I want to make a fire effect like this one : https://glsl.heroku.com/e#11669.0
I tried to do it in Lua, but it don't work : there is no waves, just a color
Can you help me please ?
feu.glsl :
Code: Select all
extern number time;
extern vec2 resolution;
vec3 iResolution = vec3(resolution.x, resolution.y, 100.0);
number iGlobalTime = time;
number rand(vec2 n) {
return fract(cos(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
}
// Genera ruido en función de las coordenadas del pixel
number noise(vec2 n) {
const vec2 d = vec2(0.0, 1.0);
vec2 b = floor(n), f = smoothstep(vec2(0.0), vec2(1.0), fract(n));
return mix(mix(rand(b), rand(b + d.yx), f.x), mix(rand(b + d.xy), rand(b + d.yy), f.x), f.y);
}
// Fractional Brownian Amplitude. Suma varias "capas" de ruido.
number fbm(vec2 n) {
number total = 0.0, amplitude = 1.0;
for (int i = 0; i < 4; i++) {
total += noise(n) * amplitude;
n += n;
amplitude *= 0.5;
}
return total;
}
vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords)
{
texture_coords = texture_coords - 0.5;
const vec3 c1 = vec3(0.1, 0.0, 0.0); // Rojo oscuro.
const vec3 c2 = vec3(0.7, 0.0, 0.0); // Rojo claro.
const vec3 c3 = vec3(0.2, 0.0, 0.0); // Rojo oscuro.
const vec3 c4 = vec3(1.0, 0.9, 0.0); // Amarillo.
const vec3 c5 = vec3(0.1); // Gris oscuro.
const vec3 c6 = vec3(0.9); // Gris claro.
vec2 p = texture_coords.xy * 16.0 / iResolution.xx; // Desfasa las coordenadas para que haya más cambio de un resultado a los colindantes.
number q = fbm(p - iGlobalTime * 0.5);
vec2 r = vec2(fbm(p + q + iGlobalTime * 0.7 - p.x - p.y), fbm(p + q - iGlobalTime * 0.4));
vec3 c = mix(c1, c2, fbm(p + r)) + mix(c3, c4, r.x) - mix(c5, c6, r.y);
return vec4(c *
cos(1.57 * texture_coords.y / iResolution.y), // Gradiente más ocuro arriba.
1.0);
}
Code: Select all
local lg = love.graphics
local swidth, sheight = lg.getWidth, lg.getHeight
function love.load()
lg.setBackgroundColor(35, 30, 65)
time = 0
lg.setDefaultImageFilter("nearest", "nearest")
effect = lg.newPixelEffect "feu.glsl"
effect:send("resolution", {1, 1})
effect:send("time", time)
end
function love.update (dt)
time = time + dt
effect:send("time", time)
end
function love.draw ()
lg.clear()
lg.setPixelEffect(effect)
lg.setColor(0, 0, 0, 0)
lg.rectangle('fill', 0, 0, swidth(), sheight())
lg.setPixelEffect()
end
