• State Accepted Answer
  • Locked Locked
  • Replies 8 replies
  • Subscribers 137 subscribers
  • Views 19913 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Is there practical examples of Half-float (FP16) ?

Myy

Greetings,

After reading“PHENOMENAL COSMIC POWERS! Itty-bitty living space!” from edplowman, I'm wondering how the FP16 type can actually be used ?

When reading the ARMv7 and ARMv8 architectures manuals, the only instructions that I found to refer to half-precision floating-points are VCVT (ARMv7) or FCVT (ARMv8).

So, my questions are :

  • Can CPU do anything with half-precision floating points beside converting them ? Can you add/subtract/multiply/divide half-precision floating-points natively ?
  • How do you use half-precision floating points values efficiently with OpenGL ? Do you do all the operations with single-precision floats and do a conversion before sending the data to the GPU ?
  • Is there any example showing how to use this data type efficiently ?
Parents
  • 0 Arm Employee Badge in reply to Myy

    See previous answer:

     

    In general for anything related to position (texture coordinates, vertex positions, uniform matrices for position transform, distance computation for lighting, etc) we'd generally recommend using highp/fp32. For anything related to color, or intermediate values which will turn in to a color at some point (such as normals for lighting) then fp16 is probably fine.

    =)

Reply
  • 0 Arm Employee Badge in reply to Myy

    See previous answer:

     

    In general for anything related to position (texture coordinates, vertex positions, uniform matrices for position transform, distance computation for lighting, etc) we'd generally recommend using highp/fp32. For anything related to color, or intermediate values which will turn in to a color at some point (such as normals for lighting) then fp16 is probably fine.

    =)

Children