diff --git a/libs/rs/Allocation.cpp b/libs/rs/Allocation.cpp
index d69c55f..e37d5de 100644
--- a/libs/rs/Allocation.cpp
+++ b/libs/rs/Allocation.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2012 The Android Open Source Project
+ * Copyright (C) 2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -51,17 +51,14 @@
                    RS_ALLOCATION_USAGE_GRAPHICS_VERTEX |
                    RS_ALLOCATION_USAGE_GRAPHICS_CONSTANTS |
                    RS_ALLOCATION_USAGE_GRAPHICS_RENDER_TARGET |
-                   RS_ALLOCATION_USAGE_GRAPHICS_SURFACE_TEXTURE_INPUT_OPAQUE |
                    RS_ALLOCATION_USAGE_IO_INPUT |
                    RS_ALLOCATION_USAGE_IO_OUTPUT)) != 0) {
         ALOGE("Unknown usage specified.");
     }
 
-    if ((usage & (RS_ALLOCATION_USAGE_GRAPHICS_SURFACE_TEXTURE_INPUT_OPAQUE |
-                  RS_ALLOCATION_USAGE_IO_INPUT)) != 0) {
+    if ((usage & RS_ALLOCATION_USAGE_IO_INPUT) != 0) {
         mWriteAllowed = false;
-        if ((usage & ~(RS_ALLOCATION_USAGE_GRAPHICS_SURFACE_TEXTURE_INPUT_OPAQUE |
-                       RS_ALLOCATION_USAGE_IO_INPUT |
+        if ((usage & ~(RS_ALLOCATION_USAGE_IO_INPUT |
                        RS_ALLOCATION_USAGE_GRAPHICS_TEXTURE |
                        RS_ALLOCATION_USAGE_SCRIPT)) != 0) {
             ALOGE("Invalid usage combination.");
diff --git a/libs/rs/driver/rsdAllocation.cpp b/libs/rs/driver/rsdAllocation.cpp
index fb93d82..f358f93 100644
--- a/libs/rs/driver/rsdAllocation.cpp
+++ b/libs/rs/driver/rsdAllocation.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2011-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@
 #include "hardware/gralloc.h"
 #include "ui/Rect.h"
 #include "ui/GraphicBufferMapper.h"
+#include "gui/SurfaceTexture.h"
 
 #include <GLES/gl.h>
 #include <GLES2/gl2.h>
@@ -139,7 +140,7 @@
 static void UploadToTexture(const Context *rsc, const Allocation *alloc) {
     DrvAllocation *drv = (DrvAllocation *)alloc->mHal.drv;
 
-    if (alloc->mHal.state.usageFlags & RS_ALLOCATION_USAGE_GRAPHICS_SURFACE_TEXTURE_INPUT_OPAQUE) {
+    if (alloc->mHal.state.usageFlags & RS_ALLOCATION_USAGE_IO_INPUT) {
         if (!drv->textureID) {
             RSD_CALL_GL(glGenTextures, 1, &drv->textureID);
         }
@@ -475,7 +476,8 @@
 }
 
 void rsdAllocationIoReceive(const Context *rsc, Allocation *alloc) {
-    ALOGE("not implemented");
+    DrvAllocation *drv = (DrvAllocation *)alloc->mHal.drv;
+    alloc->mHal.state.surfaceTexture->updateTexImage();
 }
 
 
diff --git a/libs/rs/driver/rsdCore.cpp b/libs/rs/driver/rsdCore.cpp
index 35a5c08..6a532e9 100644
--- a/libs/rs/driver/rsdCore.cpp
+++ b/libs/rs/driver/rsdCore.cpp
@@ -227,13 +227,13 @@
 
 
     int cpu = sysconf(_SC_NPROCESSORS_ONLN);
-    ALOGV("%p Launching thread(s), CPUs %i", rsc, cpu);
     if(rsc->props.mDebugMaxThreads && (cpu > (int)rsc->props.mDebugMaxThreads)) {
         cpu = rsc->props.mDebugMaxThreads;
     }
     if (cpu < 2) {
         cpu = 0;
     }
+    ALOGV("%p Launching thread(s), CPUs %i", rsc, cpu);
 
