101a0de81bd6d28ac288e1426fb7a39d413348c5
[vlc.git] / modules / video_output / opengl.c
1 /*****************************************************************************
2  * opengl.c: OpenGL video output
3  *****************************************************************************
4  * Copyright (C) 2004 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Cyril Deguet <asmax@videolan.org>
8  *          Gildas Bazin <gbazin@videolan.org>
9  *          Eric Petit <titer@m0k.org>
10  *          Cedric Cocquebert <cedric.cocquebert@supelec.fr>
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25  *****************************************************************************/
26
27 /*****************************************************************************
28  * Preamble
29  *****************************************************************************/
30
31 #ifdef HAVE_CONFIG_H
32 # include "config.h"
33 #endif
34
35 #include <errno.h>                                                 /* ENOMEM */
36
37 #include <vlc_common.h>
38 #include <vlc_plugin.h>
39 #include <vlc_vout.h>
40
41 #ifdef __APPLE__
42 #include <OpenGL/gl.h>
43 #include <OpenGL/glext.h>
44
45 /* On OS X, use GL_TEXTURE_RECTANGLE_EXT instead of GL_TEXTURE_2D.
46    This allows sizes which are not powers of 2 */
47 #define VLCGL_TARGET GL_TEXTURE_RECTANGLE_EXT
48
49 /* OS X OpenGL supports YUV. Hehe. */
50 #define VLCGL_FORMAT GL_YCBCR_422_APPLE
51 #define VLCGL_TYPE   GL_UNSIGNED_SHORT_8_8_APPLE
52 #else
53
54 #include <GL/gl.h>
55 #define VLCGL_TARGET GL_TEXTURE_2D
56
57 /* RV16 */
58 #ifndef GL_UNSIGNED_SHORT_5_6_5
59 #define GL_UNSIGNED_SHORT_5_6_5 0x8363
60 #endif
61 //#define VLCGL_RGB_FORMAT GL_RGB
62 //#define VLCGL_RGB_TYPE GL_UNSIGNED_SHORT_5_6_5
63
64 /* RV24 */
65 //#define VLCGL_RGB_FORMAT GL_RGB
66 //#define VLCGL_RGB_TYPE GL_UNSIGNED_BYTE
67
68 /* RV32 */
69 #define VLCGL_RGB_FORMAT GL_RGBA
70 #define VLCGL_RGB_TYPE GL_UNSIGNED_BYTE
71
72 /* YUY2 */
73 #ifndef YCBCR_MESA
74 #define YCBCR_MESA 0x8757
75 #endif
76 #ifndef UNSIGNED_SHORT_8_8_MESA
77 #define UNSIGNED_SHORT_8_8_MESA 0x85BA
78 #endif
79 #define VLCGL_YUV_FORMAT YCBCR_MESA
80 #define VLCGL_YUV_TYPE UNSIGNED_SHORT_8_8_MESA
81
82 /* Use RGB on Win32/GLX */
83 #define VLCGL_FORMAT VLCGL_RGB_FORMAT
84 #define VLCGL_TYPE   VLCGL_RGB_TYPE
85 //#define VLCGL_FORMAT VLCGL_YUV_FORMAT
86 //#define VLCGL_TYPE   VLCGL_YUV_TYPE
87 #endif
88
89 #ifndef GL_CLAMP_TO_EDGE
90 #   define GL_CLAMP_TO_EDGE 0x812F
91 #endif
92
93 /*****************************************************************************
94  * Vout interface
95  *****************************************************************************/
96 static int  CreateVout   ( vlc_object_t * );
97 static void DestroyVout  ( vlc_object_t * );
98 static int  Init         ( vout_thread_t * );
99 static void End          ( vout_thread_t * );
100 static int  Manage       ( vout_thread_t * );
101 static void Render       ( vout_thread_t *, picture_t * );
102 static void DisplayVideo ( vout_thread_t *, picture_t * );
103 static int  Control      ( vout_thread_t *, int, va_list );
104
105 static inline int GetAlignedSize( int );
106
107 static int InitTextures  ( vout_thread_t * );
108 static int SendEvents    ( vlc_object_t *, char const *,
109                            vlc_value_t, vlc_value_t, void * );
110
111 #define PROVIDER_TEXT N_("OpenGL Provider")
112 #define PROVIDER_LONGTEXT N_("Allows you to modify what OpenGL provider should be used")
113
114 vlc_module_begin ()
115     set_shortname( "OpenGL" )
116     set_category( CAT_VIDEO )
117     set_subcategory( SUBCAT_VIDEO_VOUT )
118     set_description( N_("OpenGL video output") )
119 #ifdef __APPLE__
120     set_capability( "video output", 200 )
121 #else
122     set_capability( "video output", 20 )
123 #endif
124     add_shortcut( "opengl" )
125     /* Allow opengl provider plugin selection */
126     add_string( "opengl-provider", "default", NULL, PROVIDER_TEXT, 
127                     PROVIDER_LONGTEXT, true )
128     set_callbacks( CreateVout, DestroyVout )
129 vlc_module_end ()
130
131 /*****************************************************************************
132  * vout_sys_t: video output method descriptor
133  *****************************************************************************
134  * This structure is part of the video output thread descriptor.
