Hi,
Hi Sebastian,
thanks for your input If I'd be switching texture binding, wouldn't
that mean that the scene still has to be rasterized before display? My
ultimate intention is to skip rasterization at all (i.e rasterizing
all patterns once at init) and just copy final pixels. Is that feasible?
Changing texture coordinates or switching binding is fast
enough.Rasterizing has to be done in any case you want to put it to
screen. I assume your patterns are images that you can pre-calculate, so
sending them to the GPU is the matter of adding them to a texture
object. Simply try it, it is really simple. Else, try to explain the
problem you want to solve more detailed.
Cheers
Sebastian
Best,
Christoph
Sebastian Messerschmidt <sebastian.messerschm...@gmx.de
<mailto:sebastian.messerschm...@gmx.de>> schrieb am Fr., 13. Nov. 2015
um 20:42 Uhr:
Hello Christoph,
You can use either a texture which contains all the textures and
modify the texture coordinates (so to say a matrix of different
textures).
Also texture arrays might help here a lot, if all the textures are
of the same dimensions.
Anyways, what you might you see are initial costs. Once the
texture is transfered to the GPU and your memory is not filled,
subsequent use should be a matter of switching texture units binding.
Cheers
Sebastian
Hi everyone,
I'm working on a project where I need to display different
patterns (textured rectangles) as quickly as possible. Currently,
i have an osgViewer with a single view running that holds a
single textured rectangle and upon user request, the texture /
image is updated. This works quite ok, but requires a CPU->GPU
transfer every time I intend to update the image.
I think there must be a way to improve performance when I know
the set of patterns images beforehand. So, I would like to
prepare pre-rendered textured-quads on the GPU and upon user
request just cycle between those pre-rendered elements. That
should reduce the CPU->GPU overhead to initialization time.
I somehow have the feeling that the solution requires a
frame-buffer / render-buffer object per pattern and somehow
involves glBlitFramebuffer to display the correct frame buffer,
but I'm stuck in how to implement this in OSG.
Any kick start would be greatly appreciated!
Best,
Christoph
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