错误编号'1282`不是很描述。

glGetUniformLocation 的可能的错误代码是：

  GL_INVALID_VALUE 
 GL_INVALID_OPERATION 
 

其中没有固定值。尝试使用 gluErrorString（）获取错误字符串，或者查看 1282 地图的标题。

只是在黑暗中拍摄：

• 检查您的着色器是否已正确链接？

  / ul>
  
  

  BTW：返回类型是GLint不是GLuint

  
  
  

  着色器编译和链接没有错误 。

  
  
  

  根据规范（请参阅： http://www.opengl.org/sdk/docs/man/xhtml/glGetUniformLocation.xml ） GL_INVALID_OPERATION 只应在以下情况下生成：

  
  
  
  
  

  • 程式不是程式目标

  
  
  
  
  
  
  

  其他问题：

  
  
  
  
  

  • 您确定程序对象所属类的 getHandle（）方法返回权利ID。我的意思是在成功链接中使用的那个。

    
    
    

    你应该能够检查 glIsProgram（program-getHandle 返回 GL_TRUE

  
  
  
  
  

  strong> EDIT： Ah - 我错过了在您的示例中对 glUniform4fv 的调用。

  
  
  

  类型 glGetUniformLocation 仍然 GLint ，但我不认为这是问题。

  
  
  

  根据规范（请参阅： http：//www.opengl。 org / sdk / docs / man / xhtml / glUniform.xml ） GLUniformXX 产生 GL_INVALID_OPERATION 束原因。对我来说，可能似乎适用的唯一一个是：

  
  
  
  
  

  • 没有当前的程序对象

    
    
    

    在尝试调用 glUniform（）之前调用 glUseProgram（program-> getHandle（）） code>？

  
  
  
  

  I am trying to add lighting to my current scene of a simple cube. After setting up my uniforms I get a 1282 error from glGetError() for this piece of code

  GLuint ambientHandle = glGetUniformLocation(program->getHandle(), "ambientProduct");
  glUniform4fv( ambientHandle, 1, ambientProduct );
  GLuint diffuseHandle = glGetUniformLocation(program->getHandle(), "diffuseProduct");
  glUniform4fv( diffuseHandle, 1, diffuseProduct );
  GLuint specularHandle = glGetUniformLocation(program->getHandle(), "specularProduct");
  glUniform4fv( specularHandle, 1, specularProduct );
  GLuint lightPosHandle = glGetUniformLocation(program->getHandle(), "lightPosition");
  glUniform4fv( lightPosHandle, 1, light.position );
  GLuint shinyHandle = glGetUniformLocation(program->getHandle(), "shininess");
  glUniform1f( shinyHandle, materialShininess );
  

  Here are my shaders: vertex.glsl

  #version 120
  
  attribute vec4 coord3d;
  attribute vec3 normal3d;
  
  // output values that will be interpretated per-fragment
  varying  vec3 fN;
  varying  vec3 fE;
  varying  vec3 fL;
  
  uniform vec4 lightPosition;
  uniform mat4 mTransform;
  
  void main()
  {
      fN = normal3d;
      fE = coord3d.xyz;
      fL = lightPosition.xyz;
  
      if( lightPosition.w != 0.0 ) {
      fL = lightPosition.xyz - coord3d.xyz;
      }
  
      gl_Position = mTransform*coord3d;
  }
  

  fragment.glsl

  // per-fragment interpolated values from the vertex shader
  varying  vec3 fN;
  varying  vec3 fL;
  varying  vec3 fE;
  
  uniform vec4 ambientProduct, diffuseProduct, specularProduct;
  uniform mat4 mTransform;
  uniform vec4 lightPosition;
  uniform float shininess;
  
  void main() 
  { 
      // Normalize the input lighting vectors
      vec3 N = normalize(fN);
      vec3 E = normalize(fE);
      vec3 L = normalize(fL);
  
      vec3 H = normalize( L + E );
  
      vec4 ambient = ambientProduct;
  
      float Kd = max(dot(L, N), 0.0);
      vec4 diffuse = Kd*diffuseProduct;
  
      float Ks = pow(max(dot(N, H), 0.0), shininess);
      vec4 specular = Ks*specularProduct;
  
      // discard the specular highlight if the light's behind the vertex
      if( dot(L, N) < 0.0 ) {
      specular = vec4(0.0, 0.0, 0.0, 1.0);
      }
  
      gl_FragColor = ambient + diffuse + specular;
      gl_FragColor.a = 1.0;
  } 
  

  The products and position are each a struct of three GLfloats and shininess is a float. I have checked all of the values of the handles and the values I am passing and they all seem valid. Ideas?

  --EDIT: I have narrowed it to the glUniform4fv calls. It happens after each one. Also I have double checked that the program->getHandle() is pointing to something that looks valid.

  I have checked program->getHandle is a valid program Here are the values of all handles: Program handle 3 ambientHandle 0 diffuseHandle 1 specularHandle 5 lightPosHandle 2 shinyHandle 4

  So they all look good. For testing I am commenting out the lines below the ones for ambientProduct. For clarity I am explicitly using this line instead

  glUniform4f( ambientHandle, ambientProd.x, ambientProd.y, ambientProd.z, ambientProd.w );
  

  These are the values for ambientProd at the time that line is executed. x = 0.200000003, y = 0.0, z = 0.200000003, w = 1.0

  A collaborator on this project moved the call for glUseProgram. Thanks for the help folks.

  Error number ´1282` is not very descriptive.

  Possible error codes for glGetUniformLocation are:

  GL_INVALID_VALUE
  GL_INVALID_OPERATION
  

  Which don't have a fixed value. Try to get the error string with gluErrorString() or take a look in the header to which of those 1282 maps.

  Just a shot in the dark: but did you ...

  • check your shader got compiled without error?

  • check your shader got linked without error?

  BTW: return type is GLint not GLuint

  "Shaders compiled and linked without error" Hmm, this looks odd.

  According to spec (see: http://www.opengl.org/sdk/docs/man/xhtml/glGetUniformLocation.xml) GL_INVALID_OPERATION should only be generated if:

  • program is not a program objec

  • program has not been successfully linked

  Other question:

  • are you sure the getHandle()method of the class your program Object belongs to returns the right id. I mean the one that was used in the sucessfully linking.

    you should be able to verify with checking if glIsProgram(program-getHandle()) returns GL_TRUE

  EDIT: Ah - I missed those calls to glUniform4fv in your example.

  Correct return type for glGetUniformLocation is still GLint, but I don't think thats the problem.

  According to spec (see: http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml) GLUniformXX generates GL_INVALID_OPERATION for a whole bunch of reasons. To me the only one that possibly seems to apply is:

  • there is no current program object

    Did you call glUseProgram (program->getHandle()) prior to trying to calling glUniform()?