cocos-creator-template/assets/chunks/surfaces/default-functions/common-vs.chunk

#ifndef CC_SURFACES_VERTEX_MODIFY_LOCAL_POS
// depends on CC_SURFACES_VERTEX_MODIFY_LOCAL_POS
vec3 SurfacesVertexModifyLocalPos(in SurfacesStandardVertexIntermediate In)
{
  // compatible issue: crash with vulkan + MI6
  return vec3(In.position.xyz);
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_LOCAL_NORMAL
// depends on CC_SURFACES_VERTEX_MODIFY_LOCAL_NORMAL
vec3 SurfacesVertexModifyLocalNormal(in SurfacesStandardVertexIntermediate In)
{
  return In.normal.xyz;
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_LOCAL_TANGENT
  #if CC_SURFACES_USE_TANGENT_SPACE
// depends on CC_SURFACES_VERTEX_MODIFY_LOCAL_TANGENT
  vec4 SurfacesVertexModifyLocalTangent(in SurfacesStandardVertexIntermediate In)
    {
      return In.tangent;
    }
  #endif
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_LOCAL_SHARED_DATA
// depends on CC_SURFACES_VERTEX_MODIFY_LOCAL_SHARED_DATA
// some vertex datas use shared raw data, avoid sample / calculate same raw data multiply times, use this function for better performance
// this function invokes before world transform
void SurfacesVertexModifyLocalSharedData(inout SurfacesStandardVertexIntermediate In)
{
}
#endif


#ifndef CC_SURFACES_VERTEX_MODIFY_WORLD_POS
// depends on CC_SURFACES_VERTEX_MODIFY_WORLD_POS
vec3 SurfacesVertexModifyWorldPos(in SurfacesStandardVertexIntermediate In)
{
  return In.worldPos;
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_CLIP_POS
// depends on CC_SURFACES_VERTEX_MODIFY_CLIP_POS
vec4 SurfacesVertexModifyClipPos(in SurfacesStandardVertexIntermediate In)
{
  return In.clipPos;
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_UV
// depends on CC_SURFACES_VERTEX_MODIFY_UV
void SurfacesVertexModifyUV(inout SurfacesStandardVertexIntermediate In)
{
//   In.texCoord = In.texCoord;
// #if CC_SURFACES_USE_SECOND_UV
//   In.texCoord1 = In.texCoord1;
// #endif
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_WORLD_NORMAL
// depends on CC_SURFACES_VERTEX_MODIFY_WORLD_NORMAL
vec3 SurfacesVertexModifyWorldNormal(in SurfacesStandardVertexIntermediate In)
{
    vec3 worldNormal = In.worldNormal.xyz;
  #if CC_SURFACES_USE_TWO_SIDED
      worldNormal.xyz *= In.worldNormal.w;
  #endif
  return worldNormal;
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_SHADOW_BIAS
// depends on CC_SURFACES_VERTEX_MODIFY_SHADOW_BIAS
// shadow bias for submesh-level
vec2 SurfacesVertexModifyShadowBias(in SurfacesStandardVertexIntermediate In, vec2 originShadowBias)
{
  return originShadowBias;
}
#endif

#ifndef CC_SURFACES_VERTEX_MODIFY_SHARED_DATA
// depends on CC_SURFACES_VERTEX_MODIFY_SHARED_DATA
// some vertex datas use shared raw data, avoid sample / calculate same raw data multiply times, use this function for better performance
// this function invokes at last
void SurfacesVertexModifySharedData(inout SurfacesStandardVertexIntermediate In)
{
}
#endif