shader error

[JianJD]

当我用选择工具选择构件时，shader报错了 When I used the selection tool to select components, the shader reported an error

xeokit-bim-viewer.min.es.js:1 Fragment shader failed to compile

ERROR: 0:12: 'varying' : Illegal use of reserved word

1: #version 300 es 2: // Triangles dataTexture draw fragment shader 3: #ifdef GL_FRAGMENT_PRECISION_HIGH 4: precision highp float; 5: precision highp int; 6: #else 7: precision mediump float; 8: precision mediump int; 9: #endif 10: in float isPerspective; 11: uniform float logDepthBufFC; 12: varying float vFragDepth; 13: uniform vec4 color; 14: out vec4 outColor; 15: void main(void) { 16: gl_FragDepth = log2( vFragDepth ) * logDepthBufFC * 0.5; 17: outColor = color; 18: }