git.sesse.net Git - vlc/blob - modules/video_output/opengl.c

   1 /*****************************************************************************
   2  * opengl.c: OpenGL and OpenGL ES output common code
   3  *****************************************************************************
   4  * Copyright (C) 2004-2011 VLC authors and VideoLAN
   5  * Copyright (C) 2009, 2011 Laurent Aimar
   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  *          Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_picture_pool.h>
  33 #include <vlc_subpicture.h>
  34 #include <vlc_opengl.h>
  35
  36 #include "opengl.h"
  37 // Define USE_OPENGL_ES to the GL ES Version you want to select
  38
  39 #ifdef __APPLE__
  40 # define PFNGLGENPROGRAMSARBPROC              typeof(glGenProgramsARB)*
  41 # define PFNGLBINDPROGRAMARBPROC              typeof(glBindProgramARB)*
  42 # define PFNGLPROGRAMSTRINGARBPROC            typeof(glProgramStringARB)*
  43 # define PFNGLDELETEPROGRAMSARBPROC           typeof(glDeleteProgramsARB)*
  44 # define PFNGLPROGRAMLOCALPARAMETER4FVARBPROC typeof(glProgramLocalParameter4fvARB)*
  45 # define PFNGLACTIVETEXTUREPROC               typeof(glActiveTexture)*
  46 # define PFNGLCLIENTACTIVETEXTUREPROC         typeof(glClientActiveTexture)*
  47 #endif
  48
  49 /* RV16 */
  50 #ifndef GL_UNSIGNED_SHORT_5_6_5
  51 # define GL_UNSIGNED_SHORT_5_6_5 0x8363
  52 #endif
  53 #ifndef GL_CLAMP_TO_EDGE
  54 # define GL_CLAMP_TO_EDGE 0x812F
  55 #endif
  56
  57 #if USE_OPENGL_ES
  58 #   define VLCGL_TEXTURE_COUNT 1
  59 #   define VLCGL_PICTURE_MAX 1
  60 #else
  61 #   define VLCGL_TEXTURE_COUNT 1
  62 #   define VLCGL_PICTURE_MAX 128
  63 #endif
  64
  65 static const vlc_fourcc_t gl_subpicture_chromas[] = {
  66     VLC_CODEC_RGBA,
  67     0
  68 };
  69
  70 typedef struct {
  71     GLuint   texture;
  72     unsigned format;
  73     unsigned type;
  74     unsigned width;
  75     unsigned height;
  76
  77     float    alpha;
  78
  79     float    top;
  80     float    left;
  81     float    bottom;
  82     float    right;
  83 } gl_region_t;
  84
  85 struct vout_display_opengl_t {
  86     vlc_gl_t   *gl;
  87
  88     video_format_t fmt;
  89     const vlc_chroma_description_t *chroma;
  90
  91     int        tex_target;
  92     int        tex_format;
  93     int        tex_internal;
  94     int        tex_type;
  95
  96     int        tex_width[PICTURE_PLANE_MAX];
  97     int        tex_height[PICTURE_PLANE_MAX];
  98
  99     GLuint     texture[VLCGL_TEXTURE_COUNT][PICTURE_PLANE_MAX];
 100
 101     int         region_count;
 102     gl_region_t *region;
 103
 104
 105     picture_pool_t *pool;
 106
 107     GLuint     program;
 108     int        local_count;
 109     GLfloat    local_value[16][4];
 110
 111     /* fragment_program */
 112     PFNGLGENPROGRAMSARBPROC              GenProgramsARB;
 113     PFNGLBINDPROGRAMARBPROC              BindProgramARB;
 114     PFNGLPROGRAMSTRINGARBPROC            ProgramStringARB;
 115     PFNGLDELETEPROGRAMSARBPROC           DeleteProgramsARB;
 116     PFNGLPROGRAMLOCALPARAMETER4FVARBPROC ProgramLocalParameter4fvARB;
 117
 118     /* multitexture */
 119     bool use_multitexture;
 120     PFNGLACTIVETEXTUREPROC   ActiveTexture;
 121     PFNGLCLIENTACTIVETEXTUREPROC ClientActiveTexture;
 122 };
 123
 124 static inline int GetAlignedSize(unsigned size)
 125 {
 126     /* Return the smallest larger or equal power of 2 */
 127     unsigned align = 1 << (8 * sizeof (unsigned) - clz(size));
 128     return ((align >> 1) == size) ? size : align;
 129 }
 130
 131 static bool IsLuminance16Supported(int target)
 132 {
 133 #if defined(MACOS_OPENGL)
 134     /* OpenGL 1.x on OS X does _not_ support 16bit shaders, but pretends to.
