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Trying out a new lighting model.

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This commit is contained in:
Joshua Yanovski 2020-04-04 02:32:39 +02:00
parent b0ac9f36f7
commit 8b149ad11a
9 changed files with 270 additions and 69 deletions
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36
assets/voxygen/shaders/figure-frag.glsl
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@ -28,19 +28,37 @@ uniform u_bones {
out vec4 tgt_color;
void main() {
vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
vec3 surf_color = /*srgb_to_linear*/(model_col.rgb * f_col);
vec3 k_a = surf_color;
vec3 k_d = 0.5 * surf_color;
vec3 k_s = 0.5 * surf_color;
float alpha = 2.0;
vec3 emitted_light, reflected_light;
float point_shadow = shadow_at(f_pos, f_norm);
diffuse_light *= point_shadow;
ambient_light *= point_shadow;
vec3 point_light = light_at(f_pos, f_norm);
light += point_light;
diffuse_light += point_light;
vec3 surf_color = illuminate(srgb_to_linear(model_col.rgb * f_col), light, diffuse_light, ambient_light);
// vec3 point_light = light_at(f_pos, f_norm);
// vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, k_a * point_shadow, k_d * point_shadow, k_s * point_shadow, alpha, emitted_light, reflected_light);
lights_at(f_pos, f_norm, cam_to_frag, k_a * point_shadow, k_d * point_shadow, k_s * point_shadow, alpha, emitted_light, reflected_light);
// get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, surf_color * f_light * point_shadow, 0.5 * surf_color * f_light * point_shadow, 0.5 * surf_color * f_light * point_shadow, 2.0, emitted_light, reflected_light);
// get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
// diffuse_light *= point_shadow;
// ambient_light *= point_shadow;
// vec3 point_light = light_at(f_pos, f_norm);
// light += point_light;
// diffuse_light += point_light;
// reflected_light += point_light;
// vec3 surf_color = illuminate(srgb_to_linear(model_col.rgb * f_col), light, diffuse_light, ambient_light);
surf_color = illuminate(emitted_light, reflected_light);
float fog_level = fog(f_pos.xyz, focus_pos.xyz, medium.x);
vec4 clouds;
vec3 fog_color = get_sky_color(normalize(f_pos - cam_pos.xyz), time_of_day.x, cam_pos.xyz, f_pos, 0.5, true, clouds);
vec3 fog_color = get_sky_color(cam_to_frag, time_of_day.x, cam_pos.xyz, f_pos, 0.5, true, clouds);
vec3 color = mix(mix(surf_color, fog_color, fog_level), clouds.rgb, clouds.a);
tgt_color = vec4(color, 1.0);

34
assets/voxygen/shaders/fluid-frag/cheap.glsl
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@ -33,16 +33,31 @@ void main() {
vec3 f_norm = normals[norm_axis + norm_dir];
vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
vec3 surf_color = /*srgb_to_linear*/(vec3(0.4, 0.7, 2.0));
vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 0.0);
vec3 k_a = 0.5 * surf_color;
vec3 k_d = vec3(1.0);
vec3 k_s = 0.5 * vec3(1.0);
float alpha = 0.255;
vec3 emitted_light, reflected_light;
// float point_shadow = shadow_at(f_pos, f_norm);
// vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
// vec3 emitted_light, reflected_light;
// vec3 light, diffuse_light, ambient_light;
float point_shadow = shadow_at(f_pos,f_norm);
diffuse_light *= f_light * point_shadow;
ambient_light *= f_light, point_shadow;
vec3 point_light = light_at(f_pos, f_norm);
light += point_light;
diffuse_light += point_light;
vec3 surf_color = srgb_to_linear(vec3(0.4, 0.7, 2.0)) * light * diffuse_light * ambient_light;
// vec3 surf_color = /*srgb_to_linear*/(vec3(0.4, 0.7, 2.0));
get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, k_a * f_light * point_shadow, vec3(0.0), k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
// get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 0.0);
// diffuse_light *= f_light * point_shadow;
