Backporting CleverRaven#49949

ZhilkinSerg · Aug 12, 2021 · 0d469f9 · 0d469f9
1 parent fd22a13
commit 0d469f9
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/src/lightmap.h b/src/lightmap.h
@@ -38,7 +38,14 @@ static constexpr float LIGHT_TRANSPARENCY_OPEN_AIR = 0.038376418216f;
 // indicates starting (full) visibility (for seen_cache)
 static constexpr float VISIBILITY_FULL = 1.0f;
 
-#define LIGHT_RANGE(b) static_cast<int>( -std::log(LIGHT_AMBIENT_LOW / static_cast<float>(b)) * (1.0 / LIGHT_TRANSPARENCY_OPEN_AIR) )
+constexpr inline int LIGHT_RANGE( float b )
+{
+    if( b <= LIGHT_AMBIENT_LOW ) {
+        return 0;
+    }
+    return static_cast<int>( -std::log( LIGHT_AMBIENT_LOW / b ) * ( 1.0 /
+                             LIGHT_TRANSPARENCY_OPEN_AIR ) );
+}
 
 enum class lit_level : int {
     DARK = 0,