xglcomp

annotate src/main.cc @ 6:3f908f812ec7

find changesets by author, revision, files, or words in the commit message
added docs
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 29 Jan 2016 10:23:08 +0200
parents e831d38e6faa
children 03ca0fd49916
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <stdlib.h>
nuclear@0 3 #include <unistd.h>
nuclear@0 4 #include <X11/Xlib.h>
nuclear@0 5 #include <X11/Xutil.h>
nuclear@0 6 #include <X11/Xatom.h>
nuclear@0 7 #include <X11/extensions/Xcomposite.h>
nuclear@1 8 #include <X11/extensions/Xdamage.h>
nuclear@5 9 #include <X11/extensions/shape.h>
nuclear@0 10 #include "cwin.h"
nuclear@2 11 #include "opengl.h"
nuclear@1 12 #include "logger.h"
nuclear@1 13
nuclear@5 14 static bool query_extensions();
nuclear@1 15 static bool register_compositor();
nuclear@2 16 static void start_comp();
nuclear@2 17 static void manage_window(Window xwin);
nuclear@2 18 static void unmanage_window(Window xwin);
nuclear@2 19 static void redraw();
nuclear@3 20 static void draw_window(CompWindow *cwin);
nuclear@2 21 static void reshape(int x, int y);
nuclear@1 22
nuclear@2 23 Display *dpy;
nuclear@2 24 int screen_num;
nuclear@2 25 Window root_win, comp_win;
nuclear@2 26 int root_width, root_height;
nuclear@1 27
nuclear@5 28 static int xdmg_ev_base, xdmg_err_base;
nuclear@5 29 static int xshape_ev_base, xshape_err_base;
nuclear@5 30
nuclear@1 31 int main(int argc, char **argv)
nuclear@1 32 {
nuclear@1 33 if(!(dpy = XOpenDisplay(0))) {
nuclear@1 34 log_error("failed to open X display\n");
nuclear@1 35 return 1;
nuclear@1 36 }
nuclear@2 37 screen_num = DefaultScreen(dpy);
nuclear@2 38 root_win = RootWindow(dpy, screen_num);
nuclear@2 39 root_width = DisplayWidth(dpy, screen_num);
nuclear@2 40 root_height = DisplayHeight(dpy, screen_num);
nuclear@1 41 log_info("display size %dx%d\n", root_width, root_height);
nuclear@1 42
nuclear@5 43 if(!query_extensions()) {
nuclear@1 44 return 1;
nuclear@1 45 }
nuclear@1 46
nuclear@1 47 if(!register_compositor()) {
nuclear@1 48 return 1;
nuclear@1 49 }
nuclear@1 50
nuclear@2 51 comp_win = XCompositeGetOverlayWindow(dpy, root_win);
nuclear@2 52 if(!create_gl(comp_win)) {
nuclear@2 53 return 1;
nuclear@2 54 }
nuclear@2 55
nuclear@2 56 start_comp();
nuclear@2 57 reshape(root_width, root_height);
nuclear@2 58 redraw();
nuclear@1 59
nuclear@1 60 for(;;) {
nuclear@1 61 XEvent ev;
nuclear@1 62 XNextEvent(dpy, &ev);
nuclear@2 63
nuclear@3 64 CompWindow *cwin;
nuclear@2 65 switch(ev.type) {
nuclear@2 66 case CreateNotify:
nuclear@2 67 manage_window(ev.xcreatewindow.window);
nuclear@2 68 break;
nuclear@2 69
nuclear@2 70 case ConfigureNotify:
nuclear@5 71 // XXX is this right?
nuclear@5 72 if((cwin = find_window_xid(ev.xconfigure.window))) {
nuclear@5 73 log_debug("updating window attributes\n");
nuclear@5 74 XGetWindowAttributes(dpy, cwin->xwin, &cwin->attr);
nuclear@5 75 }
nuclear@2 76 break;
nuclear@2 77
nuclear@2 78 case DestroyNotify:
nuclear@2 79 unmanage_window(ev.xdestroywindow.window);
nuclear@2 80 break;
nuclear@2 81
nuclear@2 82 case MapNotify:
nuclear@3 83 if((cwin = find_window_xid(ev.xmap.window))) {
nuclear@3 84 cwin->mapped = true;
nuclear@3 85 }
nuclear@2 86 break;
nuclear@3 87
nuclear@2 88 case UnmapNotify:
nuclear@3 89 if((cwin = find_window_xid(ev.xunmap.window))) {
nuclear@3 90 cwin->mapped = false;
nuclear@3 91 }
nuclear@2 92 break;
nuclear@2 93
nuclear@2 94 case ReparentNotify:
nuclear@2 95 if(ev.xreparent.parent == root_win) {
nuclear@2 96 manage_window(ev.xreparent.window);
nuclear@2 97 } else {
nuclear@2 98 unmanage_window(ev.xreparent.window);
nuclear@2 99 }
nuclear@2 100 break;
nuclear@2 101
nuclear@2 102 case CirculateNotify:
nuclear@2 103 break;
nuclear@2 104
nuclear@2 105 case Expose:
nuclear@3 106 // TODO?
