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view src/video/ataricommon/SDL_atarigl.c @ 4223:63fd67e17705 SDL-1.2

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Fixed bug #727 Lorenzo Desole 2009-04-19 07:36:10 PDT I am one of the developers of a multimedia application (My Media System MMS), which uses SDL. MMS is normally running in fullscreen mode but it switches it off before launching external applications (mplayer, xine, etc.). The problem with fullscreen is that when the latter is switched off either via SDL_WM_ToggleFullScreen() or SDL_SetVideoMode(), SDL compares the current screen sizes with the ones saved when the video system was initted, and if they don't match, it calls XF86VidModeSwitchToMode() to switch to the old modeline. This makes it impossible for external programs and for MMS itself to use RandR to change the screen size, because next time fullscreen mode is turned off, it bombs out with the following error: X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 136 (XFree86-VidModeExtension) Minor opcode of failed request: 10 (XF86VidModeSwitchToMode) [...] Obviously this happens only if the new screen resolution is smaller than the original one and XF86VidModeSwitchToMode() can't succeed. I couldn't find any way to inform SDL that the screen resolution it uses as reference is no longer valid. This can be fixed by adding "save_mode(this)" to ./src/video/x11/SDL_x11modes.c, API X11_EnterFullScreen(_THIS), like this: int X11_EnterFullScreen(_THIS) { int okay; + save_mode(this); I can't rule out possible side effects, but I don't see any. While I admit this is a minor issue for the general users, it is a major showstopper for our program where the ability to change screen resolution and refresh rate according to the movie being played, is very important. Thanks in advance.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:14:36 +0000
parents a1b03ba2fcd0
children
line wrap: on
line source

/*
    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 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"

/* Atari OSMesa.ldg implementation of SDL OpenGL support */

/*--- Includes ---*/

#if SDL_VIDEO_OPENGL
#include <GL/osmesa.h>
#endif

#include <mint/osbind.h>

#include "SDL_endian.h"
#include "SDL_video.h"
#include "SDL_atarigl_c.h"
#if SDL_VIDEO_OPENGL_OSMESA_DYNAMIC
#include "SDL_loadso.h"
#endif

/*--- Defines ---*/

#define PATH_OSMESA_LDG	"osmesa.ldg"
#define PATH_MESAGL_LDG	"mesa_gl.ldg"
#define PATH_TINYGL_LDG	"tiny_gl.ldg"

#define VDI_RGB	0xf

/*--- Functions prototypes ---*/

static void SDL_AtariGL_UnloadLibrary(_THIS);

#if SDL_VIDEO_OPENGL
static void CopyShadowNull(_THIS, SDL_Surface *surface);
static void CopyShadowDirect(_THIS, SDL_Surface *surface);
static void CopyShadowRGBTo555(_THIS, SDL_Surface *surface);
static void CopyShadowRGBTo565(_THIS, SDL_Surface *surface);
static void CopyShadowRGBSwap(_THIS, SDL_Surface *surface);
static void CopyShadowRGBToARGB(_THIS, SDL_Surface *surface);
static void CopyShadowRGBToABGR(_THIS, SDL_Surface *surface);
static void CopyShadowRGBToBGRA(_THIS, SDL_Surface *surface);
static void CopyShadowRGBToRGBA(_THIS, SDL_Surface *surface);
static void CopyShadow8888To555(_THIS, SDL_Surface *surface);
static void CopyShadow8888To565(_THIS, SDL_Surface *surface);

static void ConvertNull(_THIS, SDL_Surface *surface);
static void Convert565To555be(_THIS, SDL_Surface *surface);
static void Convert565To555le(_THIS, SDL_Surface *surface);
static void Convert565le(_THIS, SDL_Surface *surface);
static void ConvertBGRAToABGR(_THIS, SDL_Surface *surface);

static int InitNew(_THIS, SDL_Surface *current);
static int InitOld(_THIS, SDL_Surface *current);
#endif

