679 lines
25 KiB
C
679 lines
25 KiB
C
// -*- mode: C; -*-
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// Licence: GPL v2
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// Authors: Frederic Bouvier and Gijs de Rooy
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// with major additions and revisions by
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// Emilian Huminiuc and Vivian Meazza 2011
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// ported to Atmospheric Light Scattering
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// by Thorsten Renk, 2013
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#version 120
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varying vec3 VBinormal;
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varying vec3 VNormal;
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varying vec3 VTangent;
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varying vec3 rawpos;
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varying vec3 reflVec;
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varying vec3 vViewVec;
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varying vec3 vertVec;
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varying float alpha;
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uniform sampler2D BaseTex;
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uniform sampler2D LightMapTex;
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uniform sampler2D NormalTex;
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uniform sampler2D ReflMapTex;
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uniform sampler2D ReflGradientsTex;
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uniform sampler3D ReflNoiseTex;
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uniform samplerCube Environment;
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uniform sampler2D GrainTex;
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uniform int dirt_enabled;
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uniform int dirt_multi;
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uniform int dirt_modulates_reflection;
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uniform int lightmap_enabled;
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uniform int lightmap_multi;
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uniform int nmap_dds;
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uniform int nmap_enabled;
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uniform int refl_enabled;
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uniform int refl_type;
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uniform int refl_map;
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uniform int grain_texture_enabled;
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uniform int darkmap_enabled;
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uniform int rain_enabled;
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uniform int cloud_shadow_flag;
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uniform int use_searchlight;
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uniform int use_landing_light;
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uniform int use_alt_landing_light;
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uniform int use_geo_light;
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uniform float amb_correction;
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uniform float dirt_b_factor;
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uniform float dirt_g_factor;
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uniform float dirt_r_factor;
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uniform float dirt_reflection_factor;
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uniform float lightmap_a_factor;
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uniform float lightmap_b_factor;
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uniform float lightmap_g_factor;
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uniform float lightmap_r_factor;
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uniform float nmap_tile;
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uniform float refl_correction;
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uniform float refl_fresnel;
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uniform float refl_noise;
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uniform float refl_rainbow;
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uniform float grain_magnification;
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uniform float wetness;
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uniform float rain_norm;
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uniform float darkmap_factor;
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uniform float delta_T;
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uniform float avisibility;
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uniform float cloud_self_shading;
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uniform float eye_alt;
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uniform float ground_scattering;
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uniform float hazeLayerAltitude;
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uniform float moonlight;
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uniform float overcast;
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uniform float scattering;
