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 <EGL/egl.h>
14
15
16static init_func    init = 0;
17static draw_func    draw = 0;
18static reshape_func reshape = 0;
19static key_func     keyPress = 0;
20static VGint width = 300, height = 300;
21static EGLint alpha_size = 0;
22
23
24void set_window_alpha_size(int size)
25{
26   alpha_size = size;
27}
28
29void set_window_size(int w, int h)
30{
31   width = w;
32   height = h;
33}
34
35/*
36 * Create an RGB, double-buffered X window.
37 * Return the window and context handles.
38 */
39static void
40make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
41              const char *name,
42              int x, int y, int width, int height,
43              Window *winRet,
44              EGLContext *ctxRet,
45              EGLSurface *surfRet)
46{
47   EGLint attribs[] = {
48      EGL_RED_SIZE, 1,
49      EGL_GREEN_SIZE, 1,
50      EGL_BLUE_SIZE, 1,
51      EGL_ALPHA_SIZE, alpha_size,
52      EGL_RENDERABLE_TYPE, EGL_OPENVG_BIT,
53      EGL_NONE
54   };
55
56   int scrnum;
57   XSetWindowAttributes attr;
58   unsigned long mask;
59   Window root;
60   Window win;
61   XVisualInfo *visInfo, visTemplate;
62   int num_visuals;
63   EGLContext ctx;
64   EGLConfig config;
65   EGLint num_configs;
66   EGLint vid;
67
68   scrnum = DefaultScreen( x_dpy );
69   root = RootWindow( x_dpy, scrnum );
70
71   if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs) ||
72       !num_configs) {
73      printf("Error: couldn't get an EGL visual config\n");
74      exit(1);
75   }
76
77   assert(config);
78
79   if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
80      printf("Error: eglGetConfigAttrib() failed\n");
81      exit(1);
82   }
83
84   /* The X window visual must match the EGL config */
85   visTemplate.visualid = vid;
86   visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
87   if (!visInfo) {
88      printf("Error: couldn't get X visual\n");
89      exit(1);
90   }
91
92   /* window attributes */
93   attr.background_pixel = 0;
94   attr.border_pixel = 0;
95   attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
96   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
97   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
98
99   win = XCreateWindow( x_dpy, root, 0, 0, width, height,
100		        0, visInfo->depth, InputOutput,
101		        visInfo->visual, mask, &attr );
102
103   /* set hints and properties */
104   {
105      XSizeHints sizehints;
106      sizehints.x = x;
107      sizehints.y = y;
108      sizehints.width  = width;
109      sizehints.height = height;
110      sizehints.flags = USSize | USPosition;
111      XSetNormalHints(x_dpy, win, &sizehints);
112      XSetStandardProperties(x_dpy, win, name, name,
113                              None, (char **)NULL, 0, &sizehints);
114   }
115
116   eglBindAPI(EGL_OPENVG_API);
117
118   ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
119   if (!ctx) {
120      printf("Error: eglCreateContext failed\n");
121      exit(1);
122   }
123
124   *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
125
126   if (!*surfRet) {
127      printf("Error: eglCreateWindowSurface failed\n");
128      exit(1);
129   }
130
131   XFree(visInfo);
132
133   *winRet = win;
134   *ctxRet = ctx;
135}
136
137static void
138event_loop(Display *dpy, Window win,
139           EGLDisplay egl_dpy, EGLSurface egl_surf)
140{
141   while (1) {
142      int redraw = 0;
143      XEvent event;
144
145      XNextEvent(dpy, &event);
146
147      switch (event.type) {
148      case Expose:
149         redraw = 1;
150         break;
151      case ConfigureNotify:
152         if (reshape) {
153            width = event.xconfigure.width;
