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
  28 /* This will only build on an new-enough wxWidgets: see the comment in gl_video_view.h */
  29 #if wxCHECK_VERSION(3,1,0)
  30
  31 #include "film_viewer.h"
  32 #include "wx_util.h"
  33 #include "lib/image.h"
  34 #include "lib/dcpomatic_assert.h"
  35 #include "lib/exceptions.h"
  36 #include "lib/cross.h"
  37 #include "lib/player_video.h"
  38 #include "lib/butler.h"
  39 #include <boost/bind/bind.hpp>
  40 #include <iostream>
  41
  42 #ifdef DCPOMATIC_OSX
  43 #define GL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED
  44 #include <OpenGL/OpenGL.h>
  45 #include <OpenGL/gl3.h>
  46 #endif
  47
  48 #ifdef DCPOMATIC_LINUX
  49 #include <GL/glu.h>
  50 #include <GL/glext.h>
  51 #endif
  52
  53 #ifdef DCPOMATIC_WINDOWS
  54 #include <GL/glu.h>
  55 #include <GL/wglext.h>
  56 #endif
  57
  58
  59 using std::cout;
  60 using std::shared_ptr;
  61 using std::string;
  62 using boost::optional;
  63 #if BOOST_VERSION >= 106100
  64 using namespace boost::placeholders;
  65 #endif
  66
  67
  68 static void
  69 check_gl_error (char const * last)
  70 {
  71         GLenum const e = glGetError ();
  72         if (e != GL_NO_ERROR) {
  73                 throw GLError (last, e);
  74         }
  75 }
  76
  77
  78 GLVideoView::GLVideoView (FilmViewer* viewer, wxWindow *parent)
  79         : VideoView (viewer)
  80         , _context (nullptr)
  81         , _vsync_enabled (false)
  82         , _playing (false)
  83         , _one_shot (false)
  84 {
  85         wxGLAttributes attributes;
  86         /* We don't need a depth buffer, and indeed there is apparently a bug with Windows/Intel HD 630
  87          * which puts green lines over the OpenGL display if you have a non-zero depth buffer size.
  88          * https://community.intel.com/t5/Graphics/Request-for-details-on-Intel-HD-630-green-lines-in-OpenGL-apps/m-p/1202179
  89          */
  90         attributes.PlatformDefaults().MinRGBA(8, 8, 8, 8).DoubleBuffer().Depth(0).EndList();
  91         _canvas = new wxGLCanvas (
  92                 parent, attributes, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE
  93         );
  94         _canvas->Bind (wxEVT_PAINT, boost::bind(&GLVideoView::update, this));
  95         _canvas->Bind (wxEVT_SIZE, boost::bind(&GLVideoView::size_changed, this, _1));
  96
  97         _canvas->Bind (wxEVT_TIMER, boost::bind(&GLVideoView::check_for_butler_errors, this));
  98         _timer.reset (new wxTimer(_canvas));
  99         _timer->Start (2000);
 100 }
 101
 102
 103 void
 104 GLVideoView::size_changed (wxSizeEvent const& ev)
 105 {
 106         _canvas_size = ev.GetSize ();
 107         Sized ();
 108 }
 109
 110
 111
 112 GLVideoView::~GLVideoView ()
 113 {
 114         boost::this_thread::disable_interruption dis;
 115
 116         try {
 117                 _thread.interrupt ();
 118                 _thread.join ();
 119         } catch (...) {}
 120 }
 121
 122 void
 123 GLVideoView::check_for_butler_errors ()
 124 {
 125         if (!_viewer->butler()) {
 126                 return;
 127         }
 128
 129         try {
 130                 _viewer->butler()->rethrow ();
 131         } catch (DecodeError& e) {
 132                 error_dialog (get(), e.what());
 133         } catch (dcp::ReadError& e) {
 134                 error_dialog (get(), wxString::Format(_("Could not read DCP: %s"), std_to_wx(e.what())));
 135         }
 136 }
 137
 138
 139 /** Called from the UI thread */
 140 void
 141 GLVideoView::update ()
 142 {
 143         if (!_canvas->IsShownOnScreen()) {
 144                 return;
 145         }
 146
 147         /* It appears important to do this from the GUI thread; if we do it from the GL thread
 148          * on Linux we get strange failures to create the context for any version of GL higher
 149          * than 3.2.
