src/wx/gl_video_view.cc

   1 /*
   2     Copyright (C) 2018-2021 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21
  22 #ifdef DCPOMATIC_WINDOWS
  23 #include <GL/glew.h>
  24 #endif
  25
  26 #include "gl_video_view.h"
  27 #include "film_viewer.h"
  28 #include "wx_util.h"
  29 #include "lib/image.h"
  30 #include "lib/dcpomatic_assert.h"
  31 #include "lib/exceptions.h"
  32 #include "lib/cross.h"
  33 #include "lib/player_video.h"
  34 #include "lib/butler.h"
  35 #include <boost/bind/bind.hpp>
  36 #include <iostream>
  37
  38 #ifdef DCPOMATIC_OSX
  39 #define GL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED
  40 #include <OpenGL/OpenGL.h>
  41 #include <OpenGL/gl3.h>
  42 #endif
  43
  44 #ifdef DCPOMATIC_LINUX
  45 #include <GL/glu.h>
  46 #include <GL/glext.h>
  47 #endif
  48
  49 #ifdef DCPOMATIC_WINDOWS
  50 #include <GL/glu.h>
  51 #include <GL/wglext.h>
  52 #endif
  53
  54
  55 using std::cout;
  56 using std::shared_ptr;
  57 using std::string;
  58 using boost::optional;
  59 #if BOOST_VERSION >= 106100
  60 using namespace boost::placeholders;
  61 #endif
  62
  63
  64 static void
  65 check_gl_error (char const * last)
  66 {
  67         GLenum const e = glGetError ();
  68         if (e != GL_NO_ERROR) {
  69                 throw GLError (last, e);
  70         }
  71 }
  72
  73
  74 GLVideoView::GLVideoView (FilmViewer* viewer, wxWindow *parent)
  75         : VideoView (viewer)
  76         , _context (nullptr)
  77         , _vsync_enabled (false)
  78         , _playing (false)
  79         , _one_shot (false)
  80 {
  81         wxGLAttributes attributes;
  82         /* We don't need a depth buffer, and indeed there is apparently a bug with Windows/Intel HD 630
  83          * which puts green lines over the OpenGL display if you have a non-zero depth buffer size.
  84          * https://community.intel.com/t5/Graphics/Request-for-details-on-Intel-HD-630-green-lines-in-OpenGL-apps/m-p/1202179
  85          */
  86         attributes.PlatformDefaults().MinRGBA(8, 8, 8, 8).DoubleBuffer().Depth(0).EndList();
  87         _canvas = new wxGLCanvas (
  88                 parent, attributes, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE
  89         );
  90         _canvas->Bind (wxEVT_PAINT, boost::bind(&GLVideoView::update, this));
  91         _canvas->Bind (wxEVT_SIZE, boost::bind(&GLVideoView::size_changed, this, _1));
  92
  93         _canvas->Bind (wxEVT_TIMER, boost::bind(&GLVideoView::check_for_butler_errors, this));
  94         _timer.reset (new wxTimer(_canvas));
  95         _timer->Start (2000);
  96 }
  97
  98
  99 void
 100 GLVideoView::size_changed (wxSizeEvent const& ev)
 101 {
 102         _canvas_size = ev.GetSize ();
 103         Sized ();
 104 }
 105
 106
 107
 108 GLVideoView::~GLVideoView ()
 109 {
 110         boost::this_thread::disable_interruption dis;
 111
 112         try {
 113                 _thread.interrupt ();
 114                 _thread.join ();
 115         } catch (...) {}
 116 }
 117
 118 void
 119 GLVideoView::check_for_butler_errors ()
 120 {
 121         if (!_viewer->butler()) {
 122                 return;
 123         }
 124
 125         try {
 126                 _viewer->butler()->rethrow ();
 127         } catch (DecodeError& e) {
 128                 error_dialog (get(), e.what());
 129         } catch (dcp::ReadError& e) {
 130                 error_dialog (get(), wxString::Format(_("Could not read DCP: %s"), std_to_wx(e.what())));
 131         }
 132 }
 133
 134
 135 /** Called from the UI thread */
 136 void
 137 GLVideoView::update ()
 138 {
 139         if (!_canvas->IsShownOnScreen()) {
 140                 return;
 141         }
 142
 143         /* It appears important to do this from the GUI thread; if we do it from the GL thread
 144          * on Linux we get strange failures to create the context for any version of GL higher
 145          * than 3.2.
