Fix Fall RS to use the new ProgramVertex APIs.

import android.renderscript.ScriptC;

import android.renderscript.ProgramFragment;

import android.renderscript.ProgramStore;

import android.renderscript.ProgramVertexAlloc;

import android.renderscript.Allocation;

import android.renderscript.Sampler;

import android.renderscript.ProgramVertex;

import static android.renderscript.Sampler.Value.LINEAR;

import static android.renderscript.Sampler.Value.CLAMP;

import static android.renderscript.ProgramStore.DepthFunc.*;

    private Sampler mSampler;

    private ProgramFragment mPfBackground;

    private ProgramStore mPfsBackground;

    private RenderScript.ProgramVertex mPvBackground;

    private ProgramVertexAlloc mPvOrthoAlloc;

    private ProgramVertex mPvBackground;

    private ProgramVertex.MatrixAllocation mPvOrthoAlloc;

    private Allocation mTexturesIDs;

    private Allocation[] mTextures;

    }

    private void createProgramVertex() {

        mPvOrthoAlloc = new ProgramVertexAlloc(mRS);

        mPvOrthoAlloc = new ProgramVertex.MatrixAllocation(mRS);

        mPvOrthoAlloc.setupOrthoWindow(mWidth, mHeight);

        mRS.programVertexBegin(null, null);

        mRS.programVertexSetTextureMatrixEnable(true);

        mPvBackground = mRS.programVertexCreate();

        mPvBackground.bindAllocation(0, mPvOrthoAlloc.mAlloc);

        ProgramVertex.Builder pvb = new ProgramVertex.Builder(mRS, null, null);

        pvb.setTextureMatrixEnable(true);

        mPvBackground = pvb.create();

        mPvBackground.bindAllocation(0, mPvOrthoAlloc);

        mPvBackground.setName("PVBackground");

    }

}