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annotate spycam/src/main.cc @ 0:a5755687dd75

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initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 08 Mar 2016 03:26:01 +0200
parents
children daade2a35e69
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 <sys/select.h>
nuclear@0 5 #include <X11/Xlib.h>
nuclear@0 6 #include <X11/Xatom.h>
nuclear@0 7 #include <GLES2/gl2.h>
nuclear@0 8 #include <EGL/egl.h>
nuclear@0 9 #include "spycam.h"
nuclear@0 10
nuclear@0 11 static void cleanup();
nuclear@0 12 static bool create_glwin(int xsz, int ysz);
nuclear@0 13 static bool handle_event(XEvent *ev);
nuclear@0 14 static void set_window_title(const char *title);
nuclear@0 15
nuclear@0 16 static int win_width, win_height;
nuclear@0 17 static bool quit, redraw_pending;
nuclear@0 18 static Display *dpy;
nuclear@0 19 static Window win;
nuclear@0 20 static EGLDisplay egl_dpy;
nuclear@0 21 static EGLContext egl_ctx;
nuclear@0 22 static EGLSurface egl_win;
nuclear@0 23 static Atom xa_wm_proto, xa_del_window;
nuclear@0 24
nuclear@0 25 int main(int argc, char **argv)
nuclear@0 26 {
nuclear@0 27 if(!(dpy = XOpenDisplay(0))) {
nuclear@0 28 fprintf(stderr, "failed to connect to the X server.\n");
nuclear@0 29 return 1;
nuclear@0 30 }
nuclear@0 31 xa_wm_proto = XInternAtom(dpy, "WM_PROTOCOLS", False);
nuclear@0 32 xa_del_window = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
nuclear@0 33
nuclear@0 34 egl_dpy = eglGetDisplay(dpy);
nuclear@0 35 int egl_ver_major, egl_ver_minor;
nuclear@0 36 if(!eglInitialize(egl_dpy, &egl_ver_major, &egl_ver_minor)) {
nuclear@0 37 fprintf(stderr, "failed to initialize EGL\n");
nuclear@0 38 return 1;
nuclear@0 39 }
nuclear@0 40 printf("initialized EGL %d.%d\n", egl_ver_major, egl_ver_minor);
nuclear@0 41
nuclear@0 42 if(!create_glwin(800, 600)) {
nuclear@0 43 cleanup();
nuclear@0 44 return 1;
nuclear@0 45 }
nuclear@0 46
nuclear@0 47 if(!app_init()) {
nuclear@0 48 cleanup();
nuclear@0 49 return 1;
nuclear@0 50 }
nuclear@0 51
nuclear@0 52 for(;;) {
nuclear@0 53 while(XPending(dpy) || !redraw_pending) {
nuclear@0 54 XEvent ev;
nuclear@0 55 XNextEvent(dpy, &ev);
nuclear@0 56 if(!handle_event(&ev) || quit) {
nuclear@0 57 goto break_main_loop;
nuclear@0 58 }
nuclear@0 59 }
nuclear@0 60
nuclear@0 61 if(redraw_pending) {
nuclear@0 62 app_draw();
nuclear@0 63 eglSwapBuffers(egl_dpy, egl_win);
nuclear@0 64 }
nuclear@0 65 }
nuclear@0 66 break_main_loop:
nuclear@0 67
nuclear@0 68 cleanup();
nuclear@0 69 return 0;
nuclear@0 70 }
nuclear@0 71
nuclear@0 72 void app_quit()
nuclear@0 73 {
nuclear@0 74 quit = true;
nuclear@0 75 }
nuclear@0 76
nuclear@0 77 void app_redisplay()
nuclear@0 78 {
nuclear@0 79 redraw_pending = true;
nuclear@0 80 }
nuclear@0 81
nuclear@0 82 static void cleanup()
nuclear@0 83 {
nuclear@0 84 if(egl_dpy) {
nuclear@0 85 eglMakeCurrent(egl_dpy, 0, 0, 0);
nuclear@0 86 if(egl_win)
