glClearDepth05

glClearDepth05 is a function in the OpenGL API that sets the depth value used by the glClear function to clear the depth buffer. The function takes a single parameter, depth, which specifies the value to which the depth buffer is to be cleared. The depth parameter is a floating-point number in the range [0, 1], where 0 represents the nearest depth value and 1 represents the farthest depth value.

The glClearDepth05 function is typically used in conjunction with the glClear function to clear the depth buffer to a specific value. This can be useful in various rendering techniques, such as shadow mapping, where the depth buffer is used to store depth information for a light source. By setting the depth value to 0.5 using glClearDepth05, the depth buffer can be cleared to the middle of the depth range, which can be useful for certain rendering algorithms.

It is important to note that the glClearDepth05 function is not part of the core OpenGL API and is instead provided as an extension. Therefore, its availability may depend on the specific OpenGL implementation and the supported extensions. Additionally, the use of glClearDepth05 may have performance implications, as clearing the depth buffer can be an expensive operation in terms of rendering performance. Therefore, it is important to use this function judiciously and only when necessary.