xglcomp: e831d38e6faa src/main.cc

xglcomp

view src/main.cc @ 3:e831d38e6faa

textures

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 22 Jan 2016 07:46:47 +0200
parents	876efea9424c
children	86e57e56a454

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 "cwin.h"

10 #include "opengl.h"

11 #include "logger.h"

13 static bool register_compositor();

14 static void start_comp();

15 static void manage_window(Window xwin);

16 static void unmanage_window(Window xwin);

17 static void redraw();

18 static void draw_window(CompWindow *cwin);

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

21 Display *dpy;

22 int screen_num;

23 Window root_win, comp_win;

24 int root_width, root_height;

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

27 {

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

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

30 return 1;

31 }

32 screen_num = DefaultScreen(dpy);

33 root_win = RootWindow(dpy, screen_num);

34 root_width = DisplayWidth(dpy, screen_num);

35 root_height = DisplayHeight(dpy, screen_num);

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

38 int xcomp_ev_base, xcomp_err_base;

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

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

41 return 1;

42 }

43 int xcomp_ver_major = 0, xcomp_ver_minor = 4;

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

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

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

47 // for NameWindowPixmap & CompositeGetoverlayWindow

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

49 return 1;

50 }

52 int xdmg_ev_base, xdmg_err_base;

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

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

55 return 1;

56 }

57 // TODO also XFixes ?

59 if(!register_compositor()) {

60 return 1;

61 }

63 comp_win = XCompositeGetOverlayWindow(dpy, root_win);

64 if(!create_gl(comp_win)) {

65 return 1;

66 }

68 start_comp();

69 reshape(root_width, root_height);

70 redraw();

72 for(;;) {

73 XEvent ev;

74 XNextEvent(dpy, &ev);

76 CompWindow *cwin;

77 switch(ev.type) {

78 case CreateNotify:

79 manage_window(ev.xcreatewindow.window);

80 break;

82 case ConfigureNotify:

83 break;

85 case DestroyNotify:

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 }

119 }

120 }

121 }

122

123 static bool register_compositor()

124 {

125 char atom_name[64];

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

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

128

129 Window win = XGetSelectionOwner(dpy, xa_wm_cm);

130 if(win != None) {

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

132 return false;

133 }

134

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

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

137 return true;

138 }

139

140 static void start_comp()

141 {

142 XGrabServer(dpy);

143 XCompositeRedirectSubwindows(dpy, root_win, CompositeRedirectManual);

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

145

146 // manage all top-level windows

147 Window root_ret, parent;

148 Window *children;

149 unsigned int num_children;

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

151

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

153 manage_window(children[i]);

154 }

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

156 XFree(children);

157

158 XUngrabServer(dpy);

159 }

160

161 static void manage_window(Window xwin)

162 {

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

164 CompWindow *cwin = new CompWindow(xwin);

165 XGetWindowAttributes(dpy, xwin, &cwin->attr);

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

167 add_window(cwin);

168 }

169

170 static void unmanage_window(Window xwin)

171 {

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

173 CompWindow *cwin = find_window_xid(xwin);

174 if(!cwin) return;

175

176 if(cwin->xpixmap) {

177 XFreePixmap(dpy, cwin->xpixmap);

178 }

179

180 remove_window(cwin);

181 delete cwin;

182 }

183

184 static void redraw()

185 {

186 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

187

188 glPushAttrib(GL_ENABLE_BIT);

189 glEnable(GL_TEXTURE_2D);

190 glEnable(GL_BLEND);

191 glBlendFunc(GL_ONE, GL_ONE);

192

193 int num_win = get_window_count();

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

195 CompWindow *cwin = get_window(i);

196

197 if(!cwin->mapped) continue;

198

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

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

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

202 continue;

203 }

204

205 draw_window(cwin);

206 }

207

208 glPopAttrib();

209

210 glXSwapBuffers(dpy, comp_win);

211 }

212

213 static void draw_window(CompWindow *cwin)

214 {

215 if(!cwin->xpixmap) {

216 cwin->xpixmap = XCompositeNameWindowPixmap(dpy, cwin->xwin);

217 if(!cwin->xpixmap) {

218 log_warning("failed to get pixmap\n");

219 return;

220 }

221 cwin->tex.set_image(dpy, cwin->xpixmap);

222 }

223

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

225

226 glBegin(GL_QUADS);

227 glColor3f(0.3, 0.3, 0.3);

228 glTexCoord2f(0, 0);

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

230 glTexCoord2f(1, 0);

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

232 glTexCoord2f(1, 1);

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

234 glTexCoord2f(0, 1);

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

236 glEnd();

237 }

238

239 static void reshape(int x, int y)

240 {

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

242

243 glMatrixMode(GL_PROJECTION);

244 glLoadIdentity();

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

246 }