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/butler.h"
  34 #include "lib/cross.h"
  35 #include "lib/dcpomatic_assert.h"
  36 #include "lib/dcpomatic_log.h"
  37 #include "lib/exceptions.h"
  38 #include "lib/image.h"
  39 #include "lib/player_video.h"
  40 #include <boost/bind/bind.hpp>
  41 #include <iostream>
  42
  43 #ifdef DCPOMATIC_OSX
  44 #define GL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED
  45 #include <OpenGL/OpenGL.h>
  46 #include <OpenGL/gl3.h>
  47 #endif
  48
  49 #ifdef DCPOMATIC_LINUX
  50 #include <GL/glu.h>
  51 #include <GL/glext.h>
  52 #endif
  53
  54 #ifdef DCPOMATIC_WINDOWS
  55 #include <GL/glu.h>
  56 #include <GL/wglext.h>
  57 #endif
  58
  59
  60 using std::cout;
  61 using std::shared_ptr;
  62 using std::string;
  63 using boost::optional;
  64 #if BOOST_VERSION >= 106100
  65 using namespace boost::placeholders;
  66 #endif
  67
  68
  69 static void
  70 check_gl_error (char const * last)
  71 {
  72         GLenum const e = glGetError ();
  73         if (e != GL_NO_ERROR) {
  74                 throw GLError (last, e);
  75         }
  76 }
  77
  78
  79 GLVideoView::GLVideoView (FilmViewer* viewer, wxWindow *parent)
  80         : VideoView (viewer)
  81         , _context (nullptr)
  82         , _vsync_enabled (false)
  83         , _playing (false)
  84         , _one_shot (false)
  85 {
  86         wxGLAttributes attributes;
  87         /* We don't need a depth buffer, and indeed there is apparently a bug with Windows/Intel HD 630
  88          * which puts green lines over the OpenGL display if you have a non-zero depth buffer size.
  89          * https://community.intel.com/t5/Graphics/Request-for-details-on-Intel-HD-630-green-lines-in-OpenGL-apps/m-p/1202179
  90          */
  91         attributes.PlatformDefaults().MinRGBA(8, 8, 8, 8).DoubleBuffer().Depth(0).EndList();
  92         _canvas = new wxGLCanvas (
  93                 parent, attributes, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE
  94         );
  95         _canvas->Bind (wxEVT_PAINT, boost::bind(&GLVideoView::update, this));
  96         _canvas->Bind (wxEVT_SIZE, boost::bind(&GLVideoView::size_changed, this, _1));
  97
  98         _canvas->Bind (wxEVT_TIMER, boost::bind(&GLVideoView::check_for_butler_errors, this));
  99         _timer.reset (new wxTimer(_canvas));
 100         _timer->Start (2000);
 101 }
 102
 103
 104 void
 105 GLVideoView::size_changed (wxSizeEvent const& ev)
 106 {
 107         auto const scale = _canvas->GetDPIScaleFactor();
 108         int const width = std::round(ev.GetSize().GetWidth() * scale);
 109         int const height = std::round(ev.GetSize().GetHeight() * scale);
 110         _canvas_size = { width, height };
 111         LOG_GENERAL("GLVideoView canvas size changed to %1x%2", width, height);
 112         Sized ();
 113 }
 114
 115
 116 GLVideoView::~GLVideoView ()
 117 {
 118         boost::this_thread::disable_interruption dis;
 119
 120         try {
 121                 _thread.interrupt ();
 122                 _thread.join ();
 123         } catch (...) {}
 124 }
 125
 126 void
 127 GLVideoView::check_for_butler_errors ()
 128 {
 129         if (!_viewer->butler()) {
 130                 return;
 131         }
 132
 133         try {
 134                 _viewer->butler()->rethrow ();
 135         } catch (DecodeError& e) {
 136                 error_dialog (get(), e.what());
 137         } catch (dcp::ReadError& e) {
 138                 error_dialog (get(), wxString::Format(_("Could not read DCP: %s"), std_to_wx(e.what())));
 139         }
 140 }
 141
 142
 143 /** Called from the UI thread */
 144 void
 145 GLVideoView::update ()
 146 {
 147         if (!_canvas->IsShownOnScreen()) {
 148                 return;
 149         }
 150
 151         /* It appears important to do this from the GUI thread; if we do it from the GL thread
 152          * on Linux we get strange failures to create the context for any version of GL higher
 153          * than 3.2.
