What about implementing GL spec on top of Direct3D, and preserving deprecated features. This way implementation will be easier and reliable since it will be built on top of a reliable pipeline and drivers. GLSL can be compiled into equivalent HLSL 
What about implementing GL spec on top of Direct3D, and preserving deprecated features. This way implementation will be easier and reliable since it will be built on top of a reliable pipeline and drivers. GLSL can be compiled into equivalent HLSL