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
44static float top, bottom;
45
46static PFNGLXBINDTEXIMAGEEXTPROC glXBindTexImageEXT_func = NULL;
47static PFNGLXRELEASETEXIMAGEEXTPROC glXReleaseTexImageEXT_func = NULL;
48
49
50static Display *
51OpenDisplay(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
84static GLXFBConfig
85ChoosePixmapFBConfig(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
135static GLXPixmap
136CreatePixmap(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
155static void
156DrawPixmapImage(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
188static XVisualInfo *
189ChooseWindowVisual(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
212static Window
213CreateWindow(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
249static void
250BindPixmapTexture(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
269static void
270Resize(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
281static void
282Redraw(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
307static void
308EventLoop(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
363int
364main(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}
397