78 lines
3.1 KiB
Plaintext
78 lines
3.1 KiB
Plaintext
/*
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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 Verguín González <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 skydome material ------------------------
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// ------------------------ GLSL Fragment -----------------------------
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// IN
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varying vec2 vUV;
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varying vec3 vRayleighColor;
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varying vec3 vMieColor;
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varying vec3 vDirection;
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varying float vOpacity;
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varying float vHeight;
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// OUT
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// UNIFORM
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uniform float uTime;
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uniform vec3 uLightDir;
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// Phase function
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uniform float uG;
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uniform float uG2;
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// Exposure
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uniform float uExposure;
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uniform sampler2D uStarfield;
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void main(void)
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{
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float cos = dot(uLightDir, vDirection) / length(vDirection);
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float cos2 = cos*cos;
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float rayleighPhase = 0.75 * (1.0 + 0.5*cos2);
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float miePhase = 1.5 * ((1.0 - uG2) / (2.0 + uG2)) * // <<< TODO
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(1.0 + cos2) / pow(1.0 + uG2 - 2.0 * uG * cos, 1.5);
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#ifdef LDR
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gl_FragColor = vec4((1.0 - exp(-uExposure * (rayleighPhase * vRayleighColor + miePhase * vMieColor))), vOpacity);
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#else // HDR
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gl_FragColor = vec4(uExposure*(rayleighPhase * vRayleighColor + miePhase * vMieColor), vOpacity);
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#endif // LDR
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// For night rendering
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float nightmult = clamp(1.0 - max(gl_FragColor.x, max(gl_FragColor.y, gl_FragColor.z))*10.0, 0.0, 1.0);
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#ifdef STARFIELD
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#ifdef LDR
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gl_FragColor.xyz += nightmult *(vec3(0.05, 0.05, 0.1)*(2.0-0.75*clamp(-uLightDir.y, 0.0, 1.0))*pow(vHeight, 3.0) + texture2D(uStarfield, vUV+uTime).xyz*(0.35 + clamp(-uLightDir.y*0.45, 0.0, 1.0)));
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#else // HDR (Linear pipeline -> Gamma correction)
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gl_FragColor.xyz += nightmult * (pow(vec3(0.05, 0.05, 0.1) * (2.0-0.75*clamp(-uLightDir.y, 0.0, 1.0))*pow(vHeight, 3.0), vec3(2.2, 2.2, 2.2)) + texture2D(uStarfield, vUV+uTime).xyz*(0.35 + clamp(-uLightDir.y*0.45, 0.0, 1.0)));
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#endif // LDR
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#else // NO STARFIELD
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#ifdef LDR
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gl_FragColor.xyz += nightmult *(vec3(0.05, 0.05, 0.1)*(2.0-0.75*clamp(-uLightDir.y, 0.0, 1.0))*pow(vHeight,3.0));
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#else // HDR (Linear pipeline -> Gamma correction)
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gl_FragColor.xyz += nightmult * pow(vec3(0.05, 0.05, 0.1)*(2.0-0.75*clamp(-uLightDir.y, 0.0, 1.0))*pow(vHeight,3.0), vec3(2.2, 2.2, 2.2));
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#endif // LDR
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#endif // STARFIELD
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}
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