 154          */
 155         ensure_context ();
 156
 157 #ifdef DCPOMATIC_OSX
 158         /* macOS gives errors if we don't do this (and therefore [NSOpenGLContext setView:]) from the main thread */
 159         if (!_setup_shaders_done) {
 160                 setup_shaders ();
 161                 _setup_shaders_done = true;
 162         }
 163 #endif
 164
 165         if (!_thread.joinable()) {
 166                 _thread = boost::thread (boost::bind(&GLVideoView::thread, this));
 167         }
 168
 169         request_one_shot ();
 170
 171         rethrow ();
 172 }
 173
 174
 175 static constexpr char vertex_source[] =
 176 "#version 330 core\n"
 177 "\n"
 178 "layout (location = 0) in vec3 in_pos;\n"
 179 "layout (location = 1) in vec2 in_tex_coord;\n"
 180 "\n"
 181 "out vec2 TexCoord;\n"
 182 "\n"
 183 "void main()\n"
 184 "{\n"
 185 "       gl_Position = vec4(in_pos, 1.0);\n"
 186 "       TexCoord = in_tex_coord;\n"
 187 "}\n";
 188
 189
 190 /* Bicubic interpolation stolen from https://stackoverflow.com/questions/13501081/efficient-bicubic-filtering-code-in-glsl */
 191 static constexpr char fragment_source[] =
 192 "#version 330 core\n"
 193 "\n"
 194 "in vec2 TexCoord;\n"
 195 "\n"
 196 "uniform sampler2D texture_sampler;\n"
 197 /* type = 0: draw border
 198  * type = 1: draw XYZ image
 199  * type = 2: draw RGB image
 200  */
 201 "uniform int type = 0;\n"
 202 "uniform vec4 border_colour;\n"
 203 "uniform mat4 colour_conversion;\n"
 204 "\n"
 205 "out vec4 FragColor;\n"
 206 "\n"
 207 "vec4 cubic(float x)\n"
 208 "\n"
 209 "#define IN_GAMMA 2.2\n"
 210 "#define OUT_GAMMA 0.384615385\n"       //  1 /  2.6
 211 "#define DCI_COEFFICIENT 0.91655528\n"  // 48 / 53.37
 212 "\n"
 213 "{\n"
 214 "    float x2 = x * x;\n"
 215 "    float x3 = x2 * x;\n"
 216 "    vec4 w;\n"
 217 "    w.x =     -x3 + 3 * x2 - 3 * x + 1;\n"
 218 "    w.y =  3 * x3 - 6 * x2         + 4;\n"
 219 "    w.z = -3 * x3 + 3 * x2 + 3 * x + 1;\n"
 220 "    w.w =  x3;\n"
 221 "    return w / 6.f;\n"
 222 "}\n"
 223 "\n"
 224 "vec4 texture_bicubic(sampler2D sampler, vec2 tex_coords)\n"
 225 "{\n"
 226 "   vec2 tex_size = textureSize(sampler, 0);\n"
 227 "   vec2 inv_tex_size = 1.0 / tex_size;\n"
 228 "\n"
 229 "   tex_coords = tex_coords * tex_size - 0.5;\n"
 230 "\n"
 231 "   vec2 fxy = fract(tex_coords);\n"
 232 "   tex_coords -= fxy;\n"
 233 "\n"
 234 "   vec4 xcubic = cubic(fxy.x);\n"
 235 "   vec4 ycubic = cubic(fxy.y);\n"
 236 "\n"
 237 "   vec4 c = tex_coords.xxyy + vec2 (-0.5, +1.5).xyxy;\n"
 238 "\n"
 239 "   vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);\n"
 240 "   vec4 offset = c + vec4 (xcubic.yw, ycubic.yw) / s;\n"
 241 "\n"
 242 "   offset *= inv_tex_size.xxyy;\n"
 243 "\n"
 244 "   vec4 sample0 = texture(sampler, offset.xz);\n"
 245 "   vec4 sample1 = texture(sampler, offset.yz);\n"
 246 "   vec4 sample2 = texture(sampler, offset.xw);\n"
 247 "   vec4 sample3 = texture(sampler, offset.yw);\n"
 248 "\n"
 249 "   float sx = s.x / (s.x + s.y);\n"
 250 "   float sy = s.z / (s.z + s.w);\n"
 251 "\n"
 252 "   return mix(\n"
 253 "          mix(sample3, sample2, sx), mix(sample1, sample0, sx)\n"
 254 "          , sy);\n"
 255 "}\n"
 256 "\n"
 257 "void main()\n"
 258 "{\n"
 259 "       switch (type) {\n"
 260 "               case 0:\n"
 261 "                       FragColor = border_colour;\n"
 262 "                       break;\n"
 263 "               case 1:\n"
 264 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 265 "                       FragColor.x = pow(FragColor.x, IN_GAMMA) / DCI_COEFFICIENT;\n"
 266 "                       FragColor.y = pow(FragColor.y, IN_GAMMA) / DCI_COEFFICIENT;\n"
 267 "                       FragColor.z = pow(FragColor.z, IN_GAMMA) / DCI_COEFFICIENT;\n"
