44 lines
794 B
GLSL
44 lines
794 B
GLSL
//! type library
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const float PI = 3.14159265;
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// -----------------------------------------------------------------------------
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float M_Hash(
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in vec2 p )
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{
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p = fract(p * vec2(5.3987, 5.4421));
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p += dot(p.yx, p.xy + vec2(21.5351, 14.3137));
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return fract(p.x * p.y * 95.4307);
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}
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// -----------------------------------------------------------------------------
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float M_Luminosity(
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in vec3 color )
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{
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return dot( color , vec3( .299 , .587 , .114 ) );
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}
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vec3 M_NormalizeColor(
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in vec3 color )
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{
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const float l = M_Luminosity( color );
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return l > 0 ? ( color / l ) : vec3( 1 );
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}
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// -----------------------------------------------------------------------------
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float M_Saturate(
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in float x )
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{
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return clamp( x , 0 , 1 );
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}
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float M_LengthSqr(
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in vec3 x )
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{
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return dot( x , x );
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}
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