/*

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

slouken@devolution.com

*/

/*

File added by Alan Buckley (alan_baa@hotmail.com) for RISCOS compatability

27 March 2003

Implements RISCOS full screen display.

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.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_riscostask.h"

#include "SDL_riscosvideo.h"

#include "SDL_riscosevents_c.h"

#include "SDL_riscosmouse_c.h"

#include "kernel.h"

#include "swis.h"

#include "unixlib/os.h"

#include "unixlib/local.h"

/* Private structures */

typedef struct tagScreenModeBlock

{

int flags; // mode selector flags, bit 0 = 1, bit 1-7 format specifier, 8-31 reserved

int x_pixels;

int y_pixels;

int pixel_depth; // 2^pixel_depth = bpp,i.e. 0 = 1, 1 = 2, 4 = 16, 5 = 32

int frame_rate; // -1 use first match

int mode_vars[5]; // array of index, value pairs terminated by -1

} SCREENMODEBLOCK;

/* Helper functions */

void FULLSCREEN_SetDeviceMode(_THIS);

int FULLSCREEN_SetMode(int width, int height, int bpp);

void FULLSCREEN_SetupBanks(_THIS);

/* SDL video device functions for fullscreen mode */

static int FULLSCREEN_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);

static int FULLSCREEN_FlipHWSurface(_THIS, SDL_Surface *surface);

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

void FULLSCREEN_SetWMCaption(_THIS, const char *title, const char *icon);

extern int RISCOS_GetWmInfo(_THIS, SDL_SysWMinfo *info);

/* Local helper functions */

static int cmpmodes(const void *va, const void *vb);

static int FULLSCREEN_AddMode(_THIS, int bpp, int w, int h);

void FULLSCREEN_SetWriteBank(int bank);

void FULLSCREEN_SetDisplayBank(int bank);

static void FULLSCREEN_DisableEscape();

static void FULLSCREEN_EnableEscape();

void FULLSCREEN_BuildModeList(_THIS);

/* Following variable is set up in riskosTask.c */

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

SDL_Surface *FULLSCREEN_SetVideoMode(_THIS, SDL_Surface *current,

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

{

_kernel_swi_regs regs;

Uint32 Rmask = 0;

Uint32 Gmask = 0;

Uint32 Bmask = 0;

int create_back_buffer = riscos_backbuffer;

switch(bpp)

{

case 8:

flags |= SDL_HWPALETTE;

break;

case 15:

case 16:

Bmask = 0x00007c00;

Gmask = 0x000003e0;

Rmask = 0x0000001f;

break;

case 32:

Bmask = 0x00ff0000;

Gmask = 0x0000ff00;

Rmask = 0x000000ff;

break;

default:

SDL_SetError("Pixel depth not supported");

return NULL;

break;

}

if (FULLSCREEN_SetMode(width, height, bpp) == 0)

{

SDL_SetError("Couldn't set requested mode");

return (NULL);

}

/* printf("Setting mode %dx%d\n", width, height); */

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

if ( ! SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, 0) ) {

RISCOS_RestoreWimpMode();

SDL_SetError("Couldn't allocate new pixel format for requested mode");

return(NULL);

}

/* Set up the new mode framebuffer */

current->w = width;

this->hidden->height = current->h = height;

regs.r[0] = -1; /* -1 for current screen mode */

/* Get screen width in bytes */

regs.r[1] = 6; // Screen Width in bytes

_kernel_swi(OS_ReadModeVariable, &regs, &regs);

current->pitch = regs.r[2];

if (flags & SDL_DOUBLEBUF)

{

regs.r[0] = 2; /* Screen area */

_kernel_swi(OS_ReadDynamicArea, &regs, &regs);

/* Reg 1 has amount of memory currently used for display */

regs.r[0] = 2; /* Screen area */

regs.r[1] = (current->pitch * height * 2) - regs.r[1];

if (_kernel_swi(OS_ChangeDynamicArea, &regs, &regs) != NULL)

{

/* Can't allocate enough screen memory for double buffer */

flags &= ~SDL_DOUBLEBUF;

}

}

current->flags = flags | SDL_FULLSCREEN | SDL_HWSURFACE | SDL_PREALLOC;

