eqemu

annotate src/main.cc @ 0:01fb0dee8a92

find changesets by author, revision, files, or words in the commit message
initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 15 Jul 2014 04:46:10 +0300
parents
children 374d91dd2996
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include <stdlib.h>
nuclear@0 3 #include <assert.h>
nuclear@0 4 #include <errno.h>
nuclear@0 5 #include <unistd.h>
nuclear@0 6 #include <sys/select.h>
nuclear@0 7 #include <GL/glew.h>
nuclear@0 8 #include <X11/Xlib.h>
nuclear@0 9 #include <GL/glx.h>
nuclear@0 10
nuclear@0 11 static bool init();
nuclear@0 12 static void cleanup();
nuclear@0 13 static void display();
nuclear@0 14 static void keyb(int key, bool pressed);
nuclear@0 15 static void mouse(int bn, bool pressed, int x, int y);
nuclear@0 16 static void motion(int x, int y);
nuclear@0 17
nuclear@0 18 static Window create_window(const char *title, int xsz, int ysz);
nuclear@0 19 static void process_events();
nuclear@0 20 static int translate_keysym(KeySym sym);
nuclear@0 21
nuclear@0 22 static Display *dpy;
nuclear@0 23 static Window win;
nuclear@0 24 static GLXContext ctx;
nuclear@0 25 static Atom xa_wm_prot, xa_wm_del_win;
nuclear@0 26
nuclear@0 27 static int win_width, win_height;
nuclear@0 28
nuclear@0 29 static bool redisplay_pending;
nuclear@0 30 static bool win_mapped;
nuclear@0 31
nuclear@0 32 int main()
nuclear@0 33 {
nuclear@0 34 if(!init()) {
nuclear@0 35 fprintf(stderr, "X11/OpenGL initialization failed\n");
nuclear@0 36 return 1;
nuclear@0 37 }
nuclear@0 38 atexit(cleanup);
nuclear@0 39
nuclear@0 40 int xfd = ConnectionNumber(dpy);
nuclear@0 41
nuclear@0 42 for(;;) {
nuclear@0 43 fd_set rd;
nuclear@0 44 FD_ZERO(&rd);
nuclear@0 45
nuclear@0 46 FD_SET(xfd, &rd);
nuclear@0 47
nuclear@0 48 while(select(xfd + 1, &rd, 0, 0, 0) == -1 && errno == EINTR);
nuclear@0 49
nuclear@0 50 if(FD_ISSET(xfd, &rd)) {
nuclear@0 51 process_events();
nuclear@0 52 }
nuclear@0 53
nuclear@0 54 if(redisplay_pending) {
nuclear@0 55 display();
nuclear@0 56 redisplay_pending = false;
nuclear@0 57 }
nuclear@0 58 }
nuclear@0 59 return 0;
nuclear@0 60 }
nuclear@0 61
nuclear@0 62 static bool init()
nuclear@0 63 {
nuclear@0 64 if(!(dpy = XOpenDisplay(0))) {
nuclear@0 65 fprintf(stderr, "failed to connect to the X server!\n");
nuclear@0 66 return false;
nuclear@0 67 }
nuclear@0 68
nuclear@0 69 if(!(win = create_window("dummy equeue device", 800, 600))) {
nuclear@0 70 return false;
nuclear@0 71 }
nuclear@0 72
nuclear@0 73 return true;
nuclear@0 74 }
nuclear@0 75
nuclear@0 76 static void cleanup()
nuclear@0 77 {
nuclear@0 78 if(!dpy) return;
nuclear@0 79
nuclear@0 80 if(win) {
nuclear@0 81 XDestroyWindow(dpy, win);
nuclear@0 82 }
nuclear@0 83 XCloseDisplay(dpy);
nuclear@0 84 }
nuclear@0 85
nuclear@0 86 static void display()
nuclear@0 87 {
nuclear@0 88 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0 89
nuclear@0 90 glMatrixMode(GL_MODELVIEW);
nuclear@0 91 glLoadIdentity();
nuclear@0 92
nuclear@0 93 glXSwapBuffers(dpy, win);
nuclear@0 94 assert(glGetError() == GL_NO_ERROR);
nuclear@0 95 }
