diff options
| author | yum <yum.food.vr@gmail.com> | 2025-02-20 19:57:54 -0800 |
|---|---|---|
| committer | yum <yum.food.vr@gmail.com> | 2025-02-20 19:57:54 -0800 |
| commit | 72806ff9f71bd98973f51a4b67de00c056fe8d89 (patch) | |
| tree | 2a7d1ed7a8cbb563ed79ef18e363ef3b4efccd3a /oklab.cginc | |
| parent | 14cdf12e17d2b17676135457e42bde391ff3f313 (diff) | |
add eye shader
Diffstat (limited to 'oklab.cginc')
| -rw-r--r-- | oklab.cginc | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/oklab.cginc b/oklab.cginc new file mode 100644 index 0000000..c5f87f6 --- /dev/null +++ b/oklab.cginc @@ -0,0 +1,120 @@ +/*
+ * MIT License
+ *
+ * Copyright (c) 2023-2025 yum_food
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE
+ * SOFTWARE.
+ */
+
+#ifndef __OKLAB_INC
+#define __OKLAB_INC
+
+#if defined(_EYE_EFFECT_00)
+
+// Utilities relating to the OKLAB color space, as defined here:
+// https://bottosson.github.io/posts/oklab/
+// Code is derived from the samples there, which are in the public domain.
+
+// Weights: https://en.wikipedia.org/wiki/SRGB
+float3 LRGBtoXYZ(float3 c) {
+ float3x3 rgb_to_xyz = float3x3(
+ 0.4124, 0.3576, 0.1805,
+ 0.2126, 0.7152, 0.0722,
+ 0.0193, 0.1192, 0.9505);
+ return saturate(mul(rgb_to_xyz, c));
+}
+
+// Weights: https://en.wikipedia.org/wiki/SRGB
+float3 XYZtoLRGB(float3 c) {
+ float3x3 xyz_to_rgb = float3x3(
+ 3.24062548, -1.53720797, -0.4986286,
+ -0.96893071, 1.87575606, 0.04151752,
+ 0.05571012, -0.20402105, 1.05699594);
+ return saturate(mul(xyz_to_rgb, c));
+}
+
+// Source: https://bottosson.github.io/posts/oklab/
+float3 XYZtoOKLAB(float3 c) {
+ float3x3 m1 = float3x3(
+ 0.8189330101, 0.3618667424, -0.1288597137,
+ 0.0329845436, 0.9293118715, 0.0361456387,
+ 0.0482003018, 0.2643662691, 0.6338517070);
+ float3x3 m2 = float3x3(
+ 0.2104542553, 0.7936177850, -0.0040720468,
+ 1.9779984951, -2.4285922050, 0.4505937099,
+ 0.0259040371, 0.7827717662, -0.8086757660);
+ c = mul(m1, c);
+ c = pow(c, 0.33333333333);
+ return mul(m2, c);
+}
+
+// Source: https://bottosson.github.io/posts/oklab/
+float3 OKLABtoXYZ(float3 c) {
+ float3x3 m1i = float3x3(
+ 1.22701385, -0.55779998, 0.28125615,
+ -0.04058018, 1.11225687, -0.07167668,
+ -0.07638128, -0.42148198, 1.58616322);
+ float3x3 m2i = float3x3(
+ 1.00000000, 0.39633779, 0.21580376,
+ 1.00000001, -0.10556134, -0.06385417,
+ 1.00000005, -0.08948418, -1.29148554);
+ c = mul(m2i, c);
+ c = pow(c, 3.0);
+ return mul(m1i, c);
+}
+
+// Source: https://bottosson.github.io/posts/oklab/
+float3 OKLABtoOKLCH(float3 c) {
+ float c_ = length(c.yz);
+ float h_ = atan2(c.z, c.y);
+ return float3(c.x, c_, h_);
+}
+
+// Source: https://bottosson.github.io/posts/oklab/
+// Note: hue must be in units of radians.
+float3 OKLCHtoOKLAB(float3 c) {
+ float a = c.y * cos(c.z);
+ float b = c.y * sin(c.z);
+ return float3(c.x, a, b);
+}
+
+float3 LRGBtoOKLAB(float3 c) {
+ return XYZtoOKLAB(LRGBtoXYZ(c));
+}
+
+float3 OKLABtoLRGB(float3 c) {
+ return XYZtoLRGB(OKLABtoXYZ(c));
+}
+
+float3 LRGBtoOKLCH(float3 c) {
+ return OKLABtoOKLCH(XYZtoOKLAB(LRGBtoXYZ(c)));
+}
+
+float3 OKLCHtoLRGB(float3 c) {
+ return XYZtoLRGB(OKLABtoXYZ(OKLCHtoOKLAB(c)));
+}
+
+#endif // _OKLAB
+
+#endif // __OKLAB_INC
+
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