o3de-azslc/tests/Advanced/srg-layouts-structs.azsl

ShaderResourceGroupSemantic ExampleBinding { FrequencyId = 0; };

ShaderResourceGroup ExampleSRG : ExampleBinding
{
    struct Sab  {
        float   a;  // Offset  0
        float2  b;  // Offset  4
    };
    
    struct Sba  {
        float2  b;  // Offset  0
        float   a;  // Offset  8
    };
    
    struct Sabc {
        float   a;  // Offset  0
        float2  b;  // Offset  4
        float3  c;  // Offset 16
    };
    
    struct Sac {
        float   a;  // Offset  0
        float3  c;  // Offset  4
    };
    
    struct S {
        float  a;  // Offset  0
        float4 b;  // Offset 16
    };

	struct U {
		int32_t  a; // Offset 0
		int64_t  b; // Offset 4
		uint32_t c; // Offset 12
		uint64_t d; // Offset 16
	};
    
    // Note! dxc's SpirV generation has the following error:
    // fatal error: generated SPIR-V is invalid: Structure id 5 decorated as BufferBlock for variable 
    // in Uniform storage class must follow relaxed storage buffer layout rules: 
    // member 1 is an improperly straddling vector at offset 12
    
    struct T {
        // Dxc bug (below):
        // Having a float before the Sab struct below causes a layouting error in StructuredBuffer-s
        // float    b;  
        Sab      ab;           // Offset   0
        Sba      ba;           // Offset  16 (+16)
        Sabc     abc;          // Offset  32 (+16)
        Sac      ac;           // Offset  64 (+32)
        S        s;            // Offset  80 (+16)
        float    a_float;      // Offset 112 (+32)
		U        u;            // Offset 116/128 (+4/16)
    };

    T m_CB;

    StructuredBuffer<T> m_SB;
};