* This is a port of the infamous "gears" demo to straight GLX (i.e. no GLUT)
* Port by Brian Paul 23 March 2001
*
- * Command line options:
- * -info print GL implementation information
- *
+ * See usage() below for command line options.
*/
#include <X11/keysym.h>
#include <GL/gl.h>
#include <GL/glx.h>
+#include <GL/glxext.h>
+
+#ifndef GLX_MESA_swap_control
+#define GLX_MESA_swap_control 1
+typedef int (*PFNGLXGETSWAPINTERVALMESAPROC)(void);
+#endif
#define BENCHMARK
#include <unistd.h>
/* return current time (in seconds) */
-static int
+static double
current_time(void)
{
struct timeval tv;
struct timezone tz;
(void) gettimeofday(&tv, &tz);
#endif
- return (int) tv.tv_sec;
+ return (double) tv.tv_sec + tv.tv_usec / 1000000.0;
}
#else /*BENCHMARK*/
/* dummy */
-static int
+static double
current_time(void)
{
- return 0;
+ /* update this function for other platforms! */
+ static double t = 0.0;
+ static int warn = 1;
+ if (warn) {
+ fprintf(stderr, "Warning: current_time() not implemented!!\n");
+ warn = 0;
+ }
+ return t += 1.0;
}
#endif /*BENCHMARK*/
#endif
+/** Event handler results: */
+#define NOP 0
+#define EXIT 1
+#define DRAW 2
+
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 GLboolean animate = GL_TRUE; /* Animation */
+static GLfloat eyesep = 5.0; /* Eye separation. */
+static GLfloat fix_point = 40.0; /* Fixation point distance. */
+static GLfloat left, right, asp; /* Stereo frustum params. */
+
/*
*
}
+static void
+draw_gears(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);
+ 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);
+ draw();
+ glPopMatrix();
+ }
+ else {
+ draw();
+ }
+}
+
+
+/** Draw single frame, do SwapBuffers, compute FPS */
+static void
+draw_frame(Display *dpy, Window win)
+{
+ static int frames = 0;
+ static double tRot0 = -1.0, tRate0 = -1.0;
+ double dt, t = current_time();
+
+ if (tRot0 < 0.0)
+ tRot0 = t;
+ dt = t - tRot0;
+ tRot0 = t;
+
+ if (animate) {
+ /* advance rotation for next frame */
+ angle += 70.0 * dt; /* 70 degrees per second */
+ if (angle > 3600.0)
+ angle -= 3600.0;
+ }
+
+ draw_gears();
+ glXSwapBuffers(dpy, win);
+
+ frames++;
+
+ if (tRate0 < 0.0)
+ tRate0 = t;
+ if (t - tRate0 >= 5.0) {
+ GLfloat seconds = t - tRate0;
+ GLfloat fps = frames / seconds;
+ printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
+ fps);
+ tRate0 = t;
+ frames = 0;
+ }
+}
+
+
/* 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
}
+/**
+ * Remove window border/decorations.
+ */
+static void
+no_border( Display *dpy, Window w)
+{
+ static const unsigned MWM_HINTS_DECORATIONS = (1 << 1);
+ static const int PROP_MOTIF_WM_HINTS_ELEMENTS = 5;
+
+ typedef struct
+ {
+ unsigned long flags;
+ unsigned long functions;
+ unsigned long decorations;
+ long inputMode;
+ unsigned long status;
+ } PropMotifWmHints;
+
+ PropMotifWmHints motif_hints;
+ Atom prop, proptype;
+ unsigned long flags = 0;
+
+ /* setup the property */
+ motif_hints.flags = MWM_HINTS_DECORATIONS;
+ motif_hints.decorations = flags;
+
+ /* get the atom for the property */
+ prop = XInternAtom( dpy, "_MOTIF_WM_HINTS", True );
+ if (!prop) {
+ /* something went wrong! */
+ return;
+ }
+
+ /* not sure this is correct, seems to work, XA_WM_HINTS didn't work */
+ proptype = prop;
+
+ XChangeProperty( dpy, w, /* display, window */
+ prop, proptype, /* property, type */
+ 32, /* format: 32-bit datums */
+ PropModeReplace, /* mode */
+ (unsigned char *) &motif_hints, /* data */
+ PROP_MOTIF_WM_HINTS_ELEMENTS /* nelements */
+ );
+}
+
+
/*
* Create an RGB, double-buffered window.
* Return the window and context handles.
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;
scrnum = DefaultScreen( dpy );
root = RootWindow( dpy, scrnum );
- visinfo = glXChooseVisual( dpy, scrnum, attrib );
+ 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 );
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);
}
attr.border_pixel = 0;
attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+ /* XXX this is a bad way to get a borderless window! */
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
- win = XCreateWindow( dpy, root, 0, 0, width, height,
+ win = XCreateWindow( dpy, root, x, y, width, height,
0, visinfo->depth, InputOutput,
visinfo->visual, mask, &attr );
+ if (fullscreen)
+ no_border(dpy, win);
+
/* set hints and properties */
{
XSizeHints sizehints;
}
+/**
+ * Determine whether or not a GLX extension is supported.
+ */
+static int
+is_glx_extension_supported(Display *dpy, const char *query)
+{
+ const int scrnum = DefaultScreen(dpy);
+ const char *glx_extensions = NULL;
+ const size_t len = strlen(query);
+ const char *ptr;
+
+ if (glx_extensions == NULL) {
+ glx_extensions = glXQueryExtensionsString(dpy, scrnum);
+ }
+
+ ptr = strstr(glx_extensions, query);
+ return ((ptr != NULL) && ((ptr[len] == ' ') || (ptr[len] == '\0')));
+}
+
+
+/**
+ * Attempt to determine whether or not the display is synched to vblank.
