id); |
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/* set window manager hints */ |
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ourxwmhints.flags = InputHint|IconPixmapHint; |
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ourxwmhints.input = True; |
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ourxwmhints.icon_pixmap = XCreateBitmapFromData(ourdisplay, |
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gwind, x11icon_bits, x11icon_width, x11icon_height); |
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XSetWMHints(ourdisplay, gwind, &ourxwmhints); |
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oursizhints.min_width = MINWIDTH; |
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#ifdef STEREO |
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oursizhints.min_height = MINHEIGHT/2; |
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oursizhints.max_width = DisplayWidth(ourdisplay,ourscreen)-2*BORWIDTH; |
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oursizhints.max_height = (DisplayHeight(ourdisplay,ourscreen) - |
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2*BORWIDTH)/2; |
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oursizhints.flags = PMinSize|PMaxSize; |
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#else |
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oursizhints.min_height = MINHEIGHT; |
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oursizhints.flags = PMinSize; |
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#endif |
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XSetNormalHints(ourdisplay, gwind, &oursizhints); |
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/* set GLX context */ |
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glXMakeCurrent(ourdisplay, gwind, gctx); |
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glEnable(GL_DEPTH_TEST); |
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glDepthFunc(GL_LEQUAL); |
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glEnable(GL_DITHER); |
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glFrontFace(GL_CCW); |
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glDisable(GL_CULL_FACE); |
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glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); |
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); |
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/* figure out sensible view */ |
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pwidth = (double)DisplayWidthMM(ourdisplay, ourscreen) / |
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DisplayWidth(ourdisplay, ourscreen); |
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pheight = (double)DisplayHeightMM(ourdisplay, ourscreen) / |
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DisplayHeight(ourdisplay, ourscreen); |
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#ifdef STEREO |
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pheight *= 2.; |
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setstereobuf(STEREO_BUFFER_LEFT); |
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#endif |
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checkglerr("setting rendering parameters"); |
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copystruct(&odev.v, &stdview); |
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odev.v.type = VT_PER; |
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viewflags = VWSTEADY; /* view starts static */ |
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/* map the window */ |
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XMapWindow(ourdisplay, gwind); |
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dev_input(); /* sets size and view angles */ |
