90 lines
2.9 KiB
C#
90 lines
2.9 KiB
C#
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using UnityEngine;
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using UnityEditor;
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class TextureModifier : AssetPostprocessor {
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void OnPostprocessTexture (Texture2D texture){
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if (!assetPath.EndsWith ("Dither.png")) {
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return;
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}
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var texw = texture.width;
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var texh = texture.height;
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var pixels = texture.GetPixels ();
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var offs = 0;
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var k1Per15 = 1.0f / 15.0f;
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var k1Per16 = 1.0f / 16.0f;
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var k3Per16 = 3.0f / 16.0f;
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var k5Per16 = 5.0f / 16.0f;
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var k7Per16 = 7.0f / 16.0f;
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for (var y = 0; y < texh; y++) {
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for (var x = 0; x < texw; x++) {
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float a = pixels [offs].a;
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float r = pixels [offs].r;
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float g = pixels [offs].g;
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float b = pixels [offs].b;
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var a2 = Mathf.Clamp01 (Mathf.Floor (a * 16) * k1Per15);
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var r2 = Mathf.Clamp01 (Mathf.Floor (r * 16) * k1Per15);
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var g2 = Mathf.Clamp01 (Mathf.Floor (g * 16) * k1Per15);
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var b2 = Mathf.Clamp01 (Mathf.Floor (b * 16) * k1Per15);
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var ae = a - a2;
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var re = r - r2;
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var ge = g - g2;
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var be = b - b2;
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pixels [offs].a = a2;
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pixels [offs].r = r2;
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pixels [offs].g = g2;
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pixels [offs].b = b2;
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var n1 = offs + 1;
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var n2 = offs + texw - 1;
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var n3 = offs + texw;
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var n4 = offs + texw + 1;
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if (x < texw - 1) {
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pixels [n1].a += ae * k7Per16;
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pixels [n1].r += re * k7Per16;
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pixels [n1].g += ge * k7Per16;
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pixels [n1].b += be * k7Per16;
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}
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if (y < texh - 1) {
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pixels [n3].a += ae * k5Per16;
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pixels [n3].r += re * k5Per16;
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pixels [n3].g += ge * k5Per16;
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pixels [n3].b += be * k5Per16;
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if (x > 0) {
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pixels [n2].a += ae * k3Per16;
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pixels [n2].r += re * k3Per16;
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pixels [n2].g += ge * k3Per16;
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pixels [n2].b += be * k3Per16;
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}
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if (x < texw - 1) {
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pixels [n4].a += ae * k1Per16;
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pixels [n4].r += re * k1Per16;
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pixels [n4].g += ge * k1Per16;
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pixels [n4].b += be * k1Per16;
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}
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}
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offs++;
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}
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}
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texture.SetPixels (pixels);
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#if UNITY_2018_1_OR_NEWER
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EditorUtility.CompressTexture (texture, TextureFormat.RGBA4444, UnityEditor.TextureCompressionQuality.Best);
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#else
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EditorUtility.CompressTexture (texture, TextureFormat.RGBA4444, TextureCompressionQuality.Best);
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#endif
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}
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}
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