/*

SDL - Simple DirectMedia Layer

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

/*

26 March 2003

File includes routines for:

Setting up as a WIMP Task

Reading information about the current desktop

Storing information before a switch to full screen

Restoring desktop after switching to full screen

*/

#include "kernel.h"

#include "swis.h"

#include "SDL_riscostask.h"

#include <pthread.h>

pthread_t main_thread;

#endif

static int task_handle = 0;

static int wimp_version = 0;

/* RISC OS variables to help compatability with certain programs */

int riscos_backbuffer = 0; /* Create a back buffer in system memory for full screen mode */

int riscos_closeaction = 1; /* Close icon action */

/* Local function */

/* Uncomment next line to copy mode changes/restores to stderr */

/* #define DUMP_MODE */

#ifdef DUMP_MODE

#include "stdio.h"

static void

dump_mode ()

fprintf (stderr, "mode %d\n", stored_mode);

if (stored_mode < -1 || stored_mode >= 256) {

while (blockSize < 5 || storeBlock[blockSize] != -1) {

fprintf (stderr, " %d\n", storeBlock[blockSize++]);

}

}

}

#endif

/******************************************************************

*******************************************************************/

int

RISCOS_InitTask ()

char task_name[32];

_kernel_swi_regs regs;

int messages[4];

if (RISCOS_GetTaskName (task_name, SDL_arraysize (task_name)) == 0)

return 0;

messages[0] = 9; /* Palette changed */

messages[1] = 0x400c1; /* Mode changed */

messages[2] = 8; /* Pre quit */

messages[2] = 0;

regs.r[0] = (unsigned int) 360; /* Minimum version 3.6 */

regs.r[1] = (unsigned int) 0x4b534154;

regs.r[2] = (unsigned int) task_name;

regs.r[3] = (unsigned int) messages;

if (_kernel_swi (Wimp_Initialise, &regs, &regs) == 0) {

wimp_version = regs.r[0];

task_handle = regs.r[1];

return 1;

}

#endif

}

/*********************************************************************

Close down application on exit.

**********************************************************************/

void

RISCOS_ExitTask ()

if (stored_mode == -1) {

/* Ensure cursor is put back to standard pointer shape if

we have been running in a window */

_kernel_osbyte (106, 1, 0);

}

/* Ensure we end up back in the wimp */

RISCOS_RestoreWimpMode ();

/* Neatly exit the task */

regs.r[0] = task_handle;

regs.r[1] = (unsigned int) 0x4b534154;

_kernel_swi (Wimp_CloseDown, &regs, &regs);

task_handle = 0;

}

/**************************************************************************

Get the name of the task for the desktop.

Param: task_name - name of task 32 characters.

Returns: 1 is successful, otherwise 0

Notes: Works by getting using OS_GetEnv to get the command line

used to run the program and then parsing a name from it

as follows.

1. Use name after final period if not !RunImage

2. If name is !RunImage then process item before the period

in front of !RunImage.

3. If directory name use that

4. if in form <XXX$Dir> use the XXX.

Finally once this value has been retrieved use it unless

there is a variable set up in the form SDL$<name>$TaskName

in which case the value of this variable will be used.

SDL$<name>$BackBuffer - set to 1 to use a system memory backbuffer in fullscreen mode

so updates wait until a call to SDL_UpdateRects. (default 0)

This is required for programmes where they have assumed this is

always the case which is contrary to the documentation.

SDL$<name>$CloseAction

0 Don't show close icon

1 Show close icon

***************************************************************************/

int

RISCOS_GetTaskName (char *task_name, size_t maxlen)

_kernel_swi_regs regs;

task_name[0] = 0;

/* Figure out a sensible task name */

if (_kernel_swi (OS_GetEnv, &regs, &regs) == 0) {

char *command_line = (char *) regs.r[0];

size_t len = SDL_strlen (command_line) + 1;

char *buffer = SDL_stack_alloc (char, len);

char *env_var;

char *p;

SDL_strlcpy (buffer, command_line, len);

p = SDL_strchr (buffer, ' ');

if (p)

