[PSA] Always initialize your shader variables!

[Nash]

With the Vulkan renderer on the horizon, you might find a little surprise with your existing shaders (be it post processing, or materials). Before panicking that your shaders "mess up in Vulkan", check one one of the most basic things:

Uninitialized variables!

For Vulkan, uninitialized variables might produce strange results in your shader. It is recommended that you always initialize your variables.

Code: Select all

// might "work" in OpenGL but produce strange results in Vulkan
vec4 newColor;

// this is safer and will ensure consistency in both OpenGL and Vulkan
vec4 newColor = vec4(0.0, 0.0, 0.0, 0.0);

it is generally recommended to initialize your variables in shaders because of how driver-dependent their behaviour can be, even with OpenGL.

Happy shading!

[Dark Jaguar]

I wonder if GZDoom is going to be renamed VZDoom? Or maybe just drop that and simply call it all "ZDoom" again?

In short, thank you for the alert! Vulkan support is sure to be interesting!

[Tormentor667]

The G doesn’t stand for GL but Graf (Zahl)

[Dark Jaguar]

The G doesn’t stand for GL but Graf (Zahl)

I have seen the truth! It is.... glorious!