This is needed for antialiased multiview rendering. The extension is written against OpenGL ES 3.1. To add support for it in OpenGL ES 3.0, an extension for exposing non-array multisample textures will also be required (ANGLE_texture_multisample). This has been previously proposed though not yet submitted to ANGLE. The extension spec provides robustness guarantees for sampling multisample textures. It still needs to be tested whether native implementations follow these guarantees or if the spec needs to be adjusted to allow for clamping coordinates. The native KHR_robust_buffer_access_behavior is not very explicit about whether the texel fetch robustness applies also to multisample textures. BUG=angleproject:2775 Change-Id: I1bd721008a10bee29f8e2e06edca19370a9932a7 Reviewed-on: https://chromium-review.googlesource.com/1186336Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>