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Hot-swap Bitmap

Posted: Sat May 07, 2016 8:45 am
by Kjell
:!:

In case you're using a lot of imported images, attached is a example that swaps out the data of a imported Bitmap at run-time ( to ensure that only 1 texture resides on the GPU at once ) .. press 1 or 2 on your keyboard to load a image.

K

Re: Hot-swap Bitmap

Posted: Sat May 07, 2016 6:55 pm
by Rado1
Nice trick to use files in this way. But are not embedded files loaded to memory as well? People would maybe appreciate runtime loading of bitmap files from file system.

Re: Hot-swap Bitmap

Posted: Sat May 07, 2016 7:04 pm
by Kjell
Hi Rado1,
Rado1 wrote:But are not files loaded to memory as well?
The only thing that this method does is recycle the memory allocated for a texture on the GPU.

So if you'd for instance have a slideshow of 20 Bitmaps ( 512x288 ) by simply swapping MaterialTexture.Texture .. it would use 0.6MB of GPU RAM when the slideshow starts, 1.2MB after the 2nd image has been shown and 11MB once all images have been shown. Whereas using this technique you're always using only 0.6MB.
Rado1 wrote:People would maybe appreciate runtime loading of bitmap files from file system.
Sure, you don't have to embed the file if you don't want to ;)

K

Re: Hot-swap Bitmap

Posted: Wed Jul 22, 2020 4:30 pm
by Lupo
Hi,

Thanks for the example.

Would it be easy to load the bitmaps from an external file instead of embedded?

Re: Hot-swap Bitmap

Posted: Thu Jul 23, 2020 9:51 am
by Kjell
Hi Lupo,
Lupo wrote: Wed Jul 22, 2020 4:30 pmWould it be easy to load the bitmaps from an external file instead of embedded?
The principle is easy .. but since ZGE doesn't have any image decoders built-in ( aside from a JPG subset ) it really depends on the image format(s) that you want to support whether or not it's easy.

K

Re: Hot-swap Bitmap

Posted: Mon Jul 27, 2020 1:05 am
by Lupo
Thanks for the answer.

I can remember the nano-jpeg embedded... I found the example project.

Thanks,
Luis.