[Mesa-dev] [PATCH RFC v1] i965: Implement CopyTexSubImage2D via BLORP (and use it by default).

Eric Anholt eric at anholt.net
Mon Jan 21 00:55:34 PST 2013

Paul Berry <stereotype441 at gmail.com> writes:

> On 19 January 2013 11:06, Kenneth Graunke <kenneth at whitecape.org> wrote:
>> +   //intel_renderbuffer_set_needs_downsample(dst_irb);
> I'm ok leaving this out--at the moment there's no way this code can be hit
> for a multisampled destination image.  However, if we ever get around to
> implementing the GLES extension EXT_multisampled_render_to_texture, we'll
> have to have a hard think about what the correct behaviour should be.
> Perhaps we should put a comment here saying something like:
> /* Note: there is no need to call intel_renderbuffer_set_needs_downsample()
> on the destination buffer, since automatic downsample is only needed for
> multisampled window system framebuffers, which are not allowed as
> destinations for CopyTexSubImage.  However, this will need to be revisited
> if we ever support EXT_multisampled_render_to_texture. */

Isn't that extension all about multisampled user framebuffers, not
window system framebuffers?
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