/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 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

*/

/* SVGAlib based SDL video driver implementation.

*/

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#if defined(linux)

#include <linux/vt.h>

#elif defined(__FreeBSD__)

#include <sys/consio.h>

#else

#error You must choose your operating system here

#endif

#include <vga.h>

#include <vgamouse.h>

#include <vgakeyboard.h>

#include "SDL.h"

#include "SDL_error.h"

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_events_c.h"

#include "SDL_svgavideo.h"

#include "SDL_svgaevents_c.h"

#include "SDL_svgamouse_c.h"

/* Initialization/Query functions */

static int SVGA_VideoInit(_THIS, SDL_PixelFormat *vformat);

static SDL_Rect **SVGA_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

static SDL_Surface *SVGA_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

static int SVGA_SetColors(_THIS, int firstcolor, int ncolors,

SDL_Color *colors);

static void SVGA_VideoQuit(_THIS);

/* Hardware surface functions */

static int SVGA_AllocHWSurface(_THIS, SDL_Surface *surface);

static int SVGA_LockHWSurface(_THIS, SDL_Surface *surface);

static int SVGA_FlipHWSurface(_THIS, SDL_Surface *surface);

static void SVGA_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void SVGA_FreeHWSurface(_THIS, SDL_Surface *surface);

/* SVGAlib driver bootstrap functions */

static int SVGA_Available(void)

{

/* Check to see if we are root and stdin is a virtual console */

int console;

/* SVGALib 1.9.x+ doesn't require root (via /dev/svga) */

int svgalib2 = -1;

/* See if we are connected to a virtual terminal */

console = STDIN_FILENO;

#if 0 /* This is no longer needed, SVGAlib can switch consoles for us */

if ( console >= 0 ) {

struct stat sb;

struct vt_mode dummy;

if ( (fstat(console, &sb) < 0) ||

(ioctl(console, VT_GETMODE, &dummy) < 0) ) {

console = -1;

}

}

#endif /* 0 */

/* See if SVGAlib 2.0 is available */

svgalib2 = open("/dev/svga", O_RDONLY);

if (svgalib2 != -1) {

close(svgalib2);

}

return(((svgalib2 != -1) || (geteuid() == 0)) && (console >= 0));

}

static void SVGA_DeleteDevice(SDL_VideoDevice *device)

{

SDL_free(device->hidden);

SDL_free(device);

}

static SDL_VideoDevice *SVGA_CreateDevice(int devindex)

{

SDL_VideoDevice *device;

/* Initialize all variables that we clean on shutdown */

device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));

if ( device ) {

SDL_memset(device, 0, (sizeof *device));

device->hidden = (struct SDL_PrivateVideoData *)

SDL_malloc((sizeof *device->hidden));

}

if ( (device == NULL) || (device->hidden == NULL) ) {

SDL_OutOfMemory();

if ( device ) {

SDL_free(device);

}

return(0);

}

SDL_memset(device->hidden, 0, (sizeof *device->hidden));

/* Set the function pointers */

device->VideoInit = SVGA_VideoInit;

device->ListModes = SVGA_ListModes;

device->SetVideoMode = SVGA_SetVideoMode;

device->SetColors = SVGA_SetColors;

device->UpdateRects = NULL;

device->VideoQuit = SVGA_VideoQuit;

device->AllocHWSurface = SVGA_AllocHWSurface;

device->CheckHWBlit = NULL;

device->FillHWRect = NULL;

device->SetHWColorKey = NULL;

device->SetHWAlpha = NULL;

device->LockHWSurface = SVGA_LockHWSurface;

device->UnlockHWSurface = SVGA_UnlockHWSurface;

device->FlipHWSurface = SVGA_FlipHWSurface;

device->FreeHWSurface = SVGA_FreeHWSurface;

device->SetCaption = NULL;

device->SetIcon = NULL;

device->IconifyWindow = NULL;

device->GrabInput = NULL;

device->GetWMInfo = NULL;

device->InitOSKeymap = SVGA_InitOSKeymap;

device->PumpEvents = SVGA_PumpEvents;

device->free = SVGA_DeleteDevice;

return device;

}

VideoBootStrap SVGALIB_bootstrap = {

"svgalib", "SVGAlib",

SVGA_Available, SVGA_CreateDevice

};

static int SVGA_AddMode(_THIS, int mode, int actually_add, int force)

{

vga_modeinfo *modeinfo;

modeinfo = vga_getmodeinfo(mode);

if ( force || ( modeinfo->flags & CAPABLE_LINEAR ) ) {

int i, j;

i = modeinfo->bytesperpixel-1;

if ( actually_add ) {

SDL_Rect saved_rect[2];

int saved_mode[2];

int b;

/* Add the mode, sorted largest to smallest */

b = 0;

j = 0;

while ( (SDL_modelist[i][j]->w > modeinfo->width) ||

(SDL_modelist[i][j]->h > modeinfo->height) ) {

++j;

}

/* Skip modes that are already in our list */

if ( (SDL_modelist[i][j]->w == modeinfo->width) &&

(SDL_modelist[i][j]->h == modeinfo->height) ) {

return(0);

