Two rendering passes with different shaders in DirectX11?

Graphics and GPU Programming Programming

Started by BlurEffect March 14, 2014 12:24 PM

2 comments, last by BlurEffect 10 years, 1 month ago

BlurEffect

163

Author

March 14, 2014 12:24 PM

Hey guys,

This question is probably kind of stupid or simple but I'm having a bit of a hard time to decide how to have two rendering passes to draw my geometry. I'm creating a cel-shaded environment and I have a vertex/pixel shader for the colouring and a second pair of shaders for the rendering of black outlines. In my renderer class, I'm looping through the scene objects and draw them.

What I don't really get is the following: Some shaders I found declare a technique containing several passes in the HLSL file, is it possible to call such a technique from c++ code without using the effects framework (I read some posts discouraging people from using it). And how would I achieve the same effect without declaring a technique at all? Should I simply loop through all objects twice and switch the shader in between? Thank you very much in advance. Any advice is appreciated.

Cheers

L. Spiro

25,818

March 14, 2014 01:47 PM

is it possible to call such a technique from c++ code without using the effects framework

No. “Passes” in this context is part of the syntax of the effects framework.

And how would I achieve the same effect without declaring a technique at all? Should I simply loop through all objects twice and switch the shader in between?

If every single object is going to have this (cel-shading) done to them, then yes.
If not, there is no need to draw a second time anything that will not be cel-shaded or does not need a second pass.
Draw them once, then change shaders and draw them again.

L. Spiro

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Ashaman73

13,718

March 14, 2014 02:00 PM

Although consider a post-processing pass instead of a geometry pass (the first one often only needs a fullscreen quad to be rendered). I use a cel-shader in my game without a second geometry pass, though I use a deferred render engine to accomplish it. With a forward render engine it might be more difficult.