trying to make this into a standalone xscreensaver module
[censuslogo] / src / main_x11.c
diff --git a/src/main_x11.c b/src/main_x11.c
new file mode 100644 (file)
index 0000000..fe87caa
--- /dev/null
@@ -0,0 +1,323 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <X11/Xlib.h>
+#include <GL/glx.h>
+#include "app.h"
+#include "vroot.h"
+
+#define DEF_WIN_WIDTH  1280
+#define DEF_WIN_HEIGHT 800
+
+static Window create_xwindow(void);
+static int init_gl(void);
+static void destroy_gl(void);
+static int proc_xevent(XEvent *ev);
+
+static Display *dpy;
+static int scr;
+static Window win, root;
+static GLXContext ctx;
+static XVisualInfo *visinf;
+static Atom xa_wm_proto, xa_wm_delwin;
+
+static volatile int quit;
+static int mapped;
+
+static struct timeval tv, tv0;
+
+int main(int argc, char **argv)
+{
+       int i;
+       unsigned int wid;
+       char *endp;
+
+       if((endp = getenv("XSCREENSAVER_WINDOW"))) {
+               printf("XSCREENSAVER_WINDOW: %s\n", endp);
+       }
+
+       if(!(dpy = XOpenDisplay(0))) {
+               fprintf(stderr, "failed to open connection to the X server\n");
+               return 1;
+       }
+       scr = DefaultScreen(dpy);
+       root = RootWindow(dpy, scr);
+
+       xa_wm_proto = XInternAtom(dpy, "WM_PROTOCOLS", False);
+       xa_wm_delwin = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
+
+       for(i=0; i<argc; i++) {
+               printf("argv[%d]: %s\n", i, argv[i]);
+       }
+
+       for(i=1; i<argc; i++) {
+               if(strcmp(argv[i], "-root") == 0) {
+                       argv[i] = argv[--argc];
+                       if(!(win = VirtualRootWindowOfScreen(ScreenOfDisplay(dpy, scr)))) {
+                               fprintf(stderr, "failed to find root window!\n");
+                               XCloseDisplay(dpy);
+                               return 1;
+                       }
+                       i--;
+
+               } else if(strcmp(argv[i], "-window-id") == 0) {
+                       if((wid = strtol(argv[i+1], &endp, 0)) > 0 && endp != argv[i+1]) {
+                               printf("using window: %x\n", wid);
+                               win = (Window)wid;
+                               memmove(argv + i, argv + i + 2, (argc - i - 2) * sizeof *argv);
+                               argc -= 2;
+                               i--;
+                       } else {
+                               fprintf(stderr, "invalid option: -window-id must be followed by a valid window id\n");
+                               XCloseDisplay(dpy);
+                               return 1;
+                       }
+               }
+       }
+
+       if(app_parse_args(argc, argv) == -1) {
+               XCloseDisplay(dpy);
+               return 1;
+       }
+
+       if(!win && !(win = create_xwindow())) {
+               XCloseDisplay(dpy);
+               return 1;
+       }
+       if(init_gl() == -1) {
+               return 1;
+       }
+       if(app_init() == -1) {
+               destroy_gl();
+               XCloseDisplay(dpy);
+               return 1;
+       }
+
+       gettimeofday(&tv0, 0);
+
+       while(!quit) {
+               while(XPending(dpy)) {
+                       XEvent ev;
+                       XNextEvent(dpy, &ev);
+                       if(proc_xevent(&ev) == -1 || quit) {
+                               goto done;
+                       }
+               }
+
+               gettimeofday(&tv, 0);
+               msec = (tv.tv_sec - tv0.tv_sec) * 1000 + (tv.tv_usec - tv0.tv_usec) / 1000;
+
+               app_display();
+
+               glXSwapBuffers(dpy, win);
+               assert(glGetError() == GL_NO_ERROR);
+       }
+
+done:
+       destroy_gl();
+       XCloseDisplay(dpy);
+       return 0;
+}
+
+void app_quit(void)
+{
+       exit(0);
+}
+
+void app_fullscreen(void)
+{
+}
+
+void app_windowed(void)
+{
+}
+
+static XVisualInfo *choose_visual(void)
+{
+       int glxattr[] = {
+               GLX_RGBA, GLX_DOUBLEBUFFER,
+               GLX_RED_SIZE, 1,
+               GLX_GREEN_SIZE, 1,
+               GLX_BLUE_SIZE, 1,
+               GLX_DEPTH_SIZE, 1,
+               GLX_SAMPLE_BUFFERS, 1,
+               GLX_SAMPLES, 8,
+               None
+       };
+       int *sample_buffers = glxattr + 10;
+       int *num_samples = glxattr + 13;
+       XVisualInfo *res;
+
+       do {
+               res = glXChooseVisual(dpy, scr, glxattr);
+               *num_samples >>= 1;
+               if(*num_samples <= 1) {
+                       *sample_buffers = None;
+               }
+       } while(!res && *num_samples > 0);
+
+       return res;
+}
+
+static XVisualInfo *match_visual(Window win)
+{
+       int numvi, i;
+       XVisualInfo vitmp, *vi;
+       XWindowAttributes wattr;
