// -*- mode: C; -*- // Licence: GPL v2 // Authors: Frederic Bouvier and Gijs de Rooy // with major additions and revisions by // Emilian Huminiuc and Vivian Meazza 2011 // ported to Atmospheric Light Scattering // by Thorsten Renk, 2013 #version 120 varying vec3 VBinormal; varying vec3 VNormal; varying vec3 VTangent; varying vec3 rawpos; varying vec3 reflVec; varying vec3 vViewVec; varying vec3 vertVec; varying float alpha; uniform sampler2D BaseTex; uniform sampler2D LightMapTex; uniform sampler2D NormalTex; uniform sampler2D ReflFresnelTex; uniform sampler2D ReflMapTex; uniform sampler2D ReflRainbowTex; uniform sampler3D ReflNoiseTex; uniform samplerCube Environment; uniform int dirt_enabled; uniform int dirt_multi; uniform int lightmap_enabled; uniform int lightmap_multi; uniform int nmap_dds; uniform int nmap_enabled; uniform int refl_enabled; uniform int refl_map; uniform int shader_qual; uniform float amb_correction; uniform float dirt_b_factor; uniform float dirt_g_factor; uniform float dirt_r_factor; uniform float lightmap_a_factor; uniform float lightmap_b_factor; uniform float lightmap_g_factor; uniform float lightmap_r_factor; uniform float nmap_tile; uniform float refl_correction; uniform float refl_fresnel; uniform float refl_noise; uniform float refl_rainbow; uniform float avisibility; uniform float cloud_self_shading; uniform float eye_alt; uniform float ground_scattering; uniform float hazeLayerAltitude; uniform float moonlight; uniform float overcast; uniform float scattering; uniform float terminator; uniform float terrain_alt; uniform float visibility; // constants needed by the light and fog computations ################################################### const float EarthRadius = 5800000.0; const float terminator_width = 200000.0; uniform vec3 lightmap_r_color; uniform vec3 lightmap_g_color; uniform vec3 lightmap_b_color; uniform vec3 lightmap_a_color; uniform vec3 dirt_r_color; uniform vec3 dirt_g_color; uniform vec3 dirt_b_color; // uniform mat4 osg_ViewMatrixInverse; // uniform mat4 osg_ViewMatrix; float light_func (in float x, in float a, in float b, in float c, in float d, in float e) { 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)); } float fog_func (in float targ, in float altitude) { float fade_mix; targ = 1.25 * targ * smoothstep(0.04,0.06,targ); // need to sync with the distance to which objects are drawn unfogged if (altitude < 30000.0) {return exp(-targ - targ * targ * targ * targ);} else if (altitude < 50000.0) { fade_mix = (altitude - 30000.0)/20000.0; return fade_mix * exp(-targ*targ - pow(targ,4.0)) + (1.0 - fade_mix) * exp(-targ - pow(targ,4.0)); } else { return exp(- targ * targ - pow(targ,4.0)); } } void main (void) { vec4 texel = texture2D(BaseTex, gl_TexCoord[0].st); vec4 nmap = texture2D(NormalTex, gl_TexCoord[0].st * nmap_tile); vec4 reflmap = texture2D(ReflMapTex, gl_TexCoord[0].st); vec4 noisevec = texture3D(ReflNoiseTex, rawpos.xyz); vec4 lightmapTexel = texture2D(LightMapTex, gl_TexCoord[0].st); vec3 mixedcolor; vec3 N = vec3(0.0,0.0,1.0); float pf = 0.0; ///some generic light scattering parameters vec3 shadedFogColor = vec3(0.65, 0.67, 0.78); vec3 moonLightColor = vec3 (0.095, 0.095, 0.15) * moonlight; float alt = eye_alt; float effective_scattering = min(scattering, cloud_self_shading); /// BEGIN geometry for light vec3 up = (gl_ModelViewMatrix * vec4(0.0,0.0,1.0,0.0)).xyz; //vec4 worldPos3D = (osg_ViewMatrixInverse * vec4 (0.0,0.0,0.0, 1.0)); //worldPos3D.a = 0.0; //vec3 up = (osg_ViewMatrix * worldPos3D).xyz; float dist = length(vertVec); float vertex_alt = max(100.0,dot(up, vertVec) + alt); float vertex_scattering = ground_scattering + (1.0 - ground_scattering) * smoothstep(hazeLayerAltitude -100.0, hazeLayerAltitude + 100.0, vertex_alt); vec3 lightHorizon = gl_LightSource[0].position.xyz - up * dot(up,gl_LightSource[0].position.xyz); float yprime = -dot(vertVec, lightHorizon); float yprime_alt = yprime - sqrt(2.0 * EarthRadius * vertex_alt); float lightArg = (terminator-yprime_alt)/100000.0; float earthShade = 0.6 * (1.0 - smoothstep(-terminator_width+ terminator, terminator_width + terminator, yprime_alt)) + 0.4; float mie_angle; if (lightArg < 10.0) {mie_angle = (0.5 * dot(normalize(vertVec), normalize(gl_LightSource[0].position.xyz)) ) + 0.5;} else {mie_angle = 1.0;} float fog_vertex_alt = max(vertex_alt,hazeLayerAltitude); float fog_yprime_alt = yprime_alt; if (fog_vertex_alt > hazeLayerAltitude) { if (dist > 0.8 * avisibility) { fog_vertex_alt = mix(fog_vertex_alt, hazeLayerAltitude, smoothstep(0.8*avisibility, avisibility, dist)); fog_yprime_alt = yprime -sqrt(2.0 * EarthRadius * fog_vertex_alt); } } else { fog_vertex_alt = hazeLayerAltitude; fog_yprime_alt = yprime -sqrt(2.0 * EarthRadius * fog_vertex_alt); } float fog_lightArg = (terminator-fog_yprime_alt)/100000.0; float fog_earthShade = 0.9 * smoothstep(terminator_width+ terminator, -terminator_width + terminator, fog_yprime_alt) + 0.1; float ct = dot(normalize(up), normalize(vertVec)); /// END geometry for light /// BEGIN light vec4 light_diffuse; vec4 light_ambient; float intensity; light_diffuse.b = light_func(lightArg, 1.330e-05, 0.264, 3.827, 1.08e-05, 1.0); light_diffuse.g = light_func(lightArg, 3.931e-06, 0.264, 3.827, 7.93e-06, 1.0); light_diffuse.r = light_func(lightArg, 8.305e-06, 0.161, 3.827, 3.04e-05, 1.0); light_diffuse.a = 1.0; light_diffuse = light_diffuse * vertex_scattering; light_ambient.r = light_func(lightArg, 0.236, 0.253, 1.073, 0.572, 0.33); light_ambient.g = light_ambient.r * 0.4/0.33; light_ambient.b = light_ambient.r * 0.5/0.33; light_ambient.a = 1.0; if (earthShade < 0.5) { intensity = length(light_ambient.rgb); light_ambient.rgb = intensity * normalize(mix(light_ambient.rgb, shadedFogColor, 1.0 -smoothstep(0.1, 0.8,earthShade) )); light_ambient.rgb = light_ambient.rgb + moonLightColor * (1.0 - smoothstep(0.4, 0.5, earthShade)); intensity = length(light_diffuse.rgb); light_diffuse.rgb = intensity * normalize(mix(light_diffuse.rgb, shadedFogColor, 1.0 -smoothstep(0.1, 0.7,earthShade) )); } /// END light ///BEGIN bump if (nmap_enabled > 0 && shader_qual > 2){ N = nmap.rgb * 2.0 - 1.0; N = normalize(N.x * VTangent + N.y * VBinormal + N.z * VNormal); if (nmap_dds > 0) N = -N; } else { N = normalize(VNormal); } ///END bump vec4 reflection = textureCube(Environment, reflVec * dot(N,VNormal)); vec3 viewVec = normalize(vViewVec); float v = abs(dot(viewVec, normalize(VNormal)));// Map a rainbowish color vec4 fresnel = texture2D(ReflFresnelTex, vec2(v, 0.0)); vec4 rainbow = texture2D(ReflRainbowTex, vec2(v, 0.0)); float nDotVP = max(0.0, dot(N, normalize(gl_LightSource[0].position.xyz))); float nDotHV = max(0.0, dot(N, normalize(gl_LightSource[0].halfVector.xyz))); //glare on the backside of tranparent objects if ((gl_FrontMaterial.diffuse.a < 1.0 || texel.a < 1.0) && dot(N, normalize(gl_LightSource[0].position.xyz)) < 0.0) { nDotVP = max(0.0, dot(-N, normalize(gl_LightSource[0].position.xyz))); nDotHV = max(0.0, dot(-N, normalize(gl_LightSource[0].halfVector.xyz))); } if (nDotVP == 0.0) pf = 0.0; else pf = pow(nDotHV, gl_FrontMaterial.shininess); //vec4 Diffuse = gl_LightSource[0].diffuse * nDotVP; vec4 Diffuse = light_diffuse * nDotVP; //vec4 Specular = gl_FrontMaterial.specular * gl_LightSource[0].specular * pf; vec4 Specular = gl_FrontMaterial.specular * light_diffuse * pf; vec4 color = gl_Color + Diffuse * gl_FrontMaterial.diffuse; color += Specular * gl_FrontMaterial.specular * nmap.a; color = clamp( color, 0.0, 1.0 ); //////////////////////////////////////////////////////////////////// //BEGIN reflect //////////////////////////////////////////////////////////////////// if (refl_enabled > 0 && shader_qual > 1){ float reflFactor = 0.0; float transparency_offset = clamp(refl_correction, -1.0, 1.0);// set the user shininess offset if(refl_map > 0){ // map the shininess of the object with user input //float pam = (map.a * -2) + 1; //reverse map reflFactor = reflmap.a + transparency_offset; } else if (nmap_enabled > 0 && shader_qual > 2) { // set the reflectivity proportional to shininess with user input reflFactor = gl_FrontMaterial.shininess * 0.0078125 * nmap.a + transparency_offset; } else { reflFactor = gl_FrontMaterial.shininess* 0.0078125 + transparency_offset; } reflFactor = clamp(reflFactor, 0.0, 1.0); // add fringing fresnel and rainbow effects and modulate by reflection vec4 reflcolor = mix(reflection, rainbow, refl_rainbow * v); reflcolor += Specular * nmap.a; vec4 reflfrescolor = mix(reflcolor, fresnel, refl_fresnel * v); vec4 noisecolor = mix(reflfrescolor, noisevec, refl_noise); vec4 raincolor = vec4(noisecolor.rgb * reflFactor, 1.0); raincolor += Specular * nmap.a; raincolor *= light_diffuse; mixedcolor = mix(texel, raincolor, reflFactor).rgb; } else { mixedcolor = texel.rgb; } ///////////////////////////////////////////////////////////////////// //END reflect ///////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////// //begin DIRT ////////////////////////////////////////////////////////////////////// if (dirt_enabled > 0.0){ vec3 dirtFactorIn = vec3 (dirt_r_factor, dirt_g_factor, dirt_b_factor); vec3 dirtFactor = reflmap.rgb * dirtFactorIn.rgb; //dirtFactor.r = smoothstep(0.0, 1.0, dirtFactor.r); mixedcolor.rgb = mix(mixedcolor.rgb, dirt_r_color, smoothstep(0.0, 1.0, dirtFactor.r)); if (dirt_multi > 0) { //dirtFactor.g = smoothstep(0.0, 1.0, dirtFactor.g); //dirtFactor.b = smoothstep(0.0, 1.0, dirtFactor.b); mixedcolor.rgb = mix(mixedcolor.rgb, dirt_g_color, smoothstep(0.0, 1.0, dirtFactor.g)); mixedcolor.rgb = mix(mixedcolor.rgb, dirt_b_color, smoothstep(0.0, 1.0, dirtFactor.b)); } } ////////////////////////////////////////////////////////////////////// //END Dirt ////////////////////////////////////////////////////////////////////// // set ambient adjustment to remove bluiness with user input float ambient_offset = clamp(amb_correction, -1.0, 1.0); //vec4 ambient = gl_LightModel.ambient + gl_LightSource[0].ambient; 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); 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); lightmapFactor = lightmapFactor * lightmapTexel; if (lightmap_multi >0 ){ lightmapcolor = lightmap_r_color * lightmapFactor.r + lightmap_g_color * lightmapFactor.g + lightmap_b_color * lightmapFactor.b + lightmap_a_color * lightmapFactor.a ; } else { lightmapcolor = lightmapTexel.rgb * lightmap_r_color * lightmapFactor.r; } fragColor.rgb = max(fragColor.rgb, lightmapcolor * gl_FrontMaterial.diffuse.rgb * mixedcolor); } ////////////////////////////////////////////////////////////////////// // END lightmap ///////////////////////////////////////////////////////////////////// /// 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; if (dist > max(40.0, 0.04 * min(visibility,avisibility))) { 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,min(visibility, avisibility)) * 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; if (transmission< 1.0) { hazeColor.b = light_func(fog_lightArg-0.5, 1.330e-05, 0.264, 2.527, 1.08e-05, 1.0); hazeColor.g = light_func(fog_lightArg-0.5, 3.931e-06, 0.264, 3.827, 7.93e-06, 1.0); hazeColor.r = light_func(fog_lightArg-0.5, 8.305e-06, 0.161, 3.827, 3.04e-05, 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); //fragColor = fragColor * smoothstep(-0.05, 0.05, ct); fragColor.rgb = mix(eqColorFactor * hazeColor * fog_earthShade, fragColor.rgb,transmission); gl_FragColor = fragColor; }