pink-ify end portal shader

pack/assets/minecraft/shaders/core/rendertype_end_portal.fsh

@@ -0,0 +1,74 @@
+#version 150
+
+#moj_import <matrix.glsl>
+
+uniform sampler2D Sampler0;
+uniform sampler2D Sampler1;
+
+uniform float GameTime;
+uniform int EndPortalLayers;
+
+in vec4 texProj0;
+
+// removed the `const` keyword here because we're going to modify these values in main()
+vec3[] COLORS = vec3[](
+    vec3(0.022087, 0.098399, 0.110818), // weird foreground layer?
+    vec3(0.011892, 0.095924, 0.089485), // stars in background
+    vec3(0.027636, 0.101689, 0.100326), // also stars
+    vec3(0.046564, 0.109883, 0.114838), // more stars
+    vec3(0.064901, 0.117696, 0.097189), // the stars are getting bigger
+    vec3(0.063761, 0.086895, 0.123646), // take a guess
+    vec3(0.084817, 0.111994, 0.166380), // bigger stars
+    vec3(0.097489, 0.154120, 0.091064), // would almost consider them foreground objects now
+    vec3(0.106152, 0.131144, 0.195191), // .
+    vec3(0.097721, 0.110188, 0.187229), // .
+    vec3(0.133516, 0.138278, 0.148582), // !
+    vec3(0.070006, 0.243332, 0.235792), // !!
+    vec3(0.196766, 0.142899, 0.214696), // !!!
+    vec3(0.047281, 0.315338, 0.321970), // the turquoise thingies going from left to right
+    vec3(0.204675, 0.390010, 0.302066), // green things going from top to bottom
+    vec3(0.080955, 0.314821, 0.661491)  // blue things going from right to left
+);
+
+const vec3 PINK = vec3(0.898, 0.541, 0.749);
+
+const mat4 SCALE_TRANSLATE = mat4(
+    0.5, 0.0, 0.0, 0.25,
+    0.0, 0.5, 0.0, 0.25,
+    0.0, 0.0, 1.0, 0.0,
+    0.0, 0.0, 0.0, 1.0
+);
+
+mat4 end_portal_layer(float layer) {
+    mat4 translate = mat4(
+        1.0, 0.0, 0.0, 17.0 / layer,
+        0.0, 1.0, 0.0, (2.0 + layer / 1.5) * (GameTime * 1.5),
+        0.0, 0.0, 1.0, 0.0,
+        0.0, 0.0, 0.0, 1.0
+    );
+
+    mat2 rotate = mat2_rotate_z(radians((layer * layer * 4321.0 + layer * 9.0) * 2.0));
+
+    mat2 scale = mat2((4.5 - layer / 4.0) * 2.0);
+
+    return mat4(scale * rotate) * translate * SCALE_TRANSLATE;
+}
+
+out vec4 fragColor;
+
+void main() {
+    // start at 1 because we don't want to change the foreground noise here
+    for (int i = 1; i < 16; i++) {
+        float intensity = float(i) / 16.0;
+        COLORS[i] = mix(COLORS[i], PINK, intensity * 0.7);
+    }
+
+    // slightly shift foreground to pink as well :3
+    COLORS[0] = mix(COLORS[0], PINK, 0.15);
+
+    vec3 color = textureProj(Sampler0, texProj0).rgb * COLORS[0];
+    for (int i = 0; i < EndPortalLayers; i++) {
+        color += textureProj(Sampler1, texProj0 * end_portal_layer(float(i + 1))).rgb * COLORS[i];
+    }
+    fragColor = vec4(color, 1.0);
+}