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) 2004-2013 VLC authors and VideoLAN
   5  * Copyright (C) 2009, 2011 Laurent Aimar
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *          Ilkka Ollakka <ileoo@videolan.org>
   9  *          Rémi Denis-Courmont
  10  *          Adrien Maglo <magsoft at videolan dot org>
  11  *          Felix Paul Kühne <fkuehne at videolan dot org>
  12  *          Pierre d'Herbemont <pdherbemont at videolan dot org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU Lesser General Public License as published by
  16  * the Free Software Foundation; either version 2.1 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  * GNU Lesser General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Lesser General Public License
  25  * along with this program; if not, write to the Free Software Foundation,
  26  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_picture_pool.h>
  34 #include <vlc_subpicture.h>
  35 #include <vlc_opengl.h>
  36
  37 #include "opengl.h"
  38
  39 #ifndef GL_CLAMP_TO_EDGE
  40 # define GL_CLAMP_TO_EDGE 0x812F
  41 #endif
  42
  43 #if USE_OPENGL_ES == 2 || defined(__APPLE__)
  44 #   define PFNGLGETPROGRAMIVPROC             typeof(glGetProgramiv)*
  45 #   define PFNGLGETPROGRAMINFOLOGPROC        typeof(glGetProgramInfoLog)*
  46 #   define PFNGLGETSHADERIVPROC              typeof(glGetShaderiv)*
  47 #   define PFNGLGETSHADERINFOLOGPROC         typeof(glGetShaderInfoLog)*
  48 #   define PFNGLGETUNIFORMLOCATIONPROC       typeof(glGetUniformLocation)*
  49 #   define PFNGLGETATTRIBLOCATIONPROC        typeof(glGetAttribLocation)*
  50 #   define PFNGLVERTEXATTRIBPOINTERPROC      typeof(glVertexAttribPointer)*
  51 #   define PFNGLENABLEVERTEXATTRIBARRAYPROC  typeof(glEnableVertexAttribArray)*
  52 #   define PFNGLUNIFORM4FVPROC               typeof(glUniform4fv)*
  53 #   define PFNGLUNIFORM4FPROC                typeof(glUniform4f)*
  54 #   define PFNGLUNIFORM1IPROC                typeof(glUniform1i)*
  55 #   define PFNGLCREATESHADERPROC             typeof(glCreateShader)*
  56 #   define PFNGLSHADERSOURCEPROC             typeof(glShaderSource)*
  57 #   define PFNGLCOMPILESHADERPROC            typeof(glCompileShader)*
  58 #   define PFNGLDELETESHADERPROC             typeof(glDeleteShader)*
  59 #   define PFNGLCREATEPROGRAMPROC            typeof(glCreateProgram)*
  60 #   define PFNGLLINKPROGRAMPROC              typeof(glLinkProgram)*
  61 #   define PFNGLUSEPROGRAMPROC               typeof(glUseProgram)*
  62 #   define PFNGLDELETEPROGRAMPROC            typeof(glDeleteProgram)*
  63 #   define PFNGLATTACHSHADERPROC             typeof(glAttachShader)*
  64 #if defined(__APPLE__) && USE_OPENGL_ES
  65 #   import <CoreFoundation/CoreFoundation.h>
  66 #endif
  67 #endif
  68
  69 #if USE_OPENGL_ES
  70 #   define GLSL_VERSION "100"
  71 #   define VLCGL_TEXTURE_COUNT 1
  72 #   define VLCGL_PICTURE_MAX 1
  73 #   define PRECISION "precision highp float;"
  74 #if USE_OPENGL_ES == 2
  75 #   define SUPPORTS_SHADERS
  76 #   define glClientActiveTexture(x)
  77 #else
  78 #   define SUPPORTS_FIXED_PIPELINE
  79 #   define GL_MAX_TEXTURE_IMAGE_UNITS GL_MAX_TEXTURE_UNITS
  80 #endif
  81 #else
  82 #   define GLSL_VERSION "120"
  83 #   define VLCGL_TEXTURE_COUNT 1
  84 #   define VLCGL_PICTURE_MAX 128
  85 #   define PRECISION ""
  86 #   define SUPPORTS_SHADERS
  87 #   define SUPPORTS_FIXED_PIPELINE
  88 #endif
  89
  90 static const vlc_fourcc_t gl_subpicture_chromas[] = {
  91     VLC_CODEC_RGBA,
  92     0
  93 };
  94
  95 typedef struct {
  96     GLuint   texture;
  97     unsigned format;
  98     unsigned type;
  99     unsigned width;
 100     unsigned height;
 101
 102     float    alpha;
 103
 104     float    top;
 105     float    left;
 106     float    bottom;
 107     float    right;
 108
 109     float    tex_width;
 110     float    tex_height;
 111 } gl_region_t;
 112
 113 struct vout_display_opengl_t {
 114
 115     vlc_gl_t   *gl;
 116
 117     video_format_t fmt;
 118     const vlc_chroma_description_t *chroma;
 119
 120     int        tex_target;
 121     int        tex_format;
 122     int        tex_internal;
 123     int        tex_type;
 124
 125     int        tex_width[PICTURE_PLANE_MAX];
 126     int        tex_height[PICTURE_PLANE_MAX];
 127
 128     GLuint     texture[VLCGL_TEXTURE_COUNT][PICTURE_PLANE_MAX];
 129
 130     int         region_count;
 131     gl_region_t *region;
 132
 133
 134     picture_pool_t *pool;
 135
 136     /* index 0 for normal and 1 for subtitle overlay */
 137     GLuint     program[2];
 138     GLint      shader[3]; //3. is for the common vertex shader
 139     int        local_count;
 140     GLfloat    local_value[16];
 141
 142     /* Shader variables commands*/
 143 #ifdef SUPPORTS_SHADERS
 144     PFNGLGETUNIFORMLOCATIONPROC      GetUniformLocation;
 145     PFNGLGETATTRIBLOCATIONPROC       GetAttribLocation;
 146     PFNGLVERTEXATTRIBPOINTERPROC     VertexAttribPointer;
 147     PFNGLENABLEVERTEXATTRIBARRAYPROC EnableVertexAttribArray;
 148
 149     PFNGLUNIFORM4FVPROC   Uniform4fv;
 150     PFNGLUNIFORM4FPROC    Uniform4f;
 151     PFNGLUNIFORM1IPROC    Uniform1i;
 152
 153     /* Shader command */
 154     PFNGLCREATESHADERPROC CreateShader;
 155     PFNGLSHADERSOURCEPROC ShaderSource;
