Pixel-Composer/scripts/gradients_function/gradients_function.gml
2023-07-28 19:41:57 +02:00

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enum GRADIENT_INTER {
smooth,
none,
hue
}
function gradientKey(time, value) constructor {
self.time = time;
self.value = value;
static clone = function() { return new gradientKey(time, value); }
static serialize = function() { return {time, value}; }
}
function gradientObject(color = c_black) constructor {
static GRADIENT_LIMIT = 128;
if(is_array(color))
keys = [ new gradientKey(0, color[0]), new gradientKey(1, color[1]) ];
else
keys = [ new gradientKey(0, color) ];
type = GRADIENT_INTER.smooth;
static clone = function() {
var g = new gradientObject();
for( var i = 0, n = array_length(keys); i < n; i++ )
g.keys[i] = keys[i].clone();
g.type = type;
return g;
}
static add = function(_addkey, _deleteDup = true) {
if(array_length(keys) > GRADIENT_LIMIT) return;
if(array_length(keys) == 0) {
array_push(keys, _addkey);
return;
}
for(var i = 0; i < array_length(keys); i++) {
var _key = keys[i];
if(_key.time == _addkey.time) {
if(_deleteDup)
_key.value = _addkey.value;
return;
} else if(_key.time > _addkey.time) {
array_insert(keys, i, _addkey);
return;
}
}
array_push(keys, _addkey);
}
static eval = function(position) {
if(array_length(keys) == 0) return c_black;
if(array_length(keys) == 1) return keys[0].value;
for(var i = 0; i < array_length(keys); i++) {
var _key = keys[i];
if(_key.time < position) continue;
if(_key.time == position) return keys[i].value;
if(i == 0) //before first color
return keys[0].value;
var c0 = keys[i - 1].value;
if(type == GRADIENT_INTER.smooth) {
var rat = (position - keys[i - 1].time) / (keys[i].time - keys[i - 1].time);
var c1 = keys[i].value;
return merge_color(c0, c1, rat);
} else if(type == GRADIENT_INTER.none) {
return c0;
}
}
return keys[array_length(keys) - 1].value; //after last color
}
static draw = function(_x, _y, _w, _h, _a = 1) {
var uniform_grad_blend = shader_get_uniform(sh_gradient_display, "gradient_blend");
var uniform_grad = shader_get_uniform(sh_gradient_display, "gradient_color");
var uniform_grad_time = shader_get_uniform(sh_gradient_display, "gradient_time");
var uniform_grad_key = shader_get_uniform(sh_gradient_display, "gradient_keys");
var _grad_color = [];
var _grad_time = [];
var len = min(128, array_length(keys));
for(var i = 0; i < len; i++) {
if(keys[i].value == undefined) return;
_grad_color[i * 4 + 0] = color_get_red(keys[i].value) / 255;
_grad_color[i * 4 + 1] = color_get_green(keys[i].value) / 255;
_grad_color[i * 4 + 2] = color_get_blue(keys[i].value) / 255;
_grad_color[i * 4 + 3] = 1;
_grad_time[i] = keys[i].time;
}
if(len == 0) {
draw_sprite_stretched_ext(s_fx_pixel, 0, _x, _y, _w, _h, c_white, _a)
} else {
shader_set(sh_gradient_display);
shader_set_uniform_i(uniform_grad_blend, type);
shader_set_uniform_f_array_safe(uniform_grad, _grad_color, GRADIENT_LIMIT * 4);
shader_set_uniform_f_array_safe(uniform_grad_time, _grad_time);
shader_set_uniform_i(uniform_grad_key, len);
draw_sprite_stretched_ext(s_fx_pixel, 0, _x, _y, _w, _h, c_white, _a)
shader_reset();
}
}
static toArray = function() {
var _grad_color = [], _grad_time = [];
for(var i = 0; i < array_length(keys); i++) {
if(is_undefined(keys[i].value)) continue;
_grad_color[i * 4 + 0] = color_get_red(keys[i].value) / 255;
_grad_color[i * 4 + 1] = color_get_green(keys[i].value) / 255;
_grad_color[i * 4 + 2] = color_get_blue(keys[i].value) / 255;
_grad_color[i * 4 + 3] = 1;
_grad_time[i] = keys[i].time;
}
return [ _grad_color, _grad_time ];
}
static lerpTo = function(target, amount) {
var grad = new gradientObject();
grad.keys = [];
grad.type = type;
var key_count = ceil(lerp(array_length(keys), array_length(target.keys), amount));
for( var i = 0; i < key_count; i++ ) {
var rat = i / (key_count - 1);
var kf = keys[rat * (array_length(keys) - 1)];
var kt = target.keys[rat * (array_length(target.keys) - 1)];
var time = lerp(kf.time, kt.time, amount);
var value = merge_color(eval(time), target.eval(time), amount);
grad.keys[i] = new gradientKey(time, value);
}
return grad;
}
static clone = function() {
var g = new gradientObject();
g.keys = [];
g.type = type;
for( var i = 0, n = array_length(keys); i < n; i++ )
g.keys[i] = keys[i].clone();
return g;
}
static serialize = function() {
var s = {type};
s.keys = [];
for( var i = 0, n = array_length(keys); i < n; i++ )
s.keys[i] = keys[i].serialize();
return json_stringify(s, false);
}
static deserialize = function(str) {
var s;
if(is_string(str))
s = json_try_parse(str);
else if(is_struct(str))
s = str;
else if(is_array(str)) {
keys = [];
for( var i = 0, n = array_length(str); i < n; i++ )
keys[i] = new gradientKey(str[i].time, str[i].value);
return self;
}
type = s.type;
keys = [];
for( var i = 0, n = array_length(s.keys); i < n; i++ )
keys[i] = new gradientKey(s.keys[i].time, s.keys[i].value);
return self;
}
}
function loadGradient(path) {
if(path == "") return noone;
if(!file_exists(path)) return noone;
var grad = new gradientObject();
grad.keys = [];
var _t = file_text_open_read(path);
while(!file_text_eof(_t)) {
var key = string_trim(file_text_readln(_t));
var _col = 0, _pos = 0;
if(string_pos(",", key)) {
var keys = string_splice(key, ",");
if(array_length(keys) < 2) continue;
_col = toNumber(keys[0]);
_pos = toNumber(keys[1]);
} else {
_col = toNumber(key);
if(file_text_eof(_t)) break;
_pos = toNumber(file_text_readln(_t));
}
array_push(grad.keys, new gradientKey(_pos, _col));
}
file_text_close(_t);
return grad;
}