added GL_EXT_stencil_two_side (yes, it works)

src/mesa/drivers/glide/fxdd.c

    _mesa_enable_extension(ctx, "GL_EXT_blend_func_separate");
    _mesa_enable_extension(ctx, "GL_EXT_texture_env_add");
    _mesa_enable_extension(ctx, "GL_EXT_stencil_wrap");
+   _mesa_enable_extension(ctx, "GL_EXT_stencil_two_side");
 
    if (fxMesa->haveTwoTMUs) {
       _mesa_enable_extension(ctx, "GL_ARB_multitexture");

src/mesa/drivers/glide/fxdrv.h

 
    tfxUnitsState unitsState;
    tfxUnitsState restoreUnitsState;	/* saved during multipass */
-
+   GLboolean multipass;			/* true when drawing intermediate pass */
 
    GLuint new_state;
    GLuint new_gl_state;
 void fxSetupDepthTest (GLcontext *ctx);
 void fxSetupTexture (GLcontext *ctx);
 void fxSetupStencil (GLcontext *ctx);
+void fxSetupStencilFace (GLcontext *ctx, GLint face);
 
 /* Flags for software fallback cases */
 #define FX_FALLBACK_TEXTURE_MAP		0x0001

src/mesa/drivers/glide/fxsetup.c

    fxMesaContext fxMesa = FX_CONTEXT(ctx);
    tfxUnitsState *us = &fxMesa->unitsState;
 
+   if (ctx->Stencil.ActiveFace) {
+      return;
+   }
+
    if (
        (us->stencilFunction != func)
        ||
    fxMesaContext fxMesa = FX_CONTEXT(ctx);
    tfxUnitsState *us = &fxMesa->unitsState;
 
+   if (ctx->Stencil.ActiveFace) {
+      return;
+   }
+
    if (us->stencilWriteMask != mask) {
       us->stencilWriteMask = mask;
       fxMesa->new_state |= FX_NEW_STENCIL;
    fxMesaContext fxMesa = FX_CONTEXT(ctx);
    tfxUnitsState *us = &fxMesa->unitsState;
 
+   if (ctx->Stencil.ActiveFace) {
+      return;
+   }
+
    if (
        (us->stencilFailFunc != sfail)
        ||
    tfxUnitsState *us = &fxMesa->unitsState;
 
    if (us->stencilEnabled) {
+      GrCmpFnc_t stencilFailFunc = GR_STENCILOP_KEEP;
+      GrCmpFnc_t stencilZFailFunc = GR_STENCILOP_KEEP;
+      GrCmpFnc_t stencilZPassFunc = GR_STENCILOP_KEEP;
+      if (!fxMesa->multipass) {
+         stencilFailFunc = convertGLStencilOp(us->stencilFailFunc);
+         stencilZFailFunc = convertGLStencilOp(us->stencilZFailFunc);
+         stencilZPassFunc = convertGLStencilOp(us->stencilZPassFunc);
+      }
       grEnable(GR_STENCIL_MODE_EXT);
-      fxMesa->Glide.grStencilOpExt(convertGLStencilOp(us->stencilFailFunc),
-                                   convertGLStencilOp(us->stencilZFailFunc),
-                                   convertGLStencilOp(us->stencilZPassFunc));
+      fxMesa->Glide.grStencilOpExt(stencilFailFunc,
+                                   stencilZFailFunc,
+                                   stencilZPassFunc);
       fxMesa->Glide.grStencilFuncExt(us->stencilFunction - GL_NEVER + GR_CMP_NEVER,
                                      us->stencilRefValue,
                                      us->stencilValueMask);
    }
 }
 
+void
+fxSetupStencilFace (GLcontext * ctx, GLint face)
+{
+   fxMesaContext fxMesa = FX_CONTEXT(ctx);
+   tfxUnitsState *us = &fxMesa->unitsState;
+
+   if (us->stencilEnabled) {
+      GrCmpFnc_t stencilFailFunc = GR_STENCILOP_KEEP;
+      GrCmpFnc_t stencilZFailFunc = GR_STENCILOP_KEEP;
+      GrCmpFnc_t stencilZPassFunc = GR_STENCILOP_KEEP;
+      if (!fxMesa->multipass) {
+         stencilFailFunc = convertGLStencilOp(ctx->Stencil.FailFunc[face]);
+         stencilZFailFunc = convertGLStencilOp(ctx->Stencil.ZFailFunc[face]);
+         stencilZPassFunc = convertGLStencilOp(ctx->Stencil.ZPassFunc[face]);
+      }
+      grEnable(GR_STENCIL_MODE_EXT);
+      fxMesa->Glide.grStencilOpExt(stencilFailFunc,
+                                   stencilZFailFunc,
+                                   stencilZPassFunc);
+      fxMesa->Glide.grStencilFuncExt(ctx->Stencil.Function[face] - GL_NEVER + GR_CMP_NEVER,
+                                     ctx->Stencil.Ref[face],
+                                     ctx->Stencil.ValueMask[face]);
+      fxMesa->Glide.grStencilMaskExt(ctx->Stencil.WriteMask[face]);
+   } else {
+      grDisable(GR_STENCIL_MODE_EXT);
+   }
+}
+
 /************************************************************************/
 /**************************** Color Mask SetUp **************************/
 /************************************************************************/

