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 <assert.h>
  33
  34 #include <vlc_common.h>
  35 #include <vlc_picture_pool.h>
  36 #include <vlc_subpicture.h>
  37 #include <vlc_opengl.h>
  38 #include <vlc_memory.h>
  39
  40 #include "opengl.h"
  41
  42 #ifndef GL_CLAMP_TO_EDGE
  43 # define GL_CLAMP_TO_EDGE 0x812F
  44 #endif
  45
  46 #if USE_OPENGL_ES == 2 || defined(__APPLE__)
  47 #   define PFNGLGETPROGRAMIVPROC             typeof(glGetProgramiv)*
  48 #   define PFNGLGETPROGRAMINFOLOGPROC        typeof(glGetProgramInfoLog)*
  49 #   define PFNGLGETSHADERIVPROC              typeof(glGetShaderiv)*
  50 #   define PFNGLGETSHADERINFOLOGPROC         typeof(glGetShaderInfoLog)*
  51 #   define PFNGLGETUNIFORMLOCATIONPROC       typeof(glGetUniformLocation)*
  52 #   define PFNGLGETATTRIBLOCATIONPROC        typeof(glGetAttribLocation)*
  53 #   define PFNGLVERTEXATTRIBPOINTERPROC      typeof(glVertexAttribPointer)*
  54 #   define PFNGLENABLEVERTEXATTRIBARRAYPROC  typeof(glEnableVertexAttribArray)*
  55 #   define PFNGLUNIFORMMATRIX4FVPROC         typeof(glUniformMatrix4fv)*
  56 #   define PFNGLUNIFORM4FVPROC               typeof(glUniform4fv)*
  57 #   define PFNGLUNIFORM4FPROC                typeof(glUniform4f)*
  58 #   define PFNGLUNIFORM1IPROC                typeof(glUniform1i)*
  59 #   define PFNGLCREATESHADERPROC             typeof(glCreateShader)*
  60 #   define PFNGLSHADERSOURCEPROC             typeof(glShaderSource)*
  61 #   define PFNGLCOMPILESHADERPROC            typeof(glCompileShader)*
  62 #   define PFNGLDELETESHADERPROC             typeof(glDeleteShader)*
  63 #   define PFNGLCREATEPROGRAMPROC            typeof(glCreateProgram)*
  64 #   define PFNGLLINKPROGRAMPROC              typeof(glLinkProgram)*
  65 #   define PFNGLUSEPROGRAMPROC               typeof(glUseProgram)*
  66 #   define PFNGLDELETEPROGRAMPROC            typeof(glDeleteProgram)*
  67 #   define PFNGLATTACHSHADERPROC             typeof(glAttachShader)*
  68 #   define PFNGLGENBUFFERSPROC               typeof(glGenBuffers)*
  69 #   define PFNGLBINDBUFFERPROC               typeof(glBindBuffer)*
  70 #   define PFNGLBUFFERDATAPROC               typeof(glBufferData)*
  71 #   define PFNGLDELETEBUFFERSPROC            typeof(glDeleteBuffers)*
  72 #if defined(__APPLE__) && USE_OPENGL_ES
  73 #   import <CoreFoundation/CoreFoundation.h>
  74 #endif
  75 #endif
  76
  77 #if USE_OPENGL_ES
  78 #   define GLSL_VERSION "100"
  79 #   define VLCGL_TEXTURE_COUNT 1
  80 #   define VLCGL_PICTURE_MAX 1
  81 #   define PRECISION "precision highp float;"
  82 #if USE_OPENGL_ES == 2
  83 #   define SUPPORTS_SHADERS
  84 #   define glClientActiveTexture(x)
  85 #else
  86 #   define SUPPORTS_FIXED_PIPELINE
  87 #   define GL_MAX_TEXTURE_IMAGE_UNITS GL_MAX_TEXTURE_UNITS
  88 #endif
  89 #else
  90 #   define GLSL_VERSION "120"
  91 #   define VLCGL_TEXTURE_COUNT 1
  92 #   define VLCGL_PICTURE_MAX 128
  93 #   define PRECISION ""
  94 #   define SUPPORTS_SHADERS
  95 #   define SUPPORTS_FIXED_PIPELINE
  96 #endif
  97
  98 static const vlc_fourcc_t gl_subpicture_chromas[] = {
  99     VLC_CODEC_RGBA,
 100     0
 101 };
 102
 103 typedef struct {
 104     GLuint   texture;
 105     unsigned format;
 106     unsigned type;
 107     unsigned width;
 108     unsigned height;
 109
 110     float    alpha;
 111
 112     float    top;
 113     float    left;
 114     float    bottom;
 115     float    right;
 116
 117     float    tex_width;
 118     float    tex_height;
 119 } gl_region_t;
 120
 121 struct vout_display_opengl_t {
 122
 123     vlc_gl_t   *gl;
 124
 125     video_format_t fmt;
 126     const vlc_chroma_description_t *chroma;
 127
 128     int        tex_target;
 129     int        tex_format;
 130     int        tex_internal;
 131     int        tex_type;
 132
 133     int        tex_width[PICTURE_PLANE_MAX];
 134     int        tex_height[PICTURE_PLANE_MAX];
 135
 136     GLuint     texture[VLCGL_TEXTURE_COUNT][PICTURE_PLANE_MAX];
 137
 138     int         region_count;
 139     gl_region_t *region;
 140
 141
 142     picture_pool_t *pool;
 143
 144     /* index 0 for normal and 1 for subtitle overlay */
 145     GLuint     program[2];
 146     GLint      shader[3]; //3. is for the common vertex shader
 147     int        local_count;
 148     GLfloat    local_value[16];
 149
 150     GLuint vertex_buffer_object;
 151     GLuint texture_buffer_object[PICTURE_PLANE_MAX];
 152
 153     GLuint *subpicture_buffer_object;
 154     int    subpicture_buffer_object_count;
 155
 156     /* Shader variables commands*/
 157 #ifdef SUPPORTS_SHADERS
 158     PFNGLGETUNIFORMLOCATIONPROC      GetUniformLocation;
 159     PFNGLGETATTRIBLOCATIONPROC       GetAttribLocation;
 160     PFNGLVERTEXATTRIBPOINTERPROC     VertexAttribPointer;
 161     PFNGLENABLEVERTEXATTRIBARRAYPROC EnableVertexAttribArray;
 162
 163     PFNGLUNIFORMMATRIX4FVPROC   UniformMatrix4fv;
 164     PFNGLUNIFORM4FVPROC         Uniform4fv;
 165     PFNGLUNIFORM4FPROC          Uniform4f;
 166     PFNGLUNIFORM1IPROC          Uniform1i;
 167
 168     /* Shader command */
 169     PFNGLCREATESHADERPROC CreateShader;
 170     PFNGLSHADERSOURCEPROC ShaderSource;
 171     PFNGLCOMPILESHADERPROC CompileShader;
 172     PFNGLDELETESHADERPROC   DeleteShader;
 173
 174     PFNGLCREATEPROGRAMPROC CreateProgram;
 175     PFNGLLINKPROGRAMPROC   LinkProgram;
 176     PFNGLUSEPROGRAMPROC    UseProgram;
 177     PFNGLDELETEPROGRAMPROC DeleteProgram;
 178
 179     PFNGLATTACHSHADERPROC  AttachShader;
 180
 181     /* Shader log commands */
 182     PFNGLGETPROGRAMIVPROC  GetProgramiv;
 183     PFNGLGETPROGRAMINFOLOGPROC GetProgramInfoLog;
 184     PFNGLGETSHADERIVPROC   GetShaderiv;
 185     PFNGLGETSHADERINFOLOGPROC GetShaderInfoLog;
 186
 187     PFNGLGENBUFFERSPROC    GenBuffers;
 188     PFNGLBINDBUFFERPROC    BindBuffer;
 189     PFNGLBUFFERDATAPROC    BufferData;
 190     PFNGLDELETEBUFFERSPROC DeleteBuffers;
 191 #endif
 192
 193 #if defined(_WIN32)
 194     PFNGLACTIVETEXTUREPROC  ActiveTexture;
 195     PFNGLCLIENTACTIVETEXTUREPROC  ClientActiveTexture;
 196 #endif
 197
 198
 199     /* multitexture */
 200     bool use_multitexture;
 201
 202     /* Non-power-of-2 texture size support */
 203     bool supports_npot;
 204
 205     uint8_t *texture_temp_buf;
 206     int      texture_temp_buf_size;
 207 };
 208
 209 static inline int GetAlignedSize(unsigned size)
 210 {
 211     /* Return the smallest larger or equal power of 2 */
 212     unsigned align = 1 << (8 * sizeof (unsigned) - clz(size));
 213     return ((align >> 1) == size) ? size : align;
 214 }
 215
 216 #if !USE_OPENGL_ES
 217 static bool IsLuminance16Supported(int target)
 218 {
 219     GLuint texture;
 220
