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29 lines
936 B
GLSL
29 lines
936 B
GLSL
const float PI = 3.141592;
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vec3 get_sky_color(vec3 dir, float time_of_day) {
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const float TIME_FACTOR = (PI * 2.0) / (3600.0 * 24.0);
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const vec3 SKY_TOP = vec3(0.1, 0.5, 1.0);
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const vec3 SKY_BOTTOM = vec3(0.025, 0.08, 0.2);
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const vec3 SUN_HALO_COLOR = vec3(1.0, 0.7, 0.5);
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const vec3 SUN_SURF_COLOR = vec3(1.0, 0.9, 0.35) * 200.0;
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float sun_angle_rad = time_of_day * TIME_FACTOR;
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vec3 sun_dir = vec3(sin(sun_angle_rad), 0.0, cos(sun_angle_rad));
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vec3 sun_halo = pow(max(dot(dir, sun_dir), 0.0), 8.0) * SUN_HALO_COLOR;
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vec3 sun_surf = pow(max(dot(dir, sun_dir) - 0.0045, 0.0), 1000.0) * SUN_SURF_COLOR;
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vec3 sun_light = sun_halo + sun_surf;
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return mix(SKY_BOTTOM, SKY_TOP, (dir.z + 1.0) / 2.0) + sun_light;
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}
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float fog(vec2 f_pos, vec2 cam_pos) {
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float dist = distance(f_pos, cam_pos) / view_distance.x;
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float min_fog = 0.5;
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float max_fog = 1.0;
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return clamp((dist - min_fog) / (max_fog - min_fog), 0.0, 1.0);
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}
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