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;;; Chickadee Game Toolkit
;;; Copyright © 2016, 2018, 2021 David Thompson <davet@gnu.org>
;;;
;;; Chickadee is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published
;;; by the Free Software Foundation, either version 3 of the License,
;;; or (at your option) any later version.
;;;
;;; Chickadee is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Colors!
;;
;;; Code:
(define-module (chickadee graphics color)
#:use-module (chickadee graphics engine)
#:use-module (chickadee graphics gl)
#:use-module (chickadee math)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-1)
#:export (make-color
make-color8
color?
color-r
color-g
color-b
color-a
rgba
rgb
transparency
string->color
color*
color+
color-
color-inverse
color-lerp
white
black
red
green
blue
yellow
magenta
cyan
tango-light-butter
tango-butter
tango-dark-butter
tango-light-orange
tango-orange
tango-dark-orange
tango-light-chocolate
tango-chocolate
tango-dark-chocolate
tango-light-chameleon
tango-chameleon
tango-dark-chameleon
tango-light-sky-blue
tango-sky-blue
tango-dark-sky-blue
tango-light-plum
tango-plum
tango-dark-plum
tango-light-scarlet-red
tango-scarlet-red
tango-dark-scarlet-red
tango-aluminium-1
tango-aluminium-2
tango-aluminium-3
tango-aluminium-4
tango-aluminium-5
tango-aluminium-6
db32-black
db32-valhalla
db32-loulou
db32-oiled-cedar
db32-rope
db32-tahiti-gold
db32-twine
db32-pancho
db32-golden-fizz
db32-atlantis
db32-christi
db32-elf-green
db32-dell
db32-verdigris
db32-opal
db32-deep-koamaru
db32-venice-blue
db32-royal-blue
db32-cornflower
db32-viking
db32-light-steel-blue
db32-white
db32-heather
db32-topaz
db32-dim-gray
db32-smokey-ash
db32-clairvoyant
db32-brown
db32-mandy
db32-plum
db32-stinger
default-color-mask
null-color-mask
g:color-mask
current-color-mask
color-mask?
color-mask-red?
color-mask-green?
color-mask-blue?
color-mask-alpha?))
(define-record-type <color>
(wrap-color bv)
color?
(bv unwrap-color))
(define-inlinable (color-r color)
(f32vector-ref (unwrap-color color) 0))
(define-inlinable (color-g color)
(f32vector-ref (unwrap-color color) 1))
(define-inlinable (color-b color)
(f32vector-ref (unwrap-color color) 2))
(define-inlinable (color-a color)
(f32vector-ref (unwrap-color color) 3))
(define* (make-color r g b #:optional (a 1.0))
(wrap-color (f32vector r g b a)))
(define* (make-color8 r g b #:optional (a 255))
(make-color (/ r 255.0) (/ g 255.0) (/ b 255.0) (/ a 255.0)))
(define (color-component color-code offset)
"Return the value of an 8-bit color channel in the range [0,1] for
the integer COLOR-CODE, given an OFFSET in bits."
(let ((mask (ash #xff offset)))
(/ (ash (logand mask color-code)
(- offset))
255.0)))
(define (rgba color-code)
"Translate an RGBA format string COLOR-CODE into a color object.
For example: #xffffffff will return a color with RGBA values 1, 1, 1,
1."
(make-color (color-component color-code 24)
(color-component color-code 16)
(color-component color-code 8)
(color-component color-code 0)))
(define (rgb color-code)
"Translate an RGB format string COLOR-CODE into a color object.
For example: #xffffff will return a color with RGBA values 1, 1, 1,
1."
(make-color (color-component color-code 16)
(color-component color-code 8)
(color-component color-code 0)
1.0))
(define (transparency alpha)
"Create a new color that is white with a transparency value of
ALPHA. ALPHA is clamped to the range [0, 1]."
(make-color 1 1 1 alpha))
(define (string->color s)
"Convert the color code string S, in a format like \"#RRGGBBAA\", to
a color object."
(define (parse-digit i)
(match (string-ref s i)
(#\0 0)
(#\1 1)
(#\2 2)
(#\3 3)
(#\4 4)
(#\5 5)
(#\6 6)
(#\7 7)
(#\8 8)
(#\9 9)
((or #\a #\A) 10)
((or #\b #\B) 11)
((or #\c #\C) 12)
((or #\d #\D) 13)
((or #\e #\E) 14)
((or #\f #\F) 15)))
(define (parse-channel i)
(/ (+ (* (parse-digit i) 16)
(parse-digit (+ i 1)))
255.0))
;; Support color codes with or without a "#" prefix and with or
;; without an alpha channel.
(let* ((start (if (string-prefix? "#" s) 1 0))
(alpha? (> (string-length s) (+ start 6)))
(red (parse-channel start))
(green (parse-channel (+ start 2)))
(blue (parse-channel (+ start 4)))
(alpha (if alpha?
(parse-channel (+ start 6))
1.0)))
(make-color red green blue alpha)))
(define-inlinable (color* a b)
(if (color? b)
(make-color (* (color-r a) (color-r b))
(* (color-g a) (color-g b))
(* (color-b a) (color-b b))
(* (color-a a) (color-a b)))
;; Scalar multiplication.
