how to use samplerExternalOES texture in fragment shader?

[zhaochunhe]

I have one external OES texture, and want to pass to fragment shader, then draw it. but the fragment shader file occur error when building. The code is following.

/////////////////////////////////////

$input v_texcoord0

/*

• Copyright 2011-2021 Branimir Karadzic. All rights reserved.
• License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
  */

#include "/usr/local/include/bgfx/bgfx_shader.sh"

SAMPLEREXTERNALOES(s_texColor, 0);

void main()
{

   gl_FragColor= texture2D(s_texColor, v_texcoord0.xy);

}