 156     PFNGLCOMPILESHADERPROC CompileShader;
 157     PFNGLDELETESHADERPROC   DeleteShader;
 158
 159     PFNGLCREATEPROGRAMPROC CreateProgram;
 160     PFNGLLINKPROGRAMPROC   LinkProgram;
 161     PFNGLUSEPROGRAMPROC    UseProgram;
 162     PFNGLDELETEPROGRAMPROC DeleteProgram;
 163
 164     PFNGLATTACHSHADERPROC  AttachShader;
 165
 166     /* Shader log commands */
 167     PFNGLGETPROGRAMIVPROC  GetProgramiv;
 168     PFNGLGETPROGRAMINFOLOGPROC GetProgramInfoLog;
 169     PFNGLGETSHADERIVPROC   GetShaderiv;
 170     PFNGLGETSHADERINFOLOGPROC GetShaderInfoLog;
 171 #endif
 172
 173
 174     /* multitexture */
 175     bool use_multitexture;
 176
 177     /* Non-power-of-2 texture size support */
 178     bool supports_npot;
 179
 180     uint8_t *texture_temp_buf;
 181     int      texture_temp_buf_size;
 182 };
 183
 184 static inline int GetAlignedSize(unsigned size)
 185 {
 186     /* Return the smallest larger or equal power of 2 */
 187     unsigned align = 1 << (8 * sizeof (unsigned) - clz(size));
 188     return ((align >> 1) == size) ? size : align;
 189 }
 190
 191 #if !USE_OPENGL_ES
 192 static bool IsLuminance16Supported(int target)
 193 {
 194     GLuint texture;
 195
 196     glGenTextures(1, &texture);
 197     glBindTexture(target, texture);
 198     glTexImage2D(target, 0, GL_LUMINANCE16,
 199                  64, 64, 0, GL_LUMINANCE, GL_UNSIGNED_SHORT, NULL);
 200     GLint size = 0;
 201     glGetTexLevelParameteriv(target, 0, GL_TEXTURE_LUMINANCE_SIZE, &size);
 202
 203     glDeleteTextures(1, &texture);
 204
 205     return size == 16;
 206 }
 207 #endif
 208
 209 #ifdef SUPPORTS_SHADERS
 210 static void BuildVertexShader(vout_display_opengl_t *vgl,
 211                               GLint *shader)
 212 {
 213     /* Basic vertex shader */
 214     const char *vertexShader =
 215         "#version " GLSL_VERSION "\n"
 216         PRECISION
 217         "varying vec4 TexCoord0,TexCoord1, TexCoord2;"
 218         "attribute vec4 MultiTexCoord0,MultiTexCoord1,MultiTexCoord2;"
 219         "attribute vec4 VertexPosition;"
 220         "void main() {"
 221         " TexCoord0 = MultiTexCoord0;"
 222         " TexCoord1 = MultiTexCoord1;"
 223         " TexCoord2 = MultiTexCoord2;"
 224         " gl_Position = VertexPosition;"
 225         "}";
 226
 227     *shader = vgl->CreateShader(GL_VERTEX_SHADER);
 228     vgl->ShaderSource(*shader, 1, &vertexShader, NULL);
 229     vgl->CompileShader(*shader);
 230 }
 231
 232 static void BuildYUVFragmentShader(vout_display_opengl_t *vgl,
 233                                    GLint *shader,
 234                                    int *local_count,
 235                                    GLfloat *local_value,
 236                                    const video_format_t *fmt,
 237                                    float yuv_range_correction)
 238
 239 {
 240     /* [R/G/B][Y U V O] from TV range to full range
 241      * XXX we could also do hue/brightness/constrast/gamma
 242      * by simply changing the coefficients
 243      */
 244     const float matrix_bt601_tv2full[12] = {
 245         1.164383561643836,  0.0000,             1.596026785714286, -0.874202217873451 ,
 246         1.164383561643836, -0.391762290094914, -0.812967647237771,  0.531667823499146 ,
 247         1.164383561643836,  2.017232142857142,  0.0000,            -1.085630789302022 ,
 248     };
 249     const float matrix_bt709_tv2full[12] = {
 250         1.164383561643836,  0.0000,             1.792741071428571, -0.972945075016308 ,
 251         1.164383561643836, -0.21324861427373,  -0.532909328559444,  0.301482665475862 ,
 252         1.164383561643836,  2.112401785714286,  0.0000,            -1.133402217873451 ,
 253     };
 254     const float (*matrix) = fmt->i_height > 576 ? matrix_bt709_tv2full
 255                                                 : matrix_bt601_tv2full;
 256
 257     /* Basic linear YUV -> RGB conversion using bilinear interpolation */
 258     const char *template_glsl_yuv =
 259         "#version " GLSL_VERSION "\n"
 260         PRECISION
 261         "uniform sampler2D Texture0;"
 262         "uniform sampler2D Texture1;"
 263         "uniform sampler2D Texture2;"
 264         "uniform vec4      Coefficient[4];"
 265         "varying vec4      TexCoord0,TexCoord1,TexCoord2;"
 266
 267         "void main(void) {"
 268         " vec4 x,y,z,result;"
 269         " x  = texture2D(Texture0, TexCoord0.st);"
 270         " %c = texture2D(Texture1, TexCoord1.st);"
 271         " %c = texture2D(Texture2, TexCoord2.st);"
 272
 273         " result = x * Coefficient[0] + Coefficient[3];"
 274         " result = (y * Coefficient[1]) + result;"
 275         " result = (z * Coefficient[2]) + result;"
 276         " gl_FragColor = result;"
 277         "}";
 278     bool swap_uv = fmt->i_chroma == VLC_CODEC_YV12 ||
 279                    fmt->i_chroma == VLC_CODEC_YV9;
 280
 281     char *code;
 282     if (asprintf(&code, template_glsl_yuv,
 283                  swap_uv ? 'z' : 'y',
 284                  swap_uv ? 'y' : 'z') < 0)
 285         code = NULL;
 286
 287     for (int i = 0; i < 4; i++) {
 288         float correction = i < 3 ? yuv_range_correction : 1.0;
 289         /* We place coefficient values for coefficient[4] in one array from matrix values.
