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) 2004-2012 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  *          Ilkka Ollakka <ileoo@videolan.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 #ifdef __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 USE_OPENGL_ES
  65 #   define GL_UNPACK_ROW_LENGTH 0
  66 #   import <CoreFoundation/CoreFoundation.h>
  67 #endif
  68 #endif
  69
  70 #if USE_OPENGL_ES
  71 #   define GLSL_VERSION "100"
  72 #   define VLCGL_TEXTURE_COUNT 1
  73 #   define VLCGL_PICTURE_MAX 1
  74 #else
  75 #   define GLSL_VERSION "120"
  76 #   define VLCGL_TEXTURE_COUNT 1
  77 #   define VLCGL_PICTURE_MAX 128
  78 #endif
  79
  80 static const vlc_fourcc_t gl_subpicture_chromas[] = {
  81     VLC_CODEC_RGBA,
  82     0
  83 };
  84
  85 typedef struct {
  86     GLuint   texture;
  87     unsigned format;
  88     unsigned type;
  89     unsigned width;
  90     unsigned height;
  91
  92     float    alpha;
  93
  94     float    top;
  95     float    left;
  96     float    bottom;
  97     float    right;
  98 } gl_region_t;
  99
 100 struct vout_display_opengl_t {
 101
 102     vlc_gl_t   *gl;
 103
 104     video_format_t fmt;
 105     const vlc_chroma_description_t *chroma;
 106
 107     int        tex_target;
 108     int        tex_format;
 109     int        tex_internal;
 110     int        tex_type;
 111
 112     int        tex_width[PICTURE_PLANE_MAX];
 113     int        tex_height[PICTURE_PLANE_MAX];
 114
 115     GLuint     texture[VLCGL_TEXTURE_COUNT][PICTURE_PLANE_MAX];
 116
 117     int         region_count;
 118     gl_region_t *region;
 119
 120
 121     picture_pool_t *pool;
 122
 123     /* index 0 for normal and 1 for subtitle overlay */
 124     GLuint     program[2];
 125     GLint      shader[3]; //3. is for the common vertex shader
 126     int        local_count;
 127     GLfloat    local_value[16];
 128
 129     /* Shader variables commands*/
 130     PFNGLGETUNIFORMLOCATIONPROC      GetUniformLocation;
 131     PFNGLGETATTRIBLOCATIONPROC       GetAttribLocation;
 132     PFNGLVERTEXATTRIBPOINTERPROC     VertexAttribPointer;
 133     PFNGLENABLEVERTEXATTRIBARRAYPROC EnableVertexAttribArray;
 134
 135     PFNGLUNIFORM4FVPROC   Uniform4fv;
 136     PFNGLUNIFORM4FPROC    Uniform4f;
 137     PFNGLUNIFORM1IPROC    Uniform1i;
 138
 139     /* Shader command */
 140     PFNGLCREATESHADERPROC CreateShader;
 141     PFNGLSHADERSOURCEPROC ShaderSource;
 142     PFNGLCOMPILESHADERPROC CompileShader;
 143     PFNGLDELETESHADERPROC   DeleteShader;
 144
 145     PFNGLCREATEPROGRAMPROC CreateProgram;
 146     PFNGLLINKPROGRAMPROC   LinkProgram;
 147     PFNGLUSEPROGRAMPROC    UseProgram;
 148     PFNGLDELETEPROGRAMPROC DeleteProgram;
 149
 150     PFNGLATTACHSHADERPROC  AttachShader;
 151
 152     /* Shader log commands */
 153     PFNGLGETPROGRAMIVPROC  GetProgramiv;
 154     PFNGLGETPROGRAMINFOLOGPROC GetProgramInfoLog;
 155     PFNGLGETSHADERIVPROC   GetShaderiv;
 156     PFNGLGETSHADERINFOLOGPROC GetShaderInfoLog;
 157
 158
 159     /* multitexture */
 160     bool use_multitexture;
 161
 162     /* Non-power-of-2 texture size support */
 163     bool supports_npot;
 164 };
 165
 166 static inline int GetAlignedSize(unsigned size)
 167 {
 168     /* Return the smallest larger or equal power of 2 */
 169     unsigned align = 1 << (8 * sizeof (unsigned) - clz(size));
 170     return ((align >> 1) == size) ? size : align;
 171 }
 172
 173 #if !USE_OPENGL_ES
 174 static bool IsLuminance16Supported(int target)
 175 {
 176     GLuint texture;
 177
 178     glGenTextures(1, &texture);
 179     glBindTexture(target, texture);
 180     glTexImage2D(target, 0, GL_LUMINANCE16,
 181                  64, 64, 0, GL_LUMINANCE, GL_UNSIGNED_SHORT, NULL);
 182     GLint size = 0;
 183     glGetTexLevelParameteriv(target, 0, GL_TEXTURE_LUMINANCE_SIZE, &size);
