1 files changed, 120 insertions, 0 deletions
diff --git a/src/utils/glxhelper.cpp b/src/utils/glxhelper.cpp
new file mode 100644
index 000000000..1fedeb9c6
--- /dev/null
+++ b/src/utils/glxhelper.cpp
@@ -0,0 +1,120 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2014  The ManaPlus Developers
+ *
+ *  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/mglx.h"
+#include "render/mglxtypes.h"
+
+#include "utils/stringutils.h"
+
+#include "debug.h"
+
+static int ErrorHandler(Display *d A_UNUSED, XErrorEvent *e A_UNUSED)
+{
+    return 0;
+}
+
+void *GlxHelper::createContext(unsigned int window,
+                               void *const display0,
+                               const int major,
+                               const int minor)
+{
+    Display *const display = static_cast<Display*>(display0);
+    XSync(display, false);
+    int (*handler) (Display *, XErrorEvent *) = XSetErrorHandler(ErrorHandler);
+    void *context = mglXGetCurrentContext();
+    if (!mglXGetCurrentContext
+        || !mglXCreateContextAttribs
+        || !mglXChooseFBConfig)
+    {
+        logger->log("Cant change context, functions in driver "
+            "not implimented");
+        XSetErrorHandler(handler);
+        return context;
+    }
+    if (!context)
+    {
+        logger->log("Cant 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;
+    }
+
+    int attribs[] =
+    {
+        GLX_CONTEXT_MAJOR_VERSION_ARB, major,
+        GLX_CONTEXT_MINOR_VERSION_ARB, minor,
+        GLX_CONTEXT_PROFILE_MASK_ARB, 0x01,   // core 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;
+    }
+
+//  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;
+}
+
+#endif  // defined(USE_OPENGL) && defined(USE_X11)