Method
CoglDepthStateset_range
Declaration [src]
void
cogl_depth_state_set_range (
CoglDepthState* state,
float near_val,
float far_val
)
Description [src]
Sets the range to map depth values in normalized device coordinates to before writing out to a depth buffer.
After your geometry has be transformed, clipped and had perspective division applied placing it in normalized device coordinates all depth values between the near and far z clipping planes are in the range -1 to 1. Before writing any depth value to the depth buffer though the value is mapped into the range [0, 1].
With this function you can change the range which depth values are mapped too although the range must still lye within the range [0, 1].
By default normalized device coordinate depth values are mapped to the full range of depth buffer values, [0, 1].
NB: this won’t directly affect the state of the GPU. You have
to then set the state on a CoglPipeline using cogl_pipeline_set_depth_state().