 146          */
 147         ensure_context ();
 148
 149 #ifdef DCPOMATIC_OSX
 150         /* macOS gives errors if we don't do this (and therefore [NSOpenGLContext setView:]) from the main thread */
 151         if (!_setup_shaders_done) {
 152                 setup_shaders ();
 153                 _setup_shaders_done = true;
 154         }
 155 #endif
 156
 157         if (!_thread.joinable()) {
 158                 _thread = boost::thread (boost::bind(&GLVideoView::thread, this));
 159         }
 160
 161         request_one_shot ();
 162
 163         rethrow ();
 164 }
 165
 166
 167 static constexpr char vertex_source[] =
 168 "#version 330 core\n"
 169 "\n"
 170 "layout (location = 0) in vec3 in_pos;\n"
 171 "layout (location = 1) in vec2 in_tex_coord;\n"
 172 "\n"
 173 "out vec2 TexCoord;\n"
 174 "\n"
 175 "void main()\n"
 176 "{\n"
 177 "       gl_Position = vec4(in_pos, 1.0);\n"
 178 "       TexCoord = in_tex_coord;\n"
 179 "}\n";
 180
 181
 182 /* Bicubic interpolation stolen from https://stackoverflow.com/questions/13501081/efficient-bicubic-filtering-code-in-glsl */
 183 static constexpr char fragment_source[] =
 184 "#version 330 core\n"
 185 "\n"
 186 "in vec2 TexCoord;\n"
 187 "\n"
 188 "uniform sampler2D texture_sampler;\n"
 189 /* type = 0: draw border
 190  * type = 1: draw XYZ image
 191  * type = 2: draw RGB image
 192  */
 193 "uniform int type = 0;\n"
 194 "uniform vec4 border_colour;\n"
 195 "uniform mat4 colour_conversion;\n"
 196 "\n"
 197 "out vec4 FragColor;\n"
 198 "\n"
 199 "vec4 cubic(float x)\n"
 200 "\n"
 201 "#define IN_GAMMA 2.2\n"
 202 "#define OUT_GAMMA 0.384615385\n"       //  1 /  2.6
 203 "#define DCI_COEFFICIENT 0.91655528\n"  // 48 / 53.37
 204 "\n"
 205 "{\n"
 206 "    float x2 = x * x;\n"
 207 "    float x3 = x2 * x;\n"
 208 "    vec4 w;\n"
 209 "    w.x =     -x3 + 3 * x2 - 3 * x + 1;\n"
 210 "    w.y =  3 * x3 - 6 * x2         + 4;\n"
 211 "    w.z = -3 * x3 + 3 * x2 + 3 * x + 1;\n"
 212 "    w.w =  x3;\n"
 213 "    return w / 6.f;\n"
 214 "}\n"
 215 "\n"
 216 "vec4 texture_bicubic(sampler2D sampler, vec2 tex_coords)\n"
 217 "{\n"
 218 "   vec2 tex_size = textureSize(sampler, 0);\n"
 219 "   vec2 inv_tex_size = 1.0 / tex_size;\n"
 220 "\n"
 221 "   tex_coords = tex_coords * tex_size - 0.5;\n"
 222 "\n"
 223 "   vec2 fxy = fract(tex_coords);\n"
 224 "   tex_coords -= fxy;\n"
 225 "\n"
 226 "   vec4 xcubic = cubic(fxy.x);\n"
 227 "   vec4 ycubic = cubic(fxy.y);\n"
 228 "\n"
 229 "   vec4 c = tex_coords.xxyy + vec2 (-0.5, +1.5).xyxy;\n"
 230 "\n"
 231 "   vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);\n"
 232 "   vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;\n"
 233 "\n"
 234 "   offset *= inv_tex_size.xxyy;\n"
 235 "\n"
 236 "   vec4 sample0 = texture(sampler, offset.xz);\n"
 237 "   vec4 sample1 = texture(sampler, offset.yz);\n"
 238 "   vec4 sample2 = texture(sampler, offset.xw);\n"
 239 "   vec4 sample3 = texture(sampler, offset.yw);\n"
 240 "\n"
 241 "   float sx = s.x / (s.x + s.y);\n"
 242 "   float sy = s.z / (s.z + s.w);\n"
 243 "\n"
 244 "   return mix(\n"
 245 "          mix(sample3, sample2, sx), mix(sample1, sample0, sx)\n"
 246 "          , sy);\n"
 247 "}\n"
 248 "\n"
 249 "void main()\n"
 250 "{\n"
 251 "       switch (type) {\n"
 252 "               case 0:\n"
 253 "                       FragColor = border_colour;\n"
 254 "                       break;\n"
 255 "               case 1:\n"
 256 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 257 "                       FragColor.x = pow(FragColor.x, IN_GAMMA) / DCI_COEFFICIENT;\n"
 258 "                       FragColor.y = pow(FragColor.y, IN_GAMMA) / DCI_COEFFICIENT;\n"
