如下代码在编译fragment shader时候会提示编译错误
vertex shader
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Fragment shader
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varying vec4 v_color; \n attribute vec3 v_Position; \n attribute vec4 f_Color; \n void main(void) \n { \n gl_Position = vec4(v_Position, 1.0); \n v_color = f_Color; \n }"
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varying vec4 v_color; \n void main(void) \n { \n gl_FragColor = v_color; \n };
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在fragment shader中加入精度控制，就不会出现编译错误！任何一个精度控制都可以解决编译错误（不解！）
vertex shader |
Fragment shader |
varying vec4 v_color; \n attribute vec3 v_Position; \n attribute vec4 f_Color; \n void main(void) \n { \n gl_Position = vec4(v_Position, 1.0); \n v_color = f_Color; \n }"
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varying (lowp/mediump/highp) vec4 v_color; \n void main(void) \n { \n gl_FragColor = v_color; \n };
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http://blog.chinaunix.net/uid-12348673-id-3441087.html
GLES & Shader Language 易错集锦,布布扣,bubuko.com
原文：http://www.cnblogs.com/yaozhongxiao/p/3920943.html