 150          */
 151         ensure_context ();
 152
 153 #ifdef DCPOMATIC_OSX
 154         /* macOS gives errors if we don't do this (and therefore [NSOpenGLContext setView:]) from the main thread */
 155         if (!_setup_shaders_done) {
 156                 setup_shaders ();
 157                 _setup_shaders_done = true;
 158         }
 159 #endif
 160
 161         if (!_thread.joinable()) {
 162                 _thread = boost::thread (boost::bind(&GLVideoView::thread, this));
 163         }
 164
 165         request_one_shot ();
 166
 167         rethrow ();
 168 }
 169
 170
 171 static constexpr char vertex_source[] =
 172 "#version 330 core\n"
 173 "\n"
 174 "layout (location = 0) in vec3 in_pos;\n"
 175 "layout (location = 1) in vec2 in_tex_coord;\n"
 176 "\n"
 177 "out vec2 TexCoord;\n"
 178 "\n"
 179 "void main()\n"
 180 "{\n"
 181 "       gl_Position = vec4(in_pos, 1.0);\n"
 182 "       TexCoord = in_tex_coord;\n"
 183 "}\n";
 184
 185
 186 /* Bicubic interpolation stolen from https://stackoverflow.com/questions/13501081/efficient-bicubic-filtering-code-in-glsl */
 187 static constexpr char fragment_source[] =
 188 "#version 330 core\n"
 189 "\n"
 190 "in vec2 TexCoord;\n"
 191 "\n"
 192 "uniform sampler2D texture_sampler;\n"
 193 /* type = 0: draw border
 194  * type = 1: draw XYZ image
 195  * type = 2: draw RGB image
 196  */
 197 "uniform int type = 0;\n"
 198 "uniform vec4 border_colour;\n"
 199 "uniform mat4 colour_conversion;\n"
 200 "\n"
 201 "out vec4 FragColor;\n"
 202 "\n"
 203 "vec4 cubic(float x)\n"
 204 "\n"
 205 "#define IN_GAMMA 2.2\n"
 206 "#define OUT_GAMMA 0.384615385\n"       //  1 /  2.6
 207 "#define DCI_COEFFICIENT 0.91655528\n"  // 48 / 53.37
 208 "\n"
 209 "{\n"
 210 "    float x2 = x * x;\n"
 211 "    float x3 = x2 * x;\n"
 212 "    vec4 w;\n"
 213 "    w.x =     -x3 + 3 * x2 - 3 * x + 1;\n"
 214 "    w.y =  3 * x3 - 6 * x2         + 4;\n"
 215 "    w.z = -3 * x3 + 3 * x2 + 3 * x + 1;\n"
 216 "    w.w =  x3;\n"
 217 "    return w / 6.f;\n"
 218 "}\n"
 219 "\n"
 220 "vec4 texture_bicubic(sampler2D sampler, vec2 tex_coords)\n"
 221 "{\n"
 222 "   vec2 tex_size = textureSize(sampler, 0);\n"
 223 "   vec2 inv_tex_size = 1.0 / tex_size;\n"
 224 "\n"
 225 "   tex_coords = tex_coords * tex_size - 0.5;\n"
 226 "\n"
 227 "   vec2 fxy = fract(tex_coords);\n"
 228 "   tex_coords -= fxy;\n"
 229 "\n"
 230 "   vec4 xcubic = cubic(fxy.x);\n"
 231 "   vec4 ycubic = cubic(fxy.y);\n"
 232 "\n"
 233 "   vec4 c = tex_coords.xxyy + vec2 (-0.5, +1.5).xyxy;\n"
 234 "\n"
 235 "   vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);\n"
 236 "   vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;\n"
 237 "\n"
 238 "   offset *= inv_tex_size.xxyy;\n"
 239 "\n"
 240 "   vec4 sample0 = texture(sampler, offset.xz);\n"
 241 "   vec4 sample1 = texture(sampler, offset.yz);\n"
 242 "   vec4 sample2 = texture(sampler, offset.xw);\n"
 243 "   vec4 sample3 = texture(sampler, offset.yw);\n"
 244 "\n"
 245 "   float sx = s.x / (s.x + s.y);\n"
 246 "   float sy = s.z / (s.z + s.w);\n"
 247 "\n"
 248 "   return mix(\n"
 249 "          mix(sample3, sample2, sx), mix(sample1, sample0, sx)\n"
 250 "          , sy);\n"
 251 "}\n"
 252 "\n"
 253 "void main()\n"
 254 "{\n"
 255 "       switch (type) {\n"
 256 "               case 0:\n"
 257 "                       FragColor = border_colour;\n"
 258 "                       break;\n"
 259 "               case 1:\n"
 260 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 261 "                       FragColor.x = pow(FragColor.x, IN_GAMMA) / DCI_COEFFICIENT;\n"
 262 "                       FragColor.y = pow(FragColor.y, IN_GAMMA) / DCI_COEFFICIENT;\n"