/*--- Public functions ---*/

int SDL_AtariGL_Init(_THIS, SDL_Surface *current)
{
#if SDL_VIDEO_OPENGL
	if (gl_oldmesa) {
		gl_active = InitOld(this, current);		
	} else {
		gl_active = InitNew(this, current);		
	}
#endif

	return (gl_active);
}

void SDL_AtariGL_Quit(_THIS, SDL_bool unload)
{
#if SDL_VIDEO_OPENGL
	if (gl_oldmesa) {
		/* Old mesa implementations */
		if (this->gl_data->OSMesaDestroyLDG) {
			this->gl_data->OSMesaDestroyLDG();
		}
		if (gl_shadow) {
			Mfree(gl_shadow);
			gl_shadow = NULL;
		}
	} else {
		/* New mesa implementation */
		if (gl_ctx) {
			if (this->gl_data->OSMesaDestroyContext) {
				this->gl_data->OSMesaDestroyContext(gl_ctx);
			}
			gl_ctx = NULL;
		}
	}

	if (unload) {
		SDL_AtariGL_UnloadLibrary(this);
	}

#endif /* SDL_VIDEO_OPENGL */
	gl_active = 0;
}

int SDL_AtariGL_LoadLibrary(_THIS, const char *path)
{
#if SDL_VIDEO_OPENGL

#if SDL_VIDEO_OPENGL_OSMESA_DYNAMIC
	void *handle;
	SDL_bool cancel_load;

	if (gl_active) {
		SDL_SetError("OpenGL context already created");
		return -1;
	}

	/* Unload previous driver */
	SDL_AtariGL_UnloadLibrary(this);

	/* Load library given by path */
	handle = SDL_LoadObject(path);
	if (handle == NULL) {
		/* Try to load another one */
		path = SDL_getenv("SDL_VIDEO_GL_DRIVER");
		if ( path != NULL ) {
			handle = SDL_LoadObject(path);
		}

		/* If it does not work, try some other */
		if (handle == NULL) {
			path = PATH_OSMESA_LDG;
			handle = SDL_LoadObject(path);
		}

		if (handle == NULL) {
			path = PATH_MESAGL_LDG;
			handle = SDL_LoadObject(path);
		}

		if (handle == NULL) {
			path = PATH_TINYGL_LDG;
			handle = SDL_LoadObject(path);
		}
	}

	if (handle == NULL) {
		SDL_SetError("Could not load OpenGL library");
		return -1;
	}

	this->gl_data->glGetIntegerv = SDL_LoadFunction(handle, "glGetIntegerv");
	this->gl_data->glFinish = SDL_LoadFunction(handle, "glFinish");
	this->gl_data->glFlush = SDL_LoadFunction(handle, "glFlush");

	cancel_load = SDL_FALSE;
	if (this->gl_data->glGetIntegerv == NULL) {
		cancel_load = SDL_TRUE;
	} else {
		/* We need either glFinish (OSMesa) or glFlush (TinyGL) */
		if ((this->gl_data->glFinish == NULL) &&
			(this->gl_data->glFlush == NULL)) {
				cancel_load = SDL_TRUE;
		}
	}
	if (cancel_load) {
		SDL_SetError("Could not retrieve OpenGL functions");
		SDL_UnloadObject(handle);
		/* Restore pointers to static library */
		SDL_AtariGL_InitPointers(this);
		return -1;
	}

	/* Load functions pointers (osmesa.ldg) */
	this->gl_data->OSMesaCreateContextExt = SDL_LoadFunction(handle, "OSMesaCreateContextExt");
	this->gl_data->OSMesaDestroyContext = SDL_LoadFunction(handle, "OSMesaDestroyContext");
	this->gl_data->OSMesaMakeCurrent = SDL_LoadFunction(handle, "OSMesaMakeCurrent");
	this->gl_data->OSMesaPixelStore = SDL_LoadFunction(handle, "OSMesaPixelStore");
	this->gl_data->OSMesaGetProcAddress = SDL_LoadFunction(handle, "OSMesaGetProcAddress");