/* Need to set display banks here for double buffering */

if (flags & SDL_DOUBLEBUF)

{

FULLSCREEN_SetWriteBank(0);

FULLSCREEN_SetDisplayBank(1);

create_back_buffer = 0; /* Don't need a back buffer for a double buffered display */

}

FULLSCREEN_SetupBanks(this);

if (create_back_buffer)

{

/* If not double buffered we may need to create a memory

** back buffer to simulate processing on other OS's.

** This is turned on by setting the enviromental variable

** SDL$<name>$BackBuffer to 1

*/

this->hidden->bank[0] = malloc(height * current->pitch);

if (this->hidden->bank[0] == 0)

{

RISCOS_RestoreWimpMode();

SDL_SetError("Couldnt allocate memory for back buffer");

return (NULL);

}

/* Surface updated in programs is now a software surface */

current->flags &= ~SDL_HWSURFACE;

}

/* Store address of allocated screen bank to be freed later */

if (this->hidden->alloc_bank) free(this->hidden->alloc_bank);

if (create_back_buffer)

{

this->hidden->alloc_bank = this->hidden->bank[0];

} else

this->hidden->alloc_bank = 0;

// Clear both banks to black

memset(this->hidden->bank[0], 0, height * current->pitch);

memset(this->hidden->bank[1], 0, height * current->pitch);

this->hidden->current_bank = 0;

current->pixels = this->hidden->bank[0];

/* Reset device functions for the wimp */

FULLSCREEN_SetDeviceMode(this);

/* FULLSCREEN_DisableEscape(); */

/* We're done */

return(current);

}

/* Reset any device functions that have been changed because we have run in WIMP mode */

void FULLSCREEN_SetDeviceMode(_THIS)

{

if (this->SetColors == FULLSCREEN_SetColors) return; /* Already set up */

this->SetColors = FULLSCREEN_SetColors;

this->UpdateRects = FULLSCREEN_UpdateRects;

this->FlipHWSurface = FULLSCREEN_FlipHWSurface;

this->SetCaption = FULLSCREEN_SetWMCaption;

this->SetIcon = NULL;

this->IconifyWindow = NULL;

this->ShowWMCursor = RISCOS_ShowWMCursor;

this->WarpWMCursor = FULLSCREEN_WarpWMCursor;

this->PumpEvents = FULLSCREEN_PumpEvents;

}

/* Query for the list of available video modes */

void FULLSCREEN_BuildModeList(_THIS)

{

_kernel_swi_regs regs;

char *enumInfo = NULL;

char *enum_ptr;

int *blockInfo;

int j;

int num_modes;

/* Find out how much space we need */

regs.r[0] = 2; /* Reason code */

regs.r[2] = 0; /* Number of modes to skip */

regs.r[6] = 0; /* pointer to block or 0 for count */

regs.r[7] = 0; /* Size of block in bytes */

_kernel_swi(OS_ScreenMode, &regs, &regs);

num_modes = -regs.r[2];

/* Video memory should be in r[5] */

this->info.video_mem = regs.r[5]/1024;

enumInfo = (unsigned char *)malloc(-regs.r[7]);

if (enumInfo == NULL)

{

SDL_OutOfMemory();

return;

}

/* Read mode information into block */

regs.r[2] = 0;

regs.r[6] = (int)enumInfo;

regs.r[7] = -regs.r[7];

_kernel_swi(OS_ScreenMode, &regs, &regs);

enum_ptr = enumInfo;

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

{

blockInfo = (int *)enum_ptr;

if ((blockInfo[1] & 255) == 1) /* We understand this format */

{

switch(blockInfo[4])

{

case 3: /* 8 bits per pixel */

FULLSCREEN_AddMode(this, 8, blockInfo[2], blockInfo[3]);

break;

case 4: /* 15 bits per pixel */

FULLSCREEN_AddMode(this, 15, blockInfo[2], blockInfo[3]);

break;

case 5: /* 32 bits per pixel */

FULLSCREEN_AddMode(this, 32, blockInfo[2], blockInfo[3]);

break;

}

}

enum_ptr += blockInfo[0];

}

free(enumInfo);

