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 (1.0f);
 439         check_gl_error ("glLineWidth");
 440         glEnable (GL_BLEND);
 441         check_gl_error ("glEnable");
 442         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 443         check_gl_error ("glBlendFunc");
 444
 445         /* Reserve space for the GL_ARRAY_BUFFER */
 446         glBufferData(GL_ARRAY_BUFFER, 12 * 5 * sizeof(float), nullptr, GL_STATIC_DRAW);
 447         check_gl_error ("glBufferData");
 448 }
 449
 450
 451 void
 452 GLVideoView::set_border_colour (GLuint program)
 453 {
 454         auto uniform = glGetUniformLocation (program, "border_colour");
 455         check_gl_error ("glGetUniformLocation");
 456         auto colour = outline_content_colour ();
 457         glUniform4f (uniform, colour.Red() / 255.0f, colour.Green() / 255.0f, colour.Blue() / 255.0f, 1.0f);
 458         check_gl_error ("glUniform4f");
 459 }
 460
 461
 462 void
 463 GLVideoView::draw ()
 464 {
 465         auto pad = pad_colour();
 466         glClearColor(pad.Red() / 255.0, pad.Green() / 255.0, pad.Blue() / 255.0, 1.0);
 467         glClear (GL_COLOR_BUFFER_BIT);
 468         check_gl_error ("glClear");
 469
 470         auto const size = _canvas_size.load();
 471         int const width = size.GetWidth();
 472         int const height = size.GetHeight();
 473
 474         if (width < 64 || height < 0) {
 475                 return;
 476         }
 477
 478         glViewport (0, 0, width, height);
 479         check_gl_error ("glViewport");
 480
 481         glBindVertexArray(_vao);
 482         check_gl_error ("glBindVertexArray");
 483         glUniform1i(_fragment_type, _optimise_for_j2k ? 1 : 2);
 484         _video_texture->bind();
 485         glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_video_texture * sizeof(int)));
 486         if (_have_subtitle_to_render) {
 487                 glUniform1i(_fragment_type, 2);
 488                 _subtitle_texture->bind();
 489                 glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_subtitle_texture * sizeof(int)));
 490         }
 491         if (_viewer->outline_content()) {
 492                 glUniform1i(_fragment_type, 0);
 493                 glDrawElements (GL_LINES, 8, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_border * sizeof(int)));
 494                 check_gl_error ("glDrawElements");
 495         }
 496
 497         glFlush();
 498         check_gl_error ("glFlush");
 499
 500         _canvas->SwapBuffers();
 501 }
 502
 503
 504 void
 505 GLVideoView::set_image (shared_ptr<const PlayerVideo> pv)
 506 {
 507         shared_ptr<const Image> video = _optimise_for_j2k ? pv->raw_image() : pv->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), VideoRange::FULL, true);
 508
 509         /* Only the player's black frames should be aligned at this stage, so this should
 510          * almost always have no work to do.
 511          */
 512         video = Image::ensure_alignment (video, Image::Alignment::COMPACT);
 513
 514         /** If _optimise_for_j2k is true we render a XYZ image, doing the colourspace
 515          *  conversion, scaling and video range conversion in the GL shader.
 516          *  Othewise we render a RGB image without any shader-side processing.
