/*
* Copyright 1995, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
*
* This source code ("Source Code") was originally derived from a
* code base owned by Silicon Graphics, Inc. ("SGI")
*
* LICENSE: SGI grants the user ("Licensee") permission to reproduce,
* distribute, and create derivative works from this Source Code,
* provided that: (1) the user reproduces this entire notice within
* both source and binary format redistributions and any accompanying
* materials such as documentation in printed or electronic format;
* (2) the Source Code is not to be used, or ported or modified for
* use, except in conjunction with OpenGL Performer; and (3) the
* names of Silicon Graphics, Inc. and SGI may not be used in any
* advertising or publicity relating to the Source Code without the
* prior written permission of SGI. No further license or permission
* may be inferred or deemed or construed to exist with regard to the
* Source Code or the code base of which it forms a part. All rights
* not expressly granted are reserved.
*
* This Source Code is provided to Licensee AS IS, without any
* warranty of any kind, either express, implied, or statutory,
* including, but not limited to, any warranty that the Source Code
* will conform to specifications, any implied warranties of
* merchantability, fitness for a particular purpose, and freedom
* from infringement, and any warranty that the documentation will
* conform to the program, or any warranty that the Source Code will
* be error free.
*
* IN NO EVENT WILL SGI BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT
* LIMITED TO DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES,
* ARISING OUT OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THE
* SOURCE CODE, WHETHER OR NOT BASED UPON WARRANTY, CONTRACT, TORT OR
* OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
* PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM,
* OR AROSE OUT OF USE OR RESULTS FROM USE OF, OR LACK OF ABILITY TO
* USE, THE SOURCE CODE.
*
* Contact information: Silicon Graphics, Inc.,
* 1600 Amphitheatre Pkwy, Mountain View, CA 94043,
* or: http://www.sgi.com
*
* stereotb.c
*
* OpenGL Performer example showing how to do top/bottom (also known as
* full screen) stereo using a two channel group. This is the simplest
* way to implement stereo in performer. It has the performance overhead
* of pushing two channels through the culling phase.
*
* Please note that top/bottom stereo is slower than quad buffer "stereo
* in a window" and is not recommended for Performer applications. If you
* have a choice, use quad-buffer stereo. The advantage of top/bottom stereo
* is that it will work on low-end systems.
*
* This program allows the use to set the interocular spacing (distance
* between the "eyes" of the viewer), and the distance at which the object
* views fuse. This distance is where the image will appear to be in the
* plane of the screen. Closer objects will appear in front of the screen,
* more distant objects inside and behind it.
*
* Mouse and keyboard go through GL which is simpler than mixed
* model (GLX), but does incur some overhead in the draw process.
* X input handling is done in a forked event handling process.
*
* $Revision: 1.1 $
* $Date: 2000/11/21 21:39:37 $
*
* Command-line options:
* -b : norborder window
* -f : full screen
* -F : put X input handling in a forked process
* -m procsplit : multiprocess mode
* -w : write scene to file
* -i : interocular distance
*
* Run-time controls:
* ESC-key: exits
* F1-key: profile
* g key: toggle stats
* space key: reset object position
* Left-mouse: advance
* Middle-mouse: stop
* Right-mouse: retreat
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <signal.h> /* for sigset for forked X event handler process */
#include <getopt.h> /* for cmdline handler */
#include <X11/keysym.h>
#include <Performer/pf.h>
#include <Performer/pfutil.h>
#include <Performer/pfdu.h>
#include <X11/extensions/SGIStereo.h>
/*
* structure that resides in shared memory so that the
* application, cull, and draw processes can access it.
*/
typedef struct
{
pfPipeWindow *pw;
int exitFlag;
int inWindow, reset;
float mouseX, mouseY;
int winSizeX, winSizeY;
int mouseButtons;
pfCoord view, viewOrig;
float sceneSize;
float accelRate;
int drawStats;
int XInputInited;
} SharedData;
static SharedData *Shared;
/*
* APP process variables
*/
/* for configuring multi-process */
static int ProcSplit = PFMP_DEFAULT;
/* write out scene upon read-in - uses pfDebugPrint */
static int WriteScene = 0;
static int FullScreen = 0;
static int WinType = PFPWIN_TYPE_X;
static int NoBorder = 0;
static int ForkedXInput = 0;
static float Iod = 2.f;
static float Converge = .2f;
static float Fov = 45.f;
char ProgName[PF_MAXSTRING];
/* light source created and updated in DRAW-process */
static pfLight *Sun;
static void CullChannel(pfChannel *chan, void *data);
static void DrawChannel(pfChannel *chan, void *data);
static void OpenPipeWin(pfPipeWindow *pw);
static void UpdateView(void);
static void GetGLInput(void);
static void InitXInput(pfWSConnection dsp);
static void DoXInput(void);
static void GetXInput(Display *dsp);
static void Usage(void);
/*
* Usage() -- print usage advice and exit. This procedure
* is executed in the application process.
