Default clear values for color / depth / stencil?

[BenConMS]

The D3D12 debug layer currently fires a lot of warnings about there not being default clear values. This is a feature that enhances the performance of clearing by setting it up front.

I have noticed that Vulkan apparently has the same warning / feature. It is less clear to me whether Metal does this.

I am opening an issue to consider adding this feature to NXT since it maps pretty directly to a hardware feature and multiple backends can support it.

[Kangz]

Thanks for raising this, default clear values will be important for performance, especially if we decide that the Web facing API has to act as if all resources are set to 0 when allocated.