o3de-atom-sampleviewer/Shaders/PostProcessing/Monochrome.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>

#include <Atom/Features/PostProcessing/FullscreenPixelInfo.azsli>
#include <Atom/Features/PostProcessing/FullscreenVertex.azsli>
#include <Atom/Features/PostProcessing/PostProcessUtil.azsli>

ShaderResourceGroup PassSrg : SRG_PerPass
{
    Texture2D<float4> m_framebuffer;
    Sampler LinearSampler
    {
        MinFilter = Linear;
        MagFilter = Linear;
        MipFilter = Linear;
        AddressU = Clamp;
        AddressV = Clamp;
        AddressW = Clamp;
    };
    
    float4 m_colorTint;
}

PSOutput MainPS(VSOutput IN)
{
    PSOutput OUT;

    float3 color = PassSrg::m_framebuffer.Sample(PassSrg::LinearSampler, IN.m_texCoord).rgb;

    float average = color.r + color.g + color.b;
    average /= 3.0f;

    OUT.m_color.rgb = float3(average, average, average);
    OUT.m_color.w = 1;

    OUT.m_color.rgb *= PassSrg::m_colorTint.rgb;

    return OUT;
}