	/* Load old functions pointers (mesa_gl.ldg, tiny_gl.ldg) */
	this->gl_data->OSMesaCreateLDG = SDL_LoadFunction(handle, "OSMesaCreateLDG");
	this->gl_data->OSMesaDestroyLDG = SDL_LoadFunction(handle, "OSMesaDestroyLDG");

	gl_oldmesa = 0;

	if ( (this->gl_data->OSMesaCreateContextExt == NULL) || 
	     (this->gl_data->OSMesaDestroyContext == NULL) ||
	     (this->gl_data->OSMesaMakeCurrent == NULL) ||
	     (this->gl_data->OSMesaPixelStore == NULL) ||
	     (this->gl_data->OSMesaGetProcAddress == NULL)) {
		/* Hum, maybe old library ? */
		if ( (this->gl_data->OSMesaCreateLDG == NULL) || 
		     (this->gl_data->OSMesaDestroyLDG == NULL)) {
			SDL_SetError("Could not retrieve OSMesa functions");
			SDL_UnloadObject(handle);
			/* Restore pointers to static library */
			SDL_AtariGL_InitPointers(this);
			return -1;
		} else {
			gl_oldmesa = 1;
		}
	}

	this->gl_config.dll_handle = handle;
	if ( path ) {
		SDL_strlcpy(this->gl_config.driver_path, path,
			SDL_arraysize(this->gl_config.driver_path));
	} else {
		*this->gl_config.driver_path = '\0';
	}

#endif
	this->gl_config.driver_loaded = 1;

	return 0;
#else
	return -1;
#endif
}

void *SDL_AtariGL_GetProcAddress(_THIS, const char *proc)
{
	void *func = NULL;
#if SDL_VIDEO_OPENGL

	if (this->gl_config.dll_handle) {
		func = SDL_LoadFunction(this->gl_config.dll_handle, (void *)proc);
	} else if (this->gl_data->OSMesaGetProcAddress) {
		func = this->gl_data->OSMesaGetProcAddress(proc);
	}

#endif
	return func;
}

int SDL_AtariGL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
{
#if SDL_VIDEO_OPENGL
	GLenum mesa_attrib;
	SDL_Surface *surface;

	if (!gl_active) {
		return -1;
	}

	switch(attrib) {
		case SDL_GL_RED_SIZE:
			mesa_attrib = GL_RED_BITS;
			break;
		case SDL_GL_GREEN_SIZE:
			mesa_attrib = GL_GREEN_BITS;
			break;
		case SDL_GL_BLUE_SIZE:
			mesa_attrib = GL_BLUE_BITS;
			break;
		case SDL_GL_ALPHA_SIZE:
			mesa_attrib = GL_ALPHA_BITS;
			break;
		case SDL_GL_DOUBLEBUFFER:
			surface = this->screen;
			*value = ((surface->flags & SDL_DOUBLEBUF)==SDL_DOUBLEBUF);
			return 0;
		case SDL_GL_DEPTH_SIZE:
			mesa_attrib = GL_DEPTH_BITS;
			break;
		case SDL_GL_STENCIL_SIZE:
			mesa_attrib = GL_STENCIL_BITS;
			break;
		case SDL_GL_ACCUM_RED_SIZE:
			mesa_attrib = GL_ACCUM_RED_BITS;
			break;
		case SDL_GL_ACCUM_GREEN_SIZE:
			mesa_attrib = GL_ACCUM_GREEN_BITS;
			break;
		case SDL_GL_ACCUM_BLUE_SIZE:
			mesa_attrib = GL_ACCUM_BLUE_BITS;
			break;
		case SDL_GL_ACCUM_ALPHA_SIZE:
			mesa_attrib = GL_ACCUM_ALPHA_BITS;
			break;
		default :
			return -1;
	}

	this->gl_data->glGetIntegerv(mesa_attrib, value);
	return 0;
#else
	return -1;
#endif
}

int SDL_AtariGL_MakeCurrent(_THIS)
{
#if SDL_VIDEO_OPENGL
	SDL_Surface *surface;
	GLenum type;

	if (gl_oldmesa && gl_active) {
		return 0;
	}

	if (this->gl_config.dll_handle) {
		if ((this->gl_data->OSMesaMakeCurrent == NULL) ||
			(this->gl_data->OSMesaPixelStore == NULL)) {
			return -1;
		}
	}

	if (!gl_active) {
		SDL_SetError("Invalid OpenGL context");
		return -1;
	}

	surface = this->screen;
	
	if ((surface->format->BitsPerPixel == 15) || (surface->format->BitsPerPixel == 16)) {
		type = GL_UNSIGNED_SHORT_5_6_5;
	} else {
		type = GL_UNSIGNED_BYTE;
	}

	if (!(this->gl_data->OSMesaMakeCurrent(gl_ctx, surface->pixels, type, surface->w, surface->h))) {
		SDL_SetError("Can not make OpenGL context current");
		return -1;
	}