275 |
if (!odInit(DisplayWidth(ourdisplay,ourscreen) * |
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DisplayHeight(ourdisplay,ourscreen) / 4)) |
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error(SYSTEM, "insufficient memory for value storage"); |
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odev.name = id; |
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odev.firstuse = 1; /* can't recycle samples */ |
280 |
odev.ifd = ConnectionNumber(ourdisplay); |
281 |
} |
282 |
|
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|
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dev_close() /* close our display and free resources */ |
285 |
{ |
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#ifdef DOBJ |
287 |
dobj_cleanup(); |
288 |
#endif |
289 |
freedepth(); |
290 |
gmEndGeom(); |
291 |
gmEndPortal(); |
292 |
odDone(); |
293 |
glXMakeCurrent(ourdisplay, None, NULL); |
294 |
glXDestroyContext(ourdisplay, gctx); |
295 |
XDestroyWindow(ourdisplay, gwind); |
296 |
gwind = 0; |
297 |
XCloseDisplay(ourdisplay); |
298 |
ourdisplay = NULL; |
299 |
tmDone(NULL); |
300 |
odev.v.type = 0; |
301 |
odev.hres = odev.vres = 0; |
302 |
odev.ifd = -1; |
303 |
} |
304 |
|
305 |
|
306 |
dev_clear() /* clear our representation */ |
307 |
{ |
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wipeclean(); |
309 |
rayqleft = 0; /* hold off update */ |
310 |
} |
311 |
|
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|
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int |
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dev_view(nv) /* assign new driver view */ |
315 |
register VIEW *nv; |
316 |
{ |
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double d; |
318 |
|
319 |
if (nv->type != VT_PER || /* check view legality */ |
320 |
nv->horiz > 160. || nv->vert > 160.) { |
321 |
error(COMMAND, "illegal view type/angle"); |
322 |
nv->type = odev.v.type; |
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nv->horiz = odev.v.horiz; |
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nv->vert = odev.v.vert; |
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return(0); |
326 |
} |
327 |
if (nv != &odev.v) { |
328 |
/* resize window? */ |
329 |
if (!FEQ(nv->horiz,odev.v.horiz) || |
330 |
!FEQ(nv->vert,odev.v.vert)) { |
331 |
int dw = DisplayWidth(ourdisplay,ourscreen); |
332 |
int dh = DisplayHeight(ourdisplay,ourscreen); |
333 |
|
334 |
dw -= 25; /* for window frame */ |
335 |
dh -= 50; |
336 |
#ifdef STEREO |
337 |
dh /= 2; |
338 |
#endif |
339 |
odev.hres = 2.*VIEWDIST/pwidth * |
340 |
tan(PI/180./2.*nv->horiz); |
341 |
odev.vres = 2.*VIEWDIST/pheight * |
342 |
tan(PI/180./2.*nv->vert); |
343 |
if (odev.hres > dw) { |
344 |
odev.vres = dw * odev.vres / odev.hres; |
345 |
odev.hres = dw; |
346 |
} |
347 |
if (odev.vres > dh) { |
348 |
odev.hres = dh * odev.hres / odev.vres; |
349 |
odev.vres = dh; |
350 |
} |
351 |
XResizeWindow(ourdisplay, gwind, odev.hres, odev.vres); |
352 |
dev_input(); /* get resize event */ |
353 |
} |
354 |
copystruct(&odev.v, nv); /* setview() already called */ |
355 |
#ifdef STEREO |
356 |
copystruct(&vwright, nv); |
357 |
d = eyesepdist / sqrt(nv->hn2); |
358 |
VSUM(vwright.vp, nv->vp, nv->hvec, d); |
359 |
/* setview(&vwright); -- Unnecessary */ |
360 |
#endif |
361 |
viewflags |= VWCHANGE; |
362 |
} |
363 |
wipeclean(); |
364 |
return(1); |
365 |
} |
366 |
|
367 |
|
368 |
dev_section(gfn, pfn) /* add octree for geometry rendering */ |
369 |
char *gfn, *pfn; |
370 |
{ |
371 |
extern char *index(); |
372 |
char *cp; |
373 |
|
374 |
if (gfn == NULL) { |
375 |
gmEndGeom(); |
376 |
gmEndPortal(); |
377 |
wipeclean(); /* new geometry, so redraw it */ |
378 |
return; |
379 |
} |
380 |
if (access(gfn, R_OK) == 0) |
