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+/*******************************************************************************************
+*
+*   rcamera - Basic camera system with support for multiple camera modes
+*
+*   CONFIGURATION:
+*       #define RCAMERA_IMPLEMENTATION
+*           Generates the implementation of the library into the included file.
+*           If not defined, the library is in header only mode and can be included in other headers
+*           or source files without problems. But only ONE file should hold the implementation.
+*
+*       #define RCAMERA_STANDALONE
+*           If defined, the library can be used as standalone as a camera system but some
+*           functions must be redefined to manage inputs accordingly.
+*
+*   CONTRIBUTORS:
+*       Ramon Santamaria:   Supervision, review, update and maintenance
+*       Christoph Wagner:   Complete redesign, using raymath (2022)
+*       Marc Palau:         Initial implementation (2014)
+*
+*
+*   LICENSE: zlib/libpng
+*
+*   Copyright (c) 2022-2024 Christoph Wagner (@Crydsch) & Ramon Santamaria (@raysan5)
+*
+*   This software is provided "as-is", without any express or implied warranty. In no event
+*   will the authors be held liable for any damages arising from the use of this software.
+*
+*   Permission is granted to anyone to use this software for any purpose, including commercial
+*   applications, and to alter it and redistribute it freely, subject to the following restrictions:
+*
+*     1. The origin of this software must not be misrepresented; you must not claim that you
+*     wrote the original software. If you use this software in a product, an acknowledgment
+*     in the product documentation would be appreciated but is not required.
+*
+*     2. Altered source versions must be plainly marked as such, and must not be misrepresented
+*     as being the original software.
+*
+*     3. This notice may not be removed or altered from any source distribution.
+*
+**********************************************************************************************/
+
+#ifndef RCAMERA_H
+#define RCAMERA_H
+
+//----------------------------------------------------------------------------------
+// Defines and Macros
+//----------------------------------------------------------------------------------
+// Function specifiers definition
+
+// Function specifiers in case library is build/used as a shared library (Windows)
+// NOTE: Microsoft specifiers to tell compiler that symbols are imported/exported from a .dll
+#if defined(_WIN32)
+#if defined(BUILD_LIBTYPE_SHARED)
+#if defined(__TINYC__)
+#define __declspec(x) __attribute__((x))
+#endif
+#define RLAPI __declspec(dllexport)     // We are building the library as a Win32 shared library (.dll)
+#elif defined(USE_LIBTYPE_SHARED)
+#define RLAPI __declspec(dllimport)     // We are using the library as a Win32 shared library (.dll)
+#endif
+#endif
+
+#ifndef RLAPI
+    #define RLAPI       // Functions defined as 'extern' by default (implicit specifiers)
+#endif
+
+#if defined(RCAMERA_STANDALONE)
+    #define CAMERA_CULL_DISTANCE_NEAR      0.01
+    #define CAMERA_CULL_DISTANCE_FAR    1000.0
+#else
+    #define CAMERA_CULL_DISTANCE_NEAR   RL_CULL_DISTANCE_NEAR
+    #define CAMERA_CULL_DISTANCE_FAR    RL_CULL_DISTANCE_FAR
+#endif
+
+//----------------------------------------------------------------------------------
+// Types and Structures Definition
+// NOTE: Below types are required for standalone usage
+//----------------------------------------------------------------------------------
+#if defined(RCAMERA_STANDALONE)
+    // Vector2, 2 components
+    typedef struct Vector2 {
+        float x;                // Vector x component
+        float y;                // Vector y component
+    } Vector2;
+
+    // Vector3, 3 components
+    typedef struct Vector3 {
+        float x;                // Vector x component
+        float y;                // Vector y component
+        float z;                // Vector z component
+    } Vector3;
+
+    // Matrix, 4x4 components, column major, OpenGL style, right-handed
+    typedef struct Matrix {
+        float m0, m4, m8, m12;  // Matrix first row (4 components)
+        float m1, m5, m9, m13;  // Matrix second row (4 components)
+        float m2, m6, m10, m14; // Matrix third row (4 components)
+        float m3, m7, m11, m15; // Matrix fourth row (4 components)
+    } Matrix;
+
+    // Camera type, defines a camera position/orientation in 3d space
+    typedef struct Camera3D {
+        Vector3 position;       // Camera position
