# Work at gfx driver system

- Update pool to use template allocator directly instead of std::vector
- Add a GfxDriver config Template to be able to modify settings like allocators / Types for specific Drivers
- Add glad

include/pd/drivers/gfx.hpp

@@ -22,25 +22,78 @@ enum class TextureFormat {
   A8,
 };
 
+// Pre interface class
 class PD_API GfxDriver : public DriverInterface {
  public:
-  GfxDriver(std::string_view name = "Default") : DriverInterface(name) {}
-  virtual ~GfxDriver() {}
+  GfxDriver(std::string_view name);
+  virtual ~GfxDriver() = default;
 
   virtual void Init() {}
-  virtual void Deinit() {}
-  virtual void Submit() {}
+
+  void SetViewPort(const ivec2& size);
+  void SetViewPort(int x, int y);
   virtual void BindTexture(TextureID id) {}
-  virtual void Reset() {}
+  void Reset();
   virtual TextureID LoadTexture(const std::vector<PD::u8>& pixels, int w, int h,
                                 TextureFormat type = TextureFormat::RGBA32,
-                                TextureFilter filter = TextureFilter::Linear) {}
+                                TextureFilter filter = TextureFilter::Linear) {
+    return 0;
+  }
   virtual void DeleteTexture(const TextureID& tex) {}
-  void Draw(const std::vector<Li::Command>& commands) {
+  virtual void Draw(const Pool<Li::Command>& commands) {}
+
+ protected:
+  virtual void SysDeinit() {}
+  virtual void SysInit() {}
+  virtual void SysReset() {}
+  virtual void Submit(size_t count, size_t start) {}
+  virtual void ResetPools() = 0;
+
+  // Counters
+  size_t CountDrawcalls = 0;
+  size_t CountCommands = 0;
+  size_t CountVertices = 0;
+  size_t CountIndices = 0;
+  size_t CurrentIndex = 0;
+  size_t CurrentVertex = 0;
+  TextureID CurrentTex = 0;
+  Mat4 Projection;
+  ivec2 ViewPort;
+};
+
+struct DefaultGfxConfig {
+  // Vertex Allocator
+  template <typename T>
+  using VertexAlloc = std::allocator<T>;
+  // Index Allocator
+  template <typename T>
+  using IndexAlloc = std::allocator<T>;
+  using IndexType = u16;  // Index Type
+
+  static constexpr size_t NumVertices = 32768;  // 8192*4
+  static constexpr size_t NumIndices = 49152;   // 8192*6
+};
+
+template <typename Config = DefaultGfxConfig>
+class PD_API GfxDriverBase : public GfxDriver {
+ public:
+  using IndexType = Config::IndexType;
+  using VtxPool =
+      Pool<Li::Vertex, typename Config::template VertexAlloc<Li::Vertex>>;
+  using IdxPool =
+      Pool<IndexType, typename Config::template VertexAlloc<IndexType>>;
+  GfxDriverBase(std::string_view name = "Default") : GfxDriver(name) {}
+  virtual ~GfxDriverBase() {}
+
+  void Init() override {
+    pVtxPool.Init(Config::NumVertices);
+    pIdxPool.Init(Config::NumIndices);
+    SysInit();
+  }
+
+  void Draw(const Pool<Li::Command>& commands) override {
     CountCommands += commands.size();
-    // Bind shader
     Projection = Mat4::Ortho(0.f, ViewPort.x, ViewPort.y, 0.f, 1.f, -1.f);
-    // Shader Set Mtx
     size_t index = 0;
     while (index < commands.size()) {
       CurrentTex = commands[index].Tex;
@@ -48,21 +101,36 @@ class PD_API GfxDriver : public DriverInterface {
         index++;
         continue;
       }
+      size_t startidx = CurrentIndex;
+      while (index < commands.size() && CurrentTex == commands[index].Tex) {
+        const auto& c = commands[index];
+        CountVertices += c.VertexCount;
+        CountIndices += c.IndexCount;
+        auto pIdx = pIdxPool.Allocate(c.IndexCount);
+        auto pVtx = pVtxPool.Allocate(c.VertexCount);
+        for (size_t i = 0; i < c.IndexCount; i++) {
+          pIdx[i] = CurrentVertex + c.FirstIndex[i];
+        }
+        for (size_t i = 0; i < c.VertexCount; i++) {
+          pVtx[i] = c.FirstVertex[i];
+        }
+        index++;
+      }
+      Submit(index - startidx, startidx);
     }
   }
 
- private:
-  size_t CurrentIndex = 0;
-  size_t CurrentVertex = 0;
-  TextureID CurrentTex = 0;
-  Mat4 Projection;
-  ivec2 ViewPort;
+ protected:
+  IndexType* GetIndexBufPtr(size_t start) { return &pIdxPool[start]; }
+  Li::Vertex* GetVertexBufPtr(size_t start) { return &pVtxPool[start]; }
+  void ResetPools() override {
+    pVtxPool.Reset();
+    pIdxPool.Reset();
+  }
 
-  // Counters
-  size_t CountDrawcalls = 0;
-  size_t CountCommands = 0;
-  size_t CountVertices = 0;
-  size_t CountIndices = 0;
+ private:
+  VtxPool pVtxPool;
+  IdxPool pIdxPool;
 };
 
 class PD_API Gfx {