 221     glGenTextures(1, &texture);
 222     glBindTexture(target, texture);
 223     glTexImage2D(target, 0, GL_LUMINANCE16,
 224                  64, 64, 0, GL_LUMINANCE, GL_UNSIGNED_SHORT, NULL);
 225     GLint size = 0;
 226     glGetTexLevelParameteriv(target, 0, GL_TEXTURE_LUMINANCE_SIZE, &size);
 227
 228     glDeleteTextures(1, &texture);
 229
 230     return size == 16;
 231 }
 232 #endif
 233
 234 #ifdef SUPPORTS_SHADERS
 235 static void BuildVertexShader(vout_display_opengl_t *vgl,
 236                               GLint *shader)
 237 {
 238     /* Basic vertex shader */
 239     const char *vertexShader =
 240         "#version " GLSL_VERSION "\n"
 241         PRECISION
 242         "varying vec4 TexCoord0,TexCoord1, TexCoord2;"
 243         "attribute vec4 MultiTexCoord0,MultiTexCoord1,MultiTexCoord2;"
 244         "attribute vec2 VertexPosition;"
 245         "uniform mat4 RotationMatrix;"
 246         "void main() {"
 247         " TexCoord0 = MultiTexCoord0;"
 248         " TexCoord1 = MultiTexCoord1;"
 249         " TexCoord2 = MultiTexCoord2;"
 250         " gl_Position = RotationMatrix * vec4(VertexPosition, 0.0, 1.0);"
 251         "}";
 252
 253     *shader = vgl->CreateShader(GL_VERTEX_SHADER);
 254     vgl->ShaderSource(*shader, 1, &vertexShader, NULL);
 255     vgl->CompileShader(*shader);
 256 }
 257
 258 static void BuildYUVFragmentShader(vout_display_opengl_t *vgl,
 259                                    GLint *shader,
 260                                    int *local_count,
 261                                    GLfloat *local_value,
 262                                    const video_format_t *fmt,
 263                                    float yuv_range_correction)
 264
 265 {
 266     /* [R/G/B][Y U V O] from TV range to full range
 267      * XXX we could also do hue/brightness/constrast/gamma
 268      * by simply changing the coefficients
 269      */
 270     const float matrix_bt601_tv2full[12] = {
 271         1.164383561643836,  0.0000,             1.596026785714286, -0.874202217873451 ,
 272         1.164383561643836, -0.391762290094914, -0.812967647237771,  0.531667823499146 ,
 273         1.164383561643836,  2.017232142857142,  0.0000,            -1.085630789302022 ,
 274     };
 275     const float matrix_bt709_tv2full[12] = {
 276         1.164383561643836,  0.0000,             1.792741071428571, -0.972945075016308 ,
 277         1.164383561643836, -0.21324861427373,  -0.532909328559444,  0.301482665475862 ,
 278         1.164383561643836,  2.112401785714286,  0.0000,            -1.133402217873451 ,
 279     };
 280     const float (*matrix) = fmt->i_height > 576 ? matrix_bt709_tv2full
 281                                                 : matrix_bt601_tv2full;
 282
 283     /* Basic linear YUV -> RGB conversion using bilinear interpolation */
 284     const char *template_glsl_yuv =
 285         "#version " GLSL_VERSION "\n"
 286         PRECISION
 287         "uniform sampler2D Texture0;"
 288         "uniform sampler2D Texture1;"
 289         "uniform sampler2D Texture2;"
 290         "uniform vec4      Coefficient[4];"
 291         "varying vec4      TexCoord0,TexCoord1,TexCoord2;"
 292
 293         "void main(void) {"
 294         " vec4 x,y,z,result;"
 295         " x  = texture2D(Texture0, TexCoord0.st);"
 296         " %c = texture2D(Texture1, TexCoord1.st);"
 297         " %c = texture2D(Texture2, TexCoord2.st);"
 298
 299         " result = x * Coefficient[0] + Coefficient[3];"
 300         " result = (y * Coefficient[1]) + result;"
 301         " result = (z * Coefficient[2]) + result;"
 302         " gl_FragColor = result;"
 303         "}";
 304     bool swap_uv = fmt->i_chroma == VLC_CODEC_YV12 ||
 305                    fmt->i_chroma == VLC_CODEC_YV9;
 306
 307     char *code;
 308     if (asprintf(&code, template_glsl_yuv,
 309                  swap_uv ? 'z' : 'y',
 310                  swap_uv ? 'y' : 'z') < 0)
 311         code = NULL;
 312
 313     for (int i = 0; i < 4; i++) {
 314         float correction = i < 3 ? yuv_range_correction : 1.f;
 315         /* We place coefficient values for coefficient[4] in one array from matrix values.
 316            Notice that we fill values from top down instead of left to right.*/
 317         for (int j = 0; j < 4; j++)
 318             local_value[*local_count + i*4+j] = j < 3 ? correction * matrix[j*4+i]
 319                                                       : 0.f;
 320     }
 321     (*local_count) += 4;
 322
 323
 324     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 325     vgl->ShaderSource(*shader, 1, (const char **)&code, NULL);
 326     vgl->CompileShader(*shader);
 327
 328     free(code);
 329 }
 330
 331 #if 0
 332 static void BuildRGBFragmentShader(vout_display_opengl_t *vgl,
 333                                    GLint *shader)
 334 {
 335     // Simple shader for RGB
 336     const char *code =
 337         "#version " GLSL_VERSION "\n"
 338         PRECISION
 339         "uniform sampler2D Texture[3];"
 340         "varying vec4 TexCoord0,TexCoord1,TexCoord2;"
 341         "void main()"
 342         "{ "
 343         "  gl_FragColor = texture2D(Texture[0], TexCoord0.st);"
 344         "}";
 345     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 346     vgl->ShaderSource(*shader, 1, &code, NULL);
 347     vgl->CompileShader(*shader);
 348 }
 349 #endif
 350
 351 static void BuildRGBAFragmentShader(vout_display_opengl_t *vgl,
 352                                    GLint *shader)
 353 {
 354     // Simple shader for RGBA
 355     const char *code =
 356         "#version " GLSL_VERSION "\n"
 357         PRECISION
 358         "uniform sampler2D Texture;"
 359         "uniform vec4 FillColor;"
 360         "varying vec4 TexCoord0;"
 361         "void main()"
 362         "{ "
 363         "  gl_FragColor = texture2D(Texture, TexCoord0.st) * FillColor;"
 364         "}";
 365     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 366     vgl->ShaderSource(*shader, 1, &code, NULL);
 367     vgl->CompileShader(*shader);
 368 }
 369
 370 static void BuildXYZFragmentShader(vout_display_opengl_t *vgl,
 371                                    GLint *shader)
 372 {
 373     /* Shader for XYZ to RGB correction
 374      * 3 steps :
 375      *  - XYZ gamma correction
 376      *  - XYZ to RGB matrix conversion
 377      *  - reverse RGB gamma correction
 378      */
 379       const char *code =
 380         "#version " GLSL_VERSION "\n"
 381         PRECISION
 382         "uniform sampler2D Texture0;"
 383         "uniform vec4 xyz_gamma = vec4(2.6);"
 384         "uniform vec4 rgb_gamma = vec4(1.0/2.2);"
 385         // WARN: matrix Is filled column by column (not row !)
