Discard framebuffer rendering queues when discarding layers

Bug #5581817

Change-Id: If612846ec5f7793710fc4df152791fb32c506551

Author: Romain Guy

core/java/android/view/GLES20Canvas.java

@@ -154,6 +154,7 @@ static native void nUpdateTextureLayer(int layerId, int width, int height, boole
     static native void nSetTextureLayerTransform(int layerId, int matrix);
     static native void nDestroyLayer(int layerId);
     static native void nDestroyLayerDeferred(int layerId);
+    static native void nFlushLayer(int layerId);
     static native boolean nCopyLayer(int layerId, int bitmap);
 
     ///////////////////////////////////////////////////////////////////////////

core/java/android/view/GLES20Layer.java

@@ -60,6 +60,13 @@ void destroy() {
         }
         mLayer = 0;
     }
+    
+    @Override
+    void flush() {
+        if (mLayer != 0) {
+            GLES20Canvas.nFlushLayer(mLayer);
+        }
+    }
 
     static class Finalizer {
         private int mLayerId;

core/java/android/view/HardwareLayer.java

@@ -115,6 +115,11 @@ boolean isOpaque() {
      */
     abstract void destroy();
 
+    /**
+     * Flush the render queue associated with this layer.
+     */
+    abstract void flush();
+
     /**
      * This must be invoked before drawing onto this layer.
      * @param currentCanvas

core/java/android/view/View.java

@@ -10146,6 +10146,12 @@ public void buildLayer() {
                 break;
         }
     }
+    
+    void flushLayer() {
+        if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) {
+            mHardwareLayer.flush();
+        }
+    }
 
     /**
      * <p>Returns a hardware layer that can be used to draw this view again
@@ -10158,6 +10164,9 @@ HardwareLayer getHardwareLayer() {
                 !mAttachInfo.mHardwareRenderer.isEnabled()) {
             return null;
         }
+        
+        if (!mAttachInfo.mHardwareRenderer.validate()) return null;
+        
 
         final int width = mRight - mLeft;
         final int height = mBottom - mTop;
@@ -10232,8 +10241,14 @@ HardwareLayer getHardwareLayer() {
      */
     boolean destroyLayer() {
         if (mHardwareLayer != null) {
-            mHardwareLayer.destroy();
-            mHardwareLayer = null;
+            AttachInfo info = mAttachInfo;
+            if (info != null && info.mHardwareRenderer != null &&
+                    info.mHardwareRenderer.isEnabled()) {
+                if (!info.mHardwareRenderer.validate()) {
+                    mHardwareLayer.destroy();
+                    mHardwareLayer = null;                    
+                }
+            }
             return true;
         }
         return false;

core/java/android/view/ViewGroup.java

@@ -2957,6 +2957,16 @@ public void setChildrenLayersEnabled(boolean enabled) {
         if (enabled != mDrawLayers) {
             mDrawLayers = enabled;
             invalidate(true);
+            
+            AttachInfo info = mAttachInfo;
+            if (info != null && info.mHardwareRenderer != null &&
+                    info.mHardwareRenderer.isEnabled()) {
+                if (!info.mHardwareRenderer.validate()) {
+                    enabled = false;
+                }
+            } else {
+                enabled = false;
+            }
 
             // We need to invalidate any child with a layer. For instance,
             // if a child is backed by a hardware layer and we disable layers
@@ -2968,6 +2978,7 @@ public void setChildrenLayersEnabled(boolean enabled) {
             for (int i = 0; i < mChildrenCount; i++) {
                 View child = mChildren[i];
                 if (child.mLayerType != LAYER_TYPE_NONE) {
+                    if (!enabled) child.flushLayer();
                     child.invalidate(true);
                 }
             }

core/jni/android_view_GLES20Canvas.cpp

@@ -718,6 +718,10 @@ static void android_view_GLES20Canvas_destroyLayerDeferred(JNIEnv* env,
     LayerRenderer::destroyLayerDeferred(layer);
 }
 
