summaryrefslogtreecommitdiff
path: root/progs/xdemos/glxsnoop.c
diff options
context:
space:
mode:
Diffstat (limited to 'progs/xdemos/glxsnoop.c')
-rw-r--r--progs/xdemos/glxsnoop.c377
1 files changed, 0 insertions, 377 deletions
diff --git a/progs/xdemos/glxsnoop.c b/progs/xdemos/glxsnoop.c
deleted file mode 100644
index 2e951345b5..0000000000
--- a/progs/xdemos/glxsnoop.c
+++ /dev/null
@@ -1,377 +0,0 @@
-/**
- * Display/snoop the z/stencil/back/front buffers of another app's window.
- * Also, an example of the need for shared ancillary renderbuffers.
- *
- * Hint: use 'xwininfo' to get a window's ID.
- *
- * Brian Paul
- * 11 Oct 2007
- */
-
-#define GL_GLEXT_PROTOTYPES
-
-#include <GL/gl.h>
-#include <GL/glx.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <X11/keysym.h>
-
-
-#define Z_BUFFER 1
-#define STENCIL_BUFFER 2
-#define BACK_BUFFER 3
-#define FRONT_BUFFER 4
-
-
-static int Buffer = BACK_BUFFER;
-static int WindowID = 0;
-static const char *DisplayName = NULL;
-static GLXContext Context = 0;
-static int Width, Height;
-
-
-/**
- * Grab the z/stencil/back/front image from the srcWin and display it
- * (possibly converted to grayscale) in the dstWin.
- */
-static void
-redraw(Display *dpy, Window srcWin, Window dstWin )
-{
- GLubyte *image = malloc(Width * Height * 4);
-
- glXMakeCurrent(dpy, srcWin, Context);
- glPixelStorei(GL_PACK_ALIGNMENT, 1);
- if (Buffer == BACK_BUFFER) {
- glReadBuffer(GL_BACK);
- glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, image);
- }
- else if (Buffer == FRONT_BUFFER) {
- glReadBuffer(GL_FRONT);
- glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, image);
- }
- else if (Buffer == Z_BUFFER) {
- GLfloat *z = malloc(Width * Height * sizeof(GLfloat));
- int i;
- glReadPixels(0, 0, Width, Height, GL_DEPTH_COMPONENT, GL_FLOAT, z);
- for (i = 0; i < Width * Height; i++) {
- image[i*4+0] =
- image[i*4+1] =
- image[i*4+2] = (GLint) (255.0 * z[i]);
- image[i*4+3] = 255;
- }
- free(z);
- }
- else if (Buffer == STENCIL_BUFFER) {
- GLubyte *sten = malloc(Width * Height * sizeof(GLubyte));
- int i, min = 100, max = -1;
- float step;
- int sz;
- glGetIntegerv(GL_STENCIL_BITS, &sz);
- glReadPixels(0, 0, Width, Height,
- GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, sten);
- /* find min/max for converting stencil to grayscale */
- for (i = 0; i < Width * Height; i++) {
- if (sten[i] < min)
- min = sten[i];
- if (sten[i] > max)
- max = sten[i];
- }
- if (min == max)
- step = 0;
- else
- step = 255.0 / (float) (max - min);
- for (i = 0; i < Width * Height; i++) {
- image[i*4+0] =
- image[i*4+1] =
- image[i*4+2] = (GLint) ((sten[i] - min) * step);
- image[i*4+3] = 255;
- }
- free(sten);
- }
-
- glXMakeCurrent(dpy, dstWin, Context);
- glWindowPos2iARB(0, 0);
- glDrawBuffer(GL_FRONT);
- glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, image);
- glFlush();
-
- free(image);
-}
-
-
-static void
-set_window_title(Display *dpy, Window win, const char *title)
-{
- XSizeHints sizehints;
- sizehints.flags = 0;
- XSetStandardProperties(dpy, win, title, title,
- None, (char **)NULL, 0, &sizehints);
-}
-
-
-static Window
-make_gl_window(Display *dpy, XVisualInfo *visinfo, int width, int height)
-{
- int scrnum;
- XSetWindowAttributes attr;
- unsigned long mask;
- Window root;
- Window win;
- int x = 0, y = 0;
- char *name = NULL;
-
- scrnum = DefaultScreen( dpy );
- root = RootWindow( dpy, scrnum );
-
- /* window attributes */
- attr.background_pixel = 0;
- attr.border_pixel = 0;
- attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
- attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
- mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
-
- win = XCreateWindow( dpy, root, x, y, width, height,
- 0, visinfo->depth, InputOutput,
- visinfo->visual, mask, &attr );
-
- /* set hints and properties */
- {
- XSizeHints sizehints;
- sizehints.x = x;
- sizehints.y = y;