nuclear@2 107 break;
nuclear@2 108
nuclear@2 109 default:
nuclear@2 110 if(ev.type == xdmg_ev_base + XDamageNotify) {
nuclear@2 111 }
nuclear@2 112 }
nuclear@5 113
nuclear@5 114 redraw();
nuclear@1 115 }
nuclear@1 116 }
nuclear@1 117
nuclear@5 118 static bool query_extensions()
nuclear@5 119 {
nuclear@5 120 int xcomp_ev_base, xcomp_err_base;
nuclear@5 121 if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {
nuclear@5 122 log_error("X server doesn't support the composite extension\n");
nuclear@5 123 return false;
nuclear@5 124 }
nuclear@5 125 int xcomp_ver_major, xcomp_ver_minor;
nuclear@5 126 XCompositeQueryVersion(dpy, &xcomp_ver_major, &xcomp_ver_minor);
nuclear@5 127 log_info("Found composite extension version %d.%d\n", xcomp_ver_major, xcomp_ver_minor);
nuclear@5 128 if(xcomp_ver_major <= 0 && xcomp_ver_minor < 3) {
nuclear@5 129 // for NameWindowPixmap & CompositeGetoverlayWindow
nuclear@5 130 log_error("I need at least version 0.3\n");
nuclear@5 131 return false;
nuclear@5 132 }
nuclear@5 133
nuclear@5 134 if(!XDamageQueryExtension(dpy, &xdmg_ev_base, &xdmg_err_base)) {
nuclear@5 135 log_error("X server doesn't support the damage extension\n");
nuclear@5 136 return false;
nuclear@5 137 }
nuclear@5 138
nuclear@5 139 if(!XShapeQueryExtension(dpy, &xshape_ev_base, &xshape_err_base)) {
nuclear@5 140 log_error("X server doesn't support the shape extension\n");
nuclear@5 141 return false;
nuclear@5 142 }
nuclear@5 143
nuclear@5 144 int xfix_ev_base, xfix_err_base;
nuclear@5 145 if(!XFixesQueryExtension(dpy, &xfix_ev_base, &xfix_err_base)) {
nuclear@5 146 log_error("X server doesn't support the Xfixes extension\n");
nuclear@5 147 return false;
nuclear@5 148 }
nuclear@5 149
nuclear@5 150 int xfix_ver_major, xfix_ver_minor;
nuclear@5 151 XFixesQueryVersion(dpy, &xfix_ver_major, &xfix_ver_minor);
nuclear@5 152 log_info("Found xfixes version %d.%d\n", xfix_ver_major, xfix_ver_minor);
nuclear@5 153 if(xfix_ver_major < 2) {
nuclear@5 154 // for SetWindowShapeRegion
nuclear@5 155 log_error("I need at least version 2.0\n");
nuclear@5 156 return false;
nuclear@5 157 }
nuclear@5 158 return true;
nuclear@5 159 }
nuclear@5 160
nuclear@1 161 static bool register_compositor()
nuclear@1 162 {
nuclear@1 163 char atom_name[64];
nuclear@2 164 sprintf(atom_name, "_NET_WM_CM_S%d", screen_num);
nuclear@1 165 Atom xa_wm_cm = XInternAtom(dpy, atom_name, False);
nuclear@1 166
nuclear@1 167 Window win = XGetSelectionOwner(dpy, xa_wm_cm);
nuclear@1 168 if(win != None) {
nuclear@1 169 log_error("Another compositor is running. Stop it and try again.\n");
nuclear@1 170 return false;
nuclear@1 171 }
nuclear@1 172
nuclear@1 173 win = XCreateSimpleWindow(dpy, root_win, 0, 0, 1, 1, 0, None, None);
nuclear@1 174 XSetSelectionOwner(dpy, xa_wm_cm, win, 0);
nuclear@1 175 return true;
nuclear@1 176 }
nuclear@2 177
nuclear@2 178 static void start_comp()
nuclear@2 179 {
nuclear@2 180 XGrabServer(dpy);
nuclear@2 181 XCompositeRedirectSubwindows(dpy, root_win, CompositeRedirectManual);
nuclear@2 182 XSelectInput(dpy, root_win, SubstructureNotifyMask | ExposureMask | StructureNotifyMask);
nuclear@2 183
nuclear@2 184 // manage all top-level windows
nuclear@2 185 Window root_ret, parent;
nuclear@2 186 Window *children;
nuclear@2 187 unsigned int num_children;
nuclear@2 188 XQueryTree(dpy, root_win, &root_ret, &parent, &children, &num_children);
nuclear@2 189
nuclear@2 190 for(unsigned int i=0; i<num_children; i++) {
nuclear@2 191 manage_window(children[i]);
nuclear@2 192 }