+        Vector3 target;         // Camera target it looks-at
+        Vector3 up;             // Camera up vector (rotation over its axis)
+        float fovy;             // Camera field-of-view apperture in Y (degrees) in perspective, used as near plane width in orthographic
+        int projection;         // Camera projection type: CAMERA_PERSPECTIVE or CAMERA_ORTHOGRAPHIC
+    } Camera3D;
+
+    typedef Camera3D Camera;    // Camera type fallback, defaults to Camera3D
+
+    // Camera projection
+    typedef enum {
+        CAMERA_PERSPECTIVE = 0, // Perspective projection
+        CAMERA_ORTHOGRAPHIC     // Orthographic projection
+    } CameraProjection;
+
+    // Camera system modes
+    typedef enum {
+        CAMERA_CUSTOM = 0,      // Camera custom, controlled by user (UpdateCamera() does nothing)
+        CAMERA_FREE,            // Camera free mode
+        CAMERA_ORBITAL,         // Camera orbital, around target, zoom supported
+        CAMERA_FIRST_PERSON,    // Camera first person
+        CAMERA_THIRD_PERSON     // Camera third person
+    } CameraMode;
+#endif
+
+//----------------------------------------------------------------------------------
+// Global Variables Definition
+//----------------------------------------------------------------------------------
+//...
+
+//----------------------------------------------------------------------------------
+// Module Functions Declaration
+//----------------------------------------------------------------------------------
+
+#if defined(__cplusplus)
+extern "C" {            // Prevents name mangling of functions
+#endif
+
+RLAPI Vector3 GetCameraForward(Camera *camera);
+RLAPI Vector3 GetCameraUp(Camera *camera);
+RLAPI Vector3 GetCameraRight(Camera *camera);
+
+// Camera movement
+RLAPI void CameraMoveForward(Camera *camera, float distance, bool moveInWorldPlane);
+RLAPI void CameraMoveUp(Camera *camera, float distance);
+RLAPI void CameraMoveRight(Camera *camera, float distance, bool moveInWorldPlane);
+RLAPI void CameraMoveToTarget(Camera *camera, float delta);
+
+// Camera rotation
+RLAPI void CameraYaw(Camera *camera, float angle, bool rotateAroundTarget);
+RLAPI void CameraPitch(Camera *camera, float angle, bool lockView, bool rotateAroundTarget, bool rotateUp);
+RLAPI void CameraRoll(Camera *camera, float angle);
+
+RLAPI Matrix GetCameraViewMatrix(Camera *camera);
+RLAPI Matrix GetCameraProjectionMatrix(Camera* camera, float aspect);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif // RCAMERA_H
+
+/***********************************************************************************
+*
+*   CAMERA IMPLEMENTATION
+*
+************************************************************************************/
+
+#if defined(RCAMERA_IMPLEMENTATION)
+
+#include "raymath.h"        // Required for vector maths:
+                            // Vector3Add()
+                            // Vector3Subtract()
+                            // Vector3Scale()
+                            // Vector3Normalize()
+                            // Vector3Distance()
+                            // Vector3CrossProduct()
+                            // Vector3RotateByAxisAngle()
+                            // Vector3Angle()
+                            // Vector3Negate()
+                            // MatrixLookAt()
+                            // MatrixPerspective()
+                            // MatrixOrtho()
+                            // MatrixIdentity()
+
+// raylib required functionality:
+                            // GetMouseDelta()
+                            // GetMouseWheelMove()
+                            // IsKeyDown()
+                            // IsKeyPressed()
+                            // GetFrameTime()
+
+//----------------------------------------------------------------------------------
+// Defines and Macros
+//----------------------------------------------------------------------------------
+#define CAMERA_MOVE_SPEED                               5.4f       // Units per second
+#define CAMERA_ROTATION_SPEED                           0.03f
+#define CAMERA_PAN_SPEED                                0.2f
+
+// Camera mouse movement sensitivity
+#define CAMERA_MOUSE_MOVE_SENSITIVITY                   0.003f
+
+// Camera orbital speed in CAMERA_ORBITAL mode
+#define CAMERA_ORBITAL_SPEED                            0.5f       // Radians per second
+
+//----------------------------------------------------------------------------------
+// Types and Structures Definition
+//----------------------------------------------------------------------------------
+//...
