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UI|Shaders|Client: Home background tinting
Columns that are not highlighted are desaturated to reduce the number of colors visible at once (too much noise). The client's renderer.pack now has a new "include/hsv.glsl" for HSV color calculations.
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123 changes: 123 additions & 0 deletions
123
doomsday/apps/client/net.dengine.client.pack/renderer.pack/shaders/include/hsv.glsl
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| * The Doomsday Engine Project | ||
| * Common OpenGL Shaders: HSV/RGB Color Conversions | ||
| * | ||
| * Copyright (c) 2016 Jaakko Keränen <jaakko.keranen@iki.fi> | ||
| * | ||
| * @par License | ||
| * LGPL: http://www.gnu.org/licenses/lgpl.html | ||
| * | ||
| * <small>This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation; either version 3 of the License, or (at your | ||
| * option) any later version. This program 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 Lesser | ||
| * General Public License for more details. You should have received a copy of | ||
| * the GNU Lesser General Public License along with this program; if not, see: | ||
| * http://www.gnu.org/licenses</small> | ||
| */ | ||
|
|
||
| /** | ||
| * Converts an RGBA value to HSVA. Hue uses degrees as the unit. | ||
| */ | ||
| highp vec4 rgbToHsv(highp vec4 rgb) | ||
| { | ||
| highp vec4 hsv; | ||
| hsv.a = rgb.a; | ||
|
|
||
| highp float rgbMin = min(min(rgb.r, rgb.g), rgb.b); | ||
| highp float rgbMax = max(max(rgb.r, rgb.g), rgb.b); | ||
| highp float delta = rgbMax - rgbMin; | ||
|
|
||
| hsv.z = rgbMax; | ||
|
|
||
| if (delta < 0.00001) | ||
| { | ||
| hsv.xy = vec2(0.0); | ||
| return hsv; | ||
| } | ||
|
|
||
| if (rgbMax > 0.0) | ||
| { | ||
| hsv.y = delta / rgbMax; | ||
| } | ||
| else | ||
| { | ||
| hsv.xy = vec2(0.0); | ||
| return hsv; | ||
| } | ||
|
|
||
| if (rgb.r >= rgbMax) | ||
| { | ||
| hsv.x = (rgb.g - rgb.b) / delta; | ||
| } | ||
| else | ||
| { | ||
| if (rgb.g >= rgbMax) | ||
| { | ||
| hsv.x = 2.0 + (rgb.b - rgb.r) / delta; | ||
| } | ||
| else | ||
| { | ||
| hsv.x = 4.0 + (rgb.r - rgb.g) / delta; | ||
| } | ||
| } | ||
|
|
||
| hsv.x *= 60.0; | ||
| if (hsv.x < 0.0) | ||
| { | ||
| hsv.x += 360.0; | ||
| } | ||
| return hsv; | ||
| } | ||
|
|
||
| highp vec4 hsvToRgb(highp vec4 hsv) | ||
| { | ||
| highp vec4 rgb; | ||
| rgb.a = hsv.a; | ||
|
|
||
| if (hsv.y <= 0.0) | ||
| { | ||
| rgb.rgb = vec3(hsv.z); | ||
| return rgb; | ||
| } | ||
|
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| highp float hh = hsv.x; | ||
| if (hh >= 360.0) hh = 0.0; | ||
| hh /= 60.0; | ||
|
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| highp float ff = fract(hh); | ||
| highp float p = hsv.z * (1.0 - hsv.y); | ||
| highp float q = hsv.z * (1.0 - (hsv.y * ff)); | ||
| highp float t = hsv.z * (1.0 - (hsv.y * (1.0 - ff))); | ||
|
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| int i = int(hh); | ||
|
|
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| if (i == 0) | ||
| { | ||
| rgb.rgb = vec3(hsv.z, t, p); | ||
| } | ||
| else if (i == 1) | ||
| { | ||
| rgb.rgb = vec3(q, hsv.z, p); | ||
| } | ||
| else if (i == 2) | ||
| { | ||
| rgb.rgb = vec3(p, hsv.z, t); | ||
| } | ||
| else if (i == 3) | ||
| { | ||
| rgb.rgb = vec3(p, q, hsv.z); | ||
| } | ||
| else if (i == 4) | ||
| { | ||
| rgb.rgb = vec3(t, p, hsv.z); | ||
| } | ||
| else | ||
| { | ||
| rgb.rgb = vec3(hsv.z, p, q); | ||
| } | ||
|
|
||
| return rgb; | ||
| } |
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