fix: skybox is not visible behind translucent blocks

res/shaders/lib/sky.glsl

@@ -0,0 +1,14 @@
+#ifndef COMMONS_SKY_
+#define COMMONS_SKY_
+
+#include <constants>
+
+vec3 pick_sky_color(samplerCube cubemap) {
+    vec3 skyLightColor = texture(cubemap, vec3(0.4f, 0.0f, 0.4f)).rgb;
+    skyLightColor *= SKY_LIGHT_TINT;
+    skyLightColor = min(vec3(1.0f), skyLightColor * SKY_LIGHT_MUL);
+    skyLightColor = max(MIN_SKY_LIGHT, skyLightColor);
+    return skyLightColor;
+}
+
+#endif // COMMONS_SKY_