diff --git a/include/ui/FramebufferNativeWindow.h b/include/ui/FramebufferNativeWindow.h
index cb9bf94..68144b5 100644
--- a/include/ui/FramebufferNativeWindow.h
+++ b/include/ui/FramebufferNativeWindow.h
@@ -63,6 +63,7 @@
     static int lockBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
     static int queueBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
     static int query(android_native_window_t* window, int what, int* value);
+    static int perform(android_native_window_t* window, int operation, ...);
     
     framebuffer_device_t* fbDev;
     alloc_device_t* grDev;
diff --git a/include/ui/ISurface.h b/include/ui/ISurface.h
index adba45a..7909c2f 100644
--- a/include/ui/ISurface.h
+++ b/include/ui/ISurface.h
@@ -50,7 +50,7 @@
 public: 
     DECLARE_META_INTERFACE(Surface);
 
-    virtual sp<SurfaceBuffer> getBuffer() = 0; 
+    virtual sp<SurfaceBuffer> getBuffer(int usage) = 0; 
     
     class BufferHeap {
     public:
diff --git a/include/ui/Surface.h b/include/ui/Surface.h
index d5dad31..4ff0e4a 100644
--- a/include/ui/Surface.h
+++ b/include/ui/Surface.h
@@ -184,7 +184,7 @@
     friend class IOMX;
     const sp<ISurface>& getISurface() const { return mSurface; }
 
-    status_t getBufferLocked(int index);
+    status_t getBufferLocked(int index, int usage);
    
            status_t validate(per_client_cblk_t const* cblk) const;
     static void _send_dirty_region(layer_cblk_t* lcblk, const Region& dirty);
@@ -197,11 +197,13 @@
     static int lockBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
     static int queueBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
     static int query(android_native_window_t* window, int what, int* value);
+    static int perform(android_native_window_t* window, int operation, ...);
 
     int dequeueBuffer(android_native_buffer_t** buffer);
     int lockBuffer(android_native_buffer_t* buffer);
     int queueBuffer(android_native_buffer_t* buffer);
     int query(int what, int* value);
+    int perform(int operation, va_list args);
 
     status_t dequeueBuffer(sp<SurfaceBuffer>* buffer);
     status_t lockBuffer(const sp<SurfaceBuffer>& buffer);
@@ -217,6 +219,7 @@
     uint32_t                    mIdentity;
     uint32_t                    mWidth;
     uint32_t                    mHeight;
+    uint32_t                    mUsage;
     PixelFormat                 mFormat;
     uint32_t                    mFlags;
     mutable Region              mDirtyRegion;
diff --git a/include/ui/egl/android_natives.h b/include/ui/egl/android_natives.h
index 7da69b1..4c58e47 100644
--- a/include/ui/egl/android_natives.h
+++ b/include/ui/egl/android_natives.h
@@ -67,6 +67,11 @@
     NATIVE_WINDOW_FORMAT    = 2,
 };
 
+/* valid operations for the (*perform)() hook */
+enum {
+    NATIVE_WINDOW_SET_USAGE = 0
+};
+
 struct android_native_window_t 
 {
 #ifdef __cplusplus
@@ -142,11 +147,45 @@
      * Returns 0 on success or -errno on error.
      */
     int     (*query)(struct android_native_window_t* window,
-            int what, int* value);
+                int what, int* value);
     
-    void* reserved_proc[4];
+    /*
+     * hook used to perform various operations on the surface.
+     * (*perform)() is a generic mechanism to add functionality to
+     * android_native_window_t while keeping backward binary compatibility.
+     * 
+     * This hook should not be called directly, instead use the helper functions
+     * defined below.
+     * 
+     * The valid operations are:
+     *     NATIVE_WINDOW_SET_USAGE
+     *  
+     */
+    
+    int     (*perform)(struct android_native_window_t* window,
+                int operation, ... );
+    
+    void* reserved_proc[3];
 };
 