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uniform float terminator;
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uniform float terrain_alt;
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uniform float visibility;
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uniform float air_pollution;
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uniform float osg_SimulationTime;
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uniform float landing_light1_offset;
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uniform float landing_light2_offset;
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uniform float landing_light3_offset;
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uniform float geo_light_x;
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uniform float geo_light_y;
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uniform float geo_light_z;
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uniform float geo_light_radius;
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uniform float geo_ambience;
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// constants needed by the light and fog computations ###################################################
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const float EarthRadius = 5800000.0;
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const float terminator_width = 200000.0;
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uniform vec3 lightmap_r_color;
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uniform vec3 lightmap_g_color;
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uniform vec3 lightmap_b_color;
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uniform vec3 lightmap_a_color;
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uniform float geo_light_r;
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uniform float geo_light_g;
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uniform float geo_light_b;
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uniform vec3 dirt_r_color;
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uniform vec3 dirt_g_color;
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uniform vec3 dirt_b_color;
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float DotNoise2D(in vec2 coord, in float wavelength, in float fractionalMaxDotSize, in float dot_density);
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float shadow_func (in float x, in float y, in float noise, in float dist);
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float fog_func (in float targ, in float altitude);
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float rayleigh_in_func(in float dist, in float air_pollution, in float avisibility, in float eye_alt, in float vertex_alt);
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float alt_factor(in float eye_alt, in float vertex_alt);
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float light_distance_fading(in float dist);
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float fog_backscatter(in float avisibility);
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vec3 rayleigh_out_shift(in vec3 color, in float outscatter);
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vec3 get_hazeColor(in float lightArg);
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vec3 searchlight();
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vec3 landing_light(in float offset, in float offsetv);
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vec3 addLights(in vec3 color1, in vec3 color2);
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vec4 color_temperature (in float T);
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vec3 filter_combined (in vec3 color) ;
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vec3 moonlight_perception (in vec3 light) ;
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vec3 filter_combined (in vec3 color) ;
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float light_func (in float x, in float a, in float b, in float c, in float d, in float e)
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{
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if (x > 30.0) {return e;}
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if (x < -15.0) {return 0.0;}
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return e / pow((1.0 + a * exp(-b * (x-c)) ),(1.0/d));
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}
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void main (void)
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{
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vec4 texel = texture2D(BaseTex, gl_TexCoord[0].st);
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vec4 nmap = texture2D(NormalTex, gl_TexCoord[0].st * nmap_tile);
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vec4 reflmap = texture2D(ReflMapTex, gl_TexCoord[0].st);
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vec4 noisevec = texture3D(ReflNoiseTex, rawpos.xyz);
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vec4 lightmapTexel = texture2D(LightMapTex, gl_TexCoord[0].st);
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vec4 grainTexel;
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vec3 mixedcolor;
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vec3 N = vec3(0.0,0.0,1.0);
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float pf = 0.0;
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float pf1 = 0.0;
