Adding ability to read back fbo data to renderscript

Change-Id: Ie684c26cbcde22f2483b43415dfc39a3de22c5a1
diff --git a/driver/rsdGL.cpp b/driver/rsdGL.cpp
index a70589b..3ff03b4 100644
--- a/driver/rsdGL.cpp
+++ b/driver/rsdGL.cpp
@@ -39,6 +39,7 @@
 #include "rsContext.h"
 #include "rsdShaderCache.h"
 #include "rsdVertexArray.h"
+#include "rsdFrameBufferObj.h"
 
 using namespace android;
 using namespace android::renderscript;
@@ -294,6 +295,7 @@
     dc->gl.shaderCache = new RsdShaderCache();
     dc->gl.vertexArrayState = new RsdVertexArrayState();
     dc->gl.vertexArrayState->init(dc->gl.gl.maxVertexAttribs);
+    dc->gl.currentFrameBuffer = NULL;
 
     LOGV("initGLThread end %p", rsc);
     return true;