+ */
static void
-event_loop(Display *dpy, Window win)
+query_vsync(Display *dpy, GLXDrawable drawable)
{
- while (1) {
- while (XPending(dpy) > 0) {
- XEvent event;
- XNextEvent(dpy, &event);
- switch (event.type) {
- case Expose:
- /* we'll redraw below */
- break;
- case ConfigureNotify:
- reshape(event.xconfigure.width, 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;
- }
- }
- }
- }
- }
+ int interval = 0;
+
+#if defined(GLX_EXT_swap_control)
+ if (is_glx_extension_supported(dpy, "GLX_EXT_swap_control")) {
+ unsigned int tmp = -1;
+ glXQueryDrawable(dpy, drawable, GLX_SWAP_INTERVAL_EXT, &tmp);
+ interval = tmp;
+ } else
+#endif
+ if (is_glx_extension_supported(dpy, "GLX_MESA_swap_control")) {
+ PFNGLXGETSWAPINTERVALMESAPROC pglXGetSwapIntervalMESA =
+ (PFNGLXGETSWAPINTERVALMESAPROC)
+ glXGetProcAddressARB((const GLubyte *) "glXGetSwapIntervalMESA");
+
+ interval = (*pglXGetSwapIntervalMESA)();
+ } else if (is_glx_extension_supported(dpy, "GLX_SGI_swap_control")) {
+ /* The default swap interval with this extension is 1. Assume that it
+ * is set to the default.
+ *
+ * Many Mesa-based drivers default to 0, but all of these drivers also
+ * export GLX_MESA_swap_control. In that case, this branch will never
+ * be taken, and the correct result should be reported.
+ */
+ interval = 1;
+ }
- /* next frame */
- angle += 2.0;
- if (angle > 3600.0)
- angle -= 3600.0;
- draw();
- glXSwapBuffers(dpy, win);
+ if (interval > 0) {
+ printf("Running synchronized to the vertical refresh. The framerate should be\n");
+ if (interval == 1) {
+ printf("approximately the same as the monitor refresh rate.\n");
+ } else if (interval > 1) {
+ printf("approximately 1/%d the monitor refresh rate.\n",
+ interval);
+ }
+ }
+}
- /* calc framerate */
+/**
+ * Handle one X event.
+ * \return NOP, EXIT or DRAW
+ */
+static int
+handle_event(Display *dpy, Window win, XEvent *event)
+{
+ (void) dpy;
+ (void) win;
+
+ switch (event->type) {
+ case Expose:
+ return DRAW;
+ case ConfigureNotify:
+ reshape(event->xconfigure.width, event->xconfigure.height);
+ break;
+ case KeyPress:
{
- static int t0 = -1;
- static int frames = 0;
- int t = current_time();
-
- if (t0 < 0)
- t0 = t;
-
- frames++;
-
- if (t - t0 >= 5.0) {
- GLfloat seconds = t - t0;
- GLfloat fps = frames / seconds;
- printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
- fps);
- t0 = t;
- frames = 0;
+ 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 EXIT;
+ }
+ else if (buffer[0] == 'a' || buffer[0] == 'A') {
+ animate = !animate;
+ }
+ }
+ return DRAW;
+ }
+ }
+ return NOP;
+}
+
+
+static void
+event_loop(Display *dpy, Window win)
+{
+ while (1) {
+ int op;
+ while (!animate || XPending(dpy) > 0) {
+ XEvent event;
+ XNextEvent(dpy, &event);
+ op = handle_event(dpy, win, &event);
+ if (op == EXIT)
+ return;
+ else if (op == DRAW)
+ break;
}
+
+ draw_frame(dpy, win);
}
}
+static void
+usage(void)
+{
+ printf("Usage:\n");
+ printf(" -display <displayname> set the display to run on\n");
+ printf(" -stereo run in stereo mode\n");
+ printf(" -fullscreen run in fullscreen mode\n");
+ printf(" -info display OpenGL renderer info\n");
+ printf(" -geometry WxH+X+Y window geometry\n");
+}
+
+
int
main(int argc, char *argv[])
{
+ unsigned int winWidth = 300, winHeight = 300;
+ int x = 0, y = 0;
Display *dpy;
Window win;
GLXContext ctx;
- char *dpyName = ":0";
+ char *dpyName = NULL;
GLboolean printInfo = GL_FALSE;
int i;
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 if (i < argc-1 && strcmp(argv[i], "-geometry") == 0) {
+ XParseGeometry(argv[i+1], &x, &y, &winWidth, &winHeight);
+ i++;
+ }
+ else {
+ usage();
+ return -1;
+ }
}
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;
}
- make_window(dpy, "glxgears", 0, 0, 300, 300, &win, &ctx);
+ make_window(dpy, "glxgears", x, y, winWidth, winHeight, &win, &ctx);
XMapWindow(dpy, win);
glXMakeCurrent(dpy, win, ctx);
+ query_vsync(dpy, win);
if (printInfo) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
init();
+ /* Set initial projection/viewing transformation.
+ * We can't be sure we'll get a ConfigureNotify event when the window
+ * first appears.
+ */
+ reshape(winWidth, winHeight);
+
event_loop(dpy, win);
+ glDeleteLists(gear1, 1);
+ glDeleteLists(gear2, 1);
+ glDeleteLists(gear3, 1);
+ glXMakeCurrent(dpy, None, NULL);
glXDestroyContext(dpy, ctx);
XDestroyWindow(dpy, win);
XCloseDisplay(dpy);
projects / mesa.git / blobdiff