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         auto const scale = _canvas->GetDPIScaleFactor();
 107         int const width = std::round(ev.GetSize().GetWidth() * scale);
 108         int const height = std::round(ev.GetSize().GetHeight() * scale);
 109         _canvas_size = { width, height };
 110         LOG_GENERAL("GLVideoView canvas size changed to %1x%2", width, height);
 111         Sized ();
 112 }
 113
 114
 115 GLVideoView::~GLVideoView ()
 116 {
 117         boost::this_thread::disable_interruption dis;
 118
 119         try {
 120                 _thread.interrupt ();
 121                 _thread.join ();
 122         } catch (...) {}
 123 }
 124
 125 void
 126 GLVideoView::check_for_butler_errors ()
 127 {
 128         if (!_viewer->butler()) {
 129                 return;
 130         }
 131
 132         try {
 133                 _viewer->butler()->rethrow ();
 134         } catch (DecodeError& e) {
 135                 error_dialog (get(), e.what());
 136         } catch (dcp::ReadError& e) {
 137                 error_dialog (get(), wxString::Format(_("Could not read DCP: %s"), std_to_wx(e.what())));
 138         }
 139 }
 140
 141
 142 /** Called from the UI thread */
 143 void
 144 GLVideoView::update ()
 145 {
 146         if (!_canvas->IsShownOnScreen()) {
 147                 return;
 148         }
 149
 150         /* It appears important to do this from the GUI thread; if we do it from the GL thread
 151          * on Linux we get strange failures to create the context for any version of GL higher
 152          * than 3.2.
 153          */
 154         ensure_context ();
 155
 156 #ifdef DCPOMATIC_OSX
 157         /* macOS gives errors if we don't do this (and therefore [NSOpenGLContext setView:]) from the main thread */
 158         if (!_setup_shaders_done) {
 159                 setup_shaders ();
 160                 _setup_shaders_done = true;
 161         }
 162 #endif
 163
 164         if (!_thread.joinable()) {
 165                 _thread = boost::thread (boost::bind(&GLVideoView::thread, this));
 166         }
 167
 168         request_one_shot ();
 169
 170         rethrow ();
 171 }
 172
 173
 174 static constexpr char vertex_source[] =
 175 "#version 330 core\n"
 176 "\n"
 177 "layout (location = 0) in vec3 in_pos;\n"
 178 "layout (location = 1) in vec2 in_tex_coord;\n"
 179 "\n"
 180 "out vec2 TexCoord;\n"
 181 "\n"
 182 "void main()\n"
 183 "{\n"
 184 "       gl_Position = vec4(in_pos, 1.0);\n"
 185 "       TexCoord = in_tex_coord;\n"
 186 "}\n";
 187
 188
 189 /* Bicubic interpolation stolen from https://stackoverflow.com/questions/13501081/efficient-bicubic-filtering-code-in-glsl */
 190 static constexpr char fragment_source[] =
 191 "#version 330 core\n"
 192 "\n"
 193 "in vec2 TexCoord;\n"
 194 "\n"
 195 "uniform sampler2D texture_sampler;\n"
 196 /* type = 0: draw border
 197  * type = 1: draw XYZ image
 198  * type = 2: draw RGB image
 199  */
 200 "uniform int type = 0;\n"
 201 "uniform vec4 border_colour;\n"
 202 "uniform mat4 colour_conversion;\n"
 203 "\n"
 204 "out vec4 FragColor;\n"
 205 "\n"
 206 "vec4 cubic(float x)\n"
 207 "\n"
 208 "#define IN_GAMMA 2.2\n"
 209 "#define OUT_GAMMA 0.384615385\n"       //  1 /  2.6
 210 "#define DCI_COEFFICIENT 0.91655528\n"  // 48 / 53.37
 211 "\n"
 212 "{\n"
 213 "    float x2 = x * x;\n"
 214 "    float x3 = x2 * x;\n"
 215 "    vec4 w;\n"
 216 "    w.x =     -x3 + 3 * x2 - 3 * x + 1;\n"
 217 "    w.y =  3 * x3 - 6 * x2         + 4;\n"
 218 "    w.z = -3 * x3 + 3 * x2 + 3 * x + 1;\n"
 219 "    w.w =  x3;\n"
 220 "    return w / 6.f;\n"
 221 "}\n"
 222 "\n"
 223 "vec4 texture_bicubic(sampler2D sampler, vec2 tex_coords)\n"
 224 "{\n"
 225 "   vec2 tex_size = textureSize(sampler, 0);\n"
 226 "   vec2 inv_tex_size = 1.0 / tex_size;\n"
 227 "\n"
 228 "   tex_coords = tex_coords * tex_size - 0.5;\n"
 229 "\n"
 230 "   vec2 fxy = fract(tex_coords);\n"
 231 "   tex_coords -= fxy;\n"
 232 "\n"
 233 "   vec4 xcubic = cubic(fxy.x);\n"
