http://bugs.freedesktop.org/show_bug.cgi?id=10686
Summary: calculation of Bitmap's Fog color is incorrect
Product: Mesa
Version: CVS
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
If we enable fog when draw a bitmap, the fog color calculation is incorrect.
Root cause:
In func _swrast_Bitmap (swrast/s_bitmap.c), at Line 93 it calls
_swrast_span_default_fog() which modify the fog coord value:
span->attrStart[FRAG_ATTRIB_FOGC][0]
= _swrast_z_to_fogfactor(ctx, ctx->Current.RasterDistance);
So the fog coord state value becomes the fog factor.
Line 150, _swrast_Bitmap() calls--> _swrast_write_rgba_span(ctx, &span)
-->_swrast_fog_rgba_span(ctx, span) which calls macro FOG_LOOP(swrast/s_fog.c
L73).
In macro FOG_LOOP, it still use span->attrStart[FRAG_ATTRIB_FOGC][0] as the fog
coord which has been changed in _swrast_span_default_fog().
We should not call _swrast_span_default_fog to change the fog coord state
value, does it?
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