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///some generic light scattering parameters
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vec3 shadedFogColor = vec3(0.55, 0.67, 0.88);
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vec3 moonLightColor = vec3 (0.095, 0.095, 0.15) * moonlight;
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moonLightColor = moonlight_perception(moonLightColor);
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float alt = eye_alt;
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float effective_scattering = min(scattering, cloud_self_shading);
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/// BEGIN geometry for light
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vec3 up = (gl_ModelViewMatrix * vec4(0.0,0.0,1.0,0.0)).xyz;
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//vec4 worldPos3D = (osg_ViewMatrixInverse * vec4 (0.0,0.0,0.0, 1.0));
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//worldPos3D.a = 0.0;
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//vec3 up = (osg_ViewMatrix * worldPos3D).xyz;
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float dist = length(vertVec);
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float vertex_alt = max(100.0,dot(up, vertVec) + alt);
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float vertex_scattering = ground_scattering + (1.0 - ground_scattering) * smoothstep(hazeLayerAltitude -100.0, hazeLayerAltitude + 100.0, vertex_alt);
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vec3 lightHorizon = gl_LightSource[0].position.xyz - up * dot(up,gl_LightSource[0].position.xyz);
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float yprime = -dot(vertVec, lightHorizon);
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float yprime_alt = yprime - sqrt(2.0 * EarthRadius * vertex_alt);
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float lightArg = (terminator-yprime_alt)/100000.0;
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float earthShade = 0.6 * (1.0 - smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt)) + 0.4;
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float mie_angle;
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if (lightArg < 10.0)
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{mie_angle = (0.5 * dot(normalize(vertVec), normalize(gl_LightSource[0].position.xyz)) ) + 0.5;}
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else
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{mie_angle = 1.0;}
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float fog_vertex_alt = max(vertex_alt,hazeLayerAltitude);
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float fog_yprime_alt = yprime_alt;
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if (fog_vertex_alt > hazeLayerAltitude)
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{
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if (dist > 0.8 * avisibility)
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{
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fog_vertex_alt = mix(fog_vertex_alt, hazeLayerAltitude, smoothstep(0.8*avisibility, avisibility, dist));
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fog_yprime_alt = yprime -sqrt(2.0 * EarthRadius * fog_vertex_alt);
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}
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}
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else
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{
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fog_vertex_alt = hazeLayerAltitude;
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fog_yprime_alt = yprime -sqrt(2.0 * EarthRadius * fog_vertex_alt);
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}
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float fog_lightArg = (terminator-fog_yprime_alt)/100000.0;
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float fog_earthShade = 0.9 * smoothstep(terminator_width+ terminator, -terminator_width + terminator, fog_yprime_alt) + 0.1;
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float ct = dot(normalize(up), normalize(vertVec));
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/// END geometry for light
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/// BEGIN light
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vec4 light_diffuse;
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vec4 light_ambient;
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float intensity;
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light_diffuse.b = light_func(lightArg, 1.330e-05, 0.264, 3.827, 1.08e-05, 1.0);
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light_diffuse.g = light_func(lightArg, 3.931e-06, 0.264, 3.827, 7.93e-06, 1.0);
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light_diffuse.r = light_func(lightArg, 8.305e-06, 0.161, 3.827, 3.04e-05, 1.0);
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light_diffuse.a = 1.0;
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light_diffuse = light_diffuse * vertex_scattering;
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light_ambient.r = light_func(lightArg, 0.236, 0.253, 1.073, 0.572, 0.33);
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light_ambient.g = light_ambient.r * 0.4/0.33;
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light_ambient.b = light_ambient.r * 0.5/0.33;
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light_ambient.a = 1.0;
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if (earthShade < 0.5)
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{