381 |
gmNewGeom(gfn); |
382 |
#ifdef DEBUG |
383 |
else { |
384 |
sprintf(errmsg, "cannot load octree \"%s\"", gfn); |
385 |
error(WARNING, errmsg); |
386 |
} |
387 |
#endif |
388 |
if (pfn != NULL) |
389 |
gmNewPortal(pfn); |
390 |
} |
391 |
|
392 |
|
393 |
dev_auxcom(cmd, args) /* process an auxiliary command */ |
394 |
char *cmd, *args; |
395 |
{ |
396 |
#ifdef DOBJ |
397 |
if (dobj_command(cmd, args) >= 0) |
398 |
return; |
399 |
#endif |
400 |
sprintf(errmsg, "%s: unknown command", cmd); |
401 |
error(COMMAND, errmsg); |
402 |
} |
403 |
|
404 |
|
405 |
VIEW * |
406 |
dev_auxview(n, hvres) /* return nth auxiliary view */ |
407 |
int n; |
408 |
int hvres[2]; |
409 |
{ |
410 |
hvres[0] = odev.hres; hvres[1] = odev.vres; |
411 |
if (n == 0) |
412 |
return(&odev.v); |
413 |
#ifdef STEREO |
414 |
if (n == 1) |
415 |
return(&vwright); |
416 |
#endif |
417 |
return(NULL); |
418 |
} |
419 |
|
420 |
|
421 |
int |
422 |
dev_input() /* get X11 input */ |
423 |
{ |
424 |
inpresflags = 0; |
425 |
|
426 |
do |
427 |
getevent(); |
428 |
|
429 |
while (XPending(ourdisplay) > 0); |
430 |
|
431 |
odev.inpready = 0; |
432 |
|
433 |
return(inpresflags); |
434 |
} |
435 |
|
436 |
|
437 |
dev_value(c, d, p) /* add a pixel value to our texture */ |
438 |
COLR c; |
439 |
FVECT d, p; |
440 |
{ |
441 |
#ifdef DOBJ |
442 |
if (dobj_lightsamp != NULL) { /* in light source sampling */ |
443 |
(*dobj_lightsamp)(c, d, p); |
444 |
return; |
445 |
} |
446 |
#endif |
447 |
odSample(c, d, p); /* add to display representation */ |
448 |
if (!--rayqleft) |
449 |
dev_flush(); /* flush output */ |
450 |
} |
451 |
|
452 |
|
453 |
int |
454 |
dev_flush() /* flush output as appropriate */ |
455 |
{ |
456 |
int ndrawn; |
457 |
|
458 |
if ((viewflags&(VWMAPPED|VWPERSP)) == (VWMAPPED|VWPERSP)) { |
459 |
#ifdef STEREO |
460 |
pushright(); /* draw right eye */ |
461 |
ndrawn = gmDrawGeom(); |
462 |
#ifdef DOBJ |
463 |
ndrawn += dobj_render(); |
464 |
#endif |
465 |
if (ndrawn) |
466 |
doportals(); |
467 |
checkglerr("rendering right eye"); |
468 |
popright(); /* draw left eye */ |
469 |
#endif |
470 |
ndrawn = gmDrawGeom(); |
471 |
#ifdef DOBJ |
472 |
ndrawn += dobj_render(); |
473 |
#endif |
474 |
if (ndrawn) |
475 |
doportals(); |
476 |
glXSwapBuffers(ourdisplay, gwind); |
477 |
checkglerr("rendering base view"); |
478 |
} |
479 |
if ((viewflags&(VWMAPPED|VWSTEADY|VWPERSP|VWORTHO)) == |
480 |
(VWMAPPED|VWSTEADY|VWPERSP)) { |
481 |
/* first time after steady */ |
482 |
if (ndrawn) |
483 |
xferdepth(); /* transfer and clear depth */ |
484 |
setglortho(); /* set orthographic view */ |
485 |
|
486 |
} |
487 |
if ((viewflags&(VWMAPPED|VWSTEADY|VWPERSP|VWORTHO)) == |
488 |
(VWMAPPED|VWSTEADY|VWORTHO)) { |
489 |
/* else update cones */ |
490 |
#ifdef STEREO |
491 |
pushright(); |
492 |
odUpdate(1); /* draw right eye */ |
493 |
popright(); |
494 |
#endif |
495 |
odUpdate(0); /* draw left eye */ |
496 |
glFlush(); /* flush OpenGL */ |
497 |
} |
498 |
rayqleft = RAYQLEN; |
499 |
/* flush X11 and return # pending */ |
500 |
return(odev.inpready = XPending(ourdisplay)); |
501 |
} |
502 |
|
503 |
|
504 |
checkglerr(where) /* check for GL or GLU error */ |
505 |
char *where; |
506 |
{ |
507 |
register GLenum errcode; |
508 |
|
509 |
while ((errcode = glGetError()) != GL_NO_ERROR) { |
510 |
sprintf(errmsg, "OpenGL error %s: %s", |
511 |
where, gluErrorString(errcode)); |
512 |
error(WARNING, errmsg); |
513 |
} |
514 |
} |
515 |
|
516 |
|
517 |
static |
518 |
xferdepth() /* load and clear depth buffer */ |
519 |
{ |
520 |
register GLfloat *dbp; |
521 |
register GLubyte *cbuf; |
522 |
|
523 |
if (depthbuffer == NULL) { /* allocate private depth buffer */ |
524 |
#ifdef STEREO |
525 |
depthright = (GLfloat *)malloc( |
526 |
odev.hres*odev.vres*sizeof(GLfloat)); |
