CODEWITHSUNDEEP
openglglslshader
user4179961
user4179961

Reputation:

Integer corrupt in GLSL

I have this strange behavior in my rendering process. I'm passing an 32-bit unsigned integer as an attribute to my shader. The vertex-shader forwards this attribute as a flat uint to the fragmentshader.

In the fragment shader I do a comparison. In my case send in 1u and I compare with 1u. This doesn't generate true. Instead my value compared to

0x3F800000

generates true.

So, somehow my initial 32-bit value:

0000 0000 0000 0000 0000 0000 0000 0001

Has become:

0011 1111 1000 0000 0000 0000 0000 0000

All I'm doing is this:

Vertex:

layout(location = 3) in uint in_index
flat out uint v_index;
v_index = in_index;

Fragment:

if (v_index == 0x3F800000u){discard;}

And all fragments are discarded. I'm using core 330.

And by the way, I've used floats and shorts and they all work fine.

Upvotes: 0

Views: 304

Answers (1)

user4179961
user4179961

Reputation:

@Andon M. Coleman solved it for me!

use glVertexAttribIPointer (...) instead of glVertexAttribPointer (...).

Upvotes: 1

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