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SDL_svgavideo.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* SVGAlib based SDL video driver implementation.
*/
#include <unistd.h>
#include <sys/stat.h>
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#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
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#if defined(__LINUX__)
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#include <linux/vt.h>
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#elif defined(__FREEBSD__)
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#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_video.h"
#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../../events/SDL_events_c.h"
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#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;
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/* SVGALib 1.9.x+ doesn't require root (via /dev/svga) */
int svgalib2 = -1;
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/* See if we are connected to a virtual terminal */
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console = STDIN_FILENO;
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#if 0 /* This is no longer needed, SVGAlib can switch consoles for us */
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if ( console >= 0 ) {
struct stat sb;
struct vt_mode dummy;
if ( (fstat(console, &sb) < 0) ||
(ioctl(console, VT_GETMODE, &dummy) < 0) ) {
console = -1;
}
}
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#endif /* 0 */
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/* 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));
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}
static void SVGA_DeleteDevice(SDL_VideoDevice *device)
{
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SDL_free(device->hidden);
SDL_free(device);
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}
static SDL_VideoDevice *SVGA_CreateDevice(int devindex)
{
SDL_VideoDevice *device;
/* Initialize all variables that we clean on shutdown */
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device = (SDL_VideoDevice *)SDL_malloc(sizeof(SDL_VideoDevice));
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if ( device ) {
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SDL_memset(device, 0, (sizeof *device));
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device->hidden = (struct SDL_PrivateVideoData *)
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SDL_malloc((sizeof *device->hidden));
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}
if ( (device == NULL) || (device->hidden == NULL) ) {
SDL_OutOfMemory();
if ( device ) {
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SDL_free(device);
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}
return(0);
}
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SDL_memset(device->hidden, 0, (sizeof *device->hidden));
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/* 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;
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device->FlipHWSurface = SVGA_FlipHWSurface;
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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
};
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static int SVGA_AddMode(_THIS, int mode, int actually_add)
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{
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int i, j;
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vga_modeinfo *modeinfo;
modeinfo = vga_getmodeinfo(mode);
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i = modeinfo->bytesperpixel-1;
if ( i < 0 ) {
return 0;
}
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;
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/* 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];
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}
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} else {
++SDL_nummodes[i];
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}
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return(1);
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}
static void SVGA_UpdateVideoInfo(_THIS)
{
vga_modeinfo *modeinfo;
this->info.wm_available = 0;
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this->info.hw_available = (banked ? 0 : 1);
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modeinfo = vga_getmodeinfo(vga_getcurrentmode());
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this->info.video_mem = modeinfo->memory;
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/* FIXME: Add hardware accelerated blit information */
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#ifdef SVGALIB_DEBUG
printf("Hardware accelerated blit: %savailable\n", modeinfo->haveblit ? "" : "not ");
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#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);
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/* Determine the current screen size */
this->info.current_w = 0;
this->info.current_h = 0;
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/* 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) ) {
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if ( SVGA_AddMode(this, mode, 0) ) {
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++total_modes;
}
}
}
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if ( SVGA_AddMode(this, G320x200x256, 0) ) ++total_modes;
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if ( total_modes == 0 ) {
SDL_SetError("No linear video modes available");
return(-1);
}
for ( i=0; i<NUM_MODELISTS; ++i ) {
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SDL_vgamode[i] = (int *)SDL_malloc(SDL_nummodes[i]*sizeof(int));
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if ( SDL_vgamode[i] == NULL ) {
SDL_OutOfMemory();
return(-1);
}
SDL_modelist[i] = (SDL_Rect **)
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SDL_malloc((SDL_nummodes[i]+1)*sizeof(SDL_Rect *));
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if ( SDL_modelist[i] == NULL ) {
