gamebuf: allocate only once per game launch

CHANGELOG.md

@@ -6,6 +6,7 @@
 - fixed `/give` console command confusing logging around mismatched items (#1463, regression from 3.0)
 - fixed `/flip` console command misreporting an already enabled flipmap as off (regression from 4.0)
 - fixed console commands causing improper ring shutdown with selected inventory item (#1460, regression from 3.0)
+- improved level load times
 - improved logs module names readability
 - improved crash debug information on Windows
 

src/game/gamebuf.c

@@ -63,6 +63,18 @@ void GameBuf_Init(void)
     m_GameAllocMemFree = MALLOC_SIZE;
 }
 
+void GameBuf_Reset(void)
+{
+    if (m_GameMemoryPointer == NULL) {
+        m_GameAllocMemPointer = NULL;
+        m_GameAllocMemFree = 0;
+        return;
+    }
+
+    m_GameAllocMemPointer = m_GameMemoryPointer;
+    m_GameAllocMemFree = MALLOC_SIZE;
+}
+
 void GameBuf_Shutdown(void)
 {
     Memory_FreePointer(&m_GameMemoryPointer);

src/game/gamebuf.h

@@ -48,5 +48,6 @@ typedef enum GAME_BUFFER {
 } GAME_BUFFER;
 
 void GameBuf_Init(void);
+void GameBuf_Reset(void);
 void *GameBuf_Alloc(int32_t alloc_size, GAME_BUFFER buffer);
 void GameBuf_Shutdown(void);

src/game/level.c

@@ -70,8 +70,7 @@ static size_t Level_CalculateMaxVertices(void);
 static void Level_LoadFromFile(
     const char *filename, int32_t level_num, bool is_demo)
 {
-    GameBuf_Shutdown();
-    GameBuf_Init();
+    GameBuf_Reset();
 
     MYFILE *fp = File_Open(filename, FILE_OPEN_READ);
     if (!fp) {

src/game/shell.c

@@ -122,6 +122,7 @@ void Shell_Init(const char *gameflow_path)
         return;
     }
 
+    GameBuf_Init();
     Text_Init();
     Clock_Init();
     Sound_Init();