Re: [Intel-gfx] [RFC 1/1] drm/i915: Added support for setting plane alpha through drm property

On Thu, Mar 6, 2014 at 11:28 AM, Sagar Arun Kamble sagar.a.kamble@intel.com wrote:

We can only model GL_CONSTANT_ALPHA given we have sprite control registers for that. How do we model other pixel arithmetic related to color blending? How do we model source and destination pixel arithmetic? We can only set alpha/pre-multiplied alpha for individual planes.

We reject it if userspace attempts it ;-) But we kinda want a model which also works for the next few hw platforms and also on other drivers, so going with this sounds like the right approach to me. -Daniel