 259 "                       FragColor.z = pow(FragColor.z, IN_GAMMA) / DCI_COEFFICIENT;\n"
 260 "                       FragColor = colour_conversion * FragColor;\n"
 261 "                       FragColor.x = pow(FragColor.x, OUT_GAMMA);\n"
 262 "                       FragColor.y = pow(FragColor.y, OUT_GAMMA);\n"
 263 "                       FragColor.z = pow(FragColor.z, OUT_GAMMA);\n"
 264 "                       break;\n"
 265 "               case 2:\n"
 266 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 267 "                       break;\n"
 268 "       }\n"
 269 "}\n";
 270
 271
 272 void
 273 GLVideoView::ensure_context ()
 274 {
 275         if (!_context) {
 276                 wxGLContextAttrs attrs;
 277                 attrs.PlatformDefaults().CoreProfile().OGLVersion(4, 1).EndList();
 278                 _context = new wxGLContext (_canvas, nullptr, &attrs);
 279                 if (!_context->IsOK()) {
 280                         throw GLError ("Making GL context", -1);
 281                 }
 282         }
 283 }
 284
 285
 286 /* Offset of video texture triangles in indices */
 287 static constexpr int indices_video_texture = 0;
 288 /* Offset of subtitle texture triangles in indices */
 289 static constexpr int indices_subtitle_texture = 6;
 290 /* Offset of border lines in indices */
 291 static constexpr int indices_border = 12;
 292
 293 static constexpr unsigned int indices[] = {
 294         0, 1, 3, // video texture triangle #1
 295         1, 2, 3, // video texture triangle #2
 296         4, 5, 7, // subtitle texture triangle #1
 297         5, 6, 7, // subtitle texture triangle #2
 298         8, 9,    // border line #1
 299         9, 10,   // border line #2
 300         10, 11,  // border line #3
 301         11, 8,   // border line #4
 302 };
 303
 304
 305 void
 306 GLVideoView::setup_shaders ()
 307 {
 308         DCPOMATIC_ASSERT (_canvas);
 309         DCPOMATIC_ASSERT (_context);
 310         auto r = _canvas->SetCurrent (*_context);
 311         DCPOMATIC_ASSERT (r);
 312
 313 #ifdef DCPOMATIC_WINDOWS
 314         r = glewInit();
 315         if (r != GLEW_OK) {
 316                 throw GLError(reinterpret_cast<char const*>(glewGetErrorString(r)));
 317         }
 318 #endif
 319
 320         auto get_information = [this](GLenum name) {
 321                 auto s = glGetString (name);
 322                 if (s) {
 323                         _information[name] = std::string (reinterpret_cast<char const *>(s));
 324                 }
 325         };
 326
 327         get_information (GL_VENDOR);
 328         get_information (GL_RENDERER);
 329         get_information (GL_VERSION);
 330         get_information (GL_SHADING_LANGUAGE_VERSION);
 331
 332         glGenVertexArrays(1, &_vao);
 333         check_gl_error ("glGenVertexArrays");
 334         GLuint vbo;
 335         glGenBuffers(1, &vbo);
 336         check_gl_error ("glGenBuffers");
 337         GLuint ebo;
 338         glGenBuffers(1, &ebo);
 339         check_gl_error ("glGenBuffers");
 340
 341         glBindVertexArray(_vao);
 342         check_gl_error ("glBindVertexArray");
 343
 344         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 345         check_gl_error ("glBindBuffer");
 346
 347         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
 348         check_gl_error ("glBindBuffer");
 349         glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
 350         check_gl_error ("glBufferData");
 351
 352         /* position attribute to vertex shader (location = 0) */
 353         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), nullptr);
 354         glEnableVertexAttribArray(0);
