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
 119 void
 120 GLVideoView::check_for_butler_errors ()
 121 {
 122         if (!_viewer->butler()) {
 123                 return;
 124         }
 125
 126         try {
 127                 _viewer->butler()->rethrow ();
 128         } catch (DecodeError& e) {
 129                 error_dialog (get(), e.what());
 130         } catch (dcp::ReadError& e) {
 131                 error_dialog (get(), wxString::Format(_("Could not read DCP: %s"), std_to_wx(e.what())));
 132         }
 133 }
 134
 135
 136 /** Called from the UI thread */
 137 void
 138 GLVideoView::update ()
 139 {
 140         if (!_canvas->IsShownOnScreen()) {
 141                 return;
 142         }
 143
 144         /* It appears important to do this from the GUI thread; if we do it from the GL thread
 145          * on Linux we get strange failures to create the context for any version of GL higher
 146          * than 3.2.
 147          */
 148         ensure_context ();
 149
 150 #ifdef DCPOMATIC_OSX
 151         /* macOS gives errors if we don't do this (and therefore [NSOpenGLContext setView:]) from the main thread */
 152         if (!_setup_shaders_done) {
 153                 setup_shaders ();
 154                 _setup_shaders_done = true;
 155         }
 156 #endif
 157
 158         if (!_thread.joinable()) {
 159                 _thread = boost::thread (boost::bind(&GLVideoView::thread, this));
 160         }
 161
 162         request_one_shot ();
 163
 164         rethrow ();
 165 }
 166
 167
 168 static constexpr char vertex_source[] =
 169 "#version 330 core\n"
 170 "\n"
 171 "layout (location = 0) in vec3 in_pos;\n"
 172 "layout (location = 1) in vec2 in_tex_coord;\n"
 173 "\n"
 174 "out vec2 TexCoord;\n"
 175 "\n"
 176 "void main()\n"
 177 "{\n"
 178 "       gl_Position = vec4(in_pos, 1.0);\n"
 179 "       TexCoord = in_tex_coord;\n"
 180 "}\n";
 181
 182
 183 /* Bicubic interpolation stolen from https://stackoverflow.com/questions/13501081/efficient-bicubic-filtering-code-in-glsl */
 184 static constexpr char fragment_source[] =
 185 "#version 330 core\n"
 186 "\n"
 187 "in vec2 TexCoord;\n"
 188 "\n"
 189 "uniform sampler2D texture_sampler;\n"
 190 /* type = 0: draw border
 191  * type = 1: draw XYZ image
 192  * type = 2: draw RGB image
 193  */
 194 "uniform int type = 0;\n"
 195 "uniform vec4 border_colour;\n"
 196 "uniform mat4 colour_conversion;\n"
 197 "\n"
 198 "out vec4 FragColor;\n"
 199 "\n"
 200 "vec4 cubic(float x)\n"
 201 "\n"
 202 "#define IN_GAMMA 2.2\n"
 203 "#define OUT_GAMMA 0.384615385\n"       //  1 /  2.6
 204 "#define DCI_COEFFICIENT 0.91655528\n"  // 48 / 53.37
 205 "\n"
 206 "{\n"
 207 "    float x2 = x * x;\n"
 208 "    float x3 = x2 * x;\n"
 209 "    vec4 w;\n"
 210 "    w.x =     -x3 + 3 * x2 - 3 * x + 1;\n"
 211 "    w.y =  3 * x3 - 6 * x2         + 4;\n"
 212 "    w.z = -3 * x3 + 3 * x2 + 3 * x + 1;\n"
 213 "    w.w =  x3;\n"
 214 "    return w / 6.f;\n"
 215 "}\n"
 216 "\n"
 217 "vec4 texture_bicubic(sampler2D sampler, vec2 tex_coords)\n"
 218 "{\n"
 219 "   vec2 tex_size = textureSize(sampler, 0);\n"
 220 "   vec2 inv_tex_size = 1.0 / tex_size;\n"
 221 "\n"
 222 "   tex_coords = tex_coords * tex_size - 0.5;\n"
 223 "\n"
 224 "   vec2 fxy = fract(tex_coords);\n"
 225 "   tex_coords -= fxy;\n"
 226 "\n"
 227 "   vec4 xcubic = cubic(fxy.x);\n"
 228 "   vec4 ycubic = cubic(fxy.y);\n"
 229 "\n"
 230 "   vec4 c = tex_coords.xxyy + vec2 (-0.5, +1.5).xyxy;\n"
 231 "\n"
 232 "   vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);\n"
 233 "   vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;\n"
 234 "\n"
