On 4 November 2015 at 00:54, Gilles Chanteperdrix <[email protected]> wrote: > On Tue, Nov 03, 2015 at 04:56:14PM +0000, Lionel Landwerlin wrote: >> Hi, >> >> Following your comments on the previous patch, here is an serie to add >> support for coefficients passed down to the EUs for the vpp yuv to rgb >> conversion path. > > Hi, > > sorry for intruding on the mailing list, but this is a topic on > which I worked recently. First question is: I implemented yuv to rgb > conversion using GLSL shaders (only for yuv420p, but this could be > easily implemented for other pixel formats), and the code is > relatively simple: > https://git.click-hack.org/vplayer.git/tree/lib/yuv420p_frag.glsl > What is the gain of using libva instead? > I'm no expert in the libva code so take this with a grain of salt.
For doing things the GLSL way - you have an extra GL context creation/management not to mention the overhead of parsing/compiling/linking etc the GLSL shader. While the result (from a hardware's perspective/instructions emitted) may be almost identical, doing things within i965 libva driver should be less CPU/memory intensive. Regards, Emil _______________________________________________ Libva mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/libva
