feat(firework): halo neon per partícula amb color de glow propi (explosió enemic: línia blanca + halo daurat)

source/core/rendering/line_renderer.cpp

@@ -4,6 +4,7 @@
 #include "core/rendering/line_renderer.hpp"
 
 #include "core/defaults.hpp"
+#include "core/defaults/effects.hpp"
 
 namespace Rendering {
 
@@ -46,6 +47,27 @@ namespace Rendering {
         renderer->pushLine(FX1, FY1, FX2, FY2, W, R, G, B, alpha);
     }
 
+    void lineaGlow(Renderer* renderer,
+        int x1,
+        int y1,
+        int x2,
+        int y2,
+        float brightness,
+        float thickness,
+        SDL_Color color,
+        SDL_Color glow_color) {
+        // Color dels passes de halo: si glow_color té alpha>0, l'usem;
+        // altrament fem servir el color de la línia.
+        const SDL_Color HALO_COLOR = (glow_color.a > 0) ? glow_color : color;
+
+        for (const auto& pass : Defaults::FX::Glow::Line::PASSES) {
+            const bool IS_CORE = pass.thickness < 0.0F;
+            const float PASS_T = IS_CORE ? thickness : pass.thickness;
+            const SDL_Color PASS_C = IS_CORE ? color : HALO_COLOR;
+            linea(renderer, x1, y1, x2, y2, brightness, PASS_T, PASS_C, pass.alpha);
+        }
+    }
+
     void setLineColor(SDL_Color color) { g_current_line_color = color; }
 
     auto getLineColor() -> SDL_Color { return g_current_line_color; }