Re: [Lazarus] NanoVG Graphics

[Anthony Walter via lazarus]

Darius,

No I hadn't heard of GLPT before you posted the link. It looks interesting,
but I was just reading up on SFML and had a few thought which are
pertinent. I've been using SDL, and although it's a fairly good library,
there are other libraries which offer a few more features that I'd had to
implement in my toolkit, and now in retrospect I believe ought to be
included in libraries of the same vein, including the GLPT library you
mentioned.

Here are some of the things both GLPT and SDL do not handle, but I
believe ought to be included in a game/multimedia framework as they
sometimes require a bit of work and are things everyone will eventually
need is they write enough of these types of programs:

A stereo audio mixer that can handle mp3, ogg, and direct wav samples
without the need to include 3rd party additional modules
Text rendering with the ability to load local ttf files, get metrics, draw
to a texture, and possibly generate vector shapes
A unified TCP and UDP network stack
A unified image load, saving, and capture system
Audio input or recording function optionally with VOIP support
A tessellator to turn a complex shape into triangles with indexes,
supporting winding modes
The ability to ask for a graphics API type and version (eg, OpenGLES 2.0 or
Vulkan 1.1) receive a callback to load said API functions
A video decoder to take a video stream and convert frames to textures or
render buffers

Having listed those items, SFML handles a lot of those things. SDL can
handle most of them as well with their SDL modules, but I always avoid SDL
modules. GLPT doesn't handle much beyond window creating, events, some
image loading, and maybe a few basic text features.

Personally, I have gone the tough route and written Pascal units to
interface with several 3rd party libraries to add text and font features
(FreeType), audio decoders (mpg123), and video steam processing to render
buffers (libmpv). Now maybe it is convenient to use my library, but it's
Pascal and rider on top of all these things, which I am sure how SFML
works, but I am also fairly confident that a single well maintained cross
platform library with many more users, such as SFML or SDL with modules,
might be more attractive to people wanting to get started with everything
packed more neatly than the way my requirements are gathered.
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Re: [Lazarus] NanoVG Graphics

[Darius Blaszyk via lazarus]

Hi Anthony,

Have you considered GPLT for OpenGL context creation?

https://github.com/daar/GLPT

Rgds, Darius


Verstuurd vanaf mijn iPhone

> The library does not have any code to manage creating a window, creating a 
> valid opengl context, or handle event processing. These are things which are 
> not exactly trivial in nature, especially in a cross platform manner. 
> Typically for simplicity makers of OpenGL demos rely upon things like GLFW 
> (Graphics Library FrameWork) to get a demo working. Other libraries to do the 
> same thing are SDL, GLUT, SFML, or other similar libraries.
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Re: [Lazarus] NanoVG Graphics

[Anthony Walter via lazarus]

Marc,

The library does not have any code to manage creating a window, creating a
valid opengl context, or handle event processing. These are things which
are not exactly trivial in nature, especially in a cross platform manner.
Typically for simplicity makers of OpenGL demos rely upon things like GLFW
(Graphics Library FrameWork) to get a demo working. Other libraries to do
the same thing are SDL, GLUT, SFML, or other similar libraries.

The good news is that NanoVG is designed to work independently of those
things. The original C implementation has a callback stub to load the
appropriate OpenGL functions based on which back end you choose.
Fortunately this tool named Glad  makes it very
simple to create a correct Pascal (or other language) file for the various
OpenGL versions. This is probably something we ought to consider using in
the FCL, so that for example people would know what functions to load for
OpenGL ES versus the full version of OpenGL.

And finally the LCL and TOpenGLControl provided in the components folder
handle all the requirements already, so if you wanted to use a NanoVG port
with Lazarus it ought to be as simple as including some NanoVG.pas in your
project and putting a few NanoVG drawing function calls into your
TForm1.OpenGLControl1Paint method. In this way using hardware accelerated
animated vector text and graphics in any desktop project would be very
easy. NanoVG even includes functions to draw vector controls such as
sliders, check boxes, buttons, and combo boxes.
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Re: [Lazarus] NanoVG Graphics

[Marc Weustink via lazarus]

Anthony Walter via lazarus wrote:
I am starting a rewrite of my 2D hardware accelerated Pascal graphics 
library based on an OpenGL 3D backend, and I stumbled across an open 
source project called NanoVG. I am impressed with how small and self 
contained NanoVG is, and although I will recreated my 2D graphics 
library upon OpenGL without using NanoVG, I though some of you on the 
mailing list might have some interest.




I've been playing with the demos on VC2017, it requires 2 other external 
libraries to run.


Marc
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Re: [Lazarus] NanoVG Graphics

[Marc Weustink via lazarus]

Anthony Walter via lazarus wrote:
I am starting a rewrite of my 2D hardware accelerated Pascal graphics 
library based on an OpenGL 3D backend, and I stumbled across an open 
source project called NanoVG. I am impressed with how small and self 
contained NanoVG is, and although I will recreated my 2D graphics 
library upon OpenGL without using NanoVG, I though some of you on the 
mailing list might have some interest.


I've been playing with the demos on VC2017, it requires 2 other external 
libraries to run.


Marc
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Re: [Lazarus] NanoVG Graphics

[Ryan Joseph via lazarus]

> On Jan 26, 2020, at 2:13 PM, Anthony Walter via lazarus 
>  wrote:
> 
> What's important is that several people have ported the projects to other 
> languages and backends (DX11 for example). Looking at how small and self 
> contain it is, it would seem like a task that would not that difficult to 
> port to Pascal.
> 

It looks like a great library but glancing over the project tells me that 
porting all of that to Pascal would take many days. Probably best to just make 
a binding.

Regards,
Ryan Joseph

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Re: [Lazarus] NanoVG Graphics

[Fabio Luis Girardi via lazarus]

What thinks about Anthony?

Translate NanoVG sources from C to Pascal or made a library bindings for
that?

Em dom., 26 de jan. de 2020 às 04:14, Anthony Walter via lazarus <
lazarus@lists.lazarus-ide.org> escreveu:

> I am starting a rewrite of my 2D hardware accelerated Pascal graphics
> library based on an OpenGL 3D backend, and I stumbled across an open source
> project called NanoVG. I am impressed with how small and self contained
> NanoVG is, and although I will recreated my 2D graphics library upon OpenGL
> without using NanoVG, I though some of you on the mailing list might have
> some interest.
>
> Here is some reference material on NanoVG:
>
> Original github page, but there might be an improved fork I can't find at
> the moment 
> How to build User Interfaces and 2D Shapes with NanoVG
> 
>
> What's important is that several people have ported the projects to other
> languages and backends (DX11 for example). Looking at how small and self
> contain it is, it would seem like a task that would not that difficult to
> port to Pascal.
>
> I believe it would be an interesting project that would benefit us Pascal
> users greater if it were ported and was wondering if anyone of you might
> pick up the torch so to speak. Normally I wouldn't have too much of an
> issue with porting a project like this, but my graphics backend has already
> been written once and I will be adding a few features beyond NanoVG, and
> also using a different design. I would rather compare the two, NanoVG
> written in Pascal, and my library rather than merge them or at the least be
> though of as having copying ideas from NanoVG, so I want to keep these
> worlds separate.
>
> If anyone has thoughts about a Pascal version of NanoVG, possibly even
> from a more updated git repo, please send you feedback to others in this
> thread.
>
> Thank you, Anthony.
>
> 
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-- 
The best regards,

Fabio Luis Girardi
PascalSCADA Project
http://sourceforge.net/projects/pascalscada
http://www.pascalscada.com
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