GLSL/HLSL out pass through the modulus operator on integers

[kvark]

"a % b" expression gets passed through form WGSL to GLSL, e.g.

@vertex
fn main() -> @builtin(position) vec4<f32> {
	let x: i32 = -4 % 5;
	return vec4<f32>(0.0);
}

Produces:

#version 310 es

precision highp float;
precision highp int;


void main() {
    int x = (-4 % 5);
    gl_Position = vec4(0.0);
    gl_Position.yz = vec2(-gl_Position.y, gl_Position.z * 2.0 - gl_Position.w);
    return;
}

Problem is - the semantics of "%" is different. In GLSL it's "x - y * floor(x/y)", while in WGSL it's meant to be "x - y * trunc(x/y)".

Edit: same for HLSL, with a little difference that this is UB:

The % operator is defined only in cases where either both sides are positive or both sides are negative.

[teoxoy]

This has been resolved by: c584331 (gfx-rs/naga#1867) & 943235c (gfx-rs/naga#1452).