Render from tbuffer to tbuffer?

Graphics and GPU Programming Programming

Started by Tispe February 07, 2015 01:57 AM

1 comment, last by MJP 9 years, 2 months ago

Tispe

1,468

Author

February 07, 2015 01:57 AM

Hello!

In my vertex shader I am using two tbuffers. The first tbuffer is an array of World transform matrices, used for normal transformations for lighting. The other tbuffer is an array of WorldViewProjection matrices, used for transforming vertex positions.

What I do now is to calculate both matrix arrays on the CPU and send them to the GPU. However, I figured that I could just generate the second tbuffer from first tbuffer on the GPU by multipling every element in the first tbuffer with a ViewProjection matrix that is located in a cbuffer.

What ways are there to implement "tbuffer2 = tbuffer1 * cbuffer.ViewProj;" on the GPU?

Cheers!

Hodgman

52,717

February 07, 2015 02:04 AM

You could bind the second/output buffer to a "stream out" slot, and then use a vertex shader to read the first buffer, perform the calculation, and stream-out the results.

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MJP

20,295

February 07, 2015 02:22 AM

By far the easiest way to do this would be to use structured buffers instead of tbuffers, and then writing a compute shader to do the matrix multiply. A structured buffer will give you the same performance characteristics, except with much more flexibility. They're also easier to work with, IMO.

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Render from tbuffer to tbuffer?

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