41 lines
1.3 KiB
GLSL
41 lines
1.3 KiB
GLSL
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#version 330 core
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out vec4 fragColor;
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in vec3 rayDirVertex;
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uniform mat4 osg_ModelViewMatrix;
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uniform mat4 osg_ViewMatrix;
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uniform vec3 fg_SunDirection;
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vec3 calculateScattering(vec3 rayOrigin,
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vec3 rayDir,
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vec3 sceneColor,
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float depth,
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float maxDist,
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float earthRadius,
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vec3 lightDir);
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void main()
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{
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// Ground point (skydome center) in eye coordinates
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vec4 groundPoint = inverse(osg_ViewMatrix) * osg_ModelViewMatrix
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* vec4(0.0, 0.0, 0.0, 1.0);
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// HACK: WGS84 models the Earth as an oblate spheroid, so we can't use
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// a constant Earth radius. This should be precomputed!
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float earthRadius = length(groundPoint);
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vec3 cameraPos = vec4(inverse(osg_ViewMatrix) * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
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vec3 rayDir = normalize(rayDirVertex);
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vec3 color = calculateScattering(cameraPos,
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rayDir,
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vec3(0.0),
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1.0,
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3.0 * earthRadius,
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earthRadius,
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fg_SunDirection);
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fragColor = vec4(color, 1.0);
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}
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