 386         "uniform mat4 matrix_xyz_rgb = mat4("
 387         "    3.240454 , -0.9692660, 0.0556434, 0.0,"
 388         "   -1.5371385,  1.8760108, -0.2040259, 0.0,"
 389         "    -0.4985314, 0.0415560, 1.0572252,  0.0,"
 390         "    0.0,      0.0,         0.0,        1.0 "
 391         " );"
 392
 393         "varying vec4 TexCoord0;"
 394         "void main()"
 395         "{ "
 396         " vec4 v_in, v_out;"
 397         " v_in  = texture2D(Texture0, TexCoord0.st);"
 398         " v_in = pow(v_in, xyz_gamma);"
 399         " v_out = matrix_xyz_rgb * v_in ;"
 400         " v_out = pow(v_out, rgb_gamma) ;"
 401         " v_out = clamp(v_out, 0.0, 1.0) ;"
 402         " gl_FragColor = v_out;"
 403         "}";
 404     *shader = vgl->CreateShader(GL_FRAGMENT_SHADER);
 405     vgl->ShaderSource(*shader, 1, &code, NULL);
 406     vgl->CompileShader(*shader);
 407 }
 408
 409 #endif
 410
 411 vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
 412                                                const vlc_fourcc_t **subpicture_chromas,
 413                                                vlc_gl_t *gl)
 414 {
 415     vout_display_opengl_t *vgl = calloc(1, sizeof(*vgl));
 416     if (!vgl)
 417         return NULL;
 418
 419     vgl->gl = gl;
 420     if (vlc_gl_Lock(vgl->gl)) {
 421         free(vgl);
 422         return NULL;
 423     }
 424
 425     if (vgl->gl->getProcAddress == NULL) {
 426         fprintf(stderr, "getProcAddress not implemented, bailing out\n");
 427         free(vgl);
 428         return NULL;
 429     }
 430
 431     const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
 432 #if !USE_OPENGL_ES
 433     const unsigned char *ogl_version = glGetString(GL_VERSION);
 434     bool supports_shaders = strverscmp((const char *)ogl_version, "2.0") >= 0;
 435 #else
 436     bool supports_shaders = false;
 437 #endif
 438
 439 #if USE_OPENGL_ES == 2
 440     vgl->CreateShader  = glCreateShader;
 441     vgl->ShaderSource  = glShaderSource;
 442     vgl->CompileShader = glCompileShader;
 443     vgl->AttachShader  = glAttachShader;
 444
 445     vgl->GetProgramiv  = glGetProgramiv;
 446     vgl->GetShaderiv   = glGetShaderiv;
 447     vgl->GetProgramInfoLog  = glGetProgramInfoLog;
 448     vgl->GetShaderInfoLog   = glGetShaderInfoLog;
 449
 450     vgl->DeleteShader  = glDeleteShader;
 451
 452     vgl->GetUniformLocation = glGetUniformLocation;
 453     vgl->GetAttribLocation  = glGetAttribLocation;
 454     vgl->VertexAttribPointer= glVertexAttribPointer;
 455     vgl->EnableVertexAttribArray = glEnableVertexAttribArray;
 456     vgl->UniformMatrix4fv = glUniformMatrix4fv;
 457     vgl->Uniform4fv    = glUniform4fv;
 458     vgl->Uniform4f     = glUniform4f;
 459     vgl->Uniform1i     = glUniform1i;
 460
 461     vgl->CreateProgram = glCreateProgram;
 462     vgl->LinkProgram   = glLinkProgram;
 463     vgl->UseProgram    = glUseProgram;
 464     vgl->DeleteProgram = glDeleteProgram;
 465
 466     vgl->GenBuffers    = glGenBuffers;
 467     vgl->BindBuffer    = glBindBuffer;
 468     vgl->BufferData    = glBufferData;
 469     vgl->DeleteBuffers = glDeleteBuffers;
 470
 471     supports_shaders = true;
 472 #elif defined(SUPPORTS_SHADERS)
 473     vgl->CreateShader  = (PFNGLCREATESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glCreateShader");
 474     vgl->ShaderSource  = (PFNGLSHADERSOURCEPROC)vlc_gl_GetProcAddress(vgl->gl, "glShaderSource");
 475     vgl->CompileShader = (PFNGLCOMPILESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glCompileShader");
 476     vgl->AttachShader  = (PFNGLATTACHSHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glAttachShader");
 477
 478     vgl->GetProgramiv  = (PFNGLGETPROGRAMIVPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetProgramiv");
 479     vgl->GetShaderiv   = (PFNGLGETSHADERIVPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetShaderiv");
 480     vgl->GetProgramInfoLog  = (PFNGLGETPROGRAMINFOLOGPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetProgramInfoLog");
 481     vgl->GetShaderInfoLog   = (PFNGLGETSHADERINFOLOGPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetShaderInfoLog");
 482
 483     vgl->DeleteShader  = (PFNGLDELETESHADERPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteShader");
 484
 485     vgl->GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetUniformLocation");
 486     vgl->GetAttribLocation  = (PFNGLGETATTRIBLOCATIONPROC)vlc_gl_GetProcAddress(vgl->gl, "glGetAttribLocation");
 487     vgl->VertexAttribPointer= (PFNGLVERTEXATTRIBPOINTERPROC)vlc_gl_GetProcAddress(vgl->gl, "glVertexAttribPointer");
 488     vgl->EnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)vlc_gl_GetProcAddress(vgl->gl, "glEnableVertexAttribArray");
 489     vgl->UniformMatrix4fv   = (PFNGLUNIFORMMATRIX4FVPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniformMatrix4fv");
 490     vgl->Uniform4fv    = (PFNGLUNIFORM4FVPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform4fv");
 491     vgl->Uniform4f     = (PFNGLUNIFORM4FPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform4f");
 492     vgl->Uniform1i     = (PFNGLUNIFORM1IPROC)vlc_gl_GetProcAddress(vgl->gl,"glUniform1i");
 493
 494     vgl->CreateProgram = (PFNGLCREATEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glCreateProgram");
 495     vgl->LinkProgram   = (PFNGLLINKPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glLinkProgram");
 496     vgl->UseProgram    = (PFNGLUSEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glUseProgram");
 497     vgl->DeleteProgram = (PFNGLDELETEPROGRAMPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteProgram");
 498
 499     vgl->GenBuffers    = (PFNGLGENBUFFERSPROC)vlc_gl_GetProcAddress(vgl->gl, "glGenBuffers");
 500     vgl->BindBuffer    = (PFNGLBINDBUFFERPROC)vlc_gl_GetProcAddress(vgl->gl, "glBindBuffer");
 501     vgl->BufferData    = (PFNGLBUFFERDATAPROC)vlc_gl_GetProcAddress(vgl->gl, "glBufferData");
 502     vgl->DeleteBuffers = (PFNGLDELETEBUFFERSPROC)vlc_gl_GetProcAddress(vgl->gl, "glDeleteBuffers");
 503
 504     if (!vgl->CreateShader || !vgl->ShaderSource || !vgl->CreateProgram)
 505         supports_shaders = false;
 506 #endif
 507
 508 #if defined(_WIN32)
 509     vgl->ActiveTexture = (PFNGLACTIVETEXTUREPROC)vlc_gl_GetProcAddress(vgl->gl, "glActiveTexture");
 510     vgl->ClientActiveTexture = (PFNGLCLIENTACTIVETEXTUREPROC)vlc_gl_GetProcAddress(vgl->gl, "glClientActiveTexture");
 511 #   define glActiveTexture vgl->ActiveTexture
 512 #   define glClientActiveTexture vgl->ClientActiveTexture
 513 #endif
 514
 515     vgl->supports_npot = HasExtension(extensions, "GL_ARB_texture_non_power_of_two") ||
 516                          HasExtension(extensions, "GL_APPLE_texture_2D_limited_npot");
 517
 518 #if USE_OPENGL_ES == 2
 519     /* OpenGL ES 2 includes support for non-power of 2 textures by specification
 520      * so checks for extensions are bound to fail. Check for OpenGL ES version instead. */
 521     vgl->supports_npot = true;
 522 #endif
 523
 524     GLint max_texture_units = 0;
 525     glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_units);
 526
 527 #ifdef __APPLE__
 528 #if USE_OPENGL_ES
 529     /* work-around an iOS 6 bug */
 530     if (kCFCoreFoundationVersionNumber >= 786.)