	/* OSMesa draws upside down */
	this->gl_data->OSMesaPixelStore(OSMESA_Y_UP, 0);

	return 0;
#else
	return -1;
#endif
}

void SDL_AtariGL_SwapBuffers(_THIS)
{
#if SDL_VIDEO_OPENGL
	if (gl_active) {
		if (this->gl_config.dll_handle) {
			if (this->gl_data->glFinish) {
				this->gl_data->glFinish();
			} else if (this->gl_data->glFlush) {
				this->gl_data->glFlush();
			}
		} else {
			this->gl_data->glFinish();
		}
		gl_copyshadow(this, this->screen);
		gl_convert(this, this->screen);
	}
#endif
}

void SDL_AtariGL_InitPointers(_THIS)
{
#if SDL_VIDEO_OPENGL
	this->gl_data->OSMesaCreateContextExt = OSMesaCreateContextExt;
	this->gl_data->OSMesaDestroyContext = OSMesaDestroyContext;
	this->gl_data->OSMesaMakeCurrent = OSMesaMakeCurrent;
	this->gl_data->OSMesaPixelStore = OSMesaPixelStore;
	this->gl_data->OSMesaGetProcAddress = OSMesaGetProcAddress;

	this->gl_data->glGetIntegerv = glGetIntegerv;
	this->gl_data->glFinish = glFinish;
	this->gl_data->glFlush = glFlush;

	this->gl_data->OSMesaCreateLDG = NULL;
	this->gl_data->OSMesaDestroyLDG = NULL;
#endif
}

/*--- Private functions ---*/

static void SDL_AtariGL_UnloadLibrary(_THIS)
{
#if SDL_VIDEO_OPENGL
	if (this->gl_config.dll_handle) {
		SDL_UnloadObject(this->gl_config.dll_handle);
		this->gl_config.dll_handle = NULL;

		/* Restore pointers to static library */
		SDL_AtariGL_InitPointers(this);
	}
#endif
}

/*--- Creation of an OpenGL context using new/old functions ---*/

#if SDL_VIDEO_OPENGL
static int InitNew(_THIS, SDL_Surface *current)
{
	GLenum osmesa_format;
	SDL_PixelFormat *pixel_format;
	Uint32	redmask;
	int recreatecontext;
	GLint newaccumsize;

	if (this->gl_config.dll_handle) {
		if (this->gl_data->OSMesaCreateContextExt == NULL) {
			return 0;
		}
	}

	/* Init OpenGL context using OSMesa */
	gl_convert = ConvertNull;
	gl_copyshadow = CopyShadowNull;
	gl_upsidedown = SDL_FALSE;

	pixel_format = current->format;
	redmask = pixel_format->Rmask;
	switch (pixel_format->BitsPerPixel) {
		case 15:
			/* 1555, big and little endian, unsupported */
			gl_pixelsize = 2;
			osmesa_format = OSMESA_RGB_565;
			if (redmask == 31<<10) {
				gl_convert = Convert565To555be;
			} else {
				gl_convert = Convert565To555le;
			}
			break;
		case 16:
			gl_pixelsize = 2;
			if (redmask == 31<<11) {
				osmesa_format = OSMESA_RGB_565;
			} else {
				/* 565, little endian, unsupported */
				osmesa_format = OSMESA_RGB_565;
				gl_convert = Convert565le;
			}
			break;
		case 24:
			gl_pixelsize = 3;
			if (redmask == 255<<16) {
				osmesa_format = OSMESA_RGB;
			} else {
				osmesa_format = OSMESA_BGR;
			}
			break;
		case 32:
			gl_pixelsize = 4;
			if (redmask == 255<<16) {
				osmesa_format = OSMESA_ARGB;
			} else if (redmask == 255<<8) {
				osmesa_format = OSMESA_BGRA;
			} else if (redmask == 255<<24) {
				osmesa_format = OSMESA_RGBA;
			} else {
				/* ABGR format unsupported */
				osmesa_format = OSMESA_BGRA;
				gl_convert = ConvertBGRAToABGR;
			}
			break;
		default:
			gl_pixelsize = 1;
			osmesa_format = OSMESA_COLOR_INDEX;
			break;
	}