 135      * That's why we enforce return false here, even though the actual code below
 136      * would return true.
 137      * This fixes playback of 10bit content on the Intel GMA 950 chipset, which is
 138      * the only "GPU" supported by 10.6 and 10.7 with just an OpenGL 1.4 driver.
 139      *
 140      * Presumely, this also improves playback on the GMA 3100, GeForce FX 5200,
 141      * GeForce4 Ti, GeForce3, GeForce2 MX/4 MX and the Radeon 8500 when
 142      * running OS X 10.5. */
 143     const GLubyte * p_glversion;
 144     float f_glversion;
 145     p_glversion = glGetString (GL_VERSION);
 146     sscanf((char *)p_glversion, "%f", &f_glversion);
 147     if (f_glversion < 2)
 148         return false;
 149 #endif
 150
 151     GLuint texture;
 152
 153     glGenTextures(1, &texture);
 154     glBindTexture(target, texture);
 155     glTexImage2D(target, 0, GL_LUMINANCE16,
 156                  64, 64, 0, GL_LUMINANCE, GL_UNSIGNED_SHORT, NULL);
 157     GLint size = 0;
 158     glGetTexLevelParameteriv(target, 0, GL_TEXTURE_LUMINANCE_SIZE, &size);
 159
 160     glDeleteTextures(1, &texture);
 161
 162     return size == 16;
 163 }
 164
 165 vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
 166                                                const vlc_fourcc_t **subpicture_chromas,
 167                                                vlc_gl_t *gl)
 168 {
 169     vout_display_opengl_t *vgl = calloc(1, sizeof(*vgl));
 170     if (!vgl)
 171         return NULL;
 172
 173     vgl->gl = gl;
 174     if (vlc_gl_Lock(vgl->gl)) {
 175         free(vgl);
 176         return NULL;
 177     }
 178
 179     const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
 180
 181     /* Load extensions */
 182     bool supports_fp = false;
 183     if (HasExtension(extensions, "GL_ARB_fragment_program")) {
 184 #if !defined(MACOS_OPENGL)
 185         vgl->GenProgramsARB    = (PFNGLGENPROGRAMSARBPROC)vlc_gl_GetProcAddress(vgl->gl, "glGenProgramsARB");
 186         vgl->BindProgramARB    = (PFNGLBINDPROGRAMARBPROC)vlc_gl_GetProcAddress(vgl->gl, "glBindProgramARB");
 187         vgl->ProgramStringARB  = (PFNGLPROGRAMSTRINGARBPROC)vlc_gl_GetProcAddress(vgl->gl, "glProgramStringARB");
 188         vgl->DeleteProgramsARB = (PFNGLDELETEPROGRAMSARBPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteProgramsARB");
 189         vgl->ProgramLocalParameter4fvARB = (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC)vlc_gl_GetProcAddress(vgl->gl, "glProgramLocalParameter4fvARB");
 190 #else
 191         vgl->GenProgramsARB = glGenProgramsARB;
 192         vgl->BindProgramARB = glBindProgramARB;
 193         vgl->ProgramStringARB = glProgramStringARB;
 194         vgl->DeleteProgramsARB = glDeleteProgramsARB;
 195         vgl->ProgramLocalParameter4fvARB = glProgramLocalParameter4fvARB;
 196 #endif
 197         supports_fp = vgl->GenProgramsARB &&
 198                       vgl->BindProgramARB &&
 199                       vgl->ProgramStringARB &&
 200                       vgl->DeleteProgramsARB &&
 201                       vgl->ProgramLocalParameter4fvARB;
 202     }
 203
 204     bool supports_multitexture = false;
 205     GLint max_texture_units = 0;
 206     if (HasExtension(extensions, "GL_ARB_multitexture")) {
 207 #if !defined(MACOS_OPENGL)
 208         vgl->ActiveTexture   = (PFNGLACTIVETEXTUREPROC)vlc_gl_GetProcAddress(vgl->gl, "glActiveTexture");
 209         vgl->ClientActiveTexture = (PFNGLCLIENTACTIVETEXTUREPROC)vlc_gl_GetProcAddress(vgl->gl, "glClientActiveTexture");