154            height = event.xconfigure.height;
155            reshape(event.xconfigure.width, event.xconfigure.height);
156         }
157         break;
158      case KeyPress:
159      {
160         char buffer[10];
161         int r, code;
162         code = XLookupKeysym(&event.xkey, 0);
163         if (!keyPress || !keyPress(code)) {
164            r = XLookupString(&event.xkey, buffer, sizeof(buffer),
165                              NULL, NULL);
166            if (buffer[0] == 27) {
167               /* escape */
168               return;
169            }
170         }
171      }
172      redraw = 1;
173      break;
174      default:
175         ; /*no-op*/
176      }
177
178      if (redraw) {
179         draw();
180         eglSwapBuffers(egl_dpy, egl_surf);
181      }
182   }
183}
184
185int window_width(void)
186{
187   return width;
188}
189
190int window_height(void)
191{
192   return height;
193}
194
195static void
196usage(void)
197{
198   printf("Usage:\n");
199   printf("  -display <displayname>  set the display to run on\n");
200   printf("  -info                   display OpenGL renderer info\n");
201}
202
203int run(int argc, char **argv,
204        init_func init_f,
205        reshape_func resh_f,
206        draw_func draw_f,
207        key_func key_f)
208{
209   const int winWidth = width, winHeight = height;
210   Display *x_dpy;
211   Window win;
212   EGLSurface egl_surf;
213   EGLContext egl_ctx;
214   EGLDisplay egl_dpy;
215   char *dpyName = NULL;
216   EGLBoolean printInfo = EGL_FALSE;
217   EGLint egl_major, egl_minor;
218   int i;
219   const char *s;
220
221   init = init_f;
222   draw = draw_f;
223   reshape = resh_f;
224   keyPress = key_f;
225
226   for (i = 1; i < argc; i++) {
227      if (strcmp(argv[i], "-display") == 0) {
228         dpyName = argv[i+1];
229         i++;
230      }
231      else if (strcmp(argv[i], "-info") == 0) {
232         printInfo = EGL_TRUE;
233      }
234   }
235
236   x_dpy = XOpenDisplay(dpyName);
237   if (!x_dpy) {
238      printf("Error: couldn't open display %s\n",
239	     dpyName ? dpyName : getenv("DISPLAY"));
240      return -1;
241   }
242
243   egl_dpy = eglGetDisplay(x_dpy);
244   if (!egl_dpy) {
245      printf("Error: eglGetDisplay() failed\n");
246      return -1;
247   }
248
249   if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
250      printf("Error: eglInitialize() failed\n");
251      return -1;
252   }
253
254   s = eglQueryString(egl_dpy, EGL_VERSION);
255   printf("EGL_VERSION = %s\n", s);
256
257   make_x_window(x_dpy, egl_dpy,
258                 "OpenVG Example", 0, 0, winWidth, winHeight,
259                 &win, &egl_ctx, &egl_surf);
260
261   XMapWindow(x_dpy, win);
262   if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
263      printf("Error: eglMakeCurrent() failed\n");
264      return -1;
265   }
266
267   if (printInfo) {
268      printf("VG_RENDERER   = %s\n", (char *) vgGetString(VG_RENDERER));
269      printf("VG_VERSION    = %s\n", (char *) vgGetString(VG_VERSION));
270      printf("VG_VENDOR     = %s\n", (char *) vgGetString(VG_VENDOR));
271   }
272
273   if (init)
274      init();
275
276   /* Set initial projection/viewing transformation.
277    * We can't be sure we'll get a ConfigureNotify event when the window
278    * first appears.
279    */
280   if (reshape)
281      reshape(winWidth, winHeight);
282
283   event_loop(x_dpy, win, egl_dpy, egl_surf);
284
285   eglMakeCurrent(egl_dpy, 0, 0, 0);
286   eglDestroyContext(egl_dpy, egl_ctx);
287   eglDestroySurface(egl_dpy, egl_surf);
288   eglTerminate(egl_dpy);
289
290
291   XDestroyWindow(x_dpy, win);
292   XCloseDisplay(x_dpy);
293
294   return 0;
295}
296
297