xglcomp: db2e91f95531 src/main.cc

xglcomp

view src/main.cc @ 14:db2e91f95531

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 07 Feb 2016 11:52:56 +0200
parents	593a5e4a351f
children	6726f29ebbb8

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <unistd.h>

4 #include <X11/Xlib.h>

5 #include <X11/Xutil.h>

6 #include <X11/Xatom.h>

7 #include <X11/extensions/Xcomposite.h>

8 #include <X11/extensions/Xdamage.h>

9 #include <X11/extensions/shape.h>

10 #include "cwin.h"

11 #include "opengl.h"

12 #include "logger.h"

13 #include "xerr.h"

16 static bool query_extensions();

17 static bool register_compositor();

18 static void start_comp();

19 static void manage_window(Window xwin);

20 static void unmanage_window(Window xwin);

21 static void damage_window(XDamageNotifyEvent *ev);

22 static void redraw();

23 static void draw_window(CompWindow *cwin);

24 static void reshape(int x, int y);

26 Display *dpy;

27 int screen_num;

28 Window root_win, comp_win;

29 int root_width, root_height;

31 static int xdmg_ev_base, xdmg_err_base;

32 static int xshape_ev_base, xshape_err_base;

34 int main(int argc, char **argv)

35 {

36 if(!(dpy = XOpenDisplay(0))) {

37 log_error("failed to open X display\n");

38 return 1;

39 }

40 screen_num = DefaultScreen(dpy);

41 root_win = RootWindow(dpy, screen_num);

42 root_width = DisplayWidth(dpy, screen_num);

43 root_height = DisplayHeight(dpy, screen_num);

44 log_info("display size %dx%d\n", root_width, root_height);

46 if(!query_extensions()) {

47 return 1;

48 }

50 if(!register_compositor()) {

51 return 1;

52 }

54 comp_win = XCompositeGetOverlayWindow(dpy, root_win);

55 if(!create_gl(comp_win)) {

56 return 1;

57 }

59 start_comp();

60 reshape(root_width, root_height);

61 redraw();

63 for(;;) {

64 XEvent ev;

65 XNextEvent(dpy, &ev);

67 CompWindow *cwin;

68 switch(ev.type) {

69 case CreateNotify:

70 log_debug("CreateNotify: %x\n", ev.xcreatewindow.window);

71 manage_window(ev.xcreatewindow.window);

72 break;

74 case ConfigureNotify:

75 if((cwin = find_window_xid(ev.xconfigure.window))) {

76 cwin->attr.x = ev.xconfigure.x;

77 cwin->attr.y = ev.xconfigure.y;

78 cwin->attr.width = ev.xconfigure.width;

79 cwin->attr.height = ev.xconfigure.height;

80 cwin->update_attr();

81 }

82 break;

84 case DestroyNotify:

85 log_debug("DestroyNotify: %x\n", ev.xdestroywindow.window);

86 unmanage_window(ev.xdestroywindow.window);

87 break;

89 case MapNotify:

90 if((cwin = find_window_xid(ev.xmap.window))) {

91 cwin->mapped = true;

92 }

93 break;

95 case UnmapNotify:

96 if((cwin = find_window_xid(ev.xunmap.window))) {

97 cwin->mapped = false;

98 }

99 break;

100

101 case ReparentNotify:

102 if(ev.xreparent.parent == root_win) {

103 manage_window(ev.xreparent.window);

104 } else {

105 unmanage_window(ev.xreparent.window);

106 }

107 break;

108

109 case CirculateNotify:

110 break;

111

112 case Expose:

113 // TODO?

114 break;

115

116 default:

117 if(ev.type == xdmg_ev_base + XDamageNotify) {

118 damage_window((XDamageNotifyEvent*)&ev);

119 }

120 }

121

122 redraw();

123 }

124 }

125

126 static bool query_extensions()

127 {

128 int xcomp_ev_base, xcomp_err_base;

129 if(!XCompositeQueryExtension(dpy, &xcomp_ev_base, &xcomp_err_base)) {

130 log_error("X server doesn't support the composite extension\n");

131 return false;

132 }

133 int xcomp_ver_major, xcomp_ver_minor;

134 XCompositeQueryVersion(dpy, &xcomp_ver_major, &xcomp_ver_minor);

135 log_info("Found composite extension version %d.%d\n", xcomp_ver_major, xcomp_ver_minor);

136 if(xcomp_ver_major <= 0 && xcomp_ver_minor < 3) {

137 // for NameWindowPixmap & CompositeGetoverlayWindow

138 log_error("I need at least version 0.3\n");

139 return false;

140 }

141

142 if(!XDamageQueryExtension(dpy, &xdmg_ev_base, &xdmg_err_base)) {

143 log_error("X server doesn't support the damage extension\n");

144 return false;

145 }

146

147 if(!XShapeQueryExtension(dpy, &xshape_ev_base, &xshape_err_base)) {

148 log_error("X server doesn't support the shape extension\n");

149 return false;

150 }

151

152 int xfix_ev_base, xfix_err_base;

153 if(!XFixesQueryExtension(dpy, &xfix_ev_base, &xfix_err_base)) {

154 log_error("X server doesn't support the Xfixes extension\n");

155 return false;

156 }

157

158 int xfix_ver_major, xfix_ver_minor;

