Use a more efficient method of streaming automatically batched vertices on AMD Windows and Linux systems.

--HG--
branch : minor

src/common/memory.cpp

@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) 2006-2017 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#include "config.h"
+#include "memory.h"
+
+#include <stdlib.h>
+
+#ifdef LOVE_WINDOWS
+#include <malloc.h>
+#else
+#include <unistd.h> // Assume POSIX support.
+#endif
+
+namespace love
+{
+
+bool alignedMalloc(void **mem, size_t size, size_t alignment)
+{
+#ifdef LOVE_WINDOWS
+	*mem = _aligned_malloc(size, alignment);
+	return *mem != nullptr;
+#else
+	return posix_memalign(mem, alignment, size) != 0;
+#endif
+}
+
+void alignedFree(void *mem)
+{
+#ifdef LOVE_WINDOWS
+	_aligned_free(mem);
+#else
+	free(mem);
+#endif
+}
+
+size_t getPageSize()
+{
+#ifdef LOVE_WINDOWS
+	// TODO: Do an actual query.
+	return 4096;
+#else
+	static const long size = sysconf(_SC_PAGESIZE);
+	return size > 0 ? (size_t) size : 4096;
+#endif
+}
+
+size_t alignUp(size_t size, size_t alignment)
+{
+	return (size + alignment - 1) & (~(alignment - 1));
+}
+
+} // love