+static void android_view_GLES20Canvas_flushLayer(JNIEnv* env, jobject clazz, Layer* layer) {
+    LayerRenderer::flushLayer(layer);
+}
+
 static void android_view_GLES20Canvas_drawLayer(JNIEnv* env, jobject clazz,
         OpenGLRenderer* renderer, Layer* layer, jfloat x, jfloat y, SkPaint* paint) {
     renderer->drawLayer(layer, x, y, paint);
@@ -860,6 +864,7 @@ static JNINativeMethod gMethods[] = {
     { "nSetTextureLayerTransform", "(II)V",    (void*) android_view_GLES20Canvas_setTextureLayerTransform },
     { "nDestroyLayer",           "(I)V",       (void*) android_view_GLES20Canvas_destroyLayer },
     { "nDestroyLayerDeferred",   "(I)V",       (void*) android_view_GLES20Canvas_destroyLayerDeferred },
+    { "nFlushLayer",             "(I)V",       (void*) android_view_GLES20Canvas_flushLayer },
     { "nDrawLayer",              "(IIFFI)V",   (void*) android_view_GLES20Canvas_drawLayer },
     { "nCopyLayer",              "(II)Z",      (void*) android_view_GLES20Canvas_copyLayer },
 

libs/hwui/Android.mk

@@ -38,7 +38,7 @@ ifeq ($(USE_OPENGL_RENDERER),true)
 		external/skia/src/ports \
 		external/skia/include/utils
 
-	LOCAL_CFLAGS += -DUSE_OPENGL_RENDERER
+	LOCAL_CFLAGS += -DUSE_OPENGL_RENDERER -DGL_GLEXT_PROTOTYPES
 	LOCAL_CFLAGS += -fvisibility=hidden
 	LOCAL_MODULE_CLASS := SHARED_LIBRARIES
 	LOCAL_SHARED_LIBRARIES := libcutils libutils libGLESv2 libskia libui

libs/hwui/Extensions.h

@@ -66,6 +66,7 @@ class Extensions {
 
         mHasNPot = hasExtension("GL_OES_texture_npot");
         mHasFramebufferFetch = hasExtension("GL_NV_shader_framebuffer_fetch");
+        mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
 
         const char* vendor = (const char*) glGetString(GL_VENDOR);
         EXT_LOGD("Vendor: %s", vendor);
@@ -80,6 +81,7 @@ class Extensions {
     inline bool hasNPot() const { return mHasNPot; }
     inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }
     inline bool needsHighpTexCoords() const { return mNeedsHighpTexCoords; }
+    inline bool hasDiscardFramebuffer() const { return mHasDiscardFramebuffer; }
 
     bool hasExtension(const char* extension) const {
         const String8 s(extension);
@@ -98,6 +100,7 @@ class Extensions {
     bool mHasNPot;
     bool mNeedsHighpTexCoords;
     bool mHasFramebufferFetch;
+    bool mHasDiscardFramebuffer;
 }; // class Extensions
 
 }; // namespace uirenderer

libs/hwui/LayerRenderer.cpp

@@ -305,8 +305,10 @@ void LayerRenderer::destroyLayer(Layer* layer) {
         LAYER_RENDERER_LOGD("Recycling layer, %dx%d fbo = %d",
                 layer->getWidth(), layer->getHeight(), layer->getFbo());
 
-        if (layer->getFbo()) {
-            Caches::getInstance().fboCache.put(layer->getFbo());
+        GLuint fbo = layer->getFbo();
+        if (fbo) {
+            flushLayer(layer);
+            Caches::getInstance().fboCache.put(fbo);
         }
 
         if (!Caches::getInstance().layerCache.put(layer)) {
@@ -331,6 +333,26 @@ void LayerRenderer::destroyLayerDeferred(Layer* layer) {
     }
 }
 
+void LayerRenderer::flushLayer(Layer* layer) {
+#ifdef GL_EXT_discard_framebuffer
+    GLuint fbo = layer->getFbo();
+    if (layer && fbo) {
+        // If possible, discard any enqued operations on deferred
+        // rendering architectures
+        if (Caches::getInstance().extensions.hasDiscardFramebuffer()) {
+            GLuint previousFbo;
+            glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
+
+            GLenum attachments = GL_COLOR_ATTACHMENT0;
+            glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+            glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, &attachments);
+
+            glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
+        }
+    }
+#endif
+}
+
 bool LayerRenderer::copyLayer(Layer* layer, SkBitmap* bitmap) {
     Caches& caches = Caches::getInstance();
     if (layer && layer->isTextureLayer() && bitmap->width() <= caches.maxTextureSize &&

libs/hwui/LayerRenderer.h

@@ -61,6 +61,7 @@ class LayerRenderer: public OpenGLRenderer {
             bool isOpaque, GLenum renderTarget, float* transform);
     ANDROID_API static void destroyLayer(Layer* layer);
     ANDROID_API static void destroyLayerDeferred(Layer* layer);
+    ANDROID_API static void flushLayer(Layer* layer);
     ANDROID_API static bool copyLayer(Layer* layer, SkBitmap* bitmap);
 
 private: