Mercurial > sdl-ios-xcode
view src/video/Xext/XmuStdCmap/DelCmap.c @ 2359:b70b96e615d2 gsoc2008_iphone
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 | 2032348afed1 |
| children |
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/* $Xorg: DelCmap.c,v 1.4 2001/02/09 02:03:52 xorgcvs Exp $ */ /* Copyright 1989, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. */ /* $XFree86: xc/lib/Xmu/DelCmap.c,v 1.6 2001/01/17 19:42:54 dawes Exp $ */ /* * Author: Donna Converse, MIT X Consortium */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <X11/Xlib.h> #include <X11/Xutil.h> #include "../extensions/StdCmap.h" /* To remove any standard colormap property, use XmuDeleteStandardColormap(). * XmuDeleteStandardColormap() will remove the specified property from the * specified screen, releasing any resources used by the colormap(s) of the * property if possible. */ void XmuDeleteStandardColormap(Display * dpy, int screen, Atom property) /* dpy; - specifies the X server to connect to * screen - specifies the screen of the display * property - specifies the standard colormap property */ { XStandardColormap *stdcmaps, *s; int count = 0; if (XGetRGBColormaps(dpy, RootWindow(dpy, screen), &stdcmaps, &count, property)) { for (s = stdcmaps; count > 0; count--, s++) { if ((s->killid == ReleaseByFreeingColormap) && (s->colormap != None) && (s->colormap != DefaultColormap(dpy, screen))) XFreeColormap(dpy, s->colormap); else if (s->killid != None) XKillClient(dpy, s->killid); } XDeleteProperty(dpy, RootWindow(dpy, screen), property); XFree((char *) stdcmaps); XSync(dpy, False); } }