o3de-atom-sampleviewer/Shaders/RHI/DualSourceBlending.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 DualSourceBlendingSrg : SRG_PerObject
{
    float m_blendFactor;
}

struct VSInput
{
    float3 m_position : POSITION;
    float4 m_color : COLOR;
};

struct VSOutput
{
    float4 m_position : SV_Position;
    float4 m_color : COLOR;
};
  
VSOutput MainVS(VSInput vsInput)
{
    VSOutput OUT;
    OUT.m_position = float4(vsInput.m_position, 1.0);
    OUT.m_color = vsInput.m_color;
    return OUT;
}

struct PSOutput
{
    [[vk::location(0), vk::index(0)]]
    float4 m_color0 : SV_Target0;
    [[vk::location(0), vk::index(1)]]
    float4 m_color1 : SV_Target1;
};

PSOutput MainPS(VSOutput psInput)
{
    PSOutput OUT;
    OUT.m_color0 = psInput.m_color;
    OUT.m_color1 = float4(DualSourceBlendingSrg::m_blendFactor, DualSourceBlendingSrg::m_blendFactor, DualSourceBlendingSrg::m_blendFactor, 1.0);

    // Set in BlendState
    // FinalColor = SourceColor * SourceColor1 + DestColor * (1 - SourceColor1)
    return OUT;
}