Add a WAIT_FOR_GPU_COMPLETION option

Change-Id: I18d526120651676109200bfd5da87cafcd7e3d13

2 files changed, 20 insertions, 0 deletions

diff --git a/libs/hwui/renderthread/EglManager.cpp b/libs/hwui/renderthread/EglManager.cpp
index c4feb41..28aa938 100644
--- a/libs/hwui/renderthread/EglManager.cpp
+++ b/libs/hwui/renderthread/EglManager.cpp
@@ -22,10 +22,13 @@
 
 #include <cutils/log.h>
 #include <cutils/properties.h>
+#include <EGL/eglext.h>
 
 #define PROPERTY_RENDER_DIRTY_REGIONS "debug.hwui.render_dirty_regions"
 #define GLES_VERSION 2
 
+#define WAIT_FOR_GPU_COMPLETION 0
+
 // Android-specific addition that is used to show when frames began in systrace
 EGLAPI void EGLAPIENTRY eglBeginFrame(EGLDisplay dpy, EGLSurface surface);
 
@@ -263,6 +266,14 @@ void EglManager::beginFrame(EGLSurface surface, EGLint* width, EGLint* height) {
 
 bool EglManager::swapBuffers(EGLSurface surface) {
     mInFrame = false;
+
+#if WAIT_FOR_GPU_COMPLETION
+    {
+        ATRACE_NAME("Finishing GPU work");
+        fence();
+    }
+#endif
+
     eglSwapBuffers(mEglDisplay, surface);
     EGLint err = eglGetError();
     if (CC_LIKELY(err == EGL_SUCCESS)) {
@@ -281,6 +292,13 @@ bool EglManager::swapBuffers(EGLSurface surface) {
     return false;
 }
 
+void EglManager::fence() {
+    EGLSyncKHR fence = eglCreateSyncKHR(mEglDisplay, EGL_SYNC_FENCE_KHR, NULL);
+    eglClientWaitSyncKHR(mEglDisplay, fence,
+            EGL_SYNC_FLUSH_COMMANDS_BIT_KHR, EGL_FOREVER_KHR);
+    eglDestroySyncKHR(mEglDisplay, fence);
+}
+
 void EglManager::cancelFrame() {
     mInFrame = false;
 }
diff --git a/libs/hwui/renderthread/EglManager.h b/libs/hwui/renderthread/EglManager.h
index e12db3a..b1a18a9 100644
--- a/libs/hwui/renderthread/EglManager.h
+++ b/libs/hwui/renderthread/EglManager.h
@@ -55,6 +55,8 @@ public:
 
     void setTextureAtlas(const sp<GraphicBuffer>& buffer, int64_t* map, size_t mapSize);
 
+    void fence();
+
 private:
     friend class RenderThread;