Bug 92236

Summary:	[ColorTiling2D] R600 BARTS radeon: pipe_context->clear with color tiling enabled doesn't immediately affect color buffer
Product:	Mesa	Reporter:	Patrick Rudolph <siro>
Component:	Mesa core	Assignee:	mesa-dev
Status:	RESOLVED NOTOURBUG	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium
Version:	git
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Patrick Rudolph 2015-10-02 08:04:01 UTC

There's an open Gallium nine bug: https://github.com/iXit/Mesa-3D/issues/138

It looks like pipe_context->clear called with PIPE_CLEAR_COLOR isn't applied immediately to the buffer.
As nine mimics swap-chains, the buffer is reused after some frames resulting in "delayed" presentation.

The problem doesn't exist with R600_DEBUG=notiling and it doesn't exists when using pipe_context->clear_render_target instead.

Tested with mesa git: https://github.com/iXit/Mesa-3D/

Comment 1 Michel Dänzer 2015-10-02 08:16:29 UTC

(In reply to Patrick Rudolph from comment #0)
> There's an open Gallium nine bug: https://github.com/iXit/Mesa-3D/issues/138
> 
> It looks like pipe_context->clear called with PIPE_CLEAR_COLOR isn't applied
> immediately to the buffer.

That's correct. nine needs to resolve the clear using the pipe->flush_resource hook.


> The problem doesn't exist with R600_DEBUG=notiling

Fast clear only works with tiled surfaces.


> and it doesn't exists when using pipe_context->clear_render_target instead.

IIRC that's currently a software fallback.

Comment 2 Axel Davy 2015-10-02 08:25:53 UTC

(In reply to Michel Dänzer from comment #1)
> That's correct. nine needs to resolve the clear using the
> pipe->flush_resource hook.
> 

Nine does call it before sending the buffer to the server.

Comment 3 Axel Davy 2015-10-02 08:42:52 UTC

Ok, after discussion with Michel we realized the problem is that flush_resource should be called before flushing, and not after.

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