+
+//----------------------------------------------------------------------------------
+// Global Variables Definition
+//----------------------------------------------------------------------------------
+//...
+
+//----------------------------------------------------------------------------------
+// Module specific Functions Declaration
+//----------------------------------------------------------------------------------
+//...
+
+//----------------------------------------------------------------------------------
+// Module Functions Definition
+//----------------------------------------------------------------------------------
+// Returns the cameras forward vector (normalized)
+Vector3 GetCameraForward(Camera *camera)
+{
+    return Vector3Normalize(Vector3Subtract(camera->target, camera->position));
+}
+
+// Returns the cameras up vector (normalized)
+// Note: The up vector might not be perpendicular to the forward vector
+Vector3 GetCameraUp(Camera *camera)
+{
+    return Vector3Normalize(camera->up);
+}
+
+// Returns the cameras right vector (normalized)
+Vector3 GetCameraRight(Camera *camera)
+{
+    Vector3 forward = GetCameraForward(camera);
+    Vector3 up = GetCameraUp(camera);
+
+    return Vector3Normalize(Vector3CrossProduct(forward, up));
+}
+
+// Moves the camera in its forward direction
+void CameraMoveForward(Camera *camera, float distance, bool moveInWorldPlane)
+{
+    Vector3 forward = GetCameraForward(camera);
+
+    if (moveInWorldPlane)
+    {
+        // Project vector onto world plane
+        forward.y = 0;
+        forward = Vector3Normalize(forward);
+    }
+
+    // Scale by distance
+    forward = Vector3Scale(forward, distance);
+
+    // Move position and target
+    camera->position = Vector3Add(camera->position, forward);
+    camera->target = Vector3Add(camera->target, forward);
+}
+
+// Moves the camera in its up direction
+void CameraMoveUp(Camera *camera, float distance)
+{
+    Vector3 up = GetCameraUp(camera);
+
+    // Scale by distance
+    up = Vector3Scale(up, distance);
+
+    // Move position and target
+    camera->position = Vector3Add(camera->position, up);
+    camera->target = Vector3Add(camera->target, up);
+}
+
+// Moves the camera target in its current right direction
+void CameraMoveRight(Camera *camera, float distance, bool moveInWorldPlane)
+{
+    Vector3 right = GetCameraRight(camera);
+
+    if (moveInWorldPlane)
+    {
+        // Project vector onto world plane
+        right.y = 0;
+        right = Vector3Normalize(right);
+    }
+
+    // Scale by distance
+    right = Vector3Scale(right, distance);
+
+    // Move position and target
+    camera->position = Vector3Add(camera->position, right);
+    camera->target = Vector3Add(camera->target, right);
+}
+
+// Moves the camera position closer/farther to/from the camera target
+void CameraMoveToTarget(Camera *camera, float delta)
+{
+    float distance = Vector3Distance(camera->position, camera->target);
+
+    // Apply delta
+    distance += delta;
+
+    // Distance must be greater than 0
+    if (distance <= 0) distance = 0.001f;
+
+    // Set new distance by moving the position along the forward vector
+    Vector3 forward = GetCameraForward(camera);
+    camera->position = Vector3Add(camera->target, Vector3Scale(forward, -distance));