 234 "   vec4 ycubic = cubic(fxy.y);\n"
 235 "\n"
 236 "   vec4 c = tex_coords.xxyy + vec2 (-0.5, +1.5).xyxy;\n"
 237 "\n"
 238 "   vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);\n"
 239 "   vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;\n"
 240 "\n"
 241 "   offset *= inv_tex_size.xxyy;\n"
 242 "\n"
 243 "   vec4 sample0 = texture(sampler, offset.xz);\n"
 244 "   vec4 sample1 = texture(sampler, offset.yz);\n"
 245 "   vec4 sample2 = texture(sampler, offset.xw);\n"
 246 "   vec4 sample3 = texture(sampler, offset.yw);\n"
 247 "\n"
 248 "   float sx = s.x / (s.x + s.y);\n"
 249 "   float sy = s.z / (s.z + s.w);\n"
 250 "\n"
 251 "   return mix(\n"
 252 "          mix(sample3, sample2, sx), mix(sample1, sample0, sx)\n"
 253 "          , sy);\n"
 254 "}\n"
 255 "\n"
 256 "void main()\n"
 257 "{\n"
 258 "       switch (type) {\n"
 259 "               case 0:\n"
 260 "                       FragColor = border_colour;\n"
 261 "                       break;\n"
 262 "               case 1:\n"
 263 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 264 "                       FragColor.x = pow(FragColor.x, IN_GAMMA) / DCI_COEFFICIENT;\n"
 265 "                       FragColor.y = pow(FragColor.y, IN_GAMMA) / DCI_COEFFICIENT;\n"
 266 "                       FragColor.z = pow(FragColor.z, IN_GAMMA) / DCI_COEFFICIENT;\n"
 267 "                       FragColor = colour_conversion * FragColor;\n"
 268 "                       FragColor.x = pow(FragColor.x, OUT_GAMMA);\n"
 269 "                       FragColor.y = pow(FragColor.y, OUT_GAMMA);\n"
 270 "                       FragColor.z = pow(FragColor.z, OUT_GAMMA);\n"
 271 "                       break;\n"
 272 "               case 2:\n"
 273 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 274 "                       break;\n"
 275 "       }\n"
 276 "}\n";
 277
 278
 279 void
 280 GLVideoView::ensure_context ()
 281 {
 282         if (!_context) {
 283                 wxGLContextAttrs attrs;
 284                 attrs.PlatformDefaults().CoreProfile().OGLVersion(4, 1).EndList();
 285                 _context = new wxGLContext (_canvas, nullptr, &attrs);
 286                 if (!_context->IsOK()) {
 287                         throw GLError ("Making GL context", -1);
 288                 }
 289         }
 290 }
 291
 292
 293 /* Offset of video texture triangles in indices */
 294 static constexpr int indices_video_texture = 0;
 295 /* Offset of subtitle texture triangles in indices */
 296 static constexpr int indices_subtitle_texture = 6;
 297 /* Offset of border lines in indices */
 298 static constexpr int indices_border = 12;
 299
 300 static constexpr unsigned int indices[] = {
 301         0, 1, 3, // video texture triangle #1
 302         1, 2, 3, // video texture triangle #2
 303         4, 5, 7, // subtitle texture triangle #1
 304         5, 6, 7, // subtitle texture triangle #2
 305         8, 9,    // border line #1
 306         9, 10,   // border line #2
 307         10, 11,  // border line #3
 308         11, 8,   // border line #4
 309 };
 310
 311
 312 void
 313 GLVideoView::setup_shaders ()
 314 {
 315         DCPOMATIC_ASSERT (_canvas);
 316         DCPOMATIC_ASSERT (_context);
 317         auto r = _canvas->SetCurrent (*_context);
 318         DCPOMATIC_ASSERT (r);
 319
 320 #ifdef DCPOMATIC_WINDOWS
 321         r = glewInit();
 322         if (r != GLEW_OK) {
 323                 throw GLError(reinterpret_cast<char const*>(glewGetErrorString(r)));
 324         }
 325 #endif
 326
 327         auto get_information = [this](GLenum name) {
 328                 auto s = glGetString (name);
 329                 if (s) {
 330                         _information[name] = std::string (reinterpret_cast<char const *>(s));
 331                 }
 332         };
 333
 334         get_information (GL_VENDOR);
 335         get_information (GL_RENDERER);
 336         get_information (GL_VERSION);
 337         get_information (GL_SHADING_LANGUAGE_VERSION);
