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demos: fix issues in glxcontexts.c

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The reshape() function was called when there was no GLX context so
the viewport/modelview/projection setup wasn't doing anything.  Move
the call to reshape() into draw().

Also, remove -stereo, -fullscreen options and do some general clean-up.
This commit is contained in:
Brian Paul
2009-06-23 09:31:27 -06:00
parent 2f184d0d9f
commit b79e6a59d8
1 changed files with 46 additions and 114 deletions
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progs/xdemos/glxcontexts.c
+46 -114
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@@ -20,16 +20,17 @@
*/
/*
* This is a port of the infamous "gears" demo to straight GLX (i.e. no GLUT)
* Port by Brian Paul 23 March 2001
* Version of glxgears that creates/destroys the rendering context for each
* frame. Also periodically destroy/recreate the window.
* Good for finding memory leaks, etc.
*
* Command line options:
* -info print GL implementation information
* -stereo use stereo enabled GLX visual
*
*/
#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
@@ -92,13 +93,8 @@ 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 fullscreen = GL_FALSE; /* Create a single fullscreen window */
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. */
XVisualInfo *visinfo;
static XVisualInfo *visinfo = NULL;
static int WinWidth = 300, WinHeight = 300;
/*
@@ -272,22 +268,13 @@ do_draw(void)
}
/* new window size or exposure */
static void
reshape(int width, int height)
{
glViewport(0, 0, (GLint) width, (GLint) height);
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);
@@ -299,7 +286,6 @@ reshape(int width, int height)
glLoadIdentity();
glTranslatef(0.0, 0.0, -40.0);
}
static void
@@ -337,7 +323,7 @@ init(void)
glEnable(GL_NORMALIZE);
}
static void
draw( Display *dpy, Window win )
@@ -354,36 +340,9 @@ draw( Display *dpy, Window win )
init();
if (stereo) {
/* First left eye. */
glDrawBuffer(GL_BACK_LEFT);
reshape(WinWidth, WinHeight);
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();
do_draw();
glDeleteLists(gear1, 1);
glDeleteLists(gear2, 1);
@@ -410,14 +369,6 @@ make_window( Display *dpy, const char *name,
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;
@@ -427,22 +378,9 @@ make_window( Display *dpy, const char *name,
scrnum = DefaultScreen( dpy );
root = RootWindow( dpy, scrnum );
if (fullscreen) {
x = 0; y = 0;
width = DisplayWidth( dpy, scrnum );
height = DisplayHeight( dpy, scrnum );
}
if (stereo)
visinfo = glXChooseVisual( dpy, scrnum, stereoAttribs );
else
visinfo = glXChooseVisual( dpy, scrnum, attribs );
visinfo = glXChooseVisual( dpy, scrnum, attribs );
if (!visinfo) {
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");
printf("Error: couldn't get an RGB, Double-buffered visual\n");
exit(1);
}
@@ -451,7 +389,7 @@ make_window( Display *dpy, const char *name,
attr.border_pixel = 0;
attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
attr.override_redirect = fullscreen;
attr.override_redirect = 0;
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect;
win = XCreateWindow( dpy, root, x, y, width, height,
@@ -479,10 +417,9 @@ static void
event_loop(Display *dpy)
{
Window win;
make_window(dpy, "glxgears", 0, 0, 300, 300, &win);
make_window(dpy, "glxgears", 0, 0, WinWidth, WinHeight, &win);
XMapWindow(dpy, win);
while (1) {
while (XPending(dpy) > 0) {
XEvent event;
@@ -492,34 +429,35 @@ event_loop(Display *dpy)
/* we'll redraw below */
break;
case ConfigureNotify:
reshape(event.xconfigure.width, event.xconfigure.height);
WinWidth = event.xconfigure.width;
WinHeight = event.xconfigure.height;
break;
case KeyPress:
{
char buffer[10];
int r, code;
code = XLookupKeysym(&event.xkey, 0);
if (code == XK_Left) {
view_roty += 5.0;
}
else if (code == XK_Right) {
view_roty -= 5.0;
}
else if (code == XK_Up) {
view_rotx += 5.0;
}
else if (code == XK_Down) {
view_rotx -= 5.0;
}
else {
r = XLookupString(&event.xkey, buffer, sizeof(buffer),
NULL, NULL);
if (buffer[0] == 27) {
/* escape */
return;
}
}
}
{
char buffer[10];
int r, code;
code = XLookupKeysym(&event.xkey, 0);
if (code == XK_Left) {
view_roty += 5.0;
}
else if (code == XK_Right) {
view_roty -= 5.0;
}
else if (code == XK_Up) {
view_rotx += 5.0;
}
else if (code == XK_Down) {
view_rotx -= 5.0;
}
else {
r = XLookupString(&event.xkey, buffer, sizeof(buffer),
NULL, NULL);
if (buffer[0] == 27) {
/* escape */
return;
}
}
}
}
}
@@ -550,9 +488,12 @@ event_loop(Display *dpy)
printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
fps);
tRate0 = t;
/* Destroy window and create new one */
XDestroyWindow(dpy, win);
make_window(dpy, "glxgears", (int)(fps * 100) % 100, (int)(fps * 100) % 100, 300, 300, &win);
make_window(dpy, "glxgears",
(int)(fps * 100) % 100, (int)(fps * 100) % 100, /* x,y */
WinWidth, WinHeight, &win);
XMapWindow(dpy, win);
frames = 0;
@@ -562,7 +503,6 @@ event_loop(Display *dpy)
}
int
main(int argc, char *argv[])
{
@@ -579,12 +519,6 @@ 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 if (strcmp(argv[i], "-fullscreen") == 0) {
fullscreen = GL_TRUE;
}
else
printf("Warrning: unknown parameter: %s\n", argv[i]);
}
@@ -596,7 +530,6 @@ main(int argc, char *argv[])
return -1;
}
if (printInfo) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
@@ -604,7 +537,6 @@ main(int argc, char *argv[])
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
event_loop(dpy);
XCloseDisplay(dpy);