15 #ifndef vtkOpenGLHelper_h 
   16 #define vtkOpenGLHelper_h 
   18 #include "vtkRenderingOpenGL2Module.h"  
   42   void ReleaseGraphicsResources(
vtkWindow *win);
 
   45 #endif // vtkOpenGLHelper_h 
manage Shader Programs within a context 
 
vtkShaderProgram * Program
 
record modification and/or execution time 
 
vtkOpenGLVertexArrayObject * VAO
 
window superclass for vtkRenderWindow 
 
vtkTimeStamp AttributeUpdateTime
 
The VertexArrayObject class uses, or emulates, vertex array objects. 
 
vtkOpenGLIndexBufferObject * IBO
 
vtkTimeStamp ShaderSourceTime
 
OpenGL vertex buffer object. 
 
The ShaderProgram uses one or more Shader objects.