 517          */
 518
 519         /* XXX: video range conversion */
 520
 521         _video_texture->set (video);
 522
 523         auto const text = pv->text();
 524         _have_subtitle_to_render = static_cast<bool>(text) && _optimise_for_j2k;
 525         if (_have_subtitle_to_render) {
 526                 /* opt: only do this if it's a new subtitle? */
 527                 DCPOMATIC_ASSERT (text->image->alignment() == Image::Alignment::COMPACT);
 528                 _subtitle_texture->set (text->image);
 529         }
 530
 531
 532         auto const canvas_size = _canvas_size.load();
 533         int const canvas_width = canvas_size.GetWidth();
 534         int const canvas_height = canvas_size.GetHeight();
 535         auto const inter_position = player_video().first->inter_position();
 536         auto const inter_size = player_video().first->inter_size();
 537         auto const out_size = player_video().first->out_size();
 538
 539         auto x_offset = std::max(0, (canvas_width - out_size.width) / 2);
 540         auto y_offset = std::max(0, (canvas_height - out_size.height) / 2);
 541
 542         _last_canvas_size.set_next (canvas_size);
 543         _last_video_size.set_next (video->size());
 544         _last_inter_position.set_next (inter_position);
 545         _last_inter_size.set_next (inter_size);
 546         _last_out_size.set_next (out_size);
 547
 548         class Rectangle
 549         {
 550         public:
 551                 Rectangle (wxSize canvas_size, float x, float y, dcp::Size size)
 552                         : _canvas_size (canvas_size)
 553                 {
 554                         auto const x1 = x_pixels_to_gl(x);
 555                         auto const y1 = y_pixels_to_gl(y);
 556                         auto const x2 = x_pixels_to_gl(x + size.width);
 557                         auto const y2 = y_pixels_to_gl(y + size.height);
 558
 559                         /* The texture coordinates here have to account for the fact that when we put images into the texture OpenGL
 560                          * expected us to start at the lower left but we actually started at the top left.  So although the
 561                          * top of the texture is at 1.0 we pretend it's the other way round.
 562                          */
 563
 564                         // bottom right
 565                         _vertices[0] = x2;
 566                         _vertices[1] = y2;
 567                         _vertices[2] = 0.0f;
 568                         _vertices[3] = 1.0f;
 569                         _vertices[4] = 1.0f;
 570
 571                         // top right
 572                         _vertices[5] = x2;
 573                         _vertices[6] = y1;
 574                         _vertices[7] = 0.0f;
 575                         _vertices[8] = 1.0f;
 576                         _vertices[9] = 0.0f;
 577
 578                         // top left
 579                         _vertices[10] = x1;
 580                         _vertices[11] = y1;
 581                         _vertices[12] = 0.0f;
 582                         _vertices[13] = 0.0f;
 583                         _vertices[14] = 0.0f;
 584
 585                         // bottom left
 586                         _vertices[15] = x1;
 587                         _vertices[16] = y2;
 588                         _vertices[17] = 0.0f;
 589                         _vertices[18] = 0.0f;
 590                         _vertices[19] = 1.0f;
 591                 }
 592
 593                 float const * vertices () const {
 594                         return _vertices;
 595                 }
 596
 597                 int const size () const {
 598                         return sizeof(_vertices);
 599                 }
 600
 601         private:
 602                 /* @param x x position in pixels where 0 is left and canvas_width is right on screen */
 603                 float x_pixels_to_gl(int x) const {
 604                         return (x * 2.0f / _canvas_size.GetWidth()) - 1.0f;
 605                 }
 606
 607                 /* @param y y position in pixels where 0 is top and canvas_height is bottom on screen */
 608                 float y_pixels_to_gl(int y) const {
 609                         return 1.0f - (y * 2.0f / _canvas_size.GetHeight());
 610                 }
 611
 612                 wxSize _canvas_size;
 613                 float _vertices[20];
 614         };
 615
 616         if (_last_canvas_size.changed() || _last_inter_position.changed() || _last_inter_size.changed() || _last_out_size.changed()) {
 617
 618                 const auto video = _optimise_for_j2k ?