135  * It describes the OpenGL specific properties of the output thread.
136  *****************************************************************************/
137 struct vout_sys_t
138 {
139     vout_thread_t *p_vout;
140
141     uint8_t    *pp_buffer[2];
142     int         i_index;
143     int         i_tex_width;
144     int         i_tex_height;
145     GLuint      p_textures[2];
146 };
147
148 /*****************************************************************************
149  * CreateVout: This function allocates and initializes the OpenGL vout method.
150  *****************************************************************************/
151 static int CreateVout( vlc_object_t *p_this )
152 {
153     vout_thread_t *p_vout = (vout_thread_t *)p_this;
154     vout_sys_t *p_sys;
155     char * psz;
156
157     /* Allocate structure */
158     p_vout->p_sys = p_sys = malloc( sizeof( vout_sys_t ) );
159     if( p_sys == NULL )
160         return VLC_ENOMEM;
161
162     p_sys->i_index = 0;
163 #ifdef __APPLE__
164     p_sys->i_tex_width  = p_vout->fmt_in.i_width;
165     p_sys->i_tex_height = p_vout->fmt_in.i_height;
166 #else
167     /* A texture must have a size aligned on a power of 2 */
168     p_sys->i_tex_width  = GetAlignedSize( p_vout->fmt_in.i_width );
169     p_sys->i_tex_height = GetAlignedSize( p_vout->fmt_in.i_height );
170 #endif
171
172     msg_Dbg( p_vout, "Texture size: %dx%d", p_sys->i_tex_width,
173              p_sys->i_tex_height );
174
175     /* Get window */
176     p_sys->p_vout =
177         (vout_thread_t *)vlc_object_create( p_this, sizeof( vout_thread_t ) );
178     if( p_sys->p_vout == NULL )
179     {
180         free( p_sys );
181         return VLC_ENOMEM;
182     }
183     vlc_object_attach( p_sys->p_vout, p_this );
184
185     p_sys->p_vout->i_window_width = p_vout->i_window_width;
186     p_sys->p_vout->i_window_height = p_vout->i_window_height;
187     p_sys->p_vout->b_fullscreen = p_vout->b_fullscreen;
188     p_sys->p_vout->render.i_width = p_vout->render.i_width;
189     p_sys->p_vout->render.i_height = p_vout->render.i_height;
190     p_sys->p_vout->render.i_aspect = p_vout->render.i_aspect;
191     p_sys->p_vout->fmt_render = p_vout->fmt_render;
192     p_sys->p_vout->fmt_in = p_vout->fmt_in;
193     p_sys->p_vout->b_autoscale = p_vout->b_autoscale;
194     p_sys->p_vout->i_zoom = p_vout->i_zoom;
195     p_sys->p_vout->i_alignment = p_vout->i_alignment;
196
197     psz = config_GetPsz( p_vout, "opengl-provider" );
198
199     msg_Dbg( p_vout, "requesting \"%s\" opengl provider",
200                       psz ? psz : "default" );
201
202     p_sys->p_vout->p_module =
203         module_need( p_sys->p_vout, "opengl provider", psz, false );
204     free( psz );
205     if( p_sys->p_vout->p_module == NULL )
206     {
207         msg_Warn( p_vout, "No OpenGL provider found" );
208         vlc_object_detach( p_sys->p_vout );
209         vlc_object_release( p_sys->p_vout );
210         return VLC_ENOOBJ;
211     }
212
213     p_vout->pf_init = Init;
214     p_vout->pf_end = End;
215     p_vout->pf_manage = Manage;
216     p_vout->pf_render = Render;
217     p_vout->pf_display = DisplayVideo;
218     p_vout->pf_control = Control;
219
220     /* Forward events from the opengl provider */
221     var_Create( p_sys->p_vout, "mouse-x", VLC_VAR_INTEGER );
222     var_Create( p_sys->p_vout, "mouse-y", VLC_VAR_INTEGER );
223     var_Create( p_sys->p_vout, "mouse-moved", VLC_VAR_BOOL );
