Added sparks

src/SparkEmitter.h

@@ -51,9 +51,18 @@ namespace ZL {
 		std::string shaderProgramName;
 
 		bool configured;
-		void prepareDrawData(bool withRotation);
+		// Rebuilds the CPU-side quad/UV arrays. If cameraViewMatrix is identity,
+		// particles are rendered as axis-aligned quads in world XY and sorted by
+		// world Z (legacy behavior). Otherwise quads are billboarded toward the
+		// camera using its world-space right/up axes, and particles are sorted
+		// back-to-front in eye space for correct alpha blending.
+		void prepareDrawData(const Eigen::Matrix4f& cameraViewMatrix);
 		bool useWorldSpace;
 
+		// When non-zero, velocities spray in a cone around this direction
+		// instead of the default planar XY + Z spread used by JSON emitters.
+		Vector3f emissionDirection = Vector3f{ 0.f, 0.f, 0.f };
+
 	public:
 		SparkEmitter();
 		SparkEmitter(const SparkEmitter& copyFrom);
@@ -74,11 +83,24 @@ namespace ZL {
 		void setUseWorldSpace(bool use) { useWorldSpace = use; }
 		bool loadFromJsonFile(const std::string& path, Renderer& renderer, const std::string& zipFile = "");
 
+		// Programmatic configuration (alternative to loadFromJsonFile).
+		// Ranges follow the same semantics as the JSON fields.
+		void setSpeedRange(float minVal, float maxVal) { speedRange.min = minVal; speedRange.max = maxVal; }
+		void setZSpeedRange(float minVal, float maxVal) { zSpeedRange.min = minVal; zSpeedRange.max = maxVal; }
+		void setScaleRange(float minVal, float maxVal) { scaleRange.min = minVal; scaleRange.max = maxVal; }
+		void setLifeTimeRange(float minVal, float maxVal) { lifeTimeRange.min = minVal; lifeTimeRange.max = maxVal; }
+		void setEmissionDirection(const Vector3f& dir) { emissionDirection = dir; }
+		void markConfigured() { configured = true; }
+		bool isConfigured() const { return configured; }
+
 		void update(float deltaTimeMs);
 		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);
+		// Pass the current camera view matrix (world → eye) to billboard sparks
+		// toward the camera and sort them back-to-front. Identity (default)
+		// keeps the legacy non-billboarded behavior.
+		void prepareForDraw(const Eigen::Matrix4f& cameraViewMatrix = Eigen::Matrix4f::Identity());
 
 		void draw(Renderer& renderer, float zoom, int screenWidth, int screenHeight);
 		void draw(Renderer& renderer, float zoom, int screenWidth, int screenHeight, bool withRotation);