SDL_OutOfMemory();
return(-1);
}
for ( j=0; j<SDL_nummodes[i]; ++j ) {
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SDL_modelist[i][j]=(SDL_Rect *)SDL_malloc(sizeof(SDL_Rect));
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if ( SDL_modelist[i][j] == NULL ) {
SDL_OutOfMemory();
return(-1);
}
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SDL_memset(SDL_modelist[i][j], 0, sizeof(SDL_Rect));
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}
SDL_modelist[i][j] = NULL;
}
for ( mode=vga_lastmodenumber(); mode; --mode ) {
if ( vga_hasmode(mode) ) {
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SVGA_AddMode(this, mode, 1);
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}
}
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SVGA_AddMode(this, G320x200x256, 1);
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/* 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] ) {
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SDL_free(SDL_modelist[i][j]);
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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;
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int screenpage_len;
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/* Free old pixels if we were in banked mode */
if ( banked && current->pixels ) {
free(current->pixels);
current->pixels = NULL;
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/* 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);
}
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vgamode = SDL_vgamode[bpp][mode];
vga_setmode(vgamode);
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vga_setpage(0);
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if ( (vga_setlinearaddressing() < 0) && (vgamode != G320x200x256) ) {
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banked = 1;
} else {
banked = 0;
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}
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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 */
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current->flags = SDL_FULLSCREEN;
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if ( !banked ) {
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current->flags |= SDL_HWSURFACE;
}
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if ( bpp == 8 ) {
/* FIXME: What about DirectColor? */
current->flags |= SDL_HWPALETTE;
}
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current->w = width;
current->h = height;
current->pitch = modeinfo->linewidth;
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if ( banked ) {
current->pixels = SDL_malloc(current->h * current->pitch);
if ( !current->pixels ) {
SDL_OutOfMemory();
return(NULL);
}
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} else {
current->pixels = vga_getgraphmem();
}
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/* set double-buffering */
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if ( (flags & SDL_DOUBLEBUF) && !banked )
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{
/* 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);
}
}
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/* Set the blit function */
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if ( banked ) {
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this->UpdateRects = SVGA_BankedUpdate;
} else {
this->UpdateRects = SVGA_DirectUpdate;
}
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/* 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)
{
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/* The waiting is done in SVGA_FlipHWSurface() */
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return(0);
}
static void SVGA_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
return;
}
static int SVGA_FlipHWSurface(_THIS, SDL_Surface *surface)
{
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if ( !banked ) {
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vga_setdisplaystart(flip_offset[flip_page]);
flip_page=!flip_page;
surface->pixels=flip_address[flip_page];
vga_waitretrace();
}
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return(0);
}
static void SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)
{
return;
}
static void SVGA_BankedUpdate(_THIS, int numrects, SDL_Rect *rects)
{
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int i, j;
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SDL_Rect *rect;
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int page, vp;
int x, y, w, h;
unsigned char *src;
unsigned char *dst;
int bpp = this->screen->format->BytesPerPixel;
int pitch = this->screen->pitch;
dst = vga_getgraphmem();
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for ( i=0; i < numrects; ++i ) {
rect = &rects[i];
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x = rect->x;
y = rect->y;
w = rect->w * bpp;
h = rect->h;
vp = y * pitch + x * bpp;
src = (unsigned char *)this->screen->pixels + vp;
page = vp >> 16;
vp &= 0xffff;
vga_setpage(page);
for (j = 0; j < h; j++) {
if (vp + w > 0x10000) {
if (vp >= 0x10000) {
page++;
vga_setpage(page);
vp &= 0xffff;
} else {
SDL_memcpy(dst + vp, src, 0x10000 - vp);
page++;
vga_setpage(page);
SDL_memcpy(dst, src + 0x10000 - vp,
(vp + w) & 0xffff);
vp = (vp + pitch) & 0xffff;
src += pitch;
continue;
}
}
SDL_memcpy(dst + vp, src, w);
src += pitch;
vp += pitch;
}
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}
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 )
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SDL_free(SDL_modelist[i][j]);
SDL_free(SDL_modelist[i]);
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SDL_modelist[i] = NULL;
}
if ( SDL_vgamode[i] != NULL ) {
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SDL_free(SDL_vgamode[i]);
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SDL_vgamode[i] = NULL;
}
}
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if ( this->screen ) {
if ( banked && this->screen->pixels ) {
SDL_free(this->screen->pixels);
}
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this->screen->pixels = NULL;
}
}