 531         max_texture_units = 8;
 532     supports_shaders = true;
 533 #endif
 534 #endif
 535
 536     /* Initialize with default chroma */
 537     vgl->fmt = *fmt;
 538     vgl->fmt.i_chroma = VLC_CODEC_RGB32;
 539 #   if defined(WORDS_BIGENDIAN)
 540     vgl->fmt.i_rmask  = 0xff000000;
 541     vgl->fmt.i_gmask  = 0x00ff0000;
 542     vgl->fmt.i_bmask  = 0x0000ff00;
 543 #   else
 544     vgl->fmt.i_rmask  = 0x000000ff;
 545     vgl->fmt.i_gmask  = 0x0000ff00;
 546     vgl->fmt.i_bmask  = 0x00ff0000;
 547 #   endif
 548     vgl->tex_target   = GL_TEXTURE_2D;
 549     vgl->tex_format   = GL_RGBA;
 550     vgl->tex_internal = GL_RGBA;
 551     vgl->tex_type     = GL_UNSIGNED_BYTE;
 552     /* Use YUV if possible and needed */
 553     bool need_fs_yuv = false;
 554     bool need_fs_xyz = false;
 555     bool need_fs_rgba = USE_OPENGL_ES == 2;
 556     float yuv_range_correction = 1.0;
 557
 558     if (max_texture_units >= 3 && supports_shaders && vlc_fourcc_IsYUV(fmt->i_chroma)) {
 559         const vlc_fourcc_t *list = vlc_fourcc_GetYUVFallback(fmt->i_chroma);
 560         while (*list) {
 561             const vlc_chroma_description_t *dsc = vlc_fourcc_GetChromaDescription(*list);
 562             if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 1) {
 563                 need_fs_yuv       = true;
 564                 vgl->fmt          = *fmt;
 565                 vgl->fmt.i_chroma = *list;
 566                 vgl->tex_format   = GL_LUMINANCE;
 567                 vgl->tex_internal = GL_LUMINANCE;
 568                 vgl->tex_type     = GL_UNSIGNED_BYTE;
 569                 yuv_range_correction = 1.0;
 570                 break;
 571 #if !USE_OPENGL_ES
 572             } else if (dsc && dsc->plane_count == 3 && dsc->pixel_size == 2 &&
 573                        IsLuminance16Supported(vgl->tex_target)) {
 574                 need_fs_yuv       = true;
 575                 vgl->fmt          = *fmt;
 576                 vgl->fmt.i_chroma = *list;
 577                 vgl->tex_format   = GL_LUMINANCE;
 578                 vgl->tex_internal = GL_LUMINANCE16;
 579                 vgl->tex_type     = GL_UNSIGNED_SHORT;
 580                 yuv_range_correction = (float)((1 << 16) - 1) / ((1 << dsc->pixel_bits) - 1);
 581                 break;
 582 #endif
 583             }
 584             list++;
 585         }
 586     }
 587
 588     if (fmt->i_chroma == VLC_CODEC_XYZ12) {
 589         need_fs_xyz       = true;
 590         vgl->fmt          = *fmt;
 591         vgl->fmt.i_chroma = VLC_CODEC_XYZ12;
 592         vgl->tex_format   = GL_RGB;
 593         vgl->tex_internal = GL_RGB;
 594         vgl->tex_type     = GL_UNSIGNED_SHORT;
 595     }
 596     vgl->chroma = vlc_fourcc_GetChromaDescription(vgl->fmt.i_chroma);
 597     assert(vgl->chroma != NULL);
 598     vgl->use_multitexture = vgl->chroma->plane_count > 1;
 599
 600     /* Texture size */
 601     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 602         int w = vgl->fmt.i_visible_width  * vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den;
 603         int h = vgl->fmt.i_visible_height * vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den;
 604         if (vgl->supports_npot) {
 605             vgl->tex_width[j]  = w;
 606             vgl->tex_height[j] = h;
 607         } else {
 608             vgl->tex_width[j]  = GetAlignedSize(w);
 609             vgl->tex_height[j] = GetAlignedSize(h);
 610         }
 611     }
 612
 613     /* Build program if needed */
 614     vgl->program[0] =
 615     vgl->program[1] = 0;
 616     vgl->shader[0] =
 617     vgl->shader[1] =
 618     vgl->shader[2] = -1;
 619     vgl->local_count = 0;
 620     if (supports_shaders && (need_fs_yuv || need_fs_xyz|| need_fs_rgba)) {
 621 #ifdef SUPPORTS_SHADERS
 622         if (need_fs_xyz)
 623             BuildXYZFragmentShader(vgl, &vgl->shader[0]);
 624         else
 625             BuildYUVFragmentShader(vgl, &vgl->shader[0], &vgl->local_count,
 626                                 vgl->local_value, fmt, yuv_range_correction);
 627
 628         BuildRGBAFragmentShader(vgl, &vgl->shader[1]);
 629         BuildVertexShader(vgl, &vgl->shader[2]);
 630
 631         /* Check shaders messages */
 632         for (unsigned j = 0; j < 3; j++) {
 633             int infoLength;
 634             vgl->GetShaderiv(vgl->shader[j], GL_INFO_LOG_LENGTH, &infoLength);
 635             if (infoLength <= 1)
 636                 continue;
 637
 638             char *infolog = malloc(infoLength);
 639             int charsWritten;
 640             vgl->GetShaderInfoLog(vgl->shader[j], infoLength, &charsWritten, infolog);
 641             fprintf(stderr, "shader %d: %s\n", j, infolog);
 642             free(infolog);
 643         }
 644
 645         vgl->program[0] = vgl->CreateProgram();
 646         vgl->AttachShader(vgl->program[0], vgl->shader[0]);
 647         vgl->AttachShader(vgl->program[0], vgl->shader[2]);
 648         vgl->LinkProgram(vgl->program[0]);
 649
 650         vgl->program[1] = vgl->CreateProgram();
 651         vgl->AttachShader(vgl->program[1], vgl->shader[1]);
 652         vgl->AttachShader(vgl->program[1], vgl->shader[2]);
 653         vgl->LinkProgram(vgl->program[1]);
 654
 655         /* Check program messages */
 656         for (GLuint i = 0; i < 2; i++) {
 657             int infoLength = 0;
 658             vgl->GetProgramiv(vgl->program[i], GL_INFO_LOG_LENGTH, &infoLength);
 659             if (infoLength <= 1)
 660                 continue;
 661             char *infolog = malloc(infoLength);
 662             int charsWritten;
 663             vgl->GetProgramInfoLog(vgl->program[i], infoLength, &charsWritten, infolog);
 664             fprintf(stderr, "shader program %d: %s\n", i, infolog);
 665             free(infolog);
 666
 667             /* If there is some message, better to check linking is ok */
 668             GLint link_status = GL_TRUE;
 669             vgl->GetProgramiv(vgl->program[i], GL_LINK_STATUS, &link_status);
 670             if (link_status == GL_FALSE) {
 671                 fprintf(stderr, "Unable to use program %d\n", i);
 672                 free(vgl);
 673                 return NULL;
