util: check for frag/vertShader=0 before attaching

2008-12-17 13:58:05 -07:00
parent 3be8d6db9e
commit 637f06dcdc
1 changed files with 7 additions and 2 deletions
@@ -6,6 +6,7 @@
 */


+#include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <GL/glut.h>
@@ -106,8 +107,12 @@ LinkShaders(GLuint vertShader, GLuint fragShader)
 {
   GLuint program = glCreateProgram_func();

-   glAttachShader_func(program, fragShader);
-   glAttachShader_func(program, vertShader);
+   assert(vertShader || fragShader);
+
+   if (fragShader)
+      glAttachShader_func(program, fragShader);
+   if (vertShader)
+      glAttachShader_func(program, vertShader);
   glLinkProgram_func(program);

   /* check link */