224     var_Create( p_sys->p_vout, "mouse-clicked", VLC_VAR_BOOL );
225     var_Create( p_sys->p_vout, "mouse-button-down", VLC_VAR_INTEGER );
226     var_Create( p_sys->p_vout, "video-on-top",
227                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
228
229     var_AddCallback( p_sys->p_vout, "mouse-x", SendEvents, p_vout );
230     var_AddCallback( p_sys->p_vout, "mouse-y", SendEvents, p_vout );
231     var_AddCallback( p_sys->p_vout, "mouse-moved", SendEvents, p_vout );
232     var_AddCallback( p_sys->p_vout, "mouse-clicked", SendEvents, p_vout );
233     var_AddCallback( p_sys->p_vout, "mouse-button-down", SendEvents, p_vout );
234
235     return VLC_SUCCESS;
236 }
237
238 /*****************************************************************************
239  * Init: initialize the OpenGL video thread output method
240  *****************************************************************************/
241 static int Init( vout_thread_t *p_vout )
242 {
243     vout_sys_t *p_sys = p_vout->p_sys;
244     int i_pixel_pitch;
245
246     p_sys->p_vout->pf_init( p_sys->p_vout );
247
248 /* TODO: We use YCbCr on Mac which is Y422, but on OSX it seems to == YUY2. Verify */
249 #if ( defined( WORDS_BIGENDIAN ) && VLCGL_FORMAT == GL_YCBCR_422_APPLE ) || (VLCGL_FORMAT == YCBCR_MESA)
250     p_vout->output.i_chroma = VLC_FOURCC('Y','U','Y','2');
251     i_pixel_pitch = 2;
252
253 #elif (VLCGL_FORMAT == GL_YCBCR_422_APPLE)
254     p_vout->output.i_chroma = VLC_FOURCC('U','Y','V','Y');
255     i_pixel_pitch = 2;
256
257 #elif VLCGL_FORMAT == GL_RGB
258 #   if VLCGL_TYPE == GL_UNSIGNED_BYTE
259     p_vout->output.i_chroma = VLC_FOURCC('R','V','2','4');
260 #       if defined( WORDS_BIGENDIAN )
261     p_vout->output.i_rmask = 0x00ff0000;
262     p_vout->output.i_gmask = 0x0000ff00;
263     p_vout->output.i_bmask = 0x000000ff;
264 #       else
265     p_vout->output.i_rmask = 0x000000ff;
266     p_vout->output.i_gmask = 0x0000ff00;
267     p_vout->output.i_bmask = 0x00ff0000;
268 #       endif
269     i_pixel_pitch = 3;
270 #   else
271     p_vout->output.i_chroma = VLC_FOURCC('R','V','1','6');
272 #       if defined( WORDS_BIGENDIAN )
273     p_vout->output.i_rmask = 0x001f;
274     p_vout->output.i_gmask = 0x07e0;
275     p_vout->output.i_bmask = 0xf800;
276 #       else
277     p_vout->output.i_rmask = 0xf800;
278     p_vout->output.i_gmask = 0x07e0;
279     p_vout->output.i_bmask = 0x001f;
280 #       endif
281     i_pixel_pitch = 2;
282 #   endif
283 #else
284     p_vout->output.i_chroma = VLC_FOURCC('R','V','3','2');
285 #       if defined( WORDS_BIGENDIAN )
286     p_vout->output.i_rmask = 0xff000000;
287     p_vout->output.i_gmask = 0x00ff0000;
288     p_vout->output.i_bmask = 0x0000ff00;
289 #       else
290     p_vout->output.i_rmask = 0x000000ff;
291     p_vout->output.i_gmask = 0x0000ff00;
292     p_vout->output.i_bmask = 0x00ff0000;
293 #       endif
294     i_pixel_pitch = 4;
295 #endif
296
297     /* Since OpenGL can do rescaling for us, stick to the default
298      * coordinates and aspect. */
299     p_vout->output.i_width  = p_vout->render.i_width;
300     p_vout->output.i_height = p_vout->render.i_height;
301     p_vout->output.i_aspect = p_vout->render.i_aspect;
302
303     p_vout->fmt_out = p_vout->fmt_in;
304     p_vout->fmt_out.i_chroma = p_vout->output.i_chroma;
305
306     /* We know the chroma, allocate one buffer which will be used
307      * directly by the decoder */
308     p_sys->pp_buffer[0] =
309         malloc( p_sys->i_tex_width * p_sys->i_tex_height * i_pixel_pitch );