 674             }
 675         }
 676 #else
 677         (void)yuv_range_correction;
 678 #endif
 679     }
 680
 681     /* */
 682     glDisable(GL_BLEND);
 683     glDisable(GL_DEPTH_TEST);
 684     glDepthMask(GL_FALSE);
 685     glDisable(GL_CULL_FACE);
 686     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 687     glClear(GL_COLOR_BUFFER_BIT);
 688
 689 #ifdef SUPPORTS_SHADERS
 690     vgl->GenBuffers(1, &vgl->vertex_buffer_object);
 691     vgl->GenBuffers(vgl->chroma->plane_count, vgl->texture_buffer_object);
 692
 693     /* Initial number of allocated buffer objects for subpictures, will grow dynamically. */
 694     int subpicture_buffer_object_count = 8;
 695     vgl->subpicture_buffer_object = malloc(subpicture_buffer_object_count * sizeof(GLuint));
 696     if (!vgl->subpicture_buffer_object) {
 697         vlc_gl_Unlock(vgl->gl);
 698         vout_display_opengl_Delete(vgl);
 699         return NULL;
 700     }
 701     vgl->subpicture_buffer_object_count = subpicture_buffer_object_count;
 702     vgl->GenBuffers(vgl->subpicture_buffer_object_count, vgl->subpicture_buffer_object);
 703 #endif
 704
 705     vlc_gl_Unlock(vgl->gl);
 706
 707     /* */
 708     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 709         for (int j = 0; j < PICTURE_PLANE_MAX; j++)
 710             vgl->texture[i][j] = 0;
 711     }
 712     vgl->region_count = 0;
 713     vgl->region = NULL;
 714     vgl->pool = NULL;
 715
 716     *fmt = vgl->fmt;
 717     if (subpicture_chromas) {
 718         *subpicture_chromas = gl_subpicture_chromas;
 719     }
 720     return vgl;
 721 }
 722
 723 void vout_display_opengl_Delete(vout_display_opengl_t *vgl)
 724 {
 725     /* */
 726     if (!vlc_gl_Lock(vgl->gl)) {
 727         glFinish();
 728         glFlush();
 729         for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++)
 730             glDeleteTextures(vgl->chroma->plane_count, vgl->texture[i]);
 731         for (int i = 0; i < vgl->region_count; i++) {
 732             if (vgl->region[i].texture)
 733                 glDeleteTextures(1, &vgl->region[i].texture);
 734         }
 735         free(vgl->region);
 736
 737 #ifdef SUPPORTS_SHADERS
 738         if (vgl->program[0]) {
 739             for (int i = 0; i < 2; i++)
 740                 vgl->DeleteProgram(vgl->program[i]);
 741             for (int i = 0; i < 3; i++)
 742                 vgl->DeleteShader(vgl->shader[i]);
 743         }
 744         vgl->DeleteBuffers(1, &vgl->vertex_buffer_object);
 745         vgl->DeleteBuffers(vgl->chroma->plane_count, vgl->texture_buffer_object);
 746         if (vgl->subpicture_buffer_object_count > 0)
 747             vgl->DeleteBuffers(vgl->subpicture_buffer_object_count, vgl->subpicture_buffer_object);
 748         free(vgl->subpicture_buffer_object);
 749 #endif
 750
 751         free(vgl->texture_temp_buf);
 752         vlc_gl_Unlock(vgl->gl);
 753     }
 754     if (vgl->pool)
 755         picture_pool_Release(vgl->pool);
 756     free(vgl);
 757 }
 758
 759 picture_pool_t *vout_display_opengl_GetPool(vout_display_opengl_t *vgl, unsigned requested_count)
 760 {
 761     if (vgl->pool)
 762         return vgl->pool;
 763
 764     /* Allocate our pictures */
 765     picture_t *picture[VLCGL_PICTURE_MAX] = {NULL, };
 766     unsigned count;
 767
 768     for (count = 0; count < __MIN(VLCGL_PICTURE_MAX, requested_count); count++) {
 769         picture[count] = picture_NewFromFormat(&vgl->fmt);
 770         if (!picture[count])
 771             break;
 772     }
 773     if (count <= 0)
 774         return NULL;
 775
 776     /* Wrap the pictures into a pool */
 777     vgl->pool = picture_pool_New(count, picture);
 778     if (!vgl->pool)
 779         goto error;
 780
 781     /* Allocates our textures */
 782     if (vlc_gl_Lock(vgl->gl))
 783         return vgl->pool;
 784
 785     for (int i = 0; i < VLCGL_TEXTURE_COUNT; i++) {
 786         glGenTextures(vgl->chroma->plane_count, vgl->texture[i]);
 787         for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 788             if (vgl->use_multitexture) {
 789                 glActiveTexture(GL_TEXTURE0 + j);
 790                 glClientActiveTexture(GL_TEXTURE0 + j);
 791             }
 792             glBindTexture(vgl->tex_target, vgl->texture[i][j]);
 793
 794 #if !USE_OPENGL_ES
 795             /* Set the texture parameters */
 796             glTexParameterf(vgl->tex_target, GL_TEXTURE_PRIORITY, 1.0);
 797             glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 798 #endif
 799
 800             glTexParameteri(vgl->tex_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 801             glTexParameteri(vgl->tex_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 802             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 803             glTexParameteri(vgl->tex_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 804
 805             /* Call glTexImage2D only once, and use glTexSubImage2D later */
 806             glTexImage2D(vgl->tex_target, 0,
 807                          vgl->tex_internal, vgl->tex_width[j], vgl->tex_height[j],
 808                          0, vgl->tex_format, vgl->tex_type, NULL);
 809         }
 810     }
 811
 812     vlc_gl_Unlock(vgl->gl);
 813
 814     return vgl->pool;
 815
 816 error:
 817     for (unsigned i = 0; i < count; i++)
 818         picture_Release(picture[i]);
 819     return NULL;
 820 }
 821
 822 #define ALIGN(x, y) (((x) + ((y) - 1)) & ~((y) - 1))
 823 static void Upload(vout_display_opengl_t *vgl, int in_width, int in_height,
 824                    int in_full_width, int in_full_height,
 825                    int w_num, int w_den, int h_num, int h_den,
 826                    int pitch, int pixel_pitch,
 827                    int full_upload, const uint8_t *pixels,
 828                    int tex_target, int tex_format, int tex_type)
 829 {
 830     int width       =       in_width * w_num / w_den;
 831     int full_width  =  in_full_width * w_num / w_den;
 832     int height      =      in_height * h_num / h_den;
 833     int full_height = in_full_height * h_num / h_den;
 834     // This unpack alignment is the default, but setting it just in case.