 268 "                       FragColor = colour_conversion * FragColor;\n"
 269 "                       FragColor.x = pow(FragColor.x, OUT_GAMMA);\n"
 270 "                       FragColor.y = pow(FragColor.y, OUT_GAMMA);\n"
 271 "                       FragColor.z = pow(FragColor.z, OUT_GAMMA);\n"
 272 "                       break;\n"
 273 "               case 2:\n"
 274 "                       FragColor = texture_bicubic(texture_sampler, TexCoord);\n"
 275 "                       break;\n"
 276 "       }\n"
 277 "}\n";
 278
 279
 280 void
 281 GLVideoView::ensure_context ()
 282 {
 283         if (!_context) {
 284                 wxGLContextAttrs attrs;
 285                 attrs.PlatformDefaults().CoreProfile().OGLVersion(4, 1).EndList();
 286                 _context = new wxGLContext (_canvas, nullptr, &attrs);
 287                 if (!_context->IsOK()) {
 288                         throw GLError ("Making GL context", -1);
 289                 }
 290         }
 291 }
 292
 293
 294 /* Offset of video texture triangles in indices */
 295 static constexpr int indices_video_texture = 0;
 296 /* Offset of subtitle texture triangles in indices */
 297 static constexpr int indices_subtitle_texture = 6;
 298 /* Offset of border lines in indices */
 299 static constexpr int indices_border = 12;
 300
 301 static constexpr unsigned int indices[] = {
 302         0, 1, 3, // video texture triangle #1
 303         1, 2, 3, // video texture triangle #2
 304         4, 5, 7, // subtitle texture triangle #1
 305         5, 6, 7, // subtitle texture triangle #2
 306         8, 9,    // border line #1
 307         9, 10,   // border line #2
 308         10, 11,  // border line #3
 309         11, 8,   // border line #4
 310 };
 311
 312
 313 void
 314 GLVideoView::setup_shaders ()
 315 {
 316         DCPOMATIC_ASSERT (_canvas);
 317         DCPOMATIC_ASSERT (_context);
 318         auto r = _canvas->SetCurrent (*_context);
 319         DCPOMATIC_ASSERT (r);
 320
 321 #ifdef DCPOMATIC_WINDOWS
 322         r = glewInit();
 323         if (r != GLEW_OK) {
 324                 throw GLError(reinterpret_cast<char const*>(glewGetErrorString(r)));
 325         }
 326 #endif
 327
 328         auto get_information = [this](GLenum name) {
 329                 auto s = glGetString (name);
 330                 if (s) {
 331                         _information[name] = std::string (reinterpret_cast<char const *>(s));
 332                 }
 333         };
 334
 335         get_information (GL_VENDOR);
 336         get_information (GL_RENDERER);
 337         get_information (GL_VERSION);
 338         get_information (GL_SHADING_LANGUAGE_VERSION);
 339
 340         glGenVertexArrays(1, &_vao);
 341         check_gl_error ("glGenVertexArrays");
 342         GLuint vbo;
 343         glGenBuffers(1, &vbo);
 344         check_gl_error ("glGenBuffers");
 345         GLuint ebo;
 346         glGenBuffers(1, &ebo);
 347         check_gl_error ("glGenBuffers");
 348
 349         glBindVertexArray(_vao);
 350         check_gl_error ("glBindVertexArray");
 351
 352         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 353         check_gl_error ("glBindBuffer");
 354
 355         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
 356         check_gl_error ("glBindBuffer");
 357         glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
 358         check_gl_error ("glBufferData");
 359
 360         /* position attribute to vertex shader (location = 0) */
 361         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), nullptr);
 362         glEnableVertexAttribArray(0);
 363         /* texture coord attribute to vertex shader (location = 1) */