}

/* Insert the new mode */

saved_rect[b] = *SDL_modelist[i][j];

saved_mode[b] = SDL_vgamode[i][j];

SDL_modelist[i][j]->w = modeinfo->width;

SDL_modelist[i][j]->h = modeinfo->height;

SDL_vgamode[i][j] = mode;

/* Everybody scoot down! */

if ( saved_rect[b].w && saved_rect[b].h ) {

for ( ++j; SDL_modelist[i][j]->w; ++j ) {

saved_rect[!b] = *SDL_modelist[i][j];

saved_mode[!b] = SDL_vgamode[i][j];

*SDL_modelist[i][j] = saved_rect[b];

SDL_vgamode[i][j] = saved_mode[b];

b = !b;

}

*SDL_modelist[i][j] = saved_rect[b];

SDL_vgamode[i][j] = saved_mode[b];

}

} else {

++SDL_nummodes[i];

}

}

return( force || ( modeinfo->flags & CAPABLE_LINEAR ) );

}

static void SVGA_UpdateVideoInfo(_THIS)

{

vga_modeinfo *modeinfo;

this->info.wm_available = 0;

this->info.hw_available = 1;

modeinfo = vga_getmodeinfo(vga_getcurrentmode());

this->info.video_mem = modeinfo->memory;

/* FIXME: Add hardware accelerated blit information */

#ifdef SVGALIB_DEBUG

printf("Hardware accelerated blit: %savailable\n", modeinfo->haveblit ? "" : "not ");

#endif

}

int SVGA_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

int keyboard;

int i, j;

int mode, total_modes;

/* Initialize all variables that we clean on shutdown */

for ( i=0; i<NUM_MODELISTS; ++i ) {

SDL_nummodes[i] = 0;

SDL_modelist[i] = NULL;

SDL_vgamode[i] = NULL;

}

/* Initialize the library */

vga_disabledriverreport();

if ( vga_init() < 0 ) {

SDL_SetError("Unable to initialize SVGAlib");

return(-1);

}

vga_setmode(TEXT);

/* Enable mouse and keyboard support */

vga_setmousesupport(1);

keyboard = keyboard_init_return_fd();

if ( keyboard < 0 ) {

SDL_SetError("Unable to initialize keyboard");

return(-1);

}

if ( SVGA_initkeymaps(keyboard) < 0 ) {

return(-1);

}

keyboard_seteventhandler(SVGA_keyboardcallback);

/* Determine the screen depth (use default 8-bit depth) */

vformat->BitsPerPixel = 8;

/* Enumerate the available fullscreen modes */

total_modes = 0;

for ( mode=vga_lastmodenumber(); mode; --mode ) {

if ( vga_hasmode(mode) ) {

if ( SVGA_AddMode(this, mode, 0, 0) ) {

++total_modes;

}

}

}

if ( SVGA_AddMode(this, G320x200x256, 0, 1) ) ++total_modes;

if ( total_modes == 0 ) {

SDL_SetError("No linear video modes available");

return(-1);

}

for ( i=0; i<NUM_MODELISTS; ++i ) {

SDL_vgamode[i] = (int *)SDL_malloc(SDL_nummodes[i]*sizeof(int));

if ( SDL_vgamode[i] == NULL ) {

SDL_OutOfMemory();

return(-1);

}

SDL_modelist[i] = (SDL_Rect **)

SDL_malloc((SDL_nummodes[i]+1)*sizeof(SDL_Rect *));

if ( SDL_modelist[i] == NULL ) {

SDL_OutOfMemory();

return(-1);

}

for ( j=0; j<SDL_nummodes[i]; ++j ) {

SDL_modelist[i][j]=(SDL_Rect *)SDL_malloc(sizeof(SDL_Rect));

if ( SDL_modelist[i][j] == NULL ) {

SDL_OutOfMemory();

return(-1);

}

SDL_memset(SDL_modelist[i][j], 0, sizeof(SDL_Rect));

}

SDL_modelist[i][j] = NULL;

}

for ( mode=vga_lastmodenumber(); mode; --mode ) {

if ( vga_hasmode(mode) ) {

SVGA_AddMode(this, mode, 1, 0);

}

}

SVGA_AddMode(this, G320x200x256, 1, 1);

/* Free extra (duplicated) modes */

for ( i=0; i<NUM_MODELISTS; ++i ) {

j = 0;

while ( SDL_modelist[i][j] && SDL_modelist[i][j]->w ) {

j++;

}

while ( SDL_modelist[i][j] ) {

SDL_free(SDL_modelist[i][j]);

SDL_modelist[i][j] = NULL;

j++;

}

}

/* Fill in our hardware acceleration capabilities */

SVGA_UpdateVideoInfo(this);

/* We're done! */

return(0);

}

SDL_Rect **SVGA_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

return(SDL_modelist[((format->BitsPerPixel+7)/8)-1]);

}

/* Various screen update functions available */

static void SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);

static void SVGA_BankedUpdate(_THIS, int numrects, SDL_Rect *rects);