     dc->mWorkers.mCount = (uint32_t)cpu;
     dc->mWorkers.mThreadId = (pthread_t *) calloc(dc->mWorkers.mCount, sizeof(pthread_t));
diff --git a/libs/rs/driver/rsdProgram.cpp b/libs/rs/driver/rsdProgram.cpp
index fa4cb0f..30a4c5f 100644
--- a/libs/rs/driver/rsdProgram.cpp
+++ b/libs/rs/driver/rsdProgram.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2011-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,7 +41,7 @@
                                    textureNames, textureNamesCount, textureNamesLength);
     pv->mHal.drv = drv;
 
-    return drv->createShader();
+    return true;
 }
 
 static void SyncProgramConstants(const Context *rsc, const Program *p) {
@@ -88,7 +88,7 @@
                                    textureNames, textureNamesCount, textureNamesLength);
     pf->mHal.drv = drv;
 
-    return drv->createShader();
+    return true;
 }
 
 void rsdProgramFragmentSetActive(const Context *rsc, const ProgramFragment *pf) {
diff --git a/libs/rs/driver/rsdShader.cpp b/libs/rs/driver/rsdShader.cpp
index 1e73b95..a386735 100644
--- a/libs/rs/driver/rsdShader.cpp
+++ b/libs/rs/driver/rsdShader.cpp
@@ -39,7 +39,10 @@
     initMemberVars();
     initAttribAndUniformArray();
     init(textureNames, textureNamesCount, textureNamesLength);
-    createTexturesString(textureNames, textureNamesCount, textureNamesLength);
+
+    for(size_t i=0; i < textureNamesCount; i++) {
+        mTextureNames.push(String8(textureNames[i], textureNamesLength[i]));
+    }
 }
 
 RsdShader::~RsdShader() {
@@ -138,37 +141,42 @@
     }
 }
 
-void RsdShader::createTexturesString(const char** textureNames, size_t textureNamesCount,
-                                     const size_t *textureNamesLength) {
-    mShaderTextures.setTo("");
+void RsdShader::appendTextures() {
+
+    // TODO: this does not yet handle cases where the texture changes between IO
+    // input and local
+    bool appendUsing = true;
     for (uint32_t ct = 0; ct < mRSProgram->mHal.state.texturesCount; ct ++) {
         if (mRSProgram->mHal.state.textureTargets[ct] == RS_TEXTURE_2D) {
             Allocation *a = mRSProgram->mHal.state.textures[ct];
             if (a && a->mHal.state.surfaceTextureID) {
-                mShaderTextures.append("uniform samplerExternalOES UNI_");
+                if(appendUsing) {
+                    mShader.append("#extension GL_OES_EGL_image_external : require\n");
+                    appendUsing = false;
+                }
+                mShader.append("uniform samplerExternalOES UNI_");
+                mTextureTargets[ct] = GL_TEXTURE_EXTERNAL_OES;
             } else {
-                mShaderTextures.append("uniform sampler2D UNI_");
+                mShader.append("uniform sampler2D UNI_");
+                mTextureTargets[ct] = GL_TEXTURE_2D;
             }
-            mTextureTargets[ct] = GL_TEXTURE_2D;
         } else {
-            mShaderTextures.append("uniform samplerCube UNI_");
+            mShader.append("uniform samplerCube UNI_");
             mTextureTargets[ct] = GL_TEXTURE_CUBE_MAP;
         }
 
-        mShaderTextures.append(textureNames[ct], textureNamesLength[ct]);
-        mShaderTextures.append(";\n");
+        mShader.append(mTextureNames[ct]);
+        mShader.append(";\n");
     }
 }
 
 bool RsdShader::createShader() {
-
     if (mType == GL_FRAGMENT_SHADER) {
         mShader.append("precision mediump float;\n");
     }
     appendUserConstants();
     appendAttributes();
-    mShader.append(mShaderTextures);
-
+    appendTextures();
     mShader.append(mUserShader);
 
     return true;
@@ -178,6 +186,10 @@
     mShaderID = glCreateShader(mType);
     rsAssert(mShaderID);
 
