revert to vanilla assets

public/assets/minecraft/shaders/post/invert.fsh

@@ -0,0 +1,25 @@
+#version 330
+
+uniform sampler2D InSampler;
+
+in vec2 texCoord;
+
+layout(std140) uniform SamplerInfo {
+    vec2 OutSize;
+    vec2 InSize;
+};
+
+layout(std140) uniform InvertConfig {
+    float InverseAmount;
+};
+
+out vec4 fragColor;
+
+void main(){
+    vec2 sizeRatio = OutSize / InSize;
+
+    vec4 diffuseColor = texture(InSampler, texCoord);
+    vec4 invertColor = 1.0 - diffuseColor;
+    vec4 outColor = mix(diffuseColor, invertColor, InverseAmount);
+    fragColor = vec4(outColor.rgb, 1.0);
+}