- sizehints.width = width;
- sizehints.height = height;
- sizehints.flags = USSize | USPosition;
- XSetNormalHints(dpy, win, &sizehints);
- XSetStandardProperties(dpy, win, name, name,
- None, (char **)NULL, 0, &sizehints);
- }
-
- return win;
-}
-
-
-static void
-update_window_title(Display *dpy, Window win)
-{
- char title[1000], *buf;
-
- switch (Buffer) {
- case Z_BUFFER:
- buf = "Z";
- break;
- case STENCIL_BUFFER:
- buf = "Stencil";
- break;
- case BACK_BUFFER:
- buf = "Back";
- break;
- case FRONT_BUFFER:
- buf = "Front";
- break;
- default:
- buf = "";
- }
-
- sprintf(title, "glxsnoop window 0x%x (%s buffer)", (int) WindowID, buf);
-
- set_window_title(dpy, win, title);
-}
-
-
-static void
-keypress(Display *dpy, Window win, char key)
-{
- switch (key) {
- case 27:
- /* escape */
- exit(0);
- break;
- case 's':
- Buffer = STENCIL_BUFFER;
- break;
- case 'z':
- Buffer = Z_BUFFER;
- break;
- case 'f':
- Buffer = FRONT_BUFFER;
- break;
- case 'b':
- Buffer = BACK_BUFFER;
- break;
- default:
- return;
- }
-
- update_window_title(dpy, win);
- redraw(dpy, WindowID, win);
-}
-
-
-static void
-event_loop(Display *dpy, Window win)
-{
- XEvent event;
-
- while (1) {
- XNextEvent( dpy, &event );
-
- switch (event.type) {
- case Expose:
- redraw(dpy, WindowID, win);
- break;
- case ConfigureNotify:
- /*resize( event.xconfigure.width, event.xconfigure.height );*/
- break;
- case KeyPress:
- {
- char buffer[10];
- int r, code;
- code = XLookupKeysym(&event.xkey, 0);
- if (code == XK_Left) {
- }
- else {
- r = XLookupString(&event.xkey, buffer, sizeof(buffer),
- NULL, NULL);
- keypress(dpy, win, buffer[0]);
- }
- }
- default:
- /* nothing */
- ;
- }
- }
-}
-
-
-static VisualID
-get_window_visualid(Display *dpy, Window win)
-{
- XWindowAttributes attr;
-
- if (XGetWindowAttributes(dpy, win, &attr)) {
- return attr.visual->visualid;
- }
- else {
- return 0;
- }
-}
-
-
-static void
-get_window_size(Display *dpy, Window win, int *w, int *h)
-{
- XWindowAttributes attr;
-
- if (XGetWindowAttributes(dpy, win, &attr)) {
- *w = attr.width;
- *h = attr.height;
- }
- else {
- *w = *h = 0;
- }
-}
-
-
-static XVisualInfo *
-visualid_to_visualinfo(Display *dpy, VisualID vid)
-{
- XVisualInfo *vinfo, templ;
- long mask;
- int n;
-
- templ.visualid = vid;
- mask = VisualIDMask;
-
- vinfo = XGetVisualInfo(dpy, mask, &templ, &n);
- return vinfo;
-}
-
-
-static void
-key_usage(void)
-{
- printf("Keyboard:\n");
- printf(" z - display Z buffer\n");
- printf(" s - display stencil buffer\n");
- printf(" f - display front color buffer\n");
- printf(" b - display back buffer\n");
-}
-
-
-static void
-usage(void)
-{
- printf("Usage: glxsnoop [-display dpy] windowID\n");
- key_usage();
-}
-
-
-static void
-parse_opts(int argc, char *argv[])
-{
- int i;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-h") == 0) {
- usage();
- exit(0);
- }
- else if (strcmp(argv[i], "-display") == 0) {
- DisplayName = argv[i + 1];
- i++;
- }
- else {
- if (argv[i][0] == '0' && argv[i][1] == 'x') {
- /* hex */
- WindowID = strtol(argv[i], NULL, 16);
- }
- else {
- WindowID = atoi(argv[i]);
- }
- break;
- }
- }
-
- if (!WindowID) {
- usage();
- exit(0);
- }
-}
-
-
-int
-main( int argc, char *argv[] )
-{
- Display *dpy;
- VisualID vid;
- XVisualInfo *visinfo;
- Window win;
-
- parse_opts(argc, argv);
-
- key_usage();
-
- dpy = XOpenDisplay(DisplayName);
-
- /* find the VisualID for the named window */
- vid = get_window_visualid(dpy, WindowID);
- get_window_size(dpy, WindowID, &Width, &Height);
-
- visinfo = visualid_to_visualinfo(dpy, vid);
-
- Context = glXCreateContext( dpy, visinfo, NULL, True );
- if (!Context) {
- printf("Error: glXCreateContext failed\n");
- exit(1);
- }
-
- win = make_gl_window(dpy, visinfo, Width, Height);
- XMapWindow(dpy, win);
- update_window_title(dpy, win);
-
- event_loop( dpy, win );
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 13:57:29 +0000