Add configurable MSAA anti-aliasing, update auth screen and terrain shader

- MSAA: conditional 2-att (off) vs 3-att (on) render pass with auto-resolve
- MSAA: multisampled color+depth images, query max supported sample count
- MSAA: .setMultisample() on all 25+ main-pass pipelines across 17 renderers
- MSAA: recreatePipelines() on every sub-renderer for runtime MSAA changes
- MSAA: Renderer::setMsaaSamples() orchestrates swapchain+pipeline+ImGui rebuild
- MSAA: Anti-Aliasing combo (Off/2x/4x/8x) in Video settings, persisted
- Update auth screen assets and terrain fragment shader

include/rendering/celestial.hpp

@@ -32,6 +32,7 @@ public:
      */
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     /**
      * Render celestial bodies (sun and moons).

include/rendering/character_renderer.hpp

@@ -58,6 +58,7 @@ public:
     void update(float deltaTime, const glm::vec3& cameraPos = glm::vec3(0.0f));
 
     void render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet, const Camera& camera);
+    void recreatePipelines();
     bool initializeShadow(VkRenderPass shadowRenderPass);
     void renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMatrix);
 

include/rendering/charge_effect.hpp

@@ -24,6 +24,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     /// Try to load M2 spell models (Charge_Caster.m2, etc.)
     void tryLoadM2Models(M2Renderer* m2Renderer, pipeline::AssetManager* assets);

include/rendering/clouds.hpp

@@ -35,6 +35,7 @@ public:
      */
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     /**
      * Render clouds.

include/rendering/lens_flare.hpp

@@ -39,6 +39,8 @@ public:
      */
     void shutdown();
 
+    void recreatePipelines();
+
     /**
      * @brief Render lens flare effect
      * @param cmd Command buffer to record into

include/rendering/lightning.hpp

@@ -28,6 +28,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     void update(float deltaTime, const Camera& camera);
     void render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet);

include/rendering/m2_renderer.hpp

@@ -281,6 +281,8 @@ public:
     double getQueryTimeMs() const { return queryTimeMs; }
     uint32_t getQueryCallCount() const { return queryCallCount; }
 
+    void recreatePipelines();
+
     // Stats
     bool isInitialized() const { return initialized_; }
     uint32_t getModelCount() const { return static_cast<uint32_t>(models.size()); }

include/rendering/mount_dust.hpp

@@ -18,6 +18,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     // Spawn dust particles at mount feet when moving on ground
     void spawnDust(const glm::vec3& position, const glm::vec3& velocity, bool isMoving);

include/rendering/quest_marker_renderer.hpp

@@ -27,6 +27,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout, pipeline::AssetManager* assetManager);
     void shutdown();
+    void recreatePipelines();
 
     /**
      * Add or update a quest marker at a position

include/rendering/renderer.hpp

@@ -241,6 +241,7 @@ private:
 public:
     void setShadowsEnabled(bool enabled) { shadowsEnabled = enabled; }
     bool areShadowsEnabled() const { return shadowsEnabled; }
+    void setMsaaSamples(VkSampleCountFlagBits samples);
 
 private:
     void renderShadowPass();

include/rendering/skybox.hpp

@@ -24,6 +24,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     /**
      * Render the skybox

include/rendering/starfield.hpp

@@ -23,6 +23,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
 
     /**
      * Render the star field

include/rendering/swim_effects.hpp

@@ -20,6 +20,7 @@ public:
 
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
     void shutdown();
+    void recreatePipelines();
     void update(const Camera& camera, const CameraController& cc,
                 const WaterRenderer& water, float deltaTime);
     void render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet);

include/rendering/terrain_renderer.hpp

@@ -104,6 +104,8 @@ public:
 
     void clear();
 
+    void recreatePipelines();
+
     void setWireframe(bool enabled) { wireframe = enabled; }
     void setFrustumCulling(bool enabled) { frustumCullingEnabled = enabled; }
     void setFogEnabled(bool enabled) { fogEnabled = enabled; }
@@ -139,7 +141,7 @@ private:
 
     // Descriptor pool for material sets
     VkDescriptorPool materialDescPool = VK_NULL_HANDLE;
-    static constexpr uint32_t MAX_MATERIAL_SETS = 8192;
+    static constexpr uint32_t MAX_MATERIAL_SETS = 16384;
 
     // Loaded terrain chunks
     std::vector<TerrainChunkGPU> chunks;

include/rendering/vk_context.hpp

@@ -71,6 +71,11 @@ public:
 
     bool isSwapchainDirty() const { return swapchainDirty; }
 
+    // MSAA
+    VkSampleCountFlagBits getMsaaSamples() const { return msaaSamples_; }
+    void setMsaaSamples(VkSampleCountFlagBits samples);
+    VkSampleCountFlagBits getMaxUsableSampleCount() const;
+
 private:
     bool createInstance(SDL_Window* window);
     bool createSurface(SDL_Window* window);
@@ -126,6 +131,15 @@ private:
     bool createDepthBuffer();
     void destroyDepthBuffer();
 
+    // MSAA resources
+    VkSampleCountFlagBits msaaSamples_ = VK_SAMPLE_COUNT_1_BIT;
+    VkImage msaaColorImage_ = VK_NULL_HANDLE;
+    VkImageView msaaColorView_ = VK_NULL_HANDLE;
+    VmaAllocation msaaColorAllocation_ = VK_NULL_HANDLE;
+
+    bool createMsaaColorImage();
+    void destroyMsaaColorImage();
+
     // ImGui resources
     VkRenderPass imguiRenderPass = VK_NULL_HANDLE;
     VkDescriptorPool imguiDescriptorPool = VK_NULL_HANDLE;

include/rendering/water_renderer.hpp

@@ -79,6 +79,8 @@ public:
     void removeTile(int tileX, int tileY);
     void clear();
 
+    void recreatePipelines();
+
     void render(VkCommandBuffer cmd, VkDescriptorSet perFrameSet, const Camera& camera, float time);
 
     void setEnabled(bool enabled) { renderingEnabled = enabled; }

include/rendering/weather.hpp

@@ -40,6 +40,7 @@ public:
      * @return true if initialization succeeded
      */
     bool initialize(VkContext* ctx, VkDescriptorSetLayout perFrameLayout);
+    void recreatePipelines();
 
     /**
      * @brief Update weather particles

include/rendering/wmo_renderer.hpp

@@ -156,6 +156,7 @@ public:
     /**
      * Get number of loaded models
      */
+    void recreatePipelines();
     bool isInitialized() const { return initialized_; }
     uint32_t getModelCount() const { return loadedModels.size(); }