 835     glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
 836 #ifndef GL_UNPACK_ROW_LENGTH
 837     int dst_width = full_upload ? full_width : width;
 838     int dst_pitch = ALIGN(dst_width * pixel_pitch, 4);
 839     if ( pitch != dst_pitch )
 840     {
 841         int buf_size = dst_pitch * full_height * pixel_pitch;
 842         const uint8_t *source = pixels;
 843         uint8_t *destination;
 844         if( !vgl->texture_temp_buf || vgl->texture_temp_buf_size < buf_size )
 845         {
 846             free( vgl->texture_temp_buf );
 847             vgl->texture_temp_buf = xmalloc( buf_size );
 848             vgl->texture_temp_buf_size = buf_size;
 849         }
 850         destination = vgl->texture_temp_buf;
 851
 852         for( int h = 0; h < height ; h++ )
 853         {
 854             memcpy( destination, source, width * pixel_pitch );
 855             source += pitch;
 856             destination += dst_pitch;
 857         }
 858         if (full_upload)
 859             glTexImage2D( tex_target, 0, tex_format,
 860                           full_width, full_height,
 861                           0, tex_format, tex_type, vgl->texture_temp_buf );
 862         else
 863             glTexSubImage2D( tex_target, 0,
 864                              0, 0,
 865                              width, height,
 866                              tex_format, tex_type, vgl->texture_temp_buf );
 867     } else {
 868 #else
 869     (void) width;
 870     (void) height;
 871     (void) vgl;
 872     {
 873         glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch / pixel_pitch);
 874 #endif
 875         if (full_upload)
 876             glTexImage2D(tex_target, 0, tex_format,
 877                          full_width, full_height,
 878                          0, tex_format, tex_type, pixels);
 879         else
 880             glTexSubImage2D(tex_target, 0,
 881                             0, 0,
 882                             width, height,
 883                             tex_format, tex_type, pixels);
 884     }
 885 }
 886
 887 int vout_display_opengl_Prepare(vout_display_opengl_t *vgl,
 888                                 picture_t *picture, subpicture_t *subpicture)
 889 {
 890     if (vlc_gl_Lock(vgl->gl))
 891         return VLC_EGENERIC;
 892
 893     /* Update the texture */
 894     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
 895         if (vgl->use_multitexture) {
 896             glActiveTexture(GL_TEXTURE0 + j);
 897             glClientActiveTexture(GL_TEXTURE0 + j);
 898         }
 899         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
 900
 901         Upload(vgl, picture->format.i_visible_width, vgl->fmt.i_visible_height,
 902                vgl->fmt.i_width, vgl->fmt.i_height,
 903                vgl->chroma->p[j].w.num, vgl->chroma->p[j].w.den, vgl->chroma->p[j].h.num, vgl->chroma->p[j].h.den,
 904                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);
 905     }
 906
 907     int         last_count = vgl->region_count;
 908     gl_region_t *last = vgl->region;
 909
 910     vgl->region_count = 0;
 911     vgl->region       = NULL;
 912
 913     if (subpicture) {
 914
 915         int count = 0;
 916         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next)
 917             count++;
 918
 919         vgl->region_count = count;
 920         vgl->region       = calloc(count, sizeof(*vgl->region));
 921
 922         if (vgl->use_multitexture) {
 923             glActiveTexture(GL_TEXTURE0 + 0);
 924             glClientActiveTexture(GL_TEXTURE0 + 0);
 925         }
 926         int i = 0;
 927         for (subpicture_region_t *r = subpicture->p_region; r; r = r->p_next, i++) {
 928             gl_region_t *glr = &vgl->region[i];
 929
 930             glr->format = GL_RGBA;
 931             glr->type   = GL_UNSIGNED_BYTE;
 932             glr->width  = r->fmt.i_visible_width;
 933             glr->height = r->fmt.i_visible_height;
 934             if (!vgl->supports_npot) {
 935                 glr->width  = GetAlignedSize(glr->width);
 936                 glr->height = GetAlignedSize(glr->height);
 937                 glr->tex_width  = (float) r->fmt.i_visible_width  / glr->width;
 938                 glr->tex_height = (float) r->fmt.i_visible_height / glr->height;
 939             } else {
 940                 glr->tex_width  = 1.0;
 941                 glr->tex_height = 1.0;
 942             }
 943             glr->alpha  = (float)subpicture->i_alpha * r->i_alpha / 255 / 255;
 944             glr->left   =  2.0 * (r->i_x                          ) / subpicture->i_original_picture_width  - 1.0;
 945             glr->top    = -2.0 * (r->i_y                          ) / subpicture->i_original_picture_height + 1.0;
 946             glr->right  =  2.0 * (r->i_x + r->fmt.i_visible_width ) / subpicture->i_original_picture_width  - 1.0;
 947             glr->bottom = -2.0 * (r->i_y + r->fmt.i_visible_height) / subpicture->i_original_picture_height + 1.0;
 948
 949             glr->texture = 0;
 950             /* Try to recycle the textures allocated by the previous
 951                call to this function. */
 952             for (int j = 0; j < last_count; j++) {
 953                 if (last[j].texture &&
 954                     last[j].width  == glr->width &&
 955                     last[j].height == glr->height &&
 956                     last[j].format == glr->format &&
 957                     last[j].type   == glr->type) {
 958                     glr->texture = last[j].texture;
 959                     memset(&last[j], 0, sizeof(last[j]));
 960                     break;
 961                 }
 962             }
 963
 964             const int pixels_offset = r->fmt.i_y_offset * r->p_picture->p->i_pitch +
 965                                       r->fmt.i_x_offset * r->p_picture->p->i_pixel_pitch;
 966             if (glr->texture) {
 967                 /* A texture was successfully recycled, reuse it. */
 968                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 969                 Upload(vgl, r->fmt.i_visible_width, r->fmt.i_visible_height, glr->width, glr->height, 1, 1, 1, 1,
 970                        r->p_picture->p->i_pitch, r->p_picture->p->i_pixel_pitch, 0,
 971                        &r->p_picture->p->p_pixels[pixels_offset], GL_TEXTURE_2D, glr->format, glr->type);
 972             } else {
 973                 /* Could not recycle a previous texture, generate a new one. */
 974                 glGenTextures(1, &glr->texture);
 975                 glBindTexture(GL_TEXTURE_2D, glr->texture);
 976 #if !USE_OPENGL_ES
 977                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_PRIORITY, 1.0);
 978                 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 979 #endif
 980                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 981                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 982                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 983                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 984                 Upload(vgl, r->fmt.i_visible_width, r->fmt.i_visible_height, glr->width, glr->height, 1, 1, 1, 1,
 985                        r->p_picture->p->i_pitch, r->p_picture->p->i_pixel_pitch, 1,
 986                        &r->p_picture->p->p_pixels[pixels_offset], GL_TEXTURE_2D, glr->format, glr->type);
 987             }
 988         }
 989     }
 990     for (int i = 0; i < last_count; i++) {
 991         if (last[i].texture)
 992             glDeleteTextures(1, &last[i].texture);
 993     }
 994     free(last);
 995
 996     vlc_gl_Unlock(vgl->gl);
 997     VLC_UNUSED(subpicture);
 998     return VLC_SUCCESS;
 999 }
1000
1001 static const GLfloat identity[] = {
1002     1.0f, 0.0f, 0.0f, 0.0f,
1003     0.0f, 1.0f, 0.0f, 0.0f,
1004     0.0f, 0.0f, 1.0f, 0.0f,
1005     0.0f, 0.0f, 0.0f, 1.0f
1006 };
1007
1008 static void orientationTransformMatrix(GLfloat matrix[static 16], video_orientation_t orientation) {
1009
