ddnet/src/base/color.h

168 lines
2.7 KiB
C

#ifndef BASE_COLOR_H
#define BASE_COLOR_H
#include "math.h"
#include "vmath.h"
/*
Title: Color handling
*/
/*
Function: HueToRgb
Converts Hue to RGB
*/
inline float HueToRgb(float v1, float v2, float h)
{
if(h < 0.0f) h += 1;
if(h > 1.0f) h -= 1;
if((6.0f * h) < 1.0f) return v1 + (v2 - v1) * 6.0f * h;
if((2.0f * h) < 1.0f) return v2;
if((3.0f * h) < 2.0f) return v1 + (v2 - v1) * ((2.0f/3.0f) - h) * 6.0f;
return v1;
}
inline float RgbToHue(vec3 rgb)
{
float h_min = min(min(rgb.r, rgb.g), rgb.b);
float h_max = max(max(rgb.r, rgb.g), rgb.b);
float hue = 0.0f;
if(h_max == rgb.r)
hue = (rgb.g-rgb.b) / (h_max-h_min);
else if(h_max == rgb.g)
hue = 2.0f + (rgb.b-rgb.r) / (h_max-h_min);
else
hue = 4.0f + (rgb.r-rgb.g) / (h_max-h_min);
hue /= 6.0f;
if(hue < 0.0f)
hue += 1.0f;
return hue;
}
/*
Function: HslToRgb
Converts HSL to RGB
*/
inline vec3 HslToRgb(vec3 HSL)
{
if(HSL.s == 0.0f)
return vec3(HSL.l, HSL.l, HSL.l);
else
{
float v2 = HSL.l < 0.5f ? HSL.l * (1.0f + HSL.s) : (HSL.l+HSL.s) - (HSL.s*HSL.l);
float v1 = 2.0f * HSL.l - v2;
return vec3(HueToRgb(v1, v2, HSL.h + (1.0f/3.0f)), HueToRgb(v1, v2, HSL.h), HueToRgb(v1, v2, HSL.h - (1.0f/3.0f)));
}
}
inline vec3 HsvToRgb(vec3 hsv)
{
int h = int(hsv.x * 6.0f);
float f = hsv.x * 6.0f - h;
float p = hsv.z * (1.0f - hsv.y);
float q = hsv.z * (1.0f - hsv.y * f);
float t = hsv.z * (1.0f - hsv.y * (1.0f - f));
vec3 rgb = vec3(0.0f, 0.0f, 0.0f);
switch(h % 6)
{
case 0:
rgb.r = hsv.z;
rgb.g = t;
rgb.b = p;
break;
case 1:
rgb.r = q;
rgb.g = hsv.z;
rgb.b = p;
break;
case 2:
rgb.r = p;
rgb.g = hsv.z;
rgb.b = t;
break;
case 3:
rgb.r = p;
rgb.g = q;
rgb.b = hsv.z;
break;
case 4:
rgb.r = t;
rgb.g = p;
rgb.b = hsv.z;
break;
case 5:
rgb.r = hsv.z;
rgb.g = p;
rgb.b = q;
break;
}
return rgb;
}
inline vec3 RgbToHsv(vec3 rgb)
{
float h_min = min(min(rgb.r, rgb.g), rgb.b);
float h_max = max(max(rgb.r, rgb.g), rgb.b);
// hue
float hue = 0.0f;
if(h_max == h_min)
hue = 0.0f;
else if(h_max == rgb.r)
hue = (rgb.g-rgb.b) / (h_max-h_min);
else if(h_max == rgb.g)
hue = 2.0f + (rgb.b-rgb.r) / (h_max-h_min);
else
hue = 4.0f + (rgb.r-rgb.g) / (h_max-h_min);
hue /= 6.0f;
if(hue < 0.0f)
hue += 1.0f;
// saturation
float s = 0.0f;
if(h_max != 0.0f)
s = (h_max - h_min)/h_max;
// lightness
float l = h_max;
return vec3(hue, s, l);
}
/*
Function: HexToRgba
Converts Hex to Rgba
Remarks: Hex should be RGBA8
*/
inline vec4 HexToRgba(int hex)
{
vec4 c;
c.r = ((hex >> 24) & 0xFF) / 255.0f;
c.g = ((hex >> 16) & 0xFF) / 255.0f;
c.b = ((hex >> 8) & 0xFF) / 255.0f;
c.a = (hex & 0xFF) / 255.0f;
return c;
}
#endif