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/*
Copyright (C) 2025 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "lib/cross.h"
#include "lib/dcpomatic_log.h"
#include "lib/exceptions.h"
#include "gl_view.h"
#include <wx/wx.h>
#if BOOST_VERSION >= 106100
using namespace boost::placeholders;
#endif
/* This will only build on an new-enough wxWidgets: see the comment in gl_view.h */
#if wxCHECK_VERSION(3,1,0)
GLView::GLView(wxWindow* parent)
: _context(nullptr)
, _vsync_enabled(false)
, _playing(false)
, _one_shot(false)
{
wxGLAttributes attributes;
/* We don't need a depth buffer, and indeed there is apparently a bug with Windows/Intel HD 630
* which puts green lines over the OpenGL display if you have a non-zero depth buffer size.
* https://community.intel.com/t5/Graphics/Request-for-details-on-Intel-HD-630-green-lines-in-OpenGL-apps/m-p/1202179
*/
attributes.PlatformDefaults().MinRGBA(8, 8, 8, 8).DoubleBuffer().Depth(0).EndList();
_canvas = new wxGLCanvas(
parent, attributes, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE
);
_canvas->Bind(wxEVT_SIZE, boost::bind(&GLView::size_changed, this, _1));
_canvas->Bind(wxEVT_PAINT, boost::bind(&GLView::update, this));
}
GLView::~GLView()
{
boost::this_thread::disable_interruption dis;
try {
_thread.interrupt();
_thread.join();
} catch (...) {}
}
void
GLView::size_changed(wxSizeEvent const& ev)
{
auto const scale = _canvas->GetDPIScaleFactor();
int const width = std::round(ev.GetSize().GetWidth() * scale);
int const height = std::round(ev.GetSize().GetHeight() * scale);
_canvas_size = { width, height };
LOG_GENERAL("GLView canvas size changed to %1x%2", width, height);
}
void
GLView::start_thread_if_required()
{
if (!_thread.joinable()) {
_thread = boost::thread(boost::bind(&GLView::thread, this));
}
}
void
GLView::thread()
try
{
thread_setup();
#if defined(DCPOMATIC_LINUX) && defined(DCPOMATIC_HAVE_GLX_SWAP_INTERVAL_EXT)
if (_canvas->IsExtensionSupported("GLX_EXT_swap_control")) {
/* Enable vsync */
Display* dpy = wxGetX11Display();
glXSwapIntervalEXT(dpy, DefaultScreen(dpy), 1);
_vsync_enabled = true;
}
#endif
#ifdef DCPOMATIC_WINDOWS
if (_canvas->IsExtensionSupported("WGL_EXT_swap_control")) {
/* Enable vsync */
PFNWGLSWAPINTERVALEXTPROC swap = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
if (swap) {
swap(1);
_vsync_enabled = true;
}
}
#endif
#ifdef DCPOMATIC_OSX
/* Enable vsync */
GLint swapInterval = 1;
CGLSetParameter(CGLGetCurrentContext(), kCGLCPSwapInterval, &swapInterval);
_vsync_enabled = true;
#endif
while (true) {
boost::mutex::scoped_lock lm(_playing_mutex);
while (!_playing && !_one_shot) {
_thread_work_condition.wait(lm);
}
lm.unlock();
if (_playing) {
thread_playing();
} else if (_one_shot) {
_one_shot = false;
draw();
}
boost::this_thread::interruption_point();
dcpomatic_sleep_milliseconds(time_until_next_frame().get_value_or(0));
}
}
catch (boost::thread_interrupted&)
{
}
catch (...)
{
store_current();
}
void
GLView::start()
{
boost::mutex::scoped_lock lm(_playing_mutex);
_playing = true;
_thread_work_condition.notify_all();
}
void
GLView::stop()
{
boost::mutex::scoped_lock lm(_playing_mutex);
_playing = false;
}
void
GLView::request_one_shot()
{
boost::mutex::scoped_lock lm(_playing_mutex);
_one_shot = true;
_thread_work_condition.notify_all();
}
void
GLView::update()
{
if (!_canvas->IsShownOnScreen()) {
return;
}
/* It appears important to do this from the GUI thread; if we do it from the GL thread
* on Linux we get strange failures to create the context for any version of GL higher
* than 3.2.
*/
ensure_context();
#ifdef DCPOMATIC_OSX
/* macOS gives errors if we don't do this (and therefore [NSOpenGLContext setView:]) from the main thread */
if (!_setup_shaders_done) {
setup_shaders();
_setup_shaders_done = true;
}
#endif
start_thread_if_required();
request_one_shot();
rethrow();
}
void
GLView::ensure_context()
{
if (!_context) {
wxGLContextAttrs attrs;
attrs.PlatformDefaults().CoreProfile().OGLVersion(4, 1).EndList();
_context = new wxGLContext(_canvas, nullptr, &attrs);
if (!_context->IsOK()) {
boost::throw_exception(GLError("Making GL context", -1));
}
}
}
#endif
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