nuclear@0 96
nuclear@0 97 static void reshape(int x, int y)
nuclear@0 98 {
nuclear@0 99 glViewport(0, 0, x, y);
nuclear@0 100
nuclear@0 101 glMatrixMode(GL_PROJECTION);
nuclear@0 102 glLoadIdentity();
nuclear@0 103 gluPerspective(50.0, (float)x / (float)y, 0.5, 500.0);
nuclear@0 104 }
nuclear@0 105
nuclear@0 106 static void keyb(int key, bool pressed)
nuclear@0 107 {
nuclear@0 108 if(pressed) {
nuclear@0 109 switch(key) {
nuclear@0 110 case 27:
nuclear@0 111 exit(0);
nuclear@0 112 }
nuclear@0 113 }
nuclear@0 114 }
nuclear@0 115
nuclear@0 116 static void mouse(int bn, bool pressed, int x, int y)
nuclear@0 117 {
nuclear@0 118 }
nuclear@0 119
nuclear@0 120 static void motion(int x, int y)
nuclear@0 121 {
nuclear@0 122 }
nuclear@0 123
nuclear@0 124 static Window create_window(const char *title, int xsz, int ysz)
nuclear@0 125 {
nuclear@0 126 int scr = DefaultScreen(dpy);
nuclear@0 127 Window root = RootWindow(dpy, scr);
nuclear@0 128
nuclear@0 129 int glxattr[] = {
nuclear@0 130 GLX_RGBA,
nuclear@0 131 GLX_RED_SIZE, 8,
nuclear@0 132 GLX_GREEN_SIZE, 8,
nuclear@0 133 GLX_BLUE_SIZE, 8,
nuclear@0 134 GLX_DEPTH_SIZE, 24,
nuclear@0 135 GLX_DOUBLEBUFFER,
nuclear@0 136 #if defined(GLX_VERSION_1_4) || defined(GLX_ARB_multisample)
nuclear@0 137 GLX_SAMPLE_BUFFERS_ARB, 1,
nuclear@0 138 GLX_SAMPLES_ARB, 1,
nuclear@0 139 #endif
nuclear@0 140 None
nuclear@0 141 };
nuclear@0 142
nuclear@0 143 XVisualInfo *vis = glXChooseVisual(dpy, scr, glxattr);
nuclear@0 144 if(!vis) {
nuclear@0 145 fprintf(stderr, "failed to find a suitable visual\n");
nuclear@0 146 return 0;
nuclear@0 147 }
nuclear@0 148
nuclear@0 149 if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
nuclear@0 150 fprintf(stderr, "failed to create OpenGL context\n");
nuclear@0 151 XFree(vis);
nuclear@0 152 return -1;
nuclear@0 153 }
nuclear@0 154
nuclear@0 155 XSetWindowAttributes xattr;
nuclear@0 156 xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
nuclear@0 157 xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
nuclear@0 158 unsigned int xattr_mask = CWColormap | CWBackPixel | CWBorderPixel;
nuclear@0 159
nuclear@0 160 Window win = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
nuclear@0 161 vis->visual, xattr_mask, &xattr);
nuclear@0 162 if(!win) {
nuclear@0 163 fprintf(stderr, "failed to create window\n");
nuclear@0 164 glXDestroyContext(dpy, ctx);
nuclear@0 165 XFree(vis);
nuclear@0 166 return -1;
nuclear@0 167 }
nuclear@0 168 XFree(vis);
nuclear@0 169
nuclear@0 170 unsigned int evmask = StructureNotifyMask | VisibilityChangeMask | ExposureMask |
nuclear@0 171 KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask |
nuclear@0 172 ButtonMotionMask | PointerMotionMask;
nuclear@0 173 XSelectInput(dpy, win, evmask);
nuclear@0 174
nuclear@0 175 xa_wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
nuclear@0 176 xa_wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
nuclear@0 177 XSetWMProtocols(dpy, win, &xa_wm_del_win, 1);
nuclear@0 178
nuclear@0 179 XClassHint hint;
nuclear@0 180 hint.res_name = hint.res_class = (char*)"equeue_win";