+       unsigned int mask = VisualScreenMask | VisualDepthMask | VisualClassMask;
+
+       XGetWindowAttributes(dpy, win, &wattr);
+
+       vitmp.visualid = XVisualIDFromVisual(wattr.visual);
+       vi = XGetVisualInfo(dpy, VisualIDMask, &vitmp, &numvi);
+       vitmp = *vi;
+       vi = XGetVisualInfo(dpy, mask, &vitmp, &numvi);
+
+       printf("found %d matching visuals\n", numvi);
+       for(i=0; i<numvi; i++) {
+               int nsamp;
+
+               glXGetConfig(dpy, vi + i, GLX_SAMPLES, &nsamp);
+
+               printf("%x (msaa: %d)\n", (unsigned int)vi[i].visualid, nsamp);
+       }
+       return 0;
+}
+
+static Window create_xwindow(void)
+{
+       XSetWindowAttributes xattr;
+       long xattr_mask, evmask;
+
+       if(!(visinf = choose_visual())) {
+               fprintf(stderr, "failed to find appropriate visual\n");
+               return 0;
+       }
+
+       xattr.colormap = XCreateColormap(dpy, root, visinf->visual, AllocNone);
+       xattr.background_pixel = BlackPixel(dpy, scr);
+       xattr_mask = CWColormap | CWBackPixel;
+
+       if(!(win = XCreateWindow(dpy, root, 0, 0, DEF_WIN_WIDTH, DEF_WIN_HEIGHT, 0,
+                       visinf->depth, InputOutput, visinf->visual, xattr_mask, &xattr))) {
+               fprintf(stderr, "failed to create X window\n");
+               XFree(visinf);
+               visinf = 0;
+               return 0;
+       }
+
+       evmask = ExposureMask | StructureNotifyMask | KeyPressMask;
+       XSelectInput(dpy, win, evmask);
+
+       Xutf8SetWMProperties(dpy, win, "census", "census", 0, 0, 0, 0, 0);
+       XSetWMProtocols(dpy, win, &xa_wm_delwin, 1);
+
+       XMapRaised(dpy, win);
+       return win;
+}
+
+static int init_gl(void)
+{
+       XWindowAttributes wattr;
+       int rbits, gbits, bbits, zbits, sbits, nsamp;
+
+       if(!win) return -1;
+
+       XGetWindowAttributes(dpy, win, &wattr);
+
+       if(!visinf && !(visinf = choose_visual())) {
+               fprintf(stderr, "failed to find appropriate visual\n");
+               return -1;
+       }
+
+       if(!(ctx = glXCreateContext(dpy, visinf, 0, 1))) {
+               fprintf(stderr, "failed to create OpenGL context\n");
+               XFree(visinf);
+               if(win != root) {
+                       XDestroyWindow(dpy, win);
+               }
+               return -1;
+       }
+
+       glXGetConfig(dpy, visinf, GLX_RED_SIZE, &rbits);
+       glXGetConfig(dpy, visinf, GLX_GREEN_SIZE, &gbits);
+       glXGetConfig(dpy, visinf, GLX_BLUE_SIZE, &bbits);
+       glXGetConfig(dpy, visinf, GLX_DEPTH_SIZE, &zbits);
+       glXGetConfig(dpy, visinf, GLX_STENCIL_SIZE, &sbits);
+       glXGetConfig(dpy, visinf, GLX_SAMPLES, &nsamp);
+
+       printf("created GLX visual %d bpp (%d%d%d), %dz, %ds, %d samp/pix\n",
+                       visinf->depth, rbits, gbits, bbits, zbits, sbits, nsamp);
+
+       printf("glXMakeCurrent(%p, %x, %p)\n", (void*)dpy, (unsigned int)win, (void*)ctx);
+       glXMakeCurrent(dpy, win, ctx);
+       app_reshape(wattr.width, wattr.height);
+       win_width = wattr.width;
+       win_height = wattr.height;
+       return 0;
+}
+
+static void destroy_gl(void)
+{
+       if(visinf) {
+               XFree(visinf);
+       }
+       if(ctx) {
+               glXMakeCurrent(dpy, 0, 0);
+               glXDestroyContext(dpy, ctx);
+       }
+       if(win && win != root) {
+               XDestroyWindow(dpy, win);
+       }
+}
+
+static int proc_xevent(XEvent *ev)
+{
+       KeySym sym;
+
+       switch(ev->type) {
+       case MapNotify:
+               mapped = 1;
+               break;
+
+       case UnmapNotify:
+               mapped = 0;
+               break;
+
+       case ConfigureNotify:
+               if(ev->xconfigure.width != win_width || ev->xconfigure.height != win_height) {
+                       int w = ev->xconfigure.width;
+                       int h = ev->xconfigure.height;
+                       app_reshape(w, h);
+                       win_width = w;
+                       win_height = h;
+               }
+               break;
+
+       case KeyPress:
+       case KeyRelease:
+               if((sym = XLookupKeysym(&ev->xkey, 0))) {
+                       if(sym == XK_Escape) {
+                               sym = 27;
+                       }
+                       app_keyboard(sym, ev->type == KeyPress);
+               }
+               break;
+
+       case ClientMessage:
+               if(ev->xclient.message_type == xa_wm_proto) {
+                       if(ev->xclient.data.l[0] == xa_wm_delwin) {
+                               app_quit();
+                       }
+               }
+               break;
+
+       default:
+               break;
+       }
+
+       return 0;
+}