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glDepthMask - enable or disable writing into the depth buffer 
 
void glDepthMask( GLboolean flag ) 
 
- flag 
- Specifies whether the depth buffer is enabled for writing.
If flag is GL_FALSE, depth buffer writing is disabled. Otherwise, it is
enabled. Initially, depth buffer writing is enabled. 
glDepthMask
specifies whether the depth buffer is enabled for writing. If flag is GL_FALSE,
depth buffer writing is disabled. Otherwise, it is enabled. Initially, depth
buffer writing is enabled. 
GL_INVALID_OPERATION is generated if glDepthMask
is executed between the execution of glBegin and the corresponding execution
of glEnd. 
glGet with argument GL_DEPTH_WRITEMASK 
glColorMask(3G)
,
glDepthFunc(3G)
, glDepthRange(3G)
, glIndexMask(3G)
, glStencilMask(3G)
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