Add support for EXT_image_flush_external extension

third_party/khronos/EGL/eglext.h

Index: third_party/khronos/EGL/eglext.h
diff --git a/third_party/khronos/EGL/eglext.h b/third_party/khronos/EGL/eglext.h
index b476dc59057f578d40a78cf4f904865f3c857241..831e3d8b1b9aa95795f7a50f4bd4af72873cac4f 100644
--- a/third_party/khronos/EGL/eglext.h
+++ b/third_party/khronos/EGL/eglext.h
@@ -574,6 +574,18 @@ typedef EGLint (EGLAPIENTRYP PFNEGLDUPNATIVEFENCEFDANDROIDPROC)(EGLDisplay dpy,
 #define EGL_SYNC_PRIOR_COMMANDS_IMPLICIT_EXTERNAL_ARM 0x328A
 #endif /* EGL_ARM_implicit_external_sync */
 
+
+#ifndef EGL_EXT_image_flush_external
+#define EGL_EXT_image_flush_external 1
+#define EGL_IMAGE_EXTERNAL_TARGET_NVX	0x3330
+#define EGL_DECOMPRESSED_NVX		0x3331

[piman, 2016/06/29 17:34:50]

How come an EXT extension has _NVX enums in them?
This doesn't look like an official EXT extension, it's not in the Khronos
registry...

Is there documentation for that extension somewhere?

[vinceh, 2016/06/30 09:22:48]

It's in
https://docs.google.com/document/d/1Z3P00qyjI7R5LYA2T9qYzmXymm1NOTbcoFbEod_GD...
.

The enums is actually from NVIDIA's EGL_EXT_image_flush_external extension since
I did not have ideas for the names. Could you suggest in the Google doc above?

[piman, 2016/06/30 18:18:58]

EGL_EXT_image_flush_external, as described in the document, and being an EXT
extension, doesn't/shouldn't include those enums.
Perhaps you mean you want a layered extension on top of it that adds
NVIDIA-specific attributes, but it should be specced separately, and queried
separately.
From my discussions with marcheu@, eglImageFlushExternalEXT is intended to work
without driver-specific attributes.

+#ifdef EGL_EGLEXT_PROTOTYPES
+EGLAPI EGLBoolean EGLAPIENTRY eglImageFlushExternalEXT(EGLDisplay dpy, EGLImageKHR image, const EGLint *attrib_list);
+#else
+typedef EGLBoolean (EGLAPIENTRYP PFNGLEGLIMAGEFLUSHEXTERNALEXT) (EGLDisplay dpy, EGLImageKHR image, const EGLint *attrib_list);
+#endif
+#endif
+
 #ifdef __cplusplus
 }
 #endif