apple_glx_pbuffer.c revision f5aa5377a52c50c94b6a6d6d48c0057dbe874692 
1/*
2 Copyright (c) 2009 Apple Inc.
3
4 Permission is hereby granted, free of charge, to any person
5 obtaining a copy of this software and associated documentation files
6 (the "Software"), to deal in the Software without restriction,
7 including without limitation the rights to use, copy, modify, merge,
8 publish, distribute, sublicense, and/or sell copies of the Software,
9 and to permit persons to whom the Software is furnished to do so,
10 subject to the following conditions:
11
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
19 HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
23
24 Except as contained in this notice, the name(s) of the above
25 copyright holders shall not be used in advertising or otherwise to
26 promote the sale, use or other dealings in this Software without
27 prior written authorization.
28*/
29
30#include <stdlib.h>
31#include <pthread.h>
32#include <assert.h>
33#include <GL/glew.h>
34#include "apple_glx.h"
35#include "glcontextmodes.h"
36#include "apple_glx_context.h"
37#include "apple_glx_drawable.h"
38#include "apple_cgl.h"
39
40static bool pbuffer_make_current(struct apple_glx_context *ac,
41                                 struct apple_glx_drawable *d);
42
43static void pbuffer_destroy(Display * dpy, struct apple_glx_drawable *d);
44
45static struct apple_glx_drawable_callbacks callbacks = {
46   .type = APPLE_GLX_DRAWABLE_PBUFFER,
47   .make_current = pbuffer_make_current,
48   .destroy = pbuffer_destroy
49};
50
51
52/* Return true if an error occurred. */
53bool
54pbuffer_make_current(struct apple_glx_context *ac,
55                     struct apple_glx_drawable *d)
56{
57   struct apple_glx_pbuffer *pbuf = &d->types.pbuffer;
58   CGLError cglerr;
59
60   assert(APPLE_GLX_DRAWABLE_PBUFFER == d->type);
61
62   cglerr = apple_cgl.set_pbuffer(ac->context_obj, pbuf->buffer_obj, 0, 0, 0);
63
64   if (kCGLNoError != cglerr) {
65      fprintf(stderr, "set_pbuffer: %s\n", apple_cgl.error_string(cglerr));
66      return true;
67   }
68
69   if (!ac->made_current) {
70      glViewport(0, 0, pbuf->width, pbuf->height);
71      glScissor(0, 0, pbuf->width, pbuf->height);
72      ac->made_current = true;
73   }
74
75   apple_glx_diagnostic("made pbuffer drawable 0x%lx current\n", d->drawable);
76
77   return false;
78}
79
80void
81pbuffer_destroy(Display * dpy, struct apple_glx_drawable *d)
82{
83   struct apple_glx_pbuffer *pbuf = &d->types.pbuffer;
84
85   assert(APPLE_GLX_DRAWABLE_PBUFFER == d->type);
86
87   apple_glx_diagnostic("destroying pbuffer for drawable 0x%lx\n",
88                        d->drawable);
89
90   apple_cgl.destroy_pbuffer(pbuf->buffer_obj);
91   XFreePixmap(dpy, pbuf->xid);
92}
93
94/* Return true if an error occurred. */
95bool
96apple_glx_pbuffer_destroy(Display * dpy, GLXPbuffer pbuf)
97{
98   return !apple_glx_drawable_destroy_by_type(dpy, pbuf,
99                                              APPLE_GLX_DRAWABLE_PBUFFER);
100}
101
102/* Return true if an error occurred. */
103bool
104apple_glx_pbuffer_create(Display * dpy, GLXFBConfig config,
105                         int width, int height, int *errorcode,
106                         GLXPbuffer * result)
107{
108   struct apple_glx_drawable *d;
109   struct apple_glx_pbuffer *pbuf = NULL;
110   CGLError err;
111   Window root;
112   int screen;
113   Pixmap xid;
114   __GLcontextModes *modes = (__GLcontextModes *) config;
115
116   root = DefaultRootWindow(dpy);
117   screen = DefaultScreen(dpy);
118
119   /*
120    * This pixmap is only used for a persistent XID.
121    * The XC-MISC extension cleans up XIDs and reuses them transparently,
122    * so we need to retain a server-side reference.
123    */
124   xid = XCreatePixmap(dpy, root, (unsigned int) 1,
125                       (unsigned int) 1, DefaultDepth(dpy, screen));
126
127   if (None == xid) {
128      *errorcode = BadAlloc;
129      return true;
130   }
131
132   if (apple_glx_drawable_create(dpy, screen, xid, &d, &callbacks)) {
133      *errorcode = BadAlloc;
134      return true;
135   }
136
137   /* The lock is held in d from create onward. */
138   pbuf = &d->types.pbuffer;
139
140   pbuf->xid = xid;
141   pbuf->width = width;
142   pbuf->height = height;
143
144   err = apple_cgl.create_pbuffer(width, height, GL_TEXTURE_RECTANGLE_EXT,
145                                  (modes->alphaBits > 0) ? GL_RGBA : GL_RGB,
146                                  0, &pbuf->buffer_obj);
147
148   if (kCGLNoError != err) {
149      d->unlock(d);
150      d->destroy(d);
151      *errorcode = BadMatch;
152      return true;
153   }
154
155   pbuf->fbconfigID = modes->fbconfigID;
156
157   pbuf->event_mask = 0;
158
159   *result = pbuf->xid;
160
161   d->unlock(d);
162
163   return false;
164}
165
166
167
168/* Return true if an error occurred. */
169static bool
170get_max_size(int *widthresult, int *heightresult)
171{
172   CGLContextObj oldcontext;
173   GLint ar[2];
174
175   oldcontext = apple_cgl.get_current_context();
176
177   if (!oldcontext) {
178      /*
179       * There is no current context, so we need to make one in order
180       * to call glGetInteger.