nuclear@2 193 log_info("starting compositor, managing %u top-level windows\n", num_children);
nuclear@2 194 XFree(children);
nuclear@5 195 XUngrabServer(dpy);
nuclear@2 196
nuclear@5 197 /* set a zero-area input-shape for the overlay window to let events
nuclear@5 198 * through to the windows under it
nuclear@5 199 */
nuclear@5 200 XserverRegion region = XFixesCreateRegion(dpy, 0, 0);
nuclear@5 201 XFixesSetWindowShapeRegion(dpy, comp_win, ShapeInput, 0, 0, region);
nuclear@5 202 XFixesDestroyRegion(dpy, region);
nuclear@2 203 }
nuclear@2 204
nuclear@2 205 static void manage_window(Window xwin)
nuclear@2 206 {
nuclear@2 207 //log_debug("manage_window %u\n", xwin);
nuclear@2 208 CompWindow *cwin = new CompWindow(xwin);
nuclear@2 209 XGetWindowAttributes(dpy, xwin, &cwin->attr);
nuclear@3 210 cwin->mapped = cwin->attr.map_state != IsUnmapped;
nuclear@2 211 add_window(cwin);
nuclear@2 212 }
nuclear@2 213
nuclear@2 214 static void unmanage_window(Window xwin)
nuclear@2 215 {
nuclear@2 216 //log_debug("unmanage_window %u\n", xwin);
nuclear@2 217 CompWindow *cwin = find_window_xid(xwin);
nuclear@3 218 if(!cwin) return;
nuclear@3 219
nuclear@3 220 if(cwin->xpixmap) {
nuclear@3 221 XFreePixmap(dpy, cwin->xpixmap);
nuclear@2 222 }
nuclear@3 223
nuclear@3 224 remove_window(cwin);
nuclear@3 225 delete cwin;
nuclear@2 226 }
nuclear@2 227
nuclear@2 228 static void redraw()
nuclear@2 229 {
nuclear@2 230 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@2 231
nuclear@3 232 glPushAttrib(GL_ENABLE_BIT);
nuclear@3 233 glEnable(GL_TEXTURE_2D);
nuclear@2 234 glEnable(GL_BLEND);
nuclear@2 235 glBlendFunc(GL_ONE, GL_ONE);
nuclear@2 236
nuclear@2 237 int num_win = get_window_count();
nuclear@2 238 for(int i=0; i<num_win; i++) {
nuclear@2 239 CompWindow *cwin = get_window(i);
nuclear@2 240
nuclear@3 241 if(!cwin->mapped) continue;
nuclear@3 242
nuclear@3 243 if(cwin->attr.x + cwin->attr.width <= 0 ||
nuclear@3 244 cwin->attr.y + cwin->attr.height <= 0 ||
nuclear@3 245 cwin->attr.x >= root_width || cwin->attr.y >= root_height) {
nuclear@3 246 continue;
nuclear@3 247 }
nuclear@3 248
nuclear@3 249 draw_window(cwin);
nuclear@2 250 }
nuclear@2 251
nuclear@3 252 glPopAttrib();
nuclear@2 253
nuclear@2 254 glXSwapBuffers(dpy, comp_win);
nuclear@2 255 }
nuclear@2 256
nuclear@3 257 static void draw_window(CompWindow *cwin)
nuclear@3 258 {
nuclear@3 259 if(!cwin->xpixmap) {
nuclear@3 260 cwin->xpixmap = XCompositeNameWindowPixmap(dpy, cwin->xwin);
nuclear@3 261 if(!cwin->xpixmap) {
nuclear@3 262 log_warning("failed to get pixmap\n");
nuclear@3 263 return;
nuclear@3 264 }
nuclear@3 265 cwin->tex.set_image(dpy, cwin->xpixmap);
nuclear@3 266 }
nuclear@3 267
nuclear@3 268 glBindTexture(GL_TEXTURE_2D, cwin->tex.get_id());
nuclear@3 269
nuclear@3 270 glBegin(GL_QUADS);
nuclear@3 271 glColor3f(0.3, 0.3, 0.3);
nuclear@3 272 glTexCoord2f(0, 0);
nuclear@3 273 glVertex2f(cwin->attr.x, cwin->attr.y);
nuclear@3 274 glTexCoord2f(1, 0);
nuclear@3 275 glVertex2f(cwin->attr.x + cwin->attr.width, cwin->attr.y);
nuclear@3 276 glTexCoord2f(1, 1);
nuclear@3 277 glVertex2f(cwin->attr.x + cwin->attr.width, cwin->attr.y + cwin->attr.height);
nuclear@3 278 glTexCoord2f(0, 1);
nuclear@3 279 glVertex2f(cwin->attr.x, cwin->attr.y + cwin->attr.height);
nuclear@3 280 glEnd();
nuclear@3 281 }
nuclear@3 282
nuclear@2 283 static void reshape(int x, int y)
nuclear@2 284 {
nuclear@2 285 glViewport(0, 0, x, y);
nuclear@2 286
nuclear@2 287 glMatrixMode(GL_PROJECTION);
nuclear@2 288 glLoadIdentity();
nuclear@2 289 glOrtho(0, x, y, 0, -1, 1);
nuclear@2 290 }