*/
static void
Usage (void)
{
pfNotify(PFNFY_FATAL, PFNFY_USAGE,
"Usage: %s [-m procSplit] [file.ext ...]\n", ProgName);
exit(1);
}
/*
* docmdline() -- use getopt to get command-line arguments,
* executed at the start of the application process.
*/
static int
docmdline(int argc, char *argv[])
{
int opt;
strcpy(ProgName, argv[0]);
/* process command-line arguments */
while ((opt = getopt(argc, argv, "fFbm:wxp:i:?v:c:")) != -1)
{
switch (opt)
{
case 'f':
FullScreen = 1;
break;
case 'F':
ForkedXInput = 1;
break;
case 'm':
case 'p':
ProcSplit = atoi(optarg);
break;
case 'w':
WriteScene = 1;
break;
case 'x':
WinType &= ~(PFPWIN_TYPE_X);
break;
case 'b':
NoBorder ^= 1;
break;
case 'i': /* get interocular distance */
Iod = atof(optarg);
break;
case 'v': /* get field of view */
Fov = atof(optarg);
break;
case 'c': /* set convergence ratio */
Converge = atof(optarg);
break;
case '?':
Usage();
}
}
return optind;
}
/*
* main() -- program entry point. this procedure
* is executed in the application process.
*/
int
main (int argc, char *argv[])
{
int arg;
int found;
unsigned int mask;
pfNode *root;
pfChannel *left, *right;
pfScene *scene;
pfPipe *p;
pfPipeWindow *pw;
pfEarthSky *eSky;
pfBox bbox;
float far = 10000.0f;
float near = .1f;
pfWSConnection dsp=NULL;
pfVec3 xyzOffsets;
pfVec3 hprOffsets;
int *leftArg, *rightArg;
float halfNearWidth;
float eyeAngle;
arg = docmdline(argc, argv);
pfInit();
/* configure multi-process selection */
pfMultiprocess(ProcSplit);
/* allocate shared before fork()'ing parallel processes */
Shared = (SharedData*)pfMalloc(sizeof(SharedData), pfGetSharedArena());
Shared->inWindow = 0;
Shared->reset = 0;
Shared->exitFlag = 0;
Shared->drawStats = 1;
Shared->XInputInited = 0;
/* Load all loader DSO's before pfConfig() forks */
for (found = arg; found < argc; found++)
pfdInitConverter(argv[found]);
/* initiate multi-processing mode set in pfMultiprocess call
* FORKs for Performer processes, CULL and DRAW, etc. happen here.
*/
pfConfig();
/* configure pipes and windows */
p = pfGetPipe(0);
Shared->pw = pfNewPWin(p);
pfPWinName(Shared->pw, "OpenGL Performer");
pfPWinType(Shared->pw, WinType);
if (NoBorder)
pfPWinMode(Shared->pw, PFWIN_NOBORDER, 1);
/* Open and configure the GL window. */
pfPWinConfigFunc(Shared->pw, OpenPipeWin);
pfConfigPWin(Shared->pw);
if (FullScreen)
pfPWinFullScreen(Shared->pw);
else
pfPWinOriginSize(Shared->pw, 0, 0, 600, 300);
/* set off the draw process to open windows and call init callbacks */
pfFrame();
/* specify directories where geometry and textures exist */
if (!(getenv("PFPATH")))
pfFilePath(
"."
