cocos-creator-template/assets/chunks/shading-entries/main-functions/render-to-shadowmap/fs.chunk

in highp vec2 v_clip_depth;

layout(location = 0) out vec4 fragColorX;

void main () {
  // better performance than SurfacesFragmentModifyBaseColorAndTransparency
#ifdef CC_SURFACES_FRAGMENT_ALPHA_CLIP_ONLY
  SurfacesFragmentAlphaClipOnly();
#endif

  highp float clipDepth = v_clip_depth.x / v_clip_depth.y * 0.5 + 0.5;
  // spot use linear
  #if CC_SHADOWMAP_USE_LINEAR_DEPTH
    if (IS_SPOT_LIGHT(cc_shadowLPNNInfo.x)) {
      clipDepth = CCGetLinearDepth(FSInput_worldPos.xyz);
    }
  #endif

  #if CC_SHADOWMAP_FORMAT == SHADOWMAP_FORMAT_RGBA8
    fragColorX = packDepthToRGBA(clipDepth);
  #else
    fragColorX = vec4(clipDepth, 1.0, 1.0, 1.0);
  #endif
}