 210 #else
 211         vgl->ActiveTexture = glActiveTexture;
 212         vgl->ClientActiveTexture = glClientActiveTexture;
 213 #endif
 214         supports_multitexture = vgl->ActiveTexture &&
 215                                 vgl->ClientActiveTexture;
 216         if (supports_multitexture)
 217             glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &max_texture_units);
 218     }
 219
 220     /* Initialize with default chroma */
 221     vgl->fmt = *fmt;
 222 #if USE_OPENGL_ES
 223     vgl->fmt.i_chroma = VLC_CODEC_RGB16;
 224 #   if defined(WORDS_BIGENDIAN)
 225     vgl->fmt.i_rmask  = 0x001f;
 226     vgl->fmt.i_gmask  = 0x07e0;
 227     vgl->fmt.i_bmask  = 0xf800;
 228 #   else
 229     vgl->fmt.i_rmask  = 0xf800;
 230     vgl->fmt.i_gmask  = 0x07e0;
 231     vgl->fmt.i_bmask  = 0x001f;
 232 #   endif
 233     vgl->tex_target   = GL_TEXTURE_2D;
 234     vgl->tex_format   = GL_RGB;
 235     vgl->tex_internal = GL_RGB;
 236     vgl->tex_type     = GL_UNSIGNED_SHORT_5_6_5;
 237 #else
 238     vgl->fmt.i_chroma = VLC_CODEC_RGB32;
 239 #   if defined(WORDS_BIGENDIAN)
 240     vgl->fmt.i_rmask  = 0xff000000;
 241     vgl->fmt.i_gmask  = 0x00ff0000;
 242     vgl->fmt.i_bmask  = 0x0000ff00;
 243 #   else
 244     vgl->fmt.i_rmask  = 0x000000ff;
 245     vgl->fmt.i_gmask  = 0x0000ff00;
 246     vgl->fmt.i_bmask  = 0x00ff0000;
 247 #   endif
 248     vgl->tex_target   = GL_TEXTURE_2D;
 249     vgl->tex_format   = GL_RGBA;
 250     vgl->tex_internal = GL_RGBA;
 251     vgl->tex_type     = GL_UNSIGNED_BYTE;
 252 #endif
 253     /* Use YUV if possible and needed */
 254     bool need_fs_yuv = false;
 255     float yuv_range_correction = 1.0;
 256     if (supports_fp && supports_multitexture && max_texture_units >= 3 &&
 257         vlc_fourcc_IsYUV(fmt->i_chroma) && !vlc_fourcc_IsYUV(vgl->fmt.i_chroma)) {
 258         const vlc_fourcc_t *list = vlc_fourcc_GetYUVFallback(fmt->i_chroma);
 259         while (*list) {
 260             const vlc_chroma_description_t *dsc = vlc_fourcc_GetChromaDescription(*list);
 261             if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 1) {
 262                 need_fs_yuv       = true;
 263                 vgl->fmt          = *fmt;
 264                 vgl->fmt.i_chroma = *list;
 265                 vgl->tex_format   = GL_LUMINANCE;
 266                 vgl->tex_internal = GL_LUMINANCE;
 267                 vgl->tex_type     = GL_UNSIGNED_BYTE;
 268                 yuv_range_correction = 1.0;
 269                 break;
 270             } else if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 2 &&
 271                        IsLuminance16Supported(vgl->tex_target)) {
 272                 need_fs_yuv       = true;
 273                 vgl->fmt          = *fmt;
 274                 vgl->fmt.i_chroma = *list;
 275                 vgl->tex_format   = GL_LUMINANCE;
 276                 vgl->tex_internal = GL_LUMINANCE16;
 277                 vgl->tex_type     = GL_UNSIGNED_SHORT;
 278                 yuv_range_correction = (float)((1 << 16) - 1) / ((1 << dsc->pixel_bits) - 1);
 279                 break;
 280             }
 281             list++;
 282         }
 283     }
 284 #if (defined (__ppc__) || defined (__ppc64__) || defined (__powerpc__)) && defined (__APPLE__)
 285     /* This is a work-around for dated PowerPC-based Macs, which run OpenGL 1.3 only and don't
 286      * support the GL_ARB_fragment_program extension.
