@group(1) @binding(0) var color_map_texture: texture_2d<f32>;
@group(1) @binding(1) var color_map_sampler: sampler;
@group(1) @binding(2) var<uniform> color_map_params: ColorMapParams;

struct ColorMapParams {
    color_count: u32,
    value_min: f32,
    value_max: f32
    invalid_value: f32
}

fn find_idx(ratio: f32) -> f32 {
    var sum = 0.0;
    var i = 0.0;
    var count = (color_map_params.color_count - 1) as f32;
    while (ratio > sum) {
        sum += textureSample(color_map_texture, color_map_sampler, vec2<f32>(i / count, 0.0)).r;
        i += 1.0;
    }
    return i / count;
}


fn linear_colormap(value: f32) -> vec4f {
    var v = clamp((value - color_map_params.value_min) / (color_map_params.value_max - color_map_params.value_min), 0.0, 1.0);
    float idx = find_idx(v);
    let c0: vec3f = textureSample(color_map_texture, color_map_sampler, vec2<f32>(idx, 0.0)).rgb;
    return vec4f(c0, 1.0);
}