diff options
| -rw-r--r-- | progs/xdemos/glxgears.c | 109 |
1 files changed, 92 insertions, 17 deletions
diff --git a/progs/xdemos/glxgears.c b/progs/xdemos/glxgears.c index a82a0b9bc71..a4a9c5e3f44 100644 --- a/progs/xdemos/glxgears.c +++ b/progs/xdemos/glxgears.c @@ -25,6 +25,7 @@ * * Command line options: * -info print GL implementation information + * -stereo use stereo enabled GLX visual * */ @@ -84,6 +85,11 @@ static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0; static GLint gear1, gear2, gear3; static GLfloat angle = 0.0; +static GLboolean stereo = GL_FALSE; /* Enable stereo. */ +static GLfloat eyesep = 5.0; /* Eye separation. */ +static GLfloat fix_point = 40.0; /* Fixation point distance. */ +static GLfloat left, right, asp; /* Stereo frustum params. */ + /* * @@ -225,7 +231,7 @@ gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, static void -draw(void) +do_draw(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); @@ -255,21 +261,69 @@ draw(void) glPopMatrix(); } +static void +draw(void) +{ + if (stereo) { + /* First left eye. */ + glDrawBuffer(GL_BACK_LEFT); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(left, right, -asp, asp, 5.0, 60.0); + + glMatrixMode(GL_MODELVIEW); + + glPushMatrix(); + glTranslated(+0.5 * eyesep, 0.0, 0.0); + do_draw(); + glPopMatrix(); + + /* Then right eye. */ + glDrawBuffer(GL_BACK_RIGHT); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-right, -left, -asp, asp, 5.0, 60.0); + + glMatrixMode(GL_MODELVIEW); + + glPushMatrix(); + glTranslated(-0.5 * eyesep, 0.0, 0.0); + do_draw(); + glPopMatrix(); + } else + do_draw(); +} + /* new window size or exposure */ static void reshape(int width, int height) { - GLfloat h = (GLfloat) height / (GLfloat) width; - glViewport(0, 0, (GLint) width, (GLint) height); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0); + + if (stereo) { + GLfloat w; + + asp = (GLfloat) height / (GLfloat) width; + w = fix_point * (1.0 / 5.0); + + left = -5.0 * ((w - 0.5 * eyesep) / fix_point); + right = 5.0 * ((w + 0.5 * eyesep) / fix_point); + } else { + GLfloat h = (GLfloat) height / (GLfloat) width; + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0); + } + glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -40.0); } + static void @@ -318,13 +372,21 @@ make_window( Display *dpy, const char *name, int x, int y, int width, int height, Window *winRet, GLXContext *ctxRet) { - int attrib[] = { GLX_RGBA, - GLX_RED_SIZE, 1, - GLX_GREEN_SIZE, 1, - GLX_BLUE_SIZE, 1, - GLX_DOUBLEBUFFER, - GLX_DEPTH_SIZE, 1, - None }; + int attribs[] = { GLX_RGBA, + GLX_RED_SIZE, 1, + GLX_GREEN_SIZE, 1, + GLX_BLUE_SIZE, 1, + GLX_DOUBLEBUFFER, + GLX_DEPTH_SIZE, 1, + None }; + int stereoAttribs[] = { GLX_RGBA, + GLX_RED_SIZE, 1, + GLX_GREEN_SIZE, 1, + GLX_BLUE_SIZE, 1, + GLX_DOUBLEBUFFER, + GLX_DEPTH_SIZE, 1, + GLX_STEREO, + None }; int scrnum; XSetWindowAttributes attr; unsigned long mask; @@ -336,9 +398,16 @@ make_window( Display *dpy, const char *name, scrnum = DefaultScreen( dpy ); root = RootWindow( dpy, scrnum ); - visinfo = glXChooseVisual( dpy, scrnum, attrib ); + if (stereo) + visinfo = glXChooseVisual( dpy, scrnum, stereoAttribs ); + else + visinfo = glXChooseVisual( dpy, scrnum, attribs ); if (!visinfo) { - printf("Error: couldn't get an RGB, Double-buffered visual\n"); + if (stereo) { + printf("Error: couldn't get an RGB, " + "Double-buffered, Stereo visual\n"); + } else + printf("Error: couldn't get an RGB, Double-buffered visual\n"); exit(1); } @@ -460,7 +529,7 @@ main(int argc, char *argv[]) Display *dpy; Window win; GLXContext ctx; - char *dpyName = ":0"; + char *dpyName = NULL; GLboolean printInfo = GL_FALSE; int i; @@ -472,11 +541,17 @@ main(int argc, char *argv[]) else if (strcmp(argv[i], "-info") == 0) { printInfo = GL_TRUE; } + else if (strcmp(argv[i], "-stereo") == 0) { + stereo = GL_TRUE; + } + else + printf("Warrning: unknown parameter: %s\n", argv[i]); } dpy = XOpenDisplay(dpyName); if (!dpy) { - printf("Error: couldn't open display %s\n", dpyName); + printf("Error: couldn't open display %s\n", + dpyName ? dpyName : getenv("DISPLAY")); return -1; } |