310     if( !p_sys->pp_buffer[0] )
311         return -1;
312     p_sys->pp_buffer[1] =
313         malloc( p_sys->i_tex_width * p_sys->i_tex_height * i_pixel_pitch );
314     if( !p_sys->pp_buffer[1] )
315         return -1;
316
317     p_vout->p_picture[0].i_planes = 1;
318     p_vout->p_picture[0].p->p_pixels = p_sys->pp_buffer[0];
319     p_vout->p_picture[0].p->i_lines = p_vout->output.i_height;
320     p_vout->p_picture[0].p->i_visible_lines = p_vout->output.i_height;
321     p_vout->p_picture[0].p->i_pixel_pitch = i_pixel_pitch;
322     p_vout->p_picture[0].p->i_pitch = p_vout->output.i_width *
323         p_vout->p_picture[0].p->i_pixel_pitch;
324     p_vout->p_picture[0].p->i_visible_pitch = p_vout->output.i_width *
325         p_vout->p_picture[0].p->i_pixel_pitch;
326
327     p_vout->p_picture[0].i_status = DESTROYED_PICTURE;
328     p_vout->p_picture[0].i_type   = DIRECT_PICTURE;
329
330     PP_OUTPUTPICTURE[ 0 ] = &p_vout->p_picture[0];
331
332     I_OUTPUTPICTURES = 1;
333
334     if( p_sys->p_vout->pf_lock &&
335         p_sys->p_vout->pf_lock( p_sys->p_vout ) )
336     {
337         msg_Warn( p_vout, "could not lock OpenGL provider" );
338         return 0;
339     }
340
341     InitTextures( p_vout );
342
343     glDisable(GL_BLEND);
344     glDisable(GL_DEPTH_TEST);
345     glDepthMask(GL_FALSE);
346     glDisable(GL_CULL_FACE);
347     glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
348     glClear( GL_COLOR_BUFFER_BIT );
349
350     if( p_sys->p_vout->pf_unlock )
351     {
352         p_sys->p_vout->pf_unlock( p_sys->p_vout );
353     }
354
355     return 0;
356 }
357
358 /*****************************************************************************
359  * End: terminate GLX video thread output method
360  *****************************************************************************/
361 static void End( vout_thread_t *p_vout )
362 {
363     vout_sys_t *p_sys = p_vout->p_sys;
364
365     if( p_sys->p_vout->pf_lock &&
366         p_sys->p_vout->pf_lock( p_sys->p_vout ) )
367     {
368         msg_Warn( p_vout, "could not lock OpenGL provider" );
369         return;
370     }
371
372     glFinish();
373     glFlush();
374
375     /* Free the texture buffer*/
376     glDeleteTextures( 2, p_sys->p_textures );
377     free( p_sys->pp_buffer[0] );
378     free( p_sys->pp_buffer[1] );
379
380     if( p_sys->p_vout->pf_unlock )
381     {
382         p_sys->p_vout->pf_unlock( p_sys->p_vout );
383     }
384 }
385
386 /*****************************************************************************
387  * Destroy: destroy GLX video thread output method
388  *****************************************************************************
389  * Terminate an output method created by CreateVout
390  *****************************************************************************/
391 static void DestroyVout( vlc_object_t *p_this )
392 {
393     vout_thread_t *p_vout = (vout_thread_t *)p_this;
394     vout_sys_t *p_sys = p_vout->p_sys;
395
396     module_unneed( p_sys->p_vout, p_sys->p_vout->p_module );
397     vlc_object_release( p_sys->p_vout );
398
399     free( p_sys );
400 }
401
402 /*****************************************************************************
403  * Manage: handle Sys events
404  *****************************************************************************
405  * This function should be called regularly by video output thread. It returns
406  * a non null value if an error occurred.
