enable GL_EXT_fog_coord. Calculate fog factors and submit them instead of fog coords (it seems the chip cannot do fog factor computation when not using fragment depth as fog coord source). vtxfmt uses fallback for now (most code present but some magic would be needed if replaying vertices is necessary later on).

9 files changed, 266 insertions, 9 deletions

diff --git a/src/mesa/drivers/dri/r200/r200_context.c b/src/mesa/drivers/dri/r200/r200_context.c
index 0868febc34..d5d2ce150a 100644
--- a/src/mesa/drivers/dri/r200/r200_context.c
+++ b/src/mesa/drivers/dri/r200/r200_context.c
@@ -131,6 +131,7 @@ static const char * const card_extensions[] =
     "GL_ARB_vertex_buffer_object",
     "GL_EXT_blend_minmax",
     "GL_EXT_blend_subtract",
+    "GL_EXT_fog_coord",
     "GL_EXT_secondary_color",
     "GL_EXT_stencil_wrap",
     "GL_EXT_texture_edge_clamp",
@@ -252,6 +253,9 @@ GLboolean r200CreateContext( const __GLcontextModes *glVisual,
    rmesa = (r200ContextPtr) CALLOC( sizeof(*rmesa) );
    if ( !rmesa )
       return GL_FALSE;
+      
+   /* init exp fog table data */
+   r200InitStaticFogData();
 
    /* Parse configuration files.
     * Do this here so that initialMaxAnisotropy is set before we create
diff --git a/src/mesa/drivers/dri/r200/r200_context.h b/src/mesa/drivers/dri/r200/r200_context.h
index af07653244..9af5c9390a 100644
--- a/src/mesa/drivers/dri/r200/r200_context.h
+++ b/src/mesa/drivers/dri/r200/r200_context.h
@@ -731,6 +731,8 @@ struct dfn_lists {
    struct dynfn MultiTexCoord2fvARB;
    struct dynfn MultiTexCoord1fARB;
    struct dynfn MultiTexCoord1fvARB;
+   struct dynfn FogCoordfEXT;
+   struct dynfn FogCoordfvEXT;
 };
 
 struct dfn_generators {
@@ -764,6 +766,8 @@ struct dfn_generators {
    struct dynfn *(*MultiTexCoord2fvARB)( GLcontext *, const int * );
    struct dynfn *(*MultiTexCoord1fARB)( GLcontext *, const int * );
    struct dynfn *(*MultiTexCoord1fvARB)( GLcontext *, const int * );
+   struct dynfn *(*FogCoordfEXT)( GLcontext *, const int * );
+   struct dynfn *(*FogCoordfvEXT)( GLcontext *, const int * );
 };
 
 
@@ -797,6 +801,7 @@ struct r200_vbinfo {
 
    GLfloat *normalptr;
    GLfloat *floatcolorptr;
+   GLfloat *fogptr;
    r200_color_t *colorptr;
    GLfloat *floatspecptr;
    r200_color_t *specptr;
diff --git a/src/mesa/drivers/dri/r200/r200_maos_arrays.c b/src/mesa/drivers/dri/r200/r200_maos_arrays.c
index 0f8ca3048e..12ea462a40 100644
--- a/src/mesa/drivers/dri/r200/r200_maos_arrays.c
+++ b/src/mesa/drivers/dri/r200/r200_maos_arrays.c
@@ -49,6 +49,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "r200_state.h"
 #include "r200_swtcl.h"
 #include "r200_maos.h"
+#include "r200_tcl.h"
 
 
 #if 0
@@ -175,7 +176,47 @@ do {						\
 #endif
 
 
+static void emit_vecfog( GLcontext *ctx,
+			 struct r200_dma_region *rvb,
+			 char *data,
+			 int stride,
+			 int count )
+{
+   int i;
+   GLfloat *out;
 
