// -*-C++-*- #version 120 // adapted by James Hester 2018, based on rock-ALS.frag // by Thorsten Renk. // Ambient term comes in gl_Color.rgb. varying vec4 diffuse_term; varying vec3 normal; varying vec3 relPos; varying vec2 rawPos; varying vec3 worldPos; varying vec3 ecViewdir; varying float steepness; varying vec2 grad_dir; varying float flogz; uniform float fg_Fcoef; 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 dust_cover_factor; uniform float lichen_cover_factor; uniform float wetness; uniform float fogstructure; uniform float cloud_self_shading; uniform float contrast; uniform float air_pollution; uniform float intrinsic_wetness; uniform float transition_model; uniform float overlay_bias; uniform float crack_depth; uniform float crack_pattern_stretch; uniform float grain_fade_power; uniform float rock_brightness; uniform float overlay_alpha; uniform float dust_resistance; uniform float slopeline_strength; uniform float landing_light1_offset; uniform float landing_light2_offset; uniform float landing_light3_offset; uniform float osg_SimulationTime; uniform vec3 base_color; uniform vec3 overlay_color; uniform int wind_effects; uniform int cloud_shadow_flag; uniform int rock_strata; 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 Noise3D(in vec3 coord, in float wavelength); float VoronoiNoise2D(in vec2 coord, in float wavelength, in float xrand, in float yrand); float SlopeLines2D(in vec2 coord, in vec2 gradDir, in float wavelength, in float steepness); float Strata3D(in vec3 coord, in float wavelength, in float variation); float fog_func (in float targ, in float alt); float rayleigh_in_func(in float dist, in float air_pollution, in float avisibility, in float eye_alt, in float vertex_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); vec3 rayleigh_out_shift(in vec3 color, in float outscatter); vec3 get_hazeColor(in float light_arg); vec3 searchlight(); vec3 landing_light(in float offset, in float offsetv); vec3 filter_combined (in vec3 color) ; float light_func (in float x, in float a, in float b, in float c, in float d, in float e) { x = x - 0.5; // use the asymptotics to shorten computations if (x > 30.0) {return e;} if (x < -15.0) {return 0.0;} return e / pow((1.0 + a * exp(-b * (x-c)) ),(1.0/d)); } // a fade function for procedural scales which are smaller than a pixel float detail_fade (in float scale, in float angle, in float dist) { float fade_dist = 2000.0 * scale * angle/max(pow(steepness,4.0), 0.1); return 1.0 - smoothstep(0.5 * fade_dist, fade_dist, dist); } 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); // horizontal distance using texture coordinate float horiz_coord = gl_TexCoord[0].s * 1000.0; // angle of view vector with horizon float ct = dot(vec3(0.0, 0.0, 1.0), relPos)/dist; // float altitude of fragment above base of cliff float cliff_altitude = gl_TexCoord[0].t * 1000.0; 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 = normalize(normalize(lightDir) + normalize(ecViewdir)); vec4 texel; vec4 detail_texel; vec4 mix_texel; vec4 grain_texel; vec4 dot_texel; vec4 gradient_texel; vec4 foam_texel; vec4 fragColor; vec4 specular = vec4(0.0); float intensity; // Perlin noise, distance along cliff in texture coordinate instead of x,y float noise_100m = Noise2D(vec2(horiz_coord,cliff_altitude),100.0); float noise_50m = Noise2D(vec2(horiz_coord,cliff_altitude), 50.0); float noise_25m = Noise2D(vec2(horiz_coord,cliff_altitude), 25.0); float noise_10m = Noise2D(vec2(horiz_coord,cliff_altitude), 10.0); float noise_5m = Noise2D(vec2(horiz_coord,cliff_altitude) ,5.0); float noise_2m = Noise2D(vec2(horiz_coord,cliff_altitude) ,2.0); float noise_1m = Noise2D(vec2(horiz_coord,cliff_altitude) ,1.0); float noise_05m = Noise2D(vec2(horiz_coord,cliff_altitude),0.5); float noise_02m = Noise2D(vec2(horiz_coord,cliff_altitude),0.2); float noise_01m = Noise2D(vec2(horiz_coord,cliff_altitude), 0.1); float noisegrad_10m; float noisegrad_5m; float noisegrad_2m; float noisegrad_1m; float noisegrad_05m; float noisegrad_02m; float noisegrad_01m; float noise_250m = Noise3D(worldPos.xyz,250.0); float noise_500m = Noise3D(worldPos.xyz, 500.0); float noise_1500m = Noise3D(worldPos.xyz, 1500.0); float noise_2000m = Noise3D(worldPos.xyz, 2000.0); // dot noise float dotnoise_2m = 0.0; float dotnoise_10m = 0.0; float dotnoise_15m = 0.0; float dotnoisegrad_10m; // slope