 263 "                       FragColor.z = pow(FragColor.z, IN_GAMMA) / DCI_COEFFICIENT;\n"
 264 "                       FragColor = colour_conversion * FragColor;\n"
 265 "                       FragColor.x = pow(FragColor.x, OUT_GAMMA);\n"
 266 "                       FragColor.y = pow(FragColor.y, OUT_GAMMA);\n"
 267 "                       FragColor.z = pow(FragColor.z, OUT_GAMMA);\n"
 268 "                       break;\n"
 269 "               case 2:\n"
 270 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 271 "                       break;\n"
 272 "       }\n"
 273 "}\n";
 274
 275
 276 void
 277 GLVideoView::ensure_context ()
 278 {
 279         if (!_context) {
 280                 wxGLContextAttrs attrs;
 281                 attrs.PlatformDefaults().CoreProfile().OGLVersion(4, 1).EndList();
 282                 _context = new wxGLContext (_canvas, nullptr, &attrs);
 283                 if (!_context->IsOK()) {
 284                         throw GLError ("Making GL context", -1);
 285                 }
 286         }
 287 }
 288
 289
 290 /* Offset of video texture triangles in indices */
 291 static constexpr int indices_video_texture = 0;
 292 /* Offset of subtitle texture triangles in indices */
 293 static constexpr int indices_subtitle_texture = 6;
 294 /* Offset of border lines in indices */
 295 static constexpr int indices_border = 12;
 296
 297 static constexpr unsigned int indices[] = {
 298         0, 1, 3, // video texture triangle #1
 299         1, 2, 3, // video texture triangle #2
 300         4, 5, 7, // subtitle texture triangle #1
 301         5, 6, 7, // subtitle texture triangle #2
 302         8, 9,    // border line #1
 303         9, 10,   // border line #2
 304         10, 11,  // border line #3
 305         11, 8,   // border line #4
 306 };
 307
 308
 309 void
 310 GLVideoView::setup_shaders ()
 311 {
 312         DCPOMATIC_ASSERT (_canvas);
 313         DCPOMATIC_ASSERT (_context);
 314         auto r = _canvas->SetCurrent (*_context);
 315         DCPOMATIC_ASSERT (r);
 316
 317 #ifdef DCPOMATIC_WINDOWS
 318         r = glewInit();
 319         if (r != GLEW_OK) {
 320                 throw GLError(reinterpret_cast<char const*>(glewGetErrorString(r)));
 321         }
 322 #endif
 323
 324         auto get_information = [this](GLenum name) {
 325                 auto s = glGetString (name);
 326                 if (s) {
 327                         _information[name] = std::string (reinterpret_cast<char const *>(s));
 328                 }
 329         };
 330
 331         get_information (GL_VENDOR);
 332         get_information (GL_RENDERER);
 333         get_information (GL_VERSION);
 334         get_information (GL_SHADING_LANGUAGE_VERSION);
 335
 336         glGenVertexArrays(1, &_vao);
 337         check_gl_error ("glGenVertexArrays");
 338         GLuint vbo;
 339         glGenBuffers(1, &vbo);
 340         check_gl_error ("glGenBuffers");
 341         GLuint ebo;
 342         glGenBuffers(1, &ebo);
 343         check_gl_error ("glGenBuffers");
 344
 345         glBindVertexArray(_vao);
 346         check_gl_error ("glBindVertexArray");
 347
 348         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 349         check_gl_error ("glBindBuffer");
 350
 351         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
 352         check_gl_error ("glBindBuffer");
 353         glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
 354         check_gl_error ("glBufferData");
 355
 356         /* position attribute to vertex shader (location = 0) */
 357         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), nullptr);
 358         glEnableVertexAttribArray(0);
