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engines/watchmaker/3d/mem_management.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "watchmaker/3d/mem_management.h"
+#include "watchmaker/types.h"
+#include "watchmaker/ll/ll_system.h"
+
+namespace Watchmaker {
+
+static int8    *MemoryPool = nullptr;
+static uint32   MemoryPoolPointer = 0;
+static uint32   MaxAllocatedMem = 0;
+
+// Memory Management
+// Only linear (non dynamic) stack allocations
+
+
+/* -----------------10/06/99 16.06-------------------
+ *              t3dAllocMemoryPool
+ * --------------------------------------------------*/
+uint8 t3dAllocMemoryPool(uint32 pool) {
+	uint8 allocated = 0;
+
+	MemoryPoolPointer = 0;
+	while ((allocated == 0) && (pool > 0)) {
+		if (!(MemoryPool = t3dCalloc<int8>(pool)))
+			pool -= 10000;
+		else
+			allocated = 1;
+	}
+
+	if (allocated == 0)
+		return 0;
+	else {
+		MaxAllocatedMem = pool;
+		return 1;
+	}
+}
+
+/* -----------------10/06/99 16.07-------------------
+ *                  t3dDeallocMemoryPool
+ * --------------------------------------------------*/
+void t3dDeallocMemoryPool() {
+	if (MemoryPool == nullptr) return;
+	t3dFree(MemoryPool);
+	MemoryPool = nullptr;
+	MaxAllocatedMem = 0;
+}
+
+/* -----------------10/06/99 16.07-------------------
+ *                      t3dAlloc
+ * --------------------------------------------------*/
+void *t3dAlloc(uint32 size) {
+	if (MemoryPool == nullptr) return nullptr;
+	MemoryPoolPointer += size;
+	if (MemoryPoolPointer > MaxAllocatedMem) {
+		return nullptr;
+	}
+
+	return &MemoryPool[MemoryPoolPointer - size];
+}
+
+/* -----------------10/06/99 16.07-------------------
+ *                  t3dDealloc
+ * --------------------------------------------------*/
+void *t3dDealloc(uint32 size) {
+	if (MemoryPool == nullptr) return nullptr;
+	MemoryPoolPointer -= size;
+	return &MemoryPool[MemoryPoolPointer];
+}
+
+} // End of namespace Watchmaker