159 XFixesQueryVersion(dpy, &xfix_ver_major, &xfix_ver_minor);

160 log_info("Found xfixes version %d.%d\n", xfix_ver_major, xfix_ver_minor);

161 if(xfix_ver_major < 2) {

162 // for SetWindowShapeRegion

163 log_error("I need at least version 2.0\n");

164 return false;

165 }

166 return true;

167 }

168

169 static bool register_compositor()

170 {

171 char atom_name[64];

172 sprintf(atom_name, "_NET_WM_CM_S%d", screen_num);

173 Atom xa_wm_cm = XInternAtom(dpy, atom_name, False);

174

175 Window win = XGetSelectionOwner(dpy, xa_wm_cm);

176 if(win != None) {

177 log_error("Another compositor is running. Stop it and try again.\n");

178 return false;

179 }

180

181 win = XCreateSimpleWindow(dpy, root_win, 0, 0, 1, 1, 0, None, None);

182 XSetSelectionOwner(dpy, xa_wm_cm, win, 0);

183 return true;

184 }

185

186 static void start_comp()

187 {

188 XGrabServer(dpy);

189 XCompositeRedirectSubwindows(dpy, root_win, CompositeRedirectManual);

190 XSelectInput(dpy, root_win, SubstructureNotifyMask | ExposureMask | StructureNotifyMask);

191

192 // manage all top-level windows

193 Window root_ret, parent;

194 Window *children;

195 unsigned int num_children;

196 XQueryTree(dpy, root_win, &root_ret, &parent, &children, &num_children);

197

198 for(unsigned int i=0; i<num_children; i++) {

199 manage_window(children[i]);

200 }

201 log_info("starting compositor, managing %u top-level windows\n", num_children);

202 XFree(children);

203 XUngrabServer(dpy);

204

205 /* set a zero-area input-shape for the overlay window to let events

206 * through to the windows under it

207 */

208 XserverRegion region = XFixesCreateRegion(dpy, 0, 0);

209 XFixesSetWindowShapeRegion(dpy, comp_win, ShapeInput, 0, 0, region);

210 XFixesDestroyRegion(dpy, region);

211 }

212

213 static void manage_window(Window xwin)

214 {

215 //log_debug("manage_window %u\n", xwin);

216 CompWindow *cwin = new CompWindow(xwin);

217 add_window(cwin);

218 cwin->mapped = cwin->attr.map_state != IsUnmapped;

219 }

220

221 static void unmanage_window(Window xwin)

222 {

223 //log_debug("unmanage_window %u\n", xwin);

224 CompWindow *cwin = find_window_xid(xwin);

225 if(!cwin) return;

226

227 remove_window(cwin);

228 delete cwin;

229 }

230

231 static void damage_window(XDamageNotifyEvent *ev)

232 {

233 XserverRegion region;

234 CompWindow *cwin = find_window_xid(ev->drawable);

235 if(!cwin || !cwin->damage) return;

236

237 region = XFixesCreateRegion(dpy, 0, 0);

238

239 push_xerr_handler(xerr_debug);

240 XDamageSubtract(dpy, cwin->damage, None, region);

241 pop_xerr_handler();

242

243 XFixesDestroyRegion(dpy, region);

244 cwin->damaged = true;

245 }

246

247 static void redraw()

248 {

249 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

250

251 glPushAttrib(GL_ENABLE_BIT);

252 glEnable(GL_TEXTURE_2D);

253 glEnable(GL_BLEND);

254 glBlendFunc(GL_ONE, GL_ONE);

255

256 int num_win = get_window_count();

257 for(int i=0; i<num_win; i++) {

258 CompWindow *cwin = get_window(i);

259

260 if(!cwin->mapped) continue;

261

262 if(cwin->attr.x + cwin->attr.width <= 0 ||

263 cwin->attr.y + cwin->attr.height <= 0 ||

264 cwin->attr.x >= root_width || cwin->attr.y >= root_height) {

265 continue;

266 }

267

268 draw_window(cwin);

269 }

270

271 glPopAttrib();

272

273 glXSwapBuffers(dpy, comp_win);

274 }

275

276 static void draw_window(CompWindow *cwin)

277 {

278 if(!cwin->xpixmap || !cwin->pixmap_valid) {

279 cwin->update_pixmap();

280 if(!cwin->tex_valid) {

281 cwin->update_texture();

282 }

283 }

284

285 glBindTexture(GL_TEXTURE_2D, cwin->tex.get_id());

286

287 glBegin(GL_QUADS);

288 glColor3f(0.3, 0.3, 0.3);

289 glTexCoord2f(0, 0);

290 glVertex2f(cwin->attr.x, cwin->attr.y);

291 glTexCoord2f(1, 0);

292 glVertex2f(cwin->attr.x + cwin->attr.width, cwin->attr.y);

293 glTexCoord2f(1, 1);

294 glVertex2f(cwin->attr.x + cwin->attr.width, cwin->attr.y + cwin->attr.height);

295 glTexCoord2f(0, 1);

296 glVertex2f(cwin->attr.x, cwin->attr.y + cwin->attr.height);

297 glEnd();

298

299 cwin->damaged = false;

300 }

301

302 static void reshape(int x, int y)

303 {

304 glViewport(0, 0, x, y);

305

306 glMatrixMode(GL_PROJECTION);

307 glLoadIdentity();

308 glOrtho(0, x, y, 0, -1, 1);

309 }