/* Sort the mode lists */

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

if ( SDL_nummodes[j] > 0 ) {

qsort(SDL_modelist[j], SDL_nummodes[j], sizeof *SDL_modelist[j], cmpmodes);

}

}

}

static int FULLSCREEN_FlipHWSurface(_THIS, SDL_Surface *surface)

{

_kernel_swi_regs regs;

regs.r[0] = 19;

/* Wait for Vsync */

_kernel_swi(OS_Byte, &regs, &regs);

FULLSCREEN_SetDisplayBank(this->hidden->current_bank);

this->hidden->current_bank ^= 1;

FULLSCREEN_SetWriteBank(this->hidden->current_bank);

surface->pixels = this->hidden->bank[this->hidden->current_bank];

return(0);

}

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

{

if (riscos_backbuffer && (this->screen->flags & SDL_DOUBLEBUF) == 0)

{

/* If not double buffered copy rectangles to main screen now */

int j;

char *to, *from;

int pitch = this->screen->pitch;

int row;

int xmult = this->screen->format->BytesPerPixel;

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

{

from = this->hidden->bank[0] + rects->x * xmult + rects->y * pitch;

to = this->hidden->bank[1] + rects->x * xmult + rects->y * pitch;

for (row = 0; row < rects->h; row++)

{

memcpy(to, from, rects->w * xmult);

from += pitch;

to += pitch;

}

rects++;

}

}

}

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

{

_kernel_swi_regs regs;

int palette[256];

regs.r[0] = -1;

regs.r[1] = -1;

regs.r[2] = (int)palette;

regs.r[3] = 1024;

regs.r[4] = 0;

_kernel_swi(ColourTrans_ReadPalette, &regs, &regs);

while(ncolors--)

{

palette[firstcolor] = ((colors->b) << 24) | ((colors->g) << 16) | ((colors->r) << 8);

firstcolor++;

colors++;

}

regs.r[0] = -1;

regs.r[1] = -1;

regs.r[2] = (int)palette;

regs.r[3] = 0;

regs.r[4] = 0;

_kernel_swi(ColourTrans_WritePalette, &regs, &regs);

return(1);

}

static int cmpmodes(const void *va, const void *vb)

{

SDL_Rect *a = *(SDL_Rect **)va;

SDL_Rect *b = *(SDL_Rect **)vb;

if(a->w > b->w)

return -1;

return b->h - a->h;

}

static int FULLSCREEN_AddMode(_THIS, int bpp, int w, int h)

{

SDL_Rect *mode;

int i, index;

int next_mode;

/* Check to see if we already have this mode */

if ( bpp < 8 ) { /* Not supported */

return(0);

}

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

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

mode = SDL_modelist[index][i];

if ( (mode->w == w) && (mode->h == h) ) {

return(0);

}

}

/* Set up the new video mode rectangle */

mode = (SDL_Rect *)malloc(sizeof *mode);

if ( mode == NULL ) {

SDL_OutOfMemory();

return(-1);

}

mode->x = 0;

mode->y = 0;

mode->w = w;

mode->h = h;

/* Allocate the new list of modes, and fill in the new mode */

next_mode = SDL_nummodes[index];

SDL_modelist[index] = (SDL_Rect **)

realloc(SDL_modelist[index], (1+next_mode+1)*sizeof(SDL_Rect *));

if ( SDL_modelist[index] == NULL ) {

SDL_OutOfMemory();

SDL_nummodes[index] = 0;

free(mode);

return(-1);

}

SDL_modelist[index][next_mode] = mode;

SDL_modelist[index][next_mode+1] = NULL;

SDL_nummodes[index]++;

return(0);

}

void FULLSCREEN_SetWriteBank(int bank)

{

_kernel_swi_regs regs;

regs.r[0] = 112;

regs.r[1] = bank+1;

_kernel_swi(OS_Byte, &regs, &regs);

}

void FULLSCREEN_SetDisplayBank(int bank)

{

_kernel_swi_regs regs;

regs.r[0] = 113;

regs.r[1] = bank+1;

_kernel_swi(OS_Byte, &regs, &regs);

}

/** Disable special escape key processing */

static void FULLSCREEN_DisableEscape()