// ambient_light *= f_light, point_shadow;
// vec3 point_light = light_at(f_pos, f_norm);
// light += point_light;
// diffuse_light += point_light;
// reflected_light += point_light;
// vec3 surf_color = srgb_to_linear(vec3(0.4, 0.7, 2.0)) * light * diffuse_light * ambient_light;
lights_at(f_pos, f_norm, cam_to_frag, k_a * f_light * point_shadow, k_d * f_light * point_shadow, k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
float fog_level = fog(f_pos.xyz, focus_pos.xyz, medium.x);
vec4 clouds;
@ -50,7 +65,8 @@ void main() {
float passthrough = pow(dot(faceforward(f_norm, f_norm, cam_to_frag), -cam_to_frag), 0.5);
vec4 color = mix(vec4(surf_color, 1.0), vec4(surf_color, 1.0 / (1.0 + diffuse_light * 0.25)), passthrough);
surf_color = illuminate(emitted_light, reflected_light);
vec4 color = mix(vec4(surf_color, 1.0), vec4(surf_color, 1.0 / (1.0 + /*diffuse_light*//*(f_light * point_shadow + point_light)*/reflected_light * 0.25)), passthrough);
tgt_color = mix(mix(color, vec4(fog_color, 0.0), fog_level), vec4(clouds.rgb, 0.0), clouds.a);
}

57
assets/voxygen/shaders/fluid-frag/shiny.glsl
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@ -93,32 +93,51 @@ void main() {
vec3 norm = f_norm * nmap.z + b_norm * nmap.x + c_norm * nmap.y;
vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(norm, time_of_day.x, light, diffuse_light, ambient_light, 0.0);
float point_shadow = shadow_at(f_pos, norm);
diffuse_light *= f_light * point_shadow;
ambient_light *= f_light, point_shadow;
vec3 point_light = light_at(f_pos, norm);
light += point_light;
diffuse_light += point_light;
vec3 surf_color = srgb_to_linear(vec3(0.2, 0.5, 1.0)) * light * diffuse_light * ambient_light;
vec4 _clouds;
vec3 reflect_ray_dir = reflect(cam_to_frag, norm);
vec3 reflect_color = get_sky_color(reflect_ray_dir, time_of_day.x, f_pos, vec3(-100000), 0.25, false, _clouds) * f_light;
vec3 surf_color = /*srgb_to_linear*/(vec3(0.2, 0.5, 1.0));
vec3 k_a = surf_color;
vec3 k_d = vec3(1.0);
vec3 k_s = reflect_color;
float alpha = 0.255;
vec3 emitted_light, reflected_light;
// vec3 light, diffuse_light, ambient_light;
float point_shadow = shadow_at(f_pos,f_norm);
// 0 = 100% reflection, 1 = translucent water
float passthrough = pow(dot(faceforward(f_norm, f_norm, cam_to_frag), -cam_to_frag), 0.5);
get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, k_a * f_light * point_shadow, vec3(0.0), /*vec3(f_light * point_shadow)*//*reflect_color*/k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
lights_at(f_pos, f_norm, cam_to_frag, k_a * f_light * point_shadow, k_d * f_light * point_shadow, k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
// get_sun_diffuse(norm, time_of_day.x, light, diffuse_light, ambient_light, 0.0);
// diffuse_light *= f_light * point_shadow;
// ambient_light *= f_light * point_shadow;
// vec3 point_light = light_at(f_pos, norm);
// light += point_light;
// diffuse_light += point_light;
// reflected_light += point_light;
// vec3 surf_color = srgb_to_linear(vec3(0.2, 0.5, 1.0)) * light * diffuse_light * ambient_light;
surf_color = illuminate(emitted_light, reflected_light);
float fog_level = fog(f_pos.xyz, focus_pos.xyz, medium.x);
vec4 clouds;
vec3 fog_color = get_sky_color(normalize(f_pos - cam_pos.xyz), time_of_day.x, cam_pos.xyz, f_pos, 0.25, true, clouds);
vec3 fog_color = get_sky_color(cam_to_frag, time_of_day.x, cam_pos.xyz, f_pos, 0.25, true, clouds);
vec3 reflect_ray_dir = reflect(cam_to_frag, norm);
// vec3 reflect_ray_dir = reflect(cam_to_frag, norm);
// Hack to prevent the reflection ray dipping below the horizon and creating weird blue spots in the water
reflect_ray_dir.z = max(reflect_ray_dir.z, 0.01);
// reflect_ray_dir.z = max(reflect_ray_dir.z, 0.01);
vec4 _clouds;
vec3 reflect_color = get_sky_color(reflect_ray_dir, time_of_day.x, f_pos, vec3(-100000), 0.25, false, _clouds) * f_light;