 184
 185     glDeleteTextures(1, &texture);
 186
 187     return size == 16;
 188 }
 189 #endif
 190
 191 static void BuildVertexShader(vout_display_opengl_t *vgl,
 192                               GLint *shader)
 193 {
 194     /* Basic vertex shader */
 195     const char *vertexShader =
 196         "#version " GLSL_VERSION "\n"
 197         "precision highp float;"
 198         "varying vec4 TexCoord0,TexCoord1, TexCoord2;"
 199         "attribute vec4 MultiTexCoord0,MultiTexCoord1,MultiTexCoord2;"
 200         "attribute vec4 VertexPosition;"
 201         "void main() {"
 202         " TexCoord0 = MultiTexCoord0;"
 203         " TexCoord1 = MultiTexCoord1;"
 204         " TexCoord2 = MultiTexCoord2;"
 205         " gl_Position = VertexPosition;"
 206         "}";
 207
 208     *shader = vgl->CreateShader(GL_VERTEX_SHADER);
 209     vgl->ShaderSource(*shader, 1, &vertexShader, NULL);
 210     vgl->CompileShader(*shader);
 211 }
 212
 213 static void BuildYUVFragmentShader(vout_display_opengl_t *vgl,
 214                                    GLint *shader,
 215                                    int *local_count,
 216                                    GLfloat *local_value,
 217                                    const video_format_t *fmt,
 218                                    float yuv_range_correction)
 219
 220 {
 221     /* [R/G/B][Y U V O] from TV range to full range
 222      * XXX we could also do hue/brightness/constrast/gamma
 223      * by simply changing the coefficients
 224      */
 225     const float matrix_bt601_tv2full[12] = {
 226         1.164383561643836,  0.0000,             1.596026785714286, -0.874202217873451 ,
 227         1.164383561643836, -0.391762290094914, -0.812967647237771,  0.531667823499146 ,
 228         1.164383561643836,  2.017232142857142,  0.0000,            -1.085630789302022 ,
 229     };
 230     const float matrix_bt709_tv2full[12] = {
 231         1.164383561643836,  0.0000,             1.792741071428571, -0.972945075016308 ,
 232         1.164383561643836, -0.21324861427373,  -0.532909328559444,  0.301482665475862 ,
 233         1.164383561643836,  2.112401785714286,  0.0000,            -1.133402217873451 ,
 234     };
 235     const float (*matrix) = fmt->i_height > 576 ? matrix_bt709_tv2full
 236                                                 : matrix_bt601_tv2full;
 237
 238     /* Basic linear YUV -> RGB conversion using bilinear interpolation */
 239     const char *template_glsl_yuv =
 240         "#version " GLSL_VERSION "\n"
 241         "precision highp float;"
 242         "uniform sampler2D Texture0;"
 243         "uniform sampler2D Texture1;"
 244         "uniform sampler2D Texture2;"
 245         "uniform vec4      Coefficient[4];"
 246         "varying vec4      TexCoord0,TexCoord1,TexCoord2;"
 247
 248         "void main(void) {"
 249         " vec4 x,y,z,result;"
 250         " x  = texture2D(Texture0, TexCoord0.st);"
 251         " %c = texture2D(Texture1, TexCoord1.st);"
 252         " %c = texture2D(Texture2, TexCoord2.st);"
 253
 254         " result = x * Coefficient[0] + Coefficient[3];"
 255         " result = (y * Coefficient[1]) + result;"
 256         " result = (z * Coefficient[2]) + result;"
 257         " gl_FragColor = result;"
 258         "}";
 259     bool swap_uv = fmt->i_chroma == VLC_CODEC_YV12 ||
 260                    fmt->i_chroma == VLC_CODEC_YV9;
 261
 262     char *code;
 263     if (asprintf(&code, template_glsl_yuv,
 264                  swap_uv ? 'z' : 'y',
 265                  swap_uv ? 'y' : 'z') < 0)
 266         code = NULL;
 267
 268     for (int i = 0; i < 4; i++) {
 269         float correction = i < 3 ? yuv_range_correction : 1.0;
 270         /* We place coefficient values for coefficient[4] in one array from matrix values.
