From 46b3f976542190dd3c217a46653159f77552764a Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 29 Oct 2002 22:25:57 +0000
Subject: [PATCH] fix culling problem (bug 630649)

---
 src/mesa/swrast_setup/ss_triangle.c | 24 +++++++++++++++++++++---
 src/mesa/swrast_setup/ss_tritmp.h   |  6 +++---
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/src/mesa/swrast_setup/ss_triangle.c b/src/mesa/swrast_setup/ss_triangle.c
index 9633469df1c..d2f140f7ff8 100644
--- a/src/mesa/swrast_setup/ss_triangle.c
+++ b/src/mesa/swrast_setup/ss_triangle.c
@@ -1,4 +1,4 @@
-/* $Id: ss_triangle.c,v 1.19 2002/10/29 20:29:00 brianp Exp $ */
+/* $Id: ss_triangle.c,v 1.20 2002/10/29 22:25:57 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -48,7 +48,8 @@ static quad_func     quad_tab[SS_MAX_TRIFUNC];
 
 
 static void _swsetup_render_line_tri( GLcontext *ctx,
-				      GLuint e0, GLuint e1, GLuint e2 )
+				      GLuint e0, GLuint e1, GLuint e2,
+                                      GLuint facing )
 {
    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
@@ -61,6 +62,14 @@ static void _swsetup_render_line_tri( GLcontext *ctx,
    GLchan s[2][4];
    GLuint i[2];
 
+   /* cull testing */
+   if (ctx->Polygon.CullFlag) {
+      if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
+         return;
+      if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
+         return;
+   }
+
    if (ctx->_TriangleCaps & DD_FLATSHADE) {
       COPY_CHAN4(c[0], v0->color);
       COPY_CHAN4(c[1], v1->color);
@@ -98,7 +107,8 @@ static void _swsetup_render_line_tri( GLcontext *ctx,
 }
 
 static void _swsetup_render_point_tri( GLcontext *ctx,
-				       GLuint e0, GLuint e1, GLuint e2 )
+				       GLuint e0, GLuint e1, GLuint e2,
+                                       GLuint facing )
 {
    SScontext *swsetup = SWSETUP_CONTEXT(ctx);
    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
@@ -111,6 +121,14 @@ static void _swsetup_render_point_tri( GLcontext *ctx,
    GLchan s[2][4];
    GLuint i[2];
 
+   /* cull testing */
+   if (ctx->Polygon.CullFlag) {
+      if (facing == 1 && ctx->Polygon.CullFaceMode != GL_FRONT)
+         return;
+      if (facing == 0 && ctx->Polygon.CullFaceMode != GL_BACK)
+         return;
+   }
+
    if (ctx->_TriangleCaps & DD_FLATSHADE) {
       COPY_CHAN4(c[0], v0->color);
       COPY_CHAN4(c[1], v1->color);
diff --git a/src/mesa/swrast_setup/ss_tritmp.h b/src/mesa/swrast_setup/ss_tritmp.h
index f84e4b91205..4407fc1e1b6 100644
--- a/src/mesa/swrast_setup/ss_tritmp.h
+++ b/src/mesa/swrast_setup/ss_tritmp.h
@@ -1,4 +1,4 @@
-/* $Id: ss_tritmp.h,v 1.18 2002/10/29 20:29:00 brianp Exp $ */
+/* $Id: ss_tritmp.h,v 1.19 2002/10/29 22:25:57 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -112,14 +112,14 @@ static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 )
 	 v[1]->win[2] += offset;
 	 v[2]->win[2] += offset;
       }
-      _swsetup_render_point_tri( ctx, e0, e1, e2 );
+      _swsetup_render_point_tri( ctx, e0, e1, e2, facing );
    } else if (mode == GL_LINE) {
       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) {
 	 v[0]->win[2] += offset;
 	 v[1]->win[2] += offset;
 	 v[2]->win[2] += offset;
       }
-      _swsetup_render_line_tri( ctx, e0, e1, e2 );
+      _swsetup_render_line_tri( ctx, e0, e1, e2, facing );
    } else {
       if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) {
 	 v[0]->win[2] += offset;
-- 
2.30.2