// vec4 _clouds;
// vec3 reflect_color = get_sky_color(reflect_ray_dir, time_of_day.x, f_pos, vec3(-100000), 0.25, false, _clouds) * f_light;
// Tint
reflect_color = mix(reflect_color, surf_color, 0.6);
// 0 = 100% reflection, 1 = translucent water
float passthrough = pow(dot(faceforward(f_norm, f_norm, cam_to_frag), -cam_to_frag), 0.5);
// reflect_color = mix(reflect_color, surf_color, 0.6);
vec4 color = mix(vec4(reflect_color * 2.0, 1.0), vec4(surf_color, 1.0 / (1.0 + diffuse_light * 0.25)), passthrough);
tgt_color = mix(mix(color, vec4(fog_color, 0.0), fog_level), vec4(clouds.rgb, 0.0), clouds.a);
// vec4 color = mix(vec4(reflect_color * 2.0, 1.0), vec4(surf_color, 1.0 / (1.0 + /*diffuse_light*/(f_light * point_shadow + point_light) * 0.25)), passthrough);
vec4 color = vec4(surf_color, 1.0 / (1.0 + /*diffuse_light*/(/*f_light * point_shadow + point_light*/reflected_light) * 0.25));
// vec4 color = surf_color;
tgt_color = color; // mix(mix(color, vec4(fog_color, 0.0), fog_level), vec4(clouds.rgb, 0.0), clouds.a);
}

53
assets/voxygen/shaders/include/light.glsl
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@ -70,3 +70,56 @@ float shadow_at(vec3 wpos, vec3 wnorm) {
}
return min(shadow, 1.0);
}
void lights_at(vec3 wpos, vec3 wnorm, vec3 cam_to_frag, vec3 k_a, vec3 k_d, vec3 k_s, float alpha, inout vec3 emitted_light, inout vec3 reflected_light/*, out float shadow*/) {
// shadow = 0.0;
vec3 ambient_light = vec3(0.0);
const float LIGHT_AMBIENCE = 0.025;
for (uint i = 0u; i < light_shadow_count.x; i ++) {
// Only access the array once
Light L = lights[i];
vec3 light_pos = L.light_pos.xyz;
// Pre-calculate difference between light and fragment
vec3 difference = light_pos - wpos;
float strength = pow(attenuation_strength(difference), 0.6);
// Multiply the vec3 only once
vec3 color = /*srgb_to_linear*/(L.light_col.rgb) * (strength * L.light_col.a);
// // Only access the array once
// Shadow S = shadows[i];
// vec3 shadow_pos = S.shadow_pos_radius.xyz;
// float radius = S.shadow_pos_radius.w;
// vec3 diff = shadow_pos - wpos;
// if (diff.z >= 0.0) {
// diff.z = -sign(diff.z) * diff.z * 0.1;
// }
// float shade = max(pow(diff.x * diff.x + diff.y * diff.y + diff.z * diff.z, 0.25) / pow(radius * radius * 0.5, 0.25), /*0.5*/0.0);
// shadow = min(shadow, shade);
// Compute reflectance.
vec3 light_dir = normalize(-difference);
reflected_light += color * light_reflection_factor(wnorm, cam_to_frag, light_dir, k_d, k_s, alpha);
// light += color * (max(0, max(dot(normalize(difference), wnorm), 0.15)) + LIGHT_AMBIENCE);
// Compute emiittance.
// float ambient_sides = clamp(mix(0.15, 0.0, abs(dot(wnorm, light_dir)) * 10000.0), 0.0, 0.15);
float ambient_sides = max(dot(wnorm, light_dir) - 0.15, 0.15);
// float ambient_sides = 0.0;
ambient_light += color * (ambient_sides + LIGHT_AMBIENCE);
}
// shadow = shadow_at(wpos, wnorm);
// float shadow = shadow_at(wpos, wnorm);
emitted_light += k_a * ambient_light/* * shadow*/;// min(shadow, 1.0);
}

41
assets/voxygen/shaders/include/sky.glsl
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@ -1,4 +1,5 @@
#include <random.glsl>
#include <srgb.glsl>
#include <cloud.glsl>
const float PI = 3.141592;
@ -36,7 +37,7 @@ vec3 get_moon_dir(float time_of_day) {
return normalize(-vec3(sin(moon_angle_rad), 0.0, cos(moon_angle_rad) - 0.5));
}
const float PERSISTENT_AMBIANCE = 0.1;
const float PERSISTENT_AMBIANCE = 0.025; // 0.1;
float get_sun_brightness(vec3 sun_dir) {
return max(-sun_dir.z + 0.6, 0.0) * 0.9;
@ -62,7 +63,18 @@ vec3 get_moon_color(vec3 moon_dir) {
return vec3(0.05, 0.05, 0.6);
}
void get_sun_diffuse(vec3 norm, float time_of_day, out vec3 light, out vec3 diffuse_light, out vec3 ambient_light, float diffusion) {
// Calculates extra emission and reflectance (due to sunlight / moonlight).