 271            Notice that we fill values from top down instead of left to right.*/
 272         for (int j = 0; j < 4; j++)
 273             local_value[*local_count + i*4+j] = j < 3 ? correction * matrix[j*4+i]
 274                                                       : 0.0 ;
 275     }
 276     (*local_count) += 4;
 277
 278
 279     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 280     vgl->ShaderSource(*shader, 1, (const char **)&code, NULL);
 281     vgl->CompileShader(*shader);
 282
 283     free(code);
 284 }
 285
 286 static void BuildRGBFragmentShader(vout_display_opengl_t *vgl,
 287                                    GLint *shader)
 288 {
 289     // Simple shader for RGB
 290     const char *code =
 291         "#version " GLSL_VERSION "\n"
 292         "precision highp float;"
 293         "uniform sampler2D Texture[3];"
 294         "varying vec4 TexCoord0,TexCoord1,TexCoord2;"
 295         "void main()"
 296         "{ "
 297         "  gl_FragColor = texture2D(Texture[0], TexCoord0.st);"
 298         "}";
 299     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 300     vgl->ShaderSource(*shader, 1, &code, NULL);
 301     vgl->CompileShader(*shader);
 302 }
 303
 304 static void BuildRGBAFragmentShader(vout_display_opengl_t *vgl,
 305                                    GLint *shader)
 306 {
 307     // Simple shader for RGBA
 308     const char *code =
 309         "#version " GLSL_VERSION "\n"
 310         "precision highp float;"
 311         "uniform sampler2D Texture;"
 312         "uniform vec4 FillColor;"
 313         "varying vec4 TexCoord0;"
 314         "void main()"
 315         "{ "
 316         "  gl_FragColor = texture2D(Texture, TexCoord0.st) * FillColor;"
 317         "}";
 318     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 319     vgl->ShaderSource(*shader, 1, &code, NULL);
 320     vgl->CompileShader(*shader);
 321 }
 322
 323 vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
 324                                                const vlc_fourcc_t **subpicture_chromas,
 325                                                vlc_gl_t *gl)
 326 {
 327     vout_display_opengl_t *vgl = calloc(1, sizeof(*vgl));
 328     if (!vgl)
 329         return NULL;
 330
 331     vgl->gl = gl;
 332     if (vlc_gl_Lock(vgl->gl)) {
 333         free(vgl);
 334         return NULL;
 335     }
 336
 337     if (vgl->gl->getProcAddress == NULL) {
 338         fprintf(stderr, "getProcAddress not implemented, bailing out\n");
 339         free(vgl);
 340         return NULL;
 341     }
 342
 343     const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
 344 #if !USE_OPENGL_ES
 345     const unsigned char *ogl_version = glGetString(GL_VERSION);
 346     bool supports_shaders = strverscmp((const char *)ogl_version, "2.0") >= 0;
 347 #else
 348     bool supports_shaders = false;
 349 #endif
 350
 351     vgl->CreateShader  = (PFNGLCREATESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glCreateShader");
 352     vgl->ShaderSource  = (PFNGLSHADERSOURCEPROC)vlc_gl_GetProcAddress(vgl->gl, "glShaderSource");
 353     vgl->CompileShader = (PFNGLCOMPILESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glCompileShader");
 354     vgl->AttachShader  = (PFNGLATTACHSHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glAttachShader");
 355
 356     vgl->GetProgramiv  = (PFNGLGETPROGRAMIVPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetProgramiv");
 357     vgl->GetShaderiv   = (PFNGLGETSHADERIVPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetShaderiv");
 358     vgl->GetProgramInfoLog  = (PFNGLGETPROGRAMINFOLOGPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetProgramInfoLog");
 359     vgl->GetShaderInfoLog   = (PFNGLGETSHADERINFOLOGPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetShaderInfoLog");
 360
 361     vgl->DeleteShader  = (PFNGLDELETESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteShader");
 362
 363     vgl->GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetUniformLocation");
 364     vgl->GetAttribLocation  = (PFNGLGETATTRIBLOCATIONPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetAttribLocation");
 365     vgl->VertexAttribPointer= (PFNGLVERTEXATTRIBPOINTERPROC)vlc_gl_GetProcAddress(vgl->gl, "glVertexAttribPointer");
 366     vgl->EnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)vlc_gl_GetProcAddress(vgl->gl, "glEnableVertexAttribArray");
 367     vgl->Uniform4fv    = (PFNGLUNIFORM4FVPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform4fv");
 368     vgl->Uniform4f     = (PFNGLUNIFORM4FPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform4f");
 369     vgl->Uniform1i     = (PFNGLUNIFORM1IPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform1i");
 370
 371     vgl->CreateProgram = (PFNGLCREATEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glCreateProgram");
 372     vgl->LinkProgram   = (PFNGLLINKPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glLinkProgram");
 373     vgl->UseProgram    = (PFNGLUSEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glUseProgram");
 374     vgl->DeleteProgram = (PFNGLDELETEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteProgram");
 375
 376     if (!vgl->CreateShader || !vgl->ShaderSource || !vgl->CreateProgram)
 377         supports_shaders = false;
 378
 379     vgl->supports_npot = HasExtension(extensions, "GL_ARB_texture_non_power_of_two") ||
 380                          HasExtension(extensions, "GL_APPLE_texture_2D_limited_npot");
 381
 382     GLint max_texture_units = 0;
 383     glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_units);
 384
 385 #ifdef __APPLE__
 386 #if USE_OPENGL_ES
 387     /* work-around an iOS 6 bug */
 388     if (kCFCoreFoundationVersionNumber >= 786.)