+
+/*
+ *  native_window_set_usage() sets the intended usage flags for the next
+ *  buffers acquired with (*lockBuffer)() and on.
+ *  By default (if this function is never called), a usage of
+ *      GRALLOC_USAGE_HW_RENDER | GRALLOC_USAGE_HW_TEXTURE
+ *  is assumed.
+ *  Calling this function will usually cause following buffers to be
+ *  reallocated.
+ */
+
+inline int native_window_set_usage(
+        struct android_native_window_t* window, int usage)
+{
+    return window->perform(window, NATIVE_WINDOW_SET_USAGE, usage);
+}
+
+
 // ---------------------------------------------------------------------------
 
 /* FIXME: this is legacy for pixmaps */
diff --git a/libs/audioflinger/AudioFlinger.cpp b/libs/audioflinger/AudioFlinger.cpp
index 2e947d6..77a126c 100644
--- a/libs/audioflinger/AudioFlinger.cpp
+++ b/libs/audioflinger/AudioFlinger.cpp
@@ -1860,9 +1860,7 @@
                          mSuspended) {
                 if (!mStandby) {
                     for (size_t i = 0; i < outputTracks.size(); i++) {
-                        mLock.unlock();
                         outputTracks[i]->stop();
-                        mLock.lock();
                     }
                     mStandby = true;
                     mBytesWritten = 0;
@@ -1903,9 +1901,9 @@
             if (!mSuspended) {
                 for (size_t i = 0; i < outputTracks.size(); i++) {
                     outputTracks[i]->write(curBuf, mFrameCount);
+                    mustSleep = false;
                 }
                 mStandby = false;
-                mustSleep = false;
                 mBytesWritten += mixBufferSize;
             }
         } else {
@@ -1935,11 +1933,14 @@
         outputTracks.clear();
     }
 
-    if (!mStandby) {
-        for (size_t i = 0; i < outputTracks.size(); i++) {
-            mLock.unlock();
-            outputTracks[i]->stop();
-            mLock.lock();
+    { // scope for the mLock
+
+        Mutex::Autolock _l(mLock);
+        if (!mStandby) {
+            LOGV("DuplicatingThread() exiting out of standby");
+            for (size_t i = 0; i < mOutputTracks.size(); i++) {
+                mOutputTracks[i]->destroy();
+            }
         }
     }
 
@@ -1957,9 +1958,11 @@
                                             mFormat,
                                             mChannelCount,
                                             frameCount);
-    thread->setStreamVolume(AudioSystem::NUM_STREAM_TYPES, 1.0f);
-    mOutputTracks.add(outputTrack);
-    LOGV("addOutputTrack() track %p, on thread %p", outputTrack, thread);
+    if (outputTrack->cblk() != NULL) {
+        thread->setStreamVolume(AudioSystem::NUM_STREAM_TYPES, 1.0f);
+        mOutputTracks.add(outputTrack);
+        LOGV("addOutputTrack() track %p, on thread %p", outputTrack, thread);
+    }
 }
 
 void AudioFlinger::DuplicatingThread::removeOutputTrack(MixerThread *thread)
@@ -1967,6 +1970,7 @@
     Mutex::Autolock _l(mLock);
     for (size_t i = 0; i < mOutputTracks.size(); i++) {
         if (mOutputTracks[i]->thread() == (ThreadBase *)thread) {
+            mOutputTracks[i]->destroy();
             mOutputTracks.removeAt(i);
             return;
         }
@@ -2456,20 +2460,23 @@
 {
 
