GLProgram: define initialize in ruby, allow attaching shaders

src/GLProgram.cc

@@ -1,4 +1,5 @@
 #include "GLProgram.h"
+#include "GLShader.h"
 #include "ruby.h"
 #include "gl3w.h"
 
@@ -21,7 +22,7 @@ static void GLProgram_free(void * ptr)
     delete program;
 }
 
-static VALUE GLProgram_new(VALUE klass)
+static VALUE GLProgram_new(int argc, VALUE * argv, VALUE klass)
 {
     GLProgram * glprogram = new GLProgram();
 
@@ -31,26 +32,29 @@ static VALUE GLProgram_new(VALUE klass)
         rb_raise(rb_eRuntimeError, "Error allocating GL program object");
     }
 
-    return Data_Wrap_Struct(klass, NULL, GLProgram_free, glprogram);
+    VALUE rv = Data_Wrap_Struct(klass, NULL, GLProgram_free, glprogram);
+    rb_obj_call_init(rv, argc, argv);
+
+    return rv;
+}
+
+static VALUE GLProgram_attach_shader(VALUE self, VALUE gl_shader)
+{
+    GLProgram * glprogram;
+    Data_Get_Struct(self, GLProgram, glprogram);
+    glAttachShader(glprogram->id, GLShader_id(gl_shader));
+
+    return Qnil;
 }
 
 void GLProgram_Init()
 {
     ruby_class = rb_define_class("GLProgram", rb_cObject);
-    rb_define_singleton_method(ruby_class, "new", (VALUE(*)(...))GLProgram_new, 0);
-    rb_define_attr(ruby_class, "id", 0, 1);
+    rb_define_singleton_method(ruby_class, "new", (VALUE(*)(...))GLProgram_new, -1);
+    rb_define_method(ruby_class, "attach_shader", (VALUE(*)(...))GLProgram_attach_shader, 1);
 }
 
 #if 0
-GLProgram & GLProgram::attach_shader(GLShaderRef shader)
-{
-    if (m_id > 0u)
-    {
-        glAttachShader(m_id, shader->get_id());
-    }
-    return *this;
-}
-
 GLProgram & GLProgram::bind_attribute(const char * attribute, GLuint index)
 {
     if (m_id > 0u)