GL_ARB_compute_variable_group_size on i965. GL_EXT_depth_bounds_test on Iris. GL_EXT_texture_shadow_lod on radeonsi, nvc0. GL_NV_alpha_to_coverage_dither_control on radeonsi GL_NV_copy_image on all gallium drivers. GL_NV_pixel_buffer_object on all gallium drivers, i915, i965, swrast. GL_NV_viewport_array2 on nvc0 (GM200+). GL_NV_viewport_swizzle on nvc0 (GM200+). VK_AMD_memory_overallocation_behavior on RADV. VK_KHR_shader_non_semantic_info on Intel, RADV. GL_EXT_draw_instanced on gles2 VK_KHR_8bit_storage for ACO on GFX8+ VK_KHR_16bit_storage for ACO on GFX8+ (storageInputOutput16 is still unsupported) shaderInt16 for ACO on GFX9+ VK_KHR_shader_float16_int8 for ACO on GFX8+ (shaderFloat16 is still unsupported) VK_EXT_robustness2 on Intel, RADV.