X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fmain%2Fstencil.c;h=604167ae2d7ff325990ba224649f566dbda49bf9;hb=11929895332213363628d632f7f9f6d79b5124d1;hp=b6afd660e6cc60576990ad418e6be6e4cd5fd9f8;hpb=3c63452e64df7e10aa073c6c3b9492b1d7dabbb8;p=mesa.git

diff --git a/src/mesa/main/stencil.c b/src/mesa/main/stencil.c
index b6afd660e6c..604167ae2d7 100644
--- a/src/mesa/main/stencil.c
+++ b/src/mesa/main/stencil.c
@@ -1,10 +1,7 @@
-/* $Id: stencil.c,v 1.29 2002/10/24 23:57:21 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
- * Version:  4.1
  *
- * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2007  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"),
@@ -19,196 +16,653 @@
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/**
+ * \file stencil.c
+ * Stencil operations.
+ *
+ * Note: There's some conflict between GL_EXT_stencil_two_side and
+ * OpenGL 2.0's two-sided stencil feature.
+ *
+ * With GL_EXT_stencil_two_side, calling glStencilOp/Func/Mask() only the
+ * front OR back face state (as set by glActiveStencilFaceEXT) is set.
+ *
+ * But with OpenGL 2.0, calling glStencilOp/Func/Mask() sets BOTH the
+ * front AND back state.
+ *
+ * Also, note that GL_ATI_separate_stencil is different as well:
+ * glStencilFuncSeparateATI(GLenum frontfunc, GLenum backfunc, ...)  vs.
+ * glStencilFuncSeparate(GLenum face, GLenum func, ...).
+ *
+ * This problem is solved by keeping three sets of stencil state:
+ *  state[0] = GL_FRONT state.
+ *  state[1] = OpenGL 2.0 / GL_ATI_separate_stencil GL_BACK state.
+ *  state[2] = GL_EXT_stencil_two_side GL_BACK state.
  */
 
 
 #include "glheader.h"
-#include "imports.h"
+
 #include "context.h"
-#include "depth.h"
 #include "macros.h"
 #include "stencil.h"
 #include "mtypes.h"
-#include "enable.h"
 
 
-void
+static GLboolean
+validate_stencil_op(struct gl_context *ctx, GLenum op)
+{
+   switch (op) {
+   case GL_KEEP:
+   case GL_ZERO:
+   case GL_REPLACE:
+   case GL_INCR:
+   case GL_DECR:
+   case GL_INVERT:
+   case GL_INCR_WRAP:
+   case GL_DECR_WRAP:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+static GLboolean
+validate_stencil_func(struct gl_context *ctx, GLenum func)
+{
+   switch (func) {
+   case GL_NEVER:
+   case GL_LESS:
+   case GL_LEQUAL:
+   case GL_GREATER:
+   case GL_GEQUAL:
+   case GL_EQUAL:
+   case GL_NOTEQUAL:
+   case GL_ALWAYS:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+/**
+ * Set the clear value for the stencil buffer.
+ *
+ * \param s clear value.
+ *
+ * \sa glClearStencil().
+ *
+ * Updates gl_stencil_attrib::Clear. On change
+ * flushes the vertices and notifies the driver via
+ * the dd_function_table::ClearStencil callback.
+ */
+void GLAPIENTRY
 _mesa_ClearStencil( GLint s )
 {
    GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
 
