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diff --git a/src/mesa/main/clip.c b/src/mesa/main/clip.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.3
+ *
+ * Copyright (C) 1999-2005 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * 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.
+ */
+
+
+#include "glheader.h"
+#include "clip.h"
+#include "context.h"
+#include "macros.h"
+#include "mtypes.h"
+
+#include "math/m_xform.h"
+#include "math/m_matrix.h"
+
+
+
+/**********************************************************************/
+/* Get/Set User clip-planes. */
+/**********************************************************************/
+
+
+
+void GLAPIENTRY
+_mesa_ClipPlane( GLenum plane, const GLdouble *eq )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLint p;
+ GLfloat equation[4];
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
+ if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
+ return;
+ }
+
+ equation[0] = (GLfloat) eq[0];
+ equation[1] = (GLfloat) eq[1];
+ equation[2] = (GLfloat) eq[2];
+ equation[3] = (GLfloat) eq[3];
+
+ /*
+ * The equation is transformed by the transpose of the inverse of the
+ * current modelview matrix and stored in the resulting eye coordinates.
+ *
+ * KW: Eqn is then transformed to the current clip space, where user
+ * clipping now takes place. The clip-space equations are recalculated
+ * whenever the projection matrix changes.
+ */
+ if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
+ _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
+
+ _mesa_transform_vector( equation, equation,
+ ctx->ModelviewMatrixStack.Top->inv );
+
+ if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation))
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+ COPY_4FV(ctx->Transform.EyeUserPlane[p], equation);
+
+ /* Update derived state. This state also depends on the projection
+ * matrix, and is recalculated on changes to the projection matrix by
+ * code in _mesa_update_state().
+ */
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
+ _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
+
+ _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
+ ctx->Transform.EyeUserPlane[p],
+ ctx->ProjectionMatrixStack.Top->inv );
+ }
+
+ if (ctx->Driver.ClipPlane)
+ ctx->Driver.ClipPlane( ctx, plane, equation );
+}
+
+
+void GLAPIENTRY
+_mesa_GetClipPlane( GLenum plane, GLdouble *equation )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLint p;
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ p = (GLint) (plane - GL_CLIP_PLANE0);
+ if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
+ return;
+ }
+
+ equation[0] = (GLdouble) ctx->Transform.EyeUserPlane[p][0];
+ equation[1] = (GLdouble) ctx->Transform.EyeUserPlane[p][1];
+ equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2];
+ equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3];
+}
+
+void GLAPIENTRY
+_mesa_CullParameterfvEXT (GLenum cap, GLfloat *v)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ switch (cap) {
+ case GL_CULL_VERTEX_EYE_POSITION_EXT:
+ FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+ COPY_4FV(ctx->Transform.CullEyePos, v);
+
+ _mesa_transform_vector( ctx->Transform.CullObjPos,
+ ctx->Transform.CullEyePos,
+ ctx->ModelviewMatrixStack.Top->inv );
+ break;
+
+ case GL_CULL_VERTEX_OBJECT_POSITION_EXT:
+ FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+ COPY_4FV(ctx->Transform.CullObjPos, v);
+
+ _mesa_transform_vector( ctx->Transform.CullEyePos,
+ ctx->Transform.CullObjPos,
+ ctx->ModelviewMatrixStack.Top->m );
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glCullParameterfvEXT" );
+ }
+}
+
+void GLAPIENTRY
+_mesa_CullParameterdvEXT (GLenum cap, GLdouble *v)
+{
+ GLfloat f[4];
+
+ f[0] = (GLfloat)v[0];
+ f[1] = (GLfloat)v[1];
+ f[2] = (GLfloat)v[2];
+ f[3] = (GLfloat)v[3];
+
+ _mesa_CullParameterfvEXT(cap, f);
+}
+