	/* Try to keep current context if possible */
	newaccumsize =
		this->gl_config.accum_red_size +
		this->gl_config.accum_green_size +
		this->gl_config.accum_blue_size +
		this->gl_config.accum_alpha_size;
	recreatecontext=1;
	if (gl_ctx &&
		(gl_curformat == osmesa_format) &&
		(gl_curdepth == this->gl_config.depth_size) &&
		(gl_curstencil == this->gl_config.stencil_size) &&
		(gl_curaccum == newaccumsize)) {
		recreatecontext = 0;
	}
	if (recreatecontext) {
		SDL_AtariGL_Quit(this, SDL_FALSE);

		gl_ctx = this->gl_data->OSMesaCreateContextExt(
			osmesa_format, this->gl_config.depth_size,
			this->gl_config.stencil_size, newaccumsize, NULL );

		if (gl_ctx) {
			gl_curformat = osmesa_format;
			gl_curdepth = this->gl_config.depth_size;
			gl_curstencil = this->gl_config.stencil_size;
			gl_curaccum = newaccumsize;
		} else {
			gl_curformat = 0;
			gl_curdepth = 0;
			gl_curstencil = 0;
			gl_curaccum = 0;
		}
	}

	return (gl_ctx != NULL);
}


static int InitOld(_THIS, SDL_Surface *current)
{
	GLenum osmesa_format;
	SDL_PixelFormat *pixel_format;
	Uint32	redmask;
	int recreatecontext, tinygl_present;

	if (this->gl_config.dll_handle) {
		if (this->gl_data->OSMesaCreateLDG == NULL) {
			return 0;
		}
	}

	/* TinyGL only supports VDI_RGB (OSMESA_RGB) */
	tinygl_present=0;
	if (this->gl_config.dll_handle) {
		if (this->gl_data->glFinish == NULL) {
			tinygl_present=1;
		}
	}

	/* Init OpenGL context using OSMesa */
	gl_convert = ConvertNull;
	gl_copyshadow = CopyShadowNull;
	gl_upsidedown = SDL_FALSE;

	pixel_format = current->format;
	redmask = pixel_format->Rmask;
	switch (pixel_format->BitsPerPixel) {
		case 15:
			/* 15 bits unsupported */
			if (tinygl_present) {
				gl_pixelsize = 3;
				osmesa_format = VDI_RGB;
				if (redmask == 31<<10) {
					gl_copyshadow = CopyShadowRGBTo555;
				} else {
					gl_copyshadow = CopyShadowRGBTo565;
					gl_convert = Convert565To555le;
				}
			} else {
				gl_pixelsize = 4;
				gl_upsidedown = SDL_TRUE;
				osmesa_format = OSMESA_ARGB;
				if (redmask == 31<<10) {
					gl_copyshadow = CopyShadow8888To555;
				} else {
					gl_copyshadow = CopyShadow8888To565;
					gl_convert = Convert565To555le;
				}
			}
			break;
		case 16:
			/* 16 bits unsupported */
			if (tinygl_present) {
				gl_pixelsize = 3;
				osmesa_format = VDI_RGB;
				gl_copyshadow = CopyShadowRGBTo565;
				if (redmask != 31<<11) {
					/* 565, little endian, unsupported */
					gl_convert = Convert565le;
				}
			} else {
				gl_pixelsize = 4;
				gl_upsidedown = SDL_TRUE;
				osmesa_format = OSMESA_ARGB;
				gl_copyshadow = CopyShadow8888To565;
				if (redmask != 31<<11) {
					/* 565, little endian, unsupported */
					gl_convert = Convert565le;
				}
			}
			break;
		case 24:
			gl_pixelsize = 3;
			if (tinygl_present) {
				osmesa_format = VDI_RGB;
				gl_copyshadow = CopyShadowDirect;
				if (redmask != 255<<16) {
					gl_copyshadow = CopyShadowRGBSwap;
				}
			} else {
				gl_copyshadow = CopyShadowDirect;
				gl_upsidedown = SDL_TRUE;
				if (redmask == 255<<16) {
					osmesa_format = OSMESA_RGB;
				} else {
					osmesa_format = OSMESA_BGR;
				}
			}
			break;
		case 32:
			if (tinygl_present) {
				gl_pixelsize = 3;
				osmesa_format = VDI_RGB;
				gl_copyshadow = CopyShadowRGBToARGB;
				if (redmask == 255) {
					gl_convert = CopyShadowRGBToABGR;
				} else if (redmask == 255<<8) {
					gl_convert = CopyShadowRGBToBGRA;
				} else if (redmask == 255<<24) {
					gl_convert = CopyShadowRGBToRGBA;
				}
			} else {
				gl_pixelsize = 4;
				gl_upsidedown = SDL_TRUE;
				gl_copyshadow = CopyShadowDirect;
				if (redmask == 255<<16) {
					osmesa_format = OSMESA_ARGB;
				} else if (redmask == 255<<8) {
					osmesa_format = OSMESA_BGRA;
				} else if (redmask == 255<<24) {
					osmesa_format = OSMESA_RGBA;
				} else {
					/* ABGR format unsupported */
					osmesa_format = OSMESA_BGRA;
					gl_convert = ConvertBGRAToABGR;
				}
			}
			break;
		default:
			if (tinygl_present) {
				SDL_AtariGL_Quit(this, SDL_FALSE);
				return 0;
			}
			gl_pixelsize = 1;
			gl_copyshadow = CopyShadowDirect;
			osmesa_format = OSMESA_COLOR_INDEX;
			break;
	}

