// Forward pass
Pass
{		
	Tags { "LightMode"=${VFXPassForward} }
	
	${VFXStencilForward}

	HLSLPROGRAM
	#pragma target 4.5
	
	struct ps_input
	{
		float4 pos : SV_POSITION;

		#if VFX_NEEDS_COLOR_INTERPOLATOR
		nointerpolation float4 color : COLOR0;
		#endif
		#if USE_SOFT_PARTICLE || USE_ALPHA_TEST || USE_EXPOSURE_WEIGHT
		// x: inverse soft particles fade distance
		// y: alpha threshold
		// z: exposure weight
		nointerpolation float3 builtInInterpolants : TEXCOORD1;
		#endif
		
		#if VFX_USE_RIM_LIGHT
		float3 offsets : TEXCOORD0;
		nointerpolation float3 rotX : TEXCOORD2;
		nointerpolation float3 rotY : TEXCOORD3;
		float3 posWS : TEXCOORD5;
		nointerpolation float4 rimSettings : COLOR1;
		#if VFX_USE_NORMAL_MAP
		nointerpolation uint faceID : TEXCOORD4;
		#endif
		#endif

        UNITY_VERTEX_OUTPUT_STEREO
	};
	
	struct ps_output
	{
		float4 color : SV_Target0;
	};

#define VFX_VARYING_PS_INPUTS ps_input
#define VFX_VARYING_POSCS pos
#define VFX_VARYING_COLOR color.rgb
#define VFX_VARYING_ALPHA color.a
#define VFX_VARYING_INVSOFTPARTICLEFADEDISTANCE builtInInterpolants.x
#define VFX_VARYING_ALPHATHRESHOLD builtInInterpolants.y
#if USE_EXPOSURE_WEIGHT
#define VFX_VARYING_EXPOSUREWEIGHT builtInInterpolants.z
#endif

#if VFX_USE_RIM_LIGHT
#define VFX_VARYING_OFFSETS offsets
#define VFX_VARYING_ROTX rotX
#define VFX_VARYING_ROTY rotY
#define VFX_VARYING_POSWS posWS
#if VFX_USE_NORMAL_MAP
#define VFX_VARYING_FACEID faceID
#endif
#endif
				
	${VFXBegin:VFXVertexAdditionalProcess}
#if VFX_USE_RIM_LIGHT
	${VFXLoadParameter:{rimColor}}
	${VFXLoadParameter:{rimCoef}}
	rimCoef = saturate(1.0f - rimCoef);
	o.rimSettings = float4(rimColor.rgb,rimCoef);
#endif
	${VFXEnd}

	${VFXPassForwardDefine}
	${VFXInclude("Shaders/ParticleHexahedron/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);
		
		o.color = VFXGetFragmentColor(i);
		
#if VFX_USE_RIM_LIGHT
		float3 normal = VFXCubeGetLocalNormal(i);	
#if VFX_USE_NORMAL_MAP
		float3 n = VFXGetTextureNormal(VFX_SAMPLER(normalMap),VFXCubeGetUV(i));
		normal = VFXCubeTransformNormalTS(normal,n);
#endif
		normal = VFXCubeTransformNormalWS(i,normal);
		
		const float r0 = i.rimSettings.a;
		float3 posToCam = normalize(VFXGetViewWorldPosition() - i.posWS);
		const float3 fresnel = r0 + (1.0f - r0) * pow(1.0f - saturate(dot(normal,posToCam)),5.0f);
		o.color.rgb += saturate(fresnel) * i.rimSettings.rgb;
#endif
		
        o.color = VFXApplyPreExposure(o.color, i);
		o.color = VFXApplyFog(o.color,i);
		VFXClipFragmentColor(o.color.a,i);
		o.color.a = saturate(o.color.a);
        o.color = VFXTransformFinalColor(o.color);
		return o;
	}
	ENDHLSL
}