Hi Roland, GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT or PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT is what you're looking for. I guess the test shouldn't ignore that. The value is 256 for R600 and 4 for GCN.
Marek On Sat, Apr 18, 2015 at 5:46 AM, Roland Scheidegger <srol...@vmware.com> wrote: > Hi, > > when looking at a regression (piglit > ext_transform_feedback-immediate-reuse-uniform-buffer, bug 90081) I > realized that behavior wrt non-size-aligned constant buffers doesn't > seem to be all that clear cut. In particular I'm wondering if what the > test (or rather the state tracker) does is actually ok? > Constant buffers were always really considered to have been consisting > of vec4 of floats (they are accessed with xyzw semantics after all), > hence having a constant buffer with a size not a multiple of 16 bytes > seems rather odd. I wonder though if they need to be handled gracefully > somehow (of course, in usual GL fashion, nobody has any idea that this > spiffy 4-byte transform feedback or whatever different bind point buffer > is going to be used as a constant buffer later), or if this is something > which should be addressed elsewhere. > > Roland > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/mesa-dev _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
