diff --git a/progs/trivial/.gitignore b/progs/trivial/.gitignore
index d77f120b96b..f58345ce3b1 100644
--- a/progs/trivial/.gitignore
+++ b/progs/trivial/.gitignore
@@ -102,6 +102,7 @@ tri-tri
 tri-unfilled
 tri-unfilled-clip
 tri-unfilled-edgeflag
+tri-unfilled-fog
 tri-unfilled-smooth
 tri-unfilled-tri
 tri-unfilled-tri-lit
diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile
index dce96f6bc8c..2800f3ef823 100644
--- a/progs/trivial/Makefile
+++ b/progs/trivial/Makefile
@@ -108,6 +108,7 @@ SOURCES = \
 	tri-tex.c \
 	tri-tex-3d.c \
 	tri-tri.c \
+	tri-unfilled-fog.c \
 	tri-unfilled-edgeflag.c \
 	tri-unfilled-clip.c \
 	tri-unfilled-smooth.c \
diff --git a/progs/trivial/SConscript b/progs/trivial/SConscript
index 76826d9be08..d699e2b46b5 100644
--- a/progs/trivial/SConscript
+++ b/progs/trivial/SConscript
@@ -103,6 +103,7 @@ progs = [
 	'tri-tex',
 	'tri-tex-3d',
 	'tri-tri',
+	'tri-unfilled-fog',
 	'tri-unfilled-edgeflag',
 	'tri-unfilled-clip',
 	'tri-unfilled-smooth',
diff --git a/progs/trivial/tri-unfilled-fog.c b/progs/trivial/tri-unfilled-fog.c
new file mode 100644
index 00000000000..90444aecdfd
--- /dev/null
+++ b/progs/trivial/tri-unfilled-fog.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
+ * ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+
+
+#define CI_OFFSET_1 16
+#define CI_OFFSET_2 32
+
+GLint Width = 250, Height = 250;
+
+GLenum doubleBuffer;
+
+static void Init(void)
+{
+   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+
+   glClearColor(0.0, 0.0, 1.0, 0.0);
+}
+
+static void Reshape(int width, int height)
+{
+   glViewport(0, 0, (GLint)width, (GLint)height);
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+   glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 27:
+         exit(1);
+   }
+
+   glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT); 
+
+   glEnable(GL_FOG);
+
+   glPolygonMode(GL_FRONT, GL_FILL);
+   glPolygonMode(GL_BACK, GL_FILL);
+
+   glBegin(GL_TRIANGLES);
+   glColor3f(0,0,.7); 
+   glVertex3f( 0.7, -0.7, -30.0);
+   glColor3f(.8,0,0); 
+   glVertex3f( 0.7,  0.7, -30.0);
+   glColor3f(0,.9,0); 
+   glVertex3f(-0.7,  0.0, -30.0);
+   glEnd();
+
+   glPolygonMode(GL_FRONT, GL_LINE);
+   glPolygonMode(GL_BACK, GL_LINE);
+
+   glBegin(GL_TRIANGLES);
+   glColor3f(0,0,.7); 
+   glVertex3f( 0.9, -0.9, -30.0);
+   glColor3f(.8,0,0); 
+   glVertex3f( 0.9,  0.9, -30.0);
+   glColor3f(0,.9,0); 
+   glVertex3f(-0.9,  0.0, -30.0);
+   glEnd();
+
+   glDisable(GL_FOG);
+
+   glFlush();
+
+   if (doubleBuffer) {
+      glutSwapBuffers();
+   }
+}
+
+static GLenum Args(int argc, char **argv)
+{
+   GLint i;
+
+   doubleBuffer = GL_FALSE;
+
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-sb") == 0) {
+         doubleBuffer = GL_FALSE;
+      } else if (strcmp(argv[i], "-db") == 0) {
+         doubleBuffer = GL_TRUE;
+      } else {
+         fprintf(stderr, "%s (Bad option).\n", argv[i]);
+         return GL_FALSE;
+      }
+   }
+   return GL_TRUE;
+}
+
+int main(int argc, char **argv)
+{
+   GLenum type;
+
+   glutInit(&argc, argv);
+
+   if (Args(argc, argv) == GL_FALSE) {
+      exit(1);
+   }
+
+   glutInitWindowPosition(100, 0); glutInitWindowSize(Width, Height);
+
+   type = GLUT_RGB;
+   type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+   glutInitDisplayMode(type);
+
+   if (glutCreateWindow("Filled and unfilled fog tri") == GL_FALSE) {
+      exit(1);
+   }
+
+   Init();
+
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   glutMainLoop();
+   return 0;
+}