nuclear@0 87 eglDestroySurface(egl_dpy, egl_win);
nuclear@0 88 if(egl_ctx)
nuclear@0 89 eglDestroyContext(egl_dpy, egl_ctx);
nuclear@0 90 eglTerminate(egl_dpy);
nuclear@0 91 }
nuclear@0 92 if(dpy) {
nuclear@0 93 if(win)
nuclear@0 94 XDestroyWindow(dpy, win);
nuclear@0 95 XCloseDisplay(dpy);
nuclear@0 96 }
nuclear@0 97 }
nuclear@0 98
nuclear@0 99 static bool create_glwin(int xsz, int ysz)
nuclear@0 100 {
nuclear@0 101 static const int egl_attr[] = {
nuclear@0 102 EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
nuclear@0 103 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
nuclear@0 104 EGL_RED_SIZE, 5,
nuclear@0 105 EGL_GREEN_SIZE, 5,
nuclear@0 106 EGL_BLUE_SIZE, 5,
nuclear@0 107 EGL_DEPTH_SIZE, 16,
nuclear@0 108 EGL_NONE
nuclear@0 109 };
nuclear@0 110
nuclear@0 111 int scr = DefaultScreen(dpy);
nuclear@0 112 Window root_win = RootWindow(dpy, scr);
nuclear@0 113
nuclear@0 114 EGLConfig cfg;
nuclear@0 115 int num_cfg;
nuclear@0 116 if(!eglChooseConfig(egl_dpy, egl_attr, &cfg, 1, &num_cfg)) {
nuclear@0 117 fprintf(stderr, "failed to find matching EGL visual\n");
nuclear@0 118 return false;
nuclear@0 119 }
nuclear@0 120 int rsize, gsize, bsize, zsize, ssize, vis_id;
nuclear@0 121 eglGetConfigAttrib(egl_dpy, cfg, EGL_RED_SIZE, &rsize);
nuclear@0 122 eglGetConfigAttrib(egl_dpy, cfg, EGL_GREEN_SIZE, &gsize);
nuclear@0 123 eglGetConfigAttrib(egl_dpy, cfg, EGL_BLUE_SIZE, &bsize);
nuclear@0 124 eglGetConfigAttrib(egl_dpy, cfg, EGL_DEPTH_SIZE, &zsize);
nuclear@0 125 eglGetConfigAttrib(egl_dpy, cfg, EGL_STENCIL_SIZE, &ssize);
nuclear@0 126 eglGetConfigAttrib(egl_dpy, cfg, EGL_NATIVE_VISUAL_ID, &vis_id);
nuclear@0 127 printf("got visual %d: %d bpp (%d%d%d), %d zbuffer, %d stencil\n", vis_id, rsize + gsize + bsize,
nuclear@0 128 rsize, gsize, bsize, zsize, ssize);
nuclear@0 129
nuclear@0 130 int num_vis;
nuclear@0 131 XVisualInfo *vis_info, vis_template;
nuclear@0 132 vis_template.visualid = vis_id;
nuclear@0 133 if(!(vis_info = XGetVisualInfo(dpy, VisualIDMask, &vis_template, &num_vis))) {
nuclear@0 134 fprintf(stderr, "visual id %d is invalid (?!)\n", vis_id);
nuclear@0 135 return false;
nuclear@0 136 }
nuclear@0 137
nuclear@0 138 XSetWindowAttributes xattr;
nuclear@0 139 xattr.border_pixel = xattr.backing_pixel = BlackPixel(dpy, scr);
nuclear@0 140 xattr.colormap = XCreateColormap(dpy, root_win, vis_info->visual, AllocNone);
nuclear@0 141 unsigned int xattr_mask = CWColormap | CWBorderPixel | CWBackPixel;
nuclear@0 142
nuclear@0 143 win = XCreateWindow(dpy, root_win, 0, 0, xsz, ysz, 0, vis_info->depth, InputOutput,
nuclear@0 144 vis_info->visual, xattr_mask, &xattr);
nuclear@0 145 if(!win) {
nuclear@0 146 fprintf(stderr, "failed to create window\n");
nuclear@0 147 XFree(vis_info);
nuclear@0 148 return false;
nuclear@0 149 }
nuclear@0 150 XFree(vis_info);
nuclear@0 151 XSelectInput(dpy, win, ExposureMask | StructureNotifyMask | KeyPressMask | KeyReleaseMask);
nuclear@0 152