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intensity = length(light_ambient.rgb);
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light_ambient.rgb = intensity * normalize(mix(light_ambient.rgb, shadedFogColor, 1.0 -smoothstep(0.1, 0.8,earthShade) ));
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light_ambient.rgb = light_ambient.rgb + moonLightColor * (1.0 - smoothstep(0.4, 0.5, earthShade));
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intensity = length(light_diffuse.rgb);
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light_diffuse.rgb = intensity * normalize(mix(light_diffuse.rgb, shadedFogColor, 1.0 -smoothstep(0.1, 0.7,earthShade) ));
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}
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// at high altitude, the light gets de-saturated and the ambient channel dies out
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// whereas the diffuse channel is enhanced
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float alt_desat_factor = smoothstep(10000.0, 100000.0, eye_alt);
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float ambient_reduction = 0.1 + 0.9 * (1.0-alt_desat_factor);
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float diffuse_enhancement = 1.0 + 1.0 * (1.0 - ambient_reduction);
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light_ambient.rgb = light_ambient.rgb * ambient_reduction;
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light_diffuse.rgb = light_diffuse.rgb * diffuse_enhancement;
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light_ambient.rgb = light_ambient.rgb + moonLightColor * (1.0 - smoothstep(0.4, 0.5, earthShade));
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//vec3 sky_blue = normalize (vec3 (0.17, 0.52, 0.87));
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//intensity = length(light_ambient.rgb);
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//light_ambient.rgb = mix(light_ambient.rgb, intensity * sky_blue, alt_desat_factor);
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intensity = length(light_diffuse.rgb);
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light_diffuse.rgb = mix(light_diffuse.rgb, intensity * vec3 (1.0,1.0,1.0), alt_desat_factor);
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float diffuse_reduction = 1;
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if (darkmap_enabled == 1)
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{
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diffuse_reduction = mix(1.0,lightmapTexel.a, darkmap_factor);
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light_diffuse.rgb = light_diffuse.rgb * diffuse_reduction;
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}
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light_diffuse.rgb = clamp(light_diffuse.rgb, 0.0, 1.2);
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/// END light
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/// BEGIN grain overlay
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if (grain_texture_enabled ==1)
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{
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grainTexel = texture2D(GrainTex, gl_TexCoord[0].st * grain_magnification);
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texel.rgb = mix(texel.rgb, grainTexel.rgb, grainTexel.a );
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}
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else if (grain_texture_enabled == 2)
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{
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grainTexel = texture2D(GrainTex, rawpos.xy * grain_magnification);
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texel.rgb = mix(texel.rgb, grainTexel.rgb, grainTexel.a );
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}
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/// END grain overlay
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///BEGIN bump
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if (nmap_enabled > 0){
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N = nmap.rgb * 2.0 - 1.0;
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N = normalize(N.x * VTangent + N.y * VBinormal + N.z * VNormal);
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if (nmap_dds > 0)
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N = -N;
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} else {
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N = normalize(VNormal);
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}
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///END bump
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vec4 reflection = textureCube(Environment, reflVec * dot(N,VNormal));
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vec3 viewVec = normalize(vViewVec);
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float v = abs(dot(viewVec, normalize(VNormal)));// Map a rainbowish color
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vec4 fresnel = texture2D(ReflGradientsTex, vec2(v, 0.75));
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vec4 rainbow = texture2D(ReflGradientsTex, vec2(v, 0.25));
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float nDotVP = max(0.0, dot(N, normalize(gl_LightSource[0].position.xyz)));
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float nDotHV = max(0.0, dot(N, normalize(gl_LightSource[0].halfVector.xyz)));
