mesa: Remove SWcontext::_FogMode, use gl_context::gl_fog_attrib::Mode everywhere

Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/swrast/s_context.c

@@ -252,7 +252,6 @@ _swrast_update_fog_state( struct gl_context *ctx )
 
    /* determine if fog is needed, and if so, which fog mode */
    swrast->_FogEnabled = (fp == NULL && ctx->Fog.Enabled);
-   swrast->_FogMode = ctx->Fog.Mode;
 }
 
 

src/mesa/swrast/s_context.h

@@ -135,7 +135,6 @@ typedef struct
    GLboolean _TextureCombinePrimary;
    GLboolean _FogEnabled;
    GLboolean _DeferredTexture;
-   GLenum _FogMode;  /* either GL_FOG_MODE or fragment program's fog mode */
 
    /** List/array of the fragment attributes to interpolate */
    GLuint _ActiveAttribs[FRAG_ATTRIB_MAX];

src/mesa/swrast/s_fog.c

@@ -158,7 +158,7 @@ _swrast_fog_rgba_span( const struct gl_context *ctx, SWspan *span )
       /* The span's fog values are fog coordinates, now compute blend factors
        * and blend the fragment colors with the fog color.
        */
-      switch (swrast->_FogMode) {
+      switch (ctx->Fog.Mode) {
       case GL_LINEAR:
          {
             const GLfloat fogEnd = ctx->Fog.End;