src/mesa/drivers/glide/fxtris.c

 #define FX_OFFSET_BIT	   0x2
 #define FX_TWOSIDE_BIT     0x4
 #define FX_FLAT_BIT        0x8
-#define FX_FALLBACK_BIT    0x10
-#define FX_MAX_TRIFUNC     0x20
+#define FX_TWOSTENCIL_BIT  0x10
+#define FX_FALLBACK_BIT    0x20
+#define FX_MAX_TRIFUNC     0x40
 
 static struct {
    tnl_points_func	points;
 #define DO_UNFILLED (IND & FX_UNFILLED_BIT)
 #define DO_TWOSIDE  (IND & FX_TWOSIDE_BIT)
 #define DO_FLAT     (IND & FX_FLAT_BIT)
+#define DO_TWOSTENCIL (IND & FX_TWOSTENCIL_BIT)
 #define DO_TRI       1
 #define DO_QUAD      1
 #define DO_LINE      1
 #endif /* !FX_PACKEDCOLOR */
 
 
+/***********************************************************************
+ *            Twoside stencil                                          *
+ ***********************************************************************/
+#define SETUP_STENCIL(f) if (f) fxSetupStencilFace(ctx, f)
+#define UNSET_STENCIL(f) if (f) fxSetupStencil(ctx)
+
 
 /***********************************************************************
  *            Functions to draw basic unfilled primitives              *
 #include "tnl_dd/t_dd_tritmp.h"
 
 
+/* 2-sided stencil begin */
+#define IND (FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_UNFILLED_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_unfilled_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_UNFILLED_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_unfilled_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_UNFILLED_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_unfilled_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_UNFILLED_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_unfilled_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_UNFILLED_BIT|FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_unfilled_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_UNFILLED_BIT|FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_unfilled_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_UNFILLED_BIT|FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_unfilled_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_UNFILLED_BIT| \
+	     FX_FALLBACK_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_unfilled_fallback_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+
+/* Fx doesn't support provoking-vertex flat-shading?
+ */
+#define IND (FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_UNFILLED_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_unfilled_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_UNFILLED_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_unfilled_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_UNFILLED_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_unfilled_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_UNFILLED_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_unfilled_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_UNFILLED_BIT|FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_unfilled_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_OFFSET_BIT|FX_UNFILLED_BIT|FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_offset_unfilled_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_UNFILLED_BIT|FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_unfilled_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+
+#define IND (FX_TWOSIDE_BIT|FX_OFFSET_BIT|FX_UNFILLED_BIT| \
+	     FX_FALLBACK_BIT|FX_FLAT_BIT|FX_TWOSTENCIL_BIT)
+#define TAG(x) x##_twoside_offset_unfilled_fallback_flat_twostencil
+#include "tnl_dd/t_dd_tritmp.h"
+/* 2-sided stencil end */
+
+
 static void init_rast_tab( void )
 {
    init();
    init_offset_unfilled_fallback_flat();
    init_twoside_unfilled_fallback_flat();
    init_twoside_offset_unfilled_fallback_flat();
+
+   /* 2-sided stencil begin */
+   init_twostencil();
+   init_offset_twostencil();
+   init_twoside_twostencil();
+   init_twoside_offset_twostencil();
+   init_unfilled_twostencil();
+   init_offset_unfilled_twostencil();
+   init_twoside_unfilled_twostencil();
+   init_twoside_offset_unfilled_twostencil();
+   init_fallback_twostencil();
+   init_offset_fallback_twostencil();
+   init_twoside_fallback_twostencil();
+   init_twoside_offset_fallback_twostencil();
+   init_unfilled_fallback_twostencil();
+   init_offset_unfilled_fallback_twostencil();
+   init_twoside_unfilled_fallback_twostencil();
+   init_twoside_offset_unfilled_fallback_twostencil();
+
+   init_flat_twostencil();
+   init_offset_flat_twostencil();
+   init_twoside_flat_twostencil();
+   init_twoside_offset_flat_twostencil();
+   init_unfilled_flat_twostencil();
+   init_offset_unfilled_flat_twostencil();
+   init_twoside_unfilled_flat_twostencil();
+   init_twoside_offset_unfilled_flat_twostencil();
+   init_fallback_flat_twostencil();
+   init_offset_fallback_flat_twostencil();
+   init_twoside_fallback_flat_twostencil();
+   init_twoside_offset_fallback_flat_twostencil();
+   init_unfilled_fallback_flat_twostencil();
+   init_offset_unfilled_fallback_flat_twostencil();
+   init_twoside_unfilled_fallback_flat_twostencil();
+   init_twoside_offset_unfilled_fallback_flat_twostencil();
+   /* 2-sided stencil end */
 }
 
