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diff --git a/src/mesa/tnl/t_vb_cliptmp.h b/src/mesa/tnl/t_vb_cliptmp.h
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+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.5
+ *
+ * Copyright (C) 1999-2001 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.
+ *
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+
+#define CLIP_DOTPROD(K, A, B, C, D) X(K)*A + Y(K)*B + Z(K)*C + W(K)*D
+
+#define POLY_CLIP( PLANE, A, B, C, D ) \
+do { \
+ if (mask & PLANE) { \
+ GLuint idxPrev = inlist[0]; \
+ GLfloat dpPrev = CLIP_DOTPROD(idxPrev, A, B, C, D ); \
+ GLuint outcount = 0; \
+ GLuint i; \
+ \
+ inlist[n] = inlist[0]; /* prevent rotation of vertices */ \
+ for (i = 1; i <= n; i++) { \
+ GLuint idx = inlist[i]; \
+ GLfloat dp = CLIP_DOTPROD(idx, A, B, C, D ); \
+ \
+ if (!IS_NEGATIVE(dpPrev)) { \
+ outlist[outcount++] = idxPrev; \
+ } \
+ \
+ if (DIFFERENT_SIGNS(dp, dpPrev)) { \
+ if (IS_NEGATIVE(dp)) { \
+ /* Going out of bounds. Avoid division by zero as we \
+ * know dp != dpPrev from DIFFERENT_SIGNS, above. \
+ */ \
+ GLfloat t = dp / (dp - dpPrev); \
+ INTERP_4F( t, coord[newvert], coord[idx], coord[idxPrev]); \
+ interp( ctx, t, newvert, idx, idxPrev, GL_TRUE ); \
+ } else { \
+ /* Coming back in. \
+ */ \
+ GLfloat t = dpPrev / (dpPrev - dp); \
+ INTERP_4F( t, coord[newvert], coord[idxPrev], coord[idx]); \
+ interp( ctx, t, newvert, idxPrev, idx, GL_FALSE ); \
+ } \
+ outlist[outcount++] = newvert++; \
+ } \
+ \
+ idxPrev = idx; \
+ dpPrev = dp; \
+ } \
+ \
+ if (outcount < 3) \
+ return; \
+ \
+ { \
+ GLuint *tmp = inlist; \
+ inlist = outlist; \
+ outlist = tmp; \
+ n = outcount; \
+ } \
+ } \
+} while (0)
+
+
+#define LINE_CLIP(PLANE, A, B, C, D ) \
+do { \
+ if (mask & PLANE) { \
+ GLfloat dp0 = CLIP_DOTPROD( v0, A, B, C, D ); \
+ GLfloat dp1 = CLIP_DOTPROD( v1, A, B, C, D ); \
+ \
+ /* For regular clipping, we know from the clipmask that one of \
+ * these must be negative (otherwise we wouldn't be here). For \
+ * userclip, there is only a single bit for all active planes, \
+ * so we can end up here when there is nothing to do, hence the \
+ * second IS_NEGATIVE() test: \
+ */ \
+ if (IS_NEGATIVE(dp1)) { \
+ GLfloat t = dp1 / (dp1 - dp0); \
+ if (t > t1) t1 = t; \
+ } else if (IS_NEGATIVE(dp0)) { \
+ GLfloat t = dp0 / (dp0 - dp1); \
+ if (t > t0) t0 = t; \
+ } \
+ \
+ if (t0 + t1 >= 1.0) \
+ return; \
+ } \
+} while (0)
+
+
+
+/* Clip a line against the viewport and user clip planes.
+ */
+static INLINE void
+TAG(clip_line)( GLcontext *ctx, GLuint v0, GLuint v1, GLubyte mask )
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct vertex_buffer *VB = &tnl->vb;
+ tnl_interp_func interp = tnl->Driver.Render.Interp;
+ GLfloat (*coord)[4] = VB->ClipPtr->data;
+ GLuint newvert = VB->Count;
+ GLfloat t0 = 0;
+ GLfloat t1 = 0;
+ GLuint p;
+
+
+ if (mask & 0x3f) {
+ LINE_CLIP( CLIP_RIGHT_BIT, -1, 0, 0, 1 );
+ LINE_CLIP( CLIP_LEFT_BIT, 1, 0, 0, 1 );
+ LINE_CLIP( CLIP_TOP_BIT, 0, -1, 0, 1 );
+ LINE_CLIP( CLIP_BOTTOM_BIT, 0, 1, 0, 1 );
+ LINE_CLIP( CLIP_FAR_BIT, 0, 0, -1, 1 );
+ LINE_CLIP( CLIP_NEAR_BIT, 0, 0, 1, 1 );
+ }
+
+ if (mask & CLIP_USER_BIT) {
+ for (p=0;p<MAX_CLIP_PLANES;p++) {
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ const GLfloat a = ctx->Transform._ClipUserPlane[p][0];
+ const GLfloat b = ctx->Transform._ClipUserPlane[p][1];
+ const GLfloat c = ctx->Transform._ClipUserPlane[p][2];
+ const GLfloat d = ctx->Transform._ClipUserPlane[p][3];
+ LINE_CLIP( CLIP_USER_BIT, a, b, c, d );
+ }
+ }
+ }
+
+ if (VB->ClipMask[v0]) {
+ INTERP_4F( t0, coord[newvert], coord[v0], coord[v1] );
+ interp( ctx, t0, newvert, v0, v1, GL_FALSE );
+ v0 = newvert;
+ newvert++;
+ }
+ else
+ ASSERT(t0 == 0.0);
+
+ if (VB->ClipMask[v1]) {
+ INTERP_4F( t1, coord[newvert], coord[v1], coord[v0] );
+ interp( ctx, t1, newvert, v1, v0, GL_FALSE );
+
+ if (ctx->_TriangleCaps & DD_FLATSHADE)
+ tnl->Driver.Render.CopyPV( ctx, newvert, v1 );
+
+ v1 = newvert;
+ newvert++;
+ }
+ else
+ ASSERT(t1 == 0.0);
+
+ tnl->Driver.Render.ClippedLine( ctx, v0, v1 );
+}
+
+
+/* Clip a triangle against the viewport and user clip planes.
