progs/tests: Add checks for GL_NV_vertex_program.

progs/tests/vpeval.c

@@ -145,6 +145,11 @@ myinit(int argc, char *argv[])
 
     printf("Using vertex program attribs? %s\n", program ? "yes" : "no");
 
+    if (program && !glutExtensionSupported("GL_NV_vertex_program")) {
+       printf("Sorry, this requires GL_NV_vertex_program\n");
+       exit(1);
+    }
+
     if (!program) {
         glMap2f(GL_MAP2_VERTEX_4,
                 0.0, 1.0, 4, 4,

progs/tests/vptest1.c

@@ -113,6 +113,11 @@ static void Init( void )
 
    GLuint progs[5];
 
+   if (!glutExtensionSupported("GL_NV_vertex_program")) {
+      printf("Sorry, this program requires GL_NV_vertex_program\n");
+      exit(1);
+   }
+
    glGenProgramsNV(2, progs);
    assert(progs[0]);
    assert(progs[1]);

progs/tests/vptest2.c

@@ -144,6 +144,12 @@ int main( int argc, char *argv[] )
    glutReshapeFunc( Reshape );
    glutKeyboardFunc( Key );
    glutDisplayFunc( Display );
+
+   if (!glutExtensionSupported("GL_NV_vertex_program")) {
+      printf("Sorry, this program requires GL_NV_vertex_program\n");
+      exit(1);
+   }
+
    Test1();
    Test2();
    Test3();

progs/tests/vptest3.c

@@ -93,6 +93,11 @@ static void Init( void )
 #endif
       "END\n";
 
+   if (!glutExtensionSupported("GL_NV_vertex_program")) {
+      printf("Sorry, this program requires GL_NV_vertex_program\n");
+      exit(1);
+   }
+
    glLoadProgramNV(GL_VERTEX_PROGRAM_NV, 1,
                    strlen(prog1),
                    (const GLubyte *) prog1);