 287      * Affected devices are all Macs built between 2002 and 2005 with an ATI Radeon 7500,
 288      * an ATI Radeon 9200 or a NVIDIA GeForceFX 5200 Ultra. */
 289     else
 290     {
 291         vgl->tex_format   = GL_YCBCR_422_APPLE;
 292         vgl->tex_type     = GL_UNSIGNED_SHORT_8_8_APPLE;
 293         vgl->fmt.i_chroma = VLC_CODEC_YUYV;
 294     }
 295 #endif
 296
 297     vgl->chroma = vlc_fourcc_GetChromaDescription(vgl->fmt.i_chroma);
 298     vgl->use_multitexture = vgl->chroma->plane_count > 1;
 299
 300     bool supports_npot = false;
 301 #if USE_OPENGL_ES == 2
 302     supports_npot = true;
 303 #else
 304     supports_npot |= HasExtension(extensions, "GL_APPLE_texture_2D_limited_npot") ||
 305                      HasExtension(extensions, "GL_ARB_texture_non_power_of_two");
 306 #endif
 307
 308     /* Texture size */
 309     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 310         int w = vgl->fmt.i_width  * vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den;
 311         int h = vgl->fmt.i_height * vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den;
 312         if (supports_npot) {
 313             vgl->tex_width[j]  = w;
 314             vgl->tex_height[j] = h;
 315         }
 316         else {
 317             /* A texture must have a size aligned on a power of 2 */
 318             vgl->tex_width[j]  = GetAlignedSize(w);
 319             vgl->tex_height[j] = GetAlignedSize(h);
 320         }
 321     }
 322
 323     /* Build fragment program if needed */
 324     vgl->program = 0;
 325     vgl->local_count = 0;
 326     if (supports_fp) {
 327         char *code = NULL;
 328
 329         if (need_fs_yuv) {
 330             /* [R/G/B][Y U V O] from TV range to full range
 331              * XXX we could also do hue/brightness/constrast/gamma
 332              * by simply changing the coefficients
 333              */
 334             const float matrix_bt601_tv2full[3][4] = {
 335                 { 1.164383561643836,  0.0000,             1.596026785714286, -0.874202217873451 },
 336                 { 1.164383561643836, -0.391762290094914, -0.812967647237771,  0.531667823499146 },
 337                 { 1.164383561643836,  2.017232142857142,  0.0000,            -1.085630789302022 },
 338             };
 339             const float matrix_bt709_tv2full[3][4] = {
 340                 { 1.164383561643836,  0.0000,             1.792741071428571, -0.972945075016308 },
 341                 { 1.164383561643836, -0.21324861427373,  -0.532909328559444,  0.301482665475862 },
 342                 { 1.164383561643836,  2.112401785714286,  0.0000,            -1.133402217873451 },
 343             };
 344             const float (*matrix)[4] = fmt->i_height > 576 ? matrix_bt709_tv2full
 345                                                            : matrix_bt601_tv2full;
 346
 347             /* Basic linear YUV -> RGB conversion using bilinear interpolation */
 348             const char *template_yuv =
 349                 "!!ARBfp1.0"
 350                 "OPTION ARB_precision_hint_fastest;"
 351
 352                 "TEMP src;"
 353                 "TEX src.x,  fragment.texcoord[0], texture[0], 2D;"
 354                 "TEX src.%c, fragment.texcoord[1], texture[1], 2D;"
 355                 "TEX src.%c, fragment.texcoord[2], texture[2], 2D;"
 356
 357                 "PARAM coefficient[4] = { program.local[0..3] };"
 358
 359                 "TEMP tmp;"
 360                 "MAD  tmp.rgb,          src.xxxx, coefficient[0], coefficient[3];"
 361                 "MAD  tmp.rgb,          src.yyyy, coefficient[1], tmp;"
 362                 "MAD  result.color.rgb, src.zzzz, coefficient[2], tmp;"
 363                 "END";
 364             bool swap_uv = vgl->fmt.i_chroma == VLC_CODEC_YV12 ||
 365                            vgl->fmt.i_chroma == VLC_CODEC_YV9;
 366             if (asprintf(&code, template_yuv,
 367                          swap_uv ? 'z' : 'y',
 368                          swap_uv ? 'y' : 'z') < 0)
 369                 code = NULL;
 370
 371             for (int i = 0; i < 4; i++) {
 372                 float correction = i < 3 ? yuv_range_correction : 1.0;
