From 09da0b8e6621a831e3eeb9381430f2bed18a22ad Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 17 Feb 2004 21:03:03 +0000
Subject: A bit of an overhaul of the fog code. glFogCoord didn't always work
 reliably. ARB fragment program fog options work now. Per-fragment fog
 computations are now perspective corrected.

---
 src/mesa/tnl/t_context.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src/mesa/tnl/t_context.c')

diff --git a/src/mesa/tnl/t_context.c b/src/mesa/tnl/t_context.c
index ec5f88cd96..626aa5290e 100644
--- a/src/mesa/tnl/t_context.c
+++ b/src/mesa/tnl/t_context.c
@@ -102,6 +102,7 @@ _tnl_CreateContext( GLcontext *ctx )
    tnl->NeedNdcCoords = GL_TRUE;
    tnl->LoopbackDListCassettes = GL_FALSE;
    tnl->CalcDListNormalLengths = GL_TRUE;
+   tnl->AllowVertexFog = GL_TRUE;
 
    /* Hook our functions into exec and compile dispatch tables.
     */
@@ -144,6 +145,10 @@ _tnl_InvalidateState( GLcontext *ctx, GLuint new_state )
 {
    TNLcontext *tnl = TNL_CONTEXT(ctx);
 
+   if (new_state & (_NEW_HINT)) {
+      tnl->_DoVertexFog = tnl->AllowVertexFog && (ctx->Hint.Fog != GL_NICEST);
+   }
+
    if (new_state & _NEW_ARRAY) {
       tnl->pipeline.run_input_changes |= ctx->Array.NewState; /* overkill */
    }
@@ -259,3 +264,11 @@ _tnl_isolate_materials( GLcontext *ctx, GLboolean mode )
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    tnl->IsolateMaterials = mode;
 }
+
+void
+_tnl_allow_vertex_fog( GLcontext *ctx, GLboolean value )
+{
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   tnl->AllowVertexFog = value;
+}
+
-- 
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