 338
 339         glGenVertexArrays(1, &_vao);
 340         check_gl_error ("glGenVertexArrays");
 341         GLuint vbo;
 342         glGenBuffers(1, &vbo);
 343         check_gl_error ("glGenBuffers");
 344         GLuint ebo;
 345         glGenBuffers(1, &ebo);
 346         check_gl_error ("glGenBuffers");
 347
 348         glBindVertexArray(_vao);
 349         check_gl_error ("glBindVertexArray");
 350
 351         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 352         check_gl_error ("glBindBuffer");
 353
 354         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
 355         check_gl_error ("glBindBuffer");
 356         glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
 357         check_gl_error ("glBufferData");
 358
 359         /* position attribute to vertex shader (location = 0) */
 360         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), nullptr);
 361         glEnableVertexAttribArray(0);
 362         /* texture coord attribute to vertex shader (location = 1) */
 363         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), reinterpret_cast<void*>(3 * sizeof(float)));
 364         glEnableVertexAttribArray(1);
 365         check_gl_error ("glEnableVertexAttribArray");
 366
 367         auto compile = [](GLenum type, char const* source) -> GLuint {
 368                 auto shader = glCreateShader(type);
 369                 DCPOMATIC_ASSERT (shader);
 370                 GLchar const * src[] = { static_cast<GLchar const *>(source) };
 371                 glShaderSource(shader, 1, src, nullptr);
 372                 check_gl_error ("glShaderSource");
 373                 glCompileShader(shader);
 374                 check_gl_error ("glCompileShader");
 375                 GLint ok;
 376                 glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
 377                 if (!ok) {
 378                         GLint log_length;
 379                         glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
 380                         string log;
 381                         if (log_length > 0) {
 382                                 std::vector<char> log_char(log_length);
 383                                 glGetShaderInfoLog(shader, log_length, nullptr, log_char.data());
 384                                 log = string(log_char.data());
 385                         }
 386                         glDeleteShader(shader);
 387                         throw GLError(String::compose("Could not compile shader (%1)", log).c_str(), -1);
 388                 }
 389                 return shader;
 390         };
 391
 392         auto vertex_shader = compile (GL_VERTEX_SHADER, vertex_source);
 393         auto fragment_shader = compile (GL_FRAGMENT_SHADER, fragment_source);
 394
 395         auto program = glCreateProgram();
 396         check_gl_error ("glCreateProgram");
 397         glAttachShader (program, vertex_shader);
 398         check_gl_error ("glAttachShader");
 399         glAttachShader (program, fragment_shader);
 400         check_gl_error ("glAttachShader");
 401         glLinkProgram (program);
 402         check_gl_error ("glLinkProgram");
 403         GLint ok;
 404         glGetProgramiv (program, GL_LINK_STATUS, &ok);
 405         if (!ok) {
 406                 GLint log_length;
 407                 glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_length);
 408                 string log;
 409                 if (log_length > 0) {
 410                         std::vector<char> log_char(log_length);
 411                         glGetProgramInfoLog(program, log_length, nullptr, log_char.data());
 412                         log = string(log_char.data());
 413                 }
 414                 glDeleteProgram (program);
 415                 throw GLError(String::compose("Could not link shader (%1)", log).c_str(), -1);
 416         }
 417         glDeleteShader (vertex_shader);
 418         glDeleteShader (fragment_shader);
 419