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);
+   
+   if (R200_DEBUG & DEBUG_VERTS)
+      fprintf(stderr, "%s count %d stride %d\n",
+	      __FUNCTION__, count, stride);
+
+   assert (!rvb->buf);
+
+   if (stride == 0) {
+      r200AllocDmaRegion( rmesa, rvb, 4, 4 );
+      count = 1;
+      rvb->aos_start = GET_START(rvb);
+      rvb->aos_stride = 0;
+      rvb->aos_size = 1;
+   }
+   else {
+      r200AllocDmaRegion( rmesa, rvb, count * 4, 4 );	/* alignment? */
+      rvb->aos_start = GET_START(rvb);
+      rvb->aos_stride = 1;
+      rvb->aos_size = 1;
+   }
+
+   /* Emit the data
+    */
+   out = (GLfloat *)(rvb->address + rvb->start);
+   for (i = 0; i < count; i++) {
+      out[0] = r200ComputeFogBlendFactor( ctx, *(GLfloat *)data );
+      out++;
+      data += stride;
+   }
+
+}
 
 
 static void emit_vec4( GLcontext *ctx,
@@ -378,6 +419,18 @@ void r200EmitArrays( GLcontext *ctx, GLuint inputs )
       component[nr++] = &rmesa->tcl.norm;
    }
 
+   if (inputs & VERT_BIT_FOG) {
+      if (!rmesa->tcl.fog.buf)
+	 emit_vecfog( ctx, 
+		      &(rmesa->tcl.fog), 
+		      (char *)VB->FogCoordPtr->data,
+		      VB->FogCoordPtr->stride,
+		      count);
+
+      vfmt0 |= R200_VTX_DISCRETE_FOG;
+      component[nr++] = &rmesa->tcl.fog;
+   }
+ 
    if (inputs & VERT_BIT_COLOR0) {
       int emitsize;
 
@@ -460,6 +513,9 @@ void r200ReleaseArrays( GLcontext *ctx, GLuint newinputs )
 
    if (newinputs & VERT_BIT_NORMAL) 
       r200ReleaseDmaRegion( rmesa, &rmesa->tcl.norm, __FUNCTION__ );
+      
+   if (newinputs & VERT_BIT_FOG) 
+      r200ReleaseDmaRegion( rmesa, &rmesa->tcl.fog, __FUNCTION__ );
 
    if (newinputs & VERT_BIT_COLOR0) 
       r200ReleaseDmaRegion( rmesa, &rmesa->tcl.rgba, __FUNCTION__ );
diff --git a/src/mesa/drivers/dri/r200/r200_state.c b/src/mesa/drivers/dri/r200/r200_state.c
index 825c036e27..7701256edf 100644
--- a/src/mesa/drivers/dri/r200/r200_state.c
+++ b/src/mesa/drivers/dri/r200/r200_state.c
@@ -468,10 +468,37 @@ static void r200Fogfv( GLcontext *ctx, GLenum pname, const GLfloat *param )
       rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] &= ~R200_FOG_COLOR_MASK;
       rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] |= i;
       break;
-   case GL_FOG_COORDINATE_SOURCE_EXT: 
-      /* What to do?
-       */
+   case GL_FOG_COORD_SRC: {
+      GLuint fmt_0 = rmesa->hw.vtx.cmd[VTX_VTXFMT_0];
+      GLuint out_0 = rmesa->hw.vtx.cmd[VTX_TCL_OUTPUT_VTXFMT_0];
+      GLuint fog   = rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR];
+
+      fog &= ~R200_FOG_USE_MASK;
+      if ( ctx->Fog.FogCoordinateSource == GL_FOG_COORD ) {
+	 fog   |= R200_FOG_USE_VTX_FOG;
+	 fmt_0 |= R200_VTX_DISCRETE_FOG;
+	 out_0 |= R200_VTX_DISCRETE_FOG;
+      }
+      else {
+	 fog   |=  R200_FOG_USE_SPEC_ALPHA;
+	 fmt_0 &= ~R200_VTX_DISCRETE_FOG;
+	 out_0 &= ~R200_VTX_DISCRETE_FOG;
+      }
+
+      if ( fog != rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] ) {
+	 R200_STATECHANGE( rmesa, ctx );
+	 rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] = fog;
+      }
+
+      if ( (fmt_0 != rmesa->hw.vtx.cmd[VTX_VTXFMT_0])
+	   || (out_0 != rmesa->hw.vtx.cmd[VTX_TCL_OUTPUT_VTXFMT_0])) {
+	 R200_STATECHANGE( rmesa, vtx );
+	 rmesa->hw.vtx.cmd[VTX_VTXFMT_0] = fmt_0;
+	 rmesa->hw.vtx.cmd[VTX_TCL_OUTPUT_VTXFMT_0] = out_0;	 
+      }
+
       break;
+   }
    default:
       return;
    }
diff --git a/src/mesa/drivers/dri/r200/r200_swtcl.c b/src/mesa/drivers/dri/r200/r200_swtcl.c
index 4c6f19da4f..7fb91a0730 100644
--- a/src/mesa/drivers/dri/r200/r200_swtcl.c
+++ b/src/mesa/drivers/dri/r200/r200_swtcl.c
@@ -172,7 +172,12 @@ static void r200SetVertexFormat( GLcontext *ctx )
       }
    }
 