 619                         Rectangle(canvas_size, inter_position.x + x_offset, inter_position.y + y_offset, inter_size)
 620                         : Rectangle(canvas_size, x_offset, y_offset, out_size);
 621
 622                 glBufferSubData (GL_ARRAY_BUFFER, 0, video.size(), video.vertices());
 623                 check_gl_error ("glBufferSubData (video)");
 624
 625                 const auto border = Rectangle(canvas_size, inter_position.x + x_offset, inter_position.y + y_offset, inter_size);
 626                 glBufferSubData (GL_ARRAY_BUFFER, 8 * 5 * sizeof(float), border.size(), border.vertices());
 627                 check_gl_error ("glBufferSubData (border)");
 628         }
 629
 630         if (_have_subtitle_to_render) {
 631                 const auto subtitle = Rectangle(canvas_size, inter_position.x + x_offset + text->position.x, inter_position.y + y_offset + text->position.y, text->image->size());
 632                 glBufferSubData (GL_ARRAY_BUFFER, 4 * 5 * sizeof(float), subtitle.size(), subtitle.vertices());
 633                 check_gl_error ("glBufferSubData (subtitle)");
 634         }
 635
 636         /* opt: where should these go? */
 637
 638         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 639         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 640         check_gl_error ("glTexParameteri");
 641
 642         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 643         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 644         check_gl_error ("glTexParameterf");
 645 }
 646
 647
 648 void
 649 GLVideoView::start ()
 650 {
 651         VideoView::start ();
 652
 653         boost::mutex::scoped_lock lm (_playing_mutex);
 654         _playing = true;
 655         _thread_work_condition.notify_all ();
 656 }
 657
 658 void
 659 GLVideoView::stop ()
 660 {
 661         boost::mutex::scoped_lock lm (_playing_mutex);
 662         _playing = false;
 663 }
 664
 665
 666 void
 667 GLVideoView::thread_playing ()
 668 {
 669         if (length() != dcpomatic::DCPTime()) {
 670                 auto const next = position() + one_video_frame();
 671
 672                 if (next >= length()) {
 673                         _viewer->finished ();
 674                         return;
 675                 }
 676
 677                 get_next_frame (false);
 678                 set_image_and_draw ();
 679         }
 680
 681         while (true) {
 682                 optional<int> n = time_until_next_frame();
 683                 if (!n || *n > 5) {
 684                         break;
 685                 }
 686                 get_next_frame (true);
 687                 add_dropped ();
 688         }
 689 }
 690
 691
 692 void
 693 GLVideoView::set_image_and_draw ()
 694 {
 695         auto pv = player_video().first;
 696         if (pv) {
 697                 set_image (pv);
 698         }
 699
 700         draw ();
 701
 702         if (pv) {
 703                 _viewer->image_changed (pv);
 704         }
 705 }
 706
 707
 708 void
 709 GLVideoView::thread ()
 710 try
 711 {
 712         start_of_thread ("GLVideoView");
 713
 714 #if defined(DCPOMATIC_OSX)
 715         /* Without this we see errors like
 716          * ../src/osx/cocoa/glcanvas.mm(194): assert ""context"" failed in SwapBuffers(): should have current context [in thread 700006970000]
 717          */
 718         WXGLSetCurrentContext (_context->GetWXGLContext());
 719 #else
 720         if (!_setup_shaders_done) {
 721                 setup_shaders ();
 722                 _setup_shaders_done = true;
 723         }
 724 #endif
 725
 726 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
 727         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
 728                 /* Enable vsync */
 729                 Display* dpy = wxGetX11Display();
 730                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
 731                 _vsync_enabled = true;
 732         }
 733 #endif
 734
 735 #ifdef DCPOMATIC_WINDOWS
 736         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
 737                 /* Enable vsync */
 738                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
 739                 if (swap) {
 740                         swap (1);
 741                         _vsync_enabled = true;
 742                 }
 743         }
 744
 745 #endif
 746
 747 #ifdef DCPOMATIC_OSX
 748         /* Enable vsync */
 749         GLint swapInterval = 1;
 750         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
 751         _vsync_enabled = true;
 752 #endif
 753
 754         _video_texture.reset(new Texture(_optimise_for_j2k ? 2 : 1));
 755         _subtitle_texture.reset(new Texture(1));
 756
 757         while (true) {
 758                 boost::mutex::scoped_lock lm (_playing_mutex);
 759                 while (!_playing && !_one_shot) {
 760                         _thread_work_condition.wait (lm);
 761                 }
 762                 lm.unlock ();
 763
 764                 if (_playing) {
 765                         thread_playing ();
 766                 } else if (_one_shot) {
 767                         _one_shot = false;
 768                         set_image_and_draw ();
 769                 }
 770
 771                 boost::this_thread::interruption_point ();
 772                 dcpomatic_sleep_milliseconds (time_until_next_frame().get_value_or(0));
 773         }
 774
 775         /* XXX: leaks _context, but that seems preferable to deleting it here
 776          * without also deleting the wxGLCanvas.
