On June 7, 2018 16:47:17 Ilia Mirkin <imir...@alum.mit.edu> wrote:
On Thu, Jun 7, 2018 at 7:31 PM, Fritz Koenig <frkoe...@google.com> wrote:
On Thu, Jun 7, 2018 at 4:10 PM Ilia Mirkin <imir...@alum.mit.edu> wrote:
It's slightly different than what you've specified, but can't you
achieve this with GL_ARB_clip_control / GL_EXT_clip_control ?
It can be, but there is a lot of extra work that needs to be done to
get ReadPixels to work correctly. It would be preferable to have the
driver handle all of that work.
A bit more prior art research:
GL_MESA_pack_invert - specifies this precisely for glReadPixels.
Your version of the spec needs more information. What does "flipped"
mean? Does it affect gl_FragCoord / gl_SamplePosition /
interpolateAtOffset? Does it affect the winding?
Might help to say that this is designed to undo the winsys flipping
relative to fbo rendering.
More designed to emulate winsys flipping on a texture that isn't flipped.
Basically, everything is "like normal" except that the result of your
rendering is flipped vertically in the texture. It's a bit wired but
that's the idea.
--Jason
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