     PlaybackThread *playbackThread = (PlaybackThread *)thread.unsafe_get();
-    mCblk->out = 1;
-    mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t);
-    mCblk->volume[0] = mCblk->volume[1] = 0x1000;
-    mOutBuffer.frameCount = 0;
-    mWaitTimeMs = (playbackThread->frameCount() * 2 * 1000) / playbackThread->sampleRate();
-
-    LOGV("OutputTrack constructor mCblk %p, mBuffer %p, mCblk->buffers %p, mCblk->frameCount %d, mCblk->sampleRate %d, mCblk->channels %d mBufferEnd %p mWaitTimeMs %d",
-            mCblk, mBuffer, mCblk->buffers, mCblk->frameCount, mCblk->sampleRate, mCblk->channels, mBufferEnd, mWaitTimeMs);
-
+    if (mCblk != NULL) {
+        mCblk->out = 1;
+        mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t);
+        mCblk->volume[0] = mCblk->volume[1] = 0x1000;
+        mOutBuffer.frameCount = 0;
+        mWaitTimeMs = (playbackThread->frameCount() * 2 * 1000) / playbackThread->sampleRate();
+        playbackThread->mTracks.add(this);
+        LOGV("OutputTrack constructor mCblk %p, mBuffer %p, mCblk->buffers %p, mCblk->frameCount %d, mCblk->sampleRate %d, mCblk->channels %d mBufferEnd %p mWaitTimeMs %d",
+                mCblk, mBuffer, mCblk->buffers, mCblk->frameCount, mCblk->sampleRate, mCblk->channels, mBufferEnd, mWaitTimeMs);
+    } else {
+        LOGW("Error creating output track on thread %p", playbackThread);
+    }
 }
 
 AudioFlinger::PlaybackThread::OutputTrack::~OutputTrack()
 {
-    stop();
+    clearBufferQueue();
 }
 
 status_t AudioFlinger::PlaybackThread::OutputTrack::start()
@@ -2908,7 +2915,7 @@
                     if (mReqChannelCount != mActiveTrack->channelCount()) {
                         mActiveTrack.clear();
                     } else {
-                        mActiveTrack->mState == TrackBase::ACTIVE;
+                        mActiveTrack->mState = TrackBase::ACTIVE;
                     }
                     mStartStopCond.broadcast();
                 }
diff --git a/libs/audioflinger/AudioFlinger.h b/libs/audioflinger/AudioFlinger.h
index 4ba5977..65c148e 100644
--- a/libs/audioflinger/AudioFlinger.h
+++ b/libs/audioflinger/AudioFlinger.h
@@ -245,6 +245,7 @@
             virtual status_t    start() = 0;
             virtual void        stop() = 0;
                     sp<IMemory> getCblk() const;
+                    audio_track_cblk_t* cblk() const { return mCblk; }
 
         protected:
             friend class ThreadBase;
@@ -260,10 +261,6 @@
             virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer) = 0;
             virtual void releaseBuffer(AudioBufferProvider::Buffer* buffer);
 
-            audio_track_cblk_t* cblk() const {
-                return mCblk;
-            }
-
             int format() const {
                 return mFormat;
             }
@@ -528,6 +525,7 @@
     private:
 
         friend class AudioFlinger;
+        friend class OutputTrack;
         friend class Track;
         friend class TrackBase;
         friend class MixerThread;
diff --git a/libs/surfaceflinger/Layer.cpp b/libs/surfaceflinger/Layer.cpp
index d1142cc..8c0b40d 100644
--- a/libs/surfaceflinger/Layer.cpp
+++ b/libs/surfaceflinger/Layer.cpp
@@ -217,7 +217,7 @@
     drawWithOpenGL(clip, mTextures[index]);
 }
 
-sp<SurfaceBuffer> Layer::peekBuffer()
+sp<SurfaceBuffer> Layer::peekBuffer(int usage)
 {
     /*
      * This is called from the client's Surface::lock(), after it locked
@@ -250,7 +250,7 @@
     }
     
     LayerBitmap& layerBitmap(mBuffers[backBufferIndex]);
-    sp<SurfaceBuffer> buffer = layerBitmap.allocate();
+    sp<SurfaceBuffer> buffer = layerBitmap.allocate(usage);
     