 290            Notice that we fill values from top down instead of left to right.*/
 291         for (int j = 0; j < 4; j++)
 292             local_value[*local_count + i*4+j] = j < 3 ? correction * matrix[j*4+i]
 293                                                       : 0.0 ;
 294     }
 295     (*local_count) += 4;
 296
 297
 298     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 299     vgl->ShaderSource(*shader, 1, (const char **)&code, NULL);
 300     vgl->CompileShader(*shader);
 301
 302     free(code);
 303 }
 304
 305 #if 0
 306 static void BuildRGBFragmentShader(vout_display_opengl_t *vgl,
 307                                    GLint *shader)
 308 {
 309     // Simple shader for RGB
 310     const char *code =
 311         "#version " GLSL_VERSION "\n"
 312         PRECISION
 313         "uniform sampler2D Texture[3];"
 314         "varying vec4 TexCoord0,TexCoord1,TexCoord2;"
 315         "void main()"
 316         "{ "
 317         "  gl_FragColor = texture2D(Texture[0], TexCoord0.st);"
 318         "}";
 319     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 320     vgl->ShaderSource(*shader, 1, &code, NULL);
 321     vgl->CompileShader(*shader);
 322 }
 323 #endif
 324
 325 static void BuildRGBAFragmentShader(vout_display_opengl_t *vgl,
 326                                    GLint *shader)
 327 {
 328     // Simple shader for RGBA
 329     const char *code =
 330         "#version " GLSL_VERSION "\n"
 331         PRECISION
 332         "uniform sampler2D Texture;"
 333         "uniform vec4 FillColor;"
 334         "varying vec4 TexCoord0;"
 335         "void main()"
 336         "{ "
 337         "  gl_FragColor = texture2D(Texture, TexCoord0.st) * FillColor;"
 338         "}";
 339     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 340     vgl->ShaderSource(*shader, 1, &code, NULL);
 341     vgl->CompileShader(*shader);
 342 }
 343 #endif
 344
 345 vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
 346                                                const vlc_fourcc_t **subpicture_chromas,
 347                                                vlc_gl_t *gl)
 348 {
 349     vout_display_opengl_t *vgl = calloc(1, sizeof(*vgl));
 350     if (!vgl)
 351         return NULL;
 352
 353     vgl->gl = gl;
 354     if (vlc_gl_Lock(vgl->gl)) {
 355         free(vgl);
 356         return NULL;
 357     }
 358
 359     if (vgl->gl->getProcAddress == NULL) {
 360         fprintf(stderr, "getProcAddress not implemented, bailing out\n");
 361         free(vgl);
 362         return NULL;
 363     }
 364
 365     const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
 366 #if !USE_OPENGL_ES
 367     const unsigned char *ogl_version = glGetString(GL_VERSION);
 368     bool supports_shaders = strverscmp((const char *)ogl_version, "2.0") >= 0;
 369 #else
 370     bool supports_shaders = false;
 371 #endif
 372
 373 #if USE_OPENGL_ES == 2
 374     vgl->CreateShader  = glCreateShader;
 375     vgl->ShaderSource  = glShaderSource;
 376     vgl->CompileShader = glCompileShader;
 377     vgl->AttachShader  = glAttachShader;
 378
 379     vgl->GetProgramiv  = glGetProgramiv;
 380     vgl->GetShaderiv   = glGetShaderiv;
 381     vgl->GetProgramInfoLog  = glGetProgramInfoLog;
 382     vgl->GetShaderInfoLog   = glGetShaderInfoLog;
 383
 384     vgl->DeleteShader  = glDeleteShader;
 385
 386     vgl->GetUniformLocation = glGetUniformLocation;
 387     vgl->GetAttribLocation  = glGetAttribLocation;
 388     vgl->VertexAttribPointer= glVertexAttribPointer;
 389     vgl->EnableVertexAttribArray = glEnableVertexAttribArray;
 390     vgl->Uniform4fv    = glUniform4fv;
 391     vgl->Uniform4f     = glUniform4f;
 392     vgl->Uniform1i     = glUniform1i;
 393
 394     vgl->CreateProgram = glCreateProgram;
 395     vgl->LinkProgram   = glLinkProgram;
 396     vgl->UseProgram    = glUseProgram;
 397     vgl->DeleteProgram = glDeleteProgram;
 398     supports_shaders = true;
 399 #elif defined(SUPPORTS_SHADERS)
 400     vgl->CreateShader  = (PFNGLCREATESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glCreateShader");
 401     vgl->ShaderSource  = (PFNGLSHADERSOURCEPROC)vlc_gl_GetProcAddress(vgl->gl, "glShaderSource");
 402     vgl->CompileShader = (PFNGLCOMPILESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glCompileShader");
 403     vgl->AttachShader  = (PFNGLATTACHSHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glAttachShader");
 404
 405     vgl->GetProgramiv  = (PFNGLGETPROGRAMIVPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetProgramiv");
 406     vgl->GetShaderiv   = (PFNGLGETSHADERIVPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetShaderiv");
 407     vgl->GetProgramInfoLog  = (PFNGLGETPROGRAMINFOLOGPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetProgramInfoLog");
 408     vgl->GetShaderInfoLog   = (PFNGLGETSHADERINFOLOGPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetShaderInfoLog");
 409
 410     vgl->DeleteShader  = (PFNGLDELETESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteShader");
 411
 412     vgl->GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetUniformLocation");
 413     vgl->GetAttribLocation  = (PFNGLGETATTRIBLOCATIONPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetAttribLocation");
 414     vgl->VertexAttribPointer= (PFNGLVERTEXATTRIBPOINTERPROC)vlc_gl_GetProcAddress(vgl->gl, "glVertexAttribPointer");
 415     vgl->EnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)vlc_gl_GetProcAddress(vgl->gl, "glEnableVertexAttribArray");