1010     memcpy(matrix, identity, sizeof(identity));
1011
1012     const int k_cos_pi = -1;
1013     const int k_cos_pi_2 = 0;
1014     const int k_cos_n_pi_2 = 0;
1015
1016     const int k_sin_pi = 0;
1017     const int k_sin_pi_2 = 1;
1018     const int k_sin_n_pi_2 = -1;
1019
1020     bool rotate = false;
1021     int cos = 0, sin = 0;
1022
1023     switch (orientation) {
1024
1025         case ORIENT_ROTATED_90:
1026             cos = k_cos_pi_2;
1027             sin = k_sin_pi_2;
1028             rotate = true;
1029             break;
1030         case ORIENT_ROTATED_180:
1031             cos = k_cos_pi;
1032             sin = k_sin_pi;
1033             rotate = true;
1034             break;
1035         case ORIENT_ROTATED_270:
1036             cos = k_cos_n_pi_2;
1037             sin = k_sin_n_pi_2;
1038             rotate = true;
1039             break;
1040         case ORIENT_HFLIPPED:
1041             matrix[0 * 4 + 0] = -1;
1042             break;
1043         case ORIENT_VFLIPPED:
1044             matrix[1 * 4 + 1] = -1;
1045             break;
1046         case ORIENT_TRANSPOSED:
1047             matrix[0 * 4 + 0] = 0;
1048             matrix[0 * 4 + 1] = -1;
1049             matrix[1 * 4 + 0] = -1;
1050             matrix[1 * 4 + 1] = 0;
1051             break;
1052         case ORIENT_ANTI_TRANSPOSED:
1053             matrix[0 * 4 + 0] = 0;
1054             matrix[0 * 4 + 1] = 1;
1055             matrix[1 * 4 + 0] = 1;
1056             matrix[1 * 4 + 1] = 0;
1057             break;
1058         default:
1059             break;
1060     }
1061
1062     if (rotate) {
1063
1064         matrix[0 * 4 + 0] = cos;
1065         matrix[0 * 4 + 1] = -sin;
1066         matrix[1 * 4 + 0] = sin;
1067         matrix[1 * 4 + 1] = cos;
1068     }
1069 }
1070
1071 #ifdef SUPPORTS_FIXED_PIPELINE
1072 static void DrawWithoutShaders(vout_display_opengl_t *vgl,
1073                                float *left, float *top, float *right, float *bottom)
1074 {
1075     static const GLfloat vertexCoord[] = {
1076         -1.0f, -1.0f,
1077          1.0f, -1.0f,
1078         -1.0f,  1.0f,
1079          1.0f,  1.0f,
1080     };
1081
1082     const GLfloat textureCoord[] = {
1083         left[0],  bottom[0],
1084         right[0], bottom[0],
1085         left[0],  top[0],
1086         right[0], top[0]
1087     };
1088
1089     GLfloat transformMatrix[16];
1090     orientationTransformMatrix(transformMatrix, vgl->fmt.orientation);
1091
1092     glPushMatrix();
1093     glMatrixMode(GL_MODELVIEW);
1094     glLoadMatrixf(transformMatrix);
1095
1096     glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
1097     glEnable(vgl->tex_target);
1098     glActiveTexture(GL_TEXTURE0 + 0);
1099     glClientActiveTexture(GL_TEXTURE0 + 0);
1100
1101     glBindTexture(vgl->tex_target, vgl->texture[0][0]);
1102
1103     glEnableClientState(GL_VERTEX_ARRAY);
1104     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
1105
1106     glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
1107     glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
1108
1109     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1110
1111     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
1112     glDisableClientState(GL_VERTEX_ARRAY);
1113     glDisable(vgl->tex_target);
1114
1115     glPopMatrix();
1116
1117 }
1118 #endif
1119
1120 #ifdef SUPPORTS_SHADERS
1121 static void DrawWithShaders(vout_display_opengl_t *vgl,
1122                             float *left, float *top, float *right, float *bottom,
1123                             int program)
1124 {
1125     vgl->UseProgram(vgl->program[program]);
1126     if (program == 0) {
1127         if (vgl->chroma->plane_count == 3) {
1128             vgl->Uniform4fv(vgl->GetUniformLocation(vgl->program[0], "Coefficient"), 4, vgl->local_value);
1129             vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture0"), 0);
1130             vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture1"), 1);
1131             vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture2"), 2);
1132         }
1133         else if (vgl->chroma->plane_count == 1) {
1134             vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[0], "Texture0"), 0);
1135         }
1136     } else {
1137         vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[1], "Texture0"), 0);
1138         vgl->Uniform4f(vgl->GetUniformLocation(vgl->program[1], "FillColor"), 1.0f, 1.0f, 1.0f, 1.0f);
1139     }
1140
1141     static const GLfloat vertexCoord[] = {
1142         -1.0,  1.0,
1143         -1.0, -1.0,
1144          1.0,  1.0,
1145          1.0, -1.0,
1146     };
1147
1148     GLfloat transformMatrix[16];
1149     orientationTransformMatrix(transformMatrix, vgl->fmt.orientation);
1150
1151     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
1152         const GLfloat textureCoord[] = {
1153             left[j],  top[j],
1154             left[j],  bottom[j],
1155             right[j], top[j],
1156             right[j], bottom[j],
1157         };
1158         glActiveTexture(GL_TEXTURE0+j);
1159         glClientActiveTexture(GL_TEXTURE0+j);
1160         glBindTexture(vgl->tex_target, vgl->texture[0][j]);
1161
1162         vgl->BindBuffer(GL_ARRAY_BUFFER, vgl->texture_buffer_object[j]);
1163         vgl->BufferData(GL_ARRAY_BUFFER, sizeof(textureCoord), textureCoord, GL_STATIC_DRAW);
1164
1165         char attribute[20];
1166         snprintf(attribute, sizeof(attribute), "MultiTexCoord%1d", j);
1167         vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[program], attribute));
1168         vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[program], attribute), 2, GL_FLOAT, 0, 0, 0);
1169     }
1170     glActiveTexture(GL_TEXTURE0 + 0);
1171     glClientActiveTexture(GL_TEXTURE0 + 0);
1172
1173     vgl->BindBuffer(GL_ARRAY_BUFFER, vgl->vertex_buffer_object);
1174     vgl->BufferData(GL_ARRAY_BUFFER, sizeof(vertexCoord), vertexCoord, GL_STATIC_DRAW);
1175     vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[program], "VertexPosition"));
1176     vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[program], "VertexPosition"), 2, GL_FLOAT, 0, 0, 0);
1177
1178     vgl->UniformMatrix4fv(vgl->GetUniformLocation(vgl->program[program], "RotationMatrix"), 1, GL_FALSE, transformMatrix);
1179
1180     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1181 }
1182 #endif
1183
1184 int vout_display_opengl_Display(vout_display_opengl_t *vgl,
1185                                 const video_format_t *source)
1186 {
1187     if (vlc_gl_Lock(vgl->gl))
1188         return VLC_EGENERIC;
1189
1190     /* Why drawing here and not in Render()? Because this way, the
1191        OpenGL providers can call vout_display_opengl_Display to force redraw.i
1192        Currently, the OS X provider uses it to get a smooth window resizing */
1193     glClear(GL_COLOR_BUFFER_BIT);
1194
1195     /* Draw the picture */
1196     float left[PICTURE_PLANE_MAX];
1197     float top[PICTURE_PLANE_MAX];
1198     float right[PICTURE_PLANE_MAX];
1199     float bottom[PICTURE_PLANE_MAX];
1200     for (unsigned j = 0; j < vgl->chroma->plane_count; j++) {
1201         /* glTexCoord works differently with GL_TEXTURE_2D and
1202            GL_TEXTURE_RECTANGLE_EXT */
1203         float scale_w, scale_h;
1204
1205         if (vgl->tex_target == GL_TEXTURE_2D) {
1206             scale_w = (float)vgl->chroma->p[j].w.num / vgl->chroma->p[j].w.den / vgl->tex_width[j];
1207             scale_h = (float)vgl->chroma->p[j].h.num / vgl->chroma->p[j].h.den / vgl->tex_height[j];
1208
1209         } else {
1210             scale_w = 1.0;
1211             scale_h = 1.0;
1212         }
1213         /* Warning: if NPOT is not supported a larger texture is
1214            allocated. This will cause right and bottom coordinates to
1215            land on the edge of two texels with the texels to the
1216            right/bottom uninitialized by the call to
1217            glTexSubImage2D. This might cause a green line to appear on
1218            the right/bottom of the display.
