progs/openvg/trivial/eglcommon.c

   1 #include "eglcommon.h"
   2
   3
   4 #include <assert.h>
   5 #include <math.h>
   6 #include <stdlib.h>
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <X11/Xlib.h>
  10 #include <X11/Xutil.h>
  11 #include <X11/keysym.h>
  12 #include <VG/openvg.h>  /* using full OpenGL for now */
  13 #include <GLES/egl.h>
  14
  15
  16 static init_func    init = 0;
  17 static draw_func    draw = 0;
  18 static reshape_func reshape = 0;
  19 static key_func     keyPress = 0;
  20 static VGint width = 300, height = 300;
  21
  22
  23 void set_window_size(int w, int h)
  24 {
  25    width = w;
  26    height = h;
  27 }
  28
  29 /*
  30  * Create an RGB, double-buffered X window.
  31  * Return the window and context handles.
  32  */
  33 static void
  34 make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
  35               const char *name,
  36               int x, int y, int width, int height,
  37               Window *winRet,
  38               EGLContext *ctxRet,
  39               EGLSurface *surfRet)
  40 {
  41    static const EGLint attribs[] = {
  42       EGL_RED_SIZE, 1,
  43       EGL_GREEN_SIZE, 1,
  44       EGL_BLUE_SIZE, 1,
  45       EGL_NONE
  46    };
  47
  48    int scrnum;
  49    XSetWindowAttributes attr;
  50    unsigned long mask;
  51    Window root;
  52    Window win;
  53    XVisualInfo *visInfo, visTemplate;
  54    int num_visuals;
  55    EGLContext ctx;
  56    EGLConfig config;
  57    EGLint num_configs;
  58    EGLint vid;
  59
  60    scrnum = DefaultScreen( x_dpy );
  61    root = RootWindow( x_dpy, scrnum );
  62
  63    if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
  64       printf("Error: couldn't get an EGL visual config\n");
  65       exit(1);
  66    }
  67
  68    assert(config);
  69    assert(num_configs > 0);
  70
  71    if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
  72       printf("Error: eglGetConfigAttrib() failed\n");
  73       exit(1);
  74    }
  75
  76    /* The X window visual must match the EGL config */
  77    visTemplate.visualid = vid;
  78    visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
  79    if (!visInfo) {
  80       printf("Error: couldn't get X visual\n");
  81       exit(1);
  82    }
  83
  84    /* window attributes */
  85    attr.background_pixel = 0;
  86    attr.border_pixel = 0;
  87    attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
  88    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
  89    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
  90
  91    win = XCreateWindow( x_dpy, root, 0, 0, width, height,
  92                         0, visInfo->depth, InputOutput,
  93                         visInfo->visual, mask, &attr );
  94
  95    /* set hints and properties */
  96    {
  97       XSizeHints sizehints;
  98       sizehints.x = x;
  99       sizehints.y = y;
 100       sizehints.width  = width;
 101       sizehints.height = height;
 102       sizehints.flags = USSize | USPosition;
 103       XSetNormalHints(x_dpy, win, &sizehints);
 104       XSetStandardProperties(x_dpy, win, name, name,
 105                               None, (char **)NULL, 0, &sizehints);
 106    }
 107
 108    eglBindAPI(EGL_OPENVG_API);
 109
 110    ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
 111    if (!ctx) {
 112       printf("Error: eglCreateContext failed\n");
 113       exit(1);
 114    }
 115
 116    *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
 117
 118    if (!*surfRet) {
 119       printf("Error: eglCreateWindowSurface failed\n");
 120       exit(1);
 121    }
 122
 123    XFree(visInfo);
 124
 125    *winRet = win;
 126    *ctxRet = ctx;
 127 }
 128
 129 static void
 130 event_loop(Display *dpy, Window win,
 131            EGLDisplay egl_dpy, EGLSurface egl_surf)
 132 {
 133    while (1) {
 134       int redraw = 0;
 135       XEvent event;
 136
 137       XNextEvent(dpy, &event);
 138
 139       switch (event.type) {
 140       case Expose:
 141          redraw = 1;
 142          break;
