114 lines
1.5 KiB
GLSL
114 lines
1.5 KiB
GLSL
//! type library
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const float PI = 3.1415926535;
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const float TAU = 2 * PI;
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const float PHI = sqrt( 5 ) * .5 + .5;
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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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float M_Sqr(
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in float x )
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{
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return x * x;
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}
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vec2 M_Sqr(
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in vec2 x )
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{
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return x * x;
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}
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vec3 M_Sqr(
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in vec3 x )
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{
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return x * x;
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}
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float M_Sign(
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in float x )
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{
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return ( x < 0 ) ? -1 : 1;
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}
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vec2 M_Sign(
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in vec2 v )
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{
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return vec2( M_Sign( v.x ) , M_Sign( v.y ) );
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}
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float M_VecMax(
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in vec2 v )
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{
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return max( v.x , v.y );
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}
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float M_VecMax(
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in vec3 v )
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{
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return max( M_VecMax( v.xy ) , v.z );
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}
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float M_VecMax(
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in vec4 v )
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{
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return max( M_VecMax( v.xy ) , M_VecMax( v.zw ) );
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}
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float M_VecMin(
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in vec2 v )
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{
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return min( v.x , v.y );
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}
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float M_VecMin(
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in vec3 v )
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{
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return min( M_VecMin( v.xy ) , v.z );
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}
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float M_VecMin(
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in vec4 v )
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{
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return min( M_VecMin( v.xy ) , M_VecMin( v.zw ) );
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}
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