 420         glUseProgram (program);
 421
 422         _fragment_type = glGetUniformLocation (program, "type");
 423         check_gl_error ("glGetUniformLocation");
 424         set_border_colour (program);
 425
 426         auto conversion = dcp::ColourConversion::rec709_to_xyz();
 427         boost::numeric::ublas::matrix<double> matrix = conversion.xyz_to_rgb ();
 428         GLfloat gl_matrix[] = {
 429                 static_cast<float>(matrix(0, 0)), static_cast<float>(matrix(0, 1)), static_cast<float>(matrix(0, 2)), 0.0f,
 430                 static_cast<float>(matrix(1, 0)), static_cast<float>(matrix(1, 1)), static_cast<float>(matrix(1, 2)), 0.0f,
 431                 static_cast<float>(matrix(2, 0)), static_cast<float>(matrix(2, 1)), static_cast<float>(matrix(2, 2)), 0.0f,
 432                 0.0f, 0.0f, 0.0f, 1.0f
 433                 };
 434
 435         auto colour_conversion = glGetUniformLocation (program, "colour_conversion");
 436         check_gl_error ("glGetUniformLocation");
 437         glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
 438
 439         glLineWidth (1.0f);
 440         check_gl_error ("glLineWidth");
 441         glEnable (GL_BLEND);
 442         check_gl_error ("glEnable");
 443         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 444         check_gl_error ("glBlendFunc");
 445
 446         /* Reserve space for the GL_ARRAY_BUFFER */
 447         glBufferData(GL_ARRAY_BUFFER, 12 * 5 * sizeof(float), nullptr, GL_STATIC_DRAW);
 448         check_gl_error ("glBufferData");
 449 }
 450
 451
 452 void
 453 GLVideoView::set_border_colour (GLuint program)
 454 {
 455         auto uniform = glGetUniformLocation (program, "border_colour");
 456         check_gl_error ("glGetUniformLocation");
 457         auto colour = outline_content_colour ();
 458         glUniform4f (uniform, colour.Red() / 255.0f, colour.Green() / 255.0f, colour.Blue() / 255.0f, 1.0f);
 459         check_gl_error ("glUniform4f");
 460 }
 461
 462
 463 void
 464 GLVideoView::draw ()
 465 {
 466         auto pad = pad_colour();
 467         glClearColor(pad.Red() / 255.0, pad.Green() / 255.0, pad.Blue() / 255.0, 1.0);
 468         glClear (GL_COLOR_BUFFER_BIT);
 469         check_gl_error ("glClear");
 470
 471         auto const size = _canvas_size.load();
 472         int const width = size.GetWidth();
 473         int const height = size.GetHeight();
 474
 475         if (width < 64 || height < 0) {
 476                 return;
 477         }
 478
 479         glViewport (0, 0, width, height);
 480         check_gl_error ("glViewport");
 481
 482         glBindVertexArray(_vao);
 483         check_gl_error ("glBindVertexArray");
 484         glUniform1i(_fragment_type, _optimise_for_j2k ? 1 : 2);
 485         _video_texture->bind();
 486         glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_video_texture * sizeof(int)));
 487         if (_have_subtitle_to_render) {
 488                 glUniform1i(_fragment_type, 2);
 489                 _subtitle_texture->bind();
 490                 glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_subtitle_texture * sizeof(int)));
 491         }
 492         if (_viewer->outline_content()) {
 493                 glUniform1i(_fragment_type, 0);
 494                 glDrawElements (GL_LINES, 8, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_border * sizeof(int)));
 495                 check_gl_error ("glDrawElements");
 496         }
 497
 498         glFlush();
 499         check_gl_error ("glFlush");
 500
 501         _canvas->SwapBuffers();
 502 }
 503
 504
 505 void
 506 GLVideoView::set_image (shared_ptr<const PlayerVideo> pv)
 507 {
 508         shared_ptr<const Image> video = _optimise_for_j2k ? pv->raw_image() : pv->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), VideoRange::FULL, true);
 509
 510         /* Only the player's black frames should be aligned at this stage, so this should
 511          * almost always have no work to do.