407  *****************************************************************************/
408 static int Manage( vout_thread_t *p_vout )
409 {
410     vout_sys_t *p_sys = p_vout->p_sys;
411     int i_ret, i_fullscreen_change;
412
413     i_fullscreen_change = ( p_vout->i_changes & VOUT_FULLSCREEN_CHANGE );
414
415     p_vout->fmt_out.i_x_offset = p_sys->p_vout->fmt_in.i_x_offset =
416         p_vout->fmt_in.i_x_offset;
417     p_vout->fmt_out.i_y_offset = p_sys->p_vout->fmt_in.i_y_offset =
418         p_vout->fmt_in.i_y_offset;
419     p_vout->fmt_out.i_visible_width = p_sys->p_vout->fmt_in.i_visible_width =
420         p_vout->fmt_in.i_visible_width;
421     p_vout->fmt_out.i_visible_height = p_sys->p_vout->fmt_in.i_visible_height =
422         p_vout->fmt_in.i_visible_height;
423     p_vout->fmt_out.i_aspect = p_sys->p_vout->fmt_in.i_aspect =
424         p_vout->fmt_in.i_aspect;
425     p_vout->fmt_out.i_sar_num = p_sys->p_vout->fmt_in.i_sar_num =
426         p_vout->fmt_in.i_sar_num;
427     p_vout->fmt_out.i_sar_den = p_sys->p_vout->fmt_in.i_sar_den =
428         p_vout->fmt_in.i_sar_den;
429     p_vout->output.i_aspect = p_vout->fmt_in.i_aspect;
430
431     p_sys->p_vout->i_changes = p_vout->i_changes;
432     i_ret = p_sys->p_vout->pf_manage( p_sys->p_vout );
433     p_vout->i_changes = p_sys->p_vout->i_changes;
434
435 #ifdef __APPLE__
436     if( p_sys->p_vout->pf_lock &&
437         p_sys->p_vout->pf_lock( p_sys->p_vout ) )
438     {
439         msg_Warn( p_vout, "could not lock OpenGL provider" );
440         return i_ret;
441     }
442
443     /* On OS X, we create the window and the GL view when entering
444        fullscreen - the textures have to be inited again */
445     if( i_fullscreen_change )
446     {
447         InitTextures( p_vout );
448     }
449
450     if( p_sys->p_vout->pf_unlock )
451     {
452         p_sys->p_vout->pf_unlock( p_sys->p_vout );
453     }
454 #endif
455 // to align in real time in OPENGL
456     if (p_sys->p_vout->i_alignment != p_vout->i_alignment)
457     {
458         p_vout->i_changes = VOUT_CROP_CHANGE;        //to force change
459         p_sys->p_vout->i_alignment = p_vout->i_alignment;    
460     }
461     return i_ret;
462 }
463
464 /*****************************************************************************
465  * Render: render previously calculated output
466  *****************************************************************************/
467 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
468 {
469     VLC_UNUSED(p_pic);
470     vout_sys_t *p_sys = p_vout->p_sys;
471
472     /* On Win32/GLX, we do this the usual way:
473        + Fill the buffer with new content,
474        + Reload the texture,
475        + Use the texture.