 389         max_texture_units = 8;
 390     supports_shaders = true;
 391 #endif
 392 #endif
 393
 394     /* Initialize with default chroma */
 395     vgl->fmt = *fmt;
 396     vgl->fmt.i_chroma = VLC_CODEC_RGB32;
 397 #   if defined(WORDS_BIGENDIAN)
 398     vgl->fmt.i_rmask  = 0xff000000;
 399     vgl->fmt.i_gmask  = 0x00ff0000;
 400     vgl->fmt.i_bmask  = 0x0000ff00;
 401 #   else
 402     vgl->fmt.i_rmask  = 0x000000ff;
 403     vgl->fmt.i_gmask  = 0x0000ff00;
 404     vgl->fmt.i_bmask  = 0x00ff0000;
 405 #   endif
 406     vgl->tex_target   = GL_TEXTURE_2D;
 407     vgl->tex_format   = GL_RGBA;
 408     vgl->tex_internal = GL_RGBA;
 409     vgl->tex_type     = GL_UNSIGNED_BYTE;
 410     /* Use YUV if possible and needed */
 411     bool need_fs_yuv = false;
 412     float yuv_range_correction = 1.0;
 413
 414     if (max_texture_units >= 3 && supports_shaders &&
 415         vlc_fourcc_IsYUV(fmt->i_chroma) && !vlc_fourcc_IsYUV(vgl->fmt.i_chroma)) {
 416         printf("passed check\n");
 417         const vlc_fourcc_t *list = vlc_fourcc_GetYUVFallback(fmt->i_chroma);
 418         while (*list) {
 419             const vlc_chroma_description_t *dsc = vlc_fourcc_GetChromaDescription(*list);
 420             if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 1) {
 421                 need_fs_yuv       = true;
 422                 vgl->fmt          = *fmt;
 423                 vgl->fmt.i_chroma = *list;
 424                 vgl->tex_format   = GL_LUMINANCE;
 425                 vgl->tex_internal = GL_LUMINANCE;
 426                 vgl->tex_type     = GL_UNSIGNED_BYTE;
 427                 yuv_range_correction = 1.0;
 428                 break;
 429 #if !USE_OPENGL_ES
 430             } else if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 2 &&
 431                        IsLuminance16Supported(vgl->tex_target)) {
 432                 need_fs_yuv       = true;
 433                 vgl->fmt          = *fmt;
 434                 vgl->fmt.i_chroma = *list;
 435                 vgl->tex_format   = GL_LUMINANCE;
 436                 vgl->tex_internal = GL_LUMINANCE16;
 437                 vgl->tex_type     = GL_UNSIGNED_SHORT;
 438                 yuv_range_correction = (float)((1 << 16) - 1) / ((1 << dsc->pixel_bits) - 1);
 439                 break;
 440 #endif
 441             }
 442             list++;
 443         }
 444     }
 445
 446     vgl->chroma = vlc_fourcc_GetChromaDescription(vgl->fmt.i_chroma);
 447     vgl->use_multitexture = vgl->chroma->plane_count > 1;
 448
 449     /* Texture size */
 450     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 451         int w = vgl->fmt.i_width  * vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den;
 452         int h = vgl->fmt.i_height * vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den;
 453         if (vgl->supports_npot) {
 454             vgl->tex_width[j]  = w;
 455             vgl->tex_height[j] = h;
 456         } else {
 457             vgl->tex_width[j]  = GetAlignedSize(w);
 458             vgl->tex_height[j] = GetAlignedSize(h);
 459         }
 460     }
 461
 462     /* Build program if needed */
 463     vgl->program[0] =
 464     vgl->program[1] = 0;
 465     vgl->shader[0] =
 466     vgl->shader[1] =
 467     vgl->shader[2] = -1;
 468     vgl->local_count = 0;
 469     if (supports_shaders) {
 470         if (need_fs_yuv)
 471             BuildYUVFragmentShader(vgl, &vgl->shader[0],
 472                                    &vgl->local_count,
 473                                    vgl->local_value,
 474                                    fmt, yuv_range_correction);
 475         else
 476             BuildRGBFragmentShader(vgl, &vgl->shader[0]);
 477         BuildRGBAFragmentShader(vgl, &vgl->shader[1]);
 478         BuildVertexShader(vgl, &vgl->shader[2]);
 479
 480         /* Check shaders messages */
 481         for (unsigned j = 0; j < 3; j++) {
 482             int infoLength;
 483             vgl->GetShaderiv(vgl->shader[j], GL_INFO_LOG_LENGTH, &infoLength);
 484             if (infoLength <= 1)
 485                 continue;
 486
 487             char *infolog = malloc(infoLength);
 488             int charsWritten;
 489             vgl->GetShaderInfoLog(vgl->shader[j], infoLength, &charsWritten, infolog);
 490             fprintf(stderr, "shader %d: %s\n", j, infolog);
 491             free(infolog);
 492         }
 493
 494         vgl->program[0] = vgl->CreateProgram();
 495         vgl->AttachShader(vgl->program[0], vgl->shader[0]);
 496         vgl->AttachShader(vgl->program[0], vgl->shader[2]);