 416     vgl->Uniform4fv    = (PFNGLUNIFORM4FVPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform4fv");
 417     vgl->Uniform4f     = (PFNGLUNIFORM4FPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform4f");
 418     vgl->Uniform1i     = (PFNGLUNIFORM1IPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform1i");
 419
 420     vgl->CreateProgram = (PFNGLCREATEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glCreateProgram");
 421     vgl->LinkProgram   = (PFNGLLINKPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glLinkProgram");
 422     vgl->UseProgram    = (PFNGLUSEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glUseProgram");
 423     vgl->DeleteProgram = (PFNGLDELETEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteProgram");
 424
 425     if (!vgl->CreateShader || !vgl->ShaderSource || !vgl->CreateProgram)
 426         supports_shaders = false;
 427 #endif
 428
 429     vgl->supports_npot = HasExtension(extensions, "GL_ARB_texture_non_power_of_two") ||
 430                          HasExtension(extensions, "GL_APPLE_texture_2D_limited_npot");
 431
 432 #if USE_OPENGL_ES == 2
 433     /* OpenGL ES 2 includes support for non-power of 2 textures by specification
 434      * so checks for extensions are bound to fail. Check for OpenGL ES version instead. */
 435     vgl->supports_npot = true;
 436 #endif
 437
 438     GLint max_texture_units = 0;
 439     glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_units);
 440
 441 #ifdef __APPLE__
 442 #if USE_OPENGL_ES
 443     /* work-around an iOS 6 bug */
 444     if (kCFCoreFoundationVersionNumber >= 786.)
 445         max_texture_units = 8;
 446     supports_shaders = true;
 447 #endif
 448 #endif
 449
 450     /* Initialize with default chroma */
 451     vgl->fmt = *fmt;
 452     vgl->fmt.i_chroma = VLC_CODEC_RGB32;
 453 #   if defined(WORDS_BIGENDIAN)
 454     vgl->fmt.i_rmask  = 0xff000000;
 455     vgl->fmt.i_gmask  = 0x00ff0000;
 456     vgl->fmt.i_bmask  = 0x0000ff00;
 457 #   else
 458     vgl->fmt.i_rmask  = 0x000000ff;
 459     vgl->fmt.i_gmask  = 0x0000ff00;
 460     vgl->fmt.i_bmask  = 0x00ff0000;
 461 #   endif
 462     vgl->tex_target   = GL_TEXTURE_2D;
 463     vgl->tex_format   = GL_RGBA;
 464     vgl->tex_internal = GL_RGBA;
 465     vgl->tex_type     = GL_UNSIGNED_BYTE;
 466     /* Use YUV if possible and needed */
 467     bool need_fs_yuv = false;
 468     float yuv_range_correction = 1.0;
 469
 470     if (max_texture_units >= 3 && supports_shaders && vlc_fourcc_IsYUV(fmt->i_chroma)) {
 471         const vlc_fourcc_t *list = vlc_fourcc_GetYUVFallback(fmt->i_chroma);
 472         while (*list) {
 473             const vlc_chroma_description_t *dsc = vlc_fourcc_GetChromaDescription(*list);
 474             if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 1) {
 475                 need_fs_yuv       = true;
 476                 vgl->fmt          = *fmt;
 477                 vgl->fmt.i_chroma = *list;
 478                 vgl->tex_format   = GL_LUMINANCE;
 479                 vgl->tex_internal = GL_LUMINANCE;
 480                 vgl->tex_type     = GL_UNSIGNED_BYTE;
 481                 yuv_range_correction = 1.0;
 482                 break;
 483 #if !USE_OPENGL_ES
 484             } else if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 2 &&
 485                        IsLuminance16Supported(vgl->tex_target)) {
 486                 need_fs_yuv       = true;
 487                 vgl->fmt          = *fmt;
 488                 vgl->fmt.i_chroma = *list;
 489                 vgl->tex_format   = GL_LUMINANCE;
 490                 vgl->tex_internal = GL_LUMINANCE16;
 491                 vgl->tex_type     = GL_UNSIGNED_SHORT;
 492                 yuv_range_correction = (float)((1 << 16) - 1) / ((1 << dsc->pixel_bits) - 1);
 493                 break;
 494 #endif
 495             }
 496             list++;
 497         }
 498     }
 499
 500     vgl->chroma = vlc_fourcc_GetChromaDescription(vgl->fmt.i_chroma);
 501     vgl->use_multitexture = vgl->chroma->plane_count > 1;
 502
 503     /* Texture size */
 504     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 505         int w = vgl->fmt.i_width  * vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den;
 506         int h = vgl->fmt.i_height * vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den;
 507         if (vgl->supports_npot) {
 508             vgl->tex_width[j]  = w;
 509             vgl->tex_height[j] = h;
 510         } else {
 511             vgl->tex_width[j]  = GetAlignedSize(w);
 512             vgl->tex_height[j] = GetAlignedSize(h);
 513         }
 514     }
 515
 516     /* Build program if needed */
 517     vgl->program[0] =
 518     vgl->program[1] = 0;
 519     vgl->shader[0] =
 520     vgl->shader[1] =
 521     vgl->shader[2] = -1;
 522     vgl->local_count = 0;
 523     if (supports_shaders && need_fs_yuv) {
 524 #ifdef SUPPORTS_SHADERS
 525         BuildYUVFragmentShader(vgl, &vgl->shader[0], &vgl->local_count,
 526                                vgl->local_value, fmt, yuv_range_correction);
 527         BuildRGBAFragmentShader(vgl, &vgl->shader[1]);
 528         BuildVertexShader(vgl, &vgl->shader[2]);
 529
 530         /* Check shaders messages */
 531         for (unsigned j = 0; j < 3; j++) {
 532             int infoLength;
 533             vgl->GetShaderiv(vgl->shader[j], GL_INFO_LOG_LENGTH, &infoLength);
 534             if (infoLength <= 1)
 535                 continue;
 536
 537             char *infolog = malloc(infoLength);
 538             int charsWritten;