-   if (ctx->Stencil.Clear == (GLstencil) s)
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glClearStencil(%d)\n", s);
+
+   ctx->Stencil.Clear = (GLuint) s;
+}
+
+
+/**
+ * Set the function and reference value for stencil testing.
+ *
+ * \param frontfunc front test function.
+ * \param backfunc back test function.
+ * \param ref front and back reference value.
+ * \param mask front and back bitmask.
+ *
+ * \sa glStencilFunc().
+ *
+ * Verifies the parameters and updates the respective values in
+ * __struct gl_contextRec::Stencil. On change flushes the vertices and notifies
+ * the driver via the dd_function_table::StencilFunc callback.
+ */
+void GLAPIENTRY
+_mesa_StencilFuncSeparateATI( GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask )
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilFuncSeparateATI()\n");
+
+   if (!validate_stencil_func(ctx, frontfunc)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "glStencilFuncSeparateATI(frontfunc)");
       return;
+   }
+   if (!validate_stencil_func(ctx, backfunc)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "glStencilFuncSeparateATI(backfunc)");
+      return;
+   }
+
+   /* set both front and back state */
+   if (ctx->Stencil.Function[0] == frontfunc &&
+       ctx->Stencil.Function[1] == backfunc &&
+       ctx->Stencil.ValueMask[0] == mask &&
+       ctx->Stencil.ValueMask[1] == mask &&
+       ctx->Stencil.Ref[0] == ref &&
+       ctx->Stencil.Ref[1] == ref)
+      return;
+   FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+   ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+   ctx->Stencil.Function[0]  = frontfunc;
+   ctx->Stencil.Function[1]  = backfunc;
+   ctx->Stencil.Ref[0]       = ctx->Stencil.Ref[1]       = ref;
+   ctx->Stencil.ValueMask[0] = ctx->Stencil.ValueMask[1] = mask;
+   if (ctx->Driver.StencilFuncSeparate) {
+      ctx->Driver.StencilFuncSeparate(ctx, GL_FRONT,
+                                      frontfunc, ref, mask);
+      ctx->Driver.StencilFuncSeparate(ctx, GL_BACK,
+                                      backfunc, ref, mask);
+   }
+}
 
-   FLUSH_VERTICES(ctx, _NEW_STENCIL);
-   ctx->Stencil.Clear = (GLstencil) s;
 
-   if (ctx->Driver.ClearStencil) {
-      (*ctx->Driver.ClearStencil)( ctx, s );
+/**
+ * Set the function and reference value for stencil testing.
+ *
+ * \param func test function.
+ * \param ref reference value.
+ * \param mask bitmask.
+ *
+ * \sa glStencilFunc().
+ *
+ * Verifies the parameters and updates the respective values in
+ * __struct gl_contextRec::Stencil. On change flushes the vertices and notifies
+ * the driver via the dd_function_table::StencilFunc callback.
+ */
+static void
+stencil_func(struct gl_context *ctx, GLenum func, GLint ref, GLuint mask)
+{
+   const GLint face = ctx->Stencil.ActiveFace;
+
+   if (face != 0) {
+      if (ctx->Stencil.Function[face] == func &&
+          ctx->Stencil.ValueMask[face] == mask &&
+          ctx->Stencil.Ref[face] == ref)
+         return;
+      FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+      ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+      ctx->Stencil.Function[face] = func;
+      ctx->Stencil.Ref[face] = ref;
+      ctx->Stencil.ValueMask[face] = mask;
+
+      /* Only propagate the change to the driver if EXT_stencil_two_side
+       * is enabled.
+       */
+      if (ctx->Driver.StencilFuncSeparate && ctx->Stencil.TestTwoSide) {
+         ctx->Driver.StencilFuncSeparate(ctx, GL_BACK, func, ref, mask);
+      }
+   }
+   else {
+      /* set both front and back state */
+      if (ctx->Stencil.Function[0] == func &&
+          ctx->Stencil.Function[1] == func &&
+          ctx->Stencil.ValueMask[0] == mask &&
+          ctx->Stencil.ValueMask[1] == mask &&
+          ctx->Stencil.Ref[0] == ref &&
+          ctx->Stencil.Ref[1] == ref)
+         return;
+      FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+      ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+      ctx->Stencil.Function[0]  = ctx->Stencil.Function[1]  = func;
+      ctx->Stencil.Ref[0]       = ctx->Stencil.Ref[1]       = ref;
+      ctx->Stencil.ValueMask[0] = ctx->Stencil.ValueMask[1] = mask;
+      if (ctx->Driver.StencilFuncSeparate) {
+         ctx->Driver.StencilFuncSeparate(ctx,
+					 ((ctx->Stencil.TestTwoSide)
+					  ? GL_FRONT : GL_FRONT_AND_BACK),
+                                         func, ref, mask);
+      }
    }
 }
 
 
+void GLAPIENTRY
+_mesa_StencilFunc_no_error(GLenum func, GLint ref, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   stencil_func(ctx, func, ref, mask);
+}
 
