progs/egl/opengles1/msaa.c

   1 /*
   2  * Copyright (C) 2008  Brian Paul   All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 /*
  23  * Test MSAA with X/EGL and OpenGL ES 1.x
  24  * Brian Paul
  25  * 15 September 2008
  26  */
  27
  28 #define USE_FULL_GL 0
  29
  30
  31 #include <assert.h>
  32 #include <math.h>
  33 #include <stdlib.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xutil.h>
  38 #include <X11/keysym.h>
  39 #if USE_FULL_GL
  40 #include <GL/gl.h>  /* use full OpenGL */
  41 #else
  42 #include <GLES/gl.h>  /* use OpenGL ES 1.x */
  43 #include <GLES/glext.h>
  44 #endif
  45 #include <EGL/egl.h>
  46
  47
  48
  49 static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
  50 static GLboolean AA = 0*GL_TRUE;
  51
  52
  53 static void
  54 draw(void)
  55 {
  56    float a;
  57
  58    static const GLfloat verts[4][2] = {
  59       { -1, -.1 },
  60       {  1, -.1 },
  61       { -1,  .1 },
  62       {  1,  .1 }
  63    };
  64    static const GLfloat colors[4][4] = {
  65       { 1, 0, 0, 1 },
  66       { 0, 1, 0, 1 },
  67       { 0, 0, 1, 1 },
  68       { 1, 0, 1, 1 }
  69    };
  70
  71    if (AA) {
  72       printf("MSAA enabled\n");
  73       glEnable(GL_MULTISAMPLE);
  74    }
  75    else {
  76       printf("MSAA disabled\n");
  77       glDisable(GL_MULTISAMPLE);
  78    }
  79
  80    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  81
  82    glPushMatrix();
  83    glRotatef(view_rotx, 1, 0, 0);
  84    glRotatef(view_roty, 0, 1, 0);
  85    glRotatef(view_rotz, 0, 0, 1);
  86
  87    {
  88       glVertexPointer(2, GL_FLOAT, 0, verts);
  89       glColorPointer(4, GL_FLOAT, 0, colors);
  90
  91       glEnableClientState(GL_VERTEX_ARRAY);
  92       glEnableClientState(GL_COLOR_ARRAY);
  93
  94       for (a = 0; a < 360; a += 20.0) {
  95          glPushMatrix();
  96
  97          glRotatef(a, 0, 0, 1);
  98          glTranslatef(1.5, 0, 0);
  99
 100          /* draw triangle */
 101          glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 102
 103          glPopMatrix();
 104       }
 105
 106       glDisableClientState(GL_VERTEX_ARRAY);
 107       glDisableClientState(GL_COLOR_ARRAY);
 108    }
 109
 110    glPopMatrix();
 111 }
 112
 113
 114 /* new window size or exposure */
 115 static void
 116 reshape(int width, int height)
 117 {
 118    GLfloat ary = 3.0;
 119    GLfloat arx = ary * (GLfloat) width / (GLfloat) height;
 120
 121    glViewport(0, 0, (GLint) width, (GLint) height);
 122
 123    glMatrixMode(GL_PROJECTION);
 124    glLoadIdentity();
 125 #ifdef GL_VERSION_ES_CM_1_0
 126    glOrthof(-arx, arx, -ary, ary, -1.0, 1.0);
 127 #else
 128    glOrtho(-arx, arx, -ary, ary, -1.0, 1.0);
 129 #endif
 130
 131    glMatrixMode(GL_MODELVIEW);
 132    glLoadIdentity();
 133 }
 134
 135
 136
 137 static void
 138 init(void)
 139 {
 140    printf("Press 'a' to toggle multisample antialiasing\n");
 141    printf("Press 'Esc' to exit\n");
 142 }
 143
 144
 145 /*
 146  * Create an RGB, double-buffered X window.
 147  * Return the window and context handles.