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//glare on the backside of tranparent objects
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if ((gl_FrontMaterial.diffuse.a < 1.0 || texel.a < 1.0)
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&& dot(N, normalize(gl_LightSource[0].position.xyz)) < 0.0) {
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nDotVP = max(0.0, dot(-N, normalize(gl_LightSource[0].position.xyz)));
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nDotHV = max(0.0, dot(-N, normalize(gl_LightSource[0].halfVector.xyz)));
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}
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float nDotVP1 = 0.0;
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float nDotHV1 = 0.0;
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// try specular reflection of sky irradiance
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nDotVP1 = max(0.0, dot(N, up));
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nDotHV1 = max(0.0, dot(N, normalize(normalize(up) + normalize(-vertVec))));
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if (nDotVP == 0.0)
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{pf = 0.0;}
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else
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{pf = pow(nDotHV, gl_FrontMaterial.shininess);}
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if (nDotVP1 == 0.0)
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{pf1 = 0.0;}
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else
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{pf1 = pow(nDotHV1, 0.5*gl_FrontMaterial.shininess);}
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vec3 relPos = (gl_ModelViewMatrixInverse * vec4 (vertVec,0.0)).xyz;
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if (cloud_shadow_flag == 1)
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{
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light_diffuse = light_diffuse * shadow_func(relPos.x, relPos.y, 1.0, dist);
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}
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vec3 secondary_light = vec3 (0.0,0.0,0.0);
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if (use_searchlight == 1)
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{
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secondary_light += searchlight();
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}
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if (use_landing_light == 1)
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{
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secondary_light += landing_light(landing_light1_offset, landing_light3_offset);
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}
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if (use_alt_landing_light == 1)
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{
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secondary_light += landing_light(landing_light2_offset, landing_light3_offset);
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}
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vec3 geo_light_vec = (gl_ModelViewMatrix * vec4 (geo_light_x, geo_light_y, geo_light_z, 0.0)).xyz;
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vec3 geo_light_rel_vec = geo_light_vec -(gl_ModelViewMatrix * vec4 (rawpos, 0.0)).xyz;
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float geo_light_incidence = geo_ambience + (1.0- geo_ambience) * clamp(dot(N, geo_light_rel_vec),0.0, 1.0);
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vec3 geo_light = vec3 (geo_light_r, geo_light_g, geo_light_b) * (1.0 - smoothstep(0.5 * geo_light_radius, geo_light_radius, length(geo_light_rel_vec))) * geo_light_incidence;
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vec4 Diffuse = light_diffuse * nDotVP;
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//Diffuse.rgb += secondary_light * light_distance_fading(dist) + geo_light;
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Diffuse.rgb = addLights(Diffuse.rgb, secondary_light * light_distance_fading(dist));
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//if (use_geo_light == 1)
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{Diffuse.rgb = addLights(Diffuse.rgb, geo_light * diffuse_reduction );}
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///BEGIN reflection correction by dirt
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float refl_d = 1.0;
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if ((dirt_enabled == 1) && (dirt_modulates_reflection == 1))
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{
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refl_d = 1.0 - (reflmap.r * dirt_r_factor * (1.0 - dirt_reflection_factor));
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}
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///END reflection correction by dirt
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vec4 Specular = gl_FrontMaterial.specular * light_diffuse * pf + gl_FrontMaterial.specular * light_ambient * pf1;
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Specular+= gl_FrontMaterial.specular * pow(max(0.0,-dot(N,normalize(vertVec))),gl_FrontMaterial.shininess) * vec4(secondary_light,1.0);
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Specular *= refl_d;
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vec4 color = gl_Color * light_ambient + gl_FrontMaterial.emission;
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color = color + Diffuse * gl_FrontMaterial.diffuse;