+ */
+static INLINE void
+TAG(clip_tri)( GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLubyte mask )
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct vertex_buffer *VB = &tnl->vb;
+ tnl_interp_func interp = tnl->Driver.Render.Interp;
+ GLuint newvert = VB->Count;
+ GLfloat (*coord)[4] = VB->ClipPtr->data;
+ GLuint pv = v2;
+ GLuint vlist[2][MAX_CLIPPED_VERTICES];
+ GLuint *inlist = vlist[0], *outlist = vlist[1];
+ GLuint p;
+ GLuint n = 3;
+
+ ASSIGN_3V(inlist, v2, v0, v1 ); /* pv rotated to slot zero */
+
+ if (mask & 0x3f) {
+ POLY_CLIP( CLIP_RIGHT_BIT, -1, 0, 0, 1 );
+ POLY_CLIP( CLIP_LEFT_BIT, 1, 0, 0, 1 );
+ POLY_CLIP( CLIP_TOP_BIT, 0, -1, 0, 1 );
+ POLY_CLIP( CLIP_BOTTOM_BIT, 0, 1, 0, 1 );
+ POLY_CLIP( CLIP_FAR_BIT, 0, 0, -1, 1 );
+ POLY_CLIP( CLIP_NEAR_BIT, 0, 0, 1, 1 );
+ }
+
+ if (mask & CLIP_USER_BIT) {
+ for (p=0;p<MAX_CLIP_PLANES;p++) {
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ const GLfloat a = ctx->Transform._ClipUserPlane[p][0];
+ const GLfloat b = ctx->Transform._ClipUserPlane[p][1];
+ const GLfloat c = ctx->Transform._ClipUserPlane[p][2];
+ const GLfloat d = ctx->Transform._ClipUserPlane[p][3];
+ POLY_CLIP( CLIP_USER_BIT, a, b, c, d );
+ }
+ }
+ }
+
+ if (ctx->_TriangleCaps & DD_FLATSHADE) {
+ if (pv != inlist[0]) {
+ ASSERT( inlist[0] >= VB->Count );
+ tnl->Driver.Render.CopyPV( ctx, inlist[0], pv );
+ }
+ }
+
+ tnl->Driver.Render.ClippedPolygon( ctx, inlist, n );
+}
+
+
+/* Clip a quad against the viewport and user clip planes.
+ */
+static INLINE void
+TAG(clip_quad)( GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint v3,
+ GLubyte mask )
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct vertex_buffer *VB = &tnl->vb;
+ tnl_interp_func interp = tnl->Driver.Render.Interp;
+ GLuint newvert = VB->Count;
+ GLfloat (*coord)[4] = VB->ClipPtr->data;
+ GLuint pv = v3;
+ GLuint vlist[2][MAX_CLIPPED_VERTICES];
+ GLuint *inlist = vlist[0], *outlist = vlist[1];
+ GLuint p;
+ GLuint n = 4;
+
+ ASSIGN_4V(inlist, v3, v0, v1, v2 ); /* pv rotated to slot zero */
+
+ if (mask & 0x3f) {
+ POLY_CLIP( CLIP_RIGHT_BIT, -1, 0, 0, 1 );
+ POLY_CLIP( CLIP_LEFT_BIT, 1, 0, 0, 1 );
+ POLY_CLIP( CLIP_TOP_BIT, 0, -1, 0, 1 );
+ POLY_CLIP( CLIP_BOTTOM_BIT, 0, 1, 0, 1 );
+ POLY_CLIP( CLIP_FAR_BIT, 0, 0, -1, 1 );
+ POLY_CLIP( CLIP_NEAR_BIT, 0, 0, 1, 1 );
+ }
+
+ if (mask & CLIP_USER_BIT) {
+ for (p=0;p<MAX_CLIP_PLANES;p++) {
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ const GLfloat a = ctx->Transform._ClipUserPlane[p][0];
+ const GLfloat b = ctx->Transform._ClipUserPlane[p][1];
+ const GLfloat c = ctx->Transform._ClipUserPlane[p][2];
+ const GLfloat d = ctx->Transform._ClipUserPlane[p][3];
+ POLY_CLIP( CLIP_USER_BIT, a, b, c, d );
+ }
+ }
+ }
+
+ if (ctx->_TriangleCaps & DD_FLATSHADE) {
+ if (pv != inlist[0]) {
+ ASSERT( inlist[0] >= VB->Count );
+ tnl->Driver.Render.CopyPV( ctx, inlist[0], pv );
+ }
+ }
+
+ tnl->Driver.Render.ClippedPolygon( ctx, inlist, n );
+}
+
+#undef W
+#undef Z
+#undef Y
+#undef X
+#undef SIZE
+#undef TAG
+#undef POLY_CLIP
+#undef LINE_CLIP
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