Color Range Swap [UPDATED]
hey! nonunknown here, I’m a begginner in shaders, and sharing my first one here! which was inspired by GIMP’s color rotate!
Usage:
* Change _min and _max to get the range of the source color.
* color is the target color to convert to the source range.
*Can be applied to Sprites,Control Deriveds, Backbuffer!
Shader code
shader_type canvas_item;
uniform float _min;
uniform float _max;
uniform vec4 color : hint_color;
vec3 rgb2hsv(vec3 c)
{
vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
float d = q.x - min(q.w, q.y);
float e = 1.0e-10;
return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
}
// All components are in the range [0…1], including hue.
vec3 hsv2rgb(vec3 c)
{
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
// ===== got those from: https://gamedev.stackexchange.com/a/75928
vec4 to_gray(vec4 tex)
{
float avg = (tex.r + tex.g + tex.b) / 3.0;
return vec4(vec3(avg),tex.a);
}
vec4 to_color(vec4 gray, vec4 col)
{
return gray * col;
}
// ===== end
void fragment()
{
vec4 tex = texture(TEXTURE, UV);
vec3 hsv = rgb2hsv(tex.rgb);
// the .r here represents HUE, .g is SATURATION, .b is LUMINANCE
if (hsv.r >= _min && hsv.r <= _max)
{
tex = to_gray(tex);
tex = to_color(tex, color);
}
COLOR = tex;
}
Hey, with the release of Godot 4 hint_color needs to be replaced with source_color.
For Godot 4, use this code.