+}
+
+// Rotates the camera around its up vector
+// Yaw is "looking left and right"
+// If rotateAroundTarget is false, the camera rotates around its position
+// Note: angle must be provided in radians
+void CameraYaw(Camera *camera, float angle, bool rotateAroundTarget)
+{
+    // Rotation axis
+    Vector3 up = GetCameraUp(camera);
+
+    // View vector
+    Vector3 targetPosition = Vector3Subtract(camera->target, camera->position);
+
+    // Rotate view vector around up axis
+    targetPosition = Vector3RotateByAxisAngle(targetPosition, up, angle);
+
+    if (rotateAroundTarget)
+    {
+        // Move position relative to target
+        camera->position = Vector3Subtract(camera->target, targetPosition);
+    }
+    else // rotate around camera.position
+    {
+        // Move target relative to position
+        camera->target = Vector3Add(camera->position, targetPosition);
+    }
+}
+
+// Rotates the camera around its right vector, pitch is "looking up and down"
+//  - lockView prevents camera overrotation (aka "somersaults")
+//  - rotateAroundTarget defines if rotation is around target or around its position
+//  - rotateUp rotates the up direction as well (typically only usefull in CAMERA_FREE)
+// NOTE: angle must be provided in radians
+void CameraPitch(Camera *camera, float angle, bool lockView, bool rotateAroundTarget, bool rotateUp)
+{
+    // Up direction
+    Vector3 up = GetCameraUp(camera);
+
+    // View vector
+    Vector3 targetPosition = Vector3Subtract(camera->target, camera->position);
+
+    if (lockView)
+    {
+        // In these camera modes we clamp the Pitch angle
+        // to allow only viewing straight up or down.
+
+        // Clamp view up
+        float maxAngleUp = Vector3Angle(up, targetPosition);
+        maxAngleUp -= 0.001f; // avoid numerical errors
+        if (angle > maxAngleUp) angle = maxAngleUp;
+
+        // Clamp view down
+        float maxAngleDown = Vector3Angle(Vector3Negate(up), targetPosition);
+        maxAngleDown *= -1.0f; // downwards angle is negative
+        maxAngleDown += 0.001f; // avoid numerical errors
+        if (angle < maxAngleDown) angle = maxAngleDown;
+    }
+
+    // Rotation axis
+    Vector3 right = GetCameraRight(camera);
+
+    // Rotate view vector around right axis
+    targetPosition = Vector3RotateByAxisAngle(targetPosition, right, angle);
+
+    if (rotateAroundTarget)
+    {
+        // Move position relative to target
+        camera->position = Vector3Subtract(camera->target, targetPosition);
+    }
+    else // rotate around camera.position
+    {
+        // Move target relative to position
+        camera->target = Vector3Add(camera->position, targetPosition);
+    }
+
+    if (rotateUp)
+    {
+        // Rotate up direction around right axis
+        camera->up = Vector3RotateByAxisAngle(camera->up, right, angle);
+    }
+}
+
+// Rotates the camera around its forward vector
+// Roll is "turning your head sideways to the left or right"
+// Note: angle must be provided in radians
+void CameraRoll(Camera *camera, float angle)
+{
+    // Rotation axis
+    Vector3 forward = GetCameraForward(camera);
+
+    // Rotate up direction around forward axis
+    camera->up = Vector3RotateByAxisAngle(camera->up, forward, angle);
+}
+