*p = 0;

p = SDL_strrchr (buffer, '.');

if (p == 0)

p = buffer;

if (stricmp (p + 1, "!RunImage") == 0) {

*p = 0;

p = SDL_strrchr (buffer, '.');

if (p == 0)

p = buffer;

}

if (*p == '.')

p++;

if (*p == '!')

p++; /* Skip "!" at beginning of application directories */

if (*p == '<') {

// Probably in the form <appname$Dir>

char *q = SDL_strchr (p, '$');

if (q == 0)

q = SDL_strchr (p, '>'); /* Use variable name if not */

if (q)

*q = 0;

p++; /* Move over the < */

}

if (*p) {

/* Read variables that effect the RISC OS SDL engine for this task */

len = SDL_strlen (p) + 18; /* 18 is larger than the biggest variable name */

env_var = SDL_stack_alloc (char, len);

if (env_var) {

char *env_val;

/* See if a variable of form SDL$<dirname>$TaskName exists */

SDL_strlcpy (env_var, "SDL$", len);

SDL_strlcat (env_var, p, len);

SDL_strlcat (env_var, "$TaskName", len);

env_val = SDL_getenv (env_var);

if (env_val)

SDL_strlcpy (task_name, env_val, maxlen);

SDL_strlcpy (env_var, "SDL$", len);

SDL_strlcat (env_var, p, len);

SDL_strlcat (env_var, "$BackBuffer", len);

env_val = SDL_getenv (env_var);

if (env_val)

riscos_backbuffer = atoi (env_val);

SDL_strlcpy (env_var, "SDL$", len);

SDL_strlcat (env_var, p, len);

SDL_strlcat (env_var, "$CloseAction", len);

env_val = SDL_getenv (env_var);

if (env_val && SDL_strcmp (env_val, "0") == 0)

riscos_closeaction = 0;

SDL_stack_free (env_var);

}

if (!*task_name)

SDL_strlcpy (task_name, p, maxlen);

}

SDL_stack_free (buffer);

}

if (task_name[0] == 0)

SDL_strlcpy (task_name, "SDL Task", maxlen);

return 1;

}

/*****************************************************************

Store the current desktop screen mode if we are in the desktop.

******************************************************************/

void

RISCOS_StoreWimpMode ()

/* Don't store if in full screen mode */

if (stored_mode != -1)

return;

regs.r[0] = 1;

_kernel_swi (OS_ScreenMode, &regs, &regs);

if (regs.r[1] >= 0 && regs.r[1] < 256)

stored_mode = regs.r[1];

else {

int *retBlock = (int *) regs.r[1];

int *storeBlock;

int j;

while (blockSize < 5 || retBlock[blockSize] != -1)

blockSize++;

storeBlock = (int *) SDL_malloc (blockSize * sizeof (int));

retBlock = (int *) regs.r[1];

for (j = 0; j < blockSize; j++)

storeBlock[j] = retBlock[j];

stored_mode = (int) storeBlock;

}

fprintf (stderr, "Stored ");

dump_mode ();

#endif

}

/*****************************************************************

Restore desktop screen mode if we are in full screen mode.

*****************************************************************/

void

RISCOS_RestoreWimpMode ()

{

_kernel_swi_regs regs;

/* Only need to restore if we are in full screen mode */

if (stored_mode == -1)

return;

#if DUMP_MODE

fprintf (stderr, "Restored");

dump_mode ();

#endif

regs.r[0] = stored_mode;

_kernel_swi (Wimp_SetMode, &regs, &regs);

if (stored_mode < 0 || stored_mode > 256) {

SDL_free ((int *) stored_mode);

}

stored_mode = -1;

/* Flush keyboard buffer to dump the keystrokes we've already polled */

regs.r[0] = 21;

regs.r[1] = 0; /* Keyboard buffer number */

_kernel_swi (OS_Byte, &regs, &regs);

mouseInWindow = 0;

}

/*********************************************************************

Get version of Wimp running when task was initialised.

*********************************************************************/

int

RISCOS_GetWimpVersion ()

}

int

RISCOS_GetTaskHandle ()

/* vi: set ts=4 sw=4 expandtab: */