1 files changed, 54 insertions, 0 deletions
diff --git a/src/main/resources/assets/notenoughupdates/shaders/capes/screensaver/screensaver.frag b/src/main/resources/assets/notenoughupdates/shaders/capes/screensaver/screensaver.frag
new file mode 100644
index 00000000..8985e717
--- /dev/null
+++ b/src/main/resources/assets/notenoughupdates/shaders/capes/screensaver/screensaver.frag
@@ -0,0 +1,54 @@
+#version 130
+
+uniform sampler2D textureIn;
+uniform int something;
+uniform vec2 dvdPosition;
+
+//Algorithm by sam hocevar
+vec3 rgb2hsv(vec3 c) {
+    vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+    vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
+    vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
+
+    float d = q.x - min(q.w, q.y);
+    float e = 1.0e-10;
+    return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
+}
+
+//Algorithm by hughsk
+vec3 hsv2rgb(vec3 c) {
+    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
+}
+void main() {
+    vec2 diskUv = vec2(1, 634) / 1024;
+    vec2 diskSize = vec2(162, 78) / 1024;
+    float renderScale = 0.5;
+    vec2 renderSize = diskSize * renderScale;
+    vec2 positionTopLeft = dvdPosition / 1024;
+    vec2 positionBottomRight = positionTopLeft + renderSize;
+    vec4 texture = texture2D(textureIn, gl_TexCoord[0].st);
+    // vec4 texture = vec4(1.0, 0.0, 1.0, 1.0);
+    vec2 offset = gl_TexCoord[0].st - positionTopLeft;
+
+    if (0 <= offset.x && offset.x < renderSize.x && 0 <= offset.y && offset.y < renderSize.y) {
+        vec4 diskTexture = texture2D(textureIn, diskUv + offset / renderScale);
+        // vec4 diskTexture = vec4(1.0, 0.0, 0.0, 1.0);
+        if (diskTexture.w > 0.5) {
+            vec3 hehe = rgb2hsv(diskTexture.xyz);
+
+            float otherHue = float(something) / 255.0;
+            if (otherHue > 1){
+                hehe.x = 1;
+            } else if (otherHue < 0){
+                hehe.x = 0;
+            } else {
+                hehe.x = otherHue;
+            }
+
+            texture = vec4(hsv2rgb(hehe), 1.0);
+        }
+    }
+    gl_FragColor = texture;
+}