	/* Try to keep current context if possible */
	recreatecontext=1;
	if (gl_shadow &&
		(gl_curformat == osmesa_format) &&
		(gl_curwidth == current->w) &&
		(gl_curheight == current->h)) {
		recreatecontext = 0;
	}
	if (recreatecontext) {
		SDL_AtariGL_Quit(this, SDL_FALSE);

		gl_shadow = this->gl_data->OSMesaCreateLDG(
			osmesa_format, GL_UNSIGNED_BYTE, current->w, current->h
		);

		if (gl_shadow) {
			gl_curformat = osmesa_format;
			gl_curwidth = current->w;
			gl_curheight = current->h;
		} else {
			gl_curformat = 0;
			gl_curwidth = 0;
			gl_curheight = 0;
		}
	}

	return (gl_shadow != NULL);
}

/*--- Conversions routines from shadow buffer to the screen ---*/

static void CopyShadowNull(_THIS, SDL_Surface *surface)
{
}

static void CopyShadowDirect(_THIS, SDL_Surface *surface)
{
	int y, srcpitch, dstpitch;
	Uint8 *srcline, *dstline;

	srcline = gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		SDL_memcpy(dstline, srcline, srcpitch);

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBTo555(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint16 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>1;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;
		for (x=0; x<surface->w; x++) {
			Uint16 dstcolor;
			
			dstcolor = ((*srccol++)<<7) & (31<<10);
			dstcolor |= ((*srccol++)<<2) & (31<<5);
			dstcolor |= ((*srccol++)>>3) & 31;
			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBTo565(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint16 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>1;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			Uint16 dstcolor;
			
			dstcolor = ((*srccol++)<<8) & (31<<11);
			dstcolor |= ((*srccol++)<<3) & (63<<5);
			dstcolor |= ((*srccol++)>>3) & 31;
			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBSwap(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint8 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			*dstcol++ = srccol[2];
			*dstcol++ = srccol[1];
			*dstcol++ = srccol[0];
			srccol += 3;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBToARGB(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint32 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>2;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			Uint32	dstcolor;

			dstcolor = (*srccol++)<<16;
			dstcolor |= (*srccol++)<<8;
			dstcolor |= *srccol++;

			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBToABGR(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint32 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>2;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			Uint32	dstcolor;

			dstcolor = *srccol++;
			dstcolor |= (*srccol++)<<8;
			dstcolor |= (*srccol++)<<16;

			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBToBGRA(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint32 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>2;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			Uint32	dstcolor;

			dstcolor = (*srccol++)<<8;
			dstcolor |= (*srccol++)<<16;
			dstcolor |= (*srccol++)<<24;

