Is GLM fast enough for games?

Pieisgood · 2013-05-31T14:34:43

So I'm starting work on a little game engine with a friend of mine. As of now I'm tasked with the graphics side of things. I am willing and able to write the proper vector, matrix and quaternion classes with SIMD/SSE but GLM seems attractive. What I would like to know is, is GLM fast? fast enough for a simple game? Are there benchmarks to compare it with someones native code? Obviously if it's fast it might just be advantageous to use GLM instead of writing and debugging my own stuff. Another question is, would there be compatibility or speed issues using GLM with Direct3D? Thanks a ton.

For Beginners

Started by Pieisgood May 30, 2013 01:28 AM

9 comments, last by RobTheBloke 10 years, 10 months ago

JWalsh

498

May 30, 2013 05:54 PM

In your original post you asked about compatibility issues between GLM and Direct3D. If you're going to be using Direct3D for your graphics, just use DirectXMath for your math library.

DirectXMath is the public version of XNA Math - the math library that's part of the Xbox 360 Dev Kit (XDK) used by game companies to develop Xbox 360 games. It already utilizes SSE and SSE2 instructions and is about as fast as you can get.

Cheers and good luck!

Jeromy Walsh
Sr. Tools & Engine Programmer | Software Engineer
Microsoft Windows Phone Team
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RobTheBloke

2,553

May 31, 2013 02:34 PM

It already utilizes SSE and SSE2 instructions and is about as fast as you can get.

*Some* of it utilizes SSE, but you'd need to use the aligned types to make the most out of it. Even then, it's not as fast as you can get, for that you'd need SOA data structures.

Is GLM fast enough for games?

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