LÖVE

// Convert all images to have a green background instead of transparent. This works by creating a green flag image and overlaying the input frame on top.
ffmpeg.exe -start_number 1000 -i mika_%04d.png -filter_complex "color=0x00FF00,format=rgb24[c];[c][0]scale2ref[c][i];[c][i]overlay=format=auto:shortest=1,setsar=1" out_%04d.png

// Convert the images into a video.
ffmpeg -framerate 50 -i out_%4d.png -c:v libtheora -pix_fmt yuv420p -vb 20M out.ogg

vec3 key = vec3(0.,1.,0.);
float threshold = 0.5;

vec4 effect(vec4 pxColor, Image tex, vec2 texture_coords, vec2 screen_coords) {
    vec4 videoColor = VideoTexel(texture_coords);
    if (length(videoColor.rgb - key) < threshold) videoColor.a = 0.0;
    return videoColor;
}

I don't know how well this would work, if at all, but how about using two ogv files - one with the RGB info, and one with just the alpha (stored in one of the RGB channels) and then using a shader to combine everything when drawing.

ecoste wrote: ↑Fri Aug 06, 2021 4:30 pm To some of the disgruntled posters: yes it's a hentai game.

ecoste wrote: ↑Fri Aug 06, 2021 4:30 pm To some of the disgruntled posters: yes it's a hentai game.

GVovkiv wrote: ↑Fri Aug 06, 2021 4:35 pm When and where and how much

Gunroar:Cannon() wrote: ↑Fri Aug 06, 2021 7:12 pm

ecoste wrote: ↑Fri Aug 06, 2021 4:30 pm To some of the disgruntled posters: yes it's a hentai game.

Okay, that explains it ... Not that disgrunted...but...anyway..we're all here to learn love (2d that is)!

GVovkiv wrote: ↑Fri Aug 06, 2021 4:35 pm When and where and how much

Black could be an option as a key colour, judging by the sample image, and that's great because bleeding effects might be reduced.

float base = 0.174;
float range = 0.03;

vec4 effect(vec4 pxColor, Image tex, vec2 texture_coords, vec2 screen_coords) {
    vec4 videoColor = VideoTexel(texture_coords);
    float len = length(videoColor.rgb);
    videoColor.a = (len - base) / range;
    return videoColor;
}

pgimeno wrote: ↑Fri Aug 06, 2021 11:10 pm Have you tried with black?

Black could be an option as a key colour, judging by the sample image, and that's great because bleeding effects might be reduced.

Making it progressive instead of hard alpha would help. Let's see...

The first RGBs in your image are R=19, G=18 and B=38. There isn't any pixel with R < 19, G < 18 or B < 38. Dividing by 255 and taking the length from (0,0,0) gives me 0.17458689638864366, so let's start the ramp there. You'll have to experiment a bit with the range.

Code: Select all

float base = 0.174;
float range = 0.03;

vec4 effect(vec4 pxColor, Image tex, vec2 texture_coords, vec2 screen_coords) {
    vec4 videoColor = VideoTexel(texture_coords);
    float len = length(videoColor.rgb);
    videoColor.a = (len - base) / range;
    return videoColor;
}

float base = 0.015;

vec4 effect(vec4 pxColor, Image tex, vec2 texture_coords, vec2 screen_coords) {
    vec4 videoColor = VideoTexel(texture_coords);
    float len = length(videoColor.rgb);
    videoColor.a = 1 - ((base - len) * (1.0 / base));
    return videoColor;
}

magick mogrify -format dds -path out/ -define dds:compression=dx5 mika_*.png

love.graphics.newImage(love.image.newCompressedData(fileName))