-void
-_mesa_StencilFunc( GLenum func, GLint ref, GLuint mask )
+
+void GLAPIENTRY
+_mesa_StencilFunc(GLenum func, GLint ref, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilFunc()\n");
+
+   if (!validate_stencil_func(ctx, func)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFunc(func)");
+      return;
+   }
+
+   stencil_func(ctx, func, ref, mask);
+}
+
+
+/**
+ * Set the stencil writing mask.
+ *
+ * \param mask bit-mask to enable/disable writing of individual bits in the
+ * stencil planes.
+ *
+ * \sa glStencilMask().
+ *
+ * Updates gl_stencil_attrib::WriteMask. On change flushes the vertices and
+ * notifies the driver via the dd_function_table::StencilMask callback.
+ */
+void GLAPIENTRY
+_mesa_StencilMask( GLuint mask )
 {
    GET_CURRENT_CONTEXT(ctx);
    const GLint face = ctx->Stencil.ActiveFace;
-   GLint maxref;
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
 
-   switch (func) {
-      case GL_NEVER:
-      case GL_LESS:
-      case GL_LEQUAL:
-      case GL_GREATER:
-      case GL_GEQUAL:
-      case GL_EQUAL:
-      case GL_NOTEQUAL:
-      case GL_ALWAYS:
-         break;
-      default:
-         _mesa_error( ctx, GL_INVALID_ENUM, "glStencilFunc" );
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilMask()\n");
+
+   if (face != 0) {
+      /* Only modify the EXT_stencil_two_side back-face state.
+       */
+      if (ctx->Stencil.WriteMask[face] == mask)
+         return;
+      FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+      ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+      ctx->Stencil.WriteMask[face] = mask;
+
+      /* Only propagate the change to the driver if EXT_stencil_two_side
+       * is enabled.
+       */
+      if (ctx->Driver.StencilMaskSeparate && ctx->Stencil.TestTwoSide) {
+         ctx->Driver.StencilMaskSeparate(ctx, GL_BACK, mask);
+      }
+   }
+   else {
+      /* set both front and back state */
+      if (ctx->Stencil.WriteMask[0] == mask &&
+          ctx->Stencil.WriteMask[1] == mask)
+         return;
+      FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+      ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+      ctx->Stencil.WriteMask[0] = ctx->Stencil.WriteMask[1] = mask;
+      if (ctx->Driver.StencilMaskSeparate) {
+         ctx->Driver.StencilMaskSeparate(ctx,
+					 ((ctx->Stencil.TestTwoSide)
+					  ? GL_FRONT : GL_FRONT_AND_BACK),
+					  mask);
+      }
+   }
+}
+
+
+/**
+ * Set the stencil test actions.
+ *
+ * \param fail action to take when stencil test fails.
+ * \param zfail action to take when stencil test passes, but depth test fails.
+ * \param zpass action to take when stencil test passes and the depth test
+ * passes (or depth testing is not enabled).
+ *
+ * \sa glStencilOp().
+ *
+ * Verifies the parameters and updates the respective fields in
+ * __struct gl_contextRec::Stencil. On change flushes the vertices and notifies
+ * the driver via the dd_function_table::StencilOp callback.
+ */
+static void
+stencil_op(struct gl_context *ctx, GLenum fail, GLenum zfail, GLenum zpass)
+{
+   const GLint face = ctx->Stencil.ActiveFace;
+
+   if (face != 0) {
+      /* only set active face state */
+      if (ctx->Stencil.ZFailFunc[face] == zfail &&
+          ctx->Stencil.ZPassFunc[face] == zpass &&
+          ctx->Stencil.FailFunc[face] == fail)
+         return;
+      FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+      ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+      ctx->Stencil.ZFailFunc[face] = zfail;
+      ctx->Stencil.ZPassFunc[face] = zpass;
+      ctx->Stencil.FailFunc[face] = fail;
+
+      /* Only propagate the change to the driver if EXT_stencil_two_side
+       * is enabled.
+       */
+      if (ctx->Driver.StencilOpSeparate && ctx->Stencil.TestTwoSide) {
+         ctx->Driver.StencilOpSeparate(ctx, GL_BACK, fail, zfail, zpass);
+      }
+   }
+   else {
+      /* set both front and back state */
+      if (ctx->Stencil.ZFailFunc[0] == zfail &&
+          ctx->Stencil.ZFailFunc[1] == zfail &&
+          ctx->Stencil.ZPassFunc[0] == zpass &&
+          ctx->Stencil.ZPassFunc[1] == zpass &&
+          ctx->Stencil.FailFunc[0] == fail &&
+          ctx->Stencil.FailFunc[1] == fail)
          return;
+      FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+      ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+      ctx->Stencil.ZFailFunc[0] = ctx->Stencil.ZFailFunc[1] = zfail;
+      ctx->Stencil.ZPassFunc[0] = ctx->Stencil.ZPassFunc[1] = zpass;
+      ctx->Stencil.FailFunc[0]  = ctx->Stencil.FailFunc[1]  = fail;
+      if (ctx->Driver.StencilOpSeparate) {
+         ctx->Driver.StencilOpSeparate(ctx,
+				       ((ctx->Stencil.TestTwoSide)
+					? GL_FRONT : GL_FRONT_AND_BACK),
+                                       fail, zfail, zpass);
+      }
    }
+}
+
+
+void GLAPIENTRY
+_mesa_StencilOp_no_error(GLenum fail, GLenum zfail, GLenum zpass)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   stencil_op(ctx, fail, zfail, zpass);
+}
 
