cogl-shader: unifies the driver/{gl,gles} shader files

The per driver implementations of cogl-shader.c had become almost
identical we now have a single cogl/cogl-shader.c instead.

cogl/cogl-shader-private.h

@@ -0,0 +1,40 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2008,2009 Intel Corporation.
+ *
+ * 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 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, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+#ifndef __COGL_SHADER_H
+#define __COGL_SHADER_H
+
+#include "cogl-handle.h"
+
+typedef struct _CoglShader CoglShader;
+
+struct _CoglShader
+{
+  CoglHandleObject   _parent;
+  GLuint             gl_handle;
+  CoglShaderType     type;
+};
+
+CoglShader *_cogl_shader_pointer_from_handle (CoglHandle handle);
+
+#endif /* __COGL_SHADER_H */