[Interest] When running our Qt 6 application on a AMD RX 7600 shaders file to load

[Nuno Santos]

Hi,

I have opened the following bug report because I couldn’t attach the example zip on the email:

https://bugreports.qt.io/browse/QTBUG-126734

Thank you!

Best regards,

Nuno

> On 27 Jun 2024, at 15:20, Nuno Santos <nuno.santos at imaginando.pt> wrote:
> 
> Hi,
> 
> After spending the two last days trying to understand the cause of this problem this is what I have found and it is still very puzzling.
> 
> - The example Scene Graph - Graph works when compiled with my custom compiled from the source Qt 6.6.3 kit on the RX 7600
> - If I use exactly the same vert and frag shaders from the Scene Graph - Graph example on my application, I no longer have the error:
> 
>> failed to link shader program: error: fail to build reflection info
> 
> - If I add or remove a single field from the uniforms structure, the error returns.
> 
> If in the Scene Graph - Graph example I add the field resolution to the noisy.frag uniforms and compile it again, just like this:
> 
> layout(std140, binding = 0) uniform buf {
>  mat4 qt_Matrix;
>  vec4 color;
>  vec2 textureSize;
>  float qt_Opacity;
>  vec2 resolution; // added field
> };
> 
> The noisy node fails to pain with the same error:
> 
>> failed to link shader program: error: fail to build reflection info
> 
> 
> So the cause of problem is the customisation of the uniforms structure. Once again, this only happens on the RX 7600. It is working perfectly for Apple Silicon, Intel Graphics, NVIDIA. 
> 
> So, now my questions are:
> 
> - Is there anything else that is not stated in the documentation that serves as validation for the uniforms structure that? 
> - Is there anything particular to AMD graphics cards that could possibly causing this problem?
> 
> 
> I’m not completely in the dark now but I still don’t have a clue of what is going on.
> 
> Maybe its time to fill a bug report now?
> 
> Please advise.
> 
> Thank you!
> 
> Best regards,
> 
> Nuno
> 
>> On 25 Jun 2024, at 15:19, Nuno Santos <nuno.santos at imaginando.pt> wrote:
>> 
>> Hi,
>> 
>> I’m having an issue. I’m pretty sure this will be a basic one. 
>> 
>> I’m rewriting VS - Visual Synthesizer to Qt 6. VS consists in a set of frag shaders that are layered to compose a visual scene that reacts to music
>> 
>> There is a factory bank with several of this shaders. With Qt 6 we are still using OpenGL for previous compatibility but the shaders are being compiled to qsb.
>> 
>> It is working on Apple Silicon, Windows PC with Intel Card, NVIDIA card but with an AMD card it is saying:
>> 
>> failed to build graphics pipeline state
>> failed to link shader program: error: fail to build reflection info
>> 
>> Am I missing something? Maybe during the shader compilation to qsb?
>> 
>> Thank you!
>> 
>> Best regards,
>> 
>> Nuno Santos
>> 
>> 
> 

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