Update 74

This week I have done more art for the game, and then packing the art into multiple sprite sheets. After that, I have spent multiple days trying to optimize the loading of the sprite sheet.

At first, I have been trying to implement a support for DXT texture, but with SDL_gpu using stb_image to load the texture into an SDL_Surface and then converting it to a GPU_Image. I have tried to decode the DXT textures with GLI, but after that SDL_gpu was not able to recognize the format.

Another problem with DXT texture is the artifacts produced by the compression so I have been trying to find a format lossless and fast. I have made a small benchmark for png with no compression and a lot of compression with stb_image and libpng.

compressed png (stb_image): 360.591 ms
uncompressed png (libpng): 543.351 ms
compressed png (libpng): 330.504 ms

I was expecting the png with no compression to be faster, the time to read the file seems to outweigh the decoding of the png. The small png are compressed with TruePNG and the zopflipng with the max compression settings. To make the game load faster I can first load all the asset for a level in the RAM and then for each map transfer the asset needed into the VRAM. The total memory needed to load the assets of the level is: 30 * 2048 *2048 * 4 = 503 MB. This is fine since most people have at least 4GB of RAM.

To make the game load faster I can first load all the asset for a level in the RAM and then for each map transfer the asset needed into the VRAM. The total memory needed to load the assets of the level is: 30 * 2048 *2048 * 4 = 503 MB. This is fine since most people have at least 4GB of RAM (steam survey).

To make the game load faster I can first load all the asset for a level in the RAM and then for each map transfer the asset needed into the VRAM. The total memory needed to load the assets of the level is: 30 * 2048 *2048 * 4 = 503 MB. This is fine since most people have at least 4GB of RAM.

For the moment, loading on the fly compressed png files seem efficient enough, the loading time is around 1 second for the map with the most sprites to load.

One thought on “Update 74”

  1. Good post. I learn something new and challenging on blogs I stumbleupon on a daily basis. It will always be exciting to read through articles from other writers and use something from their sites.

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