> > We are talking of an FMC but of course
> > I wanted to redo at least the ehsi display (for the eye candy).
> Erik mentioned some time ago that it isn't yet really possible to
> do simple animations using Nasal in FlightGear, at least that's
> what Andy indicated when he was asked about that, I think.
I remember but I had the impression that they were afraid for the
performance.
> > This would have delayed the ehsi too much.
> is there really that much lag involved when doing
> such things using Nasal - i.e. NO smooth animations ?
I was not clear. I was saying that to do the ehsi I would have to wait
for
the implementation of some new graphic code.
Concerning smooth animations, I think it can be the same as current
instruments.
Now let me open a little parenthesis about a reflexion I had some times
ago.
We have a caneva to build 2d and 3d instruments and its doing the job
fine
for a wide variety of gauges. But even if can extend those
fonctionalities
there will always be some cases that can't be handled.
Lets call them owner draw gauges. How to draw them ? With pure opengl
code in C.
This is the first bottleneck. It seems stupid the have to build
Flightgear to
use a new gauge when someone release a new panel or new plane.
The other thing that disturb me is that this OD gauge should of course
work
on a 2d and on a 3d panel.
Let me remind you : a 2D gauge is a stack of layers (textures), a 3d
gauge is
a 3D gemoetry object (textured).
If we use only one texture for both the 2d and 3d gauge we have a
texture that can
be used for both instruments.
So this is my suggestion to have compatible 2d/3d specials gauges, ie
they both
refer to the same texture, this texture is generated by some special
code
(drawing to texture/pbuffer is something standard for 3d cards).
Now how do we draw in this texture ?
In Nasal of course, with the appropriate graphic library. Not a pseudo
opengl
library because there is no more than perhaps 10 api to implement :
draw a line, draw text, draw a texture, etc. I am prety sure we can pair
this
api to the existing draw code.
What about the performance ?
Imagine a simple gauge with a background and a needle. This could be
drawn with
3 lines of Nasal code:
DrawTexture(background, x,y),
Rotate(angle),
Drawtexture(nnedle, x,y)
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