//
// reflectence = k_a * i_a + i_a,persistent
// emittence = Σ { m ∈ lights } i_m * shadow_m * get_light_reflected(light_m)
//
// Note that any shadowing to be done that would block the sun and moon, aside from heightmap shadowing (that will be
// implemented sooon), should be implicitly provided via k_a, k_d, and k_s. For instance, shadowing via ambient occlusion.
//
// Also note that the emitted light calculation is kind of lame... we probabbly need something a bit nicer if we ever want to do
// anything interesting here.
// void get_sun_diffuse(vec3 norm, float time_of_day, out vec3 light, out vec3 diffuse_light, out vec3 ambient_light, float diffusion
void get_sun_diffuse(vec3 norm, float time_of_day, vec3 dir, vec3 k_a, vec3 k_d, vec3 k_s, float alpha, out vec3 emitted_light, out vec3 reflected_light) {
const float SUN_AMBIANCE = 0.1;
vec3 sun_dir = get_sun_dir(time_of_day);
@ -77,12 +89,26 @@ void get_sun_diffuse(vec3 norm, float time_of_day, out vec3 light, out vec3 diff
vec3 sun_chroma = sun_color * sun_light;
vec3 moon_chroma = moon_color * moon_light;
light = sun_chroma + moon_chroma + PERSISTENT_AMBIANCE;
/* float NLsun = max(dot(-norm, sun_dir), 0);
float NLmoon = max(dot(-norm, moon_dir), 0);
vec3 E = -dir; */
// Globbal illumination "estimate" used to light the faces of voxels which are parallel to the sun or moon (which is a very common occurrence).
// Will be attenuated by k_d, which is assumed to carry any additional ambient occlusion information (e.g. about shadowing).
float ambient_sides = clamp(mix(0.5, 0.0, abs(dot(-norm, sun_dir)) * 10000.0), 0.0, 0.5);
emitted_light = k_a * (ambient_sides + vec3(SUN_AMBIANCE * sun_light + moon_light)) + PERSISTENT_AMBIANCE;
// TODO: Add shadows.
reflected_light =
sun_chroma * light_reflection_factor(norm, dir, sun_dir, k_d, k_s, alpha) +
moon_chroma * 0.0 * /*4.0 * */light_reflection_factor(norm, dir, moon_dir, k_d, k_s, alpha);
/* light = sun_chroma + moon_chroma + PERSISTENT_AMBIANCE;
diffuse_light =
sun_chroma * mix(1.0, max(dot(-norm, sun_dir) * 0.5 + 0.5, 0.0), diffusion) +
moon_chroma * mix(1.0, pow(dot(-norm, moon_dir) * 2.0, 2.0), diffusion) +
PERSISTENT_AMBIANCE;
ambient_light = vec3(SUN_AMBIANCE * sun_light + moon_light);
ambient_light = vec3(SUN_AMBIANCE * sun_light + moon_light); */
}
// This has been extracted into a function to allow quick exit when detecting a star.
@ -215,7 +241,12 @@ float fog(vec3 f_pos, vec3 focus_pos, uint medium) {
return pow(clamp((max(fog, mist) - min_fog) / (max_fog - min_fog), 0.0, 1.0), 1.7);
}
vec3 illuminate(vec3 color, vec3 light, vec3 diffuse, vec3 ambience) {
/* vec3 illuminate(vec3 color, vec3 light, vec3 diffuse, vec3 ambience) {
float avg_col = (color.r + color.g + color.b) / 3.0;
return ((color - avg_col) * light + (diffuse + ambience) * avg_col) * (diffuse + ambience);
} */
vec3 illuminate(vec3 emitted, vec3 reflected) {
const float gamma = /*0.5*/1.0;//1.0;
vec3 color = emitted + reflected;
return srgb_to_linear(/*0.5*//*0.125 * */vec3(pow(color.x, gamma), pow(color.y, gamma), pow(color.z, gamma)));
}

13
assets/voxygen/shaders/include/srgb.glsl
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@ -6,3 +6,16 @@ vec3 srgb_to_linear(vec3 srgb) {
return mix(higher, lower, cutoff);
}
// Phong reflection.
