Working on optimization: GPU skinning and binary animations

src/Character.h

@@ -23,6 +23,7 @@ enum class AnimationState {
 class Character {
 public:
     void loadAnimation(AnimationState state, const std::string& filename, const std::string& zipFile = "");
+    void loadBinaryAnimation(AnimationState state, const std::string& filename, const std::string& zipFile = "");
     // void setTexture(std::shared_ptr<Texture> texture);
     void setTexture(std::shared_ptr<Texture> texture) {
         this->texture = texture;
@@ -59,6 +60,7 @@ public:
     bool canAttack = false;
     Character* attackTarget = nullptr;
     bool isPlayer = false;
+    bool useGpuSkinning = true;
 
 private:
     struct AnimationData {
@@ -67,6 +69,15 @@ private:
         float currentFrame = 0.f;
         int lastFrame = -1;
         int totalFrames = 1;
+
+        // GPU skinning data (lazily initialized)
+        VertexRenderStruct bindPoseMutable;
+        std::shared_ptr<VBOHolder> boneIndices0VBO;
+        std::shared_ptr<VBOHolder> boneIndices1VBO;
+        std::shared_ptr<VBOHolder> boneWeights0VBO;
+        std::shared_ptr<VBOHolder> boneWeights1VBO;
+        bool gpuSkinningPrepared = false;
+        std::vector<Eigen::Matrix4f> skinningMatrices;
     };
 
     std::map<AnimationState, AnimationData> animations;
@@ -81,6 +92,11 @@ private:
     // Returns the animation state to actually play/draw, falling back to IDLE
     // if the requested state has no loaded animation.
     AnimationState resolveActiveState() const;
+
+    // GPU skinning: prepare per-animation VBOs (called lazily on first draw)
+    void prepareGpuSkinningVBOs(AnimationData& anim);
+    // GPU skinning: draw using shader-based skinning
+    void drawGpuSkinning(Renderer& renderer);
 };
 
 } // namespace ZL