 373                 for (int j = 0; j < 4; j++) {
 374                     vgl->local_value[vgl->local_count + i][j] = j < 3 ? correction * matrix[j][i] : 0.0;
 375                 }
 376             }
 377             vgl->local_count += 4;
 378         }
 379         if (code) {
 380         // Here you have shaders
 381             vgl->GenProgramsARB(1, &vgl->program);
 382             vgl->BindProgramARB(GL_FRAGMENT_PROGRAM_ARB, vgl->program);
 383             vgl->ProgramStringARB(GL_FRAGMENT_PROGRAM_ARB,
 384                                   GL_PROGRAM_FORMAT_ASCII_ARB,
 385                                   strlen(code), (const GLbyte*)code);
 386             if (glGetError() == GL_INVALID_OPERATION) {
 387                 /* FIXME if the program was needed for YUV, the video will be broken */
 388 #if 0
 389                 GLint position;
 390                 glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &position);
 391
 392                 const char *msg = (const char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB);
 393                 fprintf(stderr, "GL_INVALID_OPERATION: error at %d: %s\n", position, msg);
 394 #endif
 395                 vgl->DeleteProgramsARB(1, &vgl->program);
 396                 vgl->program = 0;
 397             }
 398             free(code);
 399         }
 400     }
 401
 402     /* */
 403     glDisable(GL_BLEND);
 404     glDisable(GL_DEPTH_TEST);
 405     glDepthMask(GL_FALSE);
 406     glDisable(GL_CULL_FACE);
 407     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 408     glClear(GL_COLOR_BUFFER_BIT);
 409
 410     vlc_gl_Unlock(vgl->gl);
 411
 412     /* */
 413     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 414         for (int j = 0; j < PICTURE_PLANE_MAX; j++)
 415             vgl->texture[i][j] = 0;
 416     }
 417     vgl->region_count = 0;
 418     vgl->region = NULL;
 419     vgl->pool = NULL;
 420
 421     *fmt = vgl->fmt;
 422     if (subpicture_chromas) {
 423         *subpicture_chromas = NULL;
 424 #if !USE_OPENGL_ES
 425         if (supports_npot)
 426             *subpicture_chromas = gl_subpicture_chromas;
 427 #endif
 428     }
 429     return vgl;
 430 }
 431
 432 void vout_display_opengl_Delete(vout_display_opengl_t *vgl)
 433 {
 434     /* */
 435     if (!vlc_gl_Lock(vgl->gl)) {
 436
 437         glFinish();
 438         glFlush();
 439         for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++)
 440             glDeleteTextures(vgl->chroma->plane_count, vgl->texture[i]);
 441         for (int i = 0; i < vgl->region_count; i++) {
 442             if (vgl->region[i].texture)
 443                 glDeleteTextures(1, &vgl->region[i].texture);
 444         }
 445         free(vgl->region);
 446
 447         if (vgl->program)
 448             vgl->DeleteProgramsARB(1, &vgl->program);
 449
 450         vlc_gl_Unlock(vgl->gl);
 451     }
 452     if (vgl->pool)
 453         picture_pool_Delete(vgl->pool);
 454     free(vgl);
 455 }
 456
 457 picture_pool_t *vout_display_opengl_GetPool(vout_display_opengl_t *vgl, unsigned requested_count)
 458 {
 459     if (vgl->pool)
 460         return vgl->pool;
 461
 462     /* Allocate our pictures */
 463     picture_t *picture[VLCGL_PICTURE_MAX] = {NULL, };
 464     unsigned count = 0;
 465
 466     for (count = 0; count < __MIN(VLCGL_PICTURE_MAX, requested_count); count++) {
 467         picture[count] = picture_NewFromFormat(&vgl->fmt);
 468         if (!picture[count])
 469             break;
 470     }
 471     if (count <= 0)
 472         return NULL;
 473
 474     /* Wrap the pictures into a pool */
 475     picture_pool_configuration_t cfg;
 476     memset(&cfg, 0, sizeof(cfg));
 477     cfg.picture_count = count;
 478     cfg.picture       = picture;
 479     vgl->pool = picture_pool_NewExtended(&cfg);
 480     if (!vgl->pool)
 481         goto error;
 482
 483     /* Allocates our textures */
 484     if (vlc_gl_Lock(vgl->gl))
 485         return vgl->pool;
 486
 487     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 488         glGenTextures(vgl->chroma->plane_count, vgl->texture[i]);
