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local shader = [[
extern Image diffuse;
extern number mx;
extern number my;
vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords)
{
vec3 light_vec = vec3(mx ,my,1);
vec3 light_direction = light_vec - vec3(pixel_coords, 0);
float distance = length(light_direction);
light_direction = normalize(light_direction);
vec3 normal = Texel(texture, texture_coords).xyz;
normal.y = 1 - normal.y;
normal = normalize(mix(vec3(-1), vec3(1), normal));
//float attenuation = 1/(7e-5*pow(distance, 2));
float attenuation = 5000/pow(distance, 2);
//float attenuation = 1;
float diffuse_term = clamp(attenuation * dot(normal, light_direction), 0.0, 1.0);
vec3 dark_color = vec3(0.0, 0.0, 1);
//vec3 light_color = vec3(0.6, 0.6, 0.0);
vec3 light_color = vec3(0.8, 0.8, 0.0);
vec3 ambient = mix(dark_color, light_color, diffuse_term) * 0.20;
// the shaded cel has a light value of 0.5, the light cel has a light value of 1
float cel_diffuse_term = smoothstep(0.49, 0.52, diffuse_term)/2 + 0.5;
//float cel_diffuse_term = step(0.5, diffuse_term)/2 + 0.5;
return vec4((cel_diffuse_term * Texel(diffuse, texture_coords).rgb) + ambient, Texel(texture, texture_coords).a);
//return vec4(ambient+Texel(diffuse, texture_coords).rgb/100, Texel(texture, texture_coords).a);
}
]]
local jg = jin.graphics
local effect = jg.Shader(shader)
local diffuse = jg.Image("treestump_diffuse.png")
local img = jg.Image("treestump.png")
jin.core.onEvent = function(e)
if e.type == "quit" then
jin.core.quit()
end
end
jin.core.onUpdate = function()
local mx, my = jin.mouse.position()
my = 400 - my
effect:send("number", "mx", mx)
effect:send("number", "my", my)
end
jin.core.onDraw = function()
effect:send("Image", "diffuse", diffuse);
jg.use(effect)
jg.draw(img, 250, 200, 5, 5)
end
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