 777          */
 778 }
 779 catch (...)
 780 {
 781         store_current ();
 782 }
 783
 784
 785 VideoView::NextFrameResult
 786 GLVideoView::display_next_frame (bool non_blocking)
 787 {
 788         NextFrameResult const r = get_next_frame (non_blocking);
 789         request_one_shot ();
 790         return r;
 791 }
 792
 793
 794 void
 795 GLVideoView::request_one_shot ()
 796 {
 797         boost::mutex::scoped_lock lm (_playing_mutex);
 798         _one_shot = true;
 799         _thread_work_condition.notify_all ();
 800 }
 801
 802
 803 Texture::Texture (GLint unpack_alignment)
 804         : _unpack_alignment (unpack_alignment)
 805 {
 806         glGenTextures (1, &_name);
 807         check_gl_error ("glGenTextures");
 808 }
 809
 810
 811 Texture::~Texture ()
 812 {
 813         glDeleteTextures (1, &_name);
 814 }
 815
 816
 817 void
 818 Texture::bind ()
 819 {
 820         glBindTexture(GL_TEXTURE_2D, _name);
 821         check_gl_error ("glBindTexture");
 822 }
 823
 824
 825 void
 826 Texture::set (shared_ptr<const Image> image)
 827 {
 828         auto const create = !_size || image->size() != _size;
 829         _size = image->size();
 830
 831         glPixelStorei (GL_UNPACK_ALIGNMENT, _unpack_alignment);
 832         check_gl_error ("glPixelStorei");
 833
 834         DCPOMATIC_ASSERT (image->alignment() == Image::Alignment::COMPACT);
 835
 836         GLint internal_format;
 837         GLenum format;
 838         GLenum type;
 839
 840         switch (image->pixel_format()) {
 841         case AV_PIX_FMT_BGRA:
 842                 internal_format = GL_RGBA8;
 843                 format = GL_BGRA;
 844                 type = GL_UNSIGNED_BYTE;
 845                 break;
 846         case AV_PIX_FMT_RGBA:
 847                 internal_format = GL_RGBA8;
 848                 format = GL_RGBA;
 849                 type = GL_UNSIGNED_BYTE;
 850                 break;
 851         case AV_PIX_FMT_RGB24:
 852                 internal_format = GL_RGBA8;
 853                 format = GL_RGB;
 854                 type = GL_UNSIGNED_BYTE;
 855                 break;
 856         case AV_PIX_FMT_XYZ12:
 857                 internal_format = GL_RGBA12;
 858                 format = GL_RGB;
 859                 type = GL_UNSIGNED_SHORT;
 860                 break;
 861         default:
 862                 throw PixelFormatError ("Texture::set", image->pixel_format());
 863         }
 864
 865         bind ();
 866
 867         if (create) {
 868                 glTexImage2D (GL_TEXTURE_2D, 0, internal_format, _size->width, _size->height, 0, format, type, image->data()[0]);
 869                 check_gl_error ("glTexImage2D");
 870         } else {
 871                 glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, _size->width, _size->height, format, type, image->data()[0]);
 872                 check_gl_error ("glTexSubImage2D");
 873         }
 874 }
 875
 876 #endif