+// Returns the camera view matrix
+Matrix GetCameraViewMatrix(Camera *camera)
+{
+    return MatrixLookAt(camera->position, camera->target, camera->up);
+}
+
+// Returns the camera projection matrix
+Matrix GetCameraProjectionMatrix(Camera *camera, float aspect)
+{
+    if (camera->projection == CAMERA_PERSPECTIVE)
+    {
+        return MatrixPerspective(camera->fovy*DEG2RAD, aspect, CAMERA_CULL_DISTANCE_NEAR, CAMERA_CULL_DISTANCE_FAR);
+    }
+    else if (camera->projection == CAMERA_ORTHOGRAPHIC)
+    {
+        double top = camera->fovy/2.0;
+        double right = top*aspect;
+
+        return MatrixOrtho(-right, right, -top, top, CAMERA_CULL_DISTANCE_NEAR, CAMERA_CULL_DISTANCE_FAR);
+    }
+
+    return MatrixIdentity();
+}
+
+#if !defined(RCAMERA_STANDALONE)
+// Update camera position for selected mode
+// Camera mode: CAMERA_FREE, CAMERA_FIRST_PERSON, CAMERA_THIRD_PERSON, CAMERA_ORBITAL or CUSTOM
+void UpdateCamera(Camera *camera, int mode)
+{
+    Vector2 mousePositionDelta = GetMouseDelta();
+
+    bool moveInWorldPlane = ((mode == CAMERA_FIRST_PERSON) || (mode == CAMERA_THIRD_PERSON));
+    bool rotateAroundTarget = ((mode == CAMERA_THIRD_PERSON) || (mode == CAMERA_ORBITAL));
+    bool lockView = ((mode == CAMERA_FREE) || (mode == CAMERA_FIRST_PERSON) || (mode == CAMERA_THIRD_PERSON) || (mode == CAMERA_ORBITAL));
+    bool rotateUp = false;
+
+    // Camera speeds based on frame time
+    float cameraMoveSpeed = CAMERA_MOVE_SPEED*GetFrameTime();
+    float cameraRotationSpeed = CAMERA_ROTATION_SPEED*GetFrameTime();
+    float cameraPanSpeed = CAMERA_PAN_SPEED*GetFrameTime();
+    float cameraOrbitalSpeed = CAMERA_ORBITAL_SPEED*GetFrameTime();
+
+    if (mode == CAMERA_CUSTOM) {}
+    else if (mode == CAMERA_ORBITAL)
+    {
+        // Orbital can just orbit
+        Matrix rotation = MatrixRotate(GetCameraUp(camera), cameraOrbitalSpeed);
+        Vector3 view = Vector3Subtract(camera->position, camera->target);
+        view = Vector3Transform(view, rotation);
+        camera->position = Vector3Add(camera->target, view);
+    }
+    else
+    {
+        // Camera rotation
+        if (IsKeyDown(KEY_DOWN)) CameraPitch(camera, -cameraRotationSpeed, lockView, rotateAroundTarget, rotateUp);
+        if (IsKeyDown(KEY_UP)) CameraPitch(camera, cameraRotationSpeed, lockView, rotateAroundTarget, rotateUp);
+        if (IsKeyDown(KEY_RIGHT)) CameraYaw(camera, -cameraRotationSpeed, rotateAroundTarget);
+        if (IsKeyDown(KEY_LEFT)) CameraYaw(camera, cameraRotationSpeed, rotateAroundTarget);
+        if (IsKeyDown(KEY_Q)) CameraRoll(camera, -cameraRotationSpeed);
+        if (IsKeyDown(KEY_E)) CameraRoll(camera, cameraRotationSpeed);
+
+        // Camera movement
+        // Camera pan (for CAMERA_FREE)
+        if ((mode == CAMERA_FREE) && (IsMouseButtonDown(MOUSE_BUTTON_MIDDLE)))
+        {
+            const Vector2 mouseDelta = GetMouseDelta();
+            if (mouseDelta.x > 0.0f) CameraMoveRight(camera, cameraPanSpeed, moveInWorldPlane);
+            if (mouseDelta.x < 0.0f) CameraMoveRight(camera, -cameraPanSpeed, moveInWorldPlane);
+            if (mouseDelta.y > 0.0f) CameraMoveUp(camera, -cameraPanSpeed);
+            if (mouseDelta.y < 0.0f) CameraMoveUp(camera, cameraPanSpeed);
+        }
+        else
+        {
+            // Mouse support