 512          */
 513         video = Image::ensure_alignment (video, Image::Alignment::COMPACT);
 514
 515         /** If _optimise_for_j2k is true we render a XYZ image, doing the colourspace
 516          *  conversion, scaling and video range conversion in the GL shader.
 517          *  Othewise we render a RGB image without any shader-side processing.
 518          */
 519
 520         /* XXX: video range conversion */
 521
 522         _video_texture->set (video);
 523
 524         auto const text = pv->text();
 525         _have_subtitle_to_render = static_cast<bool>(text) && _optimise_for_j2k;
 526         if (_have_subtitle_to_render) {
 527                 /* opt: only do this if it's a new subtitle? */
 528                 DCPOMATIC_ASSERT (text->image->alignment() == Image::Alignment::COMPACT);
 529                 _subtitle_texture->set (text->image);
 530         }
 531
 532
 533         auto const canvas_size = _canvas_size.load();
 534         int const canvas_width = canvas_size.GetWidth();
 535         int const canvas_height = canvas_size.GetHeight();
 536         auto const inter_position = player_video().first->inter_position();
 537         auto const inter_size = player_video().first->inter_size();
 538         auto const out_size = player_video().first->out_size();
 539
 540         auto x_offset = std::max(0, (canvas_width - out_size.width) / 2);
 541         auto y_offset = std::max(0, (canvas_height - out_size.height) / 2);
 542
 543         _last_canvas_size.set_next (canvas_size);
 544         _last_video_size.set_next (video->size());
 545         _last_inter_position.set_next (inter_position);
 546         _last_inter_size.set_next (inter_size);
 547         _last_out_size.set_next (out_size);
 548
 549         class Rectangle
 550         {
 551         public:
 552                 Rectangle (wxSize canvas_size, float x, float y, dcp::Size size)
 553                         : _canvas_size (canvas_size)
 554                 {
 555                         auto const x1 = x_pixels_to_gl(x);
 556                         auto const y1 = y_pixels_to_gl(y);
 557                         auto const x2 = x_pixels_to_gl(x + size.width);
 558                         auto const y2 = y_pixels_to_gl(y + size.height);
 559
 560                         /* The texture coordinates here have to account for the fact that when we put images into the texture OpenGL
 561                          * expected us to start at the lower left but we actually started at the top left.  So although the
 562                          * top of the texture is at 1.0 we pretend it's the other way round.
 563                          */
 564
 565                         // bottom right
 566                         _vertices[0] = x2;
 567                         _vertices[1] = y2;
 568                         _vertices[2] = 0.0f;
 569                         _vertices[3] = 1.0f;
 570                         _vertices[4] = 1.0f;
 571
 572                         // top right
 573                         _vertices[5] = x2;
 574                         _vertices[6] = y1;
 575                         _vertices[7] = 0.0f;
 576                         _vertices[8] = 1.0f;
 577                         _vertices[9] = 0.0f;
 578
 579                         // top left
 580                         _vertices[10] = x1;
 581                         _vertices[11] = y1;
 582                         _vertices[12] = 0.0f;
 583                         _vertices[13] = 0.0f;
 584                         _vertices[14] = 0.0f;
 585
 586                         // bottom left
 587                         _vertices[15] = x1;
 588                         _vertices[16] = y2;
 589                         _vertices[17] = 0.0f;
 590                         _vertices[18] = 0.0f;
 591                         _vertices[19] = 1.0f;
 592                 }
 593
 594                 float const * vertices () const {
 595                         return _vertices;
 596                 }
 597
 598                 int const size () const {
 599                         return sizeof(_vertices);
 600                 }
 601
 602         private:
 603                 /* @param x x position in pixels where 0 is left and canvas_width is right on screen */
 604                 float x_pixels_to_gl(int x) const {
 605                         return (x * 2.0f / _canvas_size.GetWidth()) - 1.0f;
 606                 }
 607
 608                 /* @param y y position in pixels where 0 is top and canvas_height is bottom on screen */
 609                 float y_pixels_to_gl(int y) const {
 610                         return 1.0f - (y * 2.0f / _canvas_size.GetHeight());
 611                 }
 612
 613                 wxSize _canvas_size;
 614                 float _vertices[20];
 615         };
 616
 617         if (_last_canvas_size.changed() || _last_inter_position.changed() || _last_inter_size.changed() || _last_out_size.changed()) {
 618
 619                 const auto video = _optimise_for_j2k ?