 355         /* texture coord attribute to vertex shader (location = 1) */
 356         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), reinterpret_cast<void*>(3 * sizeof(float)));
 357         glEnableVertexAttribArray(1);
 358         check_gl_error ("glEnableVertexAttribArray");
 359
 360         auto compile = [](GLenum type, char const* source) -> GLuint {
 361                 auto shader = glCreateShader(type);
 362                 DCPOMATIC_ASSERT (shader);
 363                 GLchar const * src[] = { static_cast<GLchar const *>(source) };
 364                 glShaderSource(shader, 1, src, nullptr);
 365                 check_gl_error ("glShaderSource");
 366                 glCompileShader(shader);
 367                 check_gl_error ("glCompileShader");
 368                 GLint ok;
 369                 glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
 370                 if (!ok) {
 371                         GLint log_length;
 372                         glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
 373                         string log;
 374                         if (log_length > 0) {
 375                                 char* log_char = new char[log_length];
 376                                 glGetShaderInfoLog(shader, log_length, nullptr, log_char);
 377                                 log = string(log_char);
 378                                 delete[] log_char;
 379                         }
 380                         glDeleteShader(shader);
 381                         throw GLError(String::compose("Could not compile shader (%1)", log).c_str(), -1);
 382                 }
 383                 return shader;
 384         };
 385
 386         auto vertex_shader = compile (GL_VERTEX_SHADER, vertex_source);
 387         auto fragment_shader = compile (GL_FRAGMENT_SHADER, fragment_source);
 388
 389         auto program = glCreateProgram();
 390         check_gl_error ("glCreateProgram");
 391         glAttachShader (program, vertex_shader);
 392         check_gl_error ("glAttachShader");
 393         glAttachShader (program, fragment_shader);
 394         check_gl_error ("glAttachShader");
 395         glLinkProgram (program);
 396         check_gl_error ("glLinkProgram");
 397         GLint ok;
 398         glGetProgramiv (program, GL_LINK_STATUS, &ok);
 399         if (!ok) {
 400                 GLint log_length;
 401                 glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_length);
 402                 string log;
 403                 if (log_length > 0) {
 404                         char* log_char = new char[log_length];
 405                         glGetProgramInfoLog(program, log_length, nullptr, log_char);
 406                         log = string(log_char);
 407                         delete[] log_char;
 408                 }
 409                 glDeleteProgram (program);
 410                 throw GLError(String::compose("Could not link shader (%1)", log).c_str(), -1);
 411         }
 412         glDeleteShader (vertex_shader);
 413         glDeleteShader (fragment_shader);
 414
 415         glUseProgram (program);
 416
 417         _fragment_type = glGetUniformLocation (program, "type");
 418         check_gl_error ("glGetUniformLocation");
 419         set_border_colour (program);
 420
 421         auto conversion = dcp::ColourConversion::rec709_to_xyz();
 422         boost::numeric::ublas::matrix<double> matrix = conversion.xyz_to_rgb ();
 423         GLfloat gl_matrix[] = {
 424                 static_cast<float>(matrix(0, 0)), static_cast<float>(matrix(0, 1)), static_cast<float>(matrix(0, 2)), 0.0f,