":./data"
":../data"
":../../data"
":../../../../data"
":/usr/share/Performer/data"
);
pfNotify(PFNFY_INFO, PFNFY_PRINT,"FilePath: %s\n", pfGetFilePath());
/* load files named by command line arguments */
scene = pfNewScene();
for (found = 0; arg < argc; arg++)
{
if ((root = pfdLoadFile(argv[arg])) != NULL)
{
pfAddChild(scene, root);
found++;
}
}
/* if no files successfully loaded, terminate program */
#if 0
if (!found)
Usage();
#endif
/* Write out nodes in scene (for debugging) */
if (WriteScene)
{
FILE *fp;
if (fp = fopen("scene.out", "w"))
{
pfPrint(scene, PFTRAV_SELF|PFTRAV_DESCEND, PFPRINT_VB_DEBUG, fp);
fclose(fp);
}
else
pfNotify(PFNFY_WARN, PFNFY_RESOURCE,
"Could not open scene.out for debug printing.");
}
pfNotify(PFNFY_NOTICE, PFNFY_PRINT, "Using OpenGL to swap buffers\n");
/* determine extent of scene's geometry */
pfuTravCalcBBox(scene, &bbox);
pfFrameRate(30.0f);
pfPhase(PFPHASE_FREE_RUN);
/* create a channel for each eye */
left = pfNewChan(p);
right = pfNewChan(p);
pfAttachChan(left, right);
mask = pfGetChanShare(left);
/* same viewport */
mask |= PFCHAN_VIEWPORT;
pfChanShare(left, mask);
pfChanTravFunc(left, PFTRAV_CULL, CullChannel);
pfChanTravFunc(left, PFTRAV_DRAW, DrawChannel);
pfChanScene(left, scene);
pfChanNearFar(left, near, far);
/* set up data to distinguish between left and right eye */
leftArg = (int *)pfAllocChanData(left, sizeof(int));
rightArg = (int *)pfAllocChanData(right, sizeof(int));
*leftArg = 1;
*rightArg = 0;
/* data never changes, so we only need to pass it once */
pfPassChanData(left);
pfPassChanData(right);
pfChanFOV(left, 45.f, -1.f);
/* set up offsets for left and right channels for stereo viewing */
/* both eyes look at same spot 1/2 way between eyes at fusion distance */
eyeAngle = PF_RAD2DEG(
atanf(Iod *.5f /(Converge * (far - near) + near)));
/* left eye */
pfSetVec3(hprOffsets, -eyeAngle, 0.f, 0.f);
pfSetVec3(xyzOffsets, -Iod/2.f, 0.f, 0.f);
pfChanViewOffsets(left, xyzOffsets, hprOffsets);
/* right eye */
pfSetVec3(hprOffsets, eyeAngle, 0.f, 0.f);
pfSetVec3(xyzOffsets, Iod/2.f, 0.f, 0.f);
pfChanViewOffsets(right, xyzOffsets, hprOffsets);
/* Create an earth/sky model that draws sky/ground/horizon */
eSky = pfNewESky();
pfESkyMode(eSky, PFES_BUFFER_CLEAR, PFES_SKY_GRND);
pfESkyAttr(eSky, PFES_GRND_HT, -10.0f);
pfChanESky(left, eSky);
pfChanTravMode(left, PFTRAV_CULL, PFCULL_ALL);
if (found)
{
float sceneSize;
/* Set initial view to be "in front" of scene */
/* view point at center of bbox */
pfAddVec3(Shared->view.xyz, bbox.min, bbox.max);
pfScaleVec3(Shared->view.xyz, 0.5f, Shared->view.xyz);
/* find max dimension */
sceneSize = bbox.max[PF_X] - bbox.min[PF_X];
sceneSize = PF_MAX2(sceneSize, bbox.max[PF_Y] - bbox.min[PF_Y]);
sceneSize = PF_MAX2(sceneSize, bbox.max[PF_Z] - bbox.min[PF_Z]);
sceneSize = PF_MIN2(sceneSize, 0.5f * far);
Shared->sceneSize = sceneSize;
/* offset so all is visible */
Shared->view.xyz[PF_Y] -= sceneSize;
Shared->view.xyz[PF_Z] += 0.25f*sceneSize;
} else
{
pfSetVec3(Shared->view.xyz, 0.0f, 0.0f, 100.0f);
PFSET_VEC3(bbox.min, -5000.0, -5000.0, -1000000.0);
PFSET_VEC3(bbox.max, 5000.0, 5000.0, 10000000.0);
Shared->sceneSize = 10000.0f;
}
pfSetVec3(Shared->view.hpr, 0.0f, 0.0f, 0.0f);
pfChanView(left, Shared->view.xyz, Shared->view.hpr);
PFCOPY_VEC3(Shared->viewOrig.xyz, Shared->view.xyz);
PFCOPY_VEC3(Shared->viewOrig.hpr, Shared->view.hpr);
/* create forked XInput handling process
* since the Shared pointer has already been initialized, that structure
* will be visible to the XInput process. Nothing else created in the
* application after this fork whose handles are not put in shared memory
* (such as the database and channels) will be visible to the
* XInput process.
