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There are many GPUs with no double precision floating point support in hardware. Modern ones can probably emulate it. Older ones don't have any explicit support
by modeless 6y ago
There are many GPUs with no double precision floating point support in hardware. Modern ones can probably emulate it. Older ones don't have any explicit support. Most real time 3D renderers do not use double precision at all.
- gbrown_ 6y ago> There are many GPUs with no double precision floating point support in hardware. Which ones? I'm genuinely curious about this.
- modeless 6y agoI think all of the ones listed as DirectX 10.1 or lower on this page: https://en.wikipedia.org/wiki/Feature_levels_in_Direct3D https://en.wikipedia.org/wiki/Feature_levels_in_Direct3D Those are all quite old now of course, but even modern GPUs may not have 64-bit ALUs and rely on emulation instead. Intel Gen11 in Ice Lake, for example: https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-icllp-vol04-configurations_0.pdf https://01.org/sites/default/files/documentation/intel-gfx-p... In mobile architectures 64-bit ALUs can be an optional feature that is omitted for lower end configurations. I know this is true of PowerVR.
- gbrown_ 6y agoAh interesting to know about Gen11, thanks for the links.