Depending on the actual platform, Blender will disable features that are known to have a faulty implementation. Add-on developers or users don't have the ability to check what is actually enabled. This patch will add the ability to check for * Compute shader support `gpu.capabilities.compute_shader_support_get()`. * SSBO support `gpu.capabilities.shader_storage_buffer_objects_support_get()`. * Image load/store `gpu.capabilities.shader_image_load_store_support_get()`.