o3de-atom-sampleviewer/Shaders/RHI/MRTScreen.azsl

/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#include <Atom/Features/SrgSemantics.azsli>

ShaderResourceGroup MrtScreenInstanceSrg : SRG_PerObject
{
    Texture2D rMap;
    Texture2D gMap;
    Texture2D bMap;

    Sampler m_sampler
    {
        MaxAnisotropy = 16;
        AddressU = Wrap;
        AddressV = Wrap;
        AddressW = Wrap;
    };
}

struct VSInput
{
    float3 m_position : POSITION;
    float2 m_uv : UV0;
};

struct VSOutput
{
    float4 m_position : SV_Position;
    float2 m_uv : UV0;
};

VSOutput MainVS(VSInput vsInput)
{
    VSOutput OUT;
    OUT.m_position = float4(vsInput.m_position, 1.0);
    OUT.m_uv = vsInput.m_uv;
    return OUT;
}

struct PSOutput
{
    float4 m_color : SV_Target0;
};

PSOutput MainPS(VSOutput psInput)
{
    PSOutput OUT;
    float red   = MrtScreenInstanceSrg::rMap.Sample(MrtScreenInstanceSrg::m_sampler, psInput.m_uv).x;
    float green = MrtScreenInstanceSrg::gMap.Sample(MrtScreenInstanceSrg::m_sampler, psInput.m_uv).x;
    float blue  = MrtScreenInstanceSrg::bMap.Sample(MrtScreenInstanceSrg::m_sampler, psInput.m_uv).x;
    OUT.m_color = float4(red, green, blue, 1);
    return OUT;
}