 364         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), reinterpret_cast<void*>(3 * sizeof(float)));
 365         glEnableVertexAttribArray(1);
 366         check_gl_error ("glEnableVertexAttribArray");
 367
 368         auto compile = [](GLenum type, char const* source) -> GLuint {
 369                 auto shader = glCreateShader(type);
 370                 DCPOMATIC_ASSERT (shader);
 371                 GLchar const * src[] = { static_cast<GLchar const *>(source) };
 372                 glShaderSource(shader, 1, src, nullptr);
 373                 check_gl_error ("glShaderSource");
 374                 glCompileShader(shader);
 375                 check_gl_error ("glCompileShader");
 376                 GLint ok;
 377                 glGetShaderiv(shader, GL_COMPILE_STATUS, &ok);
 378                 if (!ok) {
 379                         GLint log_length;
 380                         glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_length);
 381                         string log;
 382                         if (log_length > 0) {
 383                                 char* log_char = new char[log_length];
 384                                 glGetShaderInfoLog(shader, log_length, nullptr, log_char);
 385                                 log = string(log_char);
 386                                 delete[] log_char;
 387                         }
 388                         glDeleteShader(shader);
 389                         throw GLError(String::compose("Could not compile shader (%1)", log).c_str(), -1);
 390                 }
 391                 return shader;
 392         };
 393
 394         auto vertex_shader = compile (GL_VERTEX_SHADER, vertex_source);
 395         auto fragment_shader = compile (GL_FRAGMENT_SHADER, fragment_source);
 396
 397         auto program = glCreateProgram();
 398         check_gl_error ("glCreateProgram");
 399         glAttachShader (program, vertex_shader);
 400         check_gl_error ("glAttachShader");
 401         glAttachShader (program, fragment_shader);
 402         check_gl_error ("glAttachShader");
 403         glLinkProgram (program);
 404         check_gl_error ("glLinkProgram");
 405         GLint ok;
 406         glGetProgramiv (program, GL_LINK_STATUS, &ok);
 407         if (!ok) {
 408                 GLint log_length;
 409                 glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_length);
 410                 string log;
 411                 if (log_length > 0) {
 412                         char* log_char = new char[log_length];
 413                         glGetProgramInfoLog(program, log_length, nullptr, log_char);
 414                         log = string(log_char);
 415                         delete[] log_char;
 416                 }
 417                 glDeleteProgram (program);
 418                 throw GLError(String::compose("Could not link shader (%1)", log).c_str(), -1);
 419         }
 420         glDeleteShader (vertex_shader);
 421         glDeleteShader (fragment_shader);
 422
 423         glUseProgram (program);
 424
 425         _fragment_type = glGetUniformLocation (program, "type");
 426         check_gl_error ("glGetUniformLocation");
 427         set_border_colour (program);
 428
 429         auto conversion = dcp::ColourConversion::rec709_to_xyz();
 430         boost::numeric::ublas::matrix<double> matrix = conversion.xyz_to_rgb ();
 431         GLfloat gl_matrix[] = {
 432                 static_cast<float>(matrix(0, 0)), static_cast<float>(matrix(0, 1)), static_cast<float>(matrix(0, 2)), 0.0f,
 433                 static_cast<float>(matrix(1, 0)), static_cast<float>(matrix(1, 1)), static_cast<float>(matrix(1, 2)), 0.0f,