     LOGD_IF(DEBUG_RESIZE,
             "Layer::getBuffer(this=%p), index=%d, (%d,%d), (%d,%d)",
@@ -649,12 +649,12 @@
 {
 }
 
-sp<SurfaceBuffer> Layer::SurfaceLayer::getBuffer()
+sp<SurfaceBuffer> Layer::SurfaceLayer::getBuffer(int usage)
 {
     sp<SurfaceBuffer> buffer = 0;
     sp<Layer> owner(getOwner());
     if (owner != 0) {
-        buffer = owner->peekBuffer();
+        buffer = owner->peekBuffer(usage);
     }
     return buffer;
 }
diff --git a/libs/surfaceflinger/Layer.h b/libs/surfaceflinger/Layer.h
index 4c13d6e..add5d50 100644
--- a/libs/surfaceflinger/Layer.h
+++ b/libs/surfaceflinger/Layer.h
@@ -101,7 +101,7 @@
 
     status_t resize(int32_t index, uint32_t w, uint32_t h, const char* what);
     Region post(uint32_t* oldState, bool& recomputeVisibleRegions);
-    sp<SurfaceBuffer> peekBuffer();
+    sp<SurfaceBuffer> peekBuffer(int usage);
     void destroy();
     void scheduleBroadcast();
 
@@ -114,7 +114,7 @@
                 ~SurfaceLayer();
 
     private:
-        virtual sp<SurfaceBuffer> getBuffer();
+        virtual sp<SurfaceBuffer> getBuffer(int usage);
 
         sp<Layer> getOwner() const {
             return static_cast<Layer*>(Surface::getOwner().get());
diff --git a/libs/surfaceflinger/LayerBase.cpp b/libs/surfaceflinger/LayerBase.cpp
index fbce73dd..419574c 100644
--- a/libs/surfaceflinger/LayerBase.cpp
+++ b/libs/surfaceflinger/LayerBase.cpp
@@ -759,7 +759,7 @@
     return BnSurface::onTransact(code, data, reply, flags);
 }
 
-sp<SurfaceBuffer> LayerBaseClient::Surface::getBuffer() 
+sp<SurfaceBuffer> LayerBaseClient::Surface::getBuffer(int) 
 {
     return NULL; 
 }
diff --git a/libs/surfaceflinger/LayerBase.h b/libs/surfaceflinger/LayerBase.h
index 6fb1d1c..65bf55b 100644
--- a/libs/surfaceflinger/LayerBase.h
+++ b/libs/surfaceflinger/LayerBase.h
@@ -335,7 +335,7 @@
         sp<LayerBaseClient> getOwner() const;
 
     private:
-        virtual sp<SurfaceBuffer> getBuffer();
+        virtual sp<SurfaceBuffer> getBuffer(int usage);
         virtual status_t registerBuffers(const ISurface::BufferHeap& buffers); 
         virtual void postBuffer(ssize_t offset);
         virtual void unregisterBuffers();
diff --git a/libs/surfaceflinger/LayerBitmap.cpp b/libs/surfaceflinger/LayerBitmap.cpp
index 5221fed..5e74451 100644
--- a/libs/surfaceflinger/LayerBitmap.cpp
+++ b/libs/surfaceflinger/LayerBitmap.cpp
@@ -38,13 +38,14 @@
 // Buffer and implementation of android_native_buffer_t
 // ===========================================================================
 
-Buffer::Buffer(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags)
+Buffer::Buffer(uint32_t w, uint32_t h, PixelFormat format,
+        uint32_t reqUsage, uint32_t flags)
     : SurfaceBuffer(), mInitCheck(NO_INIT), mFlags(flags), 
     mVStride(0)
 {
     this->format = format;
     if (w>0 && h>0) {
-        mInitCheck = initSize(w, h);
+        mInitCheck = initSize(w, h, reqUsage);
     }
 }
 
@@ -65,7 +66,7 @@
     return static_cast<android_native_buffer_t*>(const_cast<Buffer*>(this));
 }
 