 
 #define TRI_FALLBACK (DD_TRI_SMOOTH | DD_TRI_STIPPLE)
 #define ANY_FALLBACK_FLAGS (POINT_FALLBACK | LINE_FALLBACK | TRI_FALLBACK)
 #define ANY_RASTER_FLAGS (DD_FLATSHADE | DD_TRI_LIGHT_TWOSIDE | DD_TRI_OFFSET \
-			  | DD_TRI_UNFILLED)
+			  | DD_TRI_UNFILLED | DD_TRI_TWOSTENCIL)
 
 
 
 
    if (flags & (ANY_FALLBACK_FLAGS|ANY_RASTER_FLAGS)) {
       if (flags & ANY_RASTER_FLAGS) {
+	 if (flags & DD_TRI_TWOSTENCIL)       index |= FX_TWOSTENCIL_BIT;
 	 if (flags & DD_TRI_LIGHT_TWOSIDE)    index |= FX_TWOSIDE_BIT;
 	 if (flags & DD_TRI_OFFSET)	      index |= FX_OFFSET_BIT;
 	 if (flags & DD_TRI_UNFILLED)	      index |= FX_UNFILLED_BIT;
             fprintf(stderr, "Voodoo ! leave SW 0x%08x %s\n", oldfallback, getFallbackString(oldfallback));
          }
       }
-      tnl->Driver.Render.Multipass = (HAVE_SPEC && NEED_SECONDARY_COLOR(ctx)) ? fxMultipass_ColorSum : NULL;
+      tnl->Driver.Render.Multipass = NULL;
+      if (HAVE_SPEC && NEED_SECONDARY_COLOR(ctx)) {
+         tnl->Driver.Render.Multipass = fxMultipass_ColorSum;
+         /* obey stencil, but do not change it */
+         fxMesa->multipass = GL_TRUE;
+         if (fxMesa->unitsState.stencilEnabled) {
+            fxMesa->new_state |= FX_NEW_STENCIL;
+         }
+      }
    }
 }
 
 
 /* [dBorca] Hack alert:
  * doesn't work with blending.
- * XXX todo - need to take care of stencil.
  */
 GLboolean fxMultipass_ColorSum (GLcontext *ctx, GLuint pass)
 {
  fxMesaContext fxMesa = FX_CONTEXT(ctx);
+ tfxUnitsState *us = &fxMesa->unitsState;
 
  static int t0 = 0;
  static int t1 = 0;
 
  switch (pass) {
         case 1: /* first pass: the TEXTURED triangles are drawn */
+             /* set stencil's real values */
+             fxMesa->multipass = GL_FALSE;
+             if (us->stencilEnabled) {
+                fxSetupStencil(ctx);
+             }
              /* save per-pass data */
-             fxMesa->restoreUnitsState = fxMesa->unitsState;
+             fxMesa->restoreUnitsState = *us;
              /* turn off texturing */
              t0 = ctx->Texture.Unit[0]._ReallyEnabled;
              t1 = ctx->Texture.Unit[1]._ReallyEnabled;
              fxDDBlendFuncSeparate(ctx, GL_ONE, GL_ONE, GL_ZERO, GL_ONE);
              fxDDEnable(ctx, GL_BLEND, GL_TRUE);
              /* make sure we draw only where we want to */
-             if (ctx->Depth.Mask) {
-                switch (ctx->Depth.Func) {
-                       case GL_NEVER:
-                       case GL_ALWAYS:
-                       break;
-                default:
-                       fxDDDepthFunc( ctx, GL_EQUAL );
-                       break;
+             if (us->depthTestEnabled) {
+                switch (us->depthTestFunc) {
+                   default:
+                      fxDDDepthFunc(ctx, GL_EQUAL);
+                   case GL_NEVER:
+                   case GL_ALWAYS:
+                      ;
                 }
-                fxDDDepthMask( ctx, GL_FALSE );
+                fxDDDepthMask(ctx, GL_FALSE);
              }
              /* switch to secondary colors */
 #if FX_PACKEDCOLOR
              break;
         case 2: /* 2nd pass (last): the secondary color is summed over texture */
              /* restore original state */
-             fxMesa->unitsState = fxMesa->restoreUnitsState;
+             *us = fxMesa->restoreUnitsState;
              /* restore texturing */
              ctx->Texture.Unit[0]._ReallyEnabled = t0;
              ctx->Texture.Unit[1]._ReallyEnabled = t1;