Start RenderThread earlier to preload Vulkan/EGL drivers

This CL should fix application startup regression for Vulkan
detected by "Hermetic Startup: EmptyActivity" test.
EGL drivers are loaded in a temp thread to leave more time
in RenderThread for other work. Loading EGL drivers
on the RenderThread may cause a perf regression.

Test: Ran cold-dropcache-test test.
Bug: 122659224
Bug: 123361175
Change-Id: I8ca818e98fac196a41d079be15594caca5cb1bab

1 files changed, 12 insertions, 0 deletions

diff --git a/graphics/java/android/graphics/HardwareRenderer.java b/graphics/java/android/graphics/HardwareRenderer.java
index 99d8c1b42a4a..b020556cd15f 100644
--- a/graphics/java/android/graphics/HardwareRenderer.java
+++ b/graphics/java/android/graphics/HardwareRenderer.java
@@ -1027,6 +1027,18 @@ public class HardwareRenderer {
      */
     public static native void disableVsync();
 
+    /**
+     * Start render thread and initialize EGL or Vulkan.
+     *
+     * Initializing EGL involves loading and initializing the graphics driver. Some drivers take
+     * several 10s of milliseconds to do this, so doing it on-demand when an app tries to render
+     * its first frame adds directly to user-visible app launch latency.
+     *
+     * Should only be called after GraphicsEnvironment.chooseDriver().
+     * @hide
+     */
+    public static native void preload();
+
     /** @hide */
     protected static native void setupShadersDiskCache(String cacheFile, String skiaCacheFile);