opengl - Sampling unsigned integer texture data in a shader -


I want to render an unsigned integer texture with a piece shider using the following code: 

  glTexImage2D (GL_TEXTURE_2D, 0, GL_R8UI, width, height, 0, GL_RED_INTEGER, GL_UNSIGNED_BYTE, data);   
 and part of the piece sha ader code:  
  # version 330 Uniform UEmpler 2D Tech; Zero main (zero) {vec3 vec_tex; Vec_tex = (textx (tex), TexCoordOut) .r}   
 It is written in   OpenGL programming guide  , if I want to To get an integer in Shader, then I should use an integer sample type, an integer internal format, and an integer external format and type. As the external type, the form of data as  GL_UNSIGNED_BYTE , we are the internal code,  GL_RED_INTEGER  as  GL_R8UI  I am in shader  usampler2d , but when the file file begins to render, there is always a mistake of error for   "int" to "uint"   . It seems that texture data is stored as int, and unsigned samples can not change it. But I used the  GL_R8UI  as the internal code, so textual data should be stored as unsigned. Why unsigned samples are only signed signatures? How do I solve this problem? Texture function call is not correct; Second, the value that is in shader by 255.0 (as you can see in GL_R8UI Need to be divided) by dividing the RGBA components and controlling the return and slice color output.  
  Uniform UEmpler 2D Tech; Outside the uvecy3outer; Zero main (zero) {uvec3 vec_tex; Vec_tex = Texture (Texcos, TexcoreAut) Output = VC3 (Float (Week_tex. R) / 255, Float (Week_tex. G) / 255, Float (Week_tex.b) / 255)}   / div>

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