"Global" RenderStates

[emilk]

Currently RenderStates is part of the material. For my use case it would make much more sense to be able to set one RenderStates for everything I want to render (i.e. pass it as an argument to three_d::render_pass.

In particular, I want to set a clip region (different each frame), and it is weird to have to mutate each of my allocated meshes to be able to do so.

Perhaps there are circumstances where it makes sense to have RenderStates be tied to the material (though I find it hard to come up with a situation). To support those cases, perhaps we can change *Material::render_states into an Option<RenderStates>?

[asny]

You're right, it doesn't make sense to specify clip for each material, it's a leftover from the time where the render states was given as argument to each render call. It should be specified when starting to write to a render target. And then removed from each material. Will do it in combination with #200 . Also this is related to #76 .

Does that solve your problem or do you need other global render states? I think most of them makes sense that they are tied to a material, or at least can be specified from a material, but I could also imagine that you wanted to specify some of them globally, for example write mask.

[emilk]

That sounds good to me! For me it is only the clip/scissor rect I currently want to remove form the material; I haven't thought through the others.

[asny]

I'll start with clip/scissor then and keep the others on the material. I'll have something soon 🙂

[asny]

Just merged the changes, so now you can specify a ScissorBox when writing to a render target (screen or textures).