glxhelper.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2014-2019 The ManaPlus Developers
 * Copyright (C) 2019-2021 Andrei Karas
 *
 * This file is part of The ManaPlus Client.
 *
 * This program 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
 * any later version.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "utils/glxhelper.h"
 
#if defined(USE_OPENGL) && defined(USE_X11)
 
#include "logger.h"
 
#include "render/opengl/mglcheck.h"
 
#include "render/openglx/mglx.h"
 
#include "render/opengl/mgldefines.h"
RENDER_OPENGL_MGLDEFINES_H
 
#include "debug.h"
 
static int ErrorHandler(Display *d A_UNUSED, XErrorEvent *e A_UNUSED)
{
 return 0;
}
 
void *GlxHelper::createContext(const unsigned long window,
 void *const display0,
 const int major,
 const int minor,
 const int profile)
{
 Display *const display = static_cast<Display*>(display0);
 XSync(display, false);
 int (*handler)(Display *, XErrorEvent *) = XSetErrorHandler(ErrorHandler);
 void *context = mglXGetCurrentContext();
 if (!display)
 return context;
 if (isGLNull(mglXGetCurrentContext)
 || isGLNull(mglXCreateContextAttribs)
 || isGLNull(mglXChooseFBConfig))
 {
 logger->log("Can't change context, functions in driver "
 "not implemented");
 XSetErrorHandler(handler);
 return context;
 }
 if (!context)
 {
 logger->log("Can't change context, because current "
 "context not created");
 XSetErrorHandler(handler);
 return context;
 }
 int glxAttribs[] =
 {
 GLX_RENDER_TYPE, GLX_RGBA_BIT,
 GLX_RED_SIZE, 3,
 GLX_GREEN_SIZE, 3,
 GLX_BLUE_SIZE, 2,
 GLX_DOUBLEBUFFER, 1,
 0
 };
 
 int fbcount = 0;
 GLXFBConfig *framebuffer_config = mglXChooseFBConfig(display,
 DefaultScreen(display),
 glxAttribs,
 &fbcount);
 
 if (!framebuffer_config || !fbcount)
 {
 logger->log("No correct fb profile found");
 XSetErrorHandler(handler);
 return nullptr;
 }
 logger->log("Found %d frame buffer contexts.", fbcount);
 
 int attribs[] =
 {
 GLX_CONTEXT_MAJOR_VERSION_ARB, major,
 GLX_CONTEXT_MINOR_VERSION_ARB, minor,
 GLX_CONTEXT_PROFILE_MASK_ARB, profile,
 0, 0
 };
 
 void *const context2 = mglXCreateContextAttribs(display,
 framebuffer_config[0], context, true, attribs);
 if (!context2)
 {
 logger->log("context %d.%d creation failed", major, minor);
 XSetErrorHandler(handler);
 return nullptr;
 }
 
 XSync(display, false);
 XSetErrorHandler(handler);
 
 if (!mglXMakeCurrent(display, window, context2))
 {
 mglXDestroyContext(display, context2);
 logger->log("make current context %d.%d failed", major, minor);
 return nullptr;
 }
 
 if (mglXGetCurrentContext() != context2)
 {
 mglXDestroyContext(display, context2);
 logger->log("context cant be changed to %d.%d.", major, minor);
 return nullptr;
 }
 
// do not delete SDL context, because on exit it will crash
// mglXDestroyContext(display, context);
 logger->log("Context for %d.%d created", major, minor);
 return context2;
}
 
bool GlxHelper::makeCurrent(const unsigned long window,
 void *const display,
 void *const context)
{
 if (!display)
 return false;
 return mglXMakeCurrent(static_cast<Display*>(display), window, context);
}
 
#endif // defined(USE_OPENGL) && defined(USE_X11)