WebGL:getUniformLocation在Safari上失败

Uniform A not found

这段代码在Chrome/MacOS和Windows的所有浏览器上运行都没有问题。

precision highp float;
precision highp int;
varying vec2 TexCoords;

uniform sampler2D A;

float indentity_(float a) {
  return a;
}
vec4 indentity_(vec4 v) {
  return v;
}

void main() {
  vec4 v = texture2D(A, TexCoords);
  v = indentity_(v);
  gl_FragColor = v;
}

这是Safari版本:

Safari 12.0.1 (Mac OS X 10.14.1)

谢谢