527 |
#endif |
528 |
depthbuffer = (GLfloat *)malloc( |
529 |
odev.hres*odev.vres*sizeof(GLfloat)); |
530 |
CHECK(depthbuffer==NULL, SYSTEM, "out of memory in xferdepth"); |
531 |
} |
532 |
/* allocate alpha buffer for portals */ |
533 |
if (gmPortals) |
534 |
cbuf = (GLubyte *)malloc(odev.hres*odev.vres * |
535 |
(4*sizeof(GLubyte))); |
536 |
else |
537 |
cbuf = NULL; |
538 |
#ifdef STEREO |
539 |
setstereobuf(STEREO_BUFFER_RIGHT); |
540 |
glReadPixels(0, 0, odev.hres, odev.vres, |
541 |
GL_DEPTH_COMPONENT, GL_FLOAT, depthright); |
542 |
if (cbuf != NULL) |
543 |
glReadPixels(0, 0, odev.hres, odev.vres, |
544 |
GL_RGBA, GL_UNSIGNED_BYTE, cbuf); |
545 |
for (dbp = depthright + odev.hres*odev.vres; dbp-- > depthright; ) |
546 |
if (cbuf != NULL && isportal(cbuf+4*(dbp-depthright))) |
547 |
*dbp = FHUGE; |
548 |
else |
549 |
*dbp = mapdepth(*dbp); |
550 |
glClear(GL_DEPTH_BUFFER_BIT); |
551 |
setstereobuf(STEREO_BUFFER_LEFT); |
552 |
odDepthMap(1, depthright); |
553 |
#endif |
554 |
/* read back depth buffer */ |
555 |
glReadPixels(0, 0, odev.hres, odev.vres, |
556 |
GL_DEPTH_COMPONENT, GL_FLOAT, depthbuffer); |
557 |
if (cbuf != NULL) |
558 |
glReadPixels(0, 0, odev.hres, odev.vres, |
559 |
GL_RGBA, GL_UNSIGNED_BYTE, cbuf); |
560 |
for (dbp = depthbuffer + odev.hres*odev.vres; dbp-- > depthbuffer; ) |
561 |
if (cbuf != NULL && isportal(cbuf+4*(dbp-depthbuffer))) |
562 |
*dbp = FHUGE; |
563 |
else |
564 |
*dbp = mapdepth(*dbp); |
565 |
glClear(GL_DEPTH_BUFFER_BIT); /* clear system depth buffer */ |
566 |
if (cbuf != NULL) |
567 |
free((char *)cbuf); /* free our color buffer */ |
568 |
odDepthMap(0, depthbuffer); /* transfer depth data */ |
569 |
} |
570 |
|
571 |
|
572 |
static |
573 |
freedepth() /* free recorded depth buffer */ |
574 |
{ |
575 |
if (depthbuffer == NULL) |
576 |
return; |
577 |
#ifdef STEREO |
578 |
odDepthMap(1, NULL); |
579 |
free((char *)depthright); |
580 |
depthright = NULL; |
581 |
#endif |
582 |
odDepthMap(0, NULL); |
583 |
free((char *)depthbuffer); |
584 |
depthbuffer = NULL; |
585 |
} |
586 |
|
587 |
|
588 |
static double |
589 |
getdistance(dx, dy, direc) /* distance from fore plane along view ray */ |
590 |
int dx, dy; |
591 |
FVECT direc; |
592 |
{ |
593 |
GLfloat gldepth; |
594 |
GLubyte glcolor[4]; |
595 |
double dist; |
596 |
|
597 |
if (dx<0 | dx>=odev.hres | dy<0 | dy>=odev.vres) |
598 |
return(FHUGE); |
599 |
if (depthbuffer != NULL) |
600 |
dist = depthbuffer[dy*odev.hres + dx]; |
601 |
else { |
602 |
glReadPixels(dx,dy, 1,1, GL_DEPTH_COMPONENT, |
603 |
GL_FLOAT, &gldepth); |
604 |
if (gmPortals) { |
605 |
glReadPixels(dx,dy, 1,1, GL_RGBA, |
606 |
GL_UNSIGNED_BYTE, glcolor); |
607 |
if (isportal(glcolor)) |
608 |
return(FHUGE); |
609 |
} |
610 |
dist = mapdepth(gldepth); |
611 |
} |
612 |
if (dist >= .99*FHUGE) |
613 |
return(FHUGE); |
614 |
return((dist-odev.v.vfore)/DOT(direc,odev.v.vdir)); |
615 |
} |
616 |
|
617 |
|
618 |
#ifdef STEREO |
619 |
static |
620 |
pushright() /* push on right view & buffer */ |
621 |
{ |
622 |
double d; |
623 |
|
624 |
setstereobuf(STEREO_BUFFER_RIGHT); |
625 |
if (viewflags & VWPERSP) { |
626 |
glMatrixMode(GL_MODELVIEW); |
627 |
glPushMatrix(); |
628 |
d = -eyesepdist / sqrt(odev.v.hn2); |
629 |
glTranslated(d*odev.v.hvec[0], d*odev.v.hvec[1], |
630 |
d*odev.v.hvec[2]); |
631 |
checkglerr("setting right view"); |
632 |
} |
633 |
} |
634 |
|
635 |
|
636 |
static |
637 |
popright() /* pop off right view & buffer */ |
638 |
{ |
639 |
if (viewflags & VWPERSP) { |
640 |
glMatrixMode(GL_MODELVIEW); |
641 |
glPopMatrix(); |
642 |
} |
643 |
setstereobuf(STEREO_BUFFER_LEFT); |
644 |
} |
645 |
#endif |
646 |
|
647 |
|
648 |
static int |
649 |
mytmflags() /* figure out tone mapping flags */ |
650 |
{ |
651 |
extern char *progname; |
652 |