nuclear@0 181 XSetClassHint(dpy, win, &hint);
nuclear@0 182
nuclear@0 183 XTextProperty wm_name;
nuclear@0 184 XStringListToTextProperty((char**)&title, 1, &wm_name);
nuclear@0 185 XSetWMName(dpy, win, &wm_name);
nuclear@0 186 XSetWMIconName(dpy, win, &wm_name);
nuclear@0 187 XFree(wm_name.value);
nuclear@0 188
nuclear@0 189 XMapWindow(dpy, win);
nuclear@0 190 glXMakeCurrent(dpy, win, ctx);
nuclear@0 191
nuclear@0 192 return win;
nuclear@0 193 }
nuclear@0 194
nuclear@0 195 static void process_events()
nuclear@0 196 {
nuclear@0 197 XEvent ev;
nuclear@0 198
nuclear@0 199 while(XPending(dpy)) {
nuclear@0 200 XNextEvent(dpy, &ev);
nuclear@0 201 switch(ev.type) {
nuclear@0 202 case MapNotify:
nuclear@0 203 win_mapped = true;
nuclear@0 204 break;
nuclear@0 205
nuclear@0 206 case UnmapNotify:
nuclear@0 207 win_mapped = false;
nuclear@0 208 break;
nuclear@0 209
nuclear@0 210 case Expose:
nuclear@0 211 if(win_mapped && ev.xexpose.count == 0) {
nuclear@0 212 redisplay_pending = 1;
nuclear@0 213 }
nuclear@0 214 break;
nuclear@0 215
nuclear@0 216 case MotionNotify:
nuclear@0 217 motion(ev.xmotion.x, ev.xmotion.y);
nuclear@0 218 break;
nuclear@0 219
nuclear@0 220 case ButtonPress:
nuclear@0 221 mouse(ev.xbutton.button - 1, true, ev.xbutton.x, ev.xbutton.y);
nuclear@0 222 break;
nuclear@0 223
nuclear@0 224 case ButtonRelease:
nuclear@0 225 mouse(ev.xbutton.button - 1, false, ev.xbutton.x, ev.xbutton.y);
nuclear@0 226 break;
nuclear@0 227
nuclear@0 228 case KeyPress:
nuclear@0 229 {
nuclear@0 230 KeySym sym = XLookupKeysym(&ev.xkey, 0);
nuclear@0 231 keyb(translate_keysym(sym), true);
nuclear@0 232 }
nuclear@0 233 break;
nuclear@0 234
nuclear@0 235 case KeyRelease:
nuclear@0 236 {
nuclear@0 237 KeySym sym = XLookupKeysym(&ev.xkey, 0);
nuclear@0 238 keyb(translate_keysym(sym), false);
nuclear@0 239 }
nuclear@0 240 break;
nuclear@0 241
nuclear@0 242 case ConfigureNotify:
nuclear@0 243 {
nuclear@0 244 int xsz = ev.xconfigure.width;
nuclear@0 245 int ysz = ev.xconfigure.height;
nuclear@0 246
nuclear@0 247 if(xsz != win_width || ysz != win_height) {
nuclear@0 248 win_width = xsz;
nuclear@0 249 win_height = ysz;
nuclear@0 250 reshape(xsz, ysz);
nuclear@0 251 }
nuclear@0 252 }
nuclear@0 253 break;
nuclear@0 254
nuclear@0 255 case ClientMessage:
nuclear@0 256 if(ev.xclient.message_type == xa_wm_prot) {
nuclear@0 257 if((Atom)ev.xclient.data.l[0] == xa_wm_del_win) {
nuclear@0 258 exit(0);
nuclear@0 259 }
nuclear@0 260 }
nuclear@0 261 break;
nuclear@0 262
nuclear@0 263 default:
nuclear@0 264 break;
nuclear@0 265 }
nuclear@0 266
nuclear@0 267 }
nuclear@0 268 }
nuclear@0 269
nuclear@0 270 static int translate_keysym(KeySym sym)
nuclear@0 271 {
nuclear@0 272 switch(sym) {
nuclear@0 273 case XK_BackSpace:
nuclear@0 274 return '\b';
nuclear@0 275 case XK_Tab:
nuclear@0 276 return '\t';
nuclear@0 277 case XK_Linefeed:
nuclear@0 278 return '\r';
nuclear@0 279 case XK_Return:
nuclear@0 280 return '\n';
nuclear@0 281 case XK_Escape:
nuclear@0 282 return 27;
nuclear@0 283 default:
nuclear@0 284 break;
nuclear@0 285 }
nuclear@0 286 return (int)sym;
nuclear@0 287 }