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Quick DrawIndexed/DrawIndexedInstanced question

Graphics and GPU Programming Programming DX11

Started by KaiserJohan August 22, 2017 11:17 PM

4 comments, last by SoldierOfLight 6 years, 7 months ago

KaiserJohan

2,320

Author

August 22, 2017 11:17 PM

Just a really quick question - is there any overhead to using DrawIndexedInstanced even for geometry you just render once vs using DrawIndexed? Or is the details obfuscated by the graphics driver?

I would assume no but you never know

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619

August 23, 2017 12:28 AM

I would assume its only minor. With instanced you need to load another buffer into the GPU to be referenced. BUT, for single draw you need to reference a constant buffer with the related Matrix in it for transformation.

DrawInstanced although a little more work would be the best way forward, especially as you could pack all your instance matrices into 1 buffer for all your different models, and just reference an offset.

Indie game developer - Game WIP

Strafe (Working Title) - Currently in need of another developer and modeler/graphic artist (professional & amateur's artists welcome)

Insane Software Facebook

52,717

August 23, 2017 12:31 AM

FWIW in D3D12 they got rid of the non-instanced functions and now only have DrawIndexedInstanced / DrawInstanced

. 22 Racing Series .

619

August 23, 2017 12:32 AM

Just now, Hodgman said:

FWIW in D3D12 they got rid of the non-instanced functions and now only have DrawIndexedInstanced / DrawInstanced

I would assume because non instanced just doesn't offer up much more, did they optimise DX 12 for instanced versions?

Indie game developer - Game WIP

Strafe (Working Title) - Currently in need of another developer and modeler/graphic artist (professional & amateur's artists welcome)

Insane Software Facebook

SoldierOfLight

2,378

August 23, 2017 12:33 AM

DrawIndexed = DrawIndexedInstanced with instance count set to 1.

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