 359         /* texture coord attribute to vertex shader (location = 1) */
 360         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), reinterpret_cast<void*>(3 * sizeof(float)));
 361         glEnableVertexAttribArray(1);
 362         check_gl_error ("glEnableVertexAttribArray");
 363
 364         auto compile = [](GLenum type, char const* source) -> GLuint {
 365                 auto shader = glCreateShader(type);
 366                 DCPOMATIC_ASSERT (shader);
 367                 GLchar const * src[] = { static_cast<GLchar const *>(source) };
 368                 glShaderSource(shader, 1, src, nullptr);
 369                 check_gl_error ("glShaderSource");
 370                 glCompileShader(shader);
 371                 check_gl_error ("glCompileShader");
 372                 GLint ok;
 373                 glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
 374                 if (!ok) {
 375                         GLint log_length;
 376                         glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
 377                         string log;
 378                         if (log_length > 0) {
 379                                 char* log_char = new char[log_length];
 380                                 glGetShaderInfoLog(shader, log_length, nullptr, log_char);
 381                                 log = string(log_char);
 382                                 delete[] log_char;
 383                         }
 384                         glDeleteShader(shader);
 385                         throw GLError(String::compose("Could not compile shader (%1)", log).c_str(), -1);
 386                 }
 387                 return shader;
 388         };
 389
 390         auto vertex_shader = compile (GL_VERTEX_SHADER, vertex_source);
 391         auto fragment_shader = compile (GL_FRAGMENT_SHADER, fragment_source);
 392
 393         auto program = glCreateProgram();
 394         check_gl_error ("glCreateProgram");
 395         glAttachShader (program, vertex_shader);
 396         check_gl_error ("glAttachShader");
 397         glAttachShader (program, fragment_shader);
 398         check_gl_error ("glAttachShader");
 399         glLinkProgram (program);
 400         check_gl_error ("glLinkProgram");
 401         GLint ok;
 402         glGetProgramiv (program, GL_LINK_STATUS, &ok);
 403         if (!ok) {
 404                 GLint log_length;
 405                 glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_length);
 406                 string log;
 407                 if (log_length > 0) {
 408                         char* log_char = new char[log_length];
 409                         glGetProgramInfoLog(program, log_length, nullptr, log_char);
 410                         log = string(log_char);
 411                         delete[] log_char;
 412                 }
 413                 glDeleteProgram (program);
 414                 throw GLError(String::compose("Could not link shader (%1)", log).c_str(), -1);
 415         }
 416         glDeleteShader (vertex_shader);
 417         glDeleteShader (fragment_shader);
 418
 419         glUseProgram (program);
 420
 421         _fragment_type = glGetUniformLocation (program, "type");
 422         check_gl_error ("glGetUniformLocation");
 423         set_border_colour (program);
 424
 425         auto conversion = dcp::ColourConversion::rec709_to_xyz();
 426         boost::numeric::ublas::matrix<double> matrix = conversion.xyz_to_rgb ();
 427         GLfloat gl_matrix[] = {
 428                 static_cast<float>(matrix(0, 0)), static_cast<float>(matrix(0, 1)), static_cast<float>(matrix(0, 2)), 0.0f,
