Sets the DepthTestFunction used to compare the depth value of an incoming fragment against the corresponding value in the current depth buffer.
By default the depth test function is cogl_depth_test_function_less
NB: this won't directly affect the state of the GPU. You have to then set the state on a Pipeline using set_depth_state
| this |
A DepthState struct |
| function |
The DepthTestFunction to set |