add initial Buffer class

src/Buffer.cc

@@ -0,0 +1,17 @@
+#include "Buffer.h"
+#include "ruby.h"
+
+static VALUE ruby_class;
+
+static VALUE Buffer_brackets(VALUE self, VALUE index)
+{
+    /* TODO: implement for real */
+    VALUE s = rb_funcall(index, rb_intern("to_s"), 0);
+    return s;
+}
+
+void Buffer_Init()
+{
+    ruby_class = rb_define_class("Buffer", rb_cObject);
+    rb_define_method(ruby_class, "[]", (VALUE(*)(...))Buffer_brackets, 1);
+}

src/Buffer.h

@@ -0,0 +1,6 @@
+#ifndef BUFFER_H
+#define BUFFER_H
+
+void Buffer_Init();
+
+#endif

src/main.cc

@@ -1,6 +1,7 @@
 #include <iostream>
 #include "ruby.h"
 
+#include "Buffer.h"
 #include "Font.h"
 #include "GL.h"
 #include "GLProgram.h"
@@ -54,6 +55,7 @@ static int bootstrap()
     int rv = 0;
     int err_state = 0;
 
+    Buffer_Init();
     Font_Init();
     GL_Init();
     GLProgram_Init();