 148  */
 149 static void
 150 make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
 151               const char *name,
 152               int x, int y, int width, int height,
 153               Window *winRet,
 154               EGLContext *ctxRet,
 155               EGLSurface *surfRet)
 156 {
 157    static const EGLint attribs[] = {
 158       EGL_RED_SIZE, 1,
 159       EGL_GREEN_SIZE, 1,
 160       EGL_BLUE_SIZE, 1,
 161       EGL_DEPTH_SIZE, 1,
 162       EGL_SAMPLES, 1,
 163       EGL_SAMPLE_BUFFERS, 1,
 164       EGL_NONE
 165    };
 166
 167    int scrnum;
 168    XSetWindowAttributes attr;
 169    unsigned long mask;
 170    Window root;
 171    Window win;
 172    XVisualInfo *visInfo, visTemplate;
 173    int num_visuals;
 174    EGLContext ctx;
 175    EGLConfig config;
 176    EGLint num_configs;
 177    EGLint vid;
 178
 179    scrnum = DefaultScreen( x_dpy );
 180    root = RootWindow( x_dpy, scrnum );
 181
 182    if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
 183       printf("Error: couldn't get an EGL visual config\n");
 184       exit(1);
 185    }
 186
 187    if (num_configs < 1) {
 188       printf("Error: Unable to find multisample pixel format.\n");
 189       printf("Try running glxinfo to see if your server supports MSAA.\n");
 190       exit(1);
 191    }
 192
 193    if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
 194       printf("Error: eglGetConfigAttrib() failed\n");
 195       exit(1);
 196    }
 197
 198    /* The X window visual must match the EGL config */
 199    visTemplate.visualid = vid;
 200    visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
 201    if (!visInfo) {
 202       printf("Error: couldn't get X visual\n");
 203       exit(1);
 204    }
 205
 206    /* window attributes */
 207    attr.background_pixel = 0;
 208    attr.border_pixel = 0;
 209    attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
 210    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 211    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 212
 213    win = XCreateWindow( x_dpy, root, 0, 0, width, height,
 214                         0, visInfo->depth, InputOutput,
 215                         visInfo->visual, mask, &attr );
 216
 217    /* set hints and properties */
 218    {
 219       XSizeHints sizehints;
 220       sizehints.x = x;
 221       sizehints.y = y;
 222       sizehints.width  = width;
 223       sizehints.height = height;
 224       sizehints.flags = USSize | USPosition;
 225       XSetNormalHints(x_dpy, win, &sizehints);
 226       XSetStandardProperties(x_dpy, win, name, name,
 227                               None, (char **)NULL, 0, &sizehints);
 228    }
 229
 230 #if USE_FULL_GL
 231    eglBindAPI(EGL_OPENGL_API);
 232 #else
 233    eglBindAPI(EGL_OPENGL_ES_API);
 234 #endif
 235
 236    ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
 237    if (!ctx) {
 238       printf("Error: eglCreateContext failed\n");
 239       exit(1);
 240    }
 241
 242    *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
 243
 244    if (!*surfRet) {
 245       printf("Error: eglCreateWindowSurface failed\n");
 246       exit(1);
 247    }
 248
 249    XFree(visInfo);
 250
 251    *winRet = win;
 252    *ctxRet = ctx;
 253 }
 254
 255
 256 static void
 257 event_loop(Display *dpy, Window win,
 258            EGLDisplay egl_dpy, EGLSurface egl_surf)
 259 {
 260    while (1) {
 261       int redraw = 0;
 262       XEvent event;
 263
 264       XNextEvent(dpy, &event);
 265
 266       switch (event.type) {
 267       case Expose:
 268          redraw = 1;
 269          break;
 270       case ConfigureNotify:
 271          reshape(event.xconfigure.width, event.xconfigure.height);
 272          break;
 273       case KeyPress:
 274          {
 275             char buffer[10];
 276             int r, code;
 277             code = XLookupKeysym(&event.xkey, 0);
 278             if (code == XK_Left) {
 279                view_roty += 5.0;
 280             }
 281             else if (code == XK_Right) {
 282                view_roty -= 5.0;
 283             }
 284             else if (code == XK_Up) {
 285                view_rotx += 5.0;
 286             }
 287             else if (code == XK_Down) {
 288                view_rotx -= 5.0;
 289             }
 290             else {
 291                r = XLookupString(&event.xkey, buffer, sizeof(buffer),
 292                                  NULL, NULL);
