Don't try opening error dialogues from the GL thread.
[dcpomatic.git] / src / wx / gl_video_view.cc
1 /*
2     Copyright (C) 2018-2019 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 #include "gl_video_view.h"
22 #include "film_viewer.h"
23 #include "wx_util.h"
24 #include "lib/image.h"
25 #include "lib/dcpomatic_assert.h"
26 #include "lib/exceptions.h"
27 #include "lib/cross.h"
28 #include "lib/player_video.h"
29 #include "lib/butler.h"
30 #include <boost/bind.hpp>
31 #include <iostream>
32
33 #ifdef DCPOMATIC_OSX
34 #include <OpenGL/glu.h>
35 #include <OpenGL/glext.h>
36 #include <OpenGL/CGLTypes.h>
37 #include <OpenGL/OpenGL.h>
38 #endif
39
40 #ifdef DCPOMATIC_LINUX
41 #include <GL/glu.h>
42 #include <GL/glext.h>
43 #include <GL/glxext.h>
44 #endif
45
46 #ifdef DCPOMATIC_WINDOWS
47 #include <GL/glu.h>
48 #include <GL/glext.h>
49 #include <GL/wglext.h>
50 #endif
51
52 using std::cout;
53 using boost::shared_ptr;
54 using boost::optional;
55
56 GLVideoView::GLVideoView (FilmViewer* viewer, wxWindow *parent)
57         : VideoView (viewer)
58         , _vsync_enabled (false)
59         , _thread (0)
60         , _playing (false)
61         , _one_shot (false)
62 {
63         _canvas = new wxGLCanvas (parent, wxID_ANY, 0, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE);
64         _canvas->Bind (wxEVT_PAINT, boost::bind(&GLVideoView::paint, this));
65         _canvas->Bind (wxEVT_SIZE, boost::bind(boost::ref(Sized)));
66         _canvas->Bind (wxEVT_CREATE, boost::bind(&GLVideoView::create, this));
67
68         _canvas->Bind (wxEVT_TIMER, boost::bind(&GLVideoView::check_for_butler_errors, this));
69         _timer.reset (new wxTimer(_canvas));
70         _timer->Start (2000);
71
72 #if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
73         if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
74                 /* Enable vsync */
75                 Display* dpy = wxGetX11Display();
76                 glXSwapIntervalEXT (dpy, DefaultScreen(dpy), 1);
77                 _vsync_enabled = true;
78         }
79 #endif
80
81 #ifdef DCPOMATIC_WINDOWS
82         if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
83                 /* Enable vsync */
84                 PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
85                 if (swap) {
86                         swap (1);
87                         _vsync_enabled = true;
88                 }
89         }
90
91 #endif
92
93 #ifdef DCPOMATIC_OSX
94         /* Enable vsync */
95         GLint swapInterval = 1;
96         CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
97         _vsync_enabled = true;
98 #endif
99
100         glGenTextures (1, &_id);
101         glBindTexture (GL_TEXTURE_2D, _id);
102         glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
103 }
104
105 GLVideoView::~GLVideoView ()
106 {
107         _thread->interrupt ();
108         _thread->join ();
109         delete _thread;
110
111         glDeleteTextures (1, &_id);
112 }
113
114 void
115 GLVideoView::check_for_butler_errors ()
116 {
117         try {
118                 _viewer->butler()->rethrow ();
119         } catch (DecodeError& e) {
120                 error_dialog (get(), e.what());
121         }
122 }
123
124 static void
125 check_gl_error (char const * last)
126 {
127         GLenum const e = glGetError ();
128         if (e != GL_NO_ERROR) {
129                 throw GLError (last, e);
130         }
131 }
132
133 void
134 GLVideoView::paint ()
135 {
136         request_one_shot ();
137 }
138
139 void
140 GLVideoView::update ()
141 {
142         if (!_canvas->IsShownOnScreen()) {
143                 return;
144         }
145         /* XXX_b */
146 //      wxClientDC dc (_canvas);
147 //      draw ();
148 }
149
150 void
151 GLVideoView::draw ()
152 {
153         glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
154         check_gl_error ("glClear");
155
156         glClearColor (0.0f, 0.0f, 0.0f, 1.0f);
157         check_gl_error ("glClearColor");
158         glEnable (GL_TEXTURE_2D);
