1 files changed, 129 insertions, 0 deletions
diff --git a/src/main/resources/assets/notenoughupdates/shaders/mcworld_cape.frag b/src/main/resources/assets/notenoughupdates/shaders/mcworld_cape.frag
new file mode 100644
index 00000000..1dc5e1c8
--- /dev/null
+++ b/src/main/resources/assets/notenoughupdates/shaders/mcworld_cape.frag
@@ -0,0 +1,129 @@
+#version 120
+
+varying vec4 passColour;
+varying vec3 passNormal;
+uniform sampler2D textureIn;
+
+uniform int millis;
+
+//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);
+}
+
+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);
+}
+
+void main() {
+    vec4 texture = texture2D(textureIn, gl_TexCoord[0].st);
+
+    float t = gl_TexCoord[0].t;
+    t = clamp(t, 10.0f/1024.0f, 410.0f/1024.0f);
+
+    float start = 56.0f - 44.0f*t/(420.0f/1024.0f);
+    float width = 182.0f + 90.0f*t/(420.0f/1024.0f);
+    float scaleFactor = 1.0f/(width/1024.0f)*112.0f;
+
+    float index = mod(millis/20.0f+t*scaleFactor, 2820.0f);
+    float yIndex = floor(index/1024.0f)*112.0f-(gl_TexCoord[0].s-start/1024.0f)*scaleFactor+532.0f;
+    float xIndex = mod(index, 1024.0f);
+    vec3 world = texture2D(textureIn, vec2(xIndex/1024.0f, yIndex/1024.0f)).xyz;
+
+    float hue = 0.0f;
+    float saturation = 1.0f;
+    float value = 1.0f;
+    if(index < 208) { //sky
+        float blurFactor = clamp((index-158)/100.0f, 0.0f, 0.5f);
+
+        hue = 200.0f;
+        saturation = 1.0f - blurFactor;
+        value = 0.9f - 0.6f*blurFactor;
+    } else if(index < 800) { //underground
+        if(index < 400) {
+            float blurFactor = clamp((258-index)/100.0f, 0.0f, 0.5f);
+
+            hue = 200.0f;
+            saturation = 0.0f + blurFactor;
+            value = 0.3f + 0.6f*blurFactor;
+        } else {
+            float blurFactor = clamp((index-750)/100.0f, 0.0f, 0.5f);
+
+            hue = 350.0f;
+            saturation = 0.0f + 0.5f*blurFactor;
+            value = 0.3f - 0.1f*blurFactor;
+        }
+    } else if(index < 1762) { //nether
+        if(index < 1200) {
+            float blurFactor = clamp((850-index)/100.0f, 0.0f, 0.5f);
+
+            hue = 350.0f;
+            saturation = 0.5f - 0.5f*blurFactor;
+            value = 0.2f + 0.1f*blurFactor;
+        } else {
+            float blurFactor = clamp((index-1712)/100.0f, 0.0f, 0.5f);
+
+            hue = 350.0f;
+            saturation = 0.5f - 0.5f*blurFactor;
+            value = 0.2f + 0.1f*blurFactor;
+        }
+    } else if(index < 2200) { //underground
+        if(index < 1900) {
+            float blurFactor = clamp((1812-index)/100.0f, 0.0f, 0.5f);
+
+            hue = 350.0f;
+            saturation = 0.0f + 0.5f*blurFactor;
+            value = 0.3f - 0.1f*blurFactor;
+        } else {
+            float blurFactor = clamp((index-2150)/100.0f, 0.0f, 0.5f);
+
+            hue = 0.0f;
+            saturation = 0.0f;
+            value = 0.3f - 0.3f*blurFactor;
+        }
+    } else if(index < 2600) { //end
+        if(index < 2400) {
+            float blurFactor = clamp((2250-index)/100.0f, 0.0f, 0.5f);
+
+            hue = 0.0f;
+            saturation = 0.0f;
+            value = 0.0f + 0.3f*blurFactor;
+        } else {
+            float blurFactor = clamp((index-2550)/100.0f, 0.0f, 0.5f);
+
+            hue = 200.0f;
+            saturation = 0.0f + blurFactor;
+            value = 0.0f + 0.9f*blurFactor;
+        }
+    } else { //sky
+        float blurFactor = clamp((2650-index)/100.0f, 0.0f, 0.5f);
+
+        hue = 200.0f;
+        saturation = 1.0f - blurFactor;
+        value = 0.9f - 0.9f*blurFactor;
+    }
+    hue = mod(hue, 360.0f);
+    saturation = max(0.0f, min(1.0f, saturation));
+    value = max(0.0f, min(1.0f, value));
+
+    vec3 hsv = rgb2hsv(texture.rgb);
+    hsv.x = hue/360.0f;
+    hsv.y *= saturation;
+    hsv.z *= value;
+
+    gl_FragColor = vec4(hsv2rgb(hsv)*texture.a + world*(1.0f-texture.a), 1.0f) * 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, gl_FragColor.a);
+}