VALUE ray_image_target_alloc(VALUE self) {
if (!say_image_target_is_available())
rb_raise(rb_eRuntimeError, "Ray::RenderImage is not supported here");
say_image_target *target = say_image_target_create();
return Data_Wrap_Struct(ray_cImageTarget, NULL, say_image_target_free,
target);
}
/*
* Unbinds any image target
*
* This is rarely needed, as this method gets called automatically when a window
* is bound, and because windows and image targets do not share the same OpenGL
* context.
*/
VALUE ray_image_target_unbind(VALUE self) {
/*
* No need for an error when this is not supported, because it just means
* we don't need to unbind anything.
*/
if (say_image_target_is_available())
say_image_target_unbind();
return Qnil;
}
/*
* Checks availability of image targets
*
* Image targets are only part of OpenGL core since OpenGL 3 (although they may
* be supported as an extension in older versions).
*
* @return [true, false] True when ImageTargets are available
*/
VALUE ray_image_target_available(VALUE self) {
return say_image_target_is_available() ? Qtrue : Qfalse;
}
void say_image_target_unbind() {
if (say_image_target_is_available())
say_fbo_make_current(0);
}