+    if(!mShader.length()) {
+        createShader();
+    }
+
     if (rsc->props.mLogShaders) {
         ALOGV("Loading shader type %x, ID %i", mType, mShaderID);
         ALOGV("%s", mShader.string());
@@ -423,7 +435,9 @@
         }
 
         DrvAllocation *drvTex = (DrvAllocation *)mRSProgram->mHal.state.textures[ct]->mHal.drv;
-        if (drvTex->glTarget != GL_TEXTURE_2D && drvTex->glTarget != GL_TEXTURE_CUBE_MAP) {
+        if (drvTex->glTarget != GL_TEXTURE_2D &&
+            drvTex->glTarget != GL_TEXTURE_CUBE_MAP &&
+            drvTex->glTarget != GL_TEXTURE_EXTERNAL_OES) {
             ALOGE("Attempting to bind unknown texture to shader id %u, texture unit %u",
                   (uint)this, ct);
             rsc->setError(RS_ERROR_BAD_SHADER, "Non-texture allocation bound to a shader");
diff --git a/libs/rs/driver/rsdShader.h b/libs/rs/driver/rsdShader.h
index e32145f..6c0b616 100644
--- a/libs/rs/driver/rsdShader.h
+++ b/libs/rs/driver/rsdShader.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2011-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -81,15 +81,12 @@
 
     void appendAttributes();
     void appendTextures();
-    void createTexturesString(const char** textureNames, size_t textureNamesCount,
-                              const size_t *textureNamesLength);
 
     void initAttribAndUniformArray();
 
     mutable bool mDirty;
     android::String8 mShader;
     android::String8 mUserShader;
-    android::String8 mShaderTextures;
     uint32_t mShaderID;
     uint32_t mType;
 
@@ -101,6 +98,8 @@
     android::String8 *mUniformNames;
     uint32_t *mUniformArraySizes;
 
+    android::Vector<android::String8> mTextureNames;
+
     int32_t mTextureUniformIndexStart;
 
     void logUniform(const android::renderscript::Element *field,
diff --git a/libs/rs/driver/rsdShaderCache.cpp b/libs/rs/driver/rsdShaderCache.cpp
index 89d3c45..50cb9f9 100644
--- a/libs/rs/driver/rsdShaderCache.cpp
+++ b/libs/rs/driver/rsdShaderCache.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2011-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -119,7 +119,6 @@
     if (!vtx->getShaderID() || !frag->getShaderID()) {
         return false;
     }
-    //ALOGV("rsdShaderCache lookup  vtx %i, frag %i", vtx->getShaderID(), frag->getShaderID());
     uint32_t entryCount = mEntries.size();
     for (uint32_t ct = 0; ct < entryCount; ct ++) {
         if ((mEntries[ct]->vtx == vtx->getShaderID()) &&
@@ -134,8 +133,6 @@
         }
     }
 
-    //ALOGV("RsdShaderCache miss");
-    //ALOGE("e0 %x", glGetError());
     ProgramEntry *e = new ProgramEntry(vtx->getAttribCount(),
                                        vtx->getUniformCount(),
                                        frag->getUniformCount());
diff --git a/libs/rs/driver/rsdShaderCache.h b/libs/rs/driver/rsdShaderCache.h
index 0beecae..1192916 100644
--- a/libs/rs/driver/rsdShaderCache.h
+++ b/libs/rs/driver/rsdShaderCache.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 The Android Open Source Project
+ * Copyright (C) 2011-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/libs/rs/rs.spec b/libs/rs/rs.spec
index cf4a391..b373056 100644
--- a/libs/rs/rs.spec
+++ b/libs/rs/rs.spec
@@ -69,6 +69,12 @@
     ret int32_t
 }
 
+AllocationGetSurfaceTextureID2 {
+    param RsAllocation alloc
+    param void *st
+    sync
+}
+
 AllocationSetSurface {
     param RsAllocation alloc
     param RsNativeWindow sur
diff --git a/libs/rs/rsAllocation.cpp b/libs/rs/rsAllocation.cpp
index a404c49..cdff49c 100644
--- a/libs/rs/rsAllocation.cpp
+++ b/libs/rs/rsAllocation.cpp
@@ -20,6 +20,7 @@
 #include "rs_hal.h"
 