-status_t Buffer::initSize(uint32_t w, uint32_t h)
+status_t Buffer::initSize(uint32_t w, uint32_t h, uint32_t reqUsage)
 {
     status_t err = NO_ERROR;
 
@@ -88,16 +89,9 @@
         usage = BufferAllocator::USAGE_SW_READ_OFTEN | 
                 BufferAllocator::USAGE_SW_WRITE_OFTEN;
     } else {
-        if (mFlags & Buffer::GPU) {
-            // the client wants to do GL rendering
-            usage = BufferAllocator::USAGE_HW_RENDER |
-                    BufferAllocator::USAGE_HW_TEXTURE;
-        } else {
-            // software rendering-client, h/w composition
-            usage = BufferAllocator::USAGE_SW_READ_OFTEN | 
-                    BufferAllocator::USAGE_SW_WRITE_OFTEN |
-                    BufferAllocator::USAGE_HW_TEXTURE;
-        }
+        // it's allowed to modify the usage flags here, but generally
+        // the requested flags should be honored.
+        usage = reqUsage | BufferAllocator::USAGE_HW_TEXTURE;
     }
 
     err = allocator.alloc(w, h, format, usage, &handle, &stride);
@@ -174,12 +168,12 @@
     return NO_ERROR;
 }
 
-sp<Buffer> LayerBitmap::allocate()
+sp<Buffer> LayerBitmap::allocate(uint32_t reqUsage)
 {
     Mutex::Autolock _l(mLock);
     surface_info_t* info = mInfo;
     mBuffer.clear(); // free buffer before allocating a new one
-    sp<Buffer> buffer = new Buffer(mWidth, mHeight, mFormat, mFlags);
+    sp<Buffer> buffer = new Buffer(mWidth, mHeight, mFormat, reqUsage, mFlags);
     status_t err = buffer->initCheck();
     if (LIKELY(err == NO_ERROR)) {
         info->flags  = surface_info_t::eBufferDirty;
diff --git a/libs/surfaceflinger/LayerBitmap.h b/libs/surfaceflinger/LayerBitmap.h
index 22525ce..48ee553 100644
--- a/libs/surfaceflinger/LayerBitmap.h
+++ b/libs/surfaceflinger/LayerBitmap.h
@@ -58,7 +58,8 @@
     };
 
     // creates w * h buffer
-    Buffer(uint32_t w, uint32_t h, PixelFormat format, uint32_t flags = 0);
+    Buffer(uint32_t w, uint32_t h, PixelFormat format,
+            uint32_t reqUsage, uint32_t flags = 0);
 
     // return status
     status_t initCheck() const;
@@ -81,7 +82,7 @@
     Buffer& operator = (const Buffer& rhs);
     const Buffer& operator = (const Buffer& rhs) const;
 
-    status_t initSize(uint32_t w, uint32_t h);
+    status_t initSize(uint32_t w, uint32_t h, uint32_t reqUsage);
 
     ssize_t                 mInitCheck;
     uint32_t                mFlags;
@@ -108,7 +109,7 @@
 
     status_t setSize(uint32_t w, uint32_t h);
 
-    sp<Buffer> allocate();
+    sp<Buffer> allocate(uint32_t reqUsage);
     status_t free();
     
     sp<const Buffer>  getBuffer() const { return mBuffer; }
diff --git a/libs/surfaceflinger/LayerBuffer.cpp b/libs/surfaceflinger/LayerBuffer.cpp
index 90e7f50..bd6d472 100644
--- a/libs/surfaceflinger/LayerBuffer.cpp
+++ b/libs/surfaceflinger/LayerBuffer.cpp
@@ -28,6 +28,7 @@
 