+            CameraYaw(camera, -mousePositionDelta.x*CAMERA_MOUSE_MOVE_SENSITIVITY, rotateAroundTarget);
+            CameraPitch(camera, -mousePositionDelta.y*CAMERA_MOUSE_MOVE_SENSITIVITY, lockView, rotateAroundTarget, rotateUp);
+        }
+
+        // Keyboard support
+        if (IsKeyDown(KEY_W)) CameraMoveForward(camera, cameraMoveSpeed, moveInWorldPlane);
+        if (IsKeyDown(KEY_A)) CameraMoveRight(camera, -cameraMoveSpeed, moveInWorldPlane);
+        if (IsKeyDown(KEY_S)) CameraMoveForward(camera, -cameraMoveSpeed, moveInWorldPlane);
+        if (IsKeyDown(KEY_D)) CameraMoveRight(camera, cameraMoveSpeed, moveInWorldPlane);
+
+        // Gamepad movement
+        if (IsGamepadAvailable(0))
+        {
+            // Gamepad controller support
+            CameraYaw(camera, -(GetGamepadAxisMovement(0, GAMEPAD_AXIS_RIGHT_X)*2)*CAMERA_MOUSE_MOVE_SENSITIVITY, rotateAroundTarget);
+            CameraPitch(camera, -(GetGamepadAxisMovement(0, GAMEPAD_AXIS_RIGHT_Y)*2)*CAMERA_MOUSE_MOVE_SENSITIVITY, lockView, rotateAroundTarget, rotateUp);
+
+            if (GetGamepadAxisMovement(0, GAMEPAD_AXIS_LEFT_Y) <= -0.25f) CameraMoveForward(camera, cameraMoveSpeed, moveInWorldPlane);
+            if (GetGamepadAxisMovement(0, GAMEPAD_AXIS_LEFT_X) <= -0.25f) CameraMoveRight(camera, -cameraMoveSpeed, moveInWorldPlane);
+            if (GetGamepadAxisMovement(0, GAMEPAD_AXIS_LEFT_Y) >= 0.25f) CameraMoveForward(camera, -cameraMoveSpeed, moveInWorldPlane);
+            if (GetGamepadAxisMovement(0, GAMEPAD_AXIS_LEFT_X) >= 0.25f) CameraMoveRight(camera, cameraMoveSpeed, moveInWorldPlane);
+        }
+
+        if (mode == CAMERA_FREE)
+        {
+            if (IsKeyDown(KEY_SPACE)) CameraMoveUp(camera, cameraMoveSpeed);
+            if (IsKeyDown(KEY_LEFT_CONTROL)) CameraMoveUp(camera, -cameraMoveSpeed);
+        }
+    }
+
+    if ((mode == CAMERA_THIRD_PERSON) || (mode == CAMERA_ORBITAL) || (mode == CAMERA_FREE))
+    {
+        // Zoom target distance
+        CameraMoveToTarget(camera, -GetMouseWheelMove());
+        if (IsKeyPressed(KEY_KP_SUBTRACT)) CameraMoveToTarget(camera, 2.0f);
+        if (IsKeyPressed(KEY_KP_ADD)) CameraMoveToTarget(camera, -2.0f);
+    }
+}
+#endif // !RCAMERA_STANDALONE
+
+// Update camera movement, movement/rotation values should be provided by user
+void UpdateCameraPro(Camera *camera, Vector3 movement, Vector3 rotation, float zoom)
+{
+    // Required values
+    // movement.x - Move forward/backward
+    // movement.y - Move right/left
+    // movement.z - Move up/down
+    // rotation.x - yaw
+    // rotation.y - pitch
+    // rotation.z - roll
+    // zoom - Move towards target
+
+    bool lockView = true;
+    bool rotateAroundTarget = false;
+    bool rotateUp = false;
+    bool moveInWorldPlane = true;
+
+    // Camera rotation
+    CameraPitch(camera, -rotation.y*DEG2RAD, lockView, rotateAroundTarget, rotateUp);
+    CameraYaw(camera, -rotation.x*DEG2RAD, rotateAroundTarget);
+    CameraRoll(camera, rotation.z*DEG2RAD);
+
+    // Camera movement
+    CameraMoveForward(camera, movement.x, moveInWorldPlane);
+    CameraMoveRight(camera, movement.y, moveInWorldPlane);
+    CameraMoveUp(camera, movement.z);
+
+    // Zoom target distance
+    CameraMoveToTarget(camera, zoom);
+}
+
+#endif // RCAMERA_IMPLEMENTATION