Engine directory for ticket #1

Engine/source/gfx/gl/ggl/ggl.cpp

@@ -0,0 +1,89 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#include "core/strings/stringFunctions.h"
+
+#include "platform/platformDlibrary.h"
+#include "console/console.h"
+
+namespace GL
+{
+
+//-----------------------------------------------------------------------------
+// Current active extensions
+struct GLExtensionPtrs;
+GLExtensionPtrs* _GGLptr;
+
+struct GLExtensionFlags;
+GLExtensionFlags* _GGLflag;
+
+
+//-----------------------------------------------------------------------------
+
+static inline int versionCombine( int major, int minor )
+{
+   return major * 100 + minor;
+}
+
+bool bindFunction( DLibrary *dll, void *&fnAddress, const char *name )
+{
+   fnAddress = dll->bind( name );
+
+   if (!fnAddress)
+      Con::warnf( "GLExtensions: DLL bind failed for %s", name );
+
+   return fnAddress != 0;
+}
+
+bool hasExtension( const char *name, const char *extensions )
+{
+   // Extensions are compared against the extension strings
+   if (extensions && *extensions) {
+      const char* ptr = dStrstr(extensions,name);
+      if (ptr) {
+         char end = ptr[dStrlen(name)];
+         if (end == ' ' || end == 0)
+            return true;
+      }
+   }
+   return false;
+}
+
+bool hasVersion( const char *name, const char* prefix, int major, int minor )
+{
+   // Extension group names are compared against the version number. The prefix
+   // string should be "GL_VERSION" or "GLX_VERSION".. group names are
+   // "GL_VERSION_1_1", "GL_VERSION_1_2", "GLX_VERSION_1_2", etc.
+   while (*name && *prefix && *name == *prefix)
+      name++, prefix++;
+   if (*name == '_' && *prefix == '\0') {
+      int maj = dAtoi(++name);
+      while (dIsdigit(*name))
+         *name++;
+      int min = dAtoi(++name);
+      return versionCombine(maj,min) <= versionCombine(major,minor);
+   }
+   return false;
+}
+
+} // Namespace
+