Lines Matching refs:fog

40     Ideally, the fog distance (used to compute the fog factor as
45     [the fog factor] f need not be computed at each fragment, but may
49     OpenGL computes the distance used in computing the fog factor.
51     The extension supports three fog distance modes: "eye plane absolute",
52     where the fog distance is the absolute planar distance from the eye
54     "eye plane", where the fog distance is the signed planar distance
55     from the eye plane; and "eye radial", where the fog distance is
57     fog distance mode, the distance may be computed per-vertex and then
61     control over the tradeoff between performance and fog quality.
65     mode can provide for more accurate fog at the edges of the field of
66     view, but this assumes that either the eye radial fog distance is
67     computed per-fragment, or if the fog distance is computed per-vertex
81       the default fog distance mode is left implementation dependent.
83       fast EYE_RADIAL_NV fog distance to be stuck using something less.
92       then the fog distance mode is ignored.  However, the fog
95       functionality is enabled, the fog distance is supplied by the
96       user-supplied fog-coordinate so no automatic fog distance computation
131     constant determines how the fog distance should be computed."
136     "When the fog distance mode is EYE_PLANE_ABSOLUTE_NV, the fog
138     of the fragment's eye position].  When the fog distance mode is
139     EYE_PLANE, the fog distance z is approximated by ze.  When the
140     fog distance mode is EYE_RADIAL_NV, the fog distance z is computed
146     In the EYE_RADIAL_NV fog distance mode, the Euclidean distance
152     "The state required for fog consists of a three valued integer to
153     select the fog equation, a three valued integer to select the fog
154     distance mode, three floating-point values d, e, and s, and RGBA fog
155     color and a fog color index, and a single bit to indicate whether
156     or not fog is enabled.  In the initial state, fog is disabled,
194 FOG_DISTANCE_MODE_NV   Z3      GetIntegerv  implementation     Determines how   3.10    fog
195                                             dependent          fog distance