 425                 static_cast<float>(matrix(1, 0)), static_cast<float>(matrix(1, 1)), static_cast<float>(matrix(1, 2)), 0.0f,
 426                 static_cast<float>(matrix(2, 0)), static_cast<float>(matrix(2, 1)), static_cast<float>(matrix(2, 2)), 0.0f,
 427                 0.0f, 0.0f, 0.0f, 1.0f
 428                 };
 429
 430         auto colour_conversion = glGetUniformLocation (program, "colour_conversion");
 431         check_gl_error ("glGetUniformLocation");
 432         glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
 433
 434         glLineWidth (2.0f);
 435         glEnable (GL_BLEND);
 436         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 437
 438         /* Reserve space for the GL_ARRAY_BUFFER */
 439         glBufferData(GL_ARRAY_BUFFER, 12 * 5 * sizeof(float), nullptr, GL_STATIC_DRAW);
 440         check_gl_error ("glBufferData");
 441 }
 442
 443
 444 void
 445 GLVideoView::set_border_colour (GLuint program)
 446 {
 447         auto uniform = glGetUniformLocation (program, "border_colour");
 448         check_gl_error ("glGetUniformLocation");
 449         auto colour = outline_content_colour ();
 450         glUniform4f (uniform, colour.Red() / 255.0f, colour.Green() / 255.0f, colour.Blue() / 255.0f, 1.0f);
 451         check_gl_error ("glUniform4f");
 452 }
 453
 454
 455 void
 456 GLVideoView::draw (Position<int>, dcp::Size)
 457 {
 458         auto pad = pad_colour();
 459         glClearColor(pad.Red() / 255.0, pad.Green() / 255.0, pad.Blue() / 255.0, 1.0);
 460         glClear (GL_COLOR_BUFFER_BIT);
 461         check_gl_error ("glClear");
 462
 463         auto const size = _canvas_size.load();
 464         int const width = size.GetWidth();
 465         int const height = size.GetHeight();
 466
 467         if (width < 64 || height < 0) {
 468                 return;
 469         }
 470
 471         glViewport (0, 0, width, height);
 472         check_gl_error ("glViewport");
 473
 474         glBindVertexArray(_vao);
 475         check_gl_error ("glBindVertexArray");
 476         glUniform1i(_fragment_type, _optimise_for_j2k ? 1 : 2);
 477         _video_texture->bind();
 478         glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_video_texture * sizeof(int)));
 479         if (_have_subtitle_to_render) {
 480                 glUniform1i(_fragment_type, 2);
 481                 _subtitle_texture->bind();
 482                 glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_subtitle_texture * sizeof(int)));
 483         }
 484         if (_viewer->outline_content()) {
 485                 glUniform1i(_fragment_type, 0);
 486                 glDrawElements (GL_LINES, 8, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_border * sizeof(int)));
 487                 check_gl_error ("glDrawElements");
 488         }
 489
 490         glFlush();
 491         check_gl_error ("glFlush");
 492
 493         _canvas->SwapBuffers();
 494 }
 495
 496
 497 void
 498 GLVideoView::set_image (shared_ptr<const PlayerVideo> pv)
 499 {
 500         shared_ptr<const Image> video = _optimise_for_j2k ? pv->raw_image() : pv->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), VideoRange::FULL, Image::Alignment::COMPACT, true);
 501
 502         /* Only the player's black frames should be aligned at this stage, so this should
 503          * almost always have no work to do.
 504          */
 505         video = Image::ensure_alignment (video, Image::Alignment::COMPACT);
 506
 507         /** If _optimise_for_j2k is true we render a XYZ image, doing the colourspace
 508          *  conversion, scaling and video range conversion in the GL shader.
 509          *  Othewise we render a RGB image without any shader-side processing.