 #include <hardware/copybit.h>
 
+#include "BufferAllocator.h"
 #include "LayerBuffer.h"
 #include "SurfaceFlinger.h"
 #include "DisplayHardware/DisplayHardware.h"
@@ -464,7 +465,9 @@
                         mTempBitmap->getWidth() < tmp_w || 
                         mTempBitmap->getHeight() < tmp_h) {
                     mTempBitmap.clear();
-                    mTempBitmap = new android::Buffer(tmp_w, tmp_h, src.img.format);
+                    mTempBitmap = new android::Buffer(
+                            tmp_w, tmp_h, src.img.format,
+                            BufferAllocator::USAGE_HW_2D);
                     err = mTempBitmap->initCheck();
                 }
 
diff --git a/libs/surfaceflinger/LayerDim.cpp b/libs/surfaceflinger/LayerDim.cpp
index 8e9df9c..f613767 100644
--- a/libs/surfaceflinger/LayerDim.cpp
+++ b/libs/surfaceflinger/LayerDim.cpp
@@ -21,6 +21,7 @@
 #include <utils/Errors.h>
 #include <utils/Log.h>
 
+#include "BufferAllocator.h"
 #include "LayerDim.h"
 #include "SurfaceFlinger.h"
 #include "DisplayHardware/DisplayHardware.h"
@@ -68,7 +69,10 @@
 
     if (LIKELY(flags & DisplayHardware::DIRECT_TEXTURE)) {
         // TODO: api to pass the usage flags
-        sp<Buffer> buffer = new Buffer(w, h, PIXEL_FORMAT_RGB_565);
+        sp<Buffer> buffer = new Buffer(w, h, PIXEL_FORMAT_RGB_565,
+                 BufferAllocator::USAGE_SW_WRITE_OFTEN |
+                 BufferAllocator::USAGE_HW_TEXTURE);
+        
         android_native_buffer_t* clientBuf = buffer->getNativeBuffer();
 
         glGenTextures(1, &sTexId);
@@ -92,7 +96,7 @@
 
         // initialize the texture with zeros
         GGLSurface t;
-        buffer->lock(&t, GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN);
+        buffer->lock(&t, GRALLOC_USAGE_SW_WRITE_OFTEN);
         memset(t.data, 0, t.stride * t.height * 2);
         buffer->unlock();
         sUseTexture = true;
diff --git a/libs/ui/FramebufferNativeWindow.cpp b/libs/ui/FramebufferNativeWindow.cpp
index f6c666d..90b5163 100644
--- a/libs/ui/FramebufferNativeWindow.cpp
+++ b/libs/ui/FramebufferNativeWindow.cpp
@@ -132,6 +132,7 @@
     android_native_window_t::lockBuffer = lockBuffer;
     android_native_window_t::queueBuffer = queueBuffer;
     android_native_window_t::query = query;
+    android_native_window_t::perform = perform;
 }
 
 FramebufferNativeWindow::~FramebufferNativeWindow() 
@@ -235,6 +236,18 @@
     return BAD_VALUE;
 }
 
+int FramebufferNativeWindow::perform(android_native_window_t* window,
+        int operation, ...)
+{
+    switch (operation) {
+        case NATIVE_WINDOW_SET_USAGE:
+            break;
+        default:
+            return NAME_NOT_FOUND;
+    }
+    return NO_ERROR;
+}
+
 // ----------------------------------------------------------------------------
 }; // namespace android
 // ----------------------------------------------------------------------------
diff --git a/libs/ui/ISurface.cpp b/libs/ui/ISurface.cpp
index 9fbae1e..b78e8b5 100644
--- a/libs/ui/ISurface.cpp
+++ b/libs/ui/ISurface.cpp
@@ -71,10 +71,11 @@
     {
     }
 
