80 lines
2.9 KiB
Plaintext
80 lines
2.9 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 moon material ------------------------
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// ----------------------- GLSL Fragment ---------------------------
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// IN
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varying vec4 vUVYLength;
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// UNIFORM
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uniform vec3 uMoonPhase;
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uniform vec3 uMoonHalo1;
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uniform vec3 uMoonHalo2;
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uniform float uMoonHaloFlip;
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uniform sampler2D uMoon;
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uniform sampler2D uMoonHalo;
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void main(void)
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{
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// Output color
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gl_FragColor = texture2D(uMoon, vUVYLength.xy);
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// Moon phase + halo
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float radius = abs(uMoonPhase.x);
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vec2 center = vec2(uMoonPhase.y, 0.5);
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float dist = length(vUVYLength.xy - center);
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float att = clamp((radius-dist+0.015)*40.0, 0.0, 1.0);
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float UVYLength_x = vUVYLength.x; // GLSL warns about varying assignments
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if (uMoonHaloFlip > 0.5)
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{
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UVYLength_x = 1.0-vUVYLength.x;
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}
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vec2 haloUV = vec2(UVYLength_x/4.0, vUVYLength.y/2.0);
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vec2 halo1UV = vec2(uMoonHalo1.x + haloUV.x, uMoonHalo1.y + haloUV.y);
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vec2 halo2UV = vec2(uMoonHalo2.x + haloUV.x, uMoonHalo2.y + haloUV.y);
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float haloIntensity = texture2D(uMoonHalo, halo1UV).w*uMoonHalo1.z + texture2D(uMoonHalo, halo2UV).w*uMoonHalo2.z;
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haloIntensity = pow(haloIntensity, uMoonPhase.z);
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if (uMoonPhase.x > 0.0)
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{
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gl_FragColor.rgb *= 0.16 + (1.0-0.16)*(1.0-att);
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gl_FragColor.rgb += clamp(haloIntensity-gl_FragColor.r, 0.0, 1.0)*(1.0-(1.0-att)*gl_FragColor.a);
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}
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else
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{
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gl_FragColor.rgb *= 0.16 + (1.0-0.16)*att;
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gl_FragColor.rgb += clamp(haloIntensity-gl_FragColor.r, 0.0, 1.0)*(1.0-att*gl_FragColor.a);
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}
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gl_FragColor.rgb += (1.0-gl_FragColor.a)*1.4*(1.0-pow(gl_FragColor.a,2.0*haloIntensity)); // Anti-alias at moon edges hack
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gl_FragColor.rgb = clamp(gl_FragColor.rgb, 0.0, 1.0);
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gl_FragColor.a = max(gl_FragColor.a, haloIntensity);
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// Transparency at horizon
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gl_FragColor.w *= clamp((vUVYLength.z/vUVYLength.w)*10.0, 0.0, 1.0);
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}
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