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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
010e663cc3
OpenGL GLSL, OpenGL ARB assembly shaders, and DX9 are pretty loose about the behavior in the presence of NaNs. Many GPUs that implement these specifications do not even have a representation of NaN. However, OpenCL and Vulkan SPIR-V are not so lax. Both actually have some required behavior in the presence of NaN, and, of the two, OpenCL is the most strict. For years we have implemented SPIR-V by using the same comparison opcodes as we use for OpenGL GLSL and OpenGL assembly shaders. This has repeatedly caused problems where an optimization that is valid in the NaN-relaxed world is not valid in Vulkan or OpenCL. To fix this, set the "exact" flag on comparisons instructions generated from SPIR-V. This will block optimizations that may have different NaN behavior. v2: Set the exact flag in the nir_builder, not in the vtn_builder. v3: Add an assertion in vtn_handle_constant that the exact flag wasn't set (because it's ignored). Rebase on |
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `Freenode's #dri-devel <irc://chat.freenode.net#dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.