progs/redbook: use glew

1 files changed, 7 insertions, 0 deletions

diff --git a/progs/redbook/histogram.c b/progs/redbook/histogram.c
index 7ddceb69e2e..de1e59edea6 100644
--- a/progs/redbook/histogram.c
+++ b/progs/redbook/histogram.c
@@ -46,6 +46,7 @@
  *  use of the glHistogram() function.
  */
 
+#include <GL/glew.h>
 #include <GL/glut.h>
 #include <assert.h>
 #include <stdlib.h>
@@ -113,6 +114,11 @@ readImage( const char* filename, GLsizei* width, GLsizei *height )
 
 static void init(void)
 {
+   if (!glutExtensionSupported("GL_ARB_imaging")) {
+      fprintf(stderr, "Sorry, this program requires GL_ARB_imaging.\n");
+      exit(1);
+   }
+
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    glClearColor(0.0, 0.0, 0.0, 0.0);
 
@@ -192,6 +198,7 @@ int main(int argc, char** argv)
    glutInitWindowSize(width, height);
    glutInitWindowPosition(100, 100);
    glutCreateWindow(argv[0]);
+   glewInit();
    init();
    glutReshapeFunc(reshape);
    glutKeyboardFunc(keyboard);