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annotate src/loadso/os2/SDL_sysloadso.c @ 2359:b70b96e615d2 gsoc2008_iphone

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These files are the OpenGL ES render driver. You should be able to use them on any platform that supports OpenGL ES -- not just iPhone. The driver is based off the OpenGL render driver. There are a few differences between OpenGL and OpenGL ES that present difficulties for this driver: - OpenGL ES does NOT support many pixel formats (for example, no GL_BGR). Also, when using texture functions format and internalFormat must be the same -- this means 32 bit packed formats like SDL_PIXELFORMAT_BGR888 cannot be automatically converted to GL_RGB (which is 24bpp). - OpenGL ES doesn't have GL_PACK_ROW_LENGTH, which means data must be reformatted before uploading changes to dirty rects. This change has been added. - OpenGL ES doesn't support paletted textures, though there is an extension. I'm looking into this. Some other notable differences: - OpenGL ES has an extension called GL_OES_draw_texture which allows for quicker 2D sprite-type drawing. I use this in GL_RenderCopy when it is available. The iPhone supports the extension, but the iPhone Simulator does not (presently). - No glBegin() / glEnd() and no GL_QUADS! I'm using glDrawArrays with GL_TRIANGLE_STRIP instead!
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Thu, 17 Jul 2008 23:31:42 +0000
parents c121d94672cb
children 3e42ad69f4a3
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifdef SDL_LOADSO_OS2
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25
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26 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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27 /* System dependent library loading routines */
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28
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29 #include <stdio.h>
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30 #define INCL_DOSERRORS
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31 #define INCL_DOSMODULEMGR
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32 #include <os2.h>
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33
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34 #include "SDL_loadso.h"
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35
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36 void *
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37 SDL_LoadObject(const char *sofile)
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38 {
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39 HMODULE handle = NULL;
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40 char buf[512];
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41 APIRET ulrc = DosLoadModule(buf, sizeof(buf), (char *) sofile, &handle);
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42
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43 /* Generate an error message if all loads failed */
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44 if ((ulrc != NO_ERROR) || (handle == NULL))
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45 SDL_SetError("Failed loading %s: %s", sofile, buf);
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46
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47 return ((void *) handle);
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48 }
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49
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50 void *
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51 SDL_LoadFunction(void *handle, const char *name)
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52 {
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53 const char *loaderror = "Unknown error";
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54 void *symbol = NULL;
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55 APIRET ulrc =
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56 DosQueryProcAddr((HMODULE) handle, 0, (char *) name, &symbol);
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57 if (ulrc == ERROR_INVALID_HANDLE)
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58 loaderror = "Invalid module handle";
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59 else if (ulrc == ERROR_INVALID_NAME)
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60 loaderror = "Symbol not found";
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61
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62 if (symbol == NULL)
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63 SDL_SetError("Failed loading %s: %s", name, loaderror);
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64
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65 return (symbol);
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66 }
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67
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68 void
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69 SDL_UnloadObject(void *handle)
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70 {
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71 if (handle != NULL)
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72 DosFreeModule((HMODULE) handle);
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73 }
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74
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75 #endif /* SDL_LOADSO_OS2 */
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76 /* vi: set ts=4 sw=4 expandtab: */