o3de-azslc/tests/Advanced/srg-strip-unused-none-fallback.azsl

// This file is used to validate the functionality of the --strip-unused-srgs flag.
// There are three SRGs in this file: SRG1, SRG2 and SRG3.
// Nothing references SRG3, but SRG3 contains the fallback key and it should not be removed.
// In the end no SRG should be stripped.

ShaderResourceGroupSemantic slot1
{
    FrequencyId = 1;
};

ShaderResourceGroupSemantic slot2
{
    FrequencyId = 2;
};

ShaderResourceGroupSemantic slot3
{
    FrequencyId = 3;
    ShaderVariantFallback = 128;
};

//Referenced by MainPS
ShaderResourceGroup SRG1 : slot1
{
    struct CB
    {
        float4 color;
    };

    ConstantBuffer<CB> m_uniforms;
};

// Referenced by SRG3. If SRG3 is stripped then this can be stripped too.
ShaderResourceGroup SRG2 : slot2
{
    struct MB
    {
        float4 position;
    };

    ConstantBuffer<MB> m_uniforms;
    MB m_other;
};

// Unused, but references SRG2 and it is the chosen fallback.
// Should not be removed when --strip-unused-srgs is used.
ShaderResourceGroup SRG3 : slot3
{
    ConstantBuffer<SRG2::MB> m_mycbs; ConstantBuffer<SRG1::CB> m_srgcb; SRG2::MB m_mbr;
    float4          m_uniformColor;
    Texture2D       m_texture;
    Buffer<float>   m_buffer;
    Sampler m_dynamicSampler;
    Sampler m_staticSampler
    {
        AddressU = Wrap;
        AddressV = Wrap;
        AddressW = Wrap;
        MagFilter = Linear;
    };
    
    row_major float3x4 m_modelToWorld;
    row_major float3x3 m_normalMatrix;
 
    float4x4 GetWorldMatrix()
    {
        float4x4 modelToWorld = float4x4(
            float4(1, 0, 0, 0),
            float4(0, 1, 0, 0),
            float4(0, 0, 1, 0),
            float4(0, 0, 0, 1));
 
        modelToWorld[0] = m_modelToWorld[0];
        modelToWorld[1] = m_modelToWorld[1];
        modelToWorld[2] = m_modelToWorld[2];
        return modelToWorld;
    }
     
    float3x3 GetNormalMatrix()
    {
        return m_normalMatrix;
    }
};

float4 MainPS(float2 uv) : SV_Target0
{
    return SRG1::m_uniforms.color;
}