*/
if (WinType & PFPWIN_TYPE_X)
{
pid_t fpid = 0;
if (ForkedXInput)
{
if ((fpid = fork()) < 0)
pfNotify(PFNFY_FATAL, PFNFY_SYSERR, "Fork of XInput process failed.");
else if (fpid)
pfNotify(PFNFY_NOTICE,PFNFY_PRINT,"XInput running in forked process %d",
fpid);
if (!fpid)
DoXInput();
}
else
{
dsp = pfGetCurWSConnection();
}
}
/* main simulation loop */
while (!Shared->exitFlag)
{
/* wait until next frame boundary */
pfSync();
/* initiate traversal using current state */
pfFrame();
/* Set view parameters for next frame */
UpdateView();
pfChanView(left, Shared->view.xyz, Shared->view.hpr);
if (!ForkedXInput)
{
if (!Shared->XInputInited)
InitXInput(dsp);
if (Shared->XInputInited)
GetXInput(dsp);
}
}
/* terminate cull and draw processes (if they exist) */
pfExit();
/* exit to operating system */
exit(0);
}
static void
InitXInput(pfWSConnection dsp)
{
Window w;
/* wait for X Window to exist in Performer shared memory */
if (w = pfGetPWinWSWindow(Shared->pw))
{
XSelectInput(dsp, w, PointerMotionMask |
ButtonPressMask | ButtonReleaseMask | KeyPressMask);
XMapWindow(dsp, w);
XFlush(dsp);
Shared->XInputInited = 1;
}
}
/*
* DoXInput() runs an asychronous forked even handling process.
* Shared memory structures can be read from this process
* but NO performer calls that set any structures should be
* issues by routines in this process.
*/
static void
DoXInput(void)
{
/* windows from draw should now exist so can attach X input handling
* to the X window
*/
pfWSConnection dsp = pfGetCurWSConnection();
prctl(PR_TERMCHILD); /* Exit when parent does */
sigset(SIGHUP, SIG_DFL); /* Exit when sent SIGHUP by TERMCHILD */
while (1)
{
XEvent event;
if (!Shared->XInputInited)
InitXInput(dsp);
if (Shared->XInputInited)
{
XPeekEvent(dsp, &event);
GetXInput(dsp);
}
}
}
/*
* UpdateView() updates the eyepoint based on the information
* placed in shared memory by GetInput().
*/
static void
UpdateView(void)
{
static float speed = 0.0f;
pfCoord *view = &Shared->view;
float cp;
float mx, my;
static double thisTime = -1.0f;
double prevTime;
float deltaTime;
prevTime = thisTime;
thisTime = pfGetTime();
if (prevTime < 0.0f)
return;
if (!Shared->inWindow || Shared->reset)
{
speed = 0;
Shared->reset = 0;
Shared->accelRate = 0.1f * Shared->sceneSize;
return;
}
deltaTime = thisTime - prevTime;
switch (Shared->mouseButtons)
{
case Button1Mask: /* LEFTMOUSE: faster forward or slower backward*/
case Button1Mask|Button2Mask:
speed += Shared->accelRate * deltaTime;
if (speed > Shared->sceneSize)
speed = Shared->sceneSize;
break;
case Button3Mask: /* RIGHTMOUSE: faster backward or slower foreward*/
case Button3Mask|Button2Mask:
speed -= Shared->accelRate * deltaTime;
if (speed < -Shared->sceneSize)
speed = -Shared->sceneSize;
break;
}
if (Shared->mouseButtons)
{
mx = 2.0f * (Shared->mouseX / (float)Shared->winSizeX) - 1.0f;
my = 2.0f * (Shared->mouseY / (float)Shared->winSizeY) - 1.0f;
/* update view direction */
view->hpr[PF_H] -= mx * PF_ABS(mx) * 30.0f * deltaTime;
view->hpr[PF_P] += my * PF_ABS(my) * 30.0f * deltaTime;
view->hpr[PF_R] = 0.0f;
/* update view position */
cp = cosf(PF_DEG2RAD(view->hpr[PF_P]));
view->xyz[PF_X] += speed*sinf(-PF_DEG2RAD(view->hpr[PF_H]))*cp;
view->xyz[PF_Y] += speed*cosf(-PF_DEG2RAD(view->hpr[PF_H]))*cp;
view->xyz[PF_Z] += speed*sinf( PF_DEG2RAD(view->hpr[PF_P]));
}
else
{
speed = 0.0f;
Shared->accelRate = 0.1f * Shared->sceneSize;
}
}
/*
* CullChannel() -- traverse the scene graph and generate a
* display list for the draw process. This procedure is
* executed in the CULL process.
