revert to vanilla assets

public/assets/minecraft/shaders/include/light.glsl

@@ -0,0 +1,25 @@
+#version 330
+
+#define MINECRAFT_LIGHT_POWER   (0.6)
+#define MINECRAFT_AMBIENT_LIGHT (0.4)
+
+layout(std140) uniform Lighting {
+    vec3 Light0_Direction;
+    vec3 Light1_Direction;
+};
+
+vec2 minecraft_compute_light(vec3 lightDir0, vec3 lightDir1, vec3 normal) {
+    return vec2(dot(lightDir0, normal), dot(lightDir1, normal));
+}
+
+vec4 minecraft_mix_light_separate(vec2 light, vec4 color) {
+    vec2 lightValue = max(vec2(0.0), light);
+    float lightAccum = min(1.0, (lightValue.x + lightValue.y) * MINECRAFT_LIGHT_POWER + MINECRAFT_AMBIENT_LIGHT);
+    return vec4(color.rgb * lightAccum, color.a);
+}
+
+vec4 minecraft_mix_light(vec3 lightDir0, vec3 lightDir1, vec3 normal, vec4 color) {
+    vec2 light = minecraft_compute_light(lightDir0, lightDir1, normal);
+    return minecraft_mix_light_separate(light, color);
+}
+