 489         for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 490             if (vgl->use_multitexture)
 491                 vgl->ActiveTexture(GL_TEXTURE0 + j);
 492             glBindTexture(vgl->tex_target, vgl->texture[i][j]);
 493
 494 #if !USE_OPENGL_ES
 495             /* Set the texture parameters */
 496             glTexParameterf(vgl->tex_target, GL_TEXTURE_PRIORITY, 1.0);
 497             glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 498 #endif
 499
 500             glTexParameteri(vgl->tex_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 501             glTexParameteri(vgl->tex_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 502             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 503             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 504
 505             /* Call glTexImage2D only once, and use glTexSubImage2D later */
 506             glTexImage2D(vgl->tex_target, 0,
 507                          vgl->tex_internal, vgl->tex_width[j], vgl->tex_height[j],
 508                          0, vgl->tex_format, vgl->tex_type, NULL);
 509         }
 510     }
 511
 512     vlc_gl_Unlock(vgl->gl);
 513
 514     return vgl->pool;
 515
 516 error:
 517     for (unsigned i = 0; i < count; i++)
 518         picture_Release(picture[i]);
 519     return NULL;
 520 }
 521
 522 int vout_display_opengl_Prepare(vout_display_opengl_t *vgl,
 523                                 picture_t *picture, subpicture_t *subpicture)
 524 {
 525     /* On Win32/GLX, we do this the usual way:
 526        + Fill the buffer with new content,
 527        + Reload the texture,
 528        + Use the texture.
 529
 530        On OS X with VRAM or AGP texturing, the order has to be:
 531        + Reload the texture,
 532        + Fill the buffer with new content,
 533        + Use the texture.
 534
 535        (Thanks to gcc from the Arstechnica forums for the tip)
 536
 537        Therefore on OSX, we have to use two buffers and textures and use a
 538        lock(/unlock) managed picture pool.
 539      */
 540
 541     if (vlc_gl_Lock(vgl->gl))
 542         return VLC_EGENERIC;
 543
 544     /* Update the texture */
 545     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 546         if (vgl->use_multitexture)
 547             vgl->ActiveTexture(GL_TEXTURE0 + j);
 548         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 549         glPixelStorei(GL_UNPACK_ROW_LENGTH, picture->p[j].i_pitch / picture->p[j].i_pixel_pitch);
 550         glTexSubImage2D(vgl->tex_target, 0,
 551                         0, 0,
 552                         vgl->fmt.i_width  * vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den,
 553                         vgl->fmt.i_height * vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den,
 554                         vgl->tex_format, vgl->tex_type, picture->p[j].p_pixels);
 555     }
 556
 557     int         last_count = vgl->region_count;
 558     gl_region_t *last = vgl->region;
 559
 560     vgl->region_count = 0;
 561     vgl->region       = NULL;
 562
 563     if (subpicture) {
 564
 565         int count = 0;
 566         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next)
 567             count++;
 568
 569         vgl->region_count = count;
 570         vgl->region       = calloc(count, sizeof(*vgl->region));
 571
 572         if (vgl->use_multitexture)
 573             vgl->ActiveTexture(GL_TEXTURE0 + 0);
 574         int i = 0;
 575         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next, i++) {
 576             gl_region_t *glr = &vgl->region[i];
 577
 578             glr->format = GL_RGBA;
 579             glr->type   = GL_UNSIGNED_BYTE;
 580             glr->width  = r->fmt.i_visible_width;
 581             glr->height = r->fmt.i_visible_height;
 582             glr->alpha  = (float)subpicture->i_alpha * r->i_alpha / 255 / 255;
 583             glr->left   =  2.0 * (r->i_x                          ) / subpicture->i_original_picture_width  - 1.0;
 584             glr->top    = -2.0 * (r->i_y                          ) / subpicture->i_original_picture_height + 1.0;
