RaymarchHDRP.shader

Shader "Raymarch/RaymarchHDRP"
{

    SubShader
    {
        Cull Off ZWrite Off ZTest Always

        Pass
        {
            HLSLPROGRAM

			#pragma target 3.5

            #pragma vertex vert
			#pragma fragment frag

			#include "Packages/com.unity.postprocessing/PostProcessing/Shaders/StdLib.hlsl"

			TEXTURE2D_SAMPLER2D(_MainTex, sampler_MainTex);
			half4 _MainTex_ST;
			uniform float4 _CamWorldSpace;
			uniform float4x4 _CamFrustum,  _CamToWorld;

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

			struct v2f
			{
				float4 vertex : SV_POSITION;
				float2 texcoord : TEXCOORD0;
				float2 texcoordStereo : TEXCOORD1;
				float3 ray : TEXCOORD2;
			};

			v2f vert(AttributesDefault v)
			{
				v2f o;
				o.vertex = float4(v.vertex.xy, 0.0, 1.0);
				o.texcoord = TransformTriangleVertexToUV(v.vertex.xy);

				#if UNITY_UV_STARTS_AT_TOP
					o.texcoord = o.texcoord * float2(1.0, -1.0) + float2(0.0, 1.0);
				#endif

				o.texcoordStereo = TransformStereoScreenSpaceTex(o.texcoord, 1.0);

				half index = v.vertex.z;
				v.vertex.z = 0;
				o.vertex = mul(unity_MatrixVP, v.vertex);

				o.ray = _CamFrustum[(int)index].xyz;
				o.ray /= abs(o.ray.z);
				o.ray = mul(_CamToWorld, o.ray);

				return o;
			}

			float4 frag(v2f i) : SV_Target
			{
				float3 rayDirection = normalize(i.ray.xyz);
				float3 rayOrigin = _CamWorldSpace;
				return float4(rayDirection, 1);
			}

            ENDHLSL
        }
    }
}