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color = clamp( color, 0.0, 1.0 );
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////////////////////////////////////////////////////////////////////
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//BEGIN reflect
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////////////////////////////////////////////////////////////////////
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if (refl_enabled > 0){
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float reflFactor = 0.0;
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float transparency_offset = clamp(refl_correction, -1.0, 1.0);// set the user shininess offset
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if(refl_map > 0){
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// map the shininess of the object with user input
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//float pam = (map.a * -2) + 1; //reverse map
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reflFactor = reflmap.a + transparency_offset;
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} else if (nmap_enabled > 0) {
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// set the reflectivity proportional to shininess with user input
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reflFactor = gl_FrontMaterial.shininess * 0.0078125 * nmap.a + transparency_offset;
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} else {
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reflFactor = gl_FrontMaterial.shininess* 0.0078125 + transparency_offset;
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}
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reflFactor = clamp(reflFactor, 0.0, 1.0);
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// add fringing fresnel and rainbow effects and modulate by reflection
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vec4 reflcolor = mix(reflection, rainbow, refl_rainbow * v);
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//vec4 reflcolor = reflection;
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vec4 reflfrescolor = mix(reflcolor, fresnel, refl_fresnel * v);
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vec4 noisecolor = mix(reflfrescolor, noisevec, refl_noise);
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vec4 raincolor = vec4(noisecolor.rgb * reflFactor, 1.0);
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raincolor += Specular;
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raincolor *= light_diffuse;
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if (refl_type == 1)
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{mixedcolor = mix(texel, raincolor, reflFactor * refl_d).rgb;}
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else if (refl_type == 2)
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{mixedcolor = ((texel +(reflcolor * reflFactor * refl_d))-(0.5*reflFactor * refl_d)).rgb;}
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} else {
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mixedcolor = texel.rgb;
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}
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/////////////////////////////////////////////////////////////////////
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//END reflect
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/////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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//begin DIRT
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//////////////////////////////////////////////////////////////////////
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if (dirt_enabled >= 1){
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vec3 dirtFactorIn = vec3 (dirt_r_factor, dirt_g_factor, dirt_b_factor);
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vec3 dirtFactor = reflmap.rgb * dirtFactorIn.rgb;
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//dirtFactor.r = smoothstep(0.0, 1.0, dirtFactor.r);
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mixedcolor.rgb = mix(mixedcolor.rgb, dirt_r_color, smoothstep(0.0, 1.0, dirtFactor.r));
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texel.rgb = mix(texel.rgb, dirt_r_color, smoothstep(0.0, 1.0, dirtFactor.r));
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if (dirt_multi > 0) {
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//dirtFactor.g = smoothstep(0.0, 1.0, dirtFactor.g);
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//dirtFactor.b = smoothstep(0.0, 1.0, dirtFactor.b);
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mixedcolor.rgb = mix(mixedcolor.rgb, dirt_g_color, smoothstep(0.0, 1.0, dirtFactor.g));
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mixedcolor.rgb = mix(mixedcolor.rgb, dirt_b_color, smoothstep(0.0, 1.0, dirtFactor.b));
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|
}
|
|
}
|
|
//////////////////////////////////////////////////////////////////////
|
|
//END Dirt
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
//begin WETNESS
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
if (rain_enabled >0.0)
|
|
{
|
|
texel.rgb = texel.rgb * (1.0 - 0.6 * wetness);
|
|
float rain_factor = 0.0;
|
|
if (rain_norm > 0.0)
|
|
{
|
|
rain_factor += DotNoise2D(rawpos.xy, 0.2 ,0.5, rain_norm) * abs(sin(6.0*osg_SimulationTime));
|
|
rain_factor += DotNoise2D(rawpos.xy, 0.3 ,0.4, rain_norm) * abs(sin(6.0*osg_SimulationTime + 2.094));
|
|