 235 "   offset *= inv_tex_size.xxyy;\n"
 236 "\n"
 237 "   vec4 sample0 = texture(sampler, offset.xz);\n"
 238 "   vec4 sample1 = texture(sampler, offset.yz);\n"
 239 "   vec4 sample2 = texture(sampler, offset.xw);\n"
 240 "   vec4 sample3 = texture(sampler, offset.yw);\n"
 241 "\n"
 242 "   float sx = s.x / (s.x + s.y);\n"
 243 "   float sy = s.z / (s.z + s.w);\n"
 244 "\n"
 245 "   return mix(\n"
 246 "          mix(sample3, sample2, sx), mix(sample1, sample0, sx)\n"
 247 "          , sy);\n"
 248 "}\n"
 249 "\n"
 250 "void main()\n"
 251 "{\n"
 252 "       switch (type) {\n"
 253 "               case 0:\n"
 254 "                       FragColor = border_colour;\n"
 255 "                       break;\n"
 256 "               case 1:\n"
 257 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 258 "                       FragColor.x = pow(FragColor.x, IN_GAMMA) / DCI_COEFFICIENT;\n"
 259 "                       FragColor.y = pow(FragColor.y, IN_GAMMA) / DCI_COEFFICIENT;\n"
 260 "                       FragColor.z = pow(FragColor.z, IN_GAMMA) / DCI_COEFFICIENT;\n"
 261 "                       FragColor = colour_conversion * FragColor;\n"
 262 "                       FragColor.x = pow(FragColor.x, OUT_GAMMA);\n"
 263 "                       FragColor.y = pow(FragColor.y, OUT_GAMMA);\n"
 264 "                       FragColor.z = pow(FragColor.z, OUT_GAMMA);\n"
 265 "                       break;\n"
 266 "               case 2:\n"
 267 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 268 "                       break;\n"
 269 "       }\n"
 270 "}\n";
 271
 272
 273 void
 274 GLVideoView::ensure_context ()
 275 {
 276         if (!_context) {
 277                 wxGLContextAttrs attrs;
 278                 attrs.PlatformDefaults().CoreProfile().OGLVersion(4, 1).EndList();
 279                 _context = new wxGLContext (_canvas, nullptr, &attrs);
 280                 if (!_context->IsOK()) {
 281                         throw GLError ("Making GL context", -1);
 282                 }
 283         }
 284 }
 285
 286
 287 /* Offset of video texture triangles in indices */
 288 static constexpr int indices_video_texture = 0;
 289 /* Offset of border lines in indices */
 290 static constexpr int indices_border = 6;
 291
 292 static constexpr unsigned int indices[] = {
 293         0, 1, 3, // video texture triangle #1
 294         1, 2, 3, // video texture triangle #2
 295         4, 5,    // border line #1
 296         5, 6,    // border line #2
 297         6, 7,    // border line #3
 298         7, 4,    // border line #4
 299 };
 300
 301
 302 void
 303 GLVideoView::setup_shaders ()
 304 {
 305         DCPOMATIC_ASSERT (_canvas);
 306         DCPOMATIC_ASSERT (_context);
 307         auto r = _canvas->SetCurrent (*_context);
 308         DCPOMATIC_ASSERT (r);
 309
 310 #ifdef DCPOMATIC_WINDOWS
 311         r = glewInit();
 312         if (r != GLEW_OK) {
 313                 throw GLError(reinterpret_cast<char const*>(glewGetErrorString(r)));
 314         }
 315 #endif
 316
 317         auto get_information = [this](GLenum name) {
 318                 auto s = glGetString (name);
 319                 if (s) {
 320                         _information[name] = std::string (reinterpret_cast<char const *>(s));
 321                 }
 322         };
 323
 324         get_information (GL_VENDOR);
 325         get_information (GL_RENDERER);
 326         get_information (GL_VERSION);
 327         get_information (GL_SHADING_LANGUAGE_VERSION);
 328
 329         glGenVertexArrays(1, &_vao);
 330         check_gl_error ("glGenVertexArrays");
 331         GLuint vbo;
 332         glGenBuffers(1, &vbo);
