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Fostbite2D/include/fostbite2D/render/camera.h

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+#pragma once
+
+#include <fostbite2D/core/math_types.h>
+#include <fostbite2D/core/types.h>
+#include <glm/mat4x4.hpp>
+
+namespace frostbite2D {
+
+// ============================================================================
+// 2D 正交相机 - 简化版本，无服务和模块依赖
+// ============================================================================
+class Camera {
+public:
+  Camera();
+  Camera(float left, float right, float bottom, float top);
+  Camera(const Size &viewport);
+  ~Camera() = default;
+
+  // ------------------------------------------------------------------------
+  // 位置和变换
+  // ------------------------------------------------------------------------
+  void setPosition(const Vec2 &position);
+  void setPosition(float x, float y);
+  Vec2 getPosition() const { return position_; }
+
+  void setRotation(float degrees);
+  float getRotation() const { return rotation_; }
+
+  void setZoom(float zoom);
+  float getZoom() const { return zoom_; }
+
+  // ------------------------------------------------------------------------
+  // 视口设置
+  // ------------------------------------------------------------------------
+  void setViewport(float left, float right, float bottom, float top);
+  void setViewport(const Rect &rect);
+  Rect getViewport() const;
+
+  // ------------------------------------------------------------------------
+  // 矩阵获取
+  // ------------------------------------------------------------------------
+  glm::mat4 getViewMatrix() const;
+  glm::mat4 getProjectionMatrix() const;
+  glm::mat4 getViewProjectionMatrix() const;
+
+  // ------------------------------------------------------------------------
+  // 坐标转换
+  // ------------------------------------------------------------------------
+  Vec2 screenToWorld(const Vec2 &screenPos) const;
+  Vec2 worldToScreen(const Vec2 &worldPos) const;
+  Vec2 screenToWorld(float x, float y) const;
+  Vec2 worldToScreen(float x, float y) const;
+
+  // ------------------------------------------------------------------------
+  // 移动相机
+  // ------------------------------------------------------------------------
+  void move(const Vec2 &offset);
+  void move(float x, float y);
+
+  // ------------------------------------------------------------------------
+  // 边界限制
+  // ------------------------------------------------------------------------
+  void setBounds(const Rect &bounds);
+  void clearBounds();
+  void clampToBounds();
+
+  // ------------------------------------------------------------------------
+  // 快捷方法：看向某点
+  // ------------------------------------------------------------------------
+  void lookAt(const Vec2 &target);
+
+private:
+  Vec2 position_ = Vec2::Zero();
+  float rotation_ = 0.0f;
+  float zoom_ = 1.0f;
+
+  float left_ = -1.0f;
+  float right_ = 1.0f;
+  float bottom_ = -1.0f;
+  float top_ = 1.0f;
+
+  Rect bounds_;
+  bool hasBounds_ = false;
+
+  mutable glm::mat4 viewMatrix_;
+  mutable glm::mat4 projMatrix_;
+  mutable glm::mat4 vpMatrix_;
+  mutable bool viewDirty_ = true;
+  mutable bool projDirty_ = true;
+};
+
+} // namespace frostbite2D