-
+   if ( (rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] & R200_FOG_USE_MASK)
+      != R200_FOG_USE_SPEC_ALPHA ) {
+      R200_STATECHANGE( rmesa, ctx );
+      rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] &= ~R200_FOG_USE_MASK;
+      rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] |= R200_FOG_USE_SPEC_ALPHA;
+   }
 
    if ( rmesa->tnl_index != index ||
 	(rmesa->hw.vtx.cmd[VTX_VTXFMT_0] != fmt_0) ||
diff --git a/src/mesa/drivers/dri/r200/r200_tcl.c b/src/mesa/drivers/dri/r200/r200_tcl.c
index 78d16ed0f3..d2dfc5fda1 100644
--- a/src/mesa/drivers/dri/r200/r200_tcl.c
+++ b/src/mesa/drivers/dri/r200/r200_tcl.c
@@ -269,6 +269,90 @@ void r200TclPrimitive( GLcontext *ctx,
 
 
 /**********************************************************************/
+/*             Fog blend factor computation for hw tcl                */
+/*             same calculation used as in t_vb_fog.c                 */
+/**********************************************************************/
+
+#define FOG_EXP_TABLE_SIZE 256
+#define FOG_MAX (10.0)
+#define EXP_FOG_MAX .0006595
+#define FOG_INCR (FOG_MAX/FOG_EXP_TABLE_SIZE)
+static GLfloat exp_table[FOG_EXP_TABLE_SIZE];
+
+#if 1
+#define NEG_EXP( result, narg )						\
+do {									\
+   GLfloat f = (GLfloat) (narg * (1.0/FOG_INCR));			\
+   GLint k = (GLint) f;							\
+   if (k > FOG_EXP_TABLE_SIZE-2) 					\
+      result = (GLfloat) EXP_FOG_MAX;					\
+   else									\
+      result = exp_table[k] + (f-k)*(exp_table[k+1]-exp_table[k]);	\
+} while (0)
+#else
+#define NEG_EXP( result, narg )					\
+do {								\
+   result = exp(-narg);						\
+} while (0)
+#endif
+
+
+/**
+ * Initialize the exp_table[] lookup table for approximating exp().
+ */
+void
+r200InitStaticFogData( void )
+{
+   GLfloat f = 0.0F;
+   GLint i = 0;
+   for ( ; i < FOG_EXP_TABLE_SIZE ; i++, f += FOG_INCR) {
+      exp_table[i] = (GLfloat) exp(-f);
+   }
+}
+
+
+/**
+ * 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).
+ * Note the fog (eye Z) coords may be negative so we use ABS(z) below.
+ * Fog blend factors are in the range [0,1].
+ */
+float
+r200ComputeFogBlendFactor( GLcontext *ctx, GLfloat fogcoord )
+{
+   GLfloat end  = ctx->Fog.End;
+   GLfloat d, temp;
+   const GLfloat z = FABSF(fogcoord);
+
+   switch (ctx->Fog.Mode) {
+   case GL_LINEAR:
+      if (ctx->Fog.Start == ctx->Fog.End)
+         d = 1.0F;
+      else
+         d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
+      temp = (end - z) * d;
+      return CLAMP(temp, 0.0F, 1.0F);
+      break;
+   case GL_EXP:
+      d = ctx->Fog.Density;
+      NEG_EXP( temp, d * z );
+      return temp;
+      break;
+   case GL_EXP2:
+      d = ctx->Fog.Density*ctx->Fog.Density;
+      NEG_EXP( temp, d * z * z );
+      return temp;
+      break;
+   default:
+      _mesa_problem(ctx, "Bad fog mode in make_fog_coord");
+      return 0;
+   }
+}
+
+
+/**********************************************************************/
 /*                          Render pipeline stage                     */
 /**********************************************************************/
 
