94 lines
3.7 KiB
Plaintext
94 lines
3.7 KiB
Plaintext
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/*
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--------------------------------------------------------------------------------
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This source file is part of SkyX.
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Visit http://www.paradise-studios.net/products/skyx/
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Copyright (C) 2009-2012 Xavier Vergu<67>n Gonz<6E>lez <xavyiy@gmail.com>
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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http://www.gnu.org/copyleft/lesser.txt.
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--------------------------------------------------------------------------------
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*/
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// ------------------------- SkyX clouds -----------------------------
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// ------------------------ GLSL fragment ----------------------------
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// IN
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varying vec3 vPosition;
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// OUT
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// UNIFORM
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uniform float uExposure;
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// Sun information
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uniform vec3 uSunColor;
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// Main cloud layer parameters
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uniform float uHeight;
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uniform float uTime;
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uniform float uScale;
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uniform vec2 uWindDirection;
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// Advanced cloud layer parameters
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uniform float uCloudLayerHeightVolume; // 0.25
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uniform float uCloudLayerVolumetricDisplacement; // 0.01
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uniform vec3 uAmbientLuminosity; // 0.55 0.55 0.55
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uniform float uDetailAttenuation; // 0.45
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uniform float uDistanceAttenuation; // 0.05
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uniform sampler2D uClouds;
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uniform sampler2D uCloudsNormal;
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uniform sampler2D uCloudsTile;
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void main(void)
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{
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// Get the cloud pixel lenght on the projected plane
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float vh = uHeight / vPosition.y;
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// Get the 3D position of the cloud pixel
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vec3 CloudPosition = vPosition * vh;
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// Get texture coords
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vec2 TexCoord = CloudPosition.xz*uScale;
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float Density = texture2D(uClouds, TexCoord+uTime*uWindDirection*0.25).r;
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vec3 Normal = -(2.0*texture2D(uCloudsNormal, TexCoord+uTime*uWindDirection*0.25).xyz-1.0);
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Normal.zy = Normal.yz;
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///------------ Volumetric effect:
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float CloudLayerHeightVolume = uCloudLayerHeightVolume*vPosition.y;
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float CloudLayerVolumetricDisplacement = uCloudLayerVolumetricDisplacement*vPosition.y;
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vec3 iNewPosition = normalize(vPosition + CloudLayerVolumetricDisplacement*vec3(Normal.x,0,Normal.z));
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vh = (uHeight+uHeight*(1.0-Density)*CloudLayerHeightVolume) / iNewPosition.y;
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CloudPosition = iNewPosition * vh;
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TexCoord = CloudPosition.xz*uScale; // Little offset
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Density = texture2D(uClouds, TexCoord+uTime*uWindDirection*0.25 + vec2(0.2,0.6)).r;
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///------------
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float CloudTile = texture2D(uCloudsTile, TexCoord-uTime*uWindDirection*0.25).r;
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// Ambient + Sun*Density
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vec3 PixelColor = uAmbientLuminosity + uSunColor*Density;
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// AMBIENT addition
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//PixelColor += uAmbientLuminosity;
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// SUN addition
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// PixelColor += uSunColor*clamp(dot(-normalize(Normal), normalize(uSunPosition)), 0.0, 1.0);
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// FINAL colour
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float Alpha = Density * clamp(10.0*clamp(-uDistanceAttenuation+vPosition.y, 0.0, 1.0), 0.0, 1.0);
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gl_FragColor = vec4(PixelColor*(1.0-Density*0.35), Alpha*clamp(1.0-CloudTile*uDetailAttenuation, 0.0, 1.0));
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#ifdef LDR
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gl_FragColor.xyz = vec3(1.0 - exp(-uExposure * gl_FragColor.xyz));
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#else // HDR
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gl_FragColor.xyz *= pow(uExposure, 0.5);
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#endif
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}
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