 434                 static_cast<float>(matrix(2, 0)), static_cast<float>(matrix(2, 1)), static_cast<float>(matrix(2, 2)), 0.0f,
 435                 0.0f, 0.0f, 0.0f, 1.0f
 436                 };
 437
 438         auto colour_conversion = glGetUniformLocation (program, "colour_conversion");
 439         check_gl_error ("glGetUniformLocation");
 440         glUniformMatrix4fv (colour_conversion, 1, GL_TRUE, gl_matrix);
 441
 442         glLineWidth (1.0f);
 443         check_gl_error ("glLineWidth");
 444         glEnable (GL_BLEND);
 445         check_gl_error ("glEnable");
 446         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 447         check_gl_error ("glBlendFunc");
 448
 449         /* Reserve space for the GL_ARRAY_BUFFER */
 450         glBufferData(GL_ARRAY_BUFFER, 12 * 5 * sizeof(float), nullptr, GL_STATIC_DRAW);
 451         check_gl_error ("glBufferData");
 452 }
 453
 454
 455 void
 456 GLVideoView::set_border_colour (GLuint program)
 457 {
 458         auto uniform = glGetUniformLocation (program, "border_colour");
 459         check_gl_error ("glGetUniformLocation");
 460         auto colour = outline_content_colour ();
 461         glUniform4f (uniform, colour.Red() / 255.0f, colour.Green() / 255.0f, colour.Blue() / 255.0f, 1.0f);
 462         check_gl_error ("glUniform4f");
 463 }
 464
 465
 466 void
 467 GLVideoView::draw ()
 468 {
 469         auto pad = pad_colour();
 470         glClearColor(pad.Red() / 255.0, pad.Green() / 255.0, pad.Blue() / 255.0, 1.0);
 471         glClear (GL_COLOR_BUFFER_BIT);
 472         check_gl_error ("glClear");
 473
 474         auto const size = _canvas_size.load();
 475         int const width = size.GetWidth();
 476         int const height = size.GetHeight();
 477
 478         if (width < 64 || height < 0) {
 479                 return;
 480         }
 481
 482         glViewport (0, 0, width, height);
 483         check_gl_error ("glViewport");
 484
 485         glBindVertexArray(_vao);
 486         check_gl_error ("glBindVertexArray");
 487         glUniform1i(_fragment_type, _optimise_for_j2k ? 1 : 2);
 488         _video_texture->bind();
 489         glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_video_texture * sizeof(int)));
 490         if (_have_subtitle_to_render) {
 491                 glUniform1i(_fragment_type, 2);
 492                 _subtitle_texture->bind();
 493                 glDrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_subtitle_texture * sizeof(int)));
 494         }
 495         if (_viewer->outline_content()) {
 496                 glUniform1i(_fragment_type, 0);
 497                 glDrawElements (GL_LINES, 8, GL_UNSIGNED_INT, reinterpret_cast<void*>(indices_border * sizeof(int)));
 498                 check_gl_error ("glDrawElements");
 499         }
 500
 501         glFlush();
 502         check_gl_error ("glFlush");
 503
 504         _canvas->SwapBuffers();
 505 }
 506
 507
 508 void
 509 GLVideoView::set_image (shared_ptr<const PlayerVideo> pv)
 510 {
 511         shared_ptr<const Image> video = _optimise_for_j2k ? pv->raw_image() : pv->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), VideoRange::FULL, true);
 512
 513         /* Only the player's black frames should be aligned at this stage, so this should
 514          * almost always have no work to do.
 515          */
 516         video = Image::ensure_alignment (video, Image::Alignment::COMPACT);
 517
 518         /** If _optimise_for_j2k is true we render a XYZ image, doing the colourspace
 519          *  conversion, scaling and video range conversion in the GL shader.
 520          *  Othewise we render a RGB image without any shader-side processing.
