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authorBrian Paul <brianp@vmware.com>2010-02-15 18:04:00 -0700
committerBrian Paul <brianp@vmware.com>2010-02-15 18:04:39 -0700
commitc6e63f3cc235b2d7b06664a493584671a2493045 (patch)
tree9f254c44ea3fc2c999ed78312a775495a82721f2 /progs/redbook/convolution.c
parentbd3829b5f5b204d95d9ac3e5538ca11d0904ba7d (diff)
progs/redbook: use glew
Diffstat (limited to 'progs/redbook/convolution.c')
-rw-r--r--progs/redbook/convolution.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/progs/redbook/convolution.c b/progs/redbook/convolution.c
index e120c58632..0543379f24 100644
--- a/progs/redbook/convolution.c
+++ b/progs/redbook/convolution.c
@@ -45,6 +45,7 @@
* Use various 2D convolutions filters to find edges in an image.
*
*/
+#include <GL/glew.h>
#include <GL/glut.h>
#include <assert.h>
#include <stdio.h>
@@ -131,6 +132,11 @@ GLfloat laplacian[3][3] = {
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);
@@ -197,6 +203,7 @@ int main(int argc, char** argv)
glutInitWindowSize(width, height);
glutInitWindowPosition(100, 100);
glutCreateWindow(argv[0]);
+ glewInit();
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);