#include "GSH_OpenGLQt.h"
#include <QWindow>
#include <QOpenGLContext>

CGSH_OpenGLQt::CGSH_OpenGLQt(QWindow* renderWindow)
: m_renderWindow(renderWindow)
{

}

CGSH_OpenGLQt::~CGSH_OpenGLQt()
{

}

CGSH_OpenGL::FactoryFunction CGSH_OpenGLQt::GetFactoryFunction(QWindow* renderWindow)
{
	return [renderWindow] () { return new CGSH_OpenGLQt(renderWindow); };
}

void CGSH_OpenGLQt::InitializeImpl()
{
    m_context = new QOpenGLContext();
    m_context->setFormat(m_renderWindow->requestedFormat());

    bool succeeded = m_context->create();
    Q_ASSERT(succeeded);

    succeeded = m_context->makeCurrent(m_renderWindow);
    Q_ASSERT(succeeded);

    glewExperimental = GL_TRUE;
    auto result = glewInit();
    Q_ASSERT(result == GLEW_OK);

    CGSH_OpenGL::InitializeImpl();
}

void CGSH_OpenGLQt::ReleaseImpl()
{
	CGSH_OpenGL::ReleaseImpl();

	delete m_context;
}

void CGSH_OpenGLQt::PresentBackbuffer()
{
    if (m_renderWindow->isExposed())
    {
        m_context->swapBuffers(m_renderWindow);
        m_context->makeCurrent(m_renderWindow);
    }
}