@@ -349,6 +433,10 @@ static void r200_check_tcl_render( GLcontext *ctx,
 	 }
       }
 
+      if ( ctx->Fog.FogCoordinateSource == GL_FOG_COORD ) {
+	 inputs |= VERT_BIT_FOG;
+      }
+
       for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++) {
 	 if (ctx->Texture.Unit[unit]._ReallyEnabled) {
 	    if (rmesa->TexGenNeedNormals[unit]) {
@@ -457,6 +545,14 @@ static void transition_to_hwtnl( GLcontext *ctx )
    rmesa->hw.vap.cmd[VAP_SE_VAP_CNTL] |= R200_VAP_TCL_ENABLE;
    rmesa->hw.vap.cmd[VAP_SE_VAP_CNTL] &= ~R200_VAP_FORCE_W_TO_ONE;
 
+   if ( ((rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] & R200_FOG_USE_MASK)
+      == R200_FOG_USE_SPEC_ALPHA) &&
+      (ctx->Fog.FogCoordinateSource == GL_FOG_COORD )) {
+      R200_STATECHANGE( rmesa, ctx );
+      rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] &= ~R200_FOG_USE_MASK;
+      rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] |= R200_FOG_USE_VTX_FOG;
+   }
+   
    R200_STATECHANGE( rmesa, vte );
    rmesa->hw.vte.cmd[VTE_SE_VTE_CNTL] &= ~(R200_VTX_XY_FMT|R200_VTX_Z_FMT);
 
diff --git a/src/mesa/drivers/dri/r200/r200_tcl.h b/src/mesa/drivers/dri/r200/r200_tcl.h
index b6ec8e28f8..7dd43bf7fa 100644
--- a/src/mesa/drivers/dri/r200/r200_tcl.h
+++ b/src/mesa/drivers/dri/r200/r200_tcl.h
@@ -47,6 +47,10 @@ extern void r200EmitPrimitive( GLcontext *ctx, GLuint first, GLuint last,
 				 GLuint flags );
 
 extern void r200TclFallback( GLcontext *ctx, GLuint bit, GLboolean mode );
+
+extern void r200InitStaticFogData( void );
+
+extern float r200ComputeFogBlendFactor( GLcontext *ctx, GLfloat fogcoord );
 					      
