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Fixed bug #84 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:04:40 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/*
    SDL_epocvideo.h
    Epoc based SDL video driver implementation

    Epoc version by Hannu Viitala (hannu.j.viitala@mbnet.fi)
*/

#ifndef _SDL_epocvideo_h
#define _SDL_epocvideo_h

extern "C" {
#include "SDL_mouse.h"
#include "../SDL_sysvideo.h"
};

#include <e32std.h>
#include <bitdev.h> 
#include <w32std.h>

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_VideoDevice *_this
#define Private	_this->hidden

#define SDL_NUMMODES	4

/* Private display data */
struct SDL_PrivateVideoData {

    SDL_Rect            *SDL_modelist[SDL_NUMMODES+1];

	/* Epoc window server info */
    
    RWsSession			EPOC_WsSession;
	RWindowGroup		EPOC_WsWindowGroup;
    TInt                EPOC_WsWindowGroupID;
	RWindow				EPOC_WsWindow;
	CWsScreenDevice*	EPOC_WsScreen;
	CWindowGc*			EPOC_WindowGc;
	TRequestStatus		EPOC_WsEventStatus;
	TRequestStatus		EPOC_RedrawEventStatus;
	TWsEvent			EPOC_WsEvent;
	TWsRedrawEvent		EPOC_RedrawEvent;
    #ifdef __WINS__
    CWsBitmap*          EPOC_Bitmap;
    #endif
    TBool               EPOC_IsWindowFocused; //!!Not used for anything yet!

    /* Screen hardware frame buffer info */

   	TBool				EPOC_HasFrameBuffer;
	TInt				EPOC_BytesPerPixel;
	TInt				EPOC_BytesPerScanLine;
	TDisplayMode		EPOC_DisplayMode;
	TSize				EPOC_ScreenSize;
	TUint8*				EPOC_FrameBuffer;		/* if NULL in HW we can't do direct screen access */
    TInt                EPOC_ScreenOffset;

    /* Simulate double screen height */
    TBool               EPOC_ShrinkedHeight;
};

extern "C" {
extern void RedrawWindowL(_THIS);
};


#endif /* _SDL_epocvideo_h */