Fixing particles

src/SparkEmitter.h

@@ -26,6 +26,7 @@ namespace ZL {
 	private:
 		std::vector<SparkParticle> particles;
 		std::vector<Vector3f> emissionPoints;
+		std::vector<Vector3f> prevEmissionPoints;
 		std::chrono::steady_clock::time_point lastEmissionTime;
 		float emissionRate;
 		bool isActive;
@@ -62,6 +63,7 @@ namespace ZL {
 			float rate = 100.0f);
 
 		void setEmissionPoints(const std::vector<Vector3f>& positions);
+		void resetEmissionPoints(const std::vector<Vector3f>& positions);
 		void setTexture(std::shared_ptr<Texture> tex);
 		void setEmissionRate(float rate) { emissionRate = rate; }
 		void setShaderProgramName(const std::string& name) { shaderProgramName = name; }
@@ -73,7 +75,10 @@ namespace ZL {
 		bool loadFromJsonFile(const std::string& path, Renderer& renderer, const std::string& zipFile = "");
 
 		void update(float deltaTimeMs);
-		void emit();
+		void emit(float ageMs = 0.0f, float lerpT = 0.0f);
+
+		// Вызывать ДО draw() в начале кадра: готовит данные и загружает в VBO.
+		void prepareForDraw(bool withRotation = true);
 
 		void draw(Renderer& renderer, float zoom, int screenWidth, int screenHeight);
 		void draw(Renderer& renderer, float zoom, int screenWidth, int screenHeight, bool withRotation);