Reflection problem

More details.

I have used vertFunc.GetVertexAttributes(); to build a VertexDescriptor, but the key thing is the globals buffer at the head of each shader.

When trying to get a reflection pointer to parse this I get the error.

Attribute at index 0 references a buffer at index 0 that has no stride.

But I need the reflection to be able to work out the stride.

Hello.

We have a similar setup as you describe for our shaders.

I got the reflection thing working by setting up dummy vertex attributes (see lines 7 to 12).

I am able to read all the uniforms, structures and offsets with this code.

    {
        MTLRenderPipelineReflection* reflection;


        // Make fake descriptor
        MTLVertexDescriptor *vd = [MTLVertexDescriptor new];
        for ( int i = 0; i < 10; ++i )
        {
            vd.attributes[i].format = MTLVertexFormatFloat;
            vd.attributes[i].bufferIndex = 0;
            vd.attributes[i].offset = i*4;
        }
        vd.layouts[0].stride = (int)10*4;
        vd.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
        
        // Create pipeline to get refelction info
        MTLRenderPipelineDescriptor *descriptor = [MTLRenderPipelineDescriptor new];
        descriptor.vertexDescriptor = vd;
        descriptor.vertexFunction = functionVertex;
        descriptor.fragmentFunction = functionFragment;
        descriptor.colorAttachments[0].pixelFormat = MTLPixelFormatRGBA8Unorm;
        
        // Create a pipeline, only interested in the reflection information
        id  renderPS = [r->getMetalDevice()
                                                newRenderPipelineStateWithDescriptor:descriptor
                                                options:MTLPipelineOptionArgumentInfo|MTLPipelineOptionBufferTypeInfo
                                                reflection:&reflection
                                                error:&error];


        if ( error != nil )
        {
            zDbgLogInternal("ERROR: Shader Reflection on [" + getName() + "]" );
            NSLog(@"ERROR: %@", [error localizedDescription] );
            return;
        }
        
        for (MTLArgument *arg in reflection.vertexArguments)
        {
            processUniform(arg,0);
        }


        for (MTLArgument *arg in reflection.fragmentArguments)
        {
            processUniform(arg,1);
        }
    }