#if !(defined(VFX_VARYING_PS_INPUTS) && defined(VFX_VARYING_POSCS))
#error VFX_VARYING_PS_INPUTS, VFX_VARYING_POSCS and VFX_VARYING_UV must be defined.
#endif

${VFXPerPassInclude}
${VFXGeneratedBlockFunction}

${VFXInclude("Shaders/ParticlePlanarPrimitives/PassVS.template"),!USE_GEOMETRY_SHADER}
${VFXInclude("Shaders/ParticlePlanarPrimitives/PassGS.template"),USE_GEOMETRY_SHADER}

${VFXBegin:VFXComputeNormalWS}
#ifdef VFX_VARYING_NORMAL
#if USE_DOUBLE_SIDED
const float faceMul = frontFace ? 1.0f : -1.0f;
#else
const float faceMul = 1.0f;
#endif
	
float3 normalWS = i.VFX_VARYING_NORMAL * faceMul;
const VFXUVData uvData = GetUVData(i);

#ifdef VFX_VARYING_TANGENT
float3 tangentWS = i.VFX_VARYING_TANGENT;
float3 bitangentWS = cross(i.VFX_VARYING_TANGENT,i.VFX_VARYING_NORMAL);

#if defined(VFX_VARYING_BENTFACTORS) && USE_NORMAL_BENDING	
float3 bentFactors = float3(i.VFX_VARYING_BENTFACTORS.xy,sqrt(max(0.0f,1.0f - dot(i.VFX_VARYING_BENTFACTORS,i.VFX_VARYING_BENTFACTORS))));
normalWS = tangentWS * bentFactors.x + bitangentWS * bentFactors.y + normalWS * bentFactors.z;
tangentWS = normalize(cross(normalWS,bitangentWS));
bitangentWS = cross(tangentWS,normalWS);
tangentWS *= faceMul;
#endif

float3x3 tbn = float3x3(tangentWS,bitangentWS,normalWS);

#if USE_NORMAL_MAP
float3 n = SampleNormalMap(VFX_SAMPLER(normalMap),uvData);
float normalScale = 1.0f;
#ifdef VFX_VARYING_NORMALSCALE
normalScale = i.VFX_VARYING_NORMALSCALE;
#endif
normalWS = normalize(lerp(normalWS,mul(n,tbn),normalScale));
#endif
#endif
#endif
${VFXEnd}

${VFXFragmentCommonFunctions}

${VFXBegin:VFXVertexAdditionalProcess}${VFXEnd}