// Distortion pass
Pass
{
	Tags { "LightMode"="DistortionVectors" }

    ${VFXStencilDistortionVectors}

	HLSLPROGRAM
	#pragma target 4.5
	${VFXPassForwardAdditionalPragma}

	#define USE_NORMAL_MAP DISTORTION_NORMALBASED

	struct ps_input
	{
		float4 pos : SV_POSITION;
		#if USE_FLIPBOOK_INTERPOLATION
		float4 uv : TEXCOORD0;
		#else
			#if USE_FLIPBOOK_ARRAY_LAYOUT
			float3 uv : TEXCOORD0;
			#else
			float2 uv : TEXCOORD0;
			#endif
		#endif

		#if USE_SOFT_PARTICLE || VFX_USE_ALPHA_CURRENT || USE_FLIPBOOK_INTERPOLATION
		// x: inverse soft particles fade distance
		// y: alpha threshold
		// z: frame blending factor
		// w: alpha
		nointerpolation float4 builtInInterpolants : TEXCOORD1;
		#endif

		#if USE_FLIPBOOK_MOTIONVECTORS
		// x: motion vector scale u
		// y: motion vector scale v
		nointerpolation float2 builtInInterpolants2 : TEXCOORD2;
		#endif

		// x: horizontal value / normal scale
		// y: vertical value
		// z: blur scale
		nointerpolation float3 distortionInterpolants : TEXCOORD3;

		#if USE_SOFT_PARTICLE
		float4 projPos : TEXCOORD4;
		#endif

		#if DISTORTION_NORMALBASED
		float3 normal : TEXCOORD5;
		float4 tangent : TEXCOORD6;
		#endif

		UNITY_VERTEX_OUTPUT_STEREO

        VFX_VERTEX_OUTPUT_INSTANCE_INDEX
	};

	struct ps_output
	{
		float4 distortion : SV_Target0;
	};

	#define VFX_VARYING_PS_INPUTS ps_input
	#define VFX_VARYING_POSCS pos
	#define VFX_VARYING_POSSS projPos
	#define VFX_VARYING_INVSOFTPARTICLEFADEDISTANCE builtInInterpolants.x
	#define VFX_VARYING_ALPHATHRESHOLD builtInInterpolants.y
	#define VFX_VARYING_FRAMEBLEND builtInInterpolants.z
	#define VFX_VARYING_MOTIONVECTORSCALE builtInInterpolants2.xy
	#define VFX_VARYING_ALPHA builtInInterpolants.w
#if DISTORTION_NORMALBASED
	#define VFX_VARYING_NORMAL normal
	#define VFX_VARYING_TANGENT tangent
#endif
	#define VFX_VARYING_UV uv

	${VFXIncludeRP("VFXDistortion.template")}

	${VFXBegin:VFXVertexAdditionalProcess}

	${VFXVertexDistortionProcess}

	${VFXEnd}

	${VFXInclude("Shaders/ParticleMeshes/Pass.template")}

	#pragma fragment frag
	ps_output frag(ps_input i)
	{
		UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
		ps_output o = (ps_output)0;
		VFXTransformPSInputs(i);

		${VFXFragmentDistortionProcess}
	}
	ENDHLSL
}