cmake: add ENABLE_EGL_ASYNC_BUFFER_SWAPPING option (sony#362)

This change adds ENABLE_EGL_ASYNC_BUFFER_SWAPPING not to sync compositor redraw (vblank).

Related issue sony#220

Signed-off-by: Hidenori Matsubayashi <[email protected]>

Author: HidenoriMatsubayashi

CMakeLists.txt

@@ -15,6 +15,7 @@ option(USE_DIRTY_REGION_MANAGEMENT "Use Flutter dirty region management" ON)
 option(USE_GLES3 "Use OpenGL ES3 (default is OpenGL ES2)" OFF)
 option(ENABLE_EGL_ALPHA_COMPONENT_OF_COLOR_BUFFER "Enable alpha component of the EGL color buffer" ON)
 option(ENABLE_VSYNC "Enable embedder vsync" ON)
+option(ENABLE_EGL_ASYNC_BUFFER_SWAPPING "Do not sync to compositor redraw (eglSwapInterval 0)" OFF)
 option(BUILD_ELINUX_SO "Build .so file of elinux embedder" OFF)
 option(ENABLE_ELINUX_EMBEDDER_LOG "Enable logger of eLinux embedder" ON)
 option(FLUTTER_RELEASE "Build Flutter Engine with release mode" OFF)

cmake/build.cmake

@@ -118,6 +118,13 @@ if(ENABLE_VSYNC)
   )
 endif()
 
+# Do not sync to compositor redraw (eglSwapInterval 0).
+if(ENABLE_EGL_ASYNC_BUFFER_SWAPPING)
+  add_definitions(
+    -DENABLE_EGL_ASYNC_BUFFER_SWAPPING
+  )
+endif()
+
 # Enable alpha component of the egl color buffer.
 if(ENABLE_EGL_ALPHA_COMPONENT_OF_COLOR_BUFFER)
   add_definitions(