Initial commit: wowee native WoW 3.3.5a client

include/rendering/lens_flare.hpp

@@ -0,0 +1,85 @@
+#pragma once
+
+#include <GL/glew.h>
+#include <glm/glm.hpp>
+#include <memory>
+#include <vector>
+
+namespace wowee {
+namespace rendering {
+
+class Camera;
+class Shader;
+
+/**
+ * @brief Renders lens flare effect when looking at the sun
+ *
+ * Features:
+ * - Multiple flare elements (ghosts) along sun-to-center axis
+ * - Sun glow at sun position
+ * - Colored flare elements (chromatic aberration simulation)
+ * - Intensity based on sun visibility and angle
+ * - Additive blending for realistic light artifacts
+ */
+class LensFlare {
+public:
+    LensFlare();
+    ~LensFlare();
+
+    /**
+     * @brief Initialize lens flare system
+     * @return true if initialization succeeded
+     */
+    bool initialize();
+
+    /**
+     * @brief Render lens flare effect
+     * @param camera The camera to render from
+     * @param sunPosition World-space sun position
+     * @param timeOfDay Current time (0-24 hours)
+     */
+    void render(const Camera& camera, const glm::vec3& sunPosition, float timeOfDay);
+
+    /**
+     * @brief Enable or disable lens flare rendering
+     */
+    void setEnabled(bool enabled) { this->enabled = enabled; }
+    bool isEnabled() const { return enabled; }
+
+    /**
+     * @brief Set flare intensity multiplier
+     */
+    void setIntensity(float intensity);
+    float getIntensity() const { return intensityMultiplier; }
+
+private:
+    struct FlareElement {
+        float position;      // Position along sun-center axis (-1 to 1, 0 = center)
+        float size;          // Size in screen space
+        glm::vec3 color;     // RGB color
+        float brightness;    // Brightness multiplier
+    };
+
+    void generateFlareElements();
+    void cleanup();
+    float calculateSunVisibility(const Camera& camera, const glm::vec3& sunPosition) const;
+    glm::vec2 worldToScreen(const Camera& camera, const glm::vec3& worldPos) const;
+
+    // OpenGL objects
+    GLuint vao = 0;
+    GLuint vbo = 0;
+    std::unique_ptr<Shader> shader;
+
+    // Flare elements
+    std::vector<FlareElement> flareElements;
+
+    // Parameters
+    bool enabled = true;
+    float intensityMultiplier = 1.0f;
+
+    // Quad vertices for rendering flare sprites
+    static constexpr int VERTICES_PER_QUAD = 6;
+};
+
+} // namespace rendering
+} // namespace wowee