OpenGLES Shader Precision

OpenGL ES 如何获取 shader precision 着色器的精度值 GetShaderPrecisionFormat 

int range, precision;
glGetShaderPrecisionFormat(GL_FRAGMENT_SHADER, GL_HIGH_FLOAT, &range, &precision);

From the OpenGL ES Shading Language reference:

openGL ES 精度范围

• highp - 16-bit, floating point range: -2^62 to 2^62, integer range: -2^16 to 2^16
• mediump - 10 bit, floating point range: -2^14 to 2^14, integer range: -2^10 to 2^10
• lowp - 8 bit, floating point range: -2 to 2, integer range: -2^8 to 2^8

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