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// Copyright (c) 2018, ETH Zurich and UNC Chapel Hill.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Author: Johannes L. Schoenberger (jsch at inf.ethz.ch)
#ifndef COLMAP_SRC_OPENGL_UTILS_H_
#define COLMAP_SRC_OPENGL_UTILS_H_
#include <QAction>
#include <QOffscreenSurface>
#include <QOpenGLContext>
#include <QThread>
#include <QWaitCondition>
#include "util/threading.h"
namespace colmap {
#ifdef DEBUG
#define glDebugLog() glError(__FILE__, __LINE__)
#else
#define glDebugLog()
#endif
// This class manages a thread-safe OpenGL context. Note that this class must be
// instantiated in the main Qt thread, since an OpenGL context must be created
// in it. The context can then be made current in any other thread.
class OpenGLContextManager : public QObject {
public:
OpenGLContextManager();
// Make the OpenGL context available by moving it from the thread where it was
// created to the current thread and making it current.
void MakeCurrent();
// Check whether the machine has OpenGL and we can create the context.
static bool HasOpenGL();
private:
QOffscreenSurface surface_;
QOpenGLContext context_;
QThread* parent_thread_;
QThread* current_thread_;
QAction* make_current_action_;
};
// Run and wait for the thread, that uses the OpenGLContextManager, e.g.:
//
// class TestThread : public Thread {
// private:
// void Run() { opengl_context_.MakeCurrent(); }
// OpenGLContextManager opengl_context_;
// };
// QApplication app(argc, argv);
// TestThread thread;
// RunThreadWithOpenGLContext(&thread);
//
void RunThreadWithOpenGLContext(Thread* thread);
// Get the OpenGL errors and print them to stderr.
void GLError(const char* file, const int line);
} // namespace colmap
#endif // COLMAP_SRC_OPENGL_UTILS_H_
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