 497         vgl->LinkProgram(vgl->program[0]);
 498
 499         vgl->program[1] = vgl->CreateProgram();
 500         vgl->AttachShader(vgl->program[1], vgl->shader[1]);
 501         vgl->AttachShader(vgl->program[1], vgl->shader[2]);
 502         vgl->LinkProgram(vgl->program[1]);
 503
 504         /* Check program messages */
 505         for (GLuint i = 0; i < 2; i++) {
 506             int infoLength = 0;
 507             vgl->GetProgramiv(vgl->program[i], GL_INFO_LOG_LENGTH, &infoLength);
 508             if (infoLength <= 1)
 509                 continue;
 510             char *infolog = malloc(infoLength);
 511             int charsWritten;
 512             vgl->GetProgramInfoLog(vgl->program[i], infoLength, &charsWritten, infolog);
 513             fprintf(stderr, "shader program %d: %s\n", i, infolog);
 514             free(infolog);
 515
 516             /* If there is some message, better to check linking is ok */
 517             GLint link_status = GL_TRUE;
 518             vgl->GetProgramiv(vgl->program[i], GL_LINK_STATUS, &link_status);
 519             if (link_status == GL_FALSE) {
 520                 fprintf(stderr, "Unable to use program %d\n", i);
 521                 free(vgl);
 522                 return NULL;
 523             }
 524         }
 525     }
 526
 527     /* */
 528     glDisable(GL_BLEND);
 529     glDisable(GL_DEPTH_TEST);
 530     glDepthMask(GL_FALSE);
 531     glDisable(GL_CULL_FACE);
 532     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 533     glClear(GL_COLOR_BUFFER_BIT);
 534
 535     vlc_gl_Unlock(vgl->gl);
 536
 537     /* */
 538     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 539         for (int j = 0; j < PICTURE_PLANE_MAX; j++)
 540             vgl->texture[i][j] = 0;
 541     }
 542     vgl->region_count = 0;
 543     vgl->region = NULL;
 544     vgl->pool = NULL;
 545
 546     *fmt = vgl->fmt;
 547     if (subpicture_chromas) {
 548         *subpicture_chromas = gl_subpicture_chromas;
 549     }
 550     return vgl;
 551 }
 552
 553 void vout_display_opengl_Delete(vout_display_opengl_t *vgl)
 554 {
 555     /* */
 556     if (!vlc_gl_Lock(vgl->gl)) {
 557         glFinish();
 558         glFlush();
 559         for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++)
 560             glDeleteTextures(vgl->chroma->plane_count, vgl->texture[i]);
 561         for (int i = 0; i < vgl->region_count; i++) {
 562             if (vgl->region[i].texture)
 563                 glDeleteTextures(1, &vgl->region[i].texture);
 564         }
 565         free(vgl->region);
 566
 567         if (vgl->program[0]) {
 568             for (int i = 0; i < 2; i++)
 569                 vgl->DeleteProgram(vgl->program[i]);
 570             for (int i = 0; i < 3; i++)
 571                 vgl->DeleteShader(vgl->shader[i]);
 572         }
 573
 574         vlc_gl_Unlock(vgl->gl);
 575     }
 576     if (vgl->pool)
 577         picture_pool_Delete(vgl->pool);
 578     free(vgl);
 579 }
 580
 581 picture_pool_t *vout_display_opengl_GetPool(vout_display_opengl_t *vgl, unsigned requested_count)
 582 {
 583     if (vgl->pool)
 584         return vgl->pool;
 585
 586     /* Allocate our pictures */
 587     picture_t *picture[VLCGL_PICTURE_MAX] = {NULL, };
 588     unsigned count;
 589
 590     for (count = 0; count < __MIN(VLCGL_PICTURE_MAX, requested_count); count++) {
 591         picture[count] = picture_NewFromFormat(&vgl->fmt);
 592         if (!picture[count])
 593             break;
 594     }
 595     if (count <= 0)
 596         return NULL;
 597
 598     /* Wrap the pictures into a pool */
 599     picture_pool_configuration_t cfg;
 600     memset(&cfg, 0, sizeof(cfg));
 601     cfg.picture_count = count;
 602     cfg.picture       = picture;
 603     vgl->pool = picture_pool_NewExtended(&cfg);
 604     if (!vgl->pool)
 605         goto error;
 606
 607     /* Allocates our textures */
 608     if (vlc_gl_Lock(vgl->gl))
 609         return vgl->pool;
 610
 611     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 612         glGenTextures(vgl->chroma->plane_count, vgl->texture[i]);
 613         for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 614             if (vgl->use_multitexture) {
 615                 glActiveTexture(GL_TEXTURE0 + j);
 616                 glClientActiveTexture(GL_TEXTURE0 + j);
 617             }
 618             glBindTexture(vgl->tex_target, vgl->texture[i][j]);
 619
 620 #if !USE_OPENGL_ES
 621             /* Set the texture parameters */
 622             glTexParameterf(vgl->tex_target, GL_TEXTURE_PRIORITY, 1.0);
