- added an abstract index buffer implementation as well.

src/gl/system/gl_framebuffer.cpp

@@ -44,6 +44,7 @@
 #include "gl/shaders/gl_shaderprogram.h"
 #include "gl_debug.h"
 #include "r_videoscale.h"
+#include "glsys_vertexbuffer.h"
 
 EXTERN_CVAR (Bool, vid_vsync)
 
@@ -361,6 +362,16 @@ IShaderProgram *OpenGLFrameBuffer::CreateShaderProgram()
 	return new FShaderProgram; 
 }
 
+IVertexBuffer *OpenGLFrameBuffer::CreateVertexBuffer()
+{ 
+	return new GLVertexBuffer; 
+}
+
+IIndexBuffer *OpenGLFrameBuffer::CreateIndexBuffer()
+{ 
+	return new GLIndexBuffer; 
+}
+
 
 void OpenGLFrameBuffer::TextureFilterChanged()
 {