 510          */
 511
 512         /* XXX: video range conversion */
 513
 514         _video_texture->set (video);
 515
 516         auto const text = pv->text();
 517         _have_subtitle_to_render = static_cast<bool>(text) && _optimise_for_j2k;
 518         if (_have_subtitle_to_render) {
 519                 /* opt: only do this if it's a new subtitle? */
 520                 DCPOMATIC_ASSERT (text->image->alignment() == Image::Alignment::COMPACT);
 521                 _subtitle_texture->set (text->image);
 522         }
 523
 524
 525         auto const canvas_size = _canvas_size.load();
 526         int const canvas_width = canvas_size.GetWidth();
 527         int const canvas_height = canvas_size.GetHeight();
 528         auto inter_position = player_video().first->inter_position();
 529         auto inter_size = player_video().first->inter_size();
 530         auto out_size = player_video().first->out_size();
 531
 532         _last_canvas_size.set_next (canvas_size);
 533         _last_video_size.set_next (video->size());
 534         _last_inter_position.set_next (inter_position);
 535         _last_inter_size.set_next (inter_size);
 536         _last_out_size.set_next (out_size);
 537
 538         auto x_pixels_to_gl = [canvas_width](int x) {
 539                 return (x * 2.0f / canvas_width) - 1.0f;
 540         };
 541
 542         auto y_pixels_to_gl = [canvas_height](int y) {
 543                 return (y * 2.0f / canvas_height) - 1.0f;
 544         };
 545
 546         if (_last_canvas_size.changed() || _last_inter_position.changed() || _last_inter_size.changed() || _last_out_size.changed()) {
 547                 float const video_x1 = x_pixels_to_gl(_optimise_for_j2k ? inter_position.x : 0);
 548                 float const video_x2 = x_pixels_to_gl(_optimise_for_j2k ? (inter_position.x + inter_size.width) : out_size.width);
 549                 float const video_y1 = y_pixels_to_gl(_optimise_for_j2k ? inter_position.y : 0);
 550                 float const video_y2 = y_pixels_to_gl(_optimise_for_j2k ? (inter_position.y + inter_size.height) : out_size.height);
 551                 float video_vertices[] = {
 552                          // positions              // texture coords
 553                         video_x2, video_y2, 0.0f,  1.0f, 0.0f,   // video texture top right       (index 0)
 554                         video_x2, video_y1, 0.0f,  1.0f, 1.0f,   // video texture bottom right    (index 1)
 555                         video_x1, video_y1, 0.0f,  0.0f, 1.0f,   // video texture bottom left     (index 2)
 556                         video_x1, video_y2, 0.0f,  0.0f, 0.0f,   // video texture top left        (index 3)
 557                 };
 558
 559                 glBufferSubData (GL_ARRAY_BUFFER, 0, sizeof(video_vertices), video_vertices);
 560                 check_gl_error ("glBufferSubData (video)");
 561
 562                 float const border_x1 = x_pixels_to_gl(inter_position.x);
 563                 float const border_y1 = y_pixels_to_gl(inter_position.y);
 564                 float const border_x2 = x_pixels_to_gl(inter_position.x + inter_size.width);
 565                 float const border_y2 = y_pixels_to_gl(inter_position.y + inter_size.height);
 566
 567                 float border_vertices[] = {
 568                          // positions                 // texture coords
 569                          border_x1, border_y1, 0.0f,  0.0f, 0.0f,   // border bottom left         (index 4)
 570                          border_x1, border_y2, 0.0f,  0.0f, 0.0f,   // border top left            (index 5)
 571                          border_x2, border_y2, 0.0f,  0.0f, 0.0f,   // border top right           (index 6)
 572                          border_x2, border_y1, 0.0f,  0.0f, 0.0f,   // border bottom right        (index 7)
 573                 };
 574
 575                 glBufferSubData (GL_ARRAY_BUFFER, 8 * 5 * sizeof(float), sizeof(border_vertices), border_vertices);
 576                 check_gl_error ("glBufferSubData (border)");
 577         }
 578
 579         if (_have_subtitle_to_render) {
 580                 float const subtitle_x1 = x_pixels_to_gl(inter_position.x + text->position.x);
 581                 float const subtitle_x2 = x_pixels_to_gl(inter_position.x + text->position.x + text->image->size().width);
 582                 float const subtitle_y1 = y_pixels_to_gl(inter_position.y + text->position.y + text->image->size().height);
 583                 float const subtitle_y2 = y_pixels_to_gl(inter_position.y + text->position.y);
 584
 585                 float vertices[] = {
 586                          // positions                     // texture coords
 587                          subtitle_x2, subtitle_y1, 0.0f,  1.0f, 0.0f,   // subtitle texture top right    (index 4)
 588                          subtitle_x2, subtitle_y2, 0.0f,  1.0f, 1.0f,   // subtitle texture bottom right (index 5)