 #define R200_TCL_FALLBACK_RASTER            0x1 /* rasterization */
 #define R200_TCL_FALLBACK_UNFILLED          0x2 /* unfilled tris */
diff --git a/src/mesa/drivers/dri/r200/r200_vtxfmt.c b/src/mesa/drivers/dri/r200/r200_vtxfmt.c
index 7a2fa35d44..fde2141026 100644
--- a/src/mesa/drivers/dri/r200/r200_vtxfmt.c
+++ b/src/mesa/drivers/dri/r200/r200_vtxfmt.c
@@ -100,6 +100,8 @@ static void count_funcs( r200ContextPtr rmesa )
    count_func( "MultiTexCoord2fvARB", &rmesa->vb.dfn_cache.MultiTexCoord2fvARB );
    count_func( "MultiTexCoord1fARB", &rmesa->vb.dfn_cache.MultiTexCoord1fARB );
    count_func( "MultiTexCoord1fvARB", &rmesa->vb.dfn_cache.MultiTexCoord1fvARB );
+/*   count_func( "FogCoordfEXT", &rmesa->vb.dfn_cache.FogCoordfEXT );
+   count_func( "FogCoordfvEXT", &rmesa->vb.dfn_cache.FogCoordfvEXT );*/
 }
 
 
@@ -119,6 +121,10 @@ void r200_copy_to_current( GLcontext *ctx )
       ctx->Current.Attrib[VERT_ATTRIB_NORMAL][2] = rmesa->vb.normalptr[2];
    }
 
+   if (rmesa->vb.vtxfmt_0 & R200_VTX_DISCRETE_FOG) {
+      ctx->Current.Attrib[VERT_ATTRIB_FOG][0] = rmesa->vb.fogptr[0];
+   }
+
    switch( VTX_COLOR(rmesa->vb.vtxfmt_0, 0) ) {
    case R200_VTX_PK_RGBA:
       ctx->Current.Attrib[VERT_ATTRIB_COLOR0][0] = UBYTE_TO_FLOAT( rmesa->vb.colorptr->red );
@@ -474,6 +480,11 @@ void VFMT_FALLBACK( const char *caller )
 	 offset += 3;
       }
 
+      if (ind0 & R200_VTX_DISCRETE_FOG) {
+	 GL_CALL(FogCoordfvEXT)( &tmp[i][offset] ); 
+	 offset++;
+      }
+
       if (VTX_COLOR(ind0, 0) == R200_VTX_PK_RGBA) {
 	 GL_CALL(Color4ubv)( (GLubyte *)&tmp[i][offset] ); 
 	 offset++;
@@ -504,7 +515,10 @@ void VFMT_FALLBACK( const char *caller )
    /* Replay current vertex
     */
    if (ind0 & R200_VTX_N0) 
-       GL_CALL(Normal3fv)( rmesa->vb.normalptr );
+      GL_CALL(Normal3fv)( rmesa->vb.normalptr );
+   if (ind0 & R200_VTX_DISCRETE_FOG) {
+      GL_CALL(FogCoordfvEXT)( rmesa->vb.fogptr ); 
+   }
 
    if (VTX_COLOR(ind0, 0) == R200_VTX_PK_RGBA) {
       GL_CALL(Color4ub)( rmesa->vb.colorptr->red,
@@ -672,6 +686,10 @@ static GLboolean check_vtx_fmt( GLcontext *ctx )
       }
    }
 
+   if ( ctx->Fog.FogCoordinateSource == GL_FOG_COORD ) {
+      ind0 |= R200_VTX_DISCRETE_FOG;
+   }
+
    for ( i = 0 ; i < ctx->Const.MaxTextureUnits ; i++ ) {
       count[i] = 0;
 
