add particles stats to debug panel

src/frontend/debug_panel.cpp

@@ -9,6 +9,7 @@
 #include "graphics/ui/elements/TrackBar.hpp"
 #include "graphics/ui/elements/InputBindBox.hpp"
 #include "graphics/render/WorldRenderer.hpp"
+#include "graphics/render/ParticlesRenderer.hpp"
 #include "logic/scripting/scripting.hpp"
 #include "objects/Player.hpp"
 #include "objects/Entities.hpp"
@@ -83,6 +84,12 @@ std::shared_ptr<UINode> create_debug_panel(
         bool culling = settings.graphics.frustumCulling.get();
         return L"frustum-culling: "+std::wstring(culling ? L"on" : L"off");
     }));
+    panel->add(create_label([=]() {
+        return L"particles: " +
+               std::to_wstring(ParticlesRenderer::visibleParticles) +
+               L" emitters: " +
+               std::to_wstring(ParticlesRenderer::aliveEmitters);
+    }));
     panel->add(create_label([=]() {
         return L"chunks: "+std::to_wstring(level->chunks->getChunksCount())+
                L" visible: "+std::to_wstring(level->chunks->visible);

src/graphics/render/ParticlesRenderer.cpp

@@ -1,17 +1,22 @@
 #include "ParticlesRenderer.hpp"
 
 #include "assets/Assets.hpp"
+#include "assets/assets_util.hpp"
 #include "graphics/core/Shader.hpp"
 #include "graphics/core/Texture.hpp"
 #include "graphics/render/MainBatch.hpp"
 #include "window/Camera.hpp"
 
+size_t ParticlesRenderer::visibleParticles = 0;
+size_t ParticlesRenderer::aliveEmitters = 0;
+
 ParticlesRenderer::ParticlesRenderer(const Assets& assets)
     : batch(std::make_unique<MainBatch>(1024)) {
 
+    auto region = util::get_texture_region(assets, "blocks:grass_side", "");
     Emitter emitter(glm::vec3(0, 100, 0), Particle {
-        glm::vec3(), glm::vec3(), 5.0f, UVRegion(0,0,1,1)
+        glm::vec3(), glm::vec3(), 5.0f, region.region
-    }, assets.get<Texture>("gui/error"), 0.003f, -1);
+    },region.texture, 0.001f, -1);
     emitters.push_back(std::move(emitter));
 }
 
@@ -24,9 +29,14 @@ void ParticlesRenderer::render(
     const auto& up = camera.up;
 
     batch->begin();
+    
+    aliveEmitters = emitters.size();
+    visibleParticles = 0;
     for (auto& [texture, vec] : particles) {
         batch->setTexture(texture);
 
+        visibleParticles += vec.size();
+
         auto iter = vec.begin();
         while (iter != vec.end()) {
             auto& particle = *iter;

src/graphics/render/ParticlesRenderer.hpp

@@ -19,4 +19,7 @@ public:
     ~ParticlesRenderer();
 
     void render(const Assets& assets, const Camera& camera, float delta);
+
+    static size_t visibleParticles;
+    static size_t aliveEmitters;
 };

src/graphics/render/WorldRenderer.cpp

@@ -63,7 +63,7 @@ WorldRenderer::WorldRenderer(
           &engine->getSettings()
       )),
       particles(std::make_unique<ParticlesRenderer>(*engine->getAssets())) {
-        
+
     renderer = std::make_unique<ChunksRenderer>(
         level, frontend->getContentGfxCache(), &engine->getSettings()
     );
@@ -216,7 +216,7 @@ void WorldRenderer::renderLevel(
         delta,
         pause
     );
-    particles->render(*assets, camera, delta);
+    particles->render(*assets, camera, delta * !pause);
     modelBatch->render();
 
     auto shader = assets->get<Shader>("main");