 589                          subtitle_x1, subtitle_y2, 0.0f,  0.0f, 1.0f,   // subtitle texture bottom left  (index 6)
 590                          subtitle_x1, subtitle_y1, 0.0f,  0.0f, 0.0f,   // subtitle texture top left     (index 7)
 591                 };
 592
 593                 glBufferSubData (GL_ARRAY_BUFFER, 4 * 5 * sizeof(float), sizeof(vertices), vertices);
 594                 check_gl_error ("glBufferSubData (subtitle)");
 595         }
 596
 597         /* opt: where should these go? */
 598
 599         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 600         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 601         check_gl_error ("glTexParameteri");
 602
 603         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 604         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 605         check_gl_error ("glTexParameterf");
 606 }
 607
 608
 609 void
 610 GLVideoView::start ()
 611 {
 612         VideoView::start ();
 613
 614         boost::mutex::scoped_lock lm (_playing_mutex);
 615         _playing = true;
 616         _thread_work_condition.notify_all ();
 617 }
 618
 619 void
 620 GLVideoView::stop ()
 621 {
 622         boost::mutex::scoped_lock lm (_playing_mutex);
 623         _playing = false;
 624 }
 625
 626
 627 void
 628 GLVideoView::thread_playing ()
 629 {
 630         if (length() != dcpomatic::DCPTime()) {
 631                 auto const next = position() + one_video_frame();
 632
 633                 if (next >= length()) {
 634                         _viewer->finished ();
 635                         return;
 636                 }
 637
 638                 get_next_frame (false);
 639                 set_image_and_draw ();
 640         }
 641
 642         while (true) {
 643                 optional<int> n = time_until_next_frame();
 644                 if (!n || *n > 5) {
 645                         break;
 646                 }
 647                 get_next_frame (true);
 648                 add_dropped ();
 649         }
 650 }
 651
 652
 653 void
 654 GLVideoView::set_image_and_draw ()
 655 {
 656         auto pv = player_video().first;
 657         if (pv) {
 658                 set_image (pv);
 659                 draw (pv->inter_position(), pv->inter_size());
 660                 _viewer->image_changed (pv);
 661         }
 662 }
 663
 664
 665 void
 666 GLVideoView::thread ()
 667 try
 668 {
 669         start_of_thread ("GLVideoView");
 670
 671 #if defined(DCPOMATIC_OSX)
 672         /* Without this we see errors like
 673          * ../src/osx/cocoa/glcanvas.mm(194): assert ""context"" failed in SwapBuffers(): should have current context [in thread 700006970000]
 674          */
 675         WXGLSetCurrentContext (_context->GetWXGLContext());
 676 #else
 677         if (!_setup_shaders_done) {
 678                 setup_shaders ();
 679                 _setup_shaders_done = true;
 680         }
 681 #endif
 682
 683 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
 684         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
 685                 /* Enable vsync */
 686                 Display* dpy = wxGetX11Display();
 687                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
 688                 _vsync_enabled = true;
 689         }
 690 #endif
 691
 692 #ifdef DCPOMATIC_WINDOWS
 693         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
 694                 /* Enable vsync */
 695                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
 696                 if (swap) {
 697                         swap (1);
 698                         _vsync_enabled = true;
 699                 }
 700         }
 701
 702 #endif
 703
 704 #ifdef DCPOMATIC_OSX
 705         /* Enable vsync */
 706         GLint swapInterval = 1;
 707         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
 708         _vsync_enabled = true;
 709 #endif
 710
 711         _video_texture.reset(new Texture(_optimise_for_j2k ? 2 : 1));
 712         _subtitle_texture.reset(new Texture(1));
 713
 714         while (true) {
 715                 boost::mutex::scoped_lock lm (_playing_mutex);
 716                 while (!_playing && !_one_shot) {
 717                         _thread_work_condition.wait (lm);
 718                 }
 719                 lm.unlock ();
 720
 721                 if (_playing) {
 722                         thread_playing ();
 723                 } else if (_one_shot) {
 724                         _one_shot = false;
 725                         set_image_and_draw ();
 726                 }
 727
 728                 boost::this_thread::interruption_point ();
 729                 dcpomatic_sleep_milliseconds (time_until_next_frame().get_value_or(0));
 730         }
 731
 732         /* XXX: leaks _context, but that seems preferable to deleting it here
 733          * without also deleting the wxGLCanvas.
