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rendering system design

General and Gameplay Programming Programming

Started by RuggeroVisintin June 17, 2015 09:51 AM

4 comments, last by RuggeroVisintin 8 years, 10 months ago

RuggeroVisintin

183

Author

June 17, 2015 09:51 AM

Hi all,

I'm a little stuck on the design of the Rendering System, specifically I'm not sure how to manage the interaction between a renderMesh and a renderMaterial.

A renderMesh contains handles to the buffers that have to be sent to the GPU (vbo, ibo, etc) plus a pointer to a renderMaterial (just a single material for now).

My doubt came when i think on how to manage instanced rendering, of course a mesh can be rendered multiple times but how can I design the renderSystem so that multiple instances of the same mesh can have different materials?

L. Spiro

25,818

June 17, 2015 10:18 AM

how can I design the renderSystem so that multiple instances of the same mesh can have different materials?

Put all materials into the shader and reference them via instance index for each model.

L. Spiro

I restore Nintendo 64 video-game OST’s into HD! https://www.youtube.com/channel/UCCtX_wedtZ5BoyQBXEhnVZw/playlists?view=1&sort=lad&flow=grid

AgentC

2,476

June 17, 2015 10:28 AM

Or if the materials need a different shader, build instance queues/buckets on the CPU before rendering so that the queue key is a combination of the mesh pointer and the material pointer.

e.g. queue 1 contains instances of mesh A with material A, these will be rendered with one instanced draw call

queue 2 contains mesh A with material B, another draw call for them

...

I'd only put a "default material" pointer to the actual mesh resource, and allow the mesh scene nodes (instances) to override that.

Github: https://github.com/cadaver C64 development: http://covertbitops.c64.org/

RuggeroVisintin

183

Author

June 17, 2015 11:28 AM

I think I got it.

I would like to ask you another little thing if possible, the vertexBufferHandle is a reference counted pointer, is it a good solution? are there better solutions?

Thanks for your patience

Kraecker

693

June 17, 2015 12:26 PM

I personally like the concept, that's explained here: https://molecularmusings.wordpress.com/2013/05/02/adventures-in-data-oriented-design-part-3a-ownership/

RuggeroVisintin

183

Author

June 17, 2015 01:04 PM

I personally like the concept, that's explained here: https://molecularmusings.wordpress.com/2013/05/02/adventures-in-data-oriented-design-part-3a-ownership/

Well, is what I was thinking about, thanks for the advice, I use to visit this blog but i missed this specific article, thanks again.

rendering system design

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