{

_kernel_swi_regs regs;

regs.r[0] = 229;

regs.r[1] = 1;

regs.r[2] = 0;

_kernel_swi(OS_Byte, &regs, &regs);

}

/** Enable special escape key processing */

static void FULLSCREEN_EnableEscape()

{

_kernel_swi_regs regs;

regs.r[0] = 229;

regs.r[1] = 0;

regs.r[2] = 0;

_kernel_swi(OS_Byte, &regs, &regs);

}

/** Store caption in case this is called before we create a window */

void FULLSCREEN_SetWMCaption(_THIS, const char *title, const char *icon)

{

strncpy(this->hidden->title, title, 255);

this->hidden->title[255] = 0;

}

/* Set screen mode

*

* Returns 1 if mode is set ok, otherwise 0

*/

int FULLSCREEN_SetMode(int width, int height, int bpp)

{

SCREENMODEBLOCK smb;

_kernel_swi_regs regs;

smb.flags = 1;

smb.x_pixels = width;

smb.y_pixels = height;

smb.mode_vars[0] = -1;

switch(bpp)

{

case 8:

smb.pixel_depth = 3;

/* Note: Need to set ModeFlags to 128 and NColour variables to 255 get full 8 bit palette */

smb.mode_vars[0] = 0; smb.mode_vars[1] = 128; /* Mode flags */

smb.mode_vars[2] = 3; smb.mode_vars[3] = 255; /* NColour (number of colours -1) */

smb.mode_vars[4] = -1; /* End of list */

break;

case 15:

case 16:

smb.pixel_depth = 4;

break;

case 32:

smb.pixel_depth = 5;

break;

default:

SDL_SetError("Pixel depth not supported");

return 0;

break;

}

smb.frame_rate = -1;

regs.r[0] = 0;

regs.r[1] = (int)&smb;

if (_kernel_swi(OS_ScreenMode, &regs, &regs) != 0)

{

SDL_SetError("Couldn't set requested mode");

return 0;

}

/* Turn cursor off*/

_kernel_oswrch(23);_kernel_oswrch(1);_kernel_oswrch(0);

_kernel_oswrch(0);_kernel_oswrch(0);_kernel_oswrch(0);

_kernel_oswrch(0);_kernel_oswrch(0);_kernel_oswrch(0);

_kernel_oswrch(0);_kernel_oswrch(0);

return 1;

}

/* Get Start addresses for the screen banks */

void FULLSCREEN_SetupBanks(_THIS)

{

_kernel_swi_regs regs;

int block[5];

block[0] = 148; /* Write screen start */

block[1] = 149; /* Display screen start */

block[2] = 4; /* X eig factor */

block[3] = 5; /* Y eig factor */

block[4] = -1; /* End of list of variables to request */

regs.r[0] = (int)block;

regs.r[1] = (int)block;

_kernel_swi(OS_ReadVduVariables, &regs, &regs);

this->hidden->bank[0] = (void *)block[0];

this->hidden->bank[1] = (void *)block[1];

this->hidden->xeig = block[2];

this->hidden->yeig = block[3];

}

/* Toggle to full screen mode from the WIMP */

int FULLSCREEN_ToggleFromWimp(_THIS)

{

int width = this->screen->w;

int height = this->screen->h;

int bpp = this->screen->format->BitsPerPixel;

RISCOS_StoreWimpMode();

if (FULLSCREEN_SetMode(width, height, bpp))

{

char *buffer = this->hidden->alloc_bank; /* This is start of sprite data */

/* Support back buffer mode only */

riscos_backbuffer = 1;

FULLSCREEN_SetupBanks(this);

this->hidden->bank[0] = buffer + 60; /* Start of sprite data */

if (bpp == 8) this->hidden->bank[0] += 2048; /* 8bpp sprite have palette first */

this->hidden->current_bank = 0;

this->screen->pixels = this->hidden->bank[0];

/* Copy back buffer to screen memory */

memcpy(this->hidden->bank[1], this->hidden->bank[0], width * height * this->screen->format->BytesPerPixel);

FULLSCREEN_SetDeviceMode(this);

return 1;

} else

RISCOS_RestoreWimpMode();

return 0;

}