 620                         Rectangle(canvas_size, inter_position.x + x_offset, inter_position.y + y_offset, inter_size)
 621                         : Rectangle(canvas_size, x_offset, y_offset, out_size);
 622
 623                 glBufferSubData (GL_ARRAY_BUFFER, 0, video.size(), video.vertices());
 624                 check_gl_error ("glBufferSubData (video)");
 625
 626                 const auto border = Rectangle(canvas_size, inter_position.x + x_offset, inter_position.y + y_offset, inter_size);
 627                 glBufferSubData (GL_ARRAY_BUFFER, 8 * 5 * sizeof(float), border.size(), border.vertices());
 628                 check_gl_error ("glBufferSubData (border)");
 629         }
 630
 631         if (_have_subtitle_to_render) {
 632                 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());
 633                 glBufferSubData (GL_ARRAY_BUFFER, 4 * 5 * sizeof(float), subtitle.size(), subtitle.vertices());
 634                 check_gl_error ("glBufferSubData (subtitle)");
 635         }
 636
 637         /* opt: where should these go? */
 638
 639         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 640         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 641         check_gl_error ("glTexParameteri");
 642
 643         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 644         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 645         check_gl_error ("glTexParameterf");
 646 }
 647
 648
 649 void
 650 GLVideoView::start ()
 651 {
 652         VideoView::start ();
 653
 654         boost::mutex::scoped_lock lm (_playing_mutex);
 655         _playing = true;
 656         _thread_work_condition.notify_all ();
 657 }
 658
 659 void
 660 GLVideoView::stop ()
 661 {
 662         boost::mutex::scoped_lock lm (_playing_mutex);
 663         _playing = false;
 664 }
 665
 666
 667 void
 668 GLVideoView::thread_playing ()
 669 {
 670         if (length() != dcpomatic::DCPTime()) {
 671                 auto const next = position() + one_video_frame();
 672
 673                 if (next >= length()) {
 674                         _viewer->finished ();
 675                         return;
 676                 }
 677
 678                 get_next_frame (false);
 679                 set_image_and_draw ();
 680         }
 681
 682         while (true) {
 683                 optional<int> n = time_until_next_frame();
 684                 if (!n || *n > 5) {
 685                         break;
 686                 }
 687                 get_next_frame (true);
 688                 add_dropped ();
 689         }
 690 }
 691
 692
 693 void
 694 GLVideoView::set_image_and_draw ()
 695 {
 696         auto pv = player_video().first;
 697         if (pv) {
 698                 set_image (pv);
 699         }
 700
 701         draw ();
 702
 703         if (pv) {
 704                 _viewer->image_changed (pv);
 705         }
 706 }
 707
 708
 709 void
 710 GLVideoView::thread ()
 711 try
 712 {
 713         start_of_thread ("GLVideoView");
 714
 715 #if defined(DCPOMATIC_OSX)
 716         /* Without this we see errors like
 717          * ../src/osx/cocoa/glcanvas.mm(194): assert ""context"" failed in SwapBuffers(): should have current context [in thread 700006970000]
 718          */
 719         WXGLSetCurrentContext (_context->GetWXGLContext());
 720 #else
 721         if (!_setup_shaders_done) {
 722                 setup_shaders ();
 723                 _setup_shaders_done = true;
 724         }
 725 #endif
 726
 727 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
 728         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
 729                 /* Enable vsync */
 730                 Display* dpy = wxGetX11Display();
 731                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
 732                 _vsync_enabled = true;
 733         }
 734 #endif
 735
 736 #ifdef DCPOMATIC_WINDOWS
 737         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
 738                 /* Enable vsync */
 739                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
 740                 if (swap) {
 741                         swap (1);
 742                         _vsync_enabled = true;
 743                 }
 744         }
 745
 746 #endif
 747
 748 #ifdef DCPOMATIC_OSX
 749         /* Enable vsync */
 750         GLint swapInterval = 1;
 751         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
 752         _vsync_enabled = true;
 753 #endif
 754
 755         _video_texture.reset(new Texture(_optimise_for_j2k ? 2 : 1));
 756         _subtitle_texture.reset(new Texture(1));
 757
 758         while (true) {
 759                 boost::mutex::scoped_lock lm (_playing_mutex);
 760                 while (!_playing && !_one_shot) {
 761                         _thread_work_condition.wait (lm);
 762                 }
 763                 lm.unlock ();
 764
 765                 if (_playing) {
 766                         thread_playing ();
 767                 } else if (_one_shot) {
 768                         _one_shot = false;
 769                         set_image_and_draw ();
 770                 }
 771
 772                 boost::this_thread::interruption_point ();
 773                 dcpomatic_sleep_milliseconds (time_until_next_frame().get_value_or(0));
 774         }
 775
 776         /* XXX: leaks _context, but that seems preferable to deleting it here
 777          * without also deleting the wxGLCanvas.
