Don't draw offscreen particles

#1851 #1301

src/object/cloud_particle_system.cpp

@@ -234,10 +234,16 @@ void CloudParticleSystem::draw(DrawingContext& context)
   if (!enabled)
     return;
 
+  const auto& region = Sector::current()->get_active_region();
+
   context.push_transform();
 
   std::unordered_map<SurfacePtr, SurfaceBatch> batches;
   for (const auto& particle : particles) {
+
+    if(!region.contains(particle->pos))
+      continue;
+
     if (particle->alpha != 1.f) {
       const auto& batch_it = batches.emplace(
           particle->texture->clone(),

src/object/particlesystem.cpp

@@ -19,6 +19,7 @@
 #include <math.h>
 
 #include "supertux/globals.hpp"
+#include "supertux/sector.hpp"
 #include "util/reader.hpp"
 #include "util/reader_mapping.hpp"
 #include "util/writer.hpp"
@@ -81,6 +82,7 @@ ParticleSystem::draw(DrawingContext& context)
 
   float scrollx = context.get_translation().x;
   float scrolly = context.get_translation().y;
+  const auto& region = Sector::current()->get_active_region();
 
   context.push_transform();
   context.set_translation(Vector(max_particle_size,max_particle_size));
@@ -99,6 +101,9 @@ ParticleSystem::draw(DrawingContext& context)
     pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
     if (pos.y < 0) pos.y += virtual_height;
 
+    if(!region.contains(particle->pos))
+      continue;
+
     //if(pos.x > virtual_width) pos.x -= virtual_width;
     //if(pos.y > virtual_height) pos.y -= virtual_height;
 

src/object/particlesystem_interactive.cpp

@@ -62,9 +62,12 @@ ParticleSystem_Interactive::draw(DrawingContext& context)
     return;
 
   context.push_transform();
-
+  const auto& region = Sector::current()->get_active_region();
   std::unordered_map<SurfacePtr, SurfaceBatch> batches;
   for (const auto& particle : particles) {
+    if(!region.contains(particle->pos))
+      continue;
+
     auto it = batches.find(particle->texture);
     if (it == batches.end()) {
       const auto& batch_it = batches.emplace(particle->texture,