 429                 static_cast<float>(matrix(1, 0)), static_cast<float>(matrix(1, 1)), static_cast<float>(matrix(1, 2)), 0.0f,
 430                 static_cast<float>(matrix(2, 0)), static_cast<float>(matrix(2, 1)), static_cast<float>(matrix(2, 2)), 0.0f,
 431                 0.0f, 0.0f, 0.0f, 1.0f
 432                 };
 433
 434         auto colour_conversion = glGetUniformLocation (program, "colour_conversion");
 435         check_gl_error ("glGetUniformLocation");
 436         glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
 437
 438         glLineWidth (2.0f);
 439         glEnable (GL_BLEND);
 440         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 441
 442         /* Reserve space for the GL_ARRAY_BUFFER */
 443         glBufferData(GL_ARRAY_BUFFER, 12 * 5 * sizeof(float), nullptr, GL_STATIC_DRAW);
 444         check_gl_error ("glBufferData");
 445 }
 446
 447
 448 void
 449 GLVideoView::set_border_colour (GLuint program)
 450 {
 451         auto uniform = glGetUniformLocation (program, "border_colour");
 452         check_gl_error ("glGetUniformLocation");
 453         auto colour = outline_content_colour ();
 454         glUniform4f (uniform, colour.Red() / 255.0f, colour.Green() / 255.0f, colour.Blue() / 255.0f, 1.0f);
 455         check_gl_error ("glUniform4f");
 456 }
 457
 458
 459 void
 460 GLVideoView::draw (Position<int>, dcp::Size)
 461 {
 462         auto pad = pad_colour();
 463         glClearColor(pad.Red() / 255.0, pad.Green() / 255.0, pad.Blue() / 255.0, 1.0);
 464         glClear (GL_COLOR_BUFFER_BIT);
 465         check_gl_error ("glClear");
 466
 467         auto const size = _canvas_size.load();
 468         int const width = size.GetWidth();
 469         int const height = size.GetHeight();
 470
 471         if (width < 64 || height < 0) {
 472                 return;
 473         }
 474
 475         glViewport (0, 0, width, height);
 476         check_gl_error ("glViewport");
 477
 478         glBindVertexArray(_vao);
 479         check_gl_error ("glBindVertexArray");
 480         glUniform1i(_fragment_type, _optimise_for_j2k ? 1 : 2);
 481         _video_texture->bind();
 482         glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_video_texture * sizeof(int)));
 483         if (_have_subtitle_to_render) {
 484                 glUniform1i(_fragment_type, 2);
 485                 _subtitle_texture->bind();
 486                 glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_subtitle_texture * sizeof(int)));
 487         }
 488         if (_viewer->outline_content()) {
 489                 glUniform1i(_fragment_type, 0);
 490                 glDrawElements (GL_LINES, 8, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_border * sizeof(int)));
 491                 check_gl_error ("glDrawElements");
 492         }
 493
 494         glFlush();
 495         check_gl_error ("glFlush");
 496
 497         _canvas->SwapBuffers();
 498 }
 499
 500
 501 void
 502 GLVideoView::set_image (shared_ptr<const PlayerVideo> pv)
 503 {
 504         shared_ptr<const Image> video = _optimise_for_j2k ? pv->raw_image() : pv->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), VideoRange::FULL, true);
 505
 506         /* Only the player's black frames should be aligned at this stage, so this should
 507          * almost always have no work to do.
 508          */
 509         video = Image::ensure_alignment (video, Image::Alignment::COMPACT);
 510
 511         /** If _optimise_for_j2k is true we render a XYZ image, doing the colourspace
 512          *  conversion, scaling and video range conversion in the GL shader.
 513          *  Othewise we render a RGB image without any shader-side processing.