 333         check_gl_error ("glGenBuffers");
 334         GLuint ebo;
 335         glGenBuffers(1, &ebo);
 336         check_gl_error ("glGenBuffers");
 337
 338         glBindVertexArray(_vao);
 339         check_gl_error ("glBindVertexArray");
 340
 341         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 342         check_gl_error ("glBindBuffer");
 343
 344         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
 345         check_gl_error ("glBindBuffer");
 346         glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
 347         check_gl_error ("glBufferData");
 348
 349         /* position attribute to vertex shader (location = 0) */
 350         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), nullptr);
 351         glEnableVertexAttribArray(0);
 352         /* texture coord attribute to vertex shader (location = 1) */
 353         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), reinterpret_cast<void*>(3 * sizeof(float)));
 354         glEnableVertexAttribArray(1);
 355         check_gl_error ("glEnableVertexAttribArray");
 356
 357         auto compile = [](GLenum type, char const* source) -> GLuint {
 358                 auto shader = glCreateShader(type);
 359                 DCPOMATIC_ASSERT (shader);
 360                 GLchar const * src[] = { static_cast<GLchar const *>(source) };
 361                 glShaderSource(shader, 1, src, nullptr);
 362                 check_gl_error ("glShaderSource");
 363                 glCompileShader(shader);
 364                 check_gl_error ("glCompileShader");
 365                 GLint ok;
 366                 glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
 367                 if (!ok) {
 368                         GLint log_length;
 369                         glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
 370                         string log;
 371                         if (log_length > 0) {
 372                                 char* log_char = new char[log_length];
 373                                 glGetShaderInfoLog(shader, log_length, nullptr, log_char);
 374                                 log = string(log_char);
 375                                 delete[] log_char;
 376                         }
 377                         glDeleteShader(shader);
 378                         throw GLError(String::compose("Could not compile shader (%1)", log).c_str(), -1);
 379                 }
 380                 return shader;
 381         };
 382
 383         auto vertex_shader = compile (GL_VERTEX_SHADER, vertex_source);
 384         auto fragment_shader = compile (GL_FRAGMENT_SHADER, fragment_source);
 385
 386         auto program = glCreateProgram();
 387         check_gl_error ("glCreateProgram");
 388         glAttachShader (program, vertex_shader);
 389         check_gl_error ("glAttachShader");
 390         glAttachShader (program, fragment_shader);
 391         check_gl_error ("glAttachShader");
 392         glLinkProgram (program);
 393         check_gl_error ("glLinkProgram");
 394         GLint ok;
 395         glGetProgramiv (program, GL_LINK_STATUS, &ok);
 396         if (!ok) {
 397                 GLint log_length;
 398                 glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_length);
 399                 string log;
 400                 if (log_length > 0) {
 401                         char* log_char = new char[log_length];
 402                         glGetProgramInfoLog(program, log_length, nullptr, log_char);
 403                         log = string(log_char);
 404                         delete[] log_char;
 405                 }
 406                 glDeleteProgram (program);
