cocos-creator-template/assets/chunks/shading-entries/data-structures/vs-input.chunk

//IA Input
layout(location = 0) in vec3 a_position;
layout(location = 1) in vec3 a_normal;
layout(location = 2) in vec2 a_texCoord;
#if CC_SURFACES_USE_TANGENT_SPACE
  layout(location = 3) in vec4 a_tangent;
#endif

#if CC_SURFACES_USE_VERTEX_COLOR
  in vec4 a_color;
#endif

// Attribute define should depend on system macro, not surface macro
#if CC_SURFACES_USE_SECOND_UV || CC_USE_LIGHTMAP
  in vec2 a_texCoord1;
#endif

#if CC_USE_SKINNING
  #if __VERSION__ > 310
    // strictly speaking this should be u16vec4, but due to poor driver support
    // somehow it seems we can get better results on many platforms using u32vec4
    layout(location = 4) in u32vec4 a_joints;
  #else
    #pragma format(RGBA16UI)
    layout(location = 4) in vec4 a_joints;
  #endif

  layout(location = 5) in vec4 a_weights;
#endif

#if USE_INSTANCING
  #if CC_USE_BAKED_ANIMATION
    in highp vec4 a_jointAnimInfo; // frameID, totalJoints, offset
  #endif
  in vec4 a_matWorld0;
  in vec4 a_matWorld1;
  in vec4 a_matWorld2;
  #if CC_USE_LIGHTMAP
    in vec4 a_lightingMapUVParam;
  #endif
  #if CC_RECEIVE_SHADOW || CC_USE_REFLECTION_PROBE
    in vec4 a_localShadowBiasAndProbeId; // x:shadow bias, y:shadow normal bias, z: reflection probe id, w: blend reflection probe id
  #endif
  #if CC_USE_REFLECTION_PROBE
    in vec4 a_reflectionProbeData; // x:reflection probe blend weight
  #endif
  #if CC_USE_LIGHT_PROBE
    in vec4 a_sh_linear_const_r;
    in vec4 a_sh_linear_const_g;
    in vec4 a_sh_linear_const_b;
  #endif
#endif

#if CC_USE_MORPH
  #if __VERSION__ < 450
    in float a_vertexId;
  #endif
#endif