*/
static void
CullChannel(pfChannel *channel, void *data)
{
/*
* pfDrawGeoSet or other display listable Performer routines
* could be invoked before or after pfCull()
*/
(channel, data);
pfCull();
}
/*
* OpenPipeWin() -- create a stereo win: setup the GL and OpenGL Performer.
* This procedure is executed in the DRAW process
* (when there is a separate draw process).
*/
static int FBAttrs[] = {
PFFB_RGBA,
PFFB_DOUBLEBUFFER,
PFFB_DEPTH_SIZE, 23,
PFFB_RED_SIZE, 1,
PFFB_STENCIL_SIZE, 1,
None,
};
static void
OpenPipeWin(pfPipeWindow *pw)
{
pfPipe *p;
pfPWinFBConfigAttrs(pw, FBAttrs);
pfOpenPWin(pw);
/* create a light source in the "south-west" (QIII) */
Sun = pfNewLight(NULL);
pfLightPos(Sun, -0.3f, -0.3f, 1.0f, 0.0f);
}
/*
* DrawChannel() -- draw a channel and read input queue. this
* procedure is executed in the draw process (when there is a
* separate draw process).
*/
static void
DrawChannel (pfChannel *channel, void *left)
{
Window win;
pfWSConnection dsp;
dsp = pfGetCurWSConnection();
win = pfGetPWinWSDrawable(Shared->pw);
/* rebind light so it stays fixed in position */
pfLightOn(Sun);
/* which buffer to draw into ? */
glXWaitGL();
if(*(int*)left) {
XSGISetStereoBuffer(dsp, win, STEREO_BUFFER_LEFT);
} else {
XSGISetStereoBuffer(dsp, win, STEREO_BUFFER_RIGHT);
}
glXWaitX();
/* erase framebuffer and draw Earth-Sky model */
pfClearChan(channel);
/* invoke Performer draw-processing for this frame */
pfDraw();
/* draw Performer throughput statistics */
if (Shared->drawStats)
pfDrawChanStats(channel);
/* read window origin and size (it may have changed) */
pfGetPWinSize(pfGetChanPWin(channel), &Shared->winSizeX, &Shared->winSizeY);
}
static void
GetXInput(pfWSConnection dsp)
{
static int x=0, y=0;
if (XEventsQueued(dsp, QueuedAfterFlush))
while (XEventsQueued(dsp, QueuedAlready))
{
XEvent event;
XNextEvent(dsp, &event);
switch (event.type)
{
case ConfigureNotify:
break;
case FocusIn:
Shared->inWindow = 1;
break;
case FocusOut:
Shared->inWindow = 0;
break;
case MotionNotify:
{
XMotionEvent *motion_event = (XMotionEvent *) &event;
x = motion_event->x;
y = Shared->winSizeY - motion_event->y;
}
break;
case ButtonPress:
{
XButtonEvent *button_event = (XButtonEvent *) &event;
x = event.xbutton.x;
y = Shared->winSizeY - event.xbutton.y;
Shared->inWindow = 1;
switch (button_event->button) {
case Button1:
Shared->mouseButtons |= Button1Mask;
break;
case Button2:
Shared->mouseButtons |= Button2Mask;
break;
case Button3:
Shared->mouseButtons |= Button3Mask;
break;
}
}
break;
case ButtonRelease:
{
XButtonEvent *button_event = (XButtonEvent *) &event;
switch (button_event->button) {
case Button1:
Shared->mouseButtons &= ~Button1Mask;
break;
case Button2:
Shared->mouseButtons &= ~Button2Mask;
break;
case Button3:
Shared->mouseButtons &= ~Button3Mask;
break;
}
}
break;
case KeyPress:
{
char buf[100];
int rv;
KeySym ks;
rv = XLookupString(&event.xkey, buf, sizeof(buf), &ks, 0);
switch(ks) {
case XK_Escape:
Shared->exitFlag = 1;
exit(0);
break;
case XK_space:
Shared->reset = 1;
PFCOPY_VEC3(Shared->view.xyz, Shared->viewOrig.xyz);
PFCOPY_VEC3(Shared->view.hpr, Shared->viewOrig.hpr);
pfNotify(PFNFY_NOTICE, PFNFY_PRINT, "Reset");
break;
case XK_g:
Shared->drawStats = !Shared->drawStats;
break;
default:
break;
}
}
break;
default:
break;
}/* switch */
}
Shared->mouseX = x;
Shared->mouseY = y;
}
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