1219            There are two possible solutions:
1220            - Manually mirror the edges of the texture.
1221            - Add a "-1" when computing right and bottom, however the
1222            last row/column might not be displayed at all.
1223         */
1224         left[j]   = (source->i_x_offset +                       0 ) * scale_w;
1225         top[j]    = (source->i_y_offset +                       0 ) * scale_h;
1226         right[j]  = (source->i_x_offset + source->i_visible_width ) * scale_w;
1227         bottom[j] = (source->i_y_offset + source->i_visible_height) * scale_h;
1228     }
1229
1230 #ifdef SUPPORTS_SHADERS
1231     if (vgl->program[0] && (vgl->chroma->plane_count == 3 || vgl->chroma->plane_count == 1))
1232         DrawWithShaders(vgl, left, top, right, bottom, 0);
1233     else if (vgl->program[1] && vgl->chroma->plane_count == 1)
1234         DrawWithShaders(vgl, left, top, right, bottom, 1);
1235     else
1236 #endif
1237     {
1238 #ifdef SUPPORTS_FIXED_PIPELINE
1239         DrawWithoutShaders(vgl, left, top, right, bottom);
1240 #endif
1241     }
1242
1243     /* Draw the subpictures */
1244     if (vgl->program[1]) {
1245 #ifdef SUPPORTS_SHADERS
1246         // Change the program for overlays
1247         vgl->UseProgram(vgl->program[1]);
1248         vgl->Uniform1i(vgl->GetUniformLocation(vgl->program[1], "Texture"), 0);
1249 #endif
1250     }
1251
1252 #ifdef SUPPORTS_FIXED_PIPELINE
1253     glEnable(GL_TEXTURE_2D);
1254 #endif
1255     glEnable(GL_BLEND);
1256     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
1257
1258 #ifdef SUPPORTS_SHADERS
1259     /* We need two buffer objects for each region: for vertex and texture coordinates. */
1260     if (2 * vgl->region_count > vgl->subpicture_buffer_object_count) {
1261         if (vgl->subpicture_buffer_object_count > 0)
1262             vgl->DeleteBuffers(vgl->subpicture_buffer_object_count, vgl->subpicture_buffer_object);
1263         vgl->subpicture_buffer_object_count = 0;
1264
1265         int new_count = 2 * vgl->region_count;
1266         vgl->subpicture_buffer_object = realloc_or_free(vgl->subpicture_buffer_object, new_count * sizeof(GLuint));
1267         if (!vgl->subpicture_buffer_object) {
1268             vlc_gl_Unlock(vgl->gl);
1269             return VLC_ENOMEM;
1270         }
1271
1272         vgl->subpicture_buffer_object_count = new_count;
1273         vgl->GenBuffers(vgl->subpicture_buffer_object_count, vgl->subpicture_buffer_object);
1274     }
1275 #endif
1276
1277     glActiveTexture(GL_TEXTURE0 + 0);
1278     glClientActiveTexture(GL_TEXTURE0 + 0);
1279     for (int i = 0; i < vgl->region_count; i++) {
1280         gl_region_t *glr = &vgl->region[i];
1281         const GLfloat vertexCoord[] = {
1282             glr->left,  glr->top,
1283             glr->left,  glr->bottom,
1284             glr->right, glr->top,
1285             glr->right, glr->bottom,
1286         };
1287         const GLfloat textureCoord[] = {
1288             0.0, 0.0,
1289             0.0, glr->tex_height,
1290             glr->tex_width, 0.0,
1291             glr->tex_width, glr->tex_height,
1292         };
1293
1294         glBindTexture(GL_TEXTURE_2D, glr->texture);
1295         if (vgl->program[1]) {
1296 #ifdef SUPPORTS_SHADERS
1297             vgl->Uniform4f(vgl->GetUniformLocation(vgl->program[1], "FillColor"), 1.0f, 1.0f, 1.0f, glr->alpha);
1298
1299             vgl->BindBuffer(GL_ARRAY_BUFFER, vgl->subpicture_buffer_object[2 * i]);
1300             vgl->BufferData(GL_ARRAY_BUFFER, sizeof(textureCoord), textureCoord, GL_STATIC_DRAW);
1301             vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[1], "MultiTexCoord0"));
1302             vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[1], "MultiTexCoord0"), 2, GL_FLOAT, 0, 0, 0);
1303
1304             vgl->BindBuffer(GL_ARRAY_BUFFER, vgl->subpicture_buffer_object[2 * i + 1]);
1305             vgl->BufferData(GL_ARRAY_BUFFER, sizeof(vertexCoord), vertexCoord, GL_STATIC_DRAW);
1306             vgl->EnableVertexAttribArray(vgl->GetAttribLocation(vgl->program[1], "VertexPosition"));
1307             vgl->VertexAttribPointer(vgl->GetAttribLocation(vgl->program[1], "VertexPosition"), 2, GL_FLOAT, 0, 0, 0);
1308
1309             // Subpictures have the correct orientation:
1310             vgl->UniformMatrix4fv(vgl->GetUniformLocation(vgl->program[1], "RotationMatrix"), 1, GL_FALSE, identity);
1311 #endif
1312         } else {
1313 #ifdef SUPPORTS_FIXED_PIPELINE
1314             glEnableClientState(GL_VERTEX_ARRAY);
1315             glEnableClientState(GL_TEXTURE_COORD_ARRAY);
1316             glColor4f(1.0f, 1.0f, 1.0f, glr->alpha);
1317             glTexCoordPointer(2, GL_FLOAT, 0, textureCoord);
1318             glVertexPointer(2, GL_FLOAT, 0, vertexCoord);
1319 #endif
1320         }
1321
1322         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
1323
1324         if (!vgl->program[1]) {
1325 #ifdef SUPPORTS_FIXED_PIPELINE
1326             glDisableClientState(GL_TEXTURE_COORD_ARRAY);
1327             glDisableClientState(GL_VERTEX_ARRAY);
1328 #endif
1329         }
1330     }
1331     glDisable(GL_BLEND);
1332 #ifdef SUPPORTS_FIXED_PIPELINE
1333     glDisable(GL_TEXTURE_2D);
1334 #endif
1335
1336     /* Display */
1337     vlc_gl_Swap(vgl->gl);
1338
1339     vlc_gl_Unlock(vgl->gl);
1340     return VLC_SUCCESS;
1341 }
1342