476
477        On OS X with VRAM or AGP texturing, the order has to be:
478        + Reload the texture,
479        + Fill the buffer with new content,
480        + Use the texture.
481
482        (Thanks to gcc from the Arstechnica forums for the tip)
483
484        Therefore, we have to use two buffers and textures. On Win32/GLX,
485        we reload the texture to be displayed and use it right away. On
486        OS X, we first render, then reload the texture to be used next
487        time. */
488
489     if( p_sys->p_vout->pf_lock &&
490         p_sys->p_vout->pf_lock( p_sys->p_vout ) )
491     {
492         msg_Warn( p_vout, "could not lock OpenGL provider" );
493         return;
494     }
495
496 #ifdef __APPLE__
497     int i_new_index;
498     i_new_index = ( p_sys->i_index + 1 ) & 1;
499
500
501     /* Update the texture */
502     glBindTexture( VLCGL_TARGET, p_sys->p_textures[i_new_index] );
503     glTexSubImage2D( VLCGL_TARGET, 0, 0, 0,
504                      p_vout->fmt_out.i_width,
505                      p_vout->fmt_out.i_height,
506                      VLCGL_FORMAT, VLCGL_TYPE, p_sys->pp_buffer[i_new_index] );
507
508     /* Bind to the previous texture for drawing */
509     glBindTexture( VLCGL_TARGET, p_sys->p_textures[p_sys->i_index] );
510
511     /* Switch buffers */
512     p_sys->i_index = i_new_index;
513     p_pic->p->p_pixels = p_sys->pp_buffer[p_sys->i_index];
514
515 #else
516     /* Update the texture */
517     glTexSubImage2D( GL_TEXTURE_2D, 0, 0, 0,
518                      p_vout->fmt_out.i_width,
519                      p_vout->fmt_out.i_height,
520                      VLCGL_FORMAT, VLCGL_TYPE, p_sys->pp_buffer[0] );
521 #endif
522
523     if( p_sys->p_vout->pf_unlock )
524     {
525         p_sys->p_vout->pf_unlock( p_sys->p_vout );
526     }
527 }
528
529 /*****************************************************************************
530  * DisplayVideo: displays previously rendered output
531  *****************************************************************************/
532 static void DisplayVideo( vout_thread_t *p_vout, picture_t *p_pic )
533 {
534     VLC_UNUSED(p_pic);
535     vout_sys_t *p_sys = p_vout->p_sys;
536     float f_width, f_height, f_x, f_y;
537
538     if( p_sys->p_vout->pf_lock &&
539         p_sys->p_vout->pf_lock( p_sys->p_vout ) )
540     {
541         msg_Warn( p_vout, "could not lock OpenGL provider" );
542         return;
543     }
544
545     /* glTexCoord works differently with GL_TEXTURE_2D and
546        GL_TEXTURE_RECTANGLE_EXT */
547 #ifdef __APPLE__
548     f_x = (float)p_vout->fmt_out.i_x_offset;
549     f_y = (float)p_vout->fmt_out.i_y_offset;
550     f_width = (float)p_vout->fmt_out.i_x_offset +
551               (float)p_vout->fmt_out.i_visible_width;
552     f_height = (float)p_vout->fmt_out.i_y_offset +
553                (float)p_vout->fmt_out.i_visible_height;
554 #else
555     f_x = (float)p_vout->fmt_out.i_x_offset / p_sys->i_tex_width;
556     f_y = (float)p_vout->fmt_out.i_y_offset / p_sys->i_tex_height;
557     f_width = ( (float)p_vout->fmt_out.i_x_offset +
558                 p_vout->fmt_out.i_visible_width ) / p_sys->i_tex_width;
559     f_height = ( (float)p_vout->fmt_out.i_y_offset +
560                  p_vout->fmt_out.i_visible_height ) / p_sys->i_tex_height;
561 #endif
562
563     /* Why drawing here and not in Render()? Because this way, the
564        OpenGL providers can call pf_display to force redraw. Currently,
565        the OS X provider uses it to get a smooth window resizing */
566
567     glClear( GL_COLOR_BUFFER_BIT );
568
569     glEnable( VLCGL_TARGET );
570     glBegin( GL_POLYGON );
571     glTexCoord2f( f_x, f_y ); glVertex2f( -1.0, 1.0 );
572     glTexCoord2f( f_width, f_y ); glVertex2f( 1.0, 1.0 );
