Patches For FP64 Support For OpenGL 3.0 GPUs On Mesa
Written by Michael Larabel in Mesa on 3 March 2017 at 11:56 AM EST. 25 Comments
Soft/emulated ARB_gpu_shader_fp64 support for GPUs not natively implementing double-precision/FP64 support is getting close in Mesa.

Elie Tournier, the student developer who last year was working on a soft implementation of FP64 for Mesa drivers like most of the hardware covered by R600g, recently joined Collabora and has been renewing his work on soft GL_ARB_gpu_shader_fp64 for Mesa.

With a set of 11 patches posted today that amount to over 25 thousand lines of new code, GL_ARB_shader_fp64 support can be exposed for all OpenGL 3.0 GPUs by doing the FP64 operations with pure GLSL. GL_ARB_shader_fp64 is mandated for OpenGL 4.0.

The patches up for testing can be found on Mesa-dev. This will be a big win for R600g users in particular as aside from Radeon HD 5800/6900 series, the rest of the HD 5000/6000 series line-up doesn't offer FP64 support and thus they are bound to OpenGL 3.3 rather than GL4. With this soft support, these other GPUs could get up to OpenGL 4.1.
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