noise float slopenoise_50m = SlopeLines2D(rawPos, grad_dir, 50.0, steepness); float slopenoise_100m = SlopeLines2D(rawPos, grad_dir, 100.0, steepness); // get the texels float noise_term; float local_autumn_factor; // we need to fade procedural structures when they get smaller than a single pixel, for this we need // to know under what angle we see the surface float view_angle = abs(dot(normalize(normal), normalize(ecViewdir))); // strata noise float stratnoise_50m; float stratnoise_10m; if (rock_strata==1) { stratnoise_50m = Strata3D(vec3 (rawPos.x, rawPos.y, cliff_altitude), 50.0, 0.2); stratnoise_10m = Strata3D(vec3 (rawPos.x, rawPos.y, cliff_altitude), 10.0, 0.2); stratnoise_50m = mix(stratnoise_50m, 1.0, smoothstep(0.8,0.9, steepness)); stratnoise_10m = mix(stratnoise_10m, 1.0, smoothstep(0.8,0.9, steepness)); texel *= (0.4 + 0.4 * stratnoise_50m + 0.2 * stratnoise_10m); } // procedural rock texture generation texel.rgb = base_color; // use powers of Perlin noise to generate the base pattern float grainy_noise; float fade_norm; float gfp = grain_fade_power; float gfptmp; //grainy_noise = (0.5 * (1.0-slopenoise_100m) + 0.5 *noise_50m) + gfp * (0.5 * slopenoise_50m + 0.5 * noise_25m); grainy_noise = (0.5 *noise_50m) + gfp * ( 0.5 * noise_25m); fade_norm = 1.0+gfp; gfptmp = gfp * gfp; grainy_noise += noise_10m * gfptmp * detail_fade(10.0, view_angle, dist) ; fade_norm += gfptmp * detail_fade(10.0, view_angle, dist) ; gfptmp = gfptmp * gfp; grainy_noise += noise_5m * gfptmp * detail_fade(5.0, view_angle, dist) ; fade_norm += gfptmp * detail_fade(5.0, view_angle, dist) ; gfptmp = gfptmp * gfp; grainy_noise += noise_2m * gfptmp * detail_fade(2.0, view_angle, dist) ; fade_norm += gfptmp * detail_fade(2.0, view_angle, dist) ; gfptmp = gfptmp * gfp; grainy_noise += noise_1m * gfptmp * detail_fade(1.0, view_angle, dist) ; fade_norm += gfptmp * detail_fade(1.0, view_angle, dist) ; gfptmp = gfptmp * gfp; grainy_noise += noise_05m * gfptmp * detail_fade(0.5, view_angle, dist) ; fade_norm += gfptmp * detail_fade(0.5, view_angle, dist) ; grainy_noise = grainy_noise/fade_norm; grainy_noise = smoothstep(-0.2, 1.2, grainy_noise); // generate the crack pattern from isovalue lines of stretched Perlin noise float cnoise_500m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 500.0); float cnoise_250m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 250.0); float cnoise_100m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 100.0); float cnoise_50m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 50.0); float cnoise_25m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 25.0); float cnoise_10m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 10.0); float cnoise_5m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 5.0); float cnoise_2m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 2.0); float cnoise_1m = Noise2D(vec2(horiz_coord+10.0, crack_pattern_stretch * cliff_altitude), 1.0); float crack_noise; float crack_factor; float crack_size; float scrack_noise; float scrack_size; crack_noise = cnoise_500m + 0.65 * cnoise_250m + 0.42 * cnoise_100m * detail_fade(50.0, view_angle, dist) ; crack_noise = crack_noise + 0.27 * cnoise_50m * detail_fade(25.0, view_angle, dist) ; crack_noise = crack_noise + 0.17 * cnoise_25m * detail_fade(10.0, view_angle, dist) ; crack_noise = crack_noise + 0.11 * cnoise_10m * detail_fade(5.0, view_angle, dist) ; crack_noise = 0.381 * crack_noise; scrack_noise = cnoise_10m + 0.65 * cnoise_5m * detail_fade(5.0, view_angle, dist); scrack_noise = scrack_noise + 0.3 * cnoise_2m + 0.1 * cnoise_1m * detail_fade(1.0, view_angle, dist); scrack_noise = 0.48 * scrack_noise; crack_size = 0.02 +0.00001 * dist; crack_factor = smoothstep(0.5-crack_size,0.50,crack_noise) * (1.0-smoothstep(0.51,0.51+crack_size,crack_noise)); //crack_factor = step(0.5-0.2*crack_size,crack_noise) * (1.0-step(0.5+0.2*crack_size,crack_noise)); crack_size *= 0.5; crack_factor += smoothstep(0.42,0.42+crack_size,crack_noise) * (1.0-smoothstep(0.43,0.43+crack_size,crack_noise)); scrack_size = crack_size * 4.0; crack_factor += 0.75 * smoothstep(0.5-scrack_size,0.50,scrack_noise) * (1.0-smoothstep(0.51,0.51+scrack_size,scrack_noise))* (1.0- smoothstep(250.0,1000.0,dist)); crack_factor = crack_factor * min(1.0,0.03/crack_size); // distribution of overlay color float overlay_noise; float