kc3-lang/angle

2020-12-16T21:10:37

Allow Drawing with Immutable Persistent Mapped Buffers From the EXT_buffer_storage overview: The GL_EXT_texture_storage extension added immutable storage for texture objects (and was subsequently incorporated into OpenGL ES 3.0). This extension further applies the concept of immutable storage to buffer objects. [T]his extension introduces the concept of persistent client mappings of buffer objects, which allow clients to retain pointers to a buffer's data store returned as the result of a mapping, and to issue drawing commands while those mappings are in place. The initial implementation of EXT_buffer_storage didn't enable this portion of the extension, so ANGLE is generating errors while attempting to draw with an immutable buffer mapped with the GL_MAP_PERSISTENT_BIT flag. This CL enables that functionality, since apps (e.g., FIFA Soccer) rely on it. Bug: angleproject:5473 Change-Id: Icf1c0597156044a342aac5e4d2abbc29b34f46b2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2596957 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Tim Van Patten <timvp@google.com>