 143       case ConfigureNotify:
 144          if (reshape) {
 145             width = event.xconfigure.width;
 146             height = event.xconfigure.height;
 147             reshape(event.xconfigure.width, event.xconfigure.height);
 148          }
 149          break;
 150       case KeyPress:
 151       {
 152          char buffer[10];
 153          int r, code;
 154          code = XLookupKeysym(&event.xkey, 0);
 155          if (!keyPress || !keyPress(code)) {
 156             r = XLookupString(&event.xkey, buffer, sizeof(buffer),
 157                               NULL, NULL);
 158             if (buffer[0] == 27) {
 159                /* escape */
 160                return;
 161             }
 162          }
 163       }
 164       redraw = 1;
 165       break;
 166       default:
 167          ; /*no-op*/
 168       }
 169
 170       if (redraw) {
 171          draw();
 172          eglSwapBuffers(egl_dpy, egl_surf);
 173       }
 174    }
 175 }
 176
 177 int window_width(void)
 178 {
 179    return width;
 180 }
 181
 182 int window_height(void)
 183 {
 184    return height;
 185 }
 186
 187 static void
 188 usage(void)
 189 {
 190    printf("Usage:\n");
 191    printf("  -display <displayname>  set the display to run on\n");
 192    printf("  -info                   display OpenGL renderer info\n");
 193 }
 194
 195 int run(int argc, char **argv,
 196         init_func init_f,
 197         reshape_func resh_f,
 198         draw_func draw_f,
 199         key_func key_f)
 200 {
 201    const int winWidth = width, winHeight = height;
 202    Display *x_dpy;
 203    Window win;
 204    EGLSurface egl_surf;
 205    EGLContext egl_ctx;
 206    EGLDisplay egl_dpy;
 207    char *dpyName = NULL;
 208    GLboolean printInfo = GL_FALSE;
 209    EGLint egl_major, egl_minor;
 210    int i;
 211    const char *s;
 212
 213    init = init_f;
 214    draw = draw_f;
 215    reshape = resh_f;
 216    keyPress = key_f;
 217
 218    for (i = 1; i < argc; i++) {
 219       if (strcmp(argv[i], "-display") == 0) {
 220          dpyName = argv[i+1];
 221          i++;
 222       }
 223       else if (strcmp(argv[i], "-info") == 0) {
 224          printInfo = GL_TRUE;
 225       }
 226    }
 227
 228    x_dpy = XOpenDisplay(dpyName);
 229    if (!x_dpy) {
 230       printf("Error: couldn't open display %s\n",
 231              dpyName ? dpyName : getenv("DISPLAY"));
 232       return -1;
 233    }
 234
 235    egl_dpy = eglGetDisplay(x_dpy);
 236    if (!egl_dpy) {
 237       printf("Error: eglGetDisplay() failed\n");
 238       return -1;
 239    }
 240
 241    if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
 242       printf("Error: eglInitialize() failed\n");
 243       return -1;
 244    }
 245
 246    s = eglQueryString(egl_dpy, EGL_VERSION);
 247    printf("EGL_VERSION = %s\n", s);
 248
 249    make_x_window(x_dpy, egl_dpy,
 250                  "OpenVG Example", 0, 0, winWidth, winHeight,
 251                  &win, &egl_ctx, &egl_surf);
 252
 253    XMapWindow(x_dpy, win);
 254    if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
 255       printf("Error: eglMakeCurrent() failed\n");
 256       return -1;
 257    }
 258
 259    if (printInfo) {
 260       printf("VG_RENDERER   = %s\n", (char *) vgGetString(VG_RENDERER));
 261       printf("VG_VERSION    = %s\n", (char *) vgGetString(VG_VERSION));
 262       printf("VG_VENDOR     = %s\n", (char *) vgGetString(VG_VENDOR));
 263    }
 264
 265    if (init)
 266       init();
 267
 268    /* Set initial projection/viewing transformation.
 269     * We can't be sure we'll get a ConfigureNotify event when the window
 270     * first appears.
 271     */
 272    if (reshape)
 273       reshape(winWidth, winHeight);
 274
 275    event_loop(x_dpy, win, egl_dpy, egl_surf);
 276
 277    eglMakeCurrent(egl_dpy, 0, 0, 0);
 278    eglDestroyContext(egl_dpy, egl_ctx);
 279    eglDestroySurface(egl_dpy, egl_surf);
 280    eglTerminate(egl_dpy);
 281
 282
 283    XDestroyWindow(x_dpy, win);
 284    XCloseDisplay(x_dpy);
 285
 286    return 0;
 287 }
 288