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