 778          */
 779 }
 780 catch (...)
 781 {
 782         store_current ();
 783 }
 784
 785
 786 VideoView::NextFrameResult
 787 GLVideoView::display_next_frame (bool non_blocking)
 788 {
 789         NextFrameResult const r = get_next_frame (non_blocking);
 790         request_one_shot ();
 791         return r;
 792 }
 793
 794
 795 void
 796 GLVideoView::request_one_shot ()
 797 {
 798         boost::mutex::scoped_lock lm (_playing_mutex);
 799         _one_shot = true;
 800         _thread_work_condition.notify_all ();
 801 }
 802
 803
 804 Texture::Texture (GLint unpack_alignment)
 805         : _unpack_alignment (unpack_alignment)
 806 {
 807         glGenTextures (1, &_name);
 808         check_gl_error ("glGenTextures");
 809 }
 810
 811
 812 Texture::~Texture ()
 813 {
 814         glDeleteTextures (1, &_name);
 815 }
 816
 817
 818 void
 819 Texture::bind ()
 820 {
 821         glBindTexture(GL_TEXTURE_2D, _name);
 822         check_gl_error ("glBindTexture");
 823 }
 824
 825
 826 void
 827 Texture::set (shared_ptr<const Image> image)
 828 {
 829         auto const create = !_size || image->size() != _size;
 830         _size = image->size();
 831
 832         glPixelStorei (GL_UNPACK_ALIGNMENT, _unpack_alignment);
 833         check_gl_error ("glPixelStorei");
 834
 835         DCPOMATIC_ASSERT (image->alignment() == Image::Alignment::COMPACT);
 836
 837         GLint internal_format;
 838         GLenum format;
 839         GLenum type;
 840
 841         switch (image->pixel_format()) {
 842         case AV_PIX_FMT_BGRA:
 843                 internal_format = GL_RGBA8;
 844                 format = GL_BGRA;
 845                 type = GL_UNSIGNED_BYTE;
 846                 break;
 847         case AV_PIX_FMT_RGBA:
 848                 internal_format = GL_RGBA8;
 849                 format = GL_RGBA;
 850                 type = GL_UNSIGNED_BYTE;
 851                 break;
 852         case AV_PIX_FMT_RGB24:
 853                 internal_format = GL_RGBA8;
 854                 format = GL_RGB;
 855                 type = GL_UNSIGNED_BYTE;
 856                 break;
 857         case AV_PIX_FMT_XYZ12:
 858                 internal_format = GL_RGBA12;
 859                 format = GL_RGB;
 860                 type = GL_UNSIGNED_SHORT;
 861                 break;
 862         default:
 863                 throw PixelFormatError ("Texture::set", image->pixel_format());
 864         }
 865
 866         bind ();
 867
 868         if (create) {
 869                 glTexImage2D (GL_TEXTURE_2D, 0, internal_format, _size->width, _size->height, 0, format, type, image->data()[0]);
 870                 check_gl_error ("glTexImage2D");
 871         } else {
 872                 glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, _size->width, _size->height, format, type, image->data()[0]);
 873                 check_gl_error ("glTexSubImage2D");
 874         }
 875 }
 876
 877 #endif