 293                if (buffer[0] == 'a') {
 294                   AA = !AA;
 295                   redraw = 1;
 296                }
 297                else if (buffer[0] == 27) {
 298                   /* escape */
 299                   return;
 300                }
 301             }
 302          }
 303          redraw = 1;
 304          break;
 305       default:
 306          ; /*no-op*/
 307       }
 308
 309       if (redraw) {
 310          draw();
 311          eglSwapBuffers(egl_dpy, egl_surf);
 312       }
 313    }
 314 }
 315
 316
 317 static void
 318 usage(void)
 319 {
 320    printf("Usage:\n");
 321    printf("  -display <displayname>  set the display to run on\n");
 322    printf("  -info                   display OpenGL renderer info\n");
 323 }
 324
 325
 326 int
 327 main(int argc, char *argv[])
 328 {
 329    const int winWidth = 600, winHeight = 600;
 330    Display *x_dpy;
 331    Window win;
 332    EGLSurface egl_surf;
 333    EGLContext egl_ctx;
 334    EGLDisplay egl_dpy;
 335    char *dpyName = NULL;
 336    GLboolean printInfo = GL_FALSE;
 337    EGLint egl_major, egl_minor;
 338    int i;
 339    const char *s;
 340
 341    static struct {
 342       char *name;
 343       GLenum value;
 344       enum {GetString, GetInteger} type;
 345    } info_items[] = {
 346       {"GL_RENDERER", GL_RENDERER, GetString},
 347       {"GL_VERSION", GL_VERSION, GetString},
 348       {"GL_VENDOR", GL_VENDOR, GetString},
 349       {"GL_EXTENSIONS", GL_EXTENSIONS, GetString},
 350       {"GL_MAX_PALETTE_MATRICES_OES", GL_MAX_PALETTE_MATRICES_OES, GetInteger},
 351       {"GL_MAX_VERTEX_UNITS_OES", GL_MAX_VERTEX_UNITS_OES, GetInteger},
 352    };
 353
 354    for (i = 1; i < argc; i++) {
 355       if (strcmp(argv[i], "-display") == 0) {
 356          dpyName = argv[i+1];
 357          i++;
 358       }
 359       else if (strcmp(argv[i], "-info") == 0) {
 360          printInfo = GL_TRUE;
 361       }
 362       else {
 363          usage();
 364          return -1;
 365       }
 366    }
 367
 368    x_dpy = XOpenDisplay(dpyName);
 369    if (!x_dpy) {
 370       printf("Error: couldn't open display %s\n",
 371              dpyName ? dpyName : getenv("DISPLAY"));
 372       return -1;
 373    }
 374
 375    egl_dpy = eglGetDisplay(x_dpy);
 376    if (!egl_dpy) {
 377       printf("Error: eglGetDisplay() failed\n");
 378       return -1;
 379    }
 380
 381    if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
 382       printf("Error: eglInitialize() failed\n");
 383       return -1;
 384    }
 385
 386    s = eglQueryString(egl_dpy, EGL_VERSION);
 387    printf("EGL_VERSION = %s\n", s);
 388
 389    s = eglQueryString(egl_dpy, EGL_VENDOR);
 390    printf("EGL_VENDOR = %s\n", s);
 391
 392    s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
 393    printf("EGL_EXTENSIONS = %s\n", s);
 394
 395    s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
 396    printf("EGL_CLIENT_APIS = %s\n", s);
 397
 398    make_x_window(x_dpy, egl_dpy,
 399                  "msaa", 0, 0, winWidth, winHeight,
 400                  &win, &egl_ctx, &egl_surf);
 401
 402    XMapWindow(x_dpy, win);
 403    if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
 404       printf("Error: eglMakeCurrent() failed\n");
 405       return -1;
 406    }
 407
 408    if (printInfo) {
 409       for (i = 0; i < sizeof(info_items)/sizeof(info_items[0]); i++) {
 410          switch (info_items[i].type) {
 411             case GetString:
 412                printf("%s = %s\n", info_items[i].name, (char *)glGetString(info_items[i].value));
 413                break;
 414             case GetInteger: {
 415                GLint rv = -1;
 416                glGetIntegerv(info_items[i].value, &rv);
 417                printf("%s = %d\n", info_items[i].name, rv);
 418                break;
 419             }
 420          }
 421       }
 422    };
 423    init();
 424
 425    /* Set initial projection/viewing transformation.
 426     * We can't be sure we'll get a ConfigureNotify event when the window
 427     * first appears.
 428     */
 429    reshape(winWidth, winHeight);
 430
 431    event_loop(x_dpy, win, egl_dpy, egl_surf);
 432
 433    eglDestroyContext(egl_dpy, egl_ctx);
 434    eglDestroySurface(egl_dpy, egl_surf);
 435    eglTerminate(egl_dpy);
 436
 437
 438    XDestroyWindow(x_dpy, win);
 439    XCloseDisplay(x_dpy);
 440
 441    return 0;
 442 }