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view src/video/uikit/SDL_uikitvideo.m @ 3162:dc1eb82ffdaa
Von: Thomas Zimmermann
Betreff: [SDL] [PATCH] Make static variables const
Datum: Tue, 19 May 2009 19:45:37 +0200
Hi,
this is a set of simple changes which make some of SDL's internal static
arrays constant. The purpose is to shrink the number of write-able
static bytes and thus increase the number of memory pages shared between
SDL applications.
The patch set is against trunk@4513. Each of the attached patch files is
specific to a sub-system. The set is completed by a second mail, because
of the list's 40 KiB limit.
The files readelf-r4513.txt and readelf-const-patch.txt where made by
calling 'readelf -S libSDL.so'. They show the difference in ELF sections
without and with the patch. Some numbers measured on my x86-64:
Before
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000008170 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 00000000003045e0 001045e0
00000000000023d0 0000000000000000 WA 0 0 32
[23] .data PROGBITS 00000000003076e0 001076e0
0000000000004988 0000000000000000 WA 0 0 32
After
[13] .rodata PROGBITS 00000000000eaaa0 000eaaa0
0000000000009a50 0000000000000000 A 0 0 32
[19] .data.rel.ro PROGBITS 0000000000306040 00106040
0000000000002608 0000000000000000 WA 0 0 32
[23] .data PROGBITS 0000000000309360 00109360
0000000000002e88 0000000000000000 WA 0 0 32
The size of the write-able data section decreased considerably. Some
entries became const-after-relocation, while most of its content went
straight into the read-only data section.
Best regards, Thomas
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 03 Jun 2009 04:37:27 +0000 |
parents | 99210400e8b9 |
children | 8b18669c2663 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" #include "SDL_video.h" #include "SDL_mouse.h" #include "../SDL_sysvideo.h" #include "../SDL_pixels_c.h" #include "../../events/SDL_events_c.h" #include "SDL_uikitvideo.h" #include "SDL_uikitevents.h" #include "SDL_uikitwindow.h" #include "SDL_uikitopengles.h" #include "SDL_renderer_sw.h" #include "SDL_renderer_gles.h" #define UIKITVID_DRIVER_NAME "uikit" /* Initialization/Query functions */ static int UIKit_VideoInit(_THIS); static int UIKit_SetDisplayMode(_THIS, SDL_DisplayMode * mode); static void UIKit_VideoQuit(_THIS); /* DUMMY driver bootstrap functions */ static int UIKit_Available(void) { return (1); } static void UIKit_DeleteDevice(SDL_VideoDevice * device) { SDL_free(device); } static SDL_VideoDevice * UIKit_CreateDevice(int devindex) { SDL_VideoDevice *device; /* Initialize all variables that we clean on shutdown */ device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice)); if (!device) { SDL_OutOfMemory(); if (device) { SDL_free(device); } return (0); } /* Set the function pointers */ device->VideoInit = UIKit_VideoInit; device->VideoQuit = UIKit_VideoQuit; device->SetDisplayMode = UIKit_SetDisplayMode; device->PumpEvents = UIKit_PumpEvents; device->CreateWindow = UIKit_CreateWindow; device->DestroyWindow = UIKit_DestroyWindow; /* OpenGL (ES) functions */ device->GL_MakeCurrent = UIKit_GL_MakeCurrent; device->GL_SwapWindow = UIKit_GL_SwapWindow; device->GL_CreateContext = UIKit_GL_CreateContext; device->GL_DeleteContext = UIKit_GL_DeleteContext; device->GL_GetProcAddress = UIKit_GL_GetProcAddress; device->GL_LoadLibrary = UIKit_GL_LoadLibrary; device->free = UIKit_DeleteDevice; device->gl_config.accelerated = 1; return device; } VideoBootStrap UIKIT_bootstrap = { UIKITVID_DRIVER_NAME, "SDL UIKit video driver", UIKit_Available, UIKit_CreateDevice }; int UIKit_VideoInit(_THIS) { SDL_DisplayMode mode; _this->gl_config.driver_loaded = 1; SDL_VideoDisplay display; SDL_zero(display); /* Use a 32-bpp desktop mode */ SDL_zero(mode); mode.format = SDL_PIXELFORMAT_ABGR8888; mode.w = 320; mode.h = 480; mode.refresh_rate = 0; mode.driverdata = NULL; display.num_display_modes = 1; display.max_display_modes = 1; display.display_modes = (SDL_DisplayMode *)SDL_malloc(display.max_display_modes * sizeof(SDL_DisplayMode)); display.display_modes[0] = mode; display.desktop_mode = mode; display.fullscreen_mode = mode; display.current_mode = mode; SDL_AddVideoDisplay(&display); /* We're done! */ return 0; } static int UIKit_SetDisplayMode(_THIS, SDL_DisplayMode * mode) { return 0; } void UIKit_VideoQuit(_THIS) { } /* vi: set ts=4 sw=4 expandtab: */