 623             glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 624 #endif
 625
 626             glTexParameteri(vgl->tex_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 627             glTexParameteri(vgl->tex_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 628             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 629             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 630
 631             /* Call glTexImage2D only once, and use glTexSubImage2D later */
 632             glTexImage2D(vgl->tex_target, 0,
 633                          vgl->tex_internal, vgl->tex_width[j], vgl->tex_height[j],
 634                          0, vgl->tex_format, vgl->tex_type, NULL);
 635         }
 636     }
 637
 638     vlc_gl_Unlock(vgl->gl);
 639
 640     return vgl->pool;
 641
 642 error:
 643     for (unsigned i = 0; i < count; i++)
 644         picture_Release(picture[i]);
 645     return NULL;
 646 }
 647
 648 int vout_display_opengl_Prepare(vout_display_opengl_t *vgl,
 649                                 picture_t *picture, subpicture_t *subpicture)
 650 {
 651     if (vlc_gl_Lock(vgl->gl))
 652         return VLC_EGENERIC;
 653
 654     /* Update the texture */
 655     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 656         if (vgl->use_multitexture) {
 657             glActiveTexture(GL_TEXTURE0 + j);
 658             glClientActiveTexture(GL_TEXTURE0 + j);
 659         }
 660         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 661         glPixelStorei(GL_UNPACK_ROW_LENGTH, picture->p[j].i_pitch / picture->p[j].i_pixel_pitch);
 662         glTexSubImage2D(vgl->tex_target, 0,
 663                         0, 0,
 664                         vgl->fmt.i_width  * vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den,
 665                         vgl->fmt.i_height * vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den,
 666                         vgl->tex_format, vgl->tex_type, picture->p[j].p_pixels);
 667     }
 668
 669     int         last_count = vgl->region_count;
 670     gl_region_t *last = vgl->region;
 671
 672     vgl->region_count = 0;
 673     vgl->region       = NULL;
 674
 675     if (subpicture) {
 676
 677         int count = 0;
 678         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next)
 679             count++;
 680
 681         vgl->region_count = count;
 682         vgl->region       = calloc(count, sizeof(*vgl->region));
 683
 684         if (vgl->use_multitexture) {
 685             glActiveTexture(GL_TEXTURE0 + 0);
 686             glClientActiveTexture(GL_TEXTURE0 + 0);
 687         }
 688         int i = 0;
 689         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next, i++) {
 690             gl_region_t *glr = &vgl->region[i];
 691
 692             glr->format = GL_RGBA;
 693             glr->type   = GL_UNSIGNED_BYTE;
 694             glr->width  = r->fmt.i_visible_width;
 695             glr->height = r->fmt.i_visible_height;
 696             if (!vgl->supports_npot) {
 697                 glr->width  = GetAlignedSize(glr->width);
 698                 glr->height = GetAlignedSize(glr->height);
 699             }
 700             glr->alpha  = (float)subpicture->i_alpha * r->i_alpha / 255 / 255;
 701             glr->left   =  2.0 * (r->i_x                          ) / subpicture->i_original_picture_width  - 1.0;
 702             glr->top    = -2.0 * (r->i_y                          ) / subpicture->i_original_picture_height + 1.0;
 703             glr->right  =  2.0 * (r->i_x + r->fmt.i_visible_width ) / subpicture->i_original_picture_width  - 1.0;
 704             glr->bottom = -2.0 * (r->i_y + r->fmt.i_visible_height) / subpicture->i_original_picture_height + 1.0;
 705
 706             glr->texture = 0;
 707             for (int j = 0; j < last_count; j++) {
 708                 if (last[j].texture &&
 709                     last[j].width  == glr->width &&
 710                     last[j].height == glr->height &&
 711                     last[j].format == glr->format &&
 712                     last[j].type   == glr->type) {
 713                     glr->texture = last[j].texture;
 714                     memset(&last[j], 0, sizeof(last[j]));
 715                     break;
 716                 }
 717             }
 718
 719             const int pixels_offset = r->fmt.i_y_offset * r->p_picture->p->i_pitch +
 720                                       r->fmt.i_x_offset * r->p_picture->p->i_pixel_pitch;
 721             if (glr->texture) {