nuclear@0 153 XSetWMProtocols(dpy, win, &xa_del_window, 1);
nuclear@0 154 set_window_title("spycam");
nuclear@0 155
nuclear@0 156 eglBindAPI(EGL_OPENGL_ES_API);
nuclear@0 157
nuclear@0 158 if(!(egl_win = eglCreateWindowSurface(egl_dpy, cfg, win, 0))) {
nuclear@0 159 fprintf(stderr, "failed to create EGL window\n");
nuclear@0 160 XDestroyWindow(dpy, win);
nuclear@0 161 return false;
nuclear@0 162 }
nuclear@0 163
nuclear@0 164 static const int ctxattr[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
nuclear@0 165 if(!(egl_ctx = eglCreateContext(egl_dpy, cfg, EGL_NO_CONTEXT, ctxattr))) {
nuclear@0 166 fprintf(stderr, "failed to create EGL context\n");
nuclear@0 167 eglDestroySurface(egl_dpy, egl_win);
nuclear@0 168 XDestroyWindow(dpy, win);
nuclear@0 169 return false;
nuclear@0 170 }
nuclear@0 171 eglMakeCurrent(egl_dpy, egl_win, egl_win, egl_ctx);
nuclear@0 172
nuclear@0 173 XMapWindow(dpy, win);
nuclear@0 174
nuclear@0 175 eglQuerySurface(dpy, egl_win, EGL_WIDTH, &win_width);
nuclear@0 176 eglQuerySurface(dpy, egl_win, EGL_HEIGHT, &win_height);
nuclear@0 177 app_reshape(win_width, win_height);
nuclear@0 178
nuclear@0 179 return true;
nuclear@0 180 }
nuclear@0 181
nuclear@0 182 static bool handle_event(XEvent *ev)
nuclear@0 183 {
nuclear@0 184 static bool mapped;
nuclear@0 185
nuclear@0 186 switch(ev->type) {
nuclear@0 187 case Expose:
nuclear@0 188 if(mapped) {
nuclear@0 189 redraw_pending = true;
nuclear@0 190 }
nuclear@0 191 break;
nuclear@0 192
nuclear@0 193 case MapNotify:
nuclear@0 194 mapped = true;
nuclear@0 195 redraw_pending = true;
nuclear@0 196 break;
nuclear@0 197
nuclear@0 198 case UnmapNotify:
nuclear@0 199 mapped = false;
nuclear@0 200 redraw_pending = false;
nuclear@0 201 break;
nuclear@0 202
nuclear@0 203 case ConfigureNotify:
nuclear@0 204 if(win_width != (int)ev->xconfigure.width || win_height != (int)ev->xconfigure.height) {
nuclear@0 205 win_width = ev->xconfigure.width;
nuclear@0 206 win_height = ev->xconfigure.height;
nuclear@0 207 app_reshape(win_width, win_height);
nuclear@0 208 }
nuclear@0 209 break;
nuclear@0 210
nuclear@0 211 case KeyPress:
nuclear@0 212 case KeyRelease:
nuclear@0 213 app_keyboard(XLookupKeysym(&ev->xkey, 0) & 0xff, ev->type == KeyPress);
nuclear@0 214 break;
nuclear@0 215
nuclear@0 216 case ClientMessage:
nuclear@0 217 if(ev->xclient.message_type == xa_wm_proto &&
nuclear@0 218 (Atom)ev->xclient.data.l[0] == xa_del_window) {
nuclear@0 219 return false;
nuclear@0 220 }
nuclear@0 221 break;
nuclear@0 222
nuclear@0 223 default:
nuclear@0 224 break;
nuclear@0 225 }
nuclear@0 226 return true;
nuclear@0 227 }
nuclear@0 228
nuclear@0 229 static void set_window_title(const char *title)
nuclear@0 230 {
nuclear@0 231 XTextProperty text_prop;
nuclear@0 232 XStringListToTextProperty((char**)&title, 1, &text_prop);
nuclear@0 233 XSetWMName(dpy, win, &text_prop);
nuclear@0 234 XSetWMIconName(dpy, win, &text_prop);
nuclear@0 235 XFree(text_prop.value);
nuclear@0 236 }