181       */
182      CGLPixelFormatObj pfobj;
183      CGLError err;
184      CGLPixelFormatAttribute attr[10];
185      int c = 0;
186      GLint vsref = 0;
187      CGLContextObj newcontext;
188
189      attr[c++] = kCGLPFAColorSize;
190      attr[c++] = 32;
191      attr[c++] = 0;
192
193      err = apple_cgl.choose_pixel_format(attr, &pfobj, &vsref);
194      if (kCGLNoError != err) {
195         if (getenv("LIBGL_DIAGNOSTIC")) {
196            printf("choose_pixel_format error in %s: %s\n", __func__,
197                   apple_cgl.error_string(err));
198         }
199
200         return true;
201      }
202
203
204      err = apple_cgl.create_context(pfobj, NULL, &newcontext);
205
206      if (kCGLNoError != err) {
207         if (getenv("LIBGL_DIAGNOSTIC")) {
208            printf("create_context error in %s: %s\n", __func__,
209                   apple_cgl.error_string(err));
210         }
211
212         apple_cgl.destroy_pixel_format(pfobj);
213
214         return true;
215      }
216
217      err = apple_cgl.set_current_context(newcontext);
218
219      if (kCGLNoError != err) {
220         printf("set_current_context error in %s: %s\n", __func__,
221                apple_cgl.error_string(err));
222         return true;
223      }
224
225
226      glGetIntegerv(GL_MAX_VIEWPORT_DIMS, ar);
227
228      apple_cgl.set_current_context(oldcontext);
229      apple_cgl.destroy_context(newcontext);
230      apple_cgl.destroy_pixel_format(pfobj);
231   }
232   else {
233      /* We have a valid context. */
234
235      glGetIntegerv(GL_MAX_VIEWPORT_DIMS, ar);
236   }
237
238   *widthresult = ar[0];
239   *heightresult = ar[1];
240
241   return false;
242}
243
244bool
245apple_glx_pbuffer_query(GLXPbuffer p, int attr, unsigned int *value)
246{
247   bool result = false;
248   struct apple_glx_drawable *d;
249   struct apple_glx_pbuffer *pbuf;
250
251   d = apple_glx_drawable_find_by_type(p, APPLE_GLX_DRAWABLE_PBUFFER,
252                                       APPLE_GLX_DRAWABLE_LOCK);
253
254   if (d) {
255      pbuf = &d->types.pbuffer;
256
257      switch (attr) {
258      case GLX_WIDTH:
259         *value = pbuf->width;
260         result = true;
261         break;
262
263      case GLX_HEIGHT:
264         *value = pbuf->height;
265         result = true;
266         break;
267
268      case GLX_PRESERVED_CONTENTS:
269         *value = true;
270         result = true;
271         break;
272
273      case GLX_LARGEST_PBUFFER:{
274            int width, height;
275            if (get_max_size(&width, &height)) {
276               fprintf(stderr, "internal error: "
277                       "unable to find the largest pbuffer!\n");
278            }
279            else {
280               *value = width;
281               result = true;
282            }
283         }
284         break;
285
286      case GLX_FBCONFIG_ID:
287         *value = pbuf->fbconfigID;
288         result = true;
289         break;
290      }
291
292      d->unlock(d);
293   }
294
295   return result;
296}
297
298bool
299apple_glx_pbuffer_set_event_mask(GLXDrawable drawable, unsigned long mask)
300{
301   struct apple_glx_drawable *d;
302   bool result = false;
303
304   d = apple_glx_drawable_find_by_type(drawable, APPLE_GLX_DRAWABLE_PBUFFER,
305                                       APPLE_GLX_DRAWABLE_LOCK);
306
307   if (d) {
308      d->types.pbuffer.event_mask = mask;
309      result = true;
310      d->unlock(d);
311   }
312
313   return result;
314}
315
316bool
317apple_glx_pbuffer_get_event_mask(GLXDrawable drawable, unsigned long *mask)
318{
319   struct apple_glx_drawable *d;
320   bool result = false;
321
322   d = apple_glx_drawable_find_by_type(drawable, APPLE_GLX_DRAWABLE_PBUFFER,
323                                       APPLE_GLX_DRAWABLE_LOCK);
324   if (d) {
325      *mask = d->types.pbuffer.event_mask;
326      result = true;
327      d->unlock(d);
328   }
329
330   return result;
331}
332