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new comments, rename some stuff

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This commit is contained in:
Brian Paul 2004-02-13 03:00:11 +00:00
parent 71996ddbe1
commit de47068b85
1 changed files with 13 additions and 6 deletions
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19
src/mesa/tnl/t_vb_fog.c
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@ -1,9 +1,8 @@
/*
* Mesa 3-D graphics library
* Version: 5.1
* Version: 6.1
*
* Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@ -83,8 +82,15 @@ static void init_static_data( void )
}
static void make_win_fog_coords( GLcontext *ctx, GLvector4f *out,
const GLvector4f *in )
/**
* Compute per-vertex fog blend factors from fog coordinates by
* evaluating the GL_LINEAR, GL_EXP or GL_EXP2 fog function.
* Fog coordinates are distances from the eye (typically between the
* near and far clip plane distances).
* Fog blend factors are in the range [0,1].
*/
static void compute_fog_blend_factors( GLcontext *ctx, GLvector4f *out,
const GLvector4f *in )
{
GLfloat end = ctx->Fog.End;
GLfloat *v = in->start;
@ -184,7 +190,8 @@ static GLboolean run_fog_stage( GLcontext *ctx,
VB->FogCoordPtr = &store->fogcoord;
}
make_win_fog_coords( ctx, VB->FogCoordPtr, input );
/* compute blend factors from fog coordinates */
compute_fog_blend_factors( ctx, VB->FogCoordPtr, input );
VB->AttribPtr[_TNL_ATTRIB_FOG] = VB->FogCoordPtr;
return GL_TRUE;