 514          */
 515
 516         /* XXX: video range conversion */
 517
 518         _video_texture->set (video);
 519
 520         auto const text = pv->text();
 521         _have_subtitle_to_render = static_cast<bool>(text) && _optimise_for_j2k;
 522         if (_have_subtitle_to_render) {
 523                 /* opt: only do this if it's a new subtitle? */
 524                 DCPOMATIC_ASSERT (text->image->alignment() == Image::Alignment::COMPACT);
 525                 _subtitle_texture->set (text->image);
 526         }
 527
 528
 529         auto const canvas_size = _canvas_size.load();
 530         int const canvas_width = canvas_size.GetWidth();
 531         int const canvas_height = canvas_size.GetHeight();
 532         auto inter_position = player_video().first->inter_position();
 533         auto inter_size = player_video().first->inter_size();
 534         auto out_size = player_video().first->out_size();
 535
 536         _last_canvas_size.set_next (canvas_size);
 537         _last_video_size.set_next (video->size());
 538         _last_inter_position.set_next (inter_position);
 539         _last_inter_size.set_next (inter_size);
 540         _last_out_size.set_next (out_size);
 541
 542         auto x_pixels_to_gl = [canvas_width](int x) {
 543                 return (x * 2.0f / canvas_width) - 1.0f;
 544         };
 545
 546         auto y_pixels_to_gl = [canvas_height](int y) {
 547                 return (y * 2.0f / canvas_height) - 1.0f;
 548         };
 549
 550         if (_last_canvas_size.changed() || _last_inter_position.changed() || _last_inter_size.changed() || _last_out_size.changed()) {
 551                 float const video_x1 = x_pixels_to_gl(_optimise_for_j2k ? inter_position.x : 0);
 552                 float const video_x2 = x_pixels_to_gl(_optimise_for_j2k ? (inter_position.x + inter_size.width) : out_size.width);
 553                 float const video_y1 = y_pixels_to_gl(_optimise_for_j2k ? inter_position.y : 0);
 554                 float const video_y2 = y_pixels_to_gl(_optimise_for_j2k ? (inter_position.y + inter_size.height) : out_size.height);
 555                 float video_vertices[] = {
 556                          // positions              // texture coords
 557                         video_x2, video_y2, 0.0f,  1.0f, 0.0f,   // video texture top right       (index 0)
 558                         video_x2, video_y1, 0.0f,  1.0f, 1.0f,   // video texture bottom right    (index 1)
 559                         video_x1, video_y1, 0.0f,  0.0f, 1.0f,   // video texture bottom left     (index 2)
 560                         video_x1, video_y2, 0.0f,  0.0f, 0.0f,   // video texture top left        (index 3)
 561                 };
 562
 563                 glBufferSubData (GL_ARRAY_BUFFER, 0, sizeof(video_vertices), video_vertices);
 564                 check_gl_error ("glBufferSubData (video)");
 565
 566                 float const border_x1 = x_pixels_to_gl(inter_position.x);
 567                 float const border_y1 = y_pixels_to_gl(inter_position.y);
 568                 float const border_x2 = x_pixels_to_gl(inter_position.x + inter_size.width);
 569                 float const border_y2 = y_pixels_to_gl(inter_position.y + inter_size.height);
 570
 571                 float border_vertices[] = {
 572                          // positions                 // texture coords
 573                          border_x1, border_y1, 0.0f,  0.0f, 0.0f,   // border bottom left         (index 4)
 574                          border_x1, border_y2, 0.0f,  0.0f, 0.0f,   // border top left            (index 5)
 575                          border_x2, border_y2, 0.0f,  0.0f, 0.0f,   // border top right           (index 6)
 576                          border_x2, border_y1, 0.0f,  0.0f, 0.0f,   // border bottom right        (index 7)
 577                 };
 578
 579                 glBufferSubData (GL_ARRAY_BUFFER, 8 * 5 * sizeof(float), sizeof(border_vertices), border_vertices);
 580                 check_gl_error ("glBufferSubData (border)");
 581         }
 582
 583         if (_have_subtitle_to_render) {
 584                 float const subtitle_x1 = x_pixels_to_gl(inter_position.x + text->position.x);
 585                 float const subtitle_x2 = x_pixels_to_gl(inter_position.x + text->position.x + text->image->size().width);
 586                 float const subtitle_y1 = y_pixels_to_gl(inter_position.y + text->position.y + text->image->size().height);
 587                 float const subtitle_y2 = y_pixels_to_gl(inter_position.y + text->position.y);
 588
 589                 float vertices[] = {
 590                          // positions                     // texture coords
 591                          subtitle_x2, subtitle_y1, 0.0f,  1.0f, 0.0f,   // subtitle texture top right    (index 4)
 592                          subtitle_x2, subtitle_y2, 0.0f,  1.0f, 1.0f,   // subtitle texture bottom right (index 5)
