doorbell: d3f2a2b19504 spycam/src/main.cc

doorbell

view spycam/src/main.cc @ 2:d3f2a2b19504

doorbell server under construction

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 13 Mar 2016 07:56:03 +0200
parents
children	daade2a35e69

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <unistd.h>

4 #include <sys/select.h>

5 #include <X11/Xlib.h>

6 #include <X11/Xatom.h>

7 #include <GLES2/gl2.h>

8 #include <EGL/egl.h>

9 #include "spycam.h"

11 static void cleanup();

12 static bool create_glwin(int xsz, int ysz);

13 static bool handle_event(XEvent *ev);

14 static void set_window_title(const char *title);

16 static int win_width, win_height;

17 static bool quit, redraw_pending;

18 static Display *dpy;

19 static Window win;

20 static EGLDisplay egl_dpy;

21 static EGLContext egl_ctx;

22 static EGLSurface egl_win;

23 static Atom xa_wm_proto, xa_del_window;

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

26 {

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

28 fprintf(stderr, "failed to connect to the X server.\n");

29 return 1;

30 }

31 xa_wm_proto = XInternAtom(dpy, "WM_PROTOCOLS", False);

32 xa_del_window = XInternAtom(dpy, "WM_DELETE_WINDOW", False);

34 egl_dpy = eglGetDisplay(dpy);

35 int egl_ver_major, egl_ver_minor;

36 if(!eglInitialize(egl_dpy, &egl_ver_major, &egl_ver_minor)) {

37 fprintf(stderr, "failed to initialize EGL\n");

38 return 1;

39 }

40 printf("initialized EGL %d.%d\n", egl_ver_major, egl_ver_minor);

42 if(!create_glwin(800, 600)) {

43 cleanup();

44 return 1;

45 }

47 if(!app_init()) {

48 cleanup();

49 return 1;

50 }

52 for(;;) {

53 while(XPending(dpy) || !redraw_pending) {

54 XEvent ev;

55 XNextEvent(dpy, &ev);

56 if(!handle_event(&ev) || quit) {

57 goto break_main_loop;

58 }

59 }

61 if(redraw_pending) {

62 app_draw();

63 eglSwapBuffers(egl_dpy, egl_win);

64 }

65 }

66 break_main_loop:

68 cleanup();

69 return 0;

70 }

72 void app_quit()

73 {

74 quit = true;

75 }

77 void app_redisplay()

78 {

79 redraw_pending = true;

80 }

82 static void cleanup()

83 {

84 if(egl_dpy) {

85 eglMakeCurrent(egl_dpy, 0, 0, 0);

86 if(egl_win)

87 eglDestroySurface(egl_dpy, egl_win);

88 if(egl_ctx)

89 eglDestroyContext(egl_dpy, egl_ctx);

90 eglTerminate(egl_dpy);

91 }

92 if(dpy) {

93 if(win)

94 XDestroyWindow(dpy, win);

95 XCloseDisplay(dpy);

96 }

97 }

99 static bool create_glwin(int xsz, int ysz)

100 {

101 static const int egl_attr[] = {

102 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,

103 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,

104 EGL_RED_SIZE, 5,

105 EGL_GREEN_SIZE, 5,

106 EGL_BLUE_SIZE, 5,

107 EGL_DEPTH_SIZE, 16,

108 EGL_NONE

109 };

110

111 int scr = DefaultScreen(dpy);

112 Window root_win = RootWindow(dpy, scr);

113

114 EGLConfig cfg;

115 int num_cfg;

116 if(!eglChooseConfig(egl_dpy, egl_attr, &cfg, 1, &num_cfg)) {

117 fprintf(stderr, "failed to find matching EGL visual\n");

118 return false;

119 }

120 int rsize, gsize, bsize, zsize, ssize, vis_id;

121 eglGetConfigAttrib(egl_dpy, cfg, EGL_RED_SIZE, &rsize);

122 eglGetConfigAttrib(egl_dpy, cfg, EGL_GREEN_SIZE, &gsize);

123 eglGetConfigAttrib(egl_dpy, cfg, EGL_BLUE_SIZE, &bsize);

124 eglGetConfigAttrib(egl_dpy, cfg, EGL_DEPTH_SIZE, &zsize);