register char *cp, *tail; |
653 |
/* find basic name */ |
654 |
for (cp = tail = progname; *cp; cp++) |
655 |
if (*cp == '/') |
656 |
tail = cp+1; |
657 |
for (cp = tail; *cp && *cp != '.'; cp++) |
658 |
; |
659 |
#ifdef DEBUG |
660 |
if (cp > tail && cp[-1] == 'h') |
661 |
return(TM_F_HUMAN); |
662 |
else |
663 |
return(TM_F_CAMERA); |
664 |
#else |
665 |
if (cp > tail && cp[-1] == 'h') |
666 |
return(TM_F_HUMAN|TM_F_NOSTDERR); |
667 |
else |
668 |
return(TM_F_CAMERA|TM_F_NOSTDERR); |
669 |
#endif |
670 |
} |
671 |
|
672 |
|
673 |
static |
674 |
getevent() /* get next event */ |
675 |
{ |
676 |
XNextEvent(ourdisplay, levptr(XEvent)); |
677 |
switch (levptr(XEvent)->type) { |
678 |
case ConfigureNotify: |
679 |
resizewindow(levptr(XConfigureEvent)); |
680 |
break; |
681 |
case UnmapNotify: |
682 |
viewflags &= ~VWMAPPED; |
683 |
break; |
684 |
case MapNotify: |
685 |
odRemap(0); |
686 |
viewflags |= VWMAPPED; |
687 |
break; |
688 |
case Expose: |
689 |
fixwindow(levptr(XExposeEvent)); |
690 |
break; |
691 |
case KeyPress: |
692 |
getkey(levptr(XKeyPressedEvent)); |
693 |
break; |
694 |
case ButtonPress: |
695 |
if (FRAMESTATE(levptr(XButtonPressedEvent)->state)) |
696 |
getframe(levptr(XButtonPressedEvent)); |
697 |
else |
698 |
getmove(levptr(XButtonPressedEvent)); |
699 |
break; |
700 |
} |
701 |
} |
702 |
|
703 |
|
704 |
static |
705 |
draw3dline(wp) /* draw 3d line in world coordinates */ |
706 |
register FVECT wp[2]; |
707 |
{ |
708 |
glVertex3d(wp[0][0], wp[0][1], wp[0][2]); |
709 |
glVertex3d(wp[1][0], wp[1][1], wp[1][2]); |
710 |
} |
711 |
|
712 |
|
713 |
static |
714 |
draw_grids(fore) /* draw holodeck section grids */ |
715 |
int fore; |
716 |
{ |
717 |
glPushAttrib(GL_LIGHTING_BIT|GL_ENABLE_BIT); |
718 |
glDisable(GL_LIGHTING); |
719 |
if (fore) |
720 |
glColor3ub(4, 250, 250); |
721 |
else |
722 |
glColor3ub(0, 0, 0); |
723 |
glBegin(GL_LINES); /* draw each grid line */ |
724 |
gridlines(draw3dline); |
725 |
glEnd(); |
726 |
checkglerr("drawing grid lines"); |
727 |
glPopAttrib(); |
728 |
} |
729 |
|
730 |
|
731 |
static |
732 |
moveview(dx, dy, mov, orb) /* move our view */ |
733 |
int dx, dy, mov, orb; |
734 |
{ |
735 |
VIEW nv; |
736 |
FVECT odir, v1, wip; |
737 |
double d, d1; |
738 |
register int li; |
739 |
/* start with old view */ |
740 |
copystruct(&nv, &odev.v); |
741 |
/* orient our motion */ |
742 |
if (viewray(v1, odir, &odev.v, |
743 |
(dx+.5)/odev.hres, (dy+.5)/odev.vres) < -FTINY) |
744 |
return(0); /* outside view */ |
745 |
if (mov | orb) { /* moving relative to geometry */ |
746 |
d = getdistance(dx, dy, odir); /* distance from front plane */ |
747 |
#ifdef DOBJ |
748 |
d1 = dobj_trace(NULL, v1, odir); |
749 |
if (d1 < d) |
750 |
d = d1; |
751 |
#endif |
752 |
if (d >= .99*FHUGE) |
753 |
d = 0.5*(dev_zmax+dev_zmin); /* just guess */ |
754 |
VSUM(wip, v1, odir, d); |
755 |
VSUB(odir, wip, odev.v.vp); |
756 |
} else /* panning with constant viewpoint */ |
757 |
VCOPY(nv.vdir, odir); |
758 |
if (orb && mov) { /* orbit left/right */ |
759 |
spinvector(odir, odir, nv.vup, d=MOVDEG*PI/180.*mov); |
760 |
VSUM(nv.vp, wip, odir, -1.); |
761 |
spinvector(nv.vdir, nv.vdir, nv.vup, d); |
762 |
} else if (orb) { /* orbit up/down */ |
763 |
fcross(v1, odir, nv.vup); |
764 |
if (normalize(v1) == 0.) |
765 |
return(0); |
766 |
spinvector(odir, odir, v1, d=MOVDEG*PI/180.*orb); |
767 |
VSUM(nv.vp, wip, odir, -1.); |
768 |
spinvector(nv.vdir, nv.vdir, v1, d); |
769 |
} else if (mov) { /* move forward/backward */ |
770 |
d = MOVPCT/100. * mov; |
771 |
VSUM(nv.vp, nv.vp, odir, d); |
772 |
} |
773 |
if (!mov ^ !orb && viewflags&VWHEADLOCK) { /* restore height */ |
774 |
VSUM(v1, odev.v.vp, nv.vp, -1.); |
775 |
d = DOT(v1, nv.vup); |
776 |
VSUM(nv.vp, nv.vp, odev.v.vup, d); |
777 |
} |
778 |
if (setview(&nv) != NULL) |