 #include "system/window.h"
+#include "gui/SurfaceTexture.h"
 
 using namespace android;
 using namespace android::renderscript;
@@ -64,6 +65,7 @@
 
 Allocation::~Allocation() {
     freeChildrenUnlocked();
+    setSurfaceTexture(mRSC, NULL);
     mRSC->mHal.funcs.allocation.destroy(mRSC, this);
 }
 
@@ -424,6 +426,18 @@
     return id;
 }
 
+void Allocation::setSurfaceTexture(const Context *rsc, SurfaceTexture *st) {
+    if(st != mHal.state.surfaceTexture) {
+        if(mHal.state.surfaceTexture != NULL) {
+            mHal.state.surfaceTexture->decStrong(NULL);
+        }
+        mHal.state.surfaceTexture = st;
+        if(mHal.state.surfaceTexture != NULL) {
+            mHal.state.surfaceTexture->incStrong(NULL);
+        }
+    }
+}
+
 void Allocation::setSurface(const Context *rsc, RsNativeWindow sur) {
     ANativeWindow *nw = (ANativeWindow *)sur;
     ANativeWindow *old = mHal.state.wndSurface;
@@ -696,6 +710,11 @@
     return alloc->getSurfaceTextureID(rsc);
 }
 
+void rsi_AllocationGetSurfaceTextureID2(Context *rsc, RsAllocation valloc, void *vst, size_t len) {
+    Allocation *alloc = static_cast<Allocation *>(valloc);
+    alloc->setSurfaceTexture(rsc, static_cast<SurfaceTexture *>(vst));
+}
+
 void rsi_AllocationSetSurface(Context *rsc, RsAllocation valloc, RsNativeWindow sur) {
     Allocation *alloc = static_cast<Allocation *>(valloc);
     alloc->setSurface(rsc, sur);
diff --git a/libs/rs/rsAllocation.h b/libs/rs/rsAllocation.h
index 58a6fca..e2783d2 100644
--- a/libs/rs/rsAllocation.h
+++ b/libs/rs/rsAllocation.h
@@ -23,6 +23,8 @@
 
 // ---------------------------------------------------------------------------
 namespace android {
+class SurfaceTexture;
+
 namespace renderscript {
 
 class Program;
@@ -60,6 +62,7 @@
             void * usrPtr;
             int32_t surfaceTextureID;
             ANativeWindow *wndSurface;
+            SurfaceTexture *surfaceTexture;
         };
         State state;
 
@@ -130,6 +133,7 @@
     }
 
     int32_t getSurfaceTextureID(const Context *rsc);
+    void setSurfaceTexture(const Context *rsc, SurfaceTexture *st);
     void setSurface(const Context *rsc, RsNativeWindow sur);
     void ioSend(const Context *rsc);
     void ioReceive(const Context *rsc);
diff --git a/libs/rs/rsDefines.h b/libs/rs/rsDefines.h
index 990ef26..0e0cd8d 100644
--- a/libs/rs/rsDefines.h
+++ b/libs/rs/rsDefines.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007 The Android Open Source Project
+ * Copyright (C) 2007-2012 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -100,9 +100,8 @@
     RS_ALLOCATION_USAGE_GRAPHICS_VERTEX = 0x0004,
     RS_ALLOCATION_USAGE_GRAPHICS_CONSTANTS = 0x0008,
     RS_ALLOCATION_USAGE_GRAPHICS_RENDER_TARGET = 0x0010,
-    RS_ALLOCATION_USAGE_GRAPHICS_SURFACE_TEXTURE_INPUT_OPAQUE = 0x0020,
-    RS_ALLOCATION_USAGE_IO_INPUT = 0x0040,
-    RS_ALLOCATION_USAGE_IO_OUTPUT = 0x0080,
+    RS_ALLOCATION_USAGE_IO_INPUT = 0x0020,
+    RS_ALLOCATION_USAGE_IO_OUTPUT = 0x0040,
 
     RS_ALLOCATION_USAGE_ALL = 0x00FF
 };