GL_ARB_compute_variable_group_size on Iris.
GL_ARB_gpu_shader5 on llvmpipe
GL 4.2 on llvmpipe
GL_EXT_shader_group_vote on GLES3.
VK_AMD_texture_gather_bias_lod on RADV.
VK_AMD_gpu_shader_half_float on RADV/ACO.
VK_AMD_gpu_shader_int16 on RADV/ACO.
VK_EXT_private_data on ANV and RADV.
VK_EXT_custom_border_color on ANV and RADV.
VK_EXT_pipeline_creation_cache_control on ANV and RADV.
VK_EXT_shader_demote_to_helper_invocation on RADV/LLVM.
VK_EXT_subgroup_size_control on RADV/ACO.
VK_GOOGLE_user_type on ANV and RADV.
VK_KHR_shader_subgroup_extended_types on RADV/ACO.
GL_ARB_gl_spirv on nvc0/nir.
GL_ARB_spirv_extensions on nvc0/nir.
RADV now uses ACO per default as backend
RADV_DEBUG=llvm option to enable LLVM backend for RADV