RadeonSI Gets Another OpenGL 4.5 Extension: ARB_cull_distance
Written by Michael Larabel in Mesa on 30 August 2016 at 07:55 AM EDT. 23 Comments
MESA --
The RadeonSI Gallium3D driver continues stepping ever so closely to OpenGL 4.4 and 4.5 compliance.

Yesterday landing in Mesa Git was support for ARB_cull_distance. This extension was already supported by the Intel driver, NV50/NVC0 Nouveau, and even LLVMpipe/Softpipe/SWR while finally now it's seeing the first AMD support.

ARB_cull_distance is described in detail via the OpenGL.org registry but simply put comes down to a new GLSL shader output for whole primitive culling.

RadeonSI still needs KHR_robustness for OpenGL 4.5 and then for OpenGL 4.4 needs to finish up ARB_enhanced_layouts and ARB_query_buffer_object. With the next Mesa release due out in possibly one month, it remains to be seen if these new OpenGL milestones will be achieved.
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