 734          */
 735 }
 736 catch (...)
 737 {
 738         store_current ();
 739 }
 740
 741
 742 VideoView::NextFrameResult
 743 GLVideoView::display_next_frame (bool non_blocking)
 744 {
 745         NextFrameResult const r = get_next_frame (non_blocking);
 746         request_one_shot ();
 747         return r;
 748 }
 749
 750
 751 void
 752 GLVideoView::request_one_shot ()
 753 {
 754         boost::mutex::scoped_lock lm (_playing_mutex);
 755         _one_shot = true;
 756         _thread_work_condition.notify_all ();
 757 }
 758
 759
 760 Texture::Texture (GLint unpack_alignment)
 761         : _unpack_alignment (unpack_alignment)
 762 {
 763         glGenTextures (1, &_name);
 764         check_gl_error ("glGenTextures");
 765 }
 766
 767
 768 Texture::~Texture ()
 769 {
 770         glDeleteTextures (1, &_name);
 771 }
 772
 773
 774 void
 775 Texture::bind ()
 776 {
 777         glBindTexture(GL_TEXTURE_2D, _name);
 778         check_gl_error ("glBindTexture");
 779 }
 780
 781
 782 void
 783 Texture::set (shared_ptr<const Image> image)
 784 {
 785         auto const create = !_size || image->size() != _size;
 786         _size = image->size();
 787
 788         glPixelStorei (GL_UNPACK_ALIGNMENT, _unpack_alignment);
 789         check_gl_error ("glPixelStorei");
 790
 791         DCPOMATIC_ASSERT (image->alignment() == Image::Alignment::COMPACT);
 792
 793         GLint internal_format;
 794         GLenum format;
 795         GLenum type;
 796
 797         switch (image->pixel_format()) {
 798         case AV_PIX_FMT_BGRA:
 799                 internal_format = GL_RGBA8;
 800                 format = GL_BGRA;
 801                 type = GL_UNSIGNED_BYTE;
 802                 break;
 803         case AV_PIX_FMT_RGBA:
 804                 internal_format = GL_RGBA8;
 805                 format = GL_RGBA;
 806                 type = GL_UNSIGNED_BYTE;
 807                 break;
 808         case AV_PIX_FMT_RGB24:
 809                 internal_format = GL_RGBA8;
 810                 format = GL_RGB;
 811                 type = GL_UNSIGNED_BYTE;
 812                 break;
 813         case AV_PIX_FMT_XYZ12:
 814                 internal_format = GL_RGBA12;
 815                 format = GL_RGB;
 816                 type = GL_UNSIGNED_SHORT;
 817                 break;
 818         default:
 819                 throw PixelFormatError ("Texture::set", image->pixel_format());
 820         }
 821
 822         bind ();
 823
 824         if (create) {
 825                 glTexImage2D (GL_TEXTURE_2D, 0, internal_format, _size->width, _size->height, 0, format, type, image->data()[0]);
 826                 check_gl_error ("glTexImage2D");
 827         } else {
 828                 glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, _size->width, _size->height, format, type, image->data()[0]);
 829                 check_gl_error ("glTexSubImage2D");
 830         }
 831 }
 832