//
// Note: norm, dir, light_dir must all be normalizd.
vec3 light_reflection_factor(vec3 norm, vec3 dir, vec3 light_dir, vec3 k_d, vec3 k_s, float alpha) {
float ndotL = max(dot(-norm, light_dir), 0.0);
if (ndotL > 0.0) {
vec3 H = normalize(-light_dir + dir);
// (k_d * (L ⋅ N) + k_s * (R ⋅ V)^α)
return k_d * ndotL + k_s * pow(max(dot(norm, H), 0.0), alpha * 4.0);
}
return vec3(0.0);
}

15
assets/voxygen/shaders/lod-terrain-frag.glsl
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@ -16,19 +16,24 @@ void main() {
vec3 f_col = lod_col(f_pos.xy);
vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
vec3 surf_color = illuminate(f_col, light, diffuse_light, ambient_light);
vec3 emitted_light, reflected_light;
vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
// vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, f_col, 0.5 * f_col, 0.5 * vec3(1.0), 2.0, emitted_light, reflected_light);
// vec3 light, diffuse_light, ambient_light;
// get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
// vec3 surf_color = illuminate(f_col, light, diffuse_light, ambient_light);
vec3 surf_color = illuminate(emitted_light, reflected_light);
float fog_level = fog(f_pos.xyz, focus_pos.xyz, medium.x);
vec4 clouds;
vec3 fog_color = get_sky_color(normalize(f_pos - cam_pos.xyz), time_of_day.x, cam_pos.xyz, f_pos, 1.0, true, clouds);
vec3 fog_color = get_sky_color(cam_to_frag, time_of_day.x, cam_pos.xyz, f_pos, 1.0, true, clouds);
vec3 color = mix(mix(surf_color, fog_color, fog_level), clouds.rgb, clouds.a);
float mist_factor = max(1 - (f_pos.z + (texture(t_noise, f_pos.xy * 0.0005 + time_of_day.x * 0.0003).x - 0.5) * 128.0) / 400.0, 0.0);
//float mist_factor = f_norm.z * 2.0;
color = mix(color, vec3(1.0) * diffuse_light, clamp(mist_factor * 0.00005 * distance(f_pos.xy, focus_pos.xy), 0, 0.3));
color = mix(color, vec3(1.0) * /*diffuse_light*/reflected_light, clamp(mist_factor * 0.00005 * distance(f_pos.xy, focus_pos.xy), 0, 0.3));
tgt_color = vec4(color, 1.0);
}

38
assets/voxygen/shaders/sprite-frag.glsl
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@ -16,19 +16,39 @@ const float RENDER_DIST = 112.0;
const float FADE_DIST = 32.0;
void main() {
vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
vec3 surf_color = /*srgb_to_linear*/(f_col);
vec3 k_a = surf_color;
vec3 k_d = 0.5 * surf_color;
vec3 k_s = 0.5 * surf_color;
float alpha = 2.0;
vec3 emitted_light, reflected_light;
float point_shadow = shadow_at(f_pos, f_norm);
diffuse_light *= f_light * point_shadow;
ambient_light *= f_light, point_shadow;
vec3 point_light = light_at(f_pos, f_norm);
light += point_light;
diffuse_light += point_light;
vec3 surf_color = illuminate(f_col, light, diffuse_light, ambient_light);
// vec3 light, diffuse_light, ambient_light;
// vec3 emitted_light, reflected_light;
// float point_shadow = shadow_at(f_pos,f_norm);
// vec3 point_light = light_at(f_pos, f_norm);
// vec3 surf_color = srgb_to_linear(vec3(0.2, 0.5, 1.0));
// vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, k_a * f_light * point_shadow, k_d * f_light * point_shadow, k_s * f_light * point_shadow, 2.0, emitted_light, reflected_light);
// get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
// float point_shadow = shadow_at(f_pos, f_norm);
// diffuse_light *= f_light * point_shadow;
// ambient_light *= f_light * point_shadow;
// light += point_light;
// diffuse_light += point_light;
// reflected_light += point_light;
