Implement Texture::crispBlend (#46)

* Texture::crispBlend

* Make Texture::crispBlend match

Author: AzaleaCatgirl99

data/mcswitch_functions.csv

@@ -44987,7 +44987,7 @@ Address,Quality,Size,Name
 0x000000710074ec04,U,000012,_ZN7Texture7getDataEj
 0x000000710074ec10,U,000008,_ZN7Texture9getHeightEv
 0x000000710074ec18,U,000008,_ZN7Texture8getWidthEv
-0x000000710074ec20,U,000136,_ZN7Texture10crispBlendEii
+0x000000710074ec20,O,000136,_ZN7Texture10crispBlendEii
 0x000000710074eca8,U,000008,_ZN7Texture12getManagerIdEv
 0x000000710074ecb0,U,000008,
 0x000000710074ecb8,U,000076,_ZN7Texture4bindEi

src/Minecraft.Client/net/minecraft/client/renderer/texture/Texture.cpp

@@ -0,0 +1,29 @@
+#include "net/minecraft/client/renderer/texture/Texture.h"
+
+int Texture::crispBlend(int c0, int c1) {
+    int a0 = c0 >> 24 & 255;
+    int a1 = c1 >> 24 & 255;
+    int a = 255;
+    if (a0 + a1 < 255) {
+        a0 = 1;
+        a1 = 1;
+        a = 0;
+    } else if (a0 > a1) {
+        a0 = 255;
+        a1 = 1;
+    } else {
+        a0 = 1;
+        a1 = 255;
+    }
+
+    int r0 = (c0 >> 16 & 255) * a0;
+    int g0 = (c0 >> 8 & 255) * a0;
+    int b0 = (c0 & 255) * a0;
+    int r1 = (c1 >> 16 & 255) * a1;
+    int g1 = (c1 >> 8 & 255) * a1;
+    int b1 = (c1 & 255) * a1;
+    int r = (r0 + r1) / (a0 + a1);
+    int g = (g0 + g1) / (a0 + a1);
+    int b = (b0 + b1) / (a0 + a1);
+    return a << 24 | r << 16 | g << 8 | b;
+}

src/Minecraft.Client/net/minecraft/client/renderer/texture/Texture.h

@@ -18,7 +18,7 @@ class Texture {
     void getData(u32);
     void getHeight();
     void getWidth();
-    static void crispBlend(int, int);
+    static int crispBlend(int c0, int c1);
     void getManagerId();
     void bind(int);