HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 294

N glNextVisibilityTesthp glNextVisibilityTesthp glNextVisibilityTesthp - end the current visibility test and begin the next. C Specification void glNextVisibilityTesthp(void) Parameters None Description glNextVisibilityTesthp is used in conjunction with glVisibilityBufferhp to test the visibility of primitives against the current contents of the depth buffer. With glVisibilityBufferhp, the programmer specifies a boolean array in which to store the results of the visibility tests; a call to glNextVisibilityTesthp finishes the current test (eventually placing the results of the test in the current position of the array specified by glVisiblityBufferhp), and beginning the next test, whose results will be placed in the subsequent entry of the array. Visibility Testing is enabled by a call to glEnable(VISIBILITY_TEST_hp). Making this call to glEnable (if VISIBILITY_TEST_hp has not already been enabled) causes Visibility Testing to begin, and sets the result destination to be the first entry in the buffer specified by glVisibilityBufferhp. Notes None Errors GL_INVALID_OPERATION is generated if glNextVisibilityTesthp is called and VISIBILITY_TEST_hp has not been enabled via glEnable(). GL_INVALID_OPERATION is generated if glVisibiliyBufferhp is called between a call to glBegin and the corresponding call to glEnd. Associated Gets None See Also glVisibilityBufferhp 294 Chapter 12