Create/Update assets for version 1.21.3

assets/minecraft/shaders/core/glint.fsh

@@ -0,0 +1,24 @@
+#version 150
+
+#moj_import <minecraft:fog.glsl>
+
+uniform sampler2D Sampler0;
+
+uniform vec4 ColorModulator;
+uniform float FogStart;
+uniform float FogEnd;
+uniform float GlintAlpha;
+
+in float vertexDistance;
+in vec2 texCoord0;
+
+out vec4 fragColor;
+
+void main() {
+    vec4 color = texture(Sampler0, texCoord0) * ColorModulator;
+    if (color.a < 0.1) {
+        discard;
+    }
+    float fade = linear_fog_fade(vertexDistance, FogStart, FogEnd) * GlintAlpha;
+    fragColor = vec4(color.rgb * fade, color.a);
+}