BlockArena, a bit of allocator rework

src/render/opengl.cpp

@@ -27,7 +27,7 @@ int64_t      TotalVertexCount;
 
 unsigned VBO, VAO;
 Shader   Shader2D;
-Arena    RenderArena;
+BlockArena RenderArena;
 Rect2    CurrentScissor;
 
 Font MainFont;
@@ -139,12 +139,6 @@ Shader CreateShaderES3(const char *vsrc, const char *fsrc) {
 
 // ---------- InitRender for ES3 ----------
 void InitRender() {
-#if OS_WASM
-    RenderArena = *AllocArena(GetSystemAllocator(), MiB(64));
-#else
-    InitArena(&RenderArena);
-#endif
-
 #if !OS_WASM
     glDebugMessageCallback(&GLDebugCallback, NULL);
     glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
@@ -184,7 +178,7 @@ void InitRender() {
 }
 
 void BeginFrameRender(float wx, float wy) {
-    Clear(&RenderArena);
+    Release(&RenderArena);
     TotalVertexCount = 0;
     Vertices.first   = NULL;
     Vertices.last    = NULL;
@@ -392,8 +386,6 @@ void DrawCircle(Vec2 pos, float radius, Color color) {
     }
 }
 
-
-// ---------- ReloadFont - replace DSA texture calls ----------
 void ReloadFont() {
     Int size = StyleFontSize;
     size = ClampBottom((Int)2, size);