Shader "Builtin Unlit"
{
    Properties
    {
        _BaseColor ("Base Color", Color) = (1,1,1,1) [Semantic(BaseColor)]
        _MainTex ("Base Map", 2D) = "white" [Semantic(BaseColorTexture)]
    }
    SubShader
    {
        Pass
        {
            Name "Unlit"
            Tags { "LightMode" = "Unlit" }
            Cull Back
            ZWrite On
            ZTest LEqual
            HLSLPROGRAM
            #pragma target 4.5
            #pragma vertex MainVS
            #pragma fragment MainPS
            cbuffer PerObjectConstants
            {
                float4x4 gProjectionMatrix;
                float4x4 gViewMatrix;
                float4x4 gModelMatrix;
                float4x4 gNormalMatrix;
            };

            cbuffer MaterialConstants
            {
                float4 gBaseColorFactor;
            };

            Texture2D BaseColorTexture;
            SamplerState LinearClampSampler;

            struct VSInput
            {
                float3 position : POSITION;
                float3 normal : NORMAL;
                float2 texcoord : TEXCOORD0;
            };

            struct PSInput
            {
                float4 position : SV_POSITION;
                float2 texcoord : TEXCOORD0;
            };

            PSInput MainVS(VSInput input)
            {
                PSInput output;
                const float4 positionWS = mul(gModelMatrix, float4(input.position, 1.0f));
                const float4 positionVS = mul(gViewMatrix, positionWS);
                output.position = mul(gProjectionMatrix, positionVS);
                output.texcoord = input.texcoord;
                return output;
            }

            float4 MainPS(PSInput input) : SV_TARGET
            {
                return BaseColorTexture.Sample(LinearClampSampler, input.texcoord) * gBaseColorFactor;
            }
            ENDHLSL
        }
    }
}