CODEWITHSUNDEEP
opengl
Peter Hwang
Peter Hwang

Reputation: 991

Opengl glGenVertexArrays error

I was trying to make 5 vertex array objects(vao) using 1 array for init() function.

However, glGenVertexArrays( 5, &vao ) throws me an error and I don't understand why it does.

I guess I don't fully understand the behavior of the function.

Can anyone tell me what's going on here?

Here is my original code:

void
init(){
  // Subdivide a tetrahedron into a sphere
  Index = 0; tetrahedron( 1, 0, NumTimesToSubdivide-4 );
  Index = 0; tetrahedron( 0, 1, NumTimesToSubdivide-3 );
  Index = 0; tetrahedron( 0, 2, NumTimesToSubdivide-2 );
  Index = 0; tetrahedron( 0, 3, NumTimesToSubdivide-1);
  Index = 0; tetrahedron( 0, 4, NumTimesToSubdivide );

  // Create a vertex array object
  **glGenVertexArrays( 5, &vao ); // Error occurs on this line**
  for ( int i=0; i<5; i++ )
  {

    glBindVertexArray( vao[i] ); 
    GLuint buffer;
    glGenBuffers( 1, &buffer );
    glBindBuffer( GL_ARRAY_BUFFER, buffer );
    glBufferData( GL_ARRAY_BUFFER, sizeof(points[i]) + sizeof(normals[i]),NULL, GL_STATIC_DRAW );
    glBufferSubData( GL_ARRAY_BUFFER, 0, sizeof(points[i]), &(points[i]) );
    glBufferSubData( GL_ARRAY_BUFFER, sizeof(points[i]),sizeof(normals[i]), &(normals[i]) );
  }
  // Load shaders and use the resulting shader program
  GLuint program = InitShader( "vshader.glsl", "fshader.glsl" );
  glUseProgram( program );

  // set up vertex arrays
  GLuint vPosition = glGetAttribLocation( program, "vPosition" );
  glEnableVertexAttribArray( vPosition );
  glVertexAttribPointer( vPosition, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0) );

  GLuint vNormal = glGetAttribLocation( program, "vNormal" );
  glEnableVertexAttribArray( vNormal );
  glVertexAttribPointer( vNormal, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(sizeof(points)) );

  AmbientProduct = glGetUniformLocation(program, "AmbientProduct");
  DiffuseProduct = glGetUniformLocation(program, "DiffuseProduct");
  SpecularProduct = glGetUniformLocation(program, "SpecularProduct");
  LightPosition = glGetUniformLocation(program, "LightPosition");
  Shininess = glGetUniformLocation(program, "Shininess");
  Transformation = glGetUniformLocation( program, "Transformation" );
  View = glGetUniformLocation( program, "View" );
  Projection = glGetUniformLocation( program, "Projection" );

  glEnable( GL_DEPTH_TEST );
  glClearColor(0.0, 0.0, 0.0, 0.0 ); /* Black background */
}

Here is the error messages:

error C2664: 'void (GLsizei,GLuint *)' : cannot convert parameter 2 from 'GLuint (*)[5]' to 'GLuint *'
1>          Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

error C2664: 'void (GLsizei,GLuint *)' : cannot convert parameter 1 from 'GLuint (*)[5]' to 'GLsizei'
1>          There is no context in which this conversion is possible

Upvotes: 3

Views: 1706

Answers (1)

genpfault
genpfault

Reputation: 52164

Arrays are already pointers. You don't need the &:

glGenVertexArrays( 5, vao );

Upvotes: 3

Related Questions