lights_at(f_pos, f_norm, cam_to_frag, k_a * f_light * point_shadow, k_d * f_light * point_shadow, k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
surf_color = illuminate(emitted_light, reflected_light);
// vec3 surf_color = illuminate(f_col, light, diffuse_light, ambient_light);
float fog_level = fog(f_pos.xyz, focus_pos.xyz, medium.x);
vec4 clouds;
vec3 fog_color = get_sky_color(normalize(f_pos - cam_pos.xyz), time_of_day.x, cam_pos.xyz, f_pos, 0.5, true, clouds);
vec3 fog_color = get_sky_color(cam_to_frag, time_of_day.x, cam_pos.xyz, f_pos, 0.5, true, clouds);
vec3 color = mix(mix(surf_color, fog_color, fog_level), clouds.rgb, clouds.a);
tgt_color = vec4(color, 1.0 - clamp((distance(focus_pos.xy, f_pos.xy) - (RENDER_DIST - FADE_DIST)) / FADE_DIST, 0, 1));

46
assets/voxygen/shaders/terrain-frag.glsl
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@ -23,20 +23,46 @@ void main() {
// Use an array to avoid conditional branching
vec3 f_norm = normals[(f_pos_norm >> 29) & 0x7u];
vec3 light, diffuse_light, ambient_light;
get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
vec3 cam_to_frag = normalize(f_pos - cam_pos.xyz);
vec3 surf_color = /*srgb_to_linear*/(f_col);
vec3 k_a = 0.5 * surf_color;
vec3 k_d = 0.5 * surf_color;
vec3 k_s = 0.5 * surf_color;
float alpha = 2.0;
vec3 emitted_light, reflected_light;
float point_shadow = shadow_at(f_pos, f_norm);
diffuse_light *= f_light * point_shadow;
ambient_light *= f_light * point_shadow;
vec3 point_light = light_at(f_pos, f_norm);
light += point_light;
diffuse_light += point_light;
vec3 surf_color = illuminate(srgb_to_linear(f_col), light, diffuse_light, ambient_light);
get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, k_a * f_light * point_shadow, k_d * f_light * point_shadow, k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
lights_at(f_pos, f_norm, cam_to_frag, k_a * f_light * point_shadow, k_d * f_light * point_shadow, k_s * f_light * point_shadow, alpha, emitted_light, reflected_light);
// float point_shadow = shadow_at(f_pos, f_norm);
// vec3 point_light = light_at(f_pos, f_norm);
// vec3 light, diffuse_light, ambient_light;
// get_sun_diffuse(f_norm, time_of_day.x, cam_to_frag, k_a * f_light, k_d * f_light, k_s * f_light, alpha, emitted_light, reflected_light);
// get_sun_diffuse(f_norm, time_of_day.x, light, diffuse_light, ambient_light, 1.0);
// float point_shadow = shadow_at(f_pos, f_norm);
// diffuse_light *= f_light * point_shadow;
// ambient_light *= f_light * point_shadow;
// vec3 point_light = light_at(f_pos, f_norm);
// light += point_light;
// diffuse_light += point_light;
// reflected_light += point_light;
// reflected_light += light_reflection_factor(norm, cam_to_frag, , vec3 k_d, vec3 k_s, float alpha) {
// light_reflection_factorplight_reflection_factor
// vec3 surf_color = illuminate(srgb_to_linear(f_col), light, diffuse_light, ambient_light);
surf_color = illuminate(emitted_light, reflected_light);
float fog_level = fog(f_pos.xyz, focus_pos.xyz, medium.x);
vec4 clouds;
vec3 fog_color = get_sky_color(normalize(f_pos - cam_pos.xyz), time_of_day.x, cam_pos.xyz, f_pos, 1.0, true, clouds);
vec3 color = mix(mix(surf_color, fog_color, fog_level), clouds.rgb, clouds.a);
vec3 fog_color = get_sky_color(cam_to_frag, time_of_day.x, cam_pos.xyz, f_pos, 1.0, true, clouds);
vec3 color = surf_color;
// vec3 color = mix(mix(surf_color, fog_color, fog_level), clouds.rgb, clouds.a);
tgt_color = vec4(color, 1.0);
}