 521          */
 522
 523         /* XXX: video range conversion */
 524
 525         _video_texture->set (video);
 526
 527         auto const text = pv->text();
 528         _have_subtitle_to_render = static_cast<bool>(text) && _optimise_for_j2k;
 529         if (_have_subtitle_to_render) {
 530                 /* opt: only do this if it's a new subtitle? */
 531                 DCPOMATIC_ASSERT (text->image->alignment() == Image::Alignment::COMPACT);
 532                 _subtitle_texture->set (text->image);
 533         }
 534
 535
 536         auto const canvas_size = _canvas_size.load();
 537         int const canvas_width = canvas_size.GetWidth();
 538         int const canvas_height = canvas_size.GetHeight();
 539         auto const inter_position = player_video().first->inter_position();
 540         auto const inter_size = player_video().first->inter_size();
 541         auto const out_size = player_video().first->out_size();
 542
 543         auto x_offset = std::max(0, (canvas_width - out_size.width) / 2);
 544         auto y_offset = std::max(0, (canvas_height - out_size.height) / 2);
 545
 546         _last_canvas_size.set_next (canvas_size);
 547         _last_video_size.set_next (video->size());
 548         _last_inter_position.set_next (inter_position);
 549         _last_inter_size.set_next (inter_size);
 550         _last_out_size.set_next (out_size);
 551
 552         class Rectangle
 553         {
 554         public:
 555                 Rectangle (wxSize canvas_size, float x, float y, dcp::Size size)
 556                         : _canvas_size (canvas_size)
 557                 {
 558                         auto const x1 = x_pixels_to_gl(x);
 559                         auto const y1 = y_pixels_to_gl(y);
 560                         auto const x2 = x_pixels_to_gl(x + size.width);
 561                         auto const y2 = y_pixels_to_gl(y + size.height);
 562
 563                         /* The texture coordinates here have to account for the fact that when we put images into the texture OpenGL
 564                          * expected us to start at the lower left but we actually started at the top left.  So although the
 565                          * top of the texture is at 1.0 we pretend it's the other way round.
 566                          */
 567
 568                         // bottom right
 569                         _vertices[0] = x2;
 570                         _vertices[1] = y2;
 571                         _vertices[2] = 0.0f;
 572                         _vertices[3] = 1.0f;
 573                         _vertices[4] = 1.0f;
 574
 575                         // top right
 576                         _vertices[5] = x2;
 577                         _vertices[6] = y1;
 578                         _vertices[7] = 0.0f;
 579                         _vertices[8] = 1.0f;
 580                         _vertices[9] = 0.0f;
 581
 582                         // top left
 583                         _vertices[10] = x1;
 584                         _vertices[11] = y1;
 585                         _vertices[12] = 0.0f;
 586                         _vertices[13] = 0.0f;
 587                         _vertices[14] = 0.0f;
 588
 589                         // bottom left
 590                         _vertices[15] = x1;
 591                         _vertices[16] = y2;
 592                         _vertices[17] = 0.0f;
 593                         _vertices[18] = 0.0f;
 594                         _vertices[19] = 1.0f;
 595                 }
 596
 597                 float const * vertices () const {
 598                         return _vertices;
 599                 }
 600
 601                 int const size () const {
 602                         return sizeof(_vertices);
 603                 }
 604
 605         private:
 606                 /* @param x x position in pixels where 0 is left and canvas_width is right on screen */
 607                 float x_pixels_to_gl(int x) const {
 608                         return (x * 2.0f / _canvas_size.GetWidth()) - 1.0f;
 609                 }
 610
 611                 /* @param y y position in pixels where 0 is top and canvas_height is bottom on screen */
 612                 float y_pixels_to_gl(int y) const {
 613                         return 1.0f - (y * 2.0f / _canvas_size.GetHeight());
 614                 }
 615
 616                 wxSize _canvas_size;
 617                 float _vertices[20];
 618         };
 619
 620         if (_last_canvas_size.changed() || _last_inter_position.changed() || _last_inter_size.changed() || _last_out_size.changed()) {
 621
 622                 const auto video = _optimise_for_j2k ?