779 |
return(0); /* illegal view */ |
780 |
dev_view(&nv); |
781 |
inpresflags |= DFL(DC_SETVIEW); |
782 |
return(1); |
783 |
} |
784 |
|
785 |
|
786 |
static |
787 |
getframe(ebut) /* get focus frame */ |
788 |
XButtonPressedEvent *ebut; |
789 |
{ |
790 |
int startx = ebut->x, starty = ebut->y; |
791 |
int endx, endy; |
792 |
|
793 |
XMaskEvent(ourdisplay, ButtonReleaseMask, levptr(XEvent)); |
794 |
endx = levptr(XButtonReleasedEvent)->x; |
795 |
endy = levptr(XButtonReleasedEvent)->y; |
796 |
if (endx == startx | endy == starty) { |
797 |
XBell(ourdisplay, 0); |
798 |
return; |
799 |
} |
800 |
if (endx < startx) {register int c = endx; endx = startx; startx = c;} |
801 |
if (endy < starty) {register int c = endy; endy = starty; starty = c;} |
802 |
sprintf(odev_args, "%.3f %.3f %.3f %.3f", |
803 |
(startx+.5)/odev.hres, 1.-(endy+.5)/odev.vres, |
804 |
(endx+.5)/odev.hres, 1.-(starty+.5)/odev.vres); |
805 |
inpresflags |= DFL(DC_FOCUS); |
806 |
} |
807 |
|
808 |
|
809 |
static |
810 |
getmove(ebut) /* get view change */ |
811 |
XButtonPressedEvent *ebut; |
812 |
{ |
813 |
int movdir = MOVDIR(ebut->button); |
814 |
int movorb = MOVORB(ebut->state); |
815 |
int ndrawn; |
816 |
Window rootw, childw; |
817 |
int rootx, rooty, wx, wy; |
818 |
unsigned int statemask; |
819 |
|
820 |
XNoOp(ourdisplay); /* makes sure we're not idle */ |
821 |
|
822 |
viewflags &= ~VWSTEADY; /* flag moving view */ |
823 |
setglpersp(&odev.v); /* start us off in perspective */ |
824 |
while (!XCheckMaskEvent(ourdisplay, |
825 |
ButtonReleaseMask, levptr(XEvent))) { |
826 |
/* get cursor position */ |
827 |
if (!XQueryPointer(ourdisplay, gwind, &rootw, &childw, |
828 |
&rootx, &rooty, &wx, &wy, &statemask)) |
829 |
break; /* on another screen */ |
830 |
/* compute view motion */ |
831 |
if (!moveview(wx, odev.vres-1-wy, movdir, movorb)) { |
832 |
sleep(1); |
833 |
continue; /* cursor in bad place */ |
834 |
} |
835 |
draw_grids(1); /* redraw grid */ |
836 |
#ifdef STEREO |
837 |
pushright(); |
838 |
draw_grids(1); |
839 |
ndrawn = gmDrawGeom(); |
840 |
#ifdef DOBJ |
841 |
ndrawn += dobj_render(); |
842 |
#endif |
843 |
if (ndrawn) |
844 |
doportals(); |
845 |
popright(); |
846 |
#endif |
847 |
/* redraw octrees */ |
848 |
ndrawn = gmDrawGeom(); |
849 |
#ifdef DOBJ |
850 |
ndrawn += dobj_render(); /* redraw objects */ |
851 |
#endif |
852 |
if (ndrawn) |
853 |
doportals(); |
854 |
glXSwapBuffers(ourdisplay, gwind); |
855 |
if (!ndrawn) |
856 |
sleep(1); /* for reasonable interaction */ |
857 |
} |
858 |
if (!(inpresflags & DFL(DC_SETVIEW))) { /* do final motion */ |
859 |
movdir = MOVDIR(levptr(XButtonReleasedEvent)->button); |
860 |
wx = levptr(XButtonReleasedEvent)->x; |
861 |
wy = levptr(XButtonReleasedEvent)->y; |
862 |
moveview(wx, odev.vres-1-wy, movdir, movorb); |
863 |
} |
864 |
viewflags |= VWSTEADY; /* done goofing around */ |
865 |
} |
866 |
|
867 |
|
868 |
static |
869 |
setglpersp(vp) /* set perspective view in GL */ |
870 |
register VIEW *vp; |
871 |
{ |
872 |
double d, xmin, xmax, ymin, ymax; |
873 |
GLfloat vec[4]; |
874 |
double depthlim[2]; |
875 |
/* set depth limits */ |
876 |
gmDepthLimit(depthlim, odev.v.vp, odev.v.vdir); |
877 |
if (depthlim[0] >= depthlim[1]) { |
878 |
dev_zmin = 1.; |
879 |
dev_zmax = 100.; |
880 |
} else { |
881 |
dev_zmin = 0.5*depthlim[0]; |
882 |
dev_zmax = 1.75*depthlim[1]; |
883 |
if (dev_zmin > dev_zmax/5.) |
884 |
dev_zmin = dev_zmax/5.; |
885 |
} |
886 |
if (odev.v.vfore > FTINY) |
887 |
dev_zmin = odev.v.vfore; |
888 |
if (odev.v.vaft > FTINY) |
889 |
dev_zmax = odev.v.vaft; |
890 |
if (dev_zmin < dev_zmax/100.) |
891 |
dev_zmin = dev_zmax/100.; |
892 |
setzrat(); |
893 |
xmax = dev_zmin * tan(PI/180./2. * odev.v.horiz); |
894 |
xmin = -xmax; |
895 |
d = odev.v.hoff * (xmax - xmin); |