 722                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 723                 /* TODO set GL_UNPACK_ALIGNMENT */
 724                 glPixelStorei(GL_UNPACK_ROW_LENGTH, r->p_picture->p->i_pitch / r->p_picture->p->i_pixel_pitch);
 725                 glTexSubImage2D(GL_TEXTURE_2D, 0,
 726                                 0, 0, glr->width, glr->height,
 727                                 glr->format, glr->type, &r->p_picture->p->p_pixels[pixels_offset]);
 728             } else {
 729                 glGenTextures(1, &glr->texture);
 730                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 731 #if !USE_OPENGL_ES
 732                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 1.0);
 733                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 734 #endif
 735                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 736                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 737                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 738                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 739                 /* TODO set GL_UNPACK_ALIGNMENT */
 740                 glPixelStorei(GL_UNPACK_ROW_LENGTH, r->p_picture->p->i_pitch / r->p_picture->p->i_pixel_pitch);
 741                 glTexImage2D(GL_TEXTURE_2D, 0, glr->format,
 742                              glr->width, glr->height, 0, glr->format, glr->type,
 743                              &r->p_picture->p->p_pixels[pixels_offset]);
 744             }
 745         }
 746     }
 747     for (int i = 0; i < last_count; i++) {
 748         if (last[i].texture)
 749             glDeleteTextures(1, &last[i].texture);
 750     }
 751     free(last);
 752
 753     vlc_gl_Unlock(vgl->gl);
 754     VLC_UNUSED(subpicture);
 755     return VLC_SUCCESS;
 756 }
 757
 758 static void DrawWithoutShaders(vout_display_opengl_t *vgl,
 759                                float *left, float *top, float *right, float *bottom)
 760 {
 761     static const GLfloat vertexCoord[] = {
 762         -1.0f, -1.0f,
 763          1.0f, -1.0f,
 764         -1.0f,  1.0f,
 765          1.0f,  1.0f,
 766     };
 767
 768     const GLfloat textureCoord[] = {
 769         left[0],  bottom[0],
 770         right[0], bottom[0],
 771         left[0],  top[0],
 772         right[0], top[0]
 773     };
 774
 775     glEnable(vgl->tex_target);
 776     glActiveTexture(GL_TEXTURE0 + 0);
 777     glClientActiveTexture(GL_TEXTURE0 + 0);
 778
 779     glBindTexture(vgl->tex_target, vgl->texture[0][0]);
 780
 781     glEnableClientState(GL_VERTEX_ARRAY);
 782     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 783
 784     glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
 785     glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
 786
 787     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 788
 789     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 790     glDisableClientState(GL_VERTEX_ARRAY);
 791     glDisable(vgl->tex_target);
 792 }
 793
 794 static void DrawWithShaders(vout_display_opengl_t *vgl,
 795                             float *left, float *top, float *right, float *bottom)
 796 {
 797     vgl->UseProgram(vgl->program[0]);
 798     vgl->Uniform4fv(vgl->GetUniformLocation(vgl->program[0], "Coefficient"), 4, vgl->local_value);
 799     vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture0"), 0);
 800     vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture1"), 1);
 801     vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture2"), 2);
 802
 803     static const GLfloat vertexCoord[] = {
 804         -1.0,  1.0,
 805         -1.0, -1.0,
 806          1.0,  1.0,
 807          1.0, -1.0,
 808     };
 809
 810     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 811         const GLfloat textureCoord[] = {
 812             left[j],  top[j],
 813             left[j],  bottom[j],
 814             right[j], top[j],
 815             right[j], bottom[j],
 816         };
 817         glActiveTexture(GL_TEXTURE0+j);
 818         glClientActiveTexture(GL_TEXTURE0+j);
 819         glEnable(vgl->tex_target);
 820         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 821
 822         char attribute[20];
 823         snprintf(attribute, sizeof(attribute), "MultiTexCoord%1d", j);
 824         vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[0], attribute));
 825         vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[0], attribute), 2, GL_FLOAT, 0, 0, textureCoord);
 826     }
 827     glActiveTexture(GL_TEXTURE0 + 0);
 828     glClientActiveTexture(GL_TEXTURE0 + 0);