(make-color (* (color-r a) b)
(* (color-g a) b)
(* (color-b a) b)
(* (color-a a) b))))
(define-inlinable (color+ a b)
(make-color (+ (color-r a) (color-r b))
(+ (color-g a) (color-g b))
(+ (color-b a) (color-b b))
(+ (color-a a) (color-a b))))
(define-inlinable (color- a b)
(make-color (- (color-r a) (color-r b))
(- (color-g a) (color-g b))
(- (color-b a) (color-b b))
(- (color-a a) (color-a b))))
(define-inlinable (color-inverse color)
(make-color (- 1.0 (color-r color))
(- 1.0 (color-g color))
(- 1.0 (color-b color))
;; Do not alter alpha channel.
(color-a color)))
(define-inlinable (color-lerp start end alpha)
(color+ (color* start (- 1.0 alpha))
(color* end alpha)))
;;;
;;; Pre-defined Colors
;;;
;; Basic
(define white (make-color 1.0 1.0 1.0))
(define black (make-color 0.0 0.0 0.0))
(define red (make-color 1.0 0.0 0.0))
(define green (make-color 0.0 1.0 0.0))
(define blue (make-color 0.0 0.0 1.0))
(define yellow (make-color 1.0 1.0 0.0))
(define magenta (make-color 1.0 0.0 1.0))
(define cyan (make-color 0.0 1.0 1.0))
;; Tango color pallete
;; http://tango.freedesktop.org
(define tango-light-butter (rgb #xfce94f))
(define tango-butter (rgb #xedd400))
(define tango-dark-butter (rgb #xc4a000))
(define tango-light-orange (rgb #xfcaf3e))
(define tango-orange (rgb #xf57900))
(define tango-dark-orange (rgb #xce5c00))
(define tango-light-chocolate (rgb #xe9b96e))
(define tango-chocolate (rgb #xc17d11))
(define tango-dark-chocolate (rgb #x8f5902))
(define tango-light-chameleon (rgb #x8ae234))
(define tango-chameleon (rgb #x73d216))
(define tango-dark-chameleon (rgb #x4e9a06))
(define tango-light-sky-blue (rgb #x729fcf))
(define tango-sky-blue (rgb #x3465a4))
(define tango-dark-sky-blue (rgb #x204a87))
(define tango-light-plum (rgb #xad7fa8))
(define tango-plum (rgb #x75507b))
(define tango-dark-plum (rgb #x5c3566))
(define tango-light-scarlet-red (rgb #xef2929))
(define tango-scarlet-red (rgb #xcc0000))
(define tango-dark-scarlet-red (rgb #xa40000))
(define tango-aluminium-1 (rgb #xeeeeec))
(define tango-aluminium-2 (rgb #xd3d7cf))
(define tango-aluminium-3 (rgb #xbabdb6))
(define tango-aluminium-4 (rgb #x888a85))
(define tango-aluminium-5 (rgb #x555753))
(define tango-aluminium-6 (rgb #x2e3436))
;; DawnBringer 32 color palette
;; http://pixeljoint.com/forum/forum_posts.asp?TID=16247
;; Color names taken from: http://privat.bahnhof.se/wb364826/pic/db32.gpl
(define db32-black (make-color8 0 0 0))
(define db32-valhalla (make-color8 34 32 52))
(define db32-loulou (make-color8 69 40 60))
(define db32-oiled-cedar (make-color8 102 57 49))
(define db32-rope (make-color8 143 86 59))
(define db32-tahiti-gold (make-color8 223 113 38))
(define db32-twine (make-color8 217 160 102))
(define db32-pancho (make-color8 238 195 154))
(define db32-golden-fizz (make-color8 251 242 54))
(define db32-atlantis (make-color8 153 229 80))
(define db32-christi (make-color8 106 190 48))
(define db32-elf-green (make-color8 55 148 110))
(define db32-dell (make-color8 75 105 47))
(define db32-verdigris (make-color8 82 75 36))
(define db32-opal (make-color8 50 60 57))
(define db32-deep-koamaru (make-color8 63 63 116))
(define db32-venice-blue (make-color8 48 96 130))
(define db32-royal-blue (make-color8 91 110 225))
(define db32-cornflower (make-color8 99 155 255))
(define db32-viking (make-color8 95 205 228))
(define db32-light-steel-blue (make-color8 203 219 252))
(define db32-white (make-color8 255 255 255))
(define db32-heather (make-color8 155 173 183))
(define db32-topaz (make-color8 132 126 135))
(define db32-dim-gray (make-color8 105 106 106))
(define db32-smokey-ash (make-color8 89 86 82))
(define db32-clairvoyant (make-color8 118 66 138))
(define db32-brown (make-color8 172 50 50))
(define db32-mandy (make-color8 217 87 99))
(define db32-plum (make-color8 215 123 186))
(define db32-rain-forest (make-color8 143 151 74))
(define db32-stinger (make-color8 138 111 48))
;;;
;;; Color Masks
;;;
(define-record-type <color-mask>
(make-color-mask red? green? blue? alpha?)
color-mask?
(red? color-mask-red?)
(green? color-mask-green?)
(blue? color-mask-blue?)
(alpha? color-mask-alpha?))
(define default-color-mask (make-color-mask #t #t #t #t))
(define null-color-mask (make-color-mask #f #f #f #f))
(define (bind-color-mask mask)
(gl-color-mask (color-mask-red? mask)
(color-mask-green? mask)
(color-mask-blue? mask)
(color-mask-alpha? mask)))
(define-graphics-state g:color-mask
current-color-mask
#:default default-color-mask
#:bind bind-color-mask)
|