/*
 * 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>

struct VertexInput
{
    float2 Position : POSITION;
    float2 UV : UV;
    float4 Color : COLOR;
};

struct VertexOutput
{
    float4 Position : SV_Position;
    float4 Color : COLOR;
    float2 UV : UV;
};

ShaderResourceGroup ObjectSrg : SRG_PerObject
{
    Texture2D<float4> FontImage;
    
    Sampler LinearSampler
    {
        MinFilter = Linear;
        MagFilter = Linear;
        MipFilter = Linear;
        AddressU = Clamp;
        AddressV = Clamp;
        AddressW = Clamp;
    };
    
    column_major float4x4 m_projectionMatrix;
}

VertexOutput MainVS(in VertexInput input)
{
    VertexOutput output;
    output.Position = mul(float4(input.Position, 0.0f, 1.0f), ObjectSrg::m_projectionMatrix);
    output.Color = float4(input.Color.rgb, input.Color.a);
    output.UV = input.UV;
    return output;
}

struct PixelOutput
{
     float4 m_color : SV_Target0;
};  
    
PixelOutput MainPS(in VertexOutput input)
{
    PixelOutput output;
    float4 color = ObjectSrg::FontImage.Sample(ObjectSrg::LinearSampler, input.UV) * input.Color;
    output.m_color = float4(color.rgb * color.a, color.a);
    return output;
}