-   maxref = (1 << STENCIL_BITS) - 1;
-   ref = (GLstencil) CLAMP( ref, 0, maxref );
 
-   if (ctx->Stencil.Function[face] == func &&
-       ctx->Stencil.ValueMask[face] == (GLstencil) mask &&
-       ctx->Stencil.Ref[face] == ref)
+void GLAPIENTRY
+_mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilOp()\n");
+
+   if (!validate_stencil_op(ctx, fail)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(sfail)");
       return;
+   }
 
-   FLUSH_VERTICES(ctx, _NEW_STENCIL);
-   ctx->Stencil.Function[face] = func;
-   ctx->Stencil.Ref[face] = ref;
-   ctx->Stencil.ValueMask[face] = (GLstencil) mask;
+   if (!validate_stencil_op(ctx, zfail)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(zfail)");
+      return;
+   }
 
-   if (ctx->Driver.StencilFunc) {
-      (*ctx->Driver.StencilFunc)( ctx, func, ref, mask );
+   if (!validate_stencil_op(ctx, zpass)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp(zpass)");
+      return;
    }
-}
 
+   stencil_op(ctx, fail, zfail, zpass);
+}
 
 
-void
-_mesa_StencilMask( GLuint mask )
+/* GL_EXT_stencil_two_side */
+void GLAPIENTRY
+_mesa_ActiveStencilFaceEXT(GLenum face)
 {
    GET_CURRENT_CONTEXT(ctx);
-   const GLint face = ctx->Stencil.ActiveFace;
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
 
-   if (ctx->Stencil.WriteMask[face] == (GLstencil) mask)
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glActiveStencilFaceEXT()\n");
+
+   if (!ctx->Extensions.EXT_stencil_two_side) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glActiveStencilFaceEXT");
       return;
+   }
+
+   if (face == GL_FRONT || face == GL_BACK) {
+      ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 2;
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glActiveStencilFaceEXT(face)");
+   }
+}
 
-   FLUSH_VERTICES(ctx, _NEW_STENCIL);
-   ctx->Stencil.WriteMask[face] = (GLstencil) mask;
 
-   if (ctx->Driver.StencilMask) {
-      (*ctx->Driver.StencilMask)( ctx, mask );
+static void
+stencil_op_separate(struct gl_context *ctx, GLenum face, GLenum sfail,
+                    GLenum zfail, GLenum zpass)
+{
+   GLboolean set = GL_FALSE;
+
+   if (face != GL_BACK) {
+      /* set front */
+      if (ctx->Stencil.ZFailFunc[0] != zfail ||
+          ctx->Stencil.ZPassFunc[0] != zpass ||
+          ctx->Stencil.FailFunc[0] != sfail){
+         FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+         ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+         ctx->Stencil.ZFailFunc[0] = zfail;
+         ctx->Stencil.ZPassFunc[0] = zpass;
+         ctx->Stencil.FailFunc[0] = sfail;
+         set = GL_TRUE;
+      }
+   }
+
+   if (face != GL_FRONT) {
+      /* set back */
+      if (ctx->Stencil.ZFailFunc[1] != zfail ||
+          ctx->Stencil.ZPassFunc[1] != zpass ||
+          ctx->Stencil.FailFunc[1] != sfail) {
+         FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+         ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+         ctx->Stencil.ZFailFunc[1] = zfail;
+         ctx->Stencil.ZPassFunc[1] = zpass;
+         ctx->Stencil.FailFunc[1] = sfail;
+         set = GL_TRUE;
+      }
+   }
+
+   if (set && ctx->Driver.StencilOpSeparate) {
+      ctx->Driver.StencilOpSeparate(ctx, face, sfail, zfail, zpass);
    }
 }
 
