1 files changed, 33 insertions, 0 deletions
diff --git a/src/main/resources/assets/notenoughupdates/shaders/negative.frag b/src/main/resources/assets/notenoughupdates/shaders/negative.frag
new file mode 100644
index 00000000..a601bd0c
--- /dev/null
+++ b/src/main/resources/assets/notenoughupdates/shaders/negative.frag
@@ -0,0 +1,33 @@
+#version 130
+
+varying vec4 passColour;
+varying vec3 passNormal;
+uniform sampler2D textureIn;
+varying vec4 passPosition;
+uniform vec2 screensize;
+
+int a(float f) {
+	return int(round(f*1999));
+}
+
+void main() {
+    vec2 viewportCoord = gl_FragCoord.xy/screensize.xy;
+    vec4 texture = texture2D(textureIn, viewportCoord);
+
+    int offsetFactor = a(viewportCoord.x)^a(viewportCoord.y);
+    float dist = 1+mod(offsetFactor/4, 2);
+    float xOffset = dist*mod(offsetFactor-1, 2);
+    float yOffset = dist*mod(offsetFactor-2, 2);
+
+    texture = texture2D(textureIn, vec2(viewportCoord.x+xOffset/screensize.x, viewportCoord.y+yOffset/screensize.y));
+    texture = vec4(texture.rgb*texture.a, 1);
+    texture.rgb = 1 - texture.rgb;
+
+    gl_FragColor = texture * passColour;
+
+    vec3 fakeSunNormal = normalize(vec3(0.2f,1.0f,-0.2f));
+    vec3 normNormal = normalize(passNormal);
+    float shading = max(0.6f, dot(fakeSunNormal, normNormal));
+
+    gl_FragColor = vec4(gl_FragColor.rgb*shading, 1);
+}
+\ No newline at end of file