Fatal error C9999: unexpected expression in DUI_foreachId

[TooGood]

I am getting this error in a compute shader and I have no clue what this means, I have this code

void main()
{
	ivec2 Coordinate = ivec2(gl_GlobalInvocationID.xy);

	vec3 LightDirection = vec3(0.0, -1.0, 0.0);

    RayPayload Payload = DispatchShadowRay(Coordinate, LightDirection);
    float ShadowVal = 0.0;


    if(!Payload.InLight)
        ShadowVal = 0.5;
    
   imageStore(ShadowBuffer, Coordinate, vec4(ShadowVal));

}

this code works fine but if I introduce another DispatchShadowRay Function

RayPayload Payload = DispatchShadowRay(Coordinate, LightDirection);
RayPayload Payload2 = DispatchShadowRay(Coordinate, LightDirection);

as an example I get the error fatal error C9999: unexpected expression in DUI_foreachId. I did some googling and couldn’t seem to find an error for that this actually means. I think its talking about the global invocation ID but I don’t understand why introducing extra code/function like that can cause this.

[TooGood]

Edit: On my AMD integrated graphics it works but on my dedicated NVidia gpu it doesn’t work. I updated the drivers on my dedicated GPU and it still isn’t working.

[Dark_Photon]

Interesting.

A few websearch hits:

• NVIDIA Shield: reliable graphics? | by Alastair Donaldson | Medium

Compile failures

Our tests trigger a number of compile failures on the Shield devices, which turn up as both compile errors and link errors in our results tables.

Some of these are cases of the driver complaining about the syntax of valid shaders, and others are fatal internal errors, for example:

(0) : fatal error C9999: unexpected expression in DUI_foreachId

One compile error is an instance of the NVIDIA driver doing stricter checking of array accesses than the OpenGL EL shading language specification requires, and NVIDIA might have good reason to favor stricter-than-necessary checking.

• Shadows: DUI_foreachId error when using blur factor · Issue #779 · gwaldron/osgearth · GitHub

(0) : fatal error C9999: unexpected expression in DUI_foreachId

Worked around by refactoring code

• fatal error C9999: unexpected expression in DUI_foreachId · Issue #3 · mc-imperial/shader-compiler-bugs · GitHub

Fragment info
-------------
(0) : fatal error C9999: unexpected expression in DUI_foreachId

Reported: https://devtalk.nvidia.com/default/topic/977912/opengl-es/-bug-glsl-link-error-for-valid-shader-quot-fatal-error-c9999-unexpected-expression-in-dui_foreachid-quot-/
…
We confirmed this was fixed. Version: 5.2(24.28.403.127)