@@ -711,6 +729,7 @@ static GLboolean check_vtx_fmt( GLcontext *ctx )
    rmesa->vb.normalptr = ctx->Current.Attrib[VERT_ATTRIB_NORMAL];
    rmesa->vb.colorptr = NULL;
    rmesa->vb.floatcolorptr = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
+   rmesa->vb.fogptr = ctx->Current.Attrib[VERT_ATTRIB_FOG];
    rmesa->vb.specptr = NULL;
    rmesa->vb.floatspecptr = ctx->Current.Attrib[VERT_ATTRIB_COLOR1];
    rmesa->vb.texcoordptr[0] = ctx->Current.Attrib[VERT_ATTRIB_TEX0];
@@ -733,6 +752,12 @@ static GLboolean check_vtx_fmt( GLcontext *ctx )
       rmesa->vb.normalptr[2] = ctx->Current.Attrib[VERT_ATTRIB_NORMAL][2];
    }
 
+   if (ind0 & R200_VTX_DISCRETE_FOG) {
+      rmesa->vb.fogptr = &rmesa->vb.vertex[rmesa->vb.vertex_size].f;
+      rmesa->vb.vertex_size += 1;
+      rmesa->vb.fogptr[0] = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
+   }
+
    if (VTX_COLOR(ind0, 0) == R200_VTX_PK_RGBA) {
       rmesa->vb.colorptr = &rmesa->vb.vertex[rmesa->vb.vertex_size].color;
       rmesa->vb.vertex_size += 1;
@@ -1060,8 +1085,6 @@ void r200VtxfmtInit( GLcontext *ctx, GLboolean useCodegen )
 
    /* Not active in supported states; just keep ctx->Current uptodate:
     */
-   vfmt->FogCoordfvEXT = _mesa_noop_FogCoordfvEXT;
-   vfmt->FogCoordfEXT = _mesa_noop_FogCoordfEXT;
    vfmt->EdgeFlag = _mesa_noop_EdgeFlag;
    vfmt->EdgeFlagv = _mesa_noop_EdgeFlagv;
    vfmt->Indexf = _mesa_noop_Indexf;
@@ -1094,7 +1117,9 @@ void r200VtxfmtInit( GLcontext *ctx, GLboolean useCodegen )
    vfmt->VertexAttrib3fvNV = r200_fallback_VertexAttrib3fvNV;
    vfmt->VertexAttrib4fNV  = r200_fallback_VertexAttrib4fNV;
    vfmt->VertexAttrib4fvNV = r200_fallback_VertexAttrib4fvNV;
-
+   vfmt->FogCoordfEXT = r200_fallback_FogCoordfEXT;
+   vfmt->FogCoordfvEXT = r200_fallback_FogCoordfvEXT;
+   
    (void)r200_fallback_vtxfmt;
 
    TNL_CONTEXT(ctx)->Driver.NotifyBegin = r200NotifyBegin;
@@ -1133,6 +1158,8 @@ void r200VtxfmtInit( GLcontext *ctx, GLboolean useCodegen )
    make_empty_list( &rmesa->vb.dfn_cache.MultiTexCoord2fvARB );
    make_empty_list( &rmesa->vb.dfn_cache.MultiTexCoord1fARB );
    make_empty_list( &rmesa->vb.dfn_cache.MultiTexCoord1fvARB );
+/*   make_empty_list( &rmesa->vb.dfn_cache.FogCoordfEXT );
+   make_empty_list( &rmesa->vb.dfn_cache.FogCoordfvEXT );*/
 
    r200InitCodegen( &rmesa->vb.codegen, useCodegen );
 }
@@ -1192,5 +1219,7 @@ void r200VtxfmtDestroy( GLcontext *ctx )
    free_funcs( &rmesa->vb.dfn_cache.MultiTexCoord2fvARB );
    free_funcs( &rmesa->vb.dfn_cache.MultiTexCoord1fARB );
    free_funcs( &rmesa->vb.dfn_cache.MultiTexCoord1fvARB );
+/*   free_funcs( &rmesa->vb.dfn_cache.FogCoordfEXT );
+   free_funcs( &rmesa->vb.dfn_cache.FogCoordfvEXT );*/
 }
 
diff --git a/src/mesa/drivers/dri/r200/r200_vtxfmt_c.c b/src/mesa/drivers/dri/r200/r200_vtxfmt_c.c
index 70301afb04..670a2fb05a 100644
--- a/src/mesa/drivers/dri/r200/r200_vtxfmt_c.c
+++ b/src/mesa/drivers/dri/r200/r200_vtxfmt_c.c
@@ -42,6 +42,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "vtxfmt.h"
 