-    virtual sp<SurfaceBuffer> getBuffer()
+    virtual sp<SurfaceBuffer> getBuffer(int usage)
     {
         Parcel data, reply;
         data.writeInterfaceToken(ISurface::getInterfaceDescriptor());
+        data.writeInt32(usage);
         remote()->transact(GET_BUFFER, data, &reply);
         sp<SurfaceBuffer> buffer = new SurfaceBuffer(reply);
         return buffer;
@@ -135,7 +136,8 @@
     switch(code) {
         case GET_BUFFER: {
             CHECK_INTERFACE(ISurface, data, reply);
-            sp<SurfaceBuffer> buffer(getBuffer());
+            int usage = data.readInt32();
+            sp<SurfaceBuffer> buffer(getBuffer(usage));
             return SurfaceBuffer::writeToParcel(reply, buffer.get());
         }
         case REGISTER_BUFFERS: {
diff --git a/libs/ui/Surface.cpp b/libs/ui/Surface.cpp
index 4abb7f6..2b6905f 100644
--- a/libs/ui/Surface.cpp
+++ b/libs/ui/Surface.cpp
@@ -414,6 +414,7 @@
     android_native_window_t::lockBuffer       = lockBuffer;
     android_native_window_t::queueBuffer      = queueBuffer;
     android_native_window_t::query            = query;
+    android_native_window_t::perform          = perform;
     mSwapRectangle.makeInvalid();
     DisplayInfo dinfo;
     SurfaceComposerClient::getDisplayInfo(0, &dinfo);
@@ -423,6 +424,8 @@
     const_cast<int&>(android_native_window_t::minSwapInterval) = 1;
     const_cast<int&>(android_native_window_t::maxSwapInterval) = 1;
     const_cast<uint32_t&>(android_native_window_t::flags) = 0;
+    // be default we request a hardware surface
+    mUsage = GRALLOC_USAGE_HW_RENDER;
 }
 
 
@@ -512,6 +515,17 @@
     return self->query(what, value);
 }
 
+int Surface::perform(android_native_window_t* window, 
+        int operation, ...)
+{
+    va_list args;
+    va_start(args, operation);
+    Surface* self = getSelf(window);
+    int res = self->perform(operation, args);
+    va_end(args);
+    return res;
+}
+
 // ----------------------------------------------------------------------------
 
 status_t Surface::dequeueBuffer(sp<SurfaceBuffer>* buffer)
@@ -561,7 +575,7 @@
 
     volatile const surface_info_t* const back = lcblk->surface + backIdx;
     if (back->flags & surface_info_t::eNeedNewBuffer) {
-        err = getBufferLocked(backIdx);
+        err = getBufferLocked(backIdx, mUsage);
     }
 
     if (err == NO_ERROR) {
@@ -627,6 +641,20 @@
     return BAD_VALUE;
 }
 
+int Surface::perform(int operation, va_list args)
+{
+    int res = NO_ERROR;
+    switch (operation) {
+        case NATIVE_WINDOW_SET_USAGE:
+            mUsage = va_arg(args, int);
+            break;
+        default:
+            res = NAME_NOT_FOUND;
+            break;
+    }
+    return res;
+}
+
 // ----------------------------------------------------------------------------
 
 status_t Surface::lock(SurfaceInfo* info, bool blocking) {
@@ -636,6 +664,9 @@
 status_t Surface::lock(SurfaceInfo* other, Region* dirtyIn, bool blocking) 
 {
     // FIXME: needs some locking here
+
+    // we're intending to do software rendering from this point
+    mUsage = GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN;
     
     sp<SurfaceBuffer> backBuffer;
     status_t err = dequeueBuffer(&backBuffer);
@@ -725,10 +756,10 @@
     mSwapRectangle = r;
 }
 
-status_t Surface::getBufferLocked(int index)
+status_t Surface::getBufferLocked(int index, int usage)
 {
     status_t err = NO_MEMORY;
-    sp<SurfaceBuffer> buffer = mSurface->getBuffer();
+    sp<SurfaceBuffer> buffer = mSurface->getBuffer(usage);
     LOGE_IF(buffer==0, "ISurface::getBuffer() returned NULL");
     if (buffer != 0) {
         sp<SurfaceBuffer>& currentBuffer(mBuffers[index]);
diff --git a/opengl/libagl/egl.cpp b/opengl/libagl/egl.cpp
index cf66be3..0762ebf 100644
--- a/opengl/libagl/egl.cpp
+++ b/opengl/libagl/egl.cpp
@@ -384,6 +384,10 @@
 
