o3de-azslc/tests/Emission/gmem-depth-vk.azsl

ShaderResourceGroupSemantic slot1
{
    FrequencyId = 1;
};

/* tester */
ShaderResourceGroup SRG : slot1
{
    struct CB
    {
        float4 color;
    };
    ConstantBuffer<CB> m_uniforms;

    [[input_attachment_index(0)]]
    SubpassInputDS<float4> m_sub;

    float4x4 projection;
};

float4 ReadSourceFromTile(SubpassInputDS spi)
{
    return spi.SubpassLoad(int3(0,0,0));
}

// vertex
float4 MainVS(float4 position : POSITION0) : POSITION0
{
    return mul(SRG::projection, position );
}

// pixel
float4 MainPS(float2 uv : TEXCOORD0) : SV_Target0
{
    // SubpassInput si = SRG::m_sub;
    return SRG::m_uniforms.color + ReadSourceFromTile(SRG::m_sub);
}