 407                 throw GLError(String::compose("Could not link shader (%1)", log).c_str(), -1);
 408         }
 409         glDeleteShader (vertex_shader);
 410         glDeleteShader (fragment_shader);
 411
 412         glUseProgram (program);
 413
 414         _fragment_type = glGetUniformLocation (program, "type");
 415         check_gl_error ("glGetUniformLocation");
 416         set_border_colour (program);
 417
 418         auto conversion = dcp::ColourConversion::rec709_to_xyz();
 419         boost::numeric::ublas::matrix<double> matrix = conversion.xyz_to_rgb ();
 420         GLfloat gl_matrix[] = {
 421                 static_cast<float>(matrix(0, 0)), static_cast<float>(matrix(0, 1)), static_cast<float>(matrix(0, 2)), 0.0f,
 422                 static_cast<float>(matrix(1, 0)), static_cast<float>(matrix(1, 1)), static_cast<float>(matrix(1, 2)), 0.0f,
 423                 static_cast<float>(matrix(2, 0)), static_cast<float>(matrix(2, 1)), static_cast<float>(matrix(2, 2)), 0.0f,
 424                 0.0f, 0.0f, 0.0f, 1.0f
 425                 };
 426
 427         auto colour_conversion = glGetUniformLocation (program, "colour_conversion");
 428         check_gl_error ("glGetUniformLocation");
 429         glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
 430
 431         glLineWidth (2.0f);
 432 }
 433
 434
 435 void
 436 GLVideoView::set_border_colour (GLuint program)
 437 {
 438         auto uniform = glGetUniformLocation (program, "border_colour");
 439         check_gl_error ("glGetUniformLocation");
 440         auto colour = outline_content_colour ();
 441         glUniform4f (uniform, colour.Red() / 255.0f, colour.Green() / 255.0f, colour.Blue() / 255.0f, 1.0f);
 442         check_gl_error ("glUniform4f");
 443 }
 444
 445
 446 void
 447 GLVideoView::draw (Position<int>, dcp::Size)
 448 {
 449         auto pad = pad_colour();
 450         glClearColor(pad.Red() / 255.0, pad.Green() / 255.0, pad.Blue() / 255.0, 1.0);
 451         glClear (GL_COLOR_BUFFER_BIT);
 452         check_gl_error ("glClear");
 453
 454         auto const size = _canvas_size.load();
 455         int const width = size.GetWidth();
 456         int const height = size.GetHeight();
 457
 458         if (width < 64 || height < 0) {
 459                 return;
 460         }
 461
 462         glViewport (0, 0, width, height);
 463         check_gl_error ("glViewport");
 464
 465         glBindVertexArray(_vao);
 466         check_gl_error ("glBindVertexArray");
 467         glUniform1i(_fragment_type, _optimise_for_j2k ? 1 : 2);
 468         glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_video_texture));
 469         if (_viewer->outline_content()) {
 470                 glUniform1i(_fragment_type, 1);
 471                 glDrawElements (GL_LINES, 8, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_border * sizeof(int)));
 472                 check_gl_error ("glDrawElements");
 473         }
 474
 475         glFlush();
 476         check_gl_error ("glFlush");
 477
 478         _canvas->SwapBuffers();
 479 }
 480
 481
 482 void
 483 GLVideoView::set_image (shared_ptr<const PlayerVideo> pv)
 484 {
 485         auto image = _optimise_for_j2k ? pv->raw_image() : pv->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), VideoRange::FULL, false, true);
 486
 487         DCPOMATIC_ASSERT (!image->aligned());
 488
 489         /** If _optimise_for_j2k is true we render a XYZ image, doing the colourspace
 490          *  conversion, scaling and video range conversion in the GL shader.
 491          *  Othewise we render a RGB image without any shader-side processing.