 585             glr->right  =  2.0 * (r->i_x + r->fmt.i_visible_width ) / subpicture->i_original_picture_width  - 1.0;
 586             glr->bottom = -2.0 * (r->i_y + r->fmt.i_visible_height) / subpicture->i_original_picture_height + 1.0;
 587
 588             glr->texture = 0;
 589             for (int j = 0; j < last_count; j++) {
 590                 if (last[j].texture &&
 591                     last[j].width  == glr->width &&
 592                     last[j].height == glr->height &&
 593                     last[j].format == glr->format &&
 594                     last[j].type   == glr->type) {
 595                     glr->texture = last[j].texture;
 596                     memset(&last[j], 0, sizeof(last[j]));
 597                     break;
 598                 }
 599             }
 600
 601             const int pixels_offset = r->fmt.i_y_offset * r->p_picture->p->i_pitch +
 602                                       r->fmt.i_x_offset * r->p_picture->p->i_pixel_pitch;
 603             if (glr->texture) {
 604                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 605                 /* TODO set GL_UNPACK_ALIGNMENT */
 606                 glPixelStorei(GL_UNPACK_ROW_LENGTH, r->p_picture->p->i_pitch / r->p_picture->p->i_pixel_pitch);
 607                 glTexSubImage2D(GL_TEXTURE_2D, 0,
 608                                 0, 0, glr->width, glr->height,
 609                                 glr->format, glr->type, &r->p_picture->p->p_pixels[pixels_offset]);
 610             } else {
 611                 glGenTextures(1, &glr->texture);
 612                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 613                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 1.0);
 614                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 615                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 616                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 617                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 618                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 619                 /* TODO set GL_UNPACK_ALIGNMENT */
 620                 glPixelStorei(GL_UNPACK_ROW_LENGTH, r->p_picture->p->i_pitch / r->p_picture->p->i_pixel_pitch);
 621                 glTexImage2D(GL_TEXTURE_2D, 0, glr->format,
 622                              glr->width, glr->height, 0, glr->format, glr->type,
 623                              &r->p_picture->p->p_pixels[pixels_offset]);
 624             }
 625         }
 626     }
 627     for (int i = 0; i < last_count; i++) {
 628         if (last[i].texture)
 629             glDeleteTextures(1, &last[i].texture);
 630     }
 631     free(last);
 632
 633     vlc_gl_Unlock(vgl->gl);
 634     VLC_UNUSED(subpicture);
 635     return VLC_SUCCESS;
 636 }
 637
 638 int vout_display_opengl_Display(vout_display_opengl_t *vgl,
 639                                 const video_format_t *source)
 640 {
 641     if (vlc_gl_Lock(vgl->gl))
 642         return VLC_EGENERIC;
 643
 644     /* glTexCoord works differently with GL_TEXTURE_2D and
 645        GL_TEXTURE_RECTANGLE_EXT */
 646     float left[PICTURE_PLANE_MAX];
 647     float top[PICTURE_PLANE_MAX];
 648     float right[PICTURE_PLANE_MAX];
 649     float bottom[PICTURE_PLANE_MAX];
 650     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 651         float scale_w, scale_h;
 652         if (vgl->tex_target == GL_TEXTURE_2D) {
 653             scale_w = (float)vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den / vgl->tex_width[j];
 654             scale_h = (float)vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den / vgl->tex_height[j];
 655
 656         } else {
 657             scale_w = 1.0;
 658             scale_h = 1.0;
 659         }
 660         left[j]   = (source->i_x_offset +                       0 ) * scale_w;
 661         top[j]    = (source->i_y_offset +                       0 ) * scale_h;
 662         right[j]  = (source->i_x_offset + source->i_visible_width ) * scale_w;
 663         bottom[j] = (source->i_y_offset + source->i_visible_height) * scale_h;
 664     }
 665
 666
 667     /* Why drawing here and not in Render()? Because this way, the
