[osg-users] Fast cycling of textured rectangles

[Christoph Heindl]

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?

Best,
Christoph


Sebastian Messerschmidt <sebastian.messerschmidt at 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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