Re: [Re: [Re: Ecartis command results: SUBSCRIBE]]

thats good enough to experiment with. i wish i could play with it now! :] so
how easy would it be to add a simple sprite functionality? for speed
concerns, can vertex data be loaded into VRAM instead of sending it each
frame? anyway, exactly how much openGL support can be accomplished?

----- Original Message -----
From: "Jeffrey Massung" <jma_at_mfire.com>
To: <sftalk_at_forth.com>
Sent: Friday, November 07, 2003 7:00 PM
Subject: [sftalk] Re: [Re: [Re: Ecartis command results: SUBSCRIBE]]

> Roger,
>
> Right now, it is just a simple system. While I do plan on extending it to=
>
> support a few more things, right now it does none of that.
>
> SFGL does the following:
>
> o Ability to quickly bring up an OpenGL Window
> o Pass floating point and double values to OpenGL DLL
> o Control and render a complete entity system
> o 1 simple, directional light (at the camera)
> o A few built-in primitives to use (like cube, sphere, etc.)
> o Picking entities with the mouse
>
> Texture mapping, 3D model loading, etc. are all certainly possible, thoug=
> h,
> the way SFGL is set up. Let me explain:
>
> Everything rendered is done through a subclass of Entity3D, which has a
> defered function: DRAW, which is called by the engine each frame. In this=
> , you
> can use any and all OpenGL routines to construct your object. For example=
> (a
> simple quad):
>
> Entity3D SUBCLASS MyQuad
>
> : DRAW ( -- )
> GL_QUADS :: glBegin
> -1e -1e 0e 3sfparms glVertex3f
> 1e -1e 0e 3sfparms glVertex3f
> 1e 1e 0e 3sfparms glVertex3f
> -1e 1e 0e 3sfparms glVertex3f
> :: glEnd ;
>
> END-CLASS
>
> As you can see, you could do texture mapping, etc. inside the DRAW functi=
> on.
> Now you can create a new quad and add it to the "world" with very little =
> code,
> too:
>
> MyQuad BUILDS quad
> quad SFGL-WORLD ADD-ENTITY
>
> That's it. It will now be rendered each frame of animation. There are als=
> o
> functions for controlling each entity:
>
> Entity3D -> STRAFE ( x -- )
> Entity3D -> ELEVATE ( y -- )
> Entity3D -> MOVEFORWARD ( z -- )
> Entity3D -> Pitch ( degrees -- )
> Entity3D -> Yaw ( degrees -- )
> Entity3D -> Roll ( degrees -- )
>
> Among others. You can also add limbs (using ADD-ENTITY) to any object. So=
> if
> you add a sphere as a limb of your quad, above, then as you rotate the qu=
> ad,
> the sphere will rotate around it, etc.
>
> That's about it right now. There are a few things I'm trying to work arou=
> nd in
> SwiftForth to make some things work, but overall I think it is a good sys=
> tem.
> I'll probably start back up on it in 2-4 weeks and throw up some sample c=
> ode
> on my website.
>
> Jeff
>
>
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Received on Fri Nov 07 2003 - 17:40:34 PST