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util-memory: Memory utility functions

This commit is contained in:
Michael Fabian 'Xaymar' Dirks 2018-01-08 10:52:53 +01:00
parent 8ae69cbe2c
commit 32ed7b645a
3 changed files with 74 additions and 0 deletions
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2
CMakeLists.txt
View File

@ -49,6 +49,7 @@ SET(obs-stream-effects_HEADERS
"${PROJECT_BINARY_DIR}/source/version.h"
"${PROJECT_SOURCE_DIR}/source/strings.h"
"${PROJECT_SOURCE_DIR}/source/util-math.h"
"${PROJECT_SOURCE_DIR}/source/util-memory.h"
)
SET(obs-stream-effects_SOURCES
"${PROJECT_SOURCE_DIR}/source/plugin.cpp"
@ -67,6 +68,7 @@ SET(obs-stream-effects_SOURCES
"${PROJECT_SOURCE_DIR}/source/gs-vertexbuffer.cpp"
"${PROJECT_SOURCE_DIR}/source/gs-mipmapper.cpp"
"${PROJECT_SOURCE_DIR}/source/util-math.cpp"
"${PROJECT_SOURCE_DIR}/source/util-memory.cpp"
)
SET(obs-stream-effects_LOCALE
"${PROJECT_SOURCE_DIR}/data/locale/en-US.ini"

47
source/util-memory.cpp Normal file
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@ -0,0 +1,47 @@
/*
* Modern effects for a modern Streamer
* Copyright (C) 2017 Michael Fabian Dirks
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "util-memory.h"
#include <cstdlib>
inline size_t aligned_offset(size_t align, size_t size) {
return ((size / align) + 1) * align;
}
void* util::aligned_malloc(size_t align, size_t size) {
// Ensure that we have space for the pointer and the data.
size_t asize = aligned_offset(align, size + sizeof(void*));
// Allocate memory and store integer representation of pointer.
void* ptr = malloc(asize);
// Calculate actual aligned position
intptr_t ptr_off = aligned_offset(align, reinterpret_cast<size_t>(ptr)+sizeof(void*));
// Store actual pointer at ptr_off - sizeof(void*).
*reinterpret_cast<intptr_t*>(ptr_off - sizeof(void*)) = reinterpret_cast<intptr_t>(ptr);
// Return aligned pointer
return reinterpret_cast<void*>(ptr_off);
}
void util::free_aligned(void* mem) {
void* ptr = reinterpret_cast<void*>(*reinterpret_cast<intptr_t*>(static_cast<char*>(mem)-sizeof(void*)));
free(ptr);
}

25
source/util-memory.h Normal file
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@ -0,0 +1,25 @@
/*
* Modern effects for a modern Streamer
* Copyright (C) 2017 Michael Fabian Dirks
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#pragma once
namespace util {
void* aligned_malloc(size_t align, size_t size);
void free_aligned(void* mem);
};