			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadowRGBToRGBA(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint32 *dstline, *dstcol;
	Uint8 *srcline, *srccol;

	srcline = (Uint8 *)gl_shadow;
	srcpitch = surface->w * gl_pixelsize;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>2;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			Uint32	dstcolor;

			dstcolor = (*srccol++)<<24;
			dstcolor |= (*srccol++)<<16;
			dstcolor |= (*srccol++)<<8;

			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadow8888To555(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint16 *dstline, *dstcol;
	Uint32 *srcline, *srccol;

	srcline = (Uint32 *)gl_shadow;
	srcpitch = (surface->w * gl_pixelsize) >>2;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>1;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;
		for (x=0; x<surface->w; x++) {
			Uint32 srccolor;
			Uint16 dstcolor;
			
			srccolor = *srccol++;
			dstcolor = (srccolor>>9) & (31<<10);
			dstcolor |= (srccolor>>6) & (31<<5);
			dstcolor |= (srccolor>>3) & 31;
			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

static void CopyShadow8888To565(_THIS, SDL_Surface *surface)
{
	int x,y, srcpitch, dstpitch;
	Uint16 *dstline, *dstcol;
	Uint32 *srcline, *srccol;

	srcline = (Uint32 *)gl_shadow;
	srcpitch = (surface->w * gl_pixelsize) >> 2;
	dstline = surface->pixels;
	dstpitch = surface->pitch >>1;
	if (gl_upsidedown) {
		srcline += (surface->h-1)*srcpitch;
		srcpitch = -srcpitch;
	}

	for (y=0; y<surface->h; y++) {
		srccol = srcline;
		dstcol = dstline;

		for (x=0; x<surface->w; x++) {
			Uint32 srccolor;
			Uint16 dstcolor;
			
			srccolor = *srccol++;
			dstcolor = (srccolor>>8) & (31<<11);
			dstcolor |= (srccolor>>5) & (63<<5);
			dstcolor |= (srccolor>>3) & 31;
			*dstcol++ = dstcolor;
		}

		srcline += srcpitch;
		dstline += dstpitch;
	}
}

/*--- Conversions routines in the screen ---*/

static void ConvertNull(_THIS, SDL_Surface *surface)
{
}

static void Convert565To555be(_THIS, SDL_Surface *surface)
{
	int x,y, pitch;
	unsigned short *line, *pixel;

	line = surface->pixels;
	pitch = surface->pitch >> 1;
	for (y=0; y<surface->h; y++) {
		pixel = line;
		for (x=0; x<surface->w; x++) {
			unsigned short color = *pixel;

			*pixel++ = (color & 0x1f)|((color>>1) & 0xffe0);
		}

		line += pitch;
	}
}

static void Convert565To555le(_THIS, SDL_Surface *surface)
{
	int x,y, pitch;
	unsigned short *line, *pixel;

	line = surface->pixels;
	pitch = surface->pitch >>1;
	for (y=0; y<surface->h; y++) {
		pixel = line;
		for (x=0; x<surface->w; x++) {
			unsigned short color = *pixel;

			color = (color & 0x1f)|((color>>1) & 0xffe0);
			*pixel++ = SDL_Swap16(color);
		}

		line += pitch;
	}
}

static void Convert565le(_THIS, SDL_Surface *surface)
{
	int x,y, pitch;
	unsigned short *line, *pixel;

	line = surface->pixels;
	pitch = surface->pitch >>1;
	for (y=0; y<surface->h; y++) {
		pixel = line;
		for (x=0; x<surface->w; x++) {
			unsigned short color = *pixel;

			*pixel++ = SDL_Swap16(color);
		}

		line += pitch;
	}
}

static void ConvertBGRAToABGR(_THIS, SDL_Surface *surface)
{
	int x,y, pitch;
	unsigned long *line, *pixel;

	line = surface->pixels;
	pitch = surface->pitch >>2;
	for (y=0; y<surface->h; y++) {
		pixel = line;
		for (x=0; x<surface->w; x++) {
			unsigned long color = *pixel;

			*pixel++ = (color<<24)|(color>>8);
		}

		line += pitch;
	}
}

#endif /* SDL_VIDEO_OPENGL */