77 lines
No EOL
2.4 KiB
GLSL
77 lines
No EOL
2.4 KiB
GLSL
// This shader is mostly an adaptation of the shader found at
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// http://www.bonzaisoftware.com/water_tut.html and its glsl conversion
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// available at http://forum.bonzaisoftware.com/viewthread.php?tid=10
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// © Michael Horsch - 2005
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#version 120
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#define fps2kts 0.5925
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varying vec4 waterTex1;
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varying vec4 waterTex2;
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varying vec4 waterTex4;
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varying vec4 ecPosition;
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varying vec3 viewerdir;
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varying vec3 lightdir;
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varying vec3 normal;
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uniform float osg_SimulationTime;
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uniform float WindE, WindN, spd, hdg;
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////fog "include"////////
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uniform int fogType;
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void fog_Func(int type);
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/////////////////////////
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/////// functions /////////
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void relWind(out float rel_wind_speed_kts, float rel_wind_from_deg)
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{
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//calculate the carrier speed north and east in kts
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float speed_north_kts = cos(radians(hdg)) * spd ;
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float speed_east_kts = sin(radians(hdg)) * spd ;
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//calculate the relative wind speed north and east in kts
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float rel_wind_speed_from_east_kts = WindE*fps2kts + speed_east_kts;
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float rel_wind_speed_from_north_kts = WindN*fps2kts + speed_north_kts;
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//combine relative speeds north and east to get relative windspeed in kts
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rel_wind_speed_kts = sqrt((rel_wind_speed_from_east_kts * rel_wind_speed_from_east_kts) + (rel_wind_speed_from_north_kts * rel_wind_speed_from_north_kts));
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//calculate the relative wind direction
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rel_wind_from_deg = degrees(atan(rel_wind_speed_from_east_kts, rel_wind_speed_from_north_kts));
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}
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void main(void)
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{
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float relWindspd=0;
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float relWinddir=0;
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//compute relative wind speed and direction
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relWind (relWindspd, relWinddir);
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vec3 N = normalize(gl_Normal);
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normal = N;
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ecPosition = gl_ModelViewMatrix * gl_Vertex;
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viewerdir = vec3(gl_ModelViewMatrixInverse[3]) - vec3(gl_Vertex);
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lightdir = normalize(vec3(gl_ModelViewMatrixInverse * gl_LightSource[0].position));
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waterTex4 = vec4( ecPosition.xzy, 0.0 );
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vec4 t1 = vec4(osg_SimulationTime*0.005217, 0.0, 0.0, 0.0);
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vec4 t2 = vec4(osg_SimulationTime*-0.0012, 0.0, 0.0, 0.0);
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float windFactor = -relWindspd * 0.1;
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// float windFactor = sqrt(pow(abs(WindE),2)+pow(abs(WindN),2)) * 0.6;
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waterTex1 = gl_MultiTexCoord0 + t1 * windFactor;
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waterTex2 = gl_MultiTexCoord0 + t2 * windFactor;
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gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
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gl_Position = ftransform();
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fog_Func(fogType);
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} |