896 |
xmin += d; xmax += d; |
897 |
ymax = dev_zmin * tan(PI/180./2. * odev.v.vert); |
898 |
ymin = -ymax; |
899 |
d = odev.v.voff * (ymax - ymin); |
900 |
ymin += d; ymax += d; |
901 |
/* set view matrix */ |
902 |
glMatrixMode(GL_PROJECTION); |
903 |
glLoadIdentity(); |
904 |
glFrustum(xmin, xmax, ymin, ymax, dev_zmin, dev_zmax); |
905 |
gluLookAt(odev.v.vp[0], odev.v.vp[1], odev.v.vp[2], |
906 |
odev.v.vp[0] + odev.v.vdir[0], |
907 |
odev.v.vp[1] + odev.v.vdir[1], |
908 |
odev.v.vp[2] + odev.v.vdir[2], |
909 |
odev.v.vup[0], odev.v.vup[1], odev.v.vup[2]); |
910 |
checkglerr("setting perspective view"); |
911 |
vec[0] = vec[1] = vec[2] = 0.; vec[3] = 1.; |
912 |
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, vec); |
913 |
vec[0] = -odev.v.vdir[0]; |
914 |
vec[1] = -odev.v.vdir[1]; |
915 |
vec[2] = -odev.v.vdir[2]; |
916 |
vec[3] = 0.; |
917 |
glLightfv(GL_LIGHT0, GL_POSITION, vec); |
918 |
vec[0] = vec[1] = vec[2] = .7; vec[3] = 1.; |
919 |
glLightfv(GL_LIGHT0, GL_SPECULAR, vec); |
920 |
glLightfv(GL_LIGHT0, GL_DIFFUSE, vec); |
921 |
vec[0] = vec[1] = vec[2] = .3; vec[3] = 1.; |
922 |
glLightfv(GL_LIGHT0, GL_AMBIENT, vec); |
923 |
glEnable(GL_LIGHT0); |
924 |
glEnable(GL_LIGHTING); /* light our GL objects */ |
925 |
glShadeModel(GL_SMOOTH); |
926 |
viewflags &= ~VWORTHO; |
927 |
viewflags |= VWPERSP; |
928 |
} |
929 |
|
930 |
|
931 |
static |
932 |
setglortho() /* set up orthographic view for cone drawing */ |
933 |
{ |
934 |
glDrawBuffer(GL_FRONT); /* use single-buffer mode */ |
935 |
/* set view matrix */ |
936 |
glMatrixMode(GL_PROJECTION); |
937 |
glLoadIdentity(); |
938 |
glOrtho(0., (double)odev.hres, 0., (double)odev.vres, |
939 |
0.001*OMAXDEPTH, 1.001*(-OMAXDEPTH)); |
940 |
checkglerr("setting orthographic view"); |
941 |
glDisable(GL_LIGHTING); /* cones are constant color */ |
942 |
glShadeModel(GL_FLAT); |
943 |
viewflags &= ~VWPERSP; |
944 |
viewflags |= VWORTHO; |
945 |
} |
946 |
|
947 |
|
948 |
static |
949 |
wipeclean() /* prepare for redraw */ |
950 |
{ |
951 |
glDrawBuffer(GL_BACK); /* use double-buffer mode */ |
952 |
glReadBuffer(GL_FRONT); /* read back visible contents */ |
953 |
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); |
954 |
/* clear buffers */ |
955 |
#ifdef STEREO |
956 |
setstereobuf(STEREO_BUFFER_RIGHT); |
957 |
glClear(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT); |
958 |
setstereobuf(STEREO_BUFFER_LEFT); |
959 |
#endif |
960 |
glClear(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT); |
961 |
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE); |
962 |
freedepth(); |
963 |
if ((viewflags&(VWCHANGE|VWSTEADY)) == |
964 |
(VWCHANGE|VWSTEADY)) { /* clear samples if new */ |
965 |
odClean(); |
966 |
viewflags &= ~VWCHANGE; /* change noted */ |
967 |
} |
968 |
setglpersp(&odev.v); /* reset view & clipping planes */ |
969 |
} |
970 |
|
971 |
|
972 |
static |
973 |
getkey(ekey) /* get input key */ |
974 |
register XKeyPressedEvent *ekey; |
975 |
{ |
976 |
Window rootw, childw; |
977 |
int rootx, rooty, wx, wy; |
978 |
unsigned int statemask; |
979 |
int n; |
980 |
char buf[8]; |
981 |
|
982 |
n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL); |
983 |
if (n != 1) |
984 |
return; |
985 |
switch (buf[0]) { |
986 |
case 'h': /* turn on height motion lock */ |
987 |
viewflags |= VWHEADLOCK; |
988 |
return; |
989 |
case 'H': /* turn off height motion lock */ |
990 |
viewflags &= ~VWHEADLOCK; |
991 |
return; |
992 |
case 'l': /* retrieve last view */ |
993 |
inpresflags |= DFL(DC_LASTVIEW); |
994 |
return; |
995 |
case 'p': /* pause computation */ |
996 |
inpresflags |= DFL(DC_PAUSE); |
997 |
return; |
998 |
case 'v': /* spit out view */ |
999 |
inpresflags |= DFL(DC_GETVIEW); |
1000 |
return; |
1001 |
case 'f': /* frame view position */ |
