diff --git a/progs/fp/tri-position.c b/progs/fp/tri-position.c
index 18e8182..1c99082 100644
--- a/progs/fp/tri-position.c
+++ b/progs/fp/tri-position.c
@@ -15,7 +15,16 @@ static void Init( void )
       "MUL result.color, fragment.position, {.005}.x; \n"
       "END"
       ;
+   static const char *modulate2Dvert =
+     "!!ARBvp1.0\n"
+     "DP4 result.position.x, vertex.position, state.matrix.mvp.row[0];\n"
+     "DP4 result.position.y, vertex.position, state.matrix.mvp.row[1];\n"
+     "DP4 result.position.z, vertex.position, state.matrix.mvp.row[2];\n"
+     "DP4 result.position.w, vertex.position, state.matrix.mvp.row[3];\n"
+     "END"
+     ;
    GLuint modulateProg;
+   GLuint modulateProgVert;
 
    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
       printf("Error: GL_ARB_fragment_program not supported!\n");
@@ -35,6 +44,18 @@ static void Init( void )
 
    glEnable(GL_FRAGMENT_PROGRAM_ARB);
 
+   /* Setup the vertex program */
+   glGenProgramsARB(1, &modulateProgVert);
+   glBindProgramARB(GL_VERTEX_PROGRAM_ARB, modulateProgVert);
+   glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
+                        strlen(modulate2Dvert), (const GLubyte *)modulate2Dvert);
+
+   printf("glGetError = 0x%x\n", (int) glGetError());
+   printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
+          (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
+
+   glEnable(GL_VERTEX_PROGRAM_ARB);
+
    glClearColor(.3, .3, .3, 0);
 }