 EGLBoolean egl_window_surface_v2_t::connect() 
 {
+    // we're intending to do software rendering
+    native_window_set_usage(nativeWindow, 
+            GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN);
+
     // dequeue a buffer
     if (nativeWindow->dequeueBuffer(nativeWindow, &buffer) != NO_ERROR) {
         return setError(EGL_BAD_ALLOC, EGL_FALSE);
diff --git a/opengl/tests/filter/filter.cpp b/opengl/tests/filter/filter.cpp
index 82aafbf..2351909 100644
--- a/opengl/tests/filter/filter.cpp
+++ b/opengl/tests/filter/filter.cpp
@@ -10,6 +10,8 @@
 
 using namespace android;
 
+#define USE_DRAW_TEXTURE 1
+
 int main(int argc, char** argv)
 {
     if (argc!=2 && argc!=3) {
@@ -45,9 +47,9 @@
      dpy = eglGetDisplay(EGL_DEFAULT_DISPLAY);
      eglInitialize(dpy, &majorVersion, &minorVersion);
      if (!usePbuffer) {
-         surface = eglCreateWindowSurface(dpy, config, window, NULL);
          EGLUtils::selectConfigForNativeWindow(
                  dpy, s_configAttribs, window, &config);
+         surface = eglCreateWindowSurface(dpy, config, window, NULL);
      } else {
          printf("using pbuffer\n");
          eglChooseConfig(dpy, s_configAttribs, &config, 1, &numConfigs);
@@ -63,6 +65,12 @@
      eglQuerySurface(dpy, surface, EGL_HEIGHT, &h);
      GLint dim = w<h ? w : h;
 
+     glViewport(0, 0, w, h);
+     glMatrixMode(GL_PROJECTION);
+     glLoadIdentity();
+     glOrthof(0, w, 0, h, 0, 1);
+
+     glClearColor(0,0,0,0);
      glClear(GL_COLOR_BUFFER_BIT);
 
      GLint crop[4] = { 0, 4, 4, -4 };
@@ -128,14 +136,55 @@
          break;
      }
 
-     glDrawTexiOES(0, 0, 0, dim, dim);
+     //glDrawTexiOES(0, 0, 0, dim, dim);
+     
+     const GLfloat vertices[4][2] = {
+             { 0,    0   },
+             { 0,    dim },
+             { dim,  dim },
+             { dim,  0   }
+     };
 
+     const GLfloat texCoords[4][2] = {
+             { 0,  0 },
+             { 0,  1 },
+             { 1,  1 },
+             { 1,  0 }
+     };
+     
      if (!usePbuffer) {
          eglSwapBuffers(dpy, surface);
-     } else {
-         glFinish();
      }
      
+     glMatrixMode(GL_MODELVIEW);
+     glScissor(0,dim,dim,h-dim);
+     glDisable(GL_SCISSOR_TEST);
+     
+     for (int y=0 ; y<dim ; y++) {
+         //glDisable(GL_SCISSOR_TEST);
+         glClear(GL_COLOR_BUFFER_BIT);
+
+         //glEnable(GL_SCISSOR_TEST);
+
+#if USE_DRAW_TEXTURE && GL_OES_draw_texture
+         glDrawTexiOES(0, y, 1, dim, dim);
+#else
+         glLoadIdentity();
+         glTranslatef(0, y, 0);
+         glEnableClientState(GL_VERTEX_ARRAY);
+         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+         glVertexPointer(2, GL_FLOAT, 0, vertices);
+         glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
+         glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+#endif
+
+         if (!usePbuffer) {
+             eglSwapBuffers(dpy, surface);
+         } else {
+             glFinish();
+         }
+     }
+
      eglTerminate(dpy);
      return 0;
 }