shader code

shader_type particles;
render_mode keep_data;

uniform bool fadeCont;
uniform float fadeStep : hint_range(0.0, 10.0);
uniform float red : hint_range(0.0, 1.0);
uniform float green : hint_range(0.0, 1.0);
uniform float blue : hint_range(0.0, 1.0);
uniform float tex_anim_offset;

void start() {
    // Called when a particle is spawned.
}

void process() {
    // Called every frame on existing particles (according to the Fixed FPS property).
    CUSTOM.y += DELTA / LIFETIME;
    CUSTOM.w = 1.0;
    float tv = CUSTOM.y / CUSTOM.w;


    COLOR.rgb = vec3(COLOR.r * red, COLOR.g * green, COLOR.b * blue) * 10.0;

    if (fadeCont) {
        COLOR.a = 1.0 - tv;
    } else {
        COLOR.a = floor((1.0 - tv) * fadeStep) / fadeStep;
    }
    if (RESTART) {
        CUSTOM.z = tex_anim_offset;
        CUSTOM.y = 0.0;
        COLOR = vec4(1.0);
    }
}