1 files changed, 42 insertions, 0 deletions
diff --git a/src/main/resources/assets/gregtech/shaders/blackhole.frag.glsl b/src/main/resources/assets/gregtech/shaders/blackhole.frag.glsl
new file mode 100644
index 0000000000..4334dde59e
--- /dev/null
+++ b/src/main/resources/assets/gregtech/shaders/blackhole.frag.glsl
@@ -0,0 +1,42 @@
+#version 120
+
+uniform float u_Time;
+uniform float u_Stability;
+uniform sampler2D u_Texture;
+varying vec2 v_TexCoord;
+
+const vec3 STABLE_COLOR = vec3(1,0.85,0.043);
+const vec3 UNSTABLE_COLOR = vec3(.4,0,0);
+
+vec3 toYIQ(vec3 rgb){
+    return mat3( 0.299, 1.0, 0.40462981, 0.587, -0.46081557, -1.0, 0.114, -0.53918443, 0.59537019 ) * rgb;
+}
+
+vec3 toRGB(vec3 yiq){
+    return mat3( 1.0, 1.0, 1.0, 0.5696804, -0.1620848, -0.6590654, 0.3235513, -0.3381869, 0.8901581 ) * yiq;
+}
+
+
+void main() {
+    //Extremely fragile system to deteriminte if isolate parts of the blackhole
+    //Would break with any uv remaping or atlas stiching
+    bool isDisk = (abs(v_TexCoord.y-.5f)>.245);
+    bool isBack = (abs(v_TexCoord.x-.5f)>.245) && isDisk;
+    bool isTinyRing = (v_TexCoord.y > .66) && !isDisk;
+
+    vec2 texCoord = v_TexCoord;
+    if (isDisk || isTinyRing){
+        texCoord.x = mod(texCoord.x+u_Time/30,1);
+    }
+
+    vec4 texture = texture2D(u_Texture, texCoord);
+    if (isDisk || isTinyRing){
+        vec3 targetYIQ = toYIQ(STABLE_COLOR);
+        vec3 originalYIQ = toYIQ(texture.xyz);
+        vec3 yiqColor = vec3(originalYIQ.x,normalize(targetYIQ.yz)*length(originalYIQ.yz));
+        vec3 finalrgb = toRGB(yiqColor);
+        texture = vec4(mix(UNSTABLE_COLOR,finalrgb,pow(u_Stability,.5)),1);
+    }
+
+    gl_FragColor = texture;
+}