niri pixelated animations

gistfile1.txt

animations {
    window-open {
        duration-ms 500
        curve "linear"

        custom-shader r"
            vec4 open_color(vec3 coords_geo, vec3 size_geo) {
                if (coords_geo.x < 0.0 || coords_geo.x > 1.0 ||
                    coords_geo.y < 0.0 || coords_geo.y > 1.0)
                    return vec4(0.0);

                float cell_size = 32.0;
                vec2 grid = floor(size_geo.xy / cell_size);
                grid = max(grid, vec2(1.0));

                vec2 cell  = floor(coords_geo.xy * grid);
                vec2 local = fract(coords_geo.xy * grid);

                float t = (cell.x / grid.x + cell.y / grid.y) / 2.0;
                float d = 0.4;
                float cell_progress = clamp((niri_clamped_progress - t * (1.0 - d)) / d, 0.0, 1.0);

                vec2 dist = abs(local - 0.5);
                if (dist.x > cell_progress * 0.5 || dist.y > cell_progress * 0.5)
                    return vec4(0.0);

                // Blend sample point from cell centre toward exact pixel as cell opens,
                // so the final frame matches the live window with no jump.
                vec2 centre     = (cell + 0.5) / grid;
                vec2 sample_geo = mix(centre, coords_geo.xy, cell_progress);
                vec3 coords_tex = niri_geo_to_tex * vec3(clamp(sample_geo, 0.0, 1.0), 1.0);
                vec4 color      = texture2D(niri_tex, coords_tex.st);

                return color;
            }
        "
    }

    window-close {
        duration-ms 500
        curve "linear"

        custom-shader r"
            vec4 close_color(vec3 coords_geo, vec3 size_geo) {
                if (coords_geo.x < 0.0 || coords_geo.x > 1.0 ||
                    coords_geo.y < 0.0 || coords_geo.y > 1.0)
                    return vec4(0.0);

                float cell_size = 32.0;
                vec2 grid = floor(size_geo.xy / cell_size);
                grid = max(grid, vec2(1.0));

                vec2 cell  = floor(coords_geo.xy * grid);
                vec2 local = fract(coords_geo.xy * grid);

                float t = ((grid.x - 1.0 - cell.x) / grid.x + (grid.y - 1.0 - cell.y) / grid.y) / 2.0;
                float d = 0.4;
                float cell_progress = clamp((niri_clamped_progress - t * (1.0 - d)) / d, 0.0, 1.0);

                float scale = 1.0 - cell_progress;
                vec2 dist = abs(local - 0.5);
                if (dist.x > scale * 0.5 || dist.y > scale * 0.5)
                    return vec4(0.0);

                // Start sampling the exact pixel so frame 0 matches the live window,
                // then shift toward cell centre as the cell shrinks.
                vec2 centre     = (cell + 0.5) / grid;
                vec2 sample_geo = mix(coords_geo.xy, centre, cell_progress);
                vec3 coords_tex = niri_geo_to_tex * vec3(clamp(sample_geo, 0.0, 1.0), 1.0);
                vec4 color      = texture2D(niri_tex, coords_tex.st);

                return color;
            }
        "
    }
}