rain_factor += DotNoise2D(rawpos.xy, 0.4 ,0.3, rain_norm)* abs(sin(6.0*osg_SimulationTime + 4.188));
|
|
}
|
|
|
|
// secondary reflection of sky irradiance in water film
|
|
float fresnelW = ((0.8 * wetness) ) * (1.0-smoothstep(0.0,0.4, dot(N,-normalize(vertVec)) * 1.0 - 0.2 * rain_factor * wetness));
|
|
float sky_factor = (1.0-ct*ct);
|
|
vec3 sky_light = vec3 (1.0,1.0,1.0) * length(light_diffuse.rgb) * (1.0-effective_scattering);
|
|
Specular.rgb += sky_factor * fresnelW * sky_light;
|
|
}
|
|
/////////////////////////////////////////////////////////////////////
|
|
//end WETNESS
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
// set ambient adjustment to remove bluiness with user input
|
|
float ambient_offset = clamp(amb_correction, -1.0, 1.0);
|
|
vec4 ambient = gl_LightModel.ambient + light_ambient;
|
|
vec4 ambient_Correction = vec4(ambient.rg, ambient.b * 0.6, 1.0)
|
|
* ambient_offset ;
|
|
ambient_Correction = clamp(ambient_Correction, -1.0, 1.0);
|
|
|
|
ambient_Correction = vec4 (0.0, 0.0, 0.0, 1.0);
|
|
|
|
|
|
|
|
color.a = texel.a * alpha;
|
|
vec4 fragColor = vec4(color.rgb * mixedcolor + ambient_Correction.rgb, color.a);
|
|
|
|
fragColor += Specular * nmap.a;
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
// BEGIN lightmap
|
|
//////////////////////////////////////////////////////////////////////
|
|
if ( lightmap_enabled >= 1 ) {
|
|
vec3 lightmapcolor = vec3(0.0);
|
|
vec4 lightmapFactor = vec4(lightmap_r_factor, lightmap_g_factor,
|
|
lightmap_b_factor, lightmap_a_factor);
|
|
|
|
if (lightmap_multi > 0 ){
|
|
lightmapFactor = lightmapFactor * lightmapTexel;
|
|
//lightmapcolor = lightmap_r_color * lightmapFactor.r +
|
|
//lightmap_g_color * lightmapFactor.g +
|
|
//lightmap_b_color * lightmapFactor.b +
|
|
//lightmap_a_color * lightmapFactor.a ;
|
|
lightmapcolor = lightmap_r_color * lightmapFactor.r;
|
|
lightmapcolor = addLights(lightmapcolor, lightmap_g_color * lightmapFactor.g);
|
|
lightmapcolor = addLights(lightmapcolor, lightmap_b_color * lightmapFactor.b);
|
|
if (darkmap_enabled == 0)
|
|
{
|
|
lightmapcolor = addLights(lightmapcolor, lightmap_a_color * lightmapFactor.a);
|
|
}
|
|
|
|
} else {
|
|
lightmapcolor = lightmapTexel.rgb * lightmap_r_color * lightmapFactor.r;
|
|
}
|
|
fragColor.rgb = max(fragColor.rgb, lightmapcolor * gl_FrontMaterial.diffuse.rgb * smoothstep(0.0, 1.0, mixedcolor*.5 + lightmapcolor*.5));
|
|
}
|
|
//////////////////////////////////////////////////////////////////////
|
|
// END lightmap
|
|
/////////////////////////////////////////////////////////////////////
|
|
|
|
/// BEGIN glow
|
|
|
|
float temperature = delta_T;
|
|
|
|
if (darkmap_enabled == 2)
|
|
{
|
|
temperature *= (1.0 - darkmap_factor * lightmapTexel.a);
|
|
}
|
|
|
|
vec4 glow = color_temperature(temperature);
|
|
float glowFactor = 0.3 + 0.6 * (1.0 - length(texel.rgb)/1.73);
|
|
glowFactor *= glow.a;
|
|
fragColor.rgb = mix(fragColor.rgb, glow.rgb, glowFactor);
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
// END glow
|
|
/////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
/// BEGIN fog amount
|
|
|
|
float transmission;
|
|
float vAltitude;
|
|
float delta_zv;
|
|
float H;
|
|
float distance_in_layer;
|
|
float transmission_arg;
|
|
float eqColorFactor;
|
|
|
|
float delta_z = hazeLayerAltitude - eye_alt;
|
|
float mvisibility = min(visibility, avisibility);
|
|
|
|
if (dist > 0.04 * mvisibility)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
|
|
transmission_arg = (dist-distance_in_layer)/avisibility;
|
|
|
|
|
|
if (visibility < avisibility)
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/visibility);
|
|
eqColorFactor = 1.0 - 0.1 * delta_zv/visibility - (1.0 -effective_scattering);
|
|
}
|
|
else
|
|
{
|
|
transmission_arg = transmission_arg + (distance_in_layer/avisibility);
|
|
eqColorFactor = 1.0 - 0.1 * delta_zv/avisibility - (1.0 -effective_scattering);
|
|
}
|
|
transmission = fog_func(transmission_arg, alt);
|
|
if (eqColorFactor < 0.2) eqColorFactor = 0.2;
|
|
}
|
|
else
|
|
{
|
|
eqColorFactor = 1.0;
|
|
transmission = 1.0;
|
|
}
|
|
|
|
/// END fog amount
|
|
|
|
/// BEGIN fog color
|
|
|
|
vec3 hazeColor = get_hazeColor(fog_lightArg);
|
|
|
|
float rShade = 1.0 - 0.9 * smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt + 420000.0);
|
|
float lightIntensity = length(hazeColor * effective_scattering) * rShade;
|
|
|
|
if (transmission< 1.0)
|
|
{
|
|
|
|
|
|
|
|
if (fog_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);
|
|
hazeColor = intensity * normalize (mix(hazeColor, intensity * vec3 (1.0,1.0,1.0), 0.7* smoothstep(5000.0, 50000.0, alt)));
|
|
|
|
hazeColor.r = hazeColor.r * 0.83;
|
|
hazeColor.g = hazeColor.g * 0.9;
|
|
|
|
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,fog_earthShade) ));
|
|
hazeColor = intensity * normalize(mix(hazeColor, shadedFogColor, (1.0-smoothstep(0.5,0.9,eqColorFactor))));
|
|
|
|
float shadow = mix( min(1.0 + dot(VNormal,gl_LightSource[0].position.xyz),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));
|
|
}
|
|
else
|
|
{
|
|
hazeColor = vec3 (1.0, 1.0, 1.0);
|
|
}
|
|
|
|
|
|
/// END fog color
|
|
fragColor = clamp(fragColor, 0.0, 1.0);
|
|
//hazeColor = clamp(hazeColor, 0.0, 1.0);
|
|
|
|
///BEGIN Rayleigh fog ///
|
|
|
|
// Rayleigh color shift due to out-scattering
|
|
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);
|
|
|
|
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);
|
|
|
|
/// END Rayleigh fog
|
|
|
|
// 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 *= eqColorFactor * fog_earthShade;
|
|
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;
|
|
|
|
|
|
}
|