Rajan Craveri - micron

why do jit.gl.texture, jit.gl.slab and jit.gl.pix transform negative values to positive?

I prepared a clear example patch that shows this

Hi all,
why do jit.gl.texture, jit.gl.slab and jit.gl.pix transform negative values to positive?
I prepared a clear example patch that shows this
could someone help me understand?
Thanks
micron


negative-values-to-jit-gl-texture-jit-gl-slab-and-jit-gl-pix

If you look at the planecount for the matrices in the box you outlined, they're all 4-plane meaning they have an alpha channel. The first plane is the alpha channel, which by default is all 1s. If you look at the other planes, you'll have your negative numbers. jit.gl.slab and jit.gl.pix always output a 4-plane texture because they're doing pixel processing on the GPU. jit.gl.texture can have various formats, which can be set explicitly using the @colormode attribute:

If you look at the planecount for the matrices in the box you outlined, they're all 4-plane meaning they have an alpha channel.  The first plane is the alpha channel, which by default is all 1s.  If you look at the other planes, you'll have your negative numbers.  jit.gl.slab and jit.gl.pix always output a 4-plane texture because they're doing pixel processing on the GPU.  jit.gl.texture can have various formats, which can be set explicitly using the @colormode attribute:


Thank you but the problem was Opengl readback set on rtt

after your post I changed on fob and now it works.

I have to understand better those three read back methods.

Thank you but the problem was Opengl readback set on rtt
after your post I changed on fob and now it works.
I have to understand better those three read back methods.
Thanks
micron


Negative values to jit.gl.texture, jit.gl.slab and jit.gl.pix