 593                          subtitle_x1, subtitle_y2, 0.0f,  0.0f, 1.0f,   // subtitle texture bottom left  (index 6)
 594                          subtitle_x1, subtitle_y1, 0.0f,  0.0f, 0.0f,   // subtitle texture top left     (index 7)
 595                 };
 596
 597                 glBufferSubData (GL_ARRAY_BUFFER, 4 * 5 * sizeof(float), sizeof(vertices), vertices);
 598                 check_gl_error ("glBufferSubData (subtitle)");
 599         }
 600
 601         /* opt: where should these go? */
 602
 603         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 604         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 605         check_gl_error ("glTexParameteri");
 606
 607         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 608         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 609         check_gl_error ("glTexParameterf");
 610 }
 611
 612
 613 void
 614 GLVideoView::start ()
 615 {
 616         VideoView::start ();
 617
 618         boost::mutex::scoped_lock lm (_playing_mutex);
 619         _playing = true;
 620         _thread_work_condition.notify_all ();
 621 }
 622
 623 void
 624 GLVideoView::stop ()
 625 {
 626         boost::mutex::scoped_lock lm (_playing_mutex);
 627         _playing = false;
 628 }
 629
 630
 631 void
 632 GLVideoView::thread_playing ()
 633 {
 634         if (length() != dcpomatic::DCPTime()) {
 635                 auto const next = position() + one_video_frame();
 636
 637                 if (next >= length()) {
 638                         _viewer->finished ();
 639                         return;
 640                 }
 641
 642                 get_next_frame (false);
 643                 set_image_and_draw ();
 644         }
 645
 646         while (true) {
 647                 optional<int> n = time_until_next_frame();
 648                 if (!n || *n > 5) {
 649                         break;
 650                 }
 651                 get_next_frame (true);
 652                 add_dropped ();
 653         }
 654 }
 655
 656
 657 void
 658 GLVideoView::set_image_and_draw ()
 659 {
 660         auto pv = player_video().first;
 661         if (pv) {
 662                 set_image (pv);
 663                 draw (pv->inter_position(), pv->inter_size());
 664                 _viewer->image_changed (pv);
 665         }
 666 }
 667
 668
 669 void
 670 GLVideoView::thread ()
 671 try
 672 {
 673         start_of_thread ("GLVideoView");
 674
 675 #if defined(DCPOMATIC_OSX)
 676         /* Without this we see errors like
 677          * ../src/osx/cocoa/glcanvas.mm(194): assert ""context"" failed in SwapBuffers(): should have current context [in thread 700006970000]
 678          */
 679         WXGLSetCurrentContext (_context->GetWXGLContext());
 680 #else
 681         if (!_setup_shaders_done) {
 682                 setup_shaders ();
 683                 _setup_shaders_done = true;
 684         }
 685 #endif
 686
 687 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
 688         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
 689                 /* Enable vsync */
 690                 Display* dpy = wxGetX11Display();
 691                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
 692                 _vsync_enabled = true;
 693         }
 694 #endif
 695
 696 #ifdef DCPOMATIC_WINDOWS
 697         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
 698                 /* Enable vsync */
 699                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
 700                 if (swap) {
 701                         swap (1);
 702                         _vsync_enabled = true;
 703                 }
 704         }
 705
 706 #endif
 707
 708 #ifdef DCPOMATIC_OSX
 709         /* Enable vsync */
 710         GLint swapInterval = 1;
 711         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
 712         _vsync_enabled = true;
 713 #endif
 714
 715         _video_texture.reset(new Texture(_optimise_for_j2k ? 2 : 1));
 716         _subtitle_texture.reset(new Texture(1));
 717
 718         while (true) {
 719                 boost::mutex::scoped_lock lm (_playing_mutex);
 720                 while (!_playing && !_one_shot) {
 721                         _thread_work_condition.wait (lm);
 722                 }
 723                 lm.unlock ();
 724
 725                 if (_playing) {
 726                         thread_playing ();
 727                 } else if (_one_shot) {
 728                         _one_shot = false;
 729                         set_image_and_draw ();
 730                 }
 731
 732                 boost::this_thread::interruption_point ();
 733                 dcpomatic_sleep_milliseconds (time_until_next_frame().get_value_or(0));
 734         }
 735
 736         /* XXX: leaks _context, but that seems preferable to deleting it here
 737          * without also deleting the wxGLCanvas.