 623                         Rectangle(canvas_size, inter_position.x + x_offset, inter_position.y + y_offset, inter_size)
 624                         : Rectangle(canvas_size, x_offset, y_offset, out_size);
 625
 626                 glBufferSubData (GL_ARRAY_BUFFER, 0, video.size(), video.vertices());
 627                 check_gl_error ("glBufferSubData (video)");
 628
 629                 const auto border = Rectangle(canvas_size, inter_position.x + x_offset, inter_position.y + y_offset, inter_size);
 630                 glBufferSubData (GL_ARRAY_BUFFER, 8 * 5 * sizeof(float), border.size(), border.vertices());
 631                 check_gl_error ("glBufferSubData (border)");
 632         }
 633
 634         if (_have_subtitle_to_render) {
 635                 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());
 636                 glBufferSubData (GL_ARRAY_BUFFER, 4 * 5 * sizeof(float), subtitle.size(), subtitle.vertices());
 637                 check_gl_error ("glBufferSubData (subtitle)");
 638         }
 639
 640         /* opt: where should these go? */
 641
 642         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 643         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 644         check_gl_error ("glTexParameteri");
 645
 646         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 647         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 648         check_gl_error ("glTexParameterf");
 649 }
 650
 651
 652 void
 653 GLVideoView::start ()
 654 {
 655         VideoView::start ();
 656
 657         boost::mutex::scoped_lock lm (_playing_mutex);
 658         _playing = true;
 659         _thread_work_condition.notify_all ();
 660 }
 661
 662 void
 663 GLVideoView::stop ()
 664 {
 665         boost::mutex::scoped_lock lm (_playing_mutex);
 666         _playing = false;
 667 }
 668
 669
 670 void
 671 GLVideoView::thread_playing ()
 672 {
 673         if (length() != dcpomatic::DCPTime()) {
 674                 auto const next = position() + one_video_frame();
 675
 676                 if (next >= length()) {
 677                         _viewer->finished ();
 678                         return;
 679                 }
 680
 681                 get_next_frame (false);
 682                 set_image_and_draw ();
 683         }
 684
 685         while (true) {
 686                 optional<int> n = time_until_next_frame();
 687                 if (!n || *n > 5) {
 688                         break;
 689                 }
 690                 get_next_frame (true);
 691                 add_dropped ();
 692         }
 693 }
 694
 695
 696 void
 697 GLVideoView::set_image_and_draw ()
 698 {
 699         auto pv = player_video().first;
 700         if (pv) {
 701                 set_image (pv);
 702         }
 703
 704         draw ();
 705
 706         if (pv) {
 707                 _viewer->image_changed (pv);
 708         }
 709 }
 710
 711
 712 void
 713 GLVideoView::thread ()
 714 try
 715 {
 716         start_of_thread ("GLVideoView");
 717
 718 #if defined(DCPOMATIC_OSX)
 719         /* Without this we see errors like
 720          * ../src/osx/cocoa/glcanvas.mm(194): assert ""context"" failed in SwapBuffers(): should have current context [in thread 700006970000]
 721          */
 722         WXGLSetCurrentContext (_context->GetWXGLContext());
 723 #else
 724         if (!_setup_shaders_done) {
 725                 setup_shaders ();
 726                 _setup_shaders_done = true;
 727         }
 728 #endif
 729
 730 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
 731         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
 732                 /* Enable vsync */
 733                 Display* dpy = wxGetX11Display();
 734                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
 735                 _vsync_enabled = true;
 736         }
 737 #endif
 738
 739 #ifdef DCPOMATIC_WINDOWS
 740         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
 741                 /* Enable vsync */
 742                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
 743                 if (swap) {
 744                         swap (1);
 745                         _vsync_enabled = true;
 746                 }
 747         }
 748
 749 #endif
 750
 751 #ifdef DCPOMATIC_OSX
 752         /* Enable vsync */
 753         GLint swapInterval = 1;
 754         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
 755         _vsync_enabled = true;
 756 #endif
 757
 758         _video_texture.reset(new Texture(_optimise_for_j2k ? 2 : 1));
 759         _subtitle_texture.reset(new Texture(1));
 760
 761         while (true) {
 762                 boost::mutex::scoped_lock lm (_playing_mutex);
 763                 while (!_playing && !_one_shot) {
 764                         _thread_work_condition.wait (lm);
 765                 }
 766                 lm.unlock ();
 767
 768                 if (_playing) {
 769                         thread_playing ();
 770                 } else if (_one_shot) {
 771                         _one_shot = false;
 772                         set_image_and_draw ();
 773                 }
 774
 775                 boost::this_thread::interruption_point ();
 776                 dcpomatic_sleep_milliseconds (time_until_next_frame().get_value_or(0));
 777         }
 778
 779         /* XXX: leaks _context, but that seems preferable to deleting it here
 780          * without also deleting the wxGLCanvas.
