> On Feb 23, 2016, at 8:30 AM, Michalis Kamburelis <[email protected]>
> wrote:
>
> It looks like the majority of the startup code is in castlewindow_android but
> I was expected to see an OpenGL context (surface view I think in Android).
> How do you render OpenGL then?
>
>
> castlewindow_android.inc does
>
> {$I castlewindow_egl.inc}
>
> and the code that initializes OpenGLES context is inside
> castlewindow_egl.inc. It's using EGL library,
> https://www.khronos.org/registry/egl/ , specification blessed by Khronos,
> available on Android, able to initialize OpenGL ES context.
>
> It can also be used to initialize OpenGL ES context on the desktops (which is
> useful to test OpenGL ES renderer on Linux, Windows etc.). That's why the
> code is not inside castlewindow_android.inc --- it's more generally useful.
>
I see now! I’m using OpenGLES 1.x but I think I can use the EGL window
functions you have translated in your OpenGLES 2 unit.
> So UNIX I/O “works” but you can’t read anything without the asset manager?
> That doesn’t really make sense but either way using the Asset manager in a
> stream like you did is just fine. I only need to read the contents of images
> and XML files anyways.
>
>
> UNIX I/O works for reading files. On disk (device internal memory, sdcard
> etc.).
>
> It doesn't work to read stuff from the apk. Because the files you put inside
> apk ("assets" in Android terminology) are not available to you as normal
> files inside the Android application. You don't know where (and if, at all)
> they are unpackaged on the Android filesystem. You can only access them
> (read-only) using AssetManager.
Ok. I need to learn about the file system more then.
>
> I was using ReadXMLFile to read the XML file but I assume this is just a
> helper function that wraps something lower level I could use in conjunction
> with the asset manager. Is that correct? Can’t find your code for this.
>
>
> See the URLReadXML implementation:
>
> procedure URLReadXML(out Doc: TXMLDocument; const URL: String);
> var
> Stream: TStream;
> begin
> Doc := nil; // clean "out" param at start, just like ReadXMLFile
> Stream := Download(URL, []);
> try
> ReadXMLFile(Doc, Stream);
> finally FreeAndNil(Stream) end;
> end;
>
> So it simply reads URL to a TStream, then uses overloaded ReadXMLFile version
> that reads XML from a stream:)
> So internally Android just uses the same C libraries we were using in Pascal?
> I guess that makes sense but I was thinking EVERYTHING on the system was now
> Java but that’s not the case I guess. The lesson here is that Android is
> built on Linux so we’re sharing more than I think.
This will probably make more sense when I learn about the asset manager more. I
think I read there is a format like asset:// for file URL’s.
Thanks again!
Regards,
Ryan Joseph
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