{
	parms {
		stageSort	sortPerturber
	}
	state {
		depthMask
		depthfunc	GL_LEQUAL
		blend		GL_ONE_MINUS_DST_ALPHA GL_DST_ALPHA
	}
	hlsl_vp {
		result.position.x = dot4( vertex.position, $mvpMatrixX );
		result.position.y = dot4( vertex.position, $mvpMatrixY );
		result.position.z = dot4( vertex.position, $mvpMatrixZ );
		result.position.w = dot4( vertex.position, $mvpMatrixW );

		float4 worldPosition;
		worldPosition.x = dot4( vertex.position, $modelMatrixX );
		worldPosition.y = dot4( vertex.position, $modelMatrixY );
		worldPosition.z = dot4( vertex.position, $modelMatrixZ );
		worldPosition.w = dot4( vertex.position, $modelMatrixW );
		
		float eyeDistance = abs( dot4( worldPosition, $viewMatrixZ ) );
		float nearFade = saturate( ( eyeDistance - $distortionFade.x ) / ( $distortionFade.y - $distortionFade.x ) );
		float farFade = saturate( ( eyeDistance - $distortionFade.z ) / ( $distortionFade.w - $distortionFade.z ) );
		float fade = nearFade * ( 1.0 - farFade );
		
		result.texcoord0.x = dot4( vertex.texcoord0, $sMatrix );
		result.texcoord0.y = dot4( vertex.texcoord0, $tMatrix );
		result.texcoord0.z = fade;
		result.texcoord0.w = -( clamp( result.position.w - $fogStart.x, 0.0, $fogEnd.x ) * $fogScale.x );

		float4 color = swizzleColor( vertex.color ) * $color;

		result.color = color;
	}
	hlsl_fp {
		// Sample normal map
		float4 texel = tex2D( $distortionMap, fragment.texcoord0.xy );
		
		float blur = texel.z * fragment.color.w * fragment.texcoord0.z;
		float mask = texel.w * fragment.color.w * fragment.texcoord0.z;

		// Convert from [0,1] to [-1,1]
		float2  distortion = ( texel.xy * _float2( 2.0 ) ) - _float2( 1.0 );

		// Scale normals by globals multiplied with color
		distortion *= $distortionScale.xy * fragment.color.xy * _float2( mask );
		
		// Compute and store distortion normals
		result.color = ComputeDistortion( distortion, blur );
	}
}