1 files changed, 114 insertions, 0 deletions
diff --git a/plugins/gtkui/gtkglext-gtk2/gdk/gdkglquery.c b/plugins/gtkui/gtkglext-gtk2/gdk/gdkglquery.c
new file mode 100644
index 00000000..f581cf6b
--- /dev/null
+++ b/plugins/gtkui/gtkglext-gtk2/gdk/gdkglquery.c
@@ -0,0 +1,114 @@
+/* GdkGLExt - OpenGL Extension to GDK
+ * Copyright (C) 2002-2004  Naofumi Yasufuku
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "gdkglprivate.h"
+#include "gdkglquery.h"
+
+#ifdef G_OS_WIN32
+#define WIN32_LEAN_AND_MEAN 1
+#include <windows.h>
+#endif
+
+#include <GL/gl.h>
+
+/*
+ * This code is based on glutExtensionSupported().
+ */
+
+/**
+ * gdk_gl_query_gl_extension:
+ * @extension: name of OpenGL extension.
+ *
+ * Determines whether a given OpenGL extension is supported.
+ *
+ * There must be a valid current rendering context to call
+ * gdk_gl_query_gl_extension().
+ *
+ * gdk_gl_query_gl_extension() returns information about OpenGL extensions
+ * only. This means that window system dependent extensions (for example,
+ * GLX extensions) are not reported by gdk_gl_query_gl_extension().
+ *
+ * Return value: TRUE if the OpenGL extension is supported, FALSE if not 
+ *               supported.
+ **/
+gboolean
+gdk_gl_query_gl_extension (const char *extension)
+{
+  static const GLubyte *extensions = NULL;
+  const GLubyte *start;
+  GLubyte *where, *terminator;
+
+  /* Extension names should not have spaces. */
+  where = (GLubyte *) strchr (extension, ' ');
+  if (where || *extension == '\0')
+    return FALSE;
+
+  if (extensions == NULL)
+    extensions = glGetString (GL_EXTENSIONS);
+
+  /* It takes a bit of care to be fool-proof about parsing the
+     OpenGL extensions string.  Don't be fooled by sub-strings,
+     etc. */
+  start = extensions;
+  for (;;)
+    {
+      /* If your application crashes in the strstr routine below,
+         you are probably calling gdk_gl_query_gl_extension without
+         having a current window.  Calling glGetString without
+         a current OpenGL context has unpredictable results.
+         Please fix your program. */
+      where = (GLubyte *) strstr ((const char *) start, extension);
+      if (where == NULL)
+        break;
+
+      terminator = where + strlen (extension);
+
+      if (where == start || *(where - 1) == ' ')
+        if (*terminator == ' ' || *terminator == '\0')
+          {
+            GDK_GL_NOTE (MISC, g_message (" - %s - supported", extension));
+            return TRUE;
+          }
+
+      start = terminator;
+    }
+
+  GDK_GL_NOTE (MISC, g_message (" - %s - not supported", extension));
+
+  return FALSE;
+}
+
+/*< private >*/
+void
+_gdk_gl_print_gl_info (void)
+{
+  static gboolean done = FALSE;
+
+  if (!done)
+    {
+      g_message (" -- GL_VENDOR     : %s", glGetString (GL_VENDOR));
+      g_message (" -- GL_RENDERER   : %s", glGetString (GL_RENDERER));
+      g_message (" -- GL_VERSION    : %s", glGetString (GL_VERSION));
+      g_message (" -- GL_EXTENSIONS : %s", glGetString (GL_EXTENSIONS));
+
+      done = TRUE;
+    }
+}