Bring back global lithium pools

why?
cause sorting around the global driver pool would basically use more cpu power then just copy data sequences into the right order
And sorting data references costs 0 performance at all

source/lithium/command.cpp

@@ -1,23 +1,48 @@
 #include <pd/drivers/gfx.hpp>
 #include <pd/lithium/command.hpp>
+#include <pd/lithium/pools.hpp>
 
 namespace PD {
 namespace Li {
 
 void Command::Reserve(size_t vtx, size_t idx) {
+  auto& vpool = GetVertexPool();
+  auto& ipool = GetIndexPool();
   if (VertexCountMax == 0) {
-    FirstVertex = Gfx::AllocateVertices(vtx, (PD::ptr)this);
+    FirstVertex = vpool.size();
+    vpool.Allocate(vtx);
     VertexCountMax = vtx;
   } else {
-    Gfx::ExpandVertices(vtx, (PD::ptr)this);
-    VertexCountMax += vtx;
+    if (vpool.size() == FirstVertex + VertexCountMax) {
+      vpool.Allocate(vtx);
+      VertexCountMax += vtx;
+    } else {
+      size_t tmp = FirstVertex;
+      FirstVertex = vpool.size();
+      vpool.Allocate(VertexCountMax + vtx);
+      for (size_t i = 0; i < VertexCount; i++) {
+        vpool[FirstVertex + i] = vpool[tmp + i];
+      }
+      VertexCountMax += vtx;
+    }
   }
   if (IndexCountMax == 0) {
-    FirstIndex = Gfx::AllocateIndices(idx, (PD::ptr)this);
+    FirstIndex = ipool.size();
+    ipool.Allocate(idx);
     IndexCountMax = idx;
   } else {
-    Gfx::ExpandIndices(idx, (PD::ptr)this);
-    IndexCountMax += idx;
+    if (ipool.size() == FirstIndex + IndexCountMax) {
+      ipool.Allocate(idx);
+      IndexCountMax += idx;
+    } else {
+      size_t tmp = FirstIndex;
+      FirstIndex = ipool.size();
+      ipool.Allocate(IndexCountMax + idx);
+      for (size_t i = 0; i < IndexCount; i++) {
+        ipool[FirstIndex + i] = ipool[tmp + i];
+      }
+      IndexCountMax += idx;
+    }
   }
 }
 
@@ -34,22 +59,25 @@ void Command::Reset() {
 }
 
 Command& Command::Add(const Vertex& vtx) {
-  if (VertexCount <= VertexCountMax)
-    Gfx::PutVertex(FirstVertex + VertexCount++, vtx, (PD::ptr)this);
+  if (VertexCount < VertexCountMax) {
+    GetVertexPool()[FirstVertex + VertexCount++] = vtx;
+  }
   return *this;
 }
 Command& Command::Add(u16 idx) {
-  if (IndexCount <= IndexCountMax)
-    Gfx::PutIndex(FirstIndex + IndexCount++, FirstVertex + VertexCount + idx,
-                  (PD::ptr)this);
+  if (IndexCount < IndexCountMax) {
+    GetIndexPool()[FirstIndex + IndexCount++] =
+        static_cast<u16>(VertexCount + idx);
+  }
   return *this;
 }
 Command& Command::Add(u16 a, u16 b, u16 c) {
   if (IndexCount + 3 <= IndexCountMax) {
+    auto& ip = GetIndexPool();
     size_t idx = FirstIndex + IndexCount;
-    Gfx::PutIndex(idx + 0, FirstVertex + VertexCount + a, (PD::ptr)this);
-    Gfx::PutIndex(idx + 1, FirstVertex + VertexCount + b, (PD::ptr)this);
-    Gfx::PutIndex(idx + 2, FirstVertex + VertexCount + c, (PD::ptr)this);
+    ip[idx + 0] = static_cast<u16>(VertexCount + a);
+    ip[idx + 1] = static_cast<u16>(VertexCount + b);
+    ip[idx + 2] = static_cast<u16>(VertexCount + c);
     IndexCount += 3;
   }
   return *this;

source/lithium/drawlist.cpp

@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <iostream>
 #include <pd/drivers/gfx.hpp>
 #include <pd/lithium/drawlist.hpp>
@@ -19,19 +20,26 @@ PD_API void Drawlist::Copy(Drawlist& other) {
   pCommands.AppendCopy(other.pCommands);
 }
 
-PD_API void Drawlist::Optimize() {}
+PD_API void Drawlist::Optimize() {
+  if (pCommands.size() <= 1) return;
+  std::stable_sort(pCommands.begin(), pCommands.end(),
+                   [](const Command& a, const Command& b) {
+                     if (a.Layer != b.Layer) return a.Layer < b.Layer;
+                     if (a.SDF != b.SDF) return a.SDF < b.SDF;
+                     return a.Tex < b.Tex;
+                   });
+}
 
 PD_API void Drawlist::Clear() {
   UnbindTexture();
   pPath.ResetFast();
-  pVertices.ResetFast();
-  pIndices.ResetFast();
-  pCommands.ResetFast();
+  pCommands.NoReset();
 }
 
 /** Command Allocation */
 PD_API Command& Drawlist::NewCommand() {
   auto cmd = pCommands.Allocate(1);
+  cmd->Reset();
   cmd->Tex = pCurrentTexture.GetID();
   return *cmd;
 }

source/lithium/pools.cpp

@@ -0,0 +1,16 @@
+#include <pd/lithium/pools.hpp>
+
+namespace PD {
+namespace Li {
+static PD::Pool<Vertex> gVertexPool;
+static PD::Pool<u16> gIndexPool;
+
+PD_API PD::Pool<Vertex>& GetVertexPool() { return gVertexPool; }
+PD_API PD::Pool<u16>& GetIndexPool() { return gIndexPool; }
+
+PD_API void ResetPools() {
+  gVertexPool.NoReset();
+  gIndexPool.NoReset();
+}
+}  // namespace Li
+}  // namespace PD