overlay_factor; overlay_noise = 0.381 * (noise_50m + 0.65 * noise_25m + 0.42 * noise_10m + 0.27 * noise_5m + 0.17 * noise_2m + 0.11 * noise_1m); overlay_noise = overlay_noise + 0.1 * (smoothstep(0.8,0.9, steepness)); overlay_factor = smoothstep(0.7, 0.72, overlay_noise + overlay_bias) + (1.0 - smoothstep(0.2, 0.22, overlay_noise - overlay_bias)); // merge the noise components //grainy_noise = grainy_noise * (1.0-crack_depth * crack_factor) + 0.5 * crack_depth * crack_factor; texel.rgb = ((1.0 - contrast) + contrast * grainy_noise ) * texel.rgb; texel.rgb = mix(texel.rgb, overlay_color.rgb,overlay_alpha * overlay_factor); texel.rgb = texel.rgb * ((1.0-crack_depth) +crack_depth*(1.0-crack_factor * (0.5 + 0.5 * noise_50m) )); texel.rgb = texel.rgb * rock_brightness; texel.rgb = texel.rgb * (1.0 + 0.4 * (noise_01m-0.5) * detail_fade(0.1, view_angle, dist)) ; const vec4 dust_color = vec4 (0.76, 0.65, 0.45, 1.0); const vec4 lichen_color = vec4 (0.17, 0.20, 0.06, 1.0); // mix vegetation float gradient_factor = smoothstep(0.5, 1.0, steepness); texel = mix(texel, lichen_color, gradient_factor * (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 *dust_resistance + 3.0 * dust_cover_factor * dust_resistance *(((noise_1500m - 0.5) * 0.125)+0.125 ), 0.0, 1.0) ); // get distribution of water when terrain is wet float combined_wetness = min(1.0, wetness + intrinsic_wetness); float water_threshold1; float water_threshold2; float water_factor =0.0; if ((dist < 5000.0) && (combined_wetness>0.0)) { water_threshold1 = 1.0-0.5* combined_wetness; water_threshold2 = 1.0 - 0.3 * combined_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)); } // darken wet terrain texel.rgb = texel.rgb * (1.0 - 0.6 * combined_wetness); // 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; n = normalize(n); NdotL = dot(n, lightDir); noisegrad_10m = (noise_10m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),10.0))/0.05; noisegrad_5m = (noise_5m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),5.0))/0.05; noisegrad_2m = (noise_2m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),2.0))/0.05; noisegrad_1m = (noise_1m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),1.0))/0.05; noisegrad_05m = (noise_05m - Noise2D(rawPos.xy+ 0.05 * normalize(lightDir.xy),0.5))/0.05; dotnoisegrad_10m = 0.0; float fresnel; if (NdotL > 0.0) { if (cloud_shadow_flag == 1) {NdotL = NdotL * shadow_func(relPos.x, relPos.y, 0.3 * noise_250m + 0.5 * noise_500m+0.2 * noise_1500m, dist);} color += diffuse_term * NdotL; NdotHV = max(dot(n, halfVector), 0.0); fresnel = 1.0 + 5.0 * (1.0-smoothstep(0.0,0.2, dot(normalize(ecViewdir),n))); //if (gl_FrontMaterial.shininess > 0.0) specular.rgb = ((gl_FrontMaterial.specular.rgb * 0.1 + (water_factor * vec3 (1.0, 1.0, 1.0))) * light_specular.rgb * pow(NdotHV, max(gl_FrontMaterial.shininess,4.0) + (20.0 * water_factor))); } 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 += 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; float lightArg = (terminator-yprime_alt)/100000.0; vec3 hazeColor = get_hazeColor(lightArg); // 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); // 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; } } // blur of the haze layer edge float blur_thickness = 50.0; float cphi = dot(vec3(0.0, 1.0, 0.0), relPos)/dist; float ctlayer = delta_z/dist-0.01 + 0.02 * Noise2D(vec2(cphi,1.0),0.1) -0.01; float ctblur = 0.035 ; float blur_dist; if (abs(delta_z) < 400.0) { blur_dist = dist * (1.0-smoothstep(0.0,300.0,-delta_z)) * smoothstep(-400.0,-200.0, -delta_z); blur_dist = blur_dist * smoothstep(ctlayer-4.0*ctblur, ctlayer-ctblur, ct) * (1.0-smoothstep(ctlayer+0.5*ctblur, ctlayer+ctblur, ct)); distance_in_layer = max(distance_in_layer, blur_dist); } // 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) { transmission_arg = transmission_arg + (distance_in_layer/(1.0 * visibility + 1.0 * visibility * fogstructure * 0.06 * (noise_1500m + noise_2000m -1.0) )); // this combines the Weber-Fechner intensity eqColorFactor = 1.0 - 0.1 * delta_zv/visibility - (1.0 - effective_scattering); } else { transmission_arg = transmission_arg + (distance_in_layer/(1.0 * avisibility + 1.0 * avisibility * fogstructure * 0.06 * (noise_1500m + noise_2000m - 1.0) )); // 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; gl_FragDepth = log2(flogz) * fg_Fcoef * 0.5; }