Document code, and clean up

src/context.c

@@ -1,15 +1,17 @@
 #include "main.h"
-#include <GL/gl.h>
+#include <GL/glew.h>
 
 void set_clean_color_context( unsigned char r, unsigned char g, unsigned char b )
 {
 	glEnable( GL_DEPTH_TEST );
-	glEnable( GL_CULL_FACE );
-	glCullFace( GL_BACK );
-
 	glClearColor( (float)r/0xff, (float)g/0xff, (float)b/0xff, 1.0 );
 }
 
+int init_context( void )
+{
+	return glewInit() == GLEW_OK;
+}
+
 void clean_context( void )
 {
 	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );