515 lines
16 KiB
C++
515 lines
16 KiB
C++
// -*-C++-*-
|
|
#version 120
|
|
|
|
// written by Thorsten Renk, Oct 2011, based on default.frag
|
|
// Ambient term comes in gl_Color.rgb.
|
|
varying vec4 diffuse_term;
|
|
varying vec3 normal;
|
|
varying vec3 relPos;
|
|
varying vec2 rawPos;
|
|
varying vec3 ecViewdir;
|
|
varying vec4 ecPosition;
|
|
|
|
|
|
uniform sampler2D texture;
|
|
uniform sampler2D NormalTex;
|
|
uniform sampler2D mix_texture;
|
|
uniform sampler2D grain_texture;
|
|
|
|
varying float steepness;
|
|
|
|
|
|
uniform float visibility;
|
|
uniform float avisibility;
|
|
uniform float scattering;
|
|
uniform float terminator;
|
|
uniform float terrain_alt;
|
|
uniform float hazeLayerAltitude;
|
|
uniform float overcast;
|
|
uniform float eye_alt;
|
|
uniform float snowlevel;
|
|
uniform float dust_cover_factor;
|
|
uniform float lichen_cover_factor;
|
|
uniform float filter_threshold;
|
|
uniform float filter_transition;
|
|
uniform float size_base;
|
|
uniform float size_overlay;
|
|
uniform float size_grain;
|
|
uniform float strength_05m;
|
|
uniform float strength_1m;
|
|
uniform float strength_2m;
|
|
uniform float strength_5m;
|
|
uniform float strength_10m;
|
|
uniform float relief_strength;
|
|
uniform float grain_strength;
|
|
uniform float bias_center_strength;
|
|
uniform float wetness;
|
|
uniform float fogstructure;
|
|
uniform float snow_thickness_factor;
|
|
uniform float cloud_self_shading;
|
|
uniform float landing_light1_offset;
|
|
uniform float landing_light2_offset;
|
|
uniform float landing_light3_offset;
|
|
uniform float air_pollution;
|
|
|
|
|
|
uniform int quality_level;
|
|
uniform int tquality_level;
|
|
uniform int cloud_shadow_flag;
|
|
uniform int bias_center;
|
|
uniform int use_searchlight;
|
|
uniform int use_landing_light;
|
|
uniform int use_alt_landing_light;
|
|
|
|
const float EarthRadius = 5800000.0;
|
|
const float terminator_width = 200000.0;
|
|
|
|
float alt;
|
|
float eShade;
|
|
float yprime_alt;
|
|
float mie_angle;
|
|
|
|
|
|
float shadow_func (in float x, in float y, in float noise, in float dist);
|
|
float Noise2D(in vec2 coord, in float wavelength);
|
|
float fog_func (in float targ, in float alt);
|
|
float alt_factor(in float eye_alt, in float vertex_alt);
|
|
float light_distance_fading(in float dist);
|
|
float fog_backscatter(in float avisibility);
|
|
float rayleigh_in_func(in float dist, in float air_pollution, in float avisibility, in float eye_alt, in float vertex_alt);
|
|
|
|
vec3 searchlight();
|
|
vec3 landing_light(in float offset, in float offsetv);
|
|
vec3 rayleigh_out_shift(in vec3 color, in float outscatter);
|
|
vec3 get_hazeColor(in float light_arg);
|
|
vec3 filter_combined (in vec3 color) ;
|
|
|
|
float getShadowing();
|
|
vec3 getClusteredLightsContribution(vec3 p, vec3 n, vec3 texel);
|
|
|
|
|
|
void main()
|
|
{
|
|
|
|
|
|
|
|
yprime_alt = diffuse_term.a;
|
|
//diffuse_term.a = 1.0;
|
|
mie_angle = gl_Color.a;
|
|
float effective_scattering = min(scattering, cloud_self_shading);
|
|
|
|
// distance to fragment
|
|
float dist = length(relPos);
|
|
// angle of view vector with horizon
|
|
float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist;
|
|
|
|
|
|
vec3 shadedFogColor = vec3(0.55, 0.67, 0.88);
|
|
// this is taken from default.frag
|
|
vec3 n;
|
|
float NdotL, NdotHV, fogFactor;
|
|
vec4 color = gl_Color;
|
|
color.a = 1.0;
|
|
vec3 lightDir = gl_LightSource[0].position.xyz;
|
|
vec3 halfVector;
|
|
if (quality_level<6)
|
|
{halfVector = gl_LightSource[0].halfVector.xyz;}
|
|
else
|
|
{halfVector = normalize(normalize(lightDir) + normalize(ecViewdir));}
|
|
|
|
vec4 texel;
|
|
vec4 snow_texel;
|
|
vec4 mix_texel;
|
|
vec4 grain_texel;
|
|
vec4 fragColor;
|
|
vec4 specular = vec4(0.0);
|
|
float intensity;
|
|
|
|
|
|
// get noise at different wavelengths
|
|
|
|
// used: 5m, 5m gradient, 10m, 10m gradient: heightmap of the closeup terrain, 10m also snow
|
|
// 50m: detail texel
|
|
// 250m: detail texel
|
|
// 500m: distortion and overlay
|
|
// 1500m: overlay, detail, dust, fog
|
|
// 2000m: overlay, detail, snow, fog
|
|
|
|
float noise_01m;
|
|
float noise_05m = Noise2D(rawPos.xy, 0.5);
|
|
float noise_1m = Noise2D(rawPos.xy, 1.0);
|
|
float noise_2m = Noise2D(rawPos.xy, 2.0);
|
|
float noise_10m = Noise2D(rawPos.xy, 10.0);
|
|
float noise_5m = Noise2D(rawPos.xy ,5.0);
|
|
|
|
|
|
float noisegrad_10m;
|
|
float noisegrad_5m;
|
|
|
|
float noise_50m = Noise2D(rawPos.xy, 50.0);;
|
|
float noise_250m;
|
|
float noise_500m = Noise2D(rawPos.xy, 500.0);
|
|
float noise_1500m = Noise2D(rawPos.xy, 1500.0);
|
|
float noise_2000m = Noise2D(rawPos.xy, 2000.0);
|
|
|
|
|
|
|
|
|
|
|
|
//
|
|
|
|
|
|
// get the texels
|
|
|
|
//texel = texture2D(texture, gl_TexCoord[0].st);
|
|
//mix_texel = texture2D(mix_texture, gl_TexCoord[0].st * 5.0);
|
|
texel = texture2D(texture, rawPos * 1.0/size_base);
|
|
mix_texel = texture2D(mix_texture, rawPos * 1.0/size_overlay);
|
|
grain_texel = texture2D(grain_texture, rawPos * 1.0/size_grain);
|
|
vec4 nmap = texture2D(NormalTex, gl_TexCoord[0].st * 8.0);
|
|
//vec4 nmap = texture2D(NormalTex, rawPos * 0.01);
|
|
vec3 N = nmap.rgb * 2.0 - 1.0;
|
|
|
|
float distortion_factor = 1.0;
|
|
vec2 stprime;
|
|
int flag = 1;
|
|
int mix_flag = 1;
|
|
float noise_term;
|
|
float snow_alpha;
|
|
|
|
|
|
//noise_term = smoothstep(overlay_limit ,1.0,noise_1m);
|
|
//noise_term = smoothstep(overlay_limit, 1.0, 0.5 * noise_1m + 0.5 * noise_10m);
|
|
noise_term = strength_05m * noise_05m;
|
|
noise_term += strength_1m * noise_1m;
|
|
noise_term += strength_2m * noise_2m;
|
|
noise_term += strength_5m * noise_5m;
|
|
noise_term += strength_10m * noise_10m;
|
|
|
|
|
|
|
|
if (bias_center == 1)
|
|
{
|
|
float centerness = smoothstep(0.02, 0.1, (0.14 - abs(gl_TexCoord[0].s - 0.14)));
|
|
centerness *= smoothstep(0.05, 0.15, gl_TexCoord[0].t);
|
|
centerness = 1.0 - centerness;
|
|
|
|
noise_term *= (1.0 - bias_center_strength) + bias_center_strength * centerness;
|
|
noise_term = clamp(noise_term, 0.0, 1.0);
|
|
}
|
|
|
|
float filtered_noise_term = smoothstep(filter_threshold, filter_threshold + filter_transition, noise_term);
|
|
|
|
texel = mix(texel, mix_texel, filtered_noise_term);
|
|
|
|
texel.rgb = mix(texel.rgb, grain_texel.rgb, grain_strength * grain_texel.a * (1.0 - noise_term));// * (1.0-smoothstep(2000.0,5000.0, dist)));
|
|
|
|
|
|
|
|
//float view_angle = abs(dot(normal, normalize(ecViewdir)));
|
|
|
|
//if ((quality_level > 3)&&(relPos.z + eye_alt +500.0 > snowlevel))
|
|
if (quality_level > 3)
|
|
{
|
|
float sfactor;
|
|
noise_01m = Noise2D(rawPos.xy,0.1);
|
|
snow_texel = vec4 (0.95, 0.95, 0.95, 1.0) * (0.9 + 0.1* noise_50m + 0.1* (1.0 - noise_10m) );
|
|
snow_texel.a = 1.0;
|
|
noise_term = 0.1 * (noise_50m-0.5);
|
|
sfactor = 1.0;//sqrt(2.0 * (1.0-steepness)/0.03) + abs(ct)/0.15;
|
|
noise_term = noise_term + 0.2 * (noise_10m -0.5) * (1.0 - smoothstep(10000.0*sfactor, 16000.0*sfactor, dist) ) ;
|
|
noise_term = noise_term + 0.3 * (noise_5m -0.5) * (1.0 - smoothstep(1200.0 * sfactor, 2000.0 * sfactor, dist) ) ;
|
|
noise_term = noise_term + 0.3 * (noise_1m -0.5) * (1.0 - smoothstep(500.0 * sfactor, 1000.0 *sfactor, dist) );
|
|
noise_term = noise_term + 0.3 * (noise_01m -0.5) * (1.0 - smoothstep(20.0 * sfactor, 100.0 *sfactor, dist) );
|
|
snow_texel.a = snow_texel.a * 0.2+0.8* smoothstep(0.2,0.8, 0.3 +noise_term + 0.2*snow_thickness_factor +0.0001*(relPos.z +eye_alt -snowlevel) );
|
|
|
|
}
|
|
|
|
|
|
const vec4 dust_color = vec4 (0.76, 0.71, 0.56, 1.0);
|
|
const vec4 lichen_color = vec4 (0.17, 0.20, 0.06, 1.0);;
|
|
//float snow_alpha;
|
|
|
|
if (quality_level > 3)
|
|
{
|
|
|
|
// mix vegetation
|
|
texel = mix(texel, lichen_color, 0.4 * lichen_cover_factor + 0.8 * lichen_cover_factor * 0.5 * (noise_10m + (1.0 - noise_5m)) );
|
|
// mix dust
|
|
texel = mix(texel, dust_color, clamp(0.5 * dust_cover_factor + 3.0 * dust_cover_factor * (((noise_1500m - 0.5) * 0.125)+0.125 ),0.0, 1.0) );
|
|
|
|
// mix snow
|
|
if (relPos.z + eye_alt +500.0 > snowlevel)
|
|
{
|
|
snow_alpha = smoothstep(0.75, 0.85, abs(steepness));
|
|
texel = mix(texel, snow_texel, snow_texel.a* smoothstep(snowlevel, snowlevel+200.0, snow_alpha * (relPos.z + eye_alt)+ (noise_2000m + 0.1 * noise_10m -0.55) *400.0));
|
|
}
|
|
}
|
|
else if (relPos.z + eye_alt +500.0 > snowlevel)
|
|
{
|
|
float snow_alpha = 0.5+0.5* smoothstep(0.2,0.8, 0.3 + snow_thickness_factor +0.0001*(relPos.z +eye_alt -snowlevel) );
|
|
// texel = vec4(dot(vec3(0.2989, 0.5870, 0.1140), texel.rgb));
|
|
texel = mix(texel, vec4(1.0), snow_alpha* smoothstep(snowlevel, snowlevel+200.0, (relPos.z + eye_alt)));
|
|
}
|
|
|
|
|
|
|
|
// get distribution of water when terrain is wet
|
|
|
|
float water_threshold1;
|
|
float water_threshold2;
|
|
float water_factor =0.0;
|
|
|
|
|
|
if ((dist < 5000.0)&& (quality_level > 3) && (wetness>0.0))
|
|
{
|
|
water_threshold1 = 1.0-0.5* wetness;
|
|
water_threshold2 = 1.0 - 0.3 * wetness;
|
|
//water_factor = smoothstep(water_threshold1, water_threshold2 , (0.3 * (2.0 * (1.0-noise_10m) + (1.0 -noise_5m)) * (1.0 - smoothstep(2000.0, 5000.0, dist))) - 5.0 * (1.0 -steepness));
|
|
water_factor = smoothstep(water_threshold1, water_threshold2 , 0.5 * (noise_5m + (1.0 -noise_1m))) * (1.0 - smoothstep(1000.0, 3000.0, dist));
|
|
}
|
|
|
|
// darken wet terrain
|
|
|
|
texel.rgb = texel.rgb * (1.0 - 0.6 * wetness - 0.1 * water_factor);
|
|
|
|
|
|
// light computations
|
|
|
|
|
|
vec4 light_specular = gl_LightSource[0].specular;
|
|
|
|
// If gl_Color.a == 0, this is a back-facing polygon and the
|
|
// normal should be reversed.
|
|
//n = (2.0 * gl_Color.a - 1.0) * normal;
|
|
n = normal;//vec3 (nvec.x, nvec.y, sqrt(1.0 -pow(nvec.x,2.0) - pow(nvec.y,2.0) ));
|
|
n = normalize(n);
|
|
|
|
NdotL = dot(n, lightDir);
|
|
|
|
if (quality_level > 4)
|
|
{
|
|
NdotL = NdotL + (3.0 * N.r + 0.1 * (noise_01m-0.5))* (1.0 - water_factor) * relief_strength;
|
|
//NdotL = NdotL + 3.0 * N.r + 0.1 * (noise_01m-0.5) ;
|
|
}
|
|
if (NdotL > 0.0) {
|
|
float shadowmap = getShadowing();
|
|
if (cloud_shadow_flag == 1)
|
|
{NdotL = NdotL * shadow_func(relPos.x, relPos.y, 1.0, dist);}
|
|
color += diffuse_term * NdotL * shadowmap;
|
|
NdotHV = max(dot(n, halfVector), 0.0);
|
|
//if (gl_FrontMaterial.shininess > 0.0)
|
|
specular.rgb = ((gl_FrontMaterial.specular.rgb + (water_factor * vec3 (1.0, 1.0, 1.0)))
|
|
* light_specular.rgb
|
|
* pow(NdotHV, gl_FrontMaterial.shininess + (20.0 * water_factor))
|
|
* shadowmap);
|
|
}
|
|
color.a = 1.0;//diffuse_term.a;
|
|
// This shouldn't be necessary, but our lighting becomes very
|
|
// saturated. Clamping the color before modulating by the texture
|
|
// is closer to what the OpenGL fixed function pipeline does.
|
|
color = clamp(color, 0.0, 1.0);
|
|
|
|
vec3 secondary_light = vec3 (0.0,0.0,0.0);
|
|
|
|
if (use_searchlight == 1)
|
|
{
|
|
secondary_light.rgb += searchlight();
|
|
}
|
|
if (use_landing_light == 1)
|
|
{
|
|
secondary_light += landing_light(landing_light1_offset, landing_light3_offset);
|
|
}
|
|
if (use_alt_landing_light == 1)
|
|
{
|
|
secondary_light += landing_light(landing_light2_offset, landing_light3_offset);
|
|
}
|
|
color.rgb +=secondary_light * light_distance_fading(dist);
|
|
|
|
fragColor = color * texel + specular;
|
|
fragColor.rgb += getClusteredLightsContribution(ecPosition.xyz, n, texel.rgb);
|
|
|
|
float lightArg = (terminator-yprime_alt)/100000.0;
|
|
|
|
vec3 hazeColor = get_hazeColor(lightArg);
|
|
|
|
|
|
// Rayleigh color shifts
|
|
|
|
if ((quality_level > 5) && (tquality_level > 5))
|
|
{
|
|
float rayleigh_length = 0.5 * avisibility * (2.5 - 1.9 * air_pollution)/alt_factor(eye_alt, eye_alt+relPos.z);
|
|
float outscatter = 1.0-exp(-dist/rayleigh_length);
|
|
fragColor.rgb = rayleigh_out_shift(fragColor.rgb,outscatter);
|
|
// Rayleigh color shift due to in-scattering
|
|
float rShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt + 420000.0);
|
|
float lightIntensity = length(hazeColor * effective_scattering) * rShade;
|
|
vec3 rayleighColor = vec3 (0.17, 0.52, 0.87) * lightIntensity;
|
|
float rayleighStrength = rayleigh_in_func(dist, air_pollution, avisibility/max(lightIntensity,0.05), eye_alt, eye_alt + relPos.z);
|
|
fragColor.rgb = mix(fragColor.rgb, rayleighColor,rayleighStrength);
|
|
}
|
|
|
|
|
|
// here comes the terrain haze model
|
|
|
|
float delta_z = hazeLayerAltitude - eye_alt;
|
|
float mvisibility = min(visibility, avisibility);
|
|
|
|
if (dist > 0.04 * mvisibility)
|
|
{
|
|
|
|
alt = eye_alt;
|
|
|
|
|
|
float transmission;
|
|
float vAltitude;
|
|
float delta_zv;
|
|
float H;
|
|
float distance_in_layer;
|
|
float transmission_arg;
|
|
|
|
|
|
|
|
|
|
// we solve the geometry what part of the light path is attenuated normally and what is through the haze layer
|
|
|
|
if (delta_z > 0.0) // we're inside the layer
|
|
{
|
|
if (ct < 0.0) // we look down
|
|
{
|
|
distance_in_layer = dist;
|
|
vAltitude = min(distance_in_layer,mvisibility) * ct;
|
|
delta_zv = delta_z - vAltitude;
|
|
}
|
|
else // we may look through upper layer edge
|
|
{
|
|
H = dist * ct;
|
|
if (H > delta_z) {distance_in_layer = dist/H * delta_z;}
|
|
else {distance_in_layer = dist;}
|
|
vAltitude = min(distance_in_layer,visibility) * ct;
|
|
delta_zv = delta_z - vAltitude;
|
|
}
|
|
}
|
|
else // we see the layer from above, delta_z < 0.0
|
|
{
|
|
H = dist * -ct;
|
|
if (H < (-delta_z)) // we don't see into the layer at all, aloft visibility is the only fading
|
|
{
|
|
distance_in_layer = 0.0;
|
|
delta_zv = 0.0;
|
|
}
|
|
else
|
|
{
|
|
vAltitude = H + delta_z;
|
|
distance_in_layer = vAltitude/H * dist;
|
|
vAltitude = min(distance_in_layer,visibility) * (-ct);
|
|
delta_zv = vAltitude;
|
|
}
|
|
}
|
|
|
|
|
|
// ground haze cannot be thinner than aloft visibility in the model,
|
|
// so we need to use aloft visibility otherwise
|
|
|
|
|
|
transmission_arg = (dist-distance_in_layer)/avisibility;
|
|
|
|
|
|
float eqColorFactor;
|
|
|
|
|
|
|
|
if (visibility < avisibility)
|
|
{
|
|
if (quality_level > 3)
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/(1.0 * visibility + 1.0 * visibility * fogstructure * 0.06 * (noise_1500m + noise_2000m -1.0) ));
|
|
|
|
}
|
|
else
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/visibility);
|
|
}
|
|
// this combines the Weber-Fechner intensity
|
|
eqColorFactor = 1.0 - 0.1 * delta_zv/visibility - (1.0 - effective_scattering);
|
|
|
|
}
|
|
else
|
|
{
|
|
if (quality_level > 3)
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/(1.0 * avisibility + 1.0 * avisibility * fogstructure * 0.06 * (noise_1500m + noise_2000m - 1.0) ));
|
|
}
|
|
else
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/avisibility);
|
|
}
|
|
// this combines the Weber-Fechner intensity
|
|
eqColorFactor = 1.0 - 0.1 * delta_zv/avisibility - (1.0 - effective_scattering);
|
|
}
|
|
|
|
transmission = fog_func(transmission_arg, alt);
|
|
|
|
// there's always residual intensity, we should never be driven to zero
|
|
if (eqColorFactor < 0.2) eqColorFactor = 0.2;
|
|
|
|
// now dim the light for haze
|
|
eShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt);
|
|
|
|
// Mie-like factor
|
|
|
|
if (lightArg < 10.0)
|
|
{
|
|
intensity = length(hazeColor);
|
|
float mie_magnitude = 0.5 * smoothstep(350000.0, 150000.0, terminator-sqrt(2.0 * EarthRadius * terrain_alt));
|
|
hazeColor = intensity * ((1.0 - mie_magnitude) + mie_magnitude * mie_angle) * normalize(mix(hazeColor, vec3 (0.5, 0.58, 0.65), mie_magnitude * (0.5 - 0.5 * mie_angle)) );
|
|
}
|
|
|
|
intensity = length(hazeColor);
|
|
|
|
if (intensity > 0.0) // this needs to be a condition, because otherwise hazeColor doesn't come out correctly
|
|
{
|
|
|
|
|
|
// high altitude desaturation of the haze color
|
|
hazeColor = intensity * normalize (mix(hazeColor, intensity * vec3 (1.0,1.0,1.0), 0.7* smoothstep(5000.0, 50000.0, alt)));
|
|
|
|
// blue hue of haze
|
|
hazeColor.x = hazeColor.x * 0.83;
|
|
hazeColor.y = hazeColor.y * 0.9;
|
|
|
|
|
|
// additional blue in indirect light
|
|
float fade_out = max(0.65 - 0.3 *overcast, 0.45);
|
|
intensity = length(hazeColor);
|
|
hazeColor = intensity * normalize(mix(hazeColor, 1.5* shadedFogColor, 1.0 -smoothstep(0.25, fade_out,eShade) ));
|
|
|
|
// change haze color to blue hue for strong fogging
|
|
hazeColor = intensity * normalize(mix(hazeColor, shadedFogColor, (1.0-smoothstep(0.5,0.9,eqColorFactor))));
|
|
|
|
|
|
|
|
// reduce haze intensity when looking at shaded surfaces, only in terminator region
|
|
float shadow = mix( min(1.0 + dot(n,lightDir),1.0), 1.0, 1.0-smoothstep(0.1, 0.4, transmission));
|
|
hazeColor = mix(shadow * hazeColor, hazeColor, 0.3 + 0.7* smoothstep(250000.0, 400000.0, terminator));
|
|
}
|
|
|
|
|
|
// don't let the light fade out too rapidly
|
|
lightArg = (terminator + 200000.0)/100000.0;
|
|
float minLightIntensity = min(0.2,0.16 * lightArg + 0.5);
|
|
vec3 minLight = minLightIntensity * vec3 (0.2, 0.3, 0.4);
|
|
|
|
hazeColor.rgb *= eqColorFactor * eShade;
|
|
hazeColor.rgb = max(hazeColor.rgb, minLight.rgb);
|
|
|
|
fragColor.rgb = mix(hazeColor +secondary_light * fog_backscatter(mvisibility) , fragColor.rgb,transmission);
|
|
|
|
}
|
|
|
|
fragColor.rgb = filter_combined(fragColor.rgb);
|
|
|
|
gl_FragColor = fragColor;
|
|
|
|
}
|
|
|