egl/android: Implement EGL_KHR_mutable_render_buffer

Specifically, implement the extension DRI_MutableRenderBufferLoader.
However, the loader enables EGL_KHR_mutable_render_buffer only if the
DRI driver implements its half of the extension,
DRI_MutableRenderBufferDriver.

Testing:
  - No change in dEQP-EGL.functional.* on Fedora 27, Wayland, Skylake
    GT2.  Used deqp at tag android-p-preview-5.
  - No change in dEQP-EGL.functional.*, ran on Android on Chrome OS,
    Kabylake GT2.
  - Manually inspected Android apps on same Chrome OS device.

Reviewed-by: Tapani Pälli <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/egl/drivers/dri2/egl_dri2.h b/src/egl/drivers/dri2/egl_dri2.h
index 95572565823..d1e4e8dcf22 100644
--- a/src/egl/drivers/dri2/egl_dri2.h
+++ b/src/egl/drivers/dri2/egl_dri2.h
@@ -151,6 +151,12 @@ struct dri2_egl_display_vtbl {
    __DRIdrawable *(*get_dri_drawable)(_EGLSurface *surf);
 
    void (*close_screen_notify)(_EGLDisplay *dpy);
+
+   /* Used in EGL_KHR_mutable_render_buffer to update the native window's
+    * shared buffer mode.
+    */
+   bool (*set_shared_buffer_mode)(_EGLDisplay *dpy, _EGLSurface *surf,
+                                  bool mode);
 };
 
 struct dri2_egl_display
@@ -178,6 +184,7 @@ struct dri2_egl_display
    const __DRI2blobExtension *blob;
    const __DRI2rendererQueryExtension *rendererQuery;
    const __DRI2interopExtension *interop;
+   const __DRImutableRenderBufferDriverExtension *mutable_render_buffer;
    int                       fd;
 
    /* dri2_initialize/dri2_terminate increment/decrement this count, so does