 738          */
 739 }
 740 catch (...)
 741 {
 742         store_current ();
 743 }
 744
 745
 746 VideoView::NextFrameResult
 747 GLVideoView::display_next_frame (bool non_blocking)
 748 {
 749         NextFrameResult const r = get_next_frame (non_blocking);
 750         request_one_shot ();
 751         return r;
 752 }
 753
 754
 755 void
 756 GLVideoView::request_one_shot ()
 757 {
 758         boost::mutex::scoped_lock lm (_playing_mutex);
 759         _one_shot = true;
 760         _thread_work_condition.notify_all ();
 761 }
 762
 763
 764 Texture::Texture (GLint unpack_alignment)
 765         : _unpack_alignment (unpack_alignment)
 766 {
 767         glGenTextures (1, &_name);
 768         check_gl_error ("glGenTextures");
 769 }
 770
 771
 772 Texture::~Texture ()
 773 {
 774         glDeleteTextures (1, &_name);
 775 }
 776
 777
 778 void
 779 Texture::bind ()
 780 {
 781         glBindTexture(GL_TEXTURE_2D, _name);
 782         check_gl_error ("glBindTexture");
 783 }
 784
 785
 786 void
 787 Texture::set (shared_ptr<const Image> image)
 788 {
 789         auto const create = !_size || image->size() != _size;
 790         _size = image->size();
 791
 792         glPixelStorei (GL_UNPACK_ALIGNMENT, _unpack_alignment);
 793         check_gl_error ("glPixelStorei");
 794
 795         DCPOMATIC_ASSERT (image->alignment() == Image::Alignment::COMPACT);
 796
 797         GLint internal_format;
 798         GLenum format;
 799         GLenum type;
 800
 801         switch (image->pixel_format()) {
 802         case AV_PIX_FMT_BGRA:
 803                 internal_format = GL_RGBA8;
 804                 format = GL_BGRA;
 805                 type = GL_UNSIGNED_BYTE;
 806                 break;
 807         case AV_PIX_FMT_RGBA:
 808                 internal_format = GL_RGBA8;
 809                 format = GL_RGBA;
 810                 type = GL_UNSIGNED_BYTE;
 811                 break;
 812         case AV_PIX_FMT_RGB24:
 813                 internal_format = GL_RGBA8;
 814                 format = GL_RGB;
 815                 type = GL_UNSIGNED_BYTE;
 816                 break;
 817         case AV_PIX_FMT_XYZ12:
 818                 internal_format = GL_RGBA12;
 819                 format = GL_RGB;
 820                 type = GL_UNSIGNED_SHORT;
 821                 break;
 822         default:
 823                 throw PixelFormatError ("Texture::set", image->pixel_format());
 824         }
 825
 826         bind ();
 827
 828         if (create) {
 829                 glTexImage2D (GL_TEXTURE_2D, 0, internal_format, _size->width, _size->height, 0, format, type, image->data()[0]);
 830                 check_gl_error ("glTexImage2D");
 831         } else {
 832                 glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, _size->width, _size->height, format, type, image->data()[0]);
 833                 check_gl_error ("glTexSubImage2D");
 834         }
 835 }
 836
 837 #endif