clean up shaders, change xp orb colour

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

@@ -9,13 +9,16 @@ uniform vec4 ColorModulator;
 uniform float FogStart;
 uniform float FogEnd;
 uniform vec4 FogColor;
-uniform vec4 Pink;
 
 in vec4 vertexColor;
 in vec2 texCoord0;
 
 out vec4 fragColor;
 
+vec4 pink = vec4(0.957, 0.722, 0.859, 1);
+
+// This file slightly alters the colour of the beacon beam
+
 void main() {
     vec4 color = texture(Sampler0, texCoord0);
     color *= vertexColor * ColorModulator;
@@ -34,6 +37,6 @@ void main() {
     nuts /= 3;
     nuts += 0.25;
 
-    color.rgb = mix(color.rgb, Pink.rgb, nuts);
+    color.rgb = mix(color.rgb, pink.rgb, nuts);
     fragColor = linear_fog(color, fragmentDistance, FogStart, FogEnd, FogColor);
 }

pack/assets/minecraft/shaders/core/rendertype_beacon_beam.json

@@ -1,26 +0,0 @@
-{
-    "blend": {
-        "func": "add",
-        "srcrgb": "srcalpha",
-        "dstrgb": "1-srcalpha"
-    },
-    "vertex": "rendertype_beacon_beam",
-    "fragment": "rendertype_beacon_beam",
-    "attributes": [
-        "Position",
-        "Color",
-        "UV0"
-    ],
-    "samplers": [
-        { "name": "Sampler0" }
-    ],
-    "uniforms": [
-        { "name": "ModelViewMat", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
-        { "name": "ProjMat", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
-        { "name": "ColorModulator", "type": "float", "count": 4, "values": [ 1.0, 1.0, 1.0, 1.0 ] },
-        { "name": "FogStart", "type": "float", "count": 1, "values": [ 0.0 ] },
-        { "name": "FogEnd", "type": "float", "count": 1, "values": [ 1.0 ] },
-        { "name": "FogColor", "type": "float", "count": 4, "values": [ 0.0, 0.0, 0.0, 0.0 ] },
-        { "name": "Pink", "type": "float", "count": 4, "values": [ 0.957, 0.722, 0.859, 1 ] }
-    ]
-}

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

@@ -0,0 +1,50 @@
+#version 150
+
+#moj_import <fog.glsl>
+#moj_import <hue_shift.glsl>
+
+uniform sampler2D Sampler0;
+
+uniform vec4 ColorModulator;
+uniform float FogStart;
+uniform float FogEnd;
+uniform vec4 FogColor;
+
+in float vertexDistance;
+in vec4 vertexColor;
+in vec2 texCoord0;
+in vec2 texCoord1;
+in vec4 normal;
+in vec4 tintColour;
+
+out vec4 fragColor;
+
+/**
+ * This changes the colour of XP orbs.
+ *
+ * I stole some of the code from this funky individual (planet minecraft, point and laugh):
+ * https://www.planetminecraft.com/texture-pack/rainbow-xp-vanilla/
+ *
+ * Simply hue shifting the XP colours worked sufficiently well for me, but if I wanted
+ * better control over the resulting colours I'd have to put more effort into this.
+ * The resulting colour pulses between purple and dark pink.
+ */
+
+void main() {
+    vec4 color = texture(Sampler0, texCoord0) * vertexColor * ColorModulator;
+    if (color.a < 0.1) {
+        discard;
+    }
+
+    // detect xp orbs using their tint colour
+    vec4 col255 = tintColour * 255;
+    if(
+        0 <= col255.r && col255.r <= 255 &&
+        253 <= col255.g && col255.g <= 255 &&
+        0 <= col255.b && col255.b <= 51
+    ) {
+        color = vec4(hueShift(color.rgb, 160), color.a);
+    }
+
+    fragColor = linear_fog(color, vertexDistance, FogStart, FogEnd, FogColor);
+}

pack/assets/minecraft/shaders/core/rendertype_item_entity_translucent_cull.vsh

@@ -0,0 +1,43 @@
+#version 150
+
+#moj_import <light.glsl>
+#moj_import <fog.glsl>
+
+in vec3 Position;
+in vec4 Color;
+in vec2 UV0;
+in vec2 UV1;
+in ivec2 UV2;
+in vec3 Normal;
+
+uniform sampler2D Sampler2;
+
+uniform mat4 ModelViewMat;
+uniform mat4 ProjMat;
+uniform mat3 IViewRotMat;
+uniform int FogShape;
+
+uniform vec3 Light0_Direction;
+uniform vec3 Light1_Direction;
+
+out float vertexDistance;
+out vec4 vertexColor;
+out vec2 texCoord0;
+out vec2 texCoord1;
+out vec2 texCoord2;
+out vec4 normal;
+out vec4 tintColour;
+
+// This file is modified to pass `tintColour` as output.
+
+void main() {
+    gl_Position = ProjMat * ModelViewMat * vec4(Position, 1.0);
+
+    vertexDistance = fog_distance(ModelViewMat, IViewRotMat * Position, FogShape);
+    vertexColor = minecraft_mix_light(Light0_Direction, Light1_Direction, Normal, Color) * texelFetch(Sampler2, UV2 / 16, 0);
+    tintColour = Color;
+    texCoord0 = UV0;
+    texCoord1 = UV1;
+    texCoord2 = UV2;
+    normal = ProjMat * ModelViewMat * vec4(Normal, 0.0);
+}

pack/assets/minecraft/shaders/include/hue_shift.glsl

@@ -0,0 +1,28 @@
+#version 150
+
+// https://gist.github.com/mairod/a75e7b44f68110e1576d77419d608786
+
+vec3 hueShift( vec3 color, float hueAdjust ) {
+    const vec3  kRGBToYPrime = vec3 (0.299, 0.587, 0.114);
+    const vec3  kRGBToI      = vec3 (0.596, -0.275, -0.321);
+    const vec3  kRGBToQ      = vec3 (0.212, -0.523, 0.311);
+
+    const vec3  kYIQToR     = vec3 (1.0, 0.956, 0.621);
+    const vec3  kYIQToG     = vec3 (1.0, -0.272, -0.647);
+    const vec3  kYIQToB     = vec3 (1.0, -1.107, 1.704);
+
+    float   YPrime  = dot (color, kRGBToYPrime);
+    float   I       = dot (color, kRGBToI);
+    float   Q       = dot (color, kRGBToQ);
+    float   hue     = atan (Q, I);
+    float   chroma  = sqrt (I * I + Q * Q);
+
+    hue += hueAdjust;
+
+    Q = chroma * sin (hue);
+    I = chroma * cos (hue);
+
+    vec3 yIQ = vec3 (YPrime, I, Q);
+
+    return vec3( dot (yIQ, kYIQToR), dot (yIQ, kYIQToG), dot (yIQ, kYIQToB) );
+}