1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
#version 330 core
in vec3 v_p;
in vec3 v_n;
in vec2 v_t;
in vec4 v_p_lightspace;
out vec4 f_color;
uniform vec3 u_cam;
uniform float u_fog_start;
uniform float u_fog_end;
uniform vec3 u_fog_color;
uniform vec3 u_sun;
uniform sampler2D u_diffuse;
uniform sampler2D u_shadow_depth;
uniform vec4 u_diffusion;
float calc_shadow(vec4 p_lightspace) {
// ref: https://learnopengl.com/Advanced-Lighting/Shadows/Shadow-Mapping
vec3 pcoord = (p_lightspace.xyz / p_lightspace.w) * 0.5f + 0.5f;
float closest_depth = texture(u_shadow_depth, pcoord.xy).r;
float current_depth = pcoord.z;
return current_depth - 0.0005f > closest_depth ? 1.0 : 0.0;
}
float calc_diffuse(vec4 a, vec2 uv)
{
float top = mix(a.x, a.y, uv.x);
float bottom = mix(a.w, a.z, uv.x);
return mix(bottom, top, uv.y);
}
void main()
{
vec4 diffuse = texture(u_diffuse, v_t);
float shadow = 1.0 - calc_shadow(v_p_lightspace);
vec3 sun_dir = normalize(u_sun);
if (dot(sun_dir, v_n) < 0) {
shadow = 0.0f;
}
//shadow -= dot()
//float shadow = 1.0 - calc_shadow2(v_p_lightspace, v_n, normalize(v_p - u_cam));
shadow *= 0.25;
shadow += 0.75;
diffuse.r *= shadow;
diffuse.g *= shadow;
diffuse.b *= shadow;
float diff = calc_diffuse(u_diffusion, v_t);
if (v_p.y > 0) {
diff = clamp(1.0f - v_p.y, 0.0f, 1.0f);
}
diff = pow(diff, 2.0f) * 0.25f;
diffuse.rgb -= diff;
float d = distance(v_p, u_cam);
float fog = clamp((d - u_fog_start) / max(u_fog_end - u_fog_start, 1e-6), 0.0f, 1.0f);
vec3 rgb = mix(diffuse.rgb, u_fog_color, fog);
f_color = vec4(rgb, 1.0f);
}
|