 829     vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[0], "VertexPosition"));
 830     vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[0], "VertexPosition"), 2, GL_FLOAT, 0, 0, vertexCoord);
 831
 832     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 833 }
 834
 835 int vout_display_opengl_Display(vout_display_opengl_t *vgl,
 836                                 const video_format_t *source)
 837 {
 838     if (vlc_gl_Lock(vgl->gl))
 839         return VLC_EGENERIC;
 840
 841     /* Why drawing here and not in Render()? Because this way, the
 842        OpenGL providers can call vout_display_opengl_Display to force redraw.i
 843        Currently, the OS X provider uses it to get a smooth window resizing */
 844     glClear(GL_COLOR_BUFFER_BIT);
 845
 846     /* Draw the picture */
 847     float left[PICTURE_PLANE_MAX];
 848     float top[PICTURE_PLANE_MAX];
 849     float right[PICTURE_PLANE_MAX];
 850     float bottom[PICTURE_PLANE_MAX];
 851     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 852         /* glTexCoord works differently with GL_TEXTURE_2D and
 853            GL_TEXTURE_RECTANGLE_EXT */
 854         float scale_w, scale_h;
 855
 856         if (vgl->tex_target == GL_TEXTURE_2D) {
 857             scale_w = (float)vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den / vgl->tex_width[j];
 858             scale_h = (float)vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den / vgl->tex_height[j];
 859
 860         } else {
 861             scale_w = 1.0;
 862             scale_h = 1.0;
 863         }
 864         left[j]   = (source->i_x_offset +                       0 ) * scale_w;
 865         top[j]    = (source->i_y_offset +                       0 ) * scale_h;
 866         right[j]  = (source->i_x_offset + source->i_visible_width ) * scale_w;
 867         bottom[j] = (source->i_y_offset + source->i_visible_height) * scale_h;
 868     }
 869
 870     if (vgl->program[0])
 871         DrawWithShaders(vgl, left, top ,right, bottom);
 872     else
 873         DrawWithoutShaders(vgl, left, top, right, bottom);
 874
 875     /* Draw the subpictures */
 876     if (vgl->program[1]) {
 877         // Change the program for overlays
 878         vgl->UseProgram(vgl->program[1]);
 879         vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[1], "Texture"), 0);
 880     }
 881
 882     glEnable(GL_TEXTURE_2D);
 883     glEnable(GL_BLEND);
 884     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 885
 886     glActiveTexture(GL_TEXTURE0 + 0);
 887     glClientActiveTexture(GL_TEXTURE0 + 0);
 888     for (int i = 0; i < vgl->region_count; i++) {
 889         gl_region_t *glr = &vgl->region[i];
 890         const GLfloat vertexCoord[] = {
 891             glr->left,  glr->top,
 892             glr->left,  glr->bottom,
 893             glr->right, glr->top,
 894             glr->right, glr->bottom,
 895         };
 896         static const GLfloat textureCoord[] = {
 897             0.0, 0.0,
 898             0.0, 1.0,
 899             1.0, 0.0,
 900             1.0, 1.0,
 901         };
 902
 903         glBindTexture(GL_TEXTURE_2D, glr->texture);
 904         if (vgl->program[1]) {
 905             vgl->Uniform4f(vgl->GetUniformLocation(vgl->program[1], "FillColor"), 1.0f, 1.0f, 1.0f, glr->alpha);
 906             vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[1], "MultiTexCoord0"));
 907             vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[1], "MultiTexCoord0"), 2, GL_FLOAT, 0, 0, textureCoord);
 908             vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[1], "VertexPosition"));
 909             vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[1], "VertexPosition"), 2, GL_FLOAT, 0, 0, vertexCoord);
 910         } else {
 911             glEnableClientState(GL_VERTEX_ARRAY);
 912             glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 913             glColor4f(1.0f, 1.0f, 1.0f, glr->alpha);
 914             glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
 915             glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
 916         }
 917
 918         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 919
 920         if (!vgl->program[1]) {
 921             glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 922             glDisableClientState(GL_VERTEX_ARRAY);
 923         }
 924     }
 925     glDisable(GL_BLEND);
 926     glDisable(GL_TEXTURE_2D);
 927
 928     /* Display */
 929     vlc_gl_Swap(vgl->gl);
 930
 931     vlc_gl_Unlock(vgl->gl);
 932     return VLC_SUCCESS;
 933 }
 934