 
+void GLAPIENTRY
+_mesa_StencilOpSeparate_no_error(GLenum face, GLenum sfail, GLenum zfail,
+                                 GLenum zpass)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   stencil_op_separate(ctx, face, sfail, zfail, zpass);
+}
+
 
-void
-_mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass)
+void GLAPIENTRY
+_mesa_StencilOpSeparate(GLenum face, GLenum sfail, GLenum zfail, GLenum zpass)
 {
    GET_CURRENT_CONTEXT(ctx);
-   const GLint face = ctx->Stencil.ActiveFace;
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   switch (fail) {
-      case GL_KEEP:
-      case GL_ZERO:
-      case GL_REPLACE:
-      case GL_INCR:
-      case GL_DECR:
-      case GL_INVERT:
-         break;
-      case GL_INCR_WRAP_EXT:
-      case GL_DECR_WRAP_EXT:
-         if (!ctx->Extensions.EXT_stencil_wrap) {
-            break;
-         }
-         /* FALL-THROUGH */
-      default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
-         return;
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilOpSeparate()\n");
+
+   if (!validate_stencil_op(ctx, sfail)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(sfail)");
+      return;
    }
-   switch (zfail) {
-      case GL_KEEP:
-      case GL_ZERO:
-      case GL_REPLACE:
-      case GL_INCR:
-      case GL_DECR:
-      case GL_INVERT:
-         break;
-      case GL_INCR_WRAP_EXT:
-      case GL_DECR_WRAP_EXT:
-         if (ctx->Extensions.EXT_stencil_wrap) {
-            break;
-         }
-         /* FALL-THROUGH */
-      default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
-         return;
+
+   if (!validate_stencil_op(ctx, zfail)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zfail)");
+      return;
    }
-   switch (zpass) {
-      case GL_KEEP:
-      case GL_ZERO:
-      case GL_REPLACE:
-      case GL_INCR:
-      case GL_DECR:
-      case GL_INVERT:
-         break;
-      case GL_INCR_WRAP_EXT:
-      case GL_DECR_WRAP_EXT:
-         if (ctx->Extensions.EXT_stencil_wrap) {
-            break;
-         }
-         /* FALL-THROUGH */
-      default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOp");
-         return;
+
+   if (!validate_stencil_op(ctx, zpass)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(zpass)");
+      return;
    }
 
-   if (ctx->Stencil.ZFailFunc[face] == zfail &&
-       ctx->Stencil.ZPassFunc[face] == zpass &&
-       ctx->Stencil.FailFunc[face] == fail)
+   if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilOpSeparate(face)");
       return;
+   }
+
+   stencil_op_separate(ctx, face, sfail, zfail, zpass);
+}
+
 
-   FLUSH_VERTICES(ctx, _NEW_STENCIL);
-   ctx->Stencil.ZFailFunc[face] = zfail;
-   ctx->Stencil.ZPassFunc[face] = zpass;
-   ctx->Stencil.FailFunc[face] = fail;
+static void
+stencil_func_separate(struct gl_context *ctx, GLenum face, GLenum func,
+                      GLint ref, GLuint mask)
+{
+   FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+   ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+
+   if (face != GL_BACK) {
+      /* set front */
+      ctx->Stencil.Function[0] = func;
+      ctx->Stencil.Ref[0] = ref;
+      ctx->Stencil.ValueMask[0] = mask;
+   }
+
+   if (face != GL_FRONT) {
+      /* set back */
+      ctx->Stencil.Function[1] = func;
+      ctx->Stencil.Ref[1] = ref;
+      ctx->Stencil.ValueMask[1] = mask;
+   }
 
-   if (ctx->Driver.StencilOp) {
-      (*ctx->Driver.StencilOp)(ctx, fail, zfail, zpass);
+   if (ctx->Driver.StencilFuncSeparate) {
+      ctx->Driver.StencilFuncSeparate(ctx, face, func, ref, mask);
    }
 }
 
 
-/* GL_EXT_stencil_two_side */
-void
-_mesa_ActiveStencilFaceEXT(GLenum face)
+/* OpenGL 2.0 */
+void GLAPIENTRY
+_mesa_StencilFuncSeparate_no_error(GLenum face, GLenum func, GLint ref,
+                                   GLuint mask)
 {
    GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
+   stencil_func_separate(ctx, face, func, ref, mask);
+}
 
-   if (face == GL_FRONT || face == GL_BACK) {
-      FLUSH_VERTICES(ctx, _NEW_STENCIL);
-      ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 1;
+
+void GLAPIENTRY
+_mesa_StencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilFuncSeparate()\n");
+
+   if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(face)");
+      return;
    }
 