573     glTexCoord2f( f_width, f_height ); glVertex2f( 1.0, -1.0 );
574     glTexCoord2f( f_x, f_height ); glVertex2f( -1.0, -1.0 );
575     glEnd();
576
577     glDisable( VLCGL_TARGET );
578
579     p_sys->p_vout->pf_swap( p_sys->p_vout );
580
581     if( p_sys->p_vout->pf_unlock )
582     {
583         p_sys->p_vout->pf_unlock( p_sys->p_vout );
584     }
585 }
586
587 int GetAlignedSize( int i_size )
588 {
589     /* Return the nearest power of 2 */
590     int i_result = 1;
591     while( i_result < i_size )
592     {
593         i_result *= 2;
594     }
595     return i_result;
596 }
597
598 /*****************************************************************************
599  * Control: control facility for the vout
600  *****************************************************************************/
601 static int Control( vout_thread_t *p_vout, int i_query, va_list args )
602 {
603     vout_sys_t *p_sys = p_vout->p_sys;
604
605     switch( i_query )
606     {
607     case VOUT_SNAPSHOT:
608         return vout_vaControlDefault( p_vout, i_query, args );
609
610     default:
611         if( p_sys->p_vout->pf_control )
612             return p_sys->p_vout->pf_control( p_sys->p_vout, i_query, args );
613         else
614             return vout_vaControlDefault( p_vout, i_query, args );
615     }
616 }
617
618 static int InitTextures( vout_thread_t *p_vout )
619 {
620     vout_sys_t *p_sys = p_vout->p_sys;
621     int i_index;
622
623     glDeleteTextures( 2, p_sys->p_textures );
624     glGenTextures( 2, p_sys->p_textures );
625
626     for( i_index = 0; i_index < 2; i_index++ )
627     {
628         glBindTexture( VLCGL_TARGET, p_sys->p_textures[i_index] );
629
630         /* Set the texture parameters */
631         glTexParameterf( VLCGL_TARGET, GL_TEXTURE_PRIORITY, 1.0 );
632
633         glTexParameteri( VLCGL_TARGET, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
634         glTexParameteri( VLCGL_TARGET, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
635
636         glTexParameteri( VLCGL_TARGET, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
637         glTexParameteri( VLCGL_TARGET, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
638
639         glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
640
641 #ifdef __APPLE__
642         /* Tell the driver not to make a copy of the texture but to use
643            our buffer */
644         glEnable( GL_UNPACK_CLIENT_STORAGE_APPLE );
645         glPixelStorei( GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE );
646
647 #if 0
648         /* Use VRAM texturing */
649         glTexParameteri( VLCGL_TARGET, GL_TEXTURE_STORAGE_HINT_APPLE,
650                          GL_STORAGE_CACHED_APPLE );
651 #else
652         /* Use AGP texturing */
653         glTexParameteri( VLCGL_TARGET, GL_TEXTURE_STORAGE_HINT_APPLE,
654                          GL_STORAGE_SHARED_APPLE );
655 #endif
656 #endif
657
658         /* Call glTexImage2D only once, and use glTexSubImage2D later */
659         glTexImage2D( VLCGL_TARGET, 0, 3, p_sys->i_tex_width,
660                       p_sys->i_tex_height, 0, VLCGL_FORMAT, VLCGL_TYPE,
661                       p_sys->pp_buffer[i_index] );
662     }
663
664     return 0;
665 }
666
667 /*****************************************************************************
668  * SendEvents: forward mouse and keyboard events to the parent p_vout
669  *****************************************************************************/
670 static int SendEvents( vlc_object_t *p_this, char const *psz_var,
671                        vlc_value_t oldval, vlc_value_t newval, void *_p_vout )
672 {
673     VLC_UNUSED(p_this); VLC_UNUSED(oldval);
674     return var_Set( (vlc_object_t *)_p_vout, psz_var, newval );
675 }