 668        OpenGL providers can call vout_display_opengl_Display to force redraw.i
 669        Currently, the OS X provider uses it to get a smooth window resizing */
 670
 671     glClear(GL_COLOR_BUFFER_BIT);
 672
 673     if (vgl->program) {
 674         glEnable(GL_FRAGMENT_PROGRAM_ARB);
 675         for (int i = 0; i < vgl->local_count; i++)
 676             vgl->ProgramLocalParameter4fvARB(GL_FRAGMENT_PROGRAM_ARB, i, vgl->local_value[i]);
 677     } else {
 678         glEnable(vgl->tex_target);
 679     }
 680
 681 #if USE_OPENGL_ES
 682     static const GLfloat vertexCoord[] = {
 683         -1.0f, -1.0f,
 684          1.0f, -1.0f,
 685         -1.0f,  1.0f,
 686          1.0f,  1.0f,
 687     };
 688
 689     const GLfloat textureCoord[8] = {
 690         left[0],  bottom[0],
 691         right[0], bottom[0],
 692         left[0],  top[0],
 693         right[0], top[0]
 694     };
 695
 696     glEnableClientState(GL_VERTEX_ARRAY);
 697     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 698     glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
 699     glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
 700
 701     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 702
 703     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 704     glDisableClientState(GL_VERTEX_ARRAY);
 705     glDisable(vgl->tex_target);
 706 #else
 707
 708     const GLfloat vertexCoord[] = {
 709         -1.0, 1.0,
 710         -1.0, -1.0,
 711         1.0, 1.0,
 712         1.0, -1.0,
 713     };
 714
 715     for( unsigned j = 0; j < vgl->chroma->plane_count; j++)
 716     {
 717         const GLfloat texCoord[] = {
 718             left[j], top[j],
 719             left[j], bottom[j],
 720             right[j], top[j],
 721             right[j], bottom[j],
 722         };
 723         vgl->ActiveTexture( GL_TEXTURE0+j);
 724         vgl->ClientActiveTexture( GL_TEXTURE0+j);
 725         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 726         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 727         glTexCoordPointer(2, GL_FLOAT, 0, texCoord);
 728     }
 729     glEnableClientState(GL_VERTEX_ARRAY);
 730     glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
 731     glDrawArrays( GL_TRIANGLE_STRIP, 0, 4);
 732     glDisableClientState(GL_VERTEX_ARRAY);
 733
 734     for( int j = vgl->chroma->plane_count; j >= 0;j--)
 735     {
 736         vgl->ActiveTexture( GL_TEXTURE0+j);
 737         vgl->ClientActiveTexture( GL_TEXTURE0+j);
 738         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 739     }
 740
 741
 742
 743     if (vgl->program)
 744         glDisable(GL_FRAGMENT_PROGRAM_ARB);
 745     else
 746         glDisable(vgl->tex_target);
 747
 748     if (vgl->use_multitexture)
 749         vgl->ActiveTexture(GL_TEXTURE0 + 0);
 750     glEnable(GL_TEXTURE_2D);
 751     glEnable(GL_BLEND);
 752     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 753     glEnableClientState(GL_VERTEX_ARRAY);
 754     const GLfloat textureCoord[] = {
 755         0.0, 0.0,
 756         0.0, 1.0,
 757         1.0, 0.0,
 758         1.0, 1.0,
 759     };
 760     for (int i = 0; i < vgl->region_count; i++) {
 761         gl_region_t *glr = &vgl->region[i];
 762         const GLfloat vertexCoord[] = {
 763             glr->left, glr->top,
 764             glr->left, glr->bottom,
 765             glr->right, glr->top,
 766             glr->right,glr->bottom,
 767         };
 768         glColor4f(1.0f, 1.0f, 1.0f, glr->alpha);
 769         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 770
 771         glBindTexture(GL_TEXTURE_2D, glr->texture);
 772         glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
 773         glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
 774         glDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );
 775         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 776     }
 777     glDisableClientState(GL_VERTEX_ARRAY);
 778     glDisable(GL_BLEND);
 779     glDisable(GL_TEXTURE_2D);
 780 #endif
 781
 782     vlc_gl_Swap(vgl->gl);
 783
 784     vlc_gl_Unlock(vgl->gl);
 785     return VLC_SUCCESS;
 786 }
 787