 #include "r200_vtxfmt.h"
+#include "r200_tcl.h"
 
 /* Fallback versions of all the entrypoints for situations where
  * codegen isn't available.  This is still a lot faster than the
@@ -512,6 +513,27 @@ static void r200_Normal3fv( const GLfloat *v )
 }
 
 
+/* FogCoord
+ */
+static void r200_FogCoordfEXT( GLfloat f )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);
+   GLfloat *dest = rmesa->vb.fogptr;
+   dest[0] = r200ComputeFogBlendFactor( ctx, f );
+/*   ctx->Current.Attrib[VERT_ATTRIB_FOG][0] = f;*/
+}
+
+static void r200_FogCoordfvEXT( const GLfloat *v )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   r200ContextPtr rmesa = R200_CONTEXT(ctx);
+   GLfloat *dest = rmesa->vb.fogptr;
+   dest[0] = r200ComputeFogBlendFactor( ctx, v[0] );
+/*   ctx->Current.Attrib[VERT_ATTRIB_FOG][0] = v[0];*/
+}
+
+
 /* TexCoord
  */
 
@@ -778,7 +800,8 @@ static void choose_##FN ARGS1						\
  */
 #define MASK_XYZW  (R200_VTX_W0|R200_VTX_Z0)
 #define MASK_NORM  (MASK_XYZW|R200_VTX_N0)
-#define MASK_COLOR (MASK_NORM |(R200_VTX_COLOR_MASK<<R200_VTX_COLOR_0_SHIFT))
+#define MASK_FOG   (MASK_NORM |R200_VTX_DISCRETE_FOG)
+#define MASK_COLOR (MASK_FOG |(R200_VTX_COLOR_MASK<<R200_VTX_COLOR_0_SHIFT))
 #define MASK_SPEC  (MASK_COLOR|(R200_VTX_COLOR_MASK<<R200_VTX_COLOR_1_SHIFT))
 
 /* VTXFMT_1
@@ -871,6 +894,10 @@ CHOOSE(Vertex2f, p2f, ~0, ~0,
 CHOOSE(Vertex2fv, pfv, ~0, ~0, 
        (const GLfloat *v), (v))
 
+CHOOSE(FogCoordfEXT, p1f, MASK_FOG, ~0, 
+       (GLfloat f), (f))
+CHOOSE(FogCoordfvEXT, pfv, MASK_FOG, ~0, 
+       (const GLfloat *f), (f))
 
 
 
@@ -901,6 +928,8 @@ void r200VtxfmtInitChoosers( GLvertexformat *vfmt )
    vfmt->Vertex2fv = choose_Vertex2fv;
    vfmt->Vertex3f = choose_Vertex3f;
    vfmt->Vertex3fv = choose_Vertex3fv;
+/*   vfmt->FogCoordfEXT = choose_FogCoordfEXT;
+   vfmt->FogCoordfvEXT = choose_FogCoordfvEXT;*/
 
    /* TODO: restore ubyte colors to vtxfmt.
     */
@@ -943,6 +972,8 @@ void r200InitCodegen( struct dfn_generators *gen, GLboolean useCodegen )
    gen->MultiTexCoord2fvARB = codegen_noop;
    gen->MultiTexCoord1fARB = codegen_noop;
    gen->MultiTexCoord1fvARB = codegen_noop;
+/*   gen->FogCoordfEXT = codegen_noop;
+   gen->FogCoordfvEXT = codegen_noop;*/
 
    gen->Vertex2f = codegen_noop;
    gen->Vertex2fv = codegen_noop;