commit ec100976e0655acaa204c8800dfb83dadae20cc8
author John Reck <jreck@google.com> Thu Apr 05 16:41:41 2018 -0700
committer John Reck <jreck@google.com> Mon Apr 09 10:58:15 2018 -0700
tree d7bd2d10c7be8ea0ccec63e85c8365efb87edfe4
parent 413293ff626301e1ee9837f247c4d7321c59f472

Add support for render-ahead

For periods of time during which latency is less important
allow a client to request a deeper render-ahead pipeline.

The latency tradeoff results in less overall visual jank

Test: none, only used by macrobench

Change-Id: I516203b70bdc75b6415fa08bf9c4fb1b598b0102

libs/hwui/renderthread/EglManager.cpp

diff --git a/libs/hwui/renderthread/EglManager.cpp b/libs/hwui/renderthread/EglManager.cpp
index 6e239e3..3a49beb 100644
--- a/libs/hwui/renderthread/EglManager.cpp
+++ b/libs/hwui/renderthread/EglManager.cpp
@@ -83,6 +83,7 @@
     bool glColorSpace = false;
     bool scRGB = false;
     bool contextPriority = false;
+    bool presentTime = false;
 } EglExtensions;
 
 EglManager::EglManager(RenderThread& thread)
@@ -170,6 +171,7 @@
     EglExtensions.scRGB = extensions.has("EGL_EXT_gl_colorspace_scrgb");
 #endif
     EglExtensions.contextPriority = extensions.has("EGL_IMG_context_priority");
+    EglExtensions.presentTime = extensions.has("EGL_ANDROID_presentation_time");
 }
 
 bool EglManager::hasEglContext() {
@@ -242,7 +244,7 @@
                              &numConfigs) ||
             numConfigs != 1) {
             ALOGE("Device claims wide gamut support, cannot find matching config, error = %s",
-                    eglErrorString());
+                  eglErrorString());
             EglExtensions.pixelFormatFloat = false;
         }
     }
@@ -437,6 +439,13 @@
         fence();
     }
 
+    if (EglExtensions.presentTime && Properties::usePresentTime) {
+        if (!eglPresentationTimeANDROID(mEglDisplay, frame.mSurface, frame.mPresentTime)) {
+            LOG_ALWAYS_FATAL("Failed to set presentation time on surface %p, error=%s",
+                             (void*)frame.mSurface, eglErrorString());
+        }
+    }
+
     EGLint rects[4];
     frame.map(screenDirty, rects);
     eglSwapBuffersWithDamageKHR(mEglDisplay, frame.mSurface, rects, screenDirty.isEmpty() ? 0 : 1);