 539             vgl->GetShaderInfoLog(vgl->shader[j], infoLength, &charsWritten, infolog);
 540             fprintf(stderr, "shader %d: %s\n", j, infolog);
 541             free(infolog);
 542         }
 543
 544         vgl->program[0] = vgl->CreateProgram();
 545         vgl->AttachShader(vgl->program[0], vgl->shader[0]);
 546         vgl->AttachShader(vgl->program[0], vgl->shader[2]);
 547         vgl->LinkProgram(vgl->program[0]);
 548
 549         vgl->program[1] = vgl->CreateProgram();
 550         vgl->AttachShader(vgl->program[1], vgl->shader[1]);
 551         vgl->AttachShader(vgl->program[1], vgl->shader[2]);
 552         vgl->LinkProgram(vgl->program[1]);
 553
 554         /* Check program messages */
 555         for (GLuint i = 0; i < 2; i++) {
 556             int infoLength = 0;
 557             vgl->GetProgramiv(vgl->program[i], GL_INFO_LOG_LENGTH, &infoLength);
 558             if (infoLength <= 1)
 559                 continue;
 560             char *infolog = malloc(infoLength);
 561             int charsWritten;
 562             vgl->GetProgramInfoLog(vgl->program[i], infoLength, &charsWritten, infolog);
 563             fprintf(stderr, "shader program %d: %s\n", i, infolog);
 564             free(infolog);
 565
 566             /* If there is some message, better to check linking is ok */
 567             GLint link_status = GL_TRUE;
 568             vgl->GetProgramiv(vgl->program[i], GL_LINK_STATUS, &link_status);
 569             if (link_status == GL_FALSE) {
 570                 fprintf(stderr, "Unable to use program %d\n", i);
 571                 free(vgl);
 572                 return NULL;
 573             }
 574         }
 575 #endif
 576     }
 577
 578     /* */
 579     glDisable(GL_BLEND);
 580     glDisable(GL_DEPTH_TEST);
 581     glDepthMask(GL_FALSE);
 582     glDisable(GL_CULL_FACE);
 583     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 584     glClear(GL_COLOR_BUFFER_BIT);
 585
 586     vlc_gl_Unlock(vgl->gl);
 587
 588     /* */
 589     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 590         for (int j = 0; j < PICTURE_PLANE_MAX; j++)
 591             vgl->texture[i][j] = 0;
 592     }
 593     vgl->region_count = 0;
 594     vgl->region = NULL;
 595     vgl->pool = NULL;
 596
 597     *fmt = vgl->fmt;
 598     if (subpicture_chromas) {
 599         *subpicture_chromas = gl_subpicture_chromas;
 600     }
 601     return vgl;
 602 }
 603
 604 void vout_display_opengl_Delete(vout_display_opengl_t *vgl)
 605 {
 606     /* */
 607     if (!vlc_gl_Lock(vgl->gl)) {
 608         glFinish();
 609         glFlush();
 610         for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++)
 611             glDeleteTextures(vgl->chroma->plane_count, vgl->texture[i]);
 612         for (int i = 0; i < vgl->region_count; i++) {
 613             if (vgl->region[i].texture)
 614                 glDeleteTextures(1, &vgl->region[i].texture);
 615         }
 616         free(vgl->region);
 617
 618 #ifdef SUPPORTS_SHADERS
 619         if (vgl->program[0]) {
 620             for (int i = 0; i < 2; i++)
 621                 vgl->DeleteProgram(vgl->program[i]);
 622             for (int i = 0; i < 3; i++)
 623                 vgl->DeleteShader(vgl->shader[i]);
 624         }
 625 #endif
 626
 627         free(vgl->texture_temp_buf);
 628         vlc_gl_Unlock(vgl->gl);
 629     }
 630     if (vgl->pool)
 631         picture_pool_Delete(vgl->pool);
 632     free(vgl);
 633 }
 634
 635 picture_pool_t *vout_display_opengl_GetPool(vout_display_opengl_t *vgl, unsigned requested_count)
 636 {
 637     if (vgl->pool)
 638         return vgl->pool;
 639
 640     /* Allocate our pictures */
 641     picture_t *picture[VLCGL_PICTURE_MAX] = {NULL, };
 642     unsigned count;
 643
 644     for (count = 0; count < __MIN(VLCGL_PICTURE_MAX, requested_count); count++) {
 645         picture[count] = picture_NewFromFormat(&vgl->fmt);
 646         if (!picture[count])
 647             break;
 648     }
 649     if (count <= 0)
 650         return NULL;
 651
 652     /* Wrap the pictures into a pool */
 653     picture_pool_configuration_t cfg;
 654     memset(&cfg, 0, sizeof(cfg));
 655     cfg.picture_count = count;
 656     cfg.picture       = picture;
 657     vgl->pool = picture_pool_NewExtended(&cfg);
 658     if (!vgl->pool)
 659         goto error;
 660
 661     /* Allocates our textures */
 662     if (vlc_gl_Lock(vgl->gl))
 663         return vgl->pool;
 664
 665     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 666         glGenTextures(vgl->chroma->plane_count, vgl->texture[i]);
 667         for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 668             if (vgl->use_multitexture) {
 669                 glActiveTexture(GL_TEXTURE0 + j);
 670                 glClientActiveTexture(GL_TEXTURE0 + j);
 671             }
 672             glBindTexture(vgl->tex_target, vgl->texture[i][j]);
 673
 674 #if !USE_OPENGL_ES
 675             /* Set the texture parameters */
 676             glTexParameterf(vgl->tex_target, GL_TEXTURE_PRIORITY, 1.0);
 677             glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 678 #endif
 679
 680             glTexParameteri(vgl->tex_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 681             glTexParameteri(vgl->tex_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 682             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 683             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 684
 685             /* Call glTexImage2D only once, and use glTexSubImage2D later */
