42 lines
961 B
GLSL
42 lines
961 B
GLSL
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// -*-C++-*-
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#version 120
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// Shader that uses OpenGL state values to do per-pixel lighting
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uniform float size;
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uniform float max_size;
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uniform bool is_directional;
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varying vec3 relPos;
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varying vec2 rawPos;
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varying float pixelSize;
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bool light_directional = true;
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void main()
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{
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gl_FrontColor= gl_Color;
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gl_Position = ftransform();
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vec4 ep = gl_ModelViewMatrixInverse * vec4(0.0,0.0,0.0,1.0);
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relPos = gl_Vertex.xyz - ep.xyz;
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rawPos = gl_Vertex.xy;
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float dist = length(relPos);
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float angular_fade = 1.0;
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if (is_directional)
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{
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angular_fade = 2.0 * max(0.0,-dot(normalize(gl_Normal), normalize(relPos)));
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}
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float size_use = size;
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if (size_use < 10.0) {size_use = 20.0;}
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float lightScale = size_use * size_use * size_use * size_use * size_use/ 500.0 *angular_fade;
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pixelSize = min(size_use * size_use/25.0,lightScale/dist) ;
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pixelSize = min(pixelSize, max_size);
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gl_PointSize = 2.0 * pixelSize;
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}
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