progs/xdemos/texture_from_pixmap.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * Test the GLX_EXT_texture_from_pixmap extension
  28  * Brian Paul
  29  * 19 May 2007
  30  */
  31
  32
  33 #define GL_GLEXT_PROTOTYPES
  34 #define GLX_GLXEXT_PROTOTYPES
  35 #include <GL/gl.h>
  36 #include <GL/glx.h>
  37 #include <X11/keysym.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43
  44 static float top, bottom;
  45
  46 static PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT_func = NULL;
  47 static PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT_func = NULL;
  48
  49
  50 static Display *
  51 OpenDisplay(void)
  52 {
  53    int screen;
  54    Display *dpy;
  55    const char *ext;
  56
  57    dpy = XOpenDisplay(NULL);
  58    if (!dpy) {
  59       printf("Couldn't open default display!\n");
  60       exit(1);
  61    }
  62
  63    screen = DefaultScreen(dpy);
  64    ext = glXQueryExtensionsString(dpy, screen);
  65    if (!strstr(ext, "GLX_EXT_texture_from_pixmap")) {
  66       fprintf(stderr, "GLX_EXT_texture_from_pixmap not supported.\n");
  67       exit(1);
  68    }
  69
  70    glXBindTexImageEXT_func = (PFNGLXBINDTEXIMAGEEXTPROC)
  71       glXGetProcAddress((GLubyte *) "glXBindTexImageEXT");
  72    glXReleaseTexImageEXT_func = (PFNGLXRELEASETEXIMAGEEXTPROC)
  73       glXGetProcAddress((GLubyte*) "glXReleaseTexImageEXT");
  74
  75    if (!glXBindTexImageEXT_func || !glXReleaseTexImageEXT_func) {
  76       fprintf(stderr, "glXGetProcAddress failed!\n");
  77       exit(1);
  78    }
  79
  80    return dpy;
  81 }
  82
  83
  84 static GLXFBConfig
  85 ChoosePixmapFBConfig(Display *display)
  86 {
  87    int screen = DefaultScreen(display);
  88    GLXFBConfig *fbconfigs;
  89    int i, nfbconfigs = 0, value;
  90
  91    fbconfigs = glXGetFBConfigs(display, screen, &nfbconfigs);
  92    for (i = 0; i < nfbconfigs; i++) {
  93
  94       glXGetFBConfigAttrib(display, fbconfigs[i], GLX_DRAWABLE_TYPE, &value);
  95       if (!(value & GLX_PIXMAP_BIT))
  96          continue;
  97
  98       glXGetFBConfigAttrib(display, fbconfigs[i],
  99                            GLX_BIND_TO_TEXTURE_TARGETS_EXT, &value);
 100       if (!(value & GLX_TEXTURE_2D_BIT_EXT))
 101          continue;
 102
 103       glXGetFBConfigAttrib(display, fbconfigs[i],
 104                            GLX_BIND_TO_TEXTURE_RGBA_EXT, &value);
 105       if (value == False) {
 106          glXGetFBConfigAttrib(display, fbconfigs[i],
 107                               GLX_BIND_TO_TEXTURE_RGB_EXT, &value);
 108          if (value == False)
 109             continue;
 110       }
 111
 112       glXGetFBConfigAttrib(display, fbconfigs[i],
 113                            GLX_Y_INVERTED_EXT, &value);
 114       if (value == True) {
 115          top = 0.0f;
 116          bottom = 1.0f;
 117       }
 118       else {
 119          top = 1.0f;
 120          bottom = 0.0f;
 121       }
 122
 123       break;
 124    }
 125
 126    if (i == nfbconfigs) {
 127       printf("Unable to find FBconfig for texturing\n");
 128       exit(1);
 129    }
 130
 131    return fbconfigs[i];
 132 }
 133
 134
 135 static GLXPixmap
 136 CreatePixmap(Display *dpy, GLXFBConfig config, int w, int h, Pixmap *p)
 137 {
 138    GLXPixmap gp;
 139    const int pixmapAttribs[] = {
 140       GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
 141       GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
 142       None
 143    };