 686             glTexImage2D(vgl->tex_target, 0,
 687                          vgl->tex_internal, vgl->tex_width[j], vgl->tex_height[j],
 688                          0, vgl->tex_format, vgl->tex_type, NULL);
 689         }
 690     }
 691
 692     vlc_gl_Unlock(vgl->gl);
 693
 694     return vgl->pool;
 695
 696 error:
 697     for (unsigned i = 0; i < count; i++)
 698         picture_Release(picture[i]);
 699     return NULL;
 700 }
 701
 702 #define ALIGN(x, y) (((x) + ((y) - 1)) & ~((y) - 1))
 703 static void Upload(vout_display_opengl_t *vgl, int in_width, int in_height,
 704                    int in_full_width, int in_full_height,
 705                    int w_num, int w_den, int h_num, int h_den,
 706                    int pitch, int pixel_pitch,
 707                    int full_upload, const uint8_t *pixels,
 708                    int tex_target, int tex_format, int tex_type)
 709 {
 710     int width       =       in_width * w_num / w_den;
 711     int full_width  =  in_full_width * w_num / w_den;
 712     int height      =      in_height * h_num / h_den;
 713     int full_height = in_full_height * h_num / h_den;
 714     // This unpack alignment is the default, but setting it just in case.
 715     glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
 716 #ifndef GL_UNPACK_ROW_LENGTH
 717     int dst_width = full_upload ? full_width : width;
 718     int dst_pitch = ALIGN(dst_width * pixel_pitch, 4);
 719     if ( pitch != dst_pitch )
 720     {
 721         int buf_size = dst_pitch * full_height * pixel_pitch;
 722         const uint8_t *source = pixels;
 723         uint8_t *destination;
 724         if( !vgl->texture_temp_buf || vgl->texture_temp_buf_size < buf_size )
 725         {
 726             free( vgl->texture_temp_buf );
 727             vgl->texture_temp_buf = xmalloc( buf_size );
 728             vgl->texture_temp_buf_size = buf_size;
 729         }
 730         destination = vgl->texture_temp_buf;
 731
 732         for( int h = 0; h < height ; h++ )
 733         {
 734             memcpy( destination, source, width * pixel_pitch );
 735             source += pitch;
 736             destination += dst_pitch;
 737         }
 738         if (full_upload)
 739             glTexImage2D( tex_target, 0, tex_format,
 740                           full_width, full_height,
 741                           0, tex_format, tex_type, vgl->texture_temp_buf );
 742         else
 743             glTexSubImage2D( tex_target, 0,
 744                              0, 0,
 745                              width, height,
 746                              tex_format, tex_type, vgl->texture_temp_buf );
 747     } else {
 748 #else
 749     (void) width;
 750     (void) height;
 751     (void) vgl;
 752     {
 753         glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch / pixel_pitch);
 754 #endif
 755         if (full_upload)
 756             glTexImage2D(tex_target, 0, tex_format,
 757                          full_width, full_height,
 758                          0, tex_format, tex_type, pixels);
 759         else
 760             glTexSubImage2D(tex_target, 0,
 761                             0, 0,
 762                             width, height,
 763                             tex_format, tex_type, pixels);
 764     }
 765 }
 766
 767 int vout_display_opengl_Prepare(vout_display_opengl_t *vgl,
 768                                 picture_t *picture, subpicture_t *subpicture)
 769 {
 770     if (vlc_gl_Lock(vgl->gl))
 771         return VLC_EGENERIC;
 772
 773     /* Update the texture */
 774     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 775         if (vgl->use_multitexture) {
 776             glActiveTexture(GL_TEXTURE0 + j);
 777             glClientActiveTexture(GL_TEXTURE0 + j);
 778         }
 779         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 780
 781         Upload(vgl, picture->format.i_visible_width, vgl->fmt.i_visible_height,
 782                vgl->fmt.i_width, vgl->fmt.i_height,
 783                vgl->chroma->p[j].w.num, vgl->chroma->p[j].w.den, vgl->chroma->p[j].h.num, vgl->chroma->p[j].h.den,
 784                picture->p[j].i_pitch, picture->p[j].i_pixel_pitch, 0, picture->p[j].p_pixels, vgl->tex_target, vgl->tex_format, vgl->tex_type);
 785     }
 786
 787     int         last_count = vgl->region_count;
 788     gl_region_t *last = vgl->region;
 789
 790     vgl->region_count = 0;
 791     vgl->region       = NULL;
 792
 793     if (subpicture) {
 794
 795         int count = 0;
 796         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next)
 797             count++;
 798
 799         vgl->region_count = count;
 800         vgl->region       = calloc(count, sizeof(*vgl->region));
 801
 802         if (vgl->use_multitexture) {
 803             glActiveTexture(GL_TEXTURE0 + 0);
 804             glClientActiveTexture(GL_TEXTURE0 + 0);
 805         }
 806         int i = 0;
 807         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next, i++) {
 808             gl_region_t *glr = &vgl->region[i];
 809
 810             glr->format = GL_RGBA;
 811             glr->type   = GL_UNSIGNED_BYTE;
 812             glr->width  = r->fmt.i_visible_width;
 813             glr->height = r->fmt.i_visible_height;
 814             if (!vgl->supports_npot) {
 815                 glr->width  = GetAlignedSize(glr->width);
 816                 glr->height = GetAlignedSize(glr->height);
 817                 glr->tex_width  = (float) r->fmt.i_visible_width  / glr->width;