125 eglGetConfigAttrib(egl_dpy, cfg, EGL_STENCIL_SIZE, &ssize);

126 eglGetConfigAttrib(egl_dpy, cfg, EGL_NATIVE_VISUAL_ID, &vis_id);

127 printf("got visual %d: %d bpp (%d%d%d), %d zbuffer, %d stencil\n", vis_id, rsize + gsize + bsize,

128 rsize, gsize, bsize, zsize, ssize);

129

130 int num_vis;

131 XVisualInfo *vis_info, vis_template;

132 vis_template.visualid = vis_id;

133 if(!(vis_info = XGetVisualInfo(dpy, VisualIDMask, &vis_template, &num_vis))) {

134 fprintf(stderr, "visual id %d is invalid (?!)\n", vis_id);

135 return false;

136 }

137

138 XSetWindowAttributes xattr;

139 xattr.border_pixel = xattr.backing_pixel = BlackPixel(dpy, scr);

140 xattr.colormap = XCreateColormap(dpy, root_win, vis_info->visual, AllocNone);

141 unsigned int xattr_mask = CWColormap | CWBorderPixel | CWBackPixel;

142

143 win = XCreateWindow(dpy, root_win, 0, 0, xsz, ysz, 0, vis_info->depth, InputOutput,

144 vis_info->visual, xattr_mask, &xattr);

145 if(!win) {

146 fprintf(stderr, "failed to create window\n");

147 XFree(vis_info);

148 return false;

149 }

150 XFree(vis_info);

151 XSelectInput(dpy, win, ExposureMask | StructureNotifyMask | KeyPressMask | KeyReleaseMask);

152

153 XSetWMProtocols(dpy, win, &xa_del_window, 1);

154 set_window_title("spycam");

155

156 eglBindAPI(EGL_OPENGL_ES_API);

157

158 if(!(egl_win = eglCreateWindowSurface(egl_dpy, cfg, win, 0))) {

159 fprintf(stderr, "failed to create EGL window\n");

160 XDestroyWindow(dpy, win);

161 return false;

162 }

163

164 static const int ctxattr[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };

165 if(!(egl_ctx = eglCreateContext(egl_dpy, cfg, EGL_NO_CONTEXT, ctxattr))) {

166 fprintf(stderr, "failed to create EGL context\n");

167 eglDestroySurface(egl_dpy, egl_win);

168 XDestroyWindow(dpy, win);

169 return false;

170 }

171 eglMakeCurrent(egl_dpy, egl_win, egl_win, egl_ctx);

172

173 XMapWindow(dpy, win);

174

175 eglQuerySurface(dpy, egl_win, EGL_WIDTH, &win_width);

176 eglQuerySurface(dpy, egl_win, EGL_HEIGHT, &win_height);

177 app_reshape(win_width, win_height);

178

179 return true;

180 }

181

182 static bool handle_event(XEvent *ev)

183 {

184 static bool mapped;

185

186 switch(ev->type) {

187 case Expose:

188 if(mapped) {

189 redraw_pending = true;

190 }

191 break;

192

193 case MapNotify:

194 mapped = true;

195 redraw_pending = true;

196 break;

197

198 case UnmapNotify:

199 mapped = false;

200 redraw_pending = false;

201 break;

202

203 case ConfigureNotify:

204 if(win_width != (int)ev->xconfigure.width || win_height != (int)ev->xconfigure.height) {

205 win_width = ev->xconfigure.width;

206 win_height = ev->xconfigure.height;

207 app_reshape(win_width, win_height);

208 }

209 break;

210

211 case KeyPress:

212 case KeyRelease:

213 app_keyboard(XLookupKeysym(&ev->xkey, 0) & 0xff, ev->type == KeyPress);

214 break;

215

216 case ClientMessage:

217 if(ev->xclient.message_type == xa_wm_proto &&

218 (Atom)ev->xclient.data.l[0] == xa_del_window) {

219 return false;

220 }

221 break;

222

223 default:

224 break;

225 }

226 return true;

227 }

228

229 static void set_window_title(const char *title)

230 {

231 XTextProperty text_prop;

232 XStringListToTextProperty((char**)&title, 1, &text_prop);

233 XSetWMName(dpy, win, &text_prop);

234 XSetWMIconName(dpy, win, &text_prop);

235 XFree(text_prop.value);

236 }