-   if (ctx->Driver.ActiveStencilFace) {
-      (*ctx->Driver.ActiveStencilFace)( ctx, (GLuint) ctx->Stencil.ActiveFace );
+   if (!validate_stencil_func(ctx, func)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilFuncSeparate(func)");
+      return;
    }
+
+   stencil_func_separate(ctx, face, func, ref, mask);
 }
 
+
+static void
+stencil_mask_separate(struct gl_context *ctx, GLenum face, GLuint mask)
+{
+   FLUSH_VERTICES(ctx, ctx->DriverFlags.NewStencil ? 0 : _NEW_STENCIL);
+   ctx->NewDriverState |= ctx->DriverFlags.NewStencil;
+
+   if (face != GL_BACK) {
+      ctx->Stencil.WriteMask[0] = mask;
+   }
+
+   if (face != GL_FRONT) {
+      ctx->Stencil.WriteMask[1] = mask;
+   }
+
+   if (ctx->Driver.StencilMaskSeparate) {
+      ctx->Driver.StencilMaskSeparate(ctx, face, mask);
+   }
+}
+
+
+/* OpenGL 2.0 */
+void GLAPIENTRY
+_mesa_StencilMaskSeparate_no_error(GLenum face, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   stencil_mask_separate(ctx, face, mask);
+}
+
+
+void GLAPIENTRY
+_mesa_StencilMaskSeparate(GLenum face, GLuint mask)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glStencilMaskSeparate()\n");
+
+   if (face != GL_FRONT && face != GL_BACK && face != GL_FRONT_AND_BACK) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glStencilaMaskSeparate(face)");
+      return;
+   }
+
+   stencil_mask_separate(ctx, face, mask);
+}
+
+
+/**
+ * Initialize the context stipple state.
+ *
+ * \param ctx GL context.
+ *
+ * Initializes __struct gl_contextRec::Stencil attribute group.
+ */
+void
+_mesa_init_stencil(struct gl_context *ctx)
+{
+   ctx->Stencil.Enabled = GL_FALSE;
+   ctx->Stencil.TestTwoSide = GL_FALSE;
+   ctx->Stencil.ActiveFace = 0;  /* 0 = GL_FRONT, 2 = GL_BACK */
+   ctx->Stencil.Function[0] = GL_ALWAYS;
+   ctx->Stencil.Function[1] = GL_ALWAYS;
+   ctx->Stencil.Function[2] = GL_ALWAYS;
+   ctx->Stencil.FailFunc[0] = GL_KEEP;
+   ctx->Stencil.FailFunc[1] = GL_KEEP;
+   ctx->Stencil.FailFunc[2] = GL_KEEP;
+   ctx->Stencil.ZPassFunc[0] = GL_KEEP;
+   ctx->Stencil.ZPassFunc[1] = GL_KEEP;
+   ctx->Stencil.ZPassFunc[2] = GL_KEEP;
+   ctx->Stencil.ZFailFunc[0] = GL_KEEP;
+   ctx->Stencil.ZFailFunc[1] = GL_KEEP;
+   ctx->Stencil.ZFailFunc[2] = GL_KEEP;
+   ctx->Stencil.Ref[0] = 0;
+   ctx->Stencil.Ref[1] = 0;
+   ctx->Stencil.Ref[2] = 0;
+
+   /* 4.1.4 Stencil Test section of the GL-ES 3.0 specification says:
+    *
+    *     "In the initial state, [...] the front and back stencil mask are both
+    *     set to the value 2^s − 1, where s is greater than or equal to the
+    *     number of bits in the deepest stencil buffer* supported by the GL
+    *     implementation."
+    *
+    * Since the maximum supported precision for stencil buffers is 8 bits,
+    * mask values should be initialized to 2^8 - 1 = 0xFF.
+    */
+   ctx->Stencil.ValueMask[0] = 0xFF;
+   ctx->Stencil.ValueMask[1] = 0xFF;
+   ctx->Stencil.ValueMask[2] = 0xFF;
+   ctx->Stencil.WriteMask[0] = 0xFF;
+   ctx->Stencil.WriteMask[1] = 0xFF;
+   ctx->Stencil.WriteMask[2] = 0xFF;
+
+   ctx->Stencil.Clear = 0;
+   ctx->Stencil._BackFace = 1;
+}