lygia/color/contrastMatrix)generate a matrix to change a the contrast of any color
Use:
contrastMatrix(<float> amount)
#ifndef FNC_CONTRASTMATRIX
#define FNC_CONTRASTMATRIX
mat4 contrastMatrix(in float a) {
float t = ( 1. - a ) * .5;
return mat4( a, .0, .0, .0,
.0, a, .0, .0,
.0, .0, a, .0,
t, t, t, 1. );
}
#endif
Use:
contrastMatrix(<float> amount)
#ifndef FNC_CONTRASTMATRIX
#define FNC_CONTRASTMATRIX
float4x4 contrastMatrix(in float amount) {
float t = ( 1. - amount ) * .5;
return float4x4( amount, .0, .0, t,
.0, amount, .0, t,
.0, .0, amount, t,
.0, .0, .0, 1. );
}
#endif
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