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/*
* Copyright (C) 2013 Canonical, Ltd.
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3, as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
* SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Gerry Boland <gerry.boland@canonical.com>
*/
#include "miropenglcontext.h"
#include "displaywindow.h"
#include "mirserver.h"
#include "mirglconfig.h"
#include <QDebug>
#include <QSurfaceFormat>
#include <QtPlatformSupport/private/qeglconvenience_p.h>
// Mir
#include <mir/graphics/display.h>
#include <mir/graphics/gl_context.h>
// Qt supports one GL context per screen, but also shared contexts.
// The Mir "Display" generates a shared GL context for all DisplayBuffers
// (i.e. individual display output buffers) to use as a common base context.
MirOpenGLContext::MirOpenGLContext(const QSharedPointer<MirServer> &server, const QSurfaceFormat &format)
#ifndef QT_NO_DEBUG
: m_logger(new QOpenGLDebugLogger(this))
#endif
{
std::shared_ptr<mir::graphics::Display> display = server->the_display();
// create a temporary GL context to fetch the EGL display and config, so Qt can determine the surface format
std::unique_ptr<mir::graphics::GLContext> mirContext = display->create_gl_context();
mirContext->make_current();
EGLDisplay eglDisplay = eglGetCurrentDisplay();
if (eglDisplay == EGL_NO_DISPLAY) {
qFatal("Unable to determine current EGL Display");
}
EGLContext eglContext = eglGetCurrentContext();
if (eglContext == EGL_NO_CONTEXT) {
qFatal("Unable to determine current EGL Context");
}
EGLint eglConfigId = -1;
EGLBoolean result;
result = eglQueryContext(eglDisplay, eglContext, EGL_CONFIG_ID, &eglConfigId);
if (result != EGL_TRUE || eglConfigId < 0) {
qFatal("Unable to determine current EGL Config ID");
}
EGLConfig eglConfig;
EGLint matchingEglConfigCount;
EGLint const attribList[] = {
EGL_CONFIG_ID, eglConfigId,
EGL_NONE
};
result = eglChooseConfig(eglDisplay, attribList, &eglConfig, 1, &matchingEglConfigCount);
if (result != EGL_TRUE || eglConfig == nullptr || matchingEglConfigCount < 1) {
qFatal("Unable to select EGL Config with the supposed current config ID");
}
QSurfaceFormat formatCopy = format;
formatCopy.setRenderableType(QSurfaceFormat::OpenGLES);
m_format = q_glFormatFromConfig(eglDisplay, eglConfig, formatCopy);
// FIXME: the temporary gl context created by Mir does not have the attributes we specified
// in the GLConfig, so need to set explicitly for now
m_format.setDepthBufferSize(server->the_gl_config()->depth_buffer_bits());
m_format.setStencilBufferSize(server->the_gl_config()->stencil_buffer_bits());
m_format.setSamples(-1);
#ifndef QT_NO_DEBUG
const char* string = (const char*) glGetString(GL_VENDOR);
qDebug() << "OpenGL ES vendor: " << qPrintable(string);
string = (const char*) glGetString(GL_RENDERER);
qDebug() << "OpenGL ES renderer" << qPrintable(string);
string = (const char*) glGetString(GL_VERSION);
qDebug() << "OpenGL ES version" << qPrintable(string);
string = (const char*) glGetString(GL_SHADING_LANGUAGE_VERSION);
qDebug() << "OpenGL ES Shading Language version:" << qPrintable(string);
string = (const char*) glGetString(GL_EXTENSIONS);
qDebug() << "OpenGL ES extensions:" << qPrintable(string);
q_printEglConfig(eglDisplay, eglConfig);
QObject::connect(m_logger, &QOpenGLDebugLogger::messageLogged,
this, &MirOpenGLContext::onGlDebugMessageLogged, Qt::DirectConnection);
#endif // debug
}
QSurfaceFormat MirOpenGLContext::format() const
{
return m_format;
}
void MirOpenGLContext::swapBuffers(QPlatformSurface *surface)
{
// ultimately calls Mir's DisplayBuffer::post_update()
DisplayWindow *displayBuffer = static_cast<DisplayWindow*>(surface);
displayBuffer->swapBuffers(); //blocks for vsync
}
bool MirOpenGLContext::makeCurrent(QPlatformSurface *surface)
{
// ultimately calls Mir's DisplayBuffer::make_current()
DisplayWindow *displayBuffer = static_cast<DisplayWindow*>(surface);
if (displayBuffer) {
displayBuffer->makeCurrent();
#ifndef QT_NO_DEBUG
if (!m_logger->isLogging() && m_logger->initialize()) {
m_logger->startLogging(QOpenGLDebugLogger::SynchronousLogging);
m_logger->enableMessages();
}
#endif
return true;
}
return false;
}
void MirOpenGLContext::doneCurrent()
{
// could call Mir's DisplayBuffer::release_current(), but for what DisplayBuffer?
}
QFunctionPointer MirOpenGLContext::getProcAddress(const QByteArray &procName)
{
return eglGetProcAddress(procName.constData());
}
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