 144    Window root = RootWindow(dpy, 0);
 145
 146    *p = XCreatePixmap(dpy, root, w, h, 24);
 147    XSync(dpy, 0);
 148    gp = glXCreatePixmap(dpy, config, *p, pixmapAttribs);
 149    XSync(dpy, 0);
 150
 151    return gp;
 152 }
 153
 154
 155 static void
 156 DrawPixmapImage(Display *dpy, Pixmap pm, int w, int h)
 157 {
 158    XGCValues gcvals;
 159    GC gc;
 160
 161    gcvals.background = 0;
 162    gc = XCreateGC(dpy, pm, GCBackground, &gcvals);
 163
 164    XSetForeground(dpy, gc, 0x0);
 165    XFillRectangle(dpy, pm, gc, 0, 0, w, h);
 166
 167    XSetForeground(dpy, gc, 0xff0000);
 168    XFillRectangle(dpy, pm, gc, 0, 0, 50, 50);
 169
 170    XSetForeground(dpy, gc, 0x00ff00);
 171    XFillRectangle(dpy, pm, gc, w - 50, 0, 50, 50);
 172
 173    XSetForeground(dpy, gc, 0x0000ff);
 174    XFillRectangle(dpy, pm, gc, 0, h - 50, 50, 50);
 175
 176    XSetForeground(dpy, gc, 0xffffff);
 177    XFillRectangle(dpy, pm, gc, h - 50, h - 50, 50, 50);
 178
 179    XSetForeground(dpy, gc, 0xffff00);
 180    XSetLineAttributes(dpy, gc, 3, LineSolid, CapButt, JoinBevel);
 181    XDrawLine(dpy, pm, gc, 0, 0, w, h);
 182    XDrawLine(dpy, pm, gc, 0, h, w, 0);
 183
 184    XFreeGC(dpy, gc);
 185 }
 186
 187
 188 static XVisualInfo *
 189 ChooseWindowVisual(Display *dpy)
 190 {
 191    int screen = DefaultScreen(dpy);
 192    XVisualInfo *visinfo;
 193    int attribs[] = {
 194       GLX_RGBA,
 195       GLX_RED_SIZE, 1,
 196       GLX_GREEN_SIZE, 1,
 197       GLX_BLUE_SIZE, 1,
 198       GLX_DOUBLEBUFFER,
 199       None
 200    };
 201
 202    visinfo = glXChooseVisual(dpy, screen, attribs);
 203    if (!visinfo) {
 204       printf("Unable to find RGB, double-buffered visual\n");
 205       exit(1);
 206    }
 207
 208    return visinfo;
 209 }
 210
 211
 212 static Window
 213 CreateWindow(Display *dpy, XVisualInfo *visinfo,
 214              int width, int height, const char *name)
 215 {
 216    int screen = DefaultScreen(dpy);
 217    Window win;
 218    XSetWindowAttributes attr;
 219    unsigned long mask;
 220    Window root;
 221
 222    root = RootWindow(dpy, screen);
 223
 224    /* window attributes */
 225    attr.background_pixel = 0;
 226    attr.border_pixel = 0;
 227    attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
 228    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 229    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 230
 231    win = XCreateWindow(dpy, root, 0, 0, width, height,
 232                         0, visinfo->depth, InputOutput,
 233                         visinfo->visual, mask, &attr);
 234    if (win) {
 235       XSizeHints sizehints;
 236       sizehints.width  = width;
 237       sizehints.height = height;
 238       sizehints.flags = USSize;
 239       XSetNormalHints(dpy, win, &sizehints);
 240       XSetStandardProperties(dpy, win, name, name,
 241                               None, (char **)NULL, 0, &sizehints);
 242
 243       XMapWindow(dpy, win);
 244    }
 245    return win;
 246 }
 247
 248
 249 static void
 250 BindPixmapTexture(Display *dpy, GLXPixmap gp)
 251 {
 252    GLuint texture;
 253
 254    glGenTextures(1, &texture);
 255    glBindTexture(GL_TEXTURE_2D, texture);
 256
 257    glXBindTexImageEXT_func(dpy, gp, GLX_FRONT_LEFT_EXT, NULL);
 258
 259    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 260    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 261
 262    glEnable(GL_TEXTURE_2D);
 263    /*
 264      glXReleaseTexImageEXT_func(display, glxpixmap, GLX_FRONT_LEFT_EXT);