 492          */
 493
 494         /* XXX: video range conversion */
 495         /* XXX: subs */
 496
 497         if (image->size() != _video_size) {
 498                 _have_storage = false;
 499         }
 500
 501         _video_size = image->size ();
 502         glPixelStorei (GL_UNPACK_ALIGNMENT, _optimise_for_j2k ? 2 : 1);
 503         check_gl_error ("glPixelStorei");
 504
 505         auto const format = _optimise_for_j2k ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
 506
 507         if (_have_storage) {
 508                 glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, _video_size->width, _video_size->height, GL_RGB, format, image->data()[0]);
 509                 check_gl_error ("glTexSubImage2D");
 510         } else {
 511                 glTexImage2D (GL_TEXTURE_2D, 0, _optimise_for_j2k ? GL_RGBA12 : GL_RGBA8, _video_size->width, _video_size->height, 0, GL_RGB, format, image->data()[0]);
 512                 check_gl_error ("glTexImage2D");
 513
 514                 auto const canvas_size = _canvas_size.load();
 515                 int const canvas_width = canvas_size.GetWidth();
 516                 int const canvas_height = canvas_size.GetHeight();
 517
 518                 float const image_x = float(_video_size->width) / canvas_width;
 519                 float const image_y = float(_video_size->height) / canvas_height;
 520
 521                 auto x_pixels_to_gl = [canvas_width](int x) {
 522                         return (x * 2.0f / canvas_width) - 1.0f;
 523                 };
 524
 525                 auto y_pixels_to_gl = [canvas_height](int y) {
 526                         return (y * 2.0f / canvas_height) - 1.0f;
 527                 };
 528
 529                 auto inter_position = player_video().first->inter_position();
 530                 auto inter_size = player_video().first->inter_size();
 531
 532                 float const border_x1 = x_pixels_to_gl (inter_position.x) + 1.0f - image_x;
 533                 float const border_y1 = y_pixels_to_gl (inter_position.y) + 1.0f - image_y;
 534                 float const border_x2 = x_pixels_to_gl (inter_position.x + inter_size.width) + 1.0f - image_x;
 535                 float const border_y2 = y_pixels_to_gl (inter_position.y + inter_size.height) + 1.0f - image_y;
 536
 537                 float vertices[] = {
 538                         // positions                  // texture coords
 539                          image_x,   image_y,   0.0f,  1.0f, 0.0f,   // video texture top right    (index 0)
 540                          image_x,  -image_y,   0.0f,  1.0f, 1.0f,   // video texture bottom right (index 1)
 541                         -image_x,  -image_y,   0.0f,  0.0f, 1.0f,   // video texture bottom left  (index 2)
 542                         -image_x,   image_y,   0.0f,  0.0f, 0.0f,   // video texture top left     (index 3)
 543                          border_x1, border_y1, 0.0f,  0.0f, 0.0f,   // border bottom left         (index 4)
 544                          border_x1, border_y2, 0.0f,  0.0f, 0.0f,   // border top left            (index 5)
 545                          border_x2, border_y2, 0.0f,  0.0f, 0.0f,   // border top right           (index 6)
 546                          border_x2, border_y1, 0.0f,  0.0f, 0.0f,   // border bottom right        (index 7)
 547                 };
 548
 549                 /* Set the vertex shader's input data (GL_ARRAY_BUFFER) */
 550                 glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 551                 check_gl_error ("glBufferData");
 552
 553                 _have_storage = true;
 554         }
 555
 556         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 557         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 558         check_gl_error ("glTexParameteri");
 559
 560         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 561         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 562         check_gl_error ("glTexParameterf");
 563 }
 564
 565
 566 void
 567 GLVideoView::start ()
 568 {
 569         VideoView::start ();
 570
 571         boost::mutex::scoped_lock lm (_playing_mutex);
 572         _playing = true;
 573         _thread_work_condition.notify_all ();
 574 }
 575
 576 void
 577 GLVideoView::stop ()
 578 {
 579         boost::mutex::scoped_lock lm (_playing_mutex);
 580         _playing = false;
 581 }
 582
 583
 584 void
 585 GLVideoView::thread_playing ()
