Unity Shader 自分用テンプレート

本記事は、Unityで自分が使うときの最低構成のシェーダーをまとめたものです。

Unlit.shader

Shader "Custom/Unlit"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
    }
    SubShader
    {
        Tags {
            "RenderType"="Opaque"
            "RenderPipeline"="UniversalPipeline"
        }
        LOD 100

        Pass
        {
            Name "ForwardLit"
            Tags { "LightMode"="UniversalForward" }

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
  
            #pragma multi_compile_fog

            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

            struct in_vert
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct in_frag
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            TEXTURE2D(_MainTex);
            SAMPLER(sampler_MainTex);

            CBUFFER_START(UnityPerMaterial)
            float4 _MainTex_ST;
            CBUFFER_END
            in_frag vert (in_vert v)
            {
                in_frag o;
                o.vertex = TransformObjectToHClip(v.vertex.xyz);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }

            float4 frag (in_frag i) : SV_Target
            {
                float4 color = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv);
                return color;
            }
            ENDHLSL
        }
    }
}

lit.shader

Shader "Custom/lit"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
    }
    SubShader
    {
        Tags {
            "RenderType"="Opaque"
            "RenderPipeline"="UniversalPipeline"
        }
        LOD 100

        Pass
        {
            Name "ForwardLit"
            Tags { "LightMode"="UniversalForward" }

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
  
            #pragma multi_compile_fog

            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
			#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
			#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"

            struct in_vert
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
				float3 normal_o : NORMAL;
            };

            struct in_frag
            {
				float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
				float3 pos_w : TEXCOORD1;
				float3 normal_w : TEXCOORD2;
            };

            TEXTURE2D(_MainTex);
            SAMPLER(sampler_MainTex);

            CBUFFER_START(UnityPerMaterial)
            float4 _MainTex_ST;
            CBUFFER_END
			float3 MainLightDir(float3 w_pos)
			{
				float4 shadowCoord = TransformWorldToShadowCoord(w_pos);
				Light mainLight = GetMainLight(shadowCoord);
				return mainLight.direction;
			}
			Light MainLight(float3 w_pos)
			{
				float4 shadowCoord = TransformWorldToShadowCoord(w_pos);
				Light mainLight = GetMainLight(shadowCoord);
				return mainLight;
			}
            in_frag vert (in_vert v)
            {
                in_frag o;
                o.vertex = TransformObjectToHClip(v.vertex.xyz);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				o.pos_w = TransformObjectToWorld(v.vertex.xyz);
				o.normal_w = TransformObjectToWorldNormal(v.normal_o);
                return o;
            }

            float4 frag (in_frag i) : SV_Target
            {	
				Light mainLight = MainLight(i.pos_w);
				float L = mainLight.direction;
				float N = i.normal_w;

				float NdotL = dot(N,L);
                float4 color = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv);
				color.rgb = NdotL;
                return color;
            }
            ENDHLSL
        }
    }
}