 265    */
 266 }
 267
 268
 269 static void
 270 Resize(Window win, unsigned int width, unsigned int height)
 271 {
 272    float sz = 1.5;
 273    glViewport(0, 0, width, height);
 274    glMatrixMode(GL_PROJECTION);
 275    glLoadIdentity();
 276    glOrtho(-sz, sz, -sz, sz, -1.0, 1.0);
 277    glMatrixMode(GL_MODELVIEW);
 278 }
 279
 280
 281 static void
 282 Redraw(Display *dpy, Window win, float rot)
 283 {
 284    glClearColor(0.25, 0.25, 0.25, 0.0);
 285    glClear(GL_COLOR_BUFFER_BIT);
 286    glPushMatrix();
 287    glRotatef(rot, 0, 0, 1);
 288    glRotatef(2.0 * rot, 1, 0, 0);
 289
 290    glBegin(GL_QUADS);
 291    glTexCoord2d(0.0, bottom);
 292    glVertex2f(-1, -1);
 293    glTexCoord2d(1.0, bottom);
 294    glVertex2f( 1, -1);
 295    glTexCoord2d(1.0, top);
 296    glVertex2d(1.0, 1.0);
 297    glTexCoord2d(0.0, top);
 298    glVertex2f(-1.0, 1.0);
 299    glEnd();
 300
 301    glPopMatrix();
 302
 303    glXSwapBuffers(dpy, win);
 304 }
 305
 306
 307 static void
 308 EventLoop(Display *dpy, Window win)
 309 {
 310    GLfloat rot = 0.0;
 311    int anim = 0;
 312
 313    while (1) {
 314       if (!anim || XPending(dpy) > 0) {
 315          XEvent event;
 316          XNextEvent(dpy, &event);
 317
 318          switch (event.type) {
 319          case Expose:
 320             Redraw(dpy, win, rot);
 321             break;
 322          case ConfigureNotify:
 323             Resize(event.xany.window,
 324                    event.xconfigure.width,
 325                    event.xconfigure.height);
 326             break;
 327          case KeyPress:
 328             {
 329                char buf[100];
 330                KeySym keySym;
 331                XComposeStatus stat;
 332                XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
 333                if (keySym == XK_Escape) {
 334                   return; /* exit */
 335                }
 336                else if (keySym == XK_r) {
 337                   rot += 1.0;
 338                   Redraw(dpy, win, rot);
 339                }
 340                else if (keySym == XK_a) {
 341                   anim = !anim;
 342                }
 343                else if (keySym == XK_R) {
 344                   rot -= 1.0;
 345                   Redraw(dpy, win, rot);
 346                }
 347             }
 348             break;
 349          default:
 350             ; /*no-op*/
 351          }
 352       }
 353       else {
 354          /* animate */
 355          rot += 1.0;
 356          Redraw(dpy, win, rot);
 357       }
 358    }
 359 }
 360
 361
 362
 363 int
 364 main(int argc, char *argv[])
 365 {
 366    Display *dpy;
 367    GLXFBConfig pixmapConfig;
 368    XVisualInfo *windowVis;
 369    GLXPixmap gp;
 370    Window win;
 371    GLXContext ctx;
 372    Pixmap p;
 373
 374    dpy = OpenDisplay();
 375
 376    pixmapConfig = ChoosePixmapFBConfig(dpy);
 377    windowVis = ChooseWindowVisual(dpy);
 378    win = CreateWindow(dpy, windowVis, 500, 500, "Texture From Pixmap");
 379
 380    gp = CreatePixmap(dpy, pixmapConfig, 512, 512, &p);
 381    DrawPixmapImage(dpy, p, 512, 512);
 382
 383    ctx = glXCreateContext(dpy, windowVis, NULL, True);
 384    if (!ctx) {
 385       printf("Couldn't create GLX context\n");
 386       exit(1);
 387    }
 388
 389    glXMakeCurrent(dpy, win, ctx);
 390
 391    BindPixmapTexture(dpy, gp);
 392
 393    EventLoop(dpy, win);
 394
 395    return 0;
 396 }