 586 {
 587         if (length() != dcpomatic::DCPTime()) {
 588                 auto const next = position() + one_video_frame();
 589
 590                 if (next >= length()) {
 591                         _viewer->finished ();
 592                         return;
 593                 }
 594
 595                 get_next_frame (false);
 596                 set_image_and_draw ();
 597         }
 598
 599         while (true) {
 600                 optional<int> n = time_until_next_frame();
 601                 if (!n || *n > 5) {
 602                         break;
 603                 }
 604                 get_next_frame (true);
 605                 add_dropped ();
 606         }
 607 }
 608
 609
 610 void
 611 GLVideoView::set_image_and_draw ()
 612 {
 613         auto pv = player_video().first;
 614         if (pv) {
 615                 set_image (pv);
 616                 draw (pv->inter_position(), pv->inter_size());
 617                 _viewer->image_changed (pv);
 618         }
 619 }
 620
 621
 622 void
 623 GLVideoView::thread ()
 624 try
 625 {
 626         start_of_thread ("GLVideoView");
 627
 628 #if defined(DCPOMATIC_OSX)
 629         /* Without this we see errors like
 630          * ../src/osx/cocoa/glcanvas.mm(194): assert ""context"" failed in SwapBuffers(): should have current context [in thread 700006970000]
 631          */
 632         WXGLSetCurrentContext (_context->GetWXGLContext());
 633 #else
 634         if (!_setup_shaders_done) {
 635                 setup_shaders ();
 636                 _setup_shaders_done = true;
 637         }
 638 #endif
 639
 640 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
 641         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
 642                 /* Enable vsync */
 643                 Display* dpy = wxGetX11Display();
 644                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
 645                 _vsync_enabled = true;
 646         }
 647 #endif
 648
 649 #ifdef DCPOMATIC_WINDOWS
 650         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
 651                 /* Enable vsync */
 652                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
 653                 if (swap) {
 654                         swap (1);
 655                         _vsync_enabled = true;
 656                 }
 657         }
 658
 659 #endif
 660
 661 #ifdef DCPOMATIC_OSX
 662         /* Enable vsync */
 663         GLint swapInterval = 1;
 664         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
 665         _vsync_enabled = true;
 666 #endif
 667
 668         _video_texture.reset(new Texture());
 669         _video_texture->bind();
 670
 671         while (true) {
 672                 boost::mutex::scoped_lock lm (_playing_mutex);
 673                 while (!_playing && !_one_shot) {
 674                         _thread_work_condition.wait (lm);
 675                 }
 676                 lm.unlock ();
 677
 678                 if (_playing) {
 679                         thread_playing ();
 680                 } else if (_one_shot) {
 681                         _one_shot = false;
 682                         set_image_and_draw ();
 683                 }
 684
 685                 boost::this_thread::interruption_point ();
 686                 dcpomatic_sleep_milliseconds (time_until_next_frame().get_value_or(0));
 687         }
 688
 689         /* XXX: leaks _context, but that seems preferable to deleting it here
 690          * without also deleting the wxGLCanvas.
 691          */
 692 }
 693 catch (...)
 694 {
 695         store_current ();
 696 }
 697
 698
 699 VideoView::NextFrameResult
 700 GLVideoView::display_next_frame (bool non_blocking)
 701 {
 702         NextFrameResult const r = get_next_frame (non_blocking);
 703         request_one_shot ();
 704         return r;
 705 }
 706
 707
 708 void
 709 GLVideoView::request_one_shot ()
 710 {
 711         boost::mutex::scoped_lock lm (_playing_mutex);
 712         _one_shot = true;
 713         _thread_work_condition.notify_all ();
 714 }
 715
 716
 717 Texture::Texture ()
 718 {
 719         glGenTextures (1, &_name);
 720         check_gl_error ("glGenTextures");
 721 }
 722
 723
 724 Texture::~Texture ()
 725 {
 726         glDeleteTextures (1, &_name);
 727 }
 728
 729
 730 void
 731 Texture::bind ()
 732 {
 733         glBindTexture(GL_TEXTURE_2D, _name);
 734         check_gl_error ("glBindTexture");
 735 }
 736