159         check_gl_error ("glEnable GL_TEXTURE_2D");
160         glEnable (GL_BLEND);
161         check_gl_error ("glEnable GL_BLEND");
162         glDisable (GL_DEPTH_TEST);
163         check_gl_error ("glDisable GL_DEPTH_TEST");
164         glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
165
166         if (_canvas->GetSize().x < 64 || _canvas->GetSize().y < 0) {
167                 return;
168         }
169
170         glViewport (0, 0, _canvas->GetSize().x, _canvas->GetSize().y);
171         check_gl_error ("glViewport");
172         glMatrixMode (GL_PROJECTION);
173         glLoadIdentity ();
174
175         gluOrtho2D (0, _canvas->GetSize().x, _canvas->GetSize().y, 0);
176         check_gl_error ("gluOrtho2d");
177         glMatrixMode (GL_MODELVIEW);
178         glLoadIdentity ();
179
180         glTranslatef (0, 0, 0);
181
182         dcp::Size const out_size = _viewer->out_size ();
183
184         if (_size) {
185                 /* Render our image (texture) */
186                 glBegin (GL_QUADS);
187                 glTexCoord2f (0, 1);
188                 glVertex2f (0, _size->height);
189                 glTexCoord2f (1, 1);
190                 glVertex2f (_size->width, _size->height);
191                 glTexCoord2f (1, 0);
192                 glVertex2f (_size->width, 0);
193                 glTexCoord2f (0, 0);
194                 glVertex2f (0, 0);
195                 glEnd ();
196         } else {
197                 /* No image, so just fill with black */
198                 glBegin (GL_QUADS);
199                 glColor3ub (0, 0, 0);
200                 glVertex2f (0, 0);
201                 glVertex2f (out_size.width, 0);
202                 glVertex2f (out_size.width, out_size.height);
203                 glVertex2f (0, out_size.height);
204                 glVertex2f (0, 0);
205                 glEnd ();
206         }
207
208         wxSize const canvas_size = _canvas->GetSize ();
209
210         if (!_viewer->pad_black() && out_size.width < canvas_size.GetWidth()) {
211                 glBegin (GL_QUADS);
212                 /* XXX: these colours are right for GNOME; may need adjusting for other OS */
213                 glColor3ub (240, 240, 240);
214                 glVertex2f (out_size.width, 0);
215                 glVertex2f (canvas_size.GetWidth(), 0);
216                 glVertex2f (canvas_size.GetWidth(), canvas_size.GetHeight());
217                 glVertex2f (out_size.width, canvas_size.GetHeight());
218                 glEnd ();
219                 glColor3ub (255, 255, 255);
220         }
221
222         if (!_viewer->pad_black() && out_size.height < canvas_size.GetHeight()) {
223                 glColor3ub (240, 240, 240);
224                 int const gap = (canvas_size.GetHeight() - out_size.height) / 2;
225                 glBegin (GL_QUADS);
226                 glVertex2f (0, 0);
227                 glVertex2f (canvas_size.GetWidth(), 0);
228                 glVertex2f (canvas_size.GetWidth(), gap);
229                 glVertex2f (0, gap);
230                 glEnd ();
231                 glBegin (GL_QUADS);
232                 glVertex2f (0, gap + out_size.height + 1);
233                 glVertex2f (canvas_size.GetWidth(), gap + out_size.height + 1);
234                 glVertex2f (canvas_size.GetWidth(), 2 * gap + out_size.height + 2);
235                 glVertex2f (0, 2 * gap + out_size.height + 2);
236                 glEnd ();
237                 glColor3ub (255, 255, 255);
238         }
239
240         if (_viewer->outline_content()) {
241                 glColor3ub (255, 0, 0);
242                 glBegin (GL_LINE_LOOP);
243                 Position<int> inter_position = _viewer->inter_position ();
244                 dcp::Size inter_size = _viewer->inter_size ();
245                 glVertex2f (inter_position.x, inter_position.y + (canvas_size.GetHeight() - out_size.height) / 2);
246                 glVertex2f (inter_position.x + inter_size.width, inter_position.y + (canvas_size.GetHeight() - out_size.height) / 2);