 781          */
 782 }
 783 catch (...)
 784 {
 785         store_current ();
 786 }
 787
 788
 789 VideoView::NextFrameResult
 790 GLVideoView::display_next_frame (bool non_blocking)
 791 {
 792         NextFrameResult const r = get_next_frame (non_blocking);
 793         request_one_shot ();
 794         return r;
 795 }
 796
 797
 798 void
 799 GLVideoView::request_one_shot ()
 800 {
 801         boost::mutex::scoped_lock lm (_playing_mutex);
 802         _one_shot = true;
 803         _thread_work_condition.notify_all ();
 804 }
 805
 806
 807 Texture::Texture (GLint unpack_alignment)
 808         : _unpack_alignment (unpack_alignment)
 809 {
 810         glGenTextures (1, &_name);
 811         check_gl_error ("glGenTextures");
 812 }
 813
 814
 815 Texture::~Texture ()
 816 {
 817         glDeleteTextures (1, &_name);
 818 }
 819
 820
 821 void
 822 Texture::bind ()
 823 {
 824         glBindTexture(GL_TEXTURE_2D, _name);
 825         check_gl_error ("glBindTexture");
 826 }
 827
 828
 829 void
 830 Texture::set (shared_ptr<const Image> image)
 831 {
 832         auto const create = !_size || image->size() != _size;
 833         _size = image->size();
 834
 835         glPixelStorei (GL_UNPACK_ALIGNMENT, _unpack_alignment);
 836         check_gl_error ("glPixelStorei");
 837
 838         DCPOMATIC_ASSERT (image->alignment() == Image::Alignment::COMPACT);
 839
 840         GLint internal_format;
 841         GLenum format;
 842         GLenum type;
 843
 844         switch (image->pixel_format()) {
 845         case AV_PIX_FMT_BGRA:
 846                 internal_format = GL_RGBA8;
 847                 format = GL_BGRA;
 848                 type = GL_UNSIGNED_BYTE;
 849                 break;
 850         case AV_PIX_FMT_RGBA:
 851                 internal_format = GL_RGBA8;
 852                 format = GL_RGBA;
 853                 type = GL_UNSIGNED_BYTE;
 854                 break;
 855         case AV_PIX_FMT_RGB24:
 856                 internal_format = GL_RGBA8;
 857                 format = GL_RGB;
 858                 type = GL_UNSIGNED_BYTE;
 859                 break;
 860         case AV_PIX_FMT_XYZ12:
 861                 internal_format = GL_RGBA12;
 862                 format = GL_RGB;
 863                 type = GL_UNSIGNED_SHORT;
 864                 break;
 865         default:
 866                 throw PixelFormatError ("Texture::set", image->pixel_format());
 867         }
 868
 869         bind ();
 870
 871         if (create) {
 872                 glTexImage2D (GL_TEXTURE_2D, 0, internal_format, _size->width, _size->height, 0, format, type, image->data()[0]);
 873                 check_gl_error ("glTexImage2D");
 874         } else {
 875                 glTexSubImage2D (GL_TEXTURE_2D, 0, 0, 0, _size->width, _size->height, format, type, image->data()[0]);
 876                 check_gl_error ("glTexSubImage2D");
 877         }
 878 }
 879
 880 #endif