 818                 glr->tex_height = (float) r->fmt.i_visible_height / glr->height;
 819             } else {
 820                 glr->tex_width  = 1.0;
 821                 glr->tex_height = 1.0;
 822             }
 823             glr->alpha  = (float)subpicture->i_alpha * r->i_alpha / 255 / 255;
 824             glr->left   =  2.0 * (r->i_x                          ) / subpicture->i_original_picture_width  - 1.0;
 825             glr->top    = -2.0 * (r->i_y                          ) / subpicture->i_original_picture_height + 1.0;
 826             glr->right  =  2.0 * (r->i_x + r->fmt.i_visible_width ) / subpicture->i_original_picture_width  - 1.0;
 827             glr->bottom = -2.0 * (r->i_y + r->fmt.i_visible_height) / subpicture->i_original_picture_height + 1.0;
 828
 829             glr->texture = 0;
 830             for (int j = 0; j < last_count; j++) {
 831                 if (last[j].texture &&
 832                     last[j].width  == glr->width &&
 833                     last[j].height == glr->height &&
 834                     last[j].format == glr->format &&
 835                     last[j].type   == glr->type) {
 836                     glr->texture = last[j].texture;
 837                     memset(&last[j], 0, sizeof(last[j]));
 838                     break;
 839                 }
 840             }
 841
 842             const int pixels_offset = r->fmt.i_y_offset * r->p_picture->p->i_pitch +
 843                                       r->fmt.i_x_offset * r->p_picture->p->i_pixel_pitch;
 844             if (glr->texture) {
 845                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 846                 Upload(vgl, r->fmt.i_visible_width, r->fmt.i_visible_height, glr->width, glr->height, 1, 1, 1, 1,
 847                        r->p_picture->p->i_pitch, r->p_picture->p->i_pixel_pitch, 0,
 848                        &r->p_picture->p->p_pixels[pixels_offset], GL_TEXTURE_2D, glr->format, glr->type);
 849             } else {
 850                 glGenTextures(1, &glr->texture);
 851                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 852 #if !USE_OPENGL_ES
 853                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 1.0);
 854                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 855 #endif
 856                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 857                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 858                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 859                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 860                 Upload(vgl, r->fmt.i_visible_width, r->fmt.i_visible_height, glr->width, glr->height, 1, 1, 1, 1,
 861                        r->p_picture->p->i_pitch, r->p_picture->p->i_pixel_pitch, 1,
 862                        &r->p_picture->p->p_pixels[pixels_offset], GL_TEXTURE_2D, glr->format, glr->type);
 863             }
 864         }
 865     }
 866     for (int i = 0; i < last_count; i++) {
 867         if (last[i].texture)
 868             glDeleteTextures(1, &last[i].texture);
 869     }
 870     free(last);
 871
 872     vlc_gl_Unlock(vgl->gl);
 873     VLC_UNUSED(subpicture);
 874     return VLC_SUCCESS;
 875 }
 876
 877 #ifdef SUPPORTS_FIXED_PIPELINE
 878 static void DrawWithoutShaders(vout_display_opengl_t *vgl,
 879                                float *left, float *top, float *right, float *bottom)
 880 {
 881     static const GLfloat vertexCoord[] = {
 882         -1.0f, -1.0f,
 883          1.0f, -1.0f,
 884         -1.0f,  1.0f,
 885          1.0f,  1.0f,
 886     };
 887
 888     const GLfloat textureCoord[] = {
 889         left[0],  bottom[0],
 890         right[0], bottom[0],
 891         left[0],  top[0],
 892         right[0], top[0]
 893     };
 894
 895     glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
 896     glEnable(vgl->tex_target);
 897     glActiveTexture(GL_TEXTURE0 + 0);
 898     glClientActiveTexture(GL_TEXTURE0 + 0);
 899
 900     glBindTexture(vgl->tex_target, vgl->texture[0][0]);
 901
 902     glEnableClientState(GL_VERTEX_ARRAY);
 903     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 904
 905     glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
 906     glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
 907
 908     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 909
 910     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 911     glDisableClientState(GL_VERTEX_ARRAY);
 912     glDisable(vgl->tex_target);
 913 }
 914 #endif
 915
 916 #ifdef SUPPORTS_SHADERS
 917 static void DrawWithShaders(vout_display_opengl_t *vgl,
 918                             float *left, float *top, float *right, float *bottom)
 919 {
 920     vgl->UseProgram(vgl->program[0]);
 921     vgl->Uniform4fv(vgl->GetUniformLocation(vgl->program[0], "Coefficient"), 4, vgl->local_value);
 922     vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture0"), 0);
 923     vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture1"), 1);
 924     vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture2"), 2);
 925
 926     static const GLfloat vertexCoord[] = {
 927         -1.0,  1.0,
 928         -1.0, -1.0,
 929          1.0,  1.0,
 930          1.0, -1.0,
 931     };
 932
 933     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 934         const GLfloat textureCoord[] = {
 935             left[j],  top[j],
 936             left[j],  bottom[j],
 937             right[j], top[j],
 938             right[j], bottom[j],
