progs/demos: use non-default texobj in cubemap.c

progs/demos/cubemap.c

@@ -58,6 +58,7 @@ static GLint ClampIndex = 0;
 static GLboolean supportFBO = GL_FALSE;
 static GLboolean supportSeamless = GL_FALSE;
 static GLboolean seamless = GL_FALSE;
+static GLuint TexObj = 0;
 
 
 static struct {
@@ -543,6 +544,10 @@ static void init( GLboolean useImageFiles )
 
    printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
 
+
+   glGenTextures(1, &TexObj);
+   glBindTexture(GL_TEXTURE_CUBE_MAP_ARB, TexObj);
+
    if (useImageFiles) {
       load_envmaps();
    }