SDL_Surface *SVGA_SetVideoMode(_THIS, SDL_Surface *current,

int width, int height, int bpp, Uint32 flags)

{

int mode;

int vgamode;

vga_modeinfo *modeinfo;

int screenpage_len;

/* Try to set the requested linear video mode */

bpp = (bpp+7)/8-1;

for ( mode=0; SDL_modelist[bpp][mode]; ++mode ) {

if ( (SDL_modelist[bpp][mode]->w == width) &&

(SDL_modelist[bpp][mode]->h == height) ) {

break;

}

}

if ( SDL_modelist[bpp][mode] == NULL ) {

SDL_SetError("Couldn't find requested mode in list");

return(NULL);

}

vga_setmode(SDL_vgamode[bpp][mode]);

vga_setpage(0);

vgamode=SDL_vgamode[bpp][mode];

if ((vga_setlinearaddressing()<0) && (vgamode!=G320x200x256)) {

SDL_SetError("Unable to set linear addressing");

return(NULL);

}

modeinfo = vga_getmodeinfo(SDL_vgamode[bpp][mode]);

/* Update hardware acceleration info */

SVGA_UpdateVideoInfo(this);

/* Allocate the new pixel format for the screen */

bpp = (bpp+1)*8;

if ( (bpp == 16) && (modeinfo->colors == 32768) ) {

bpp = 15;

}

if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {

return(NULL);

}

/* Set up the new mode framebuffer */

current->flags = (SDL_FULLSCREEN|SDL_HWSURFACE);

if ( bpp == 8 ) {

/* FIXME: What about DirectColor? */

current->flags |= SDL_HWPALETTE;

}

current->w = width;

current->h = height;

current->pitch = modeinfo->linewidth;

current->pixels = vga_getgraphmem();

/* set double-buffering */

if ( flags & SDL_DOUBLEBUF )

{

/* length of one screen page in bytes */

screenpage_len=current->h*modeinfo->linewidth;

/* if start address should be aligned */

if ( modeinfo->linewidth_unit )

{

if ( screenpage_len % modeinfo->linewidth_unit )

{

screenpage_len += modeinfo->linewidth_unit - ( screenpage_len % modeinfo->linewidth_unit );

}

}

/* if we heve enough videomemory = ak je dost videopamete */

if ( modeinfo->memory > ( screenpage_len * 2 / 1024 ) )

{

current->flags |= SDL_DOUBLEBUF;

flip_page = 0;

flip_offset[0] = 0;

flip_offset[1] = screenpage_len;

flip_address[0] = vga_getgraphmem();

flip_address[1] = flip_address[0]+screenpage_len;

SVGA_FlipHWSurface(this,current);

}

}

/* Set the blit function */

this->UpdateRects = SVGA_DirectUpdate;

/* Set up the mouse handler again (buggy SVGAlib 1.40) */

mouse_seteventhandler(SVGA_mousecallback);

/* We're done */

return(current);

}

/* We don't actually allow hardware surfaces other than the main one */

static int SVGA_AllocHWSurface(_THIS, SDL_Surface *surface)

{

return(-1);

}

static void SVGA_FreeHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

/* We need to wait for vertical retrace on page flipped displays */

static int SVGA_LockHWSurface(_THIS, SDL_Surface *surface)

{

/* The waiting is done in SVGA_FlipHWSurface() */

return(0);

}

static void SVGA_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

static int SVGA_FlipHWSurface(_THIS, SDL_Surface *surface)

{

vga_setdisplaystart(flip_offset[flip_page]);

flip_page=!flip_page;

surface->pixels=flip_address[flip_page];

vga_waitretrace();

return(0);

}

static void SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)

{

return;

}

/* FIXME: Can this be used under SVGAlib? */

static void SVGA_BankedUpdate(_THIS, int numrects, SDL_Rect *rects)

{

return;

}

int SVGA_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

{

int i;

for(i = 0; i < ncolors; i++) {

vga_setpalette(firstcolor + i,

colors[i].r>>2,

colors[i].g>>2,

colors[i].b>>2);

}

return(1);

}

/* Note: If we are terminated, this could be called in the middle of

another SDL video routine -- notably UpdateRects.

*/

void SVGA_VideoQuit(_THIS)

{

int i, j;

/* Reset the console video mode */

if ( this->screen && (this->screen->w && this->screen->h) ) {

vga_setmode(TEXT);

}

keyboard_close();

/* Free video mode lists */

for ( i=0; i<NUM_MODELISTS; ++i ) {

if ( SDL_modelist[i] != NULL ) {

for ( j=0; SDL_modelist[i][j]; ++j )

SDL_free(SDL_modelist[i][j]);

SDL_free(SDL_modelist[i]);

SDL_modelist[i] = NULL;

}

if ( SDL_vgamode[i] != NULL ) {

SDL_free(SDL_vgamode[i]);

SDL_vgamode[i] = NULL;

}

}

if ( this->screen && (this->screen->flags & SDL_HWSURFACE) ) {

/* Direct screen access, no memory buffer */

this->screen->pixels = NULL;

}

}