[Bug 12641] WineD3d does not respect GL_EXT_fog_coord

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=12641





--- Comment #3 from Markus Amsler <markus.amsler at oribi.org>  2008-10-17 16:02:07 ---
I'm not sure anymore if this is a bug.

copied from ARB_vertex_program specification:

Dependencies on EXT_fog_coord

    If EXT_fog_coord is not supported, references to fog coordinates should be
    removed from Table X.1, and the description of ArrayElement in section
    2.8.  The line "fogcoord" should be removed from the <vtxAttribItem>
    grammar rule, and "vertex.fogcoord" should be removed from Table X.2.
    Also, the use of FOG_COORDINATE_SOURCE_EXT in section 3.10 should be
    removed.

    Even if EXT_fog_coord is not supported, the fog coordinate output
    (result.fogcoord) still operates as specified.  When in vertex program
    mode, there are no well-defined eye coordinates that could be used for
    fog.  This means that the functionality of EXT_fog_coord is required to
    implement ARB_vertex_program even if the EXT_fog_coord extension itself is
    not supported.

For me this looks like paragraph 1(vertex.fogcoord not supported) contradicts
paragraph 2 (EXT_fog_coord is required to implement ARB_vertex_program).


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