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glNextVisibilityTesthp

Chapter 12

294

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

HP b2600 Reference Guide

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