247                 glVertex2f (inter_position.x + inter_size.width, inter_position.y + (canvas_size.GetHeight() - out_size.height) / 2 + inter_size.height);
248                 glVertex2f (inter_position.x, inter_position.y + (canvas_size.GetHeight() - out_size.height) / 2 + inter_size.height);
249                 glEnd ();
250                 glColor3ub (255, 255, 255);
251         }
252
253         glFlush();
254         _canvas->SwapBuffers();
255 }
256
257 void
258 GLVideoView::set_image (shared_ptr<const Image> image)
259 {
260         if (!image) {
261                 _size = optional<dcp::Size>();
262                 return;
263         }
264
265         DCPOMATIC_ASSERT (image->pixel_format() == AV_PIX_FMT_RGB24);
266         DCPOMATIC_ASSERT (!image->aligned());
267
268         _size = image->size ();
269         glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
270         check_gl_error ("glPixelStorei");
271         glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB8, _size->width, _size->height, 0, GL_RGB, GL_UNSIGNED_BYTE, image->data()[0]);
272         check_gl_error ("glTexImage2D");
273
274         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
275         glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
276         check_gl_error ("glTexParameteri");
277
278         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
279         glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
280         check_gl_error ("glTexParameterf");
281 }
282
283 void
284 GLVideoView::start ()
285 {
286         boost::mutex::scoped_lock lm (_playing_mutex);
287         _playing = true;
288         _playing_condition.notify_all ();
289 }
290
291 void
292 GLVideoView::stop ()
293 {
294         boost::mutex::scoped_lock lm (_playing_mutex);
295         _playing = false;
296 }
297
298 void
299 GLVideoView::thread ()
300 try
301 {
302         /* XXX_b: check all calls and signal emissions in this method & protect them if necessary */
303         _context = new wxGLContext (_canvas);
304         _canvas->SetCurrent (*_context);
305
306         while (true) {
307                 boost::mutex::scoped_lock lm (_playing_mutex);
308                 while (!_playing && !_one_shot) {
309                         _playing_condition.wait (lm);
310                 }
311                 _one_shot = false;
312                 lm.unlock ();
313
314                 if (length() != dcpomatic::DCPTime()) {
315                         dcpomatic::DCPTime const next = position() + one_video_frame();
316
317                         if (next >= length()) {
318                                 _viewer->stop ();
319                                 _viewer->emit_finished ();
320                                 continue;
321                         }
322
323                         get_next_frame (false);
324                         set_image (player_video().first->image(bind(&PlayerVideo::force, _1, AV_PIX_FMT_RGB24), false, true));
325                 }
326                 draw ();
327
328                 while (time_until_next_frame() < 5) {
329                         get_next_frame (true);
330                 }
331
332                 boost::this_thread::interruption_point ();
333                 dcpomatic_sleep_milliseconds (time_until_next_frame());
334         }
335
336         delete _context;
337 }
338 catch (boost::thread_interrupted& e)
339 {
340         /* XXX_b: store exceptions here */
341         delete _context;
342         return;
343 }
344
345 bool
346 GLVideoView::display_next_frame (bool non_blocking)
347 {
348         bool const r = get_next_frame (non_blocking);
349         request_one_shot ();
350         return r;
351 }
352
353 void
354 GLVideoView::request_one_shot ()
355 {
356         boost::mutex::scoped_lock lm (_playing_mutex);
357         _one_shot = true;
358         _playing_condition.notify_all ();
359 }
360
361 void
362 GLVideoView::create ()
363 {
364         if (!_thread) {
365                 _thread = new boost::thread (boost::bind(&GLVideoView::thread, this));
366         }
367 }