 939         };
 940         glActiveTexture(GL_TEXTURE0+j);
 941         glClientActiveTexture(GL_TEXTURE0+j);
 942         glEnable(vgl->tex_target);
 943         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 944
 945         char attribute[20];
 946         snprintf(attribute, sizeof(attribute), "MultiTexCoord%1d", j);
 947         vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[0], attribute));
 948         vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[0], attribute), 2, GL_FLOAT, 0, 0, textureCoord);
 949     }
 950     glActiveTexture(GL_TEXTURE0 + 0);
 951     glClientActiveTexture(GL_TEXTURE0 + 0);
 952     vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[0], "VertexPosition"));
 953     vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[0], "VertexPosition"), 2, GL_FLOAT, 0, 0, vertexCoord);
 954
 955     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 956 }
 957 #endif
 958
 959 int vout_display_opengl_Display(vout_display_opengl_t *vgl,
 960                                 const video_format_t *source)
 961 {
 962     if (vlc_gl_Lock(vgl->gl))
 963         return VLC_EGENERIC;
 964
 965     /* Why drawing here and not in Render()? Because this way, the
 966        OpenGL providers can call vout_display_opengl_Display to force redraw.i
 967        Currently, the OS X provider uses it to get a smooth window resizing */
 968     glClear(GL_COLOR_BUFFER_BIT);
 969
 970     /* Draw the picture */
 971     float left[PICTURE_PLANE_MAX];
 972     float top[PICTURE_PLANE_MAX];
 973     float right[PICTURE_PLANE_MAX];
 974     float bottom[PICTURE_PLANE_MAX];
 975     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 976         /* glTexCoord works differently with GL_TEXTURE_2D and
 977            GL_TEXTURE_RECTANGLE_EXT */
 978         float scale_w, scale_h;
 979
 980         if (vgl->tex_target == GL_TEXTURE_2D) {
 981             scale_w = (float)vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den / vgl->tex_width[j];
 982             scale_h = (float)vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den / vgl->tex_height[j];
 983
 984         } else {
 985             scale_w = 1.0;
 986             scale_h = 1.0;
 987         }
 988         left[j]   = (source->i_x_offset +                       0 ) * scale_w;
 989         top[j]    = (source->i_y_offset +                       0 ) * scale_h;
 990         right[j]  = (source->i_x_offset + source->i_visible_width ) * scale_w;
 991         bottom[j] = (source->i_y_offset + source->i_visible_height) * scale_h;
 992     }
 993
 994 #ifdef SUPPORTS_SHADERS
 995     if (vgl->program[0])
 996         DrawWithShaders(vgl, left, top ,right, bottom);
 997     else
 998 #endif
 999     {
1000 #ifdef SUPPORTS_FIXED_PIPELINE
1001         DrawWithoutShaders(vgl, left, top, right, bottom);
1002 #endif
1003     }
1004
1005     /* Draw the subpictures */
1006     if (vgl->program[1]) {
1007 #ifdef SUPPORTS_SHADERS
1008         // Change the program for overlays
1009         vgl->UseProgram(vgl->program[1]);
1010         vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[1], "Texture"), 0);
1011 #endif
1012     }
1013
1014     glEnable(GL_TEXTURE_2D);
1015     glEnable(GL_BLEND);
1016     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1017
1018     glActiveTexture(GL_TEXTURE0 + 0);
1019     glClientActiveTexture(GL_TEXTURE0 + 0);
1020     for (int i = 0; i < vgl->region_count; i++) {
1021         gl_region_t *glr = &vgl->region[i];
1022         const GLfloat vertexCoord[] = {
1023             glr->left,  glr->top,
1024             glr->left,  glr->bottom,
1025             glr->right, glr->top,
1026             glr->right, glr->bottom,
1027         };
1028         const GLfloat textureCoord[] = {
1029             0.0, 0.0,
1030             0.0, glr->tex_height,
1031             glr->tex_width, 0.0,
1032             glr->tex_width, glr->tex_height,
1033         };
1034
1035         glBindTexture(GL_TEXTURE_2D, glr->texture);
1036         if (vgl->program[1]) {
1037 #ifdef SUPPORTS_SHADERS
1038             vgl->Uniform4f(vgl->GetUniformLocation(vgl->program[1], "FillColor"), 1.0f, 1.0f, 1.0f, glr->alpha);
1039             vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[1], "MultiTexCoord0"));
1040             vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[1], "MultiTexCoord0"), 2, GL_FLOAT, 0, 0, textureCoord);
1041             vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[1], "VertexPosition"));
1042             vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[1], "VertexPosition"), 2, GL_FLOAT, 0, 0, vertexCoord);
1043 #endif
1044         } else {
1045 #ifdef SUPPORTS_FIXED_PIPELINE
1046             glEnableClientState(GL_VERTEX_ARRAY);
1047             glEnableClientState(GL_TEXTURE_COORD_ARRAY);
1048             glColor4f(1.0f, 1.0f, 1.0f, glr->alpha);
1049             glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
1050             glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
1051 #endif
1052         }
1053
1054         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1055
1056         if (!vgl->program[1]) {
1057 #ifdef SUPPORTS_FIXED_PIPELINE
1058             glDisableClientState(GL_TEXTURE_COORD_ARRAY);
1059             glDisableClientState(GL_VERTEX_ARRAY);
1060 #endif
1061         }
1062     }
1063     glDisable(GL_BLEND);
1064     glDisable(GL_TEXTURE_2D);
1065
1066     /* Display */
1067     vlc_gl_Swap(vgl->gl);
1068
1069     vlc_gl_Unlock(vgl->gl);
1070     return VLC_SUCCESS;
1071 }
1072