49 lines
1.5 KiB
GLSL
49 lines
1.5 KiB
GLSL
// osgOcean Uniforms
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// -----------------
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uniform mat4 osg_ViewMatrixInverse;
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uniform float osgOcean_WaterHeight;
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uniform vec3 osgOcean_Eye;
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uniform vec3 osgOcean_UnderwaterAttenuation;
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uniform vec4 osgOcean_UnderwaterDiffuse;
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uniform bool osgOcean_EnableUnderwaterScattering;
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// -----------------
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varying vec3 vExtinction;
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varying vec3 vInScattering;
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varying vec3 vNormal;
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varying vec3 vLightDir;
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varying vec3 vEyeVec;
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varying float vWorldHeight;
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void computeScattering( in vec3 eye, in vec3 worldVertex, out vec3 extinction, out vec3 inScattering )
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{
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float viewDist = length(eye-worldVertex);
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float depth = max(osgOcean_WaterHeight-worldVertex.z, 0.0);
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extinction = exp(-osgOcean_UnderwaterAttenuation*viewDist*2.0);
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// Need to compute accurate kd constant.
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// const vec3 kd = vec3(0.001, 0.001, 0.001);
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inScattering = osgOcean_UnderwaterDiffuse.rgb * (1.0-extinction*exp(-depth*vec3(0.001)));
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}
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void main(void)
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{
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gl_TexCoord[0] = gl_MultiTexCoord0;
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gl_Position = ftransform();
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gl_FogFragCoord = gl_Position.z;
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gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex; // for reflections
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vNormal = gl_NormalMatrix * gl_Normal;
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vLightDir = gl_LightSource[osgOcean_LightID].position.xyz;
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vEyeVec = -vec3(gl_ModelViewMatrix*gl_Vertex);
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vec4 worldVertex = (osg_ViewMatrixInverse*gl_ModelViewMatrix) * gl_Vertex;
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if (osgOcean_EnableUnderwaterScattering)
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computeScattering( osgOcean_Eye, worldVertex.xyz, vExtinction, vInScattering);
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vWorldHeight = worldVertex.z;
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} |