1002 |
if (!XQueryPointer(ourdisplay, gwind, &rootw, &childw, |
1003 |
&rootx, &rooty, &wx, &wy, &statemask)) |
1004 |
return; /* on another screen */ |
1005 |
sprintf(odev_args, "%.4f %.4f", (wx+.5)/odev.hres, |
1006 |
1.-(wy+.5)/odev.vres); |
1007 |
inpresflags |= DFL(DC_FOCUS); |
1008 |
return; |
1009 |
case 'F': /* unfocus */ |
1010 |
odev_args[0] = '\0'; |
1011 |
inpresflags |= DFL(DC_FOCUS); |
1012 |
return; |
1013 |
case '\n': |
1014 |
case '\r': /* resume computation */ |
1015 |
inpresflags |= DFL(DC_RESUME); |
1016 |
return; |
1017 |
case CTRL('R'): /* redraw screen */ |
1018 |
odRemap(0); |
1019 |
glClear(GL_DEPTH_BUFFER_BIT); |
1020 |
#ifdef STEREO |
1021 |
setstereobuf(STEREO_BUFFER_RIGHT); |
1022 |
glClear(GL_DEPTH_BUFFER_BIT); |
1023 |
setstereobuf(STEREO_BUFFER_LEFT); |
1024 |
#endif |
1025 |
return; |
1026 |
case CTRL('L'): /* refresh from server */ |
1027 |
if (inpresflags & DFL(DC_REDRAW)) |
1028 |
return; |
1029 |
XRaiseWindow(ourdisplay, gwind); |
1030 |
XFlush(ourdisplay); |
1031 |
sleep(1); |
1032 |
wipeclean(); /* fresh display */ |
1033 |
odRemap(1); /* fresh tone mapping */ |
1034 |
dev_flush(); /* draw octrees */ |
1035 |
inpresflags |= DFL(DC_REDRAW); /* resend values from server */ |
1036 |
rayqleft = 0; /* hold off update */ |
1037 |
return; |
1038 |
case 'K': /* kill rtrace process(es) */ |
1039 |
inpresflags |= DFL(DC_KILL); |
1040 |
break; |
1041 |
case 'R': /* restart rtrace */ |
1042 |
inpresflags |= DFL(DC_RESTART); |
1043 |
break; |
1044 |
case 'C': /* clobber holodeck */ |
1045 |
inpresflags |= DFL(DC_CLOBBER); |
1046 |
break; |
1047 |
case 'q': /* quit the program */ |
1048 |
inpresflags |= DFL(DC_QUIT); |
1049 |
return; |
1050 |
default: |
1051 |
XBell(ourdisplay, 0); |
1052 |
return; |
1053 |
} |
1054 |
} |
1055 |
|
1056 |
|
1057 |
static |
1058 |
fixwindow(eexp) /* repair damage to window */ |
1059 |
register XExposeEvent *eexp; |
1060 |
{ |
1061 |
int xmin, ymin, xmax, ymax; |
1062 |
|
1063 |
if (odev.hres == 0 | odev.vres == 0) { /* first exposure */ |
1064 |
resizewindow((XConfigureEvent *)eexp); |
1065 |
return; |
1066 |
} |
1067 |
xmin = eexp->x; xmax = eexp->x + eexp->width; |
1068 |
ymin = odev.vres - eexp->y - eexp->height; ymax = odev.vres - eexp->y; |
1069 |
/* clear portion of depth */ |
1070 |
glPushAttrib(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT); |
1071 |
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); |
1072 |
glDepthFunc(GL_ALWAYS); |
1073 |
glBegin(GL_POLYGON); |
1074 |
glVertex3i(xmin, ymin, OMAXDEPTH); |
1075 |
glVertex3i(xmax, ymin, OMAXDEPTH); |
1076 |
glVertex3i(xmax, ymax, OMAXDEPTH); |
1077 |
glVertex3i(xmin, ymax, OMAXDEPTH); |
1078 |
glEnd(); |
1079 |
#ifdef STEREO |
1080 |
setstereobuf(STEREO_BUFFER_RIGHT); |
1081 |
glBegin(GL_POLYGON); |
1082 |
glVertex3i(xmin, ymin, OMAXDEPTH); |
1083 |
glVertex3i(xmax, ymin, OMAXDEPTH); |
1084 |
glVertex3i(xmax, ymax, OMAXDEPTH); |
1085 |
glVertex3i(xmin, ymax, OMAXDEPTH); |
1086 |
glEnd(); |
1087 |
odRedraw(1, xmin, ymin, xmax, ymax); |
1088 |
setstereobuf(STEREO_BUFFER_LEFT); |
1089 |
#endif |
1090 |
glPopAttrib(); |
1091 |
odRedraw(0, xmin, ymin, xmax, ymax); |
1092 |
} |
1093 |
|
1094 |
|
1095 |
static |
1096 |
resizewindow(ersz) /* resize window */ |
1097 |
register XConfigureEvent *ersz; |
1098 |
{ |
1099 |
glViewport(0, 0, ersz->width, ersz->height); |
1100 |
|
1101 |
if (ersz->width == odev.hres && ersz->height == odev.vres) |
1102 |
return; |
1103 |
|
1104 |
odev.hres = ersz->width; |
1105 |
odev.vres = ersz->height; |
1106 |
|
1107 |
odev.v.horiz = 2.*180./PI * atan(0.5/VIEWDIST*pwidth*odev.hres); |
1108 |
odev.v.vert = 2.*180./PI * atan(0.5/VIEWDIST*pheight*odev.vres); |
1109 |
|
1110 |
inpresflags |= DFL(DC_SETVIEW); |
1111 |
viewflags |= VWCHANGE; |
1112 |
} |