/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2004 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

*/

/*

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

27 March 2003

Implements RISC OS Wimp 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"

/* Initialization/Query functions */

SDL_Rect **WIMP_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

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

int WIMP_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);

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

extern unsigned char *WIMP_CreateBuffer(int width, int height, int bpp);

extern void WIMP_PumpEvents(_THIS);

extern void WIMP_PlotSprite(_THIS, int x, int y);

extern void WIMP_SetupPlotInfo(_THIS);

extern void WIMP_SetFocus(int win);

/* etc. */

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

/* RISC OS Wimp handling helpers */

void WIMP_ReadModeInfo(_THIS);

unsigned int WIMP_SetupWindow(_THIS, SDL_Surface *surface);

void WIMP_SetDeviceMode(_THIS);

void WIMP_DeleteWindow(_THIS);

/* FULLSCREEN function required for wimp/fullscreen toggling */

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

/* Currently need to set this up here as it only works if you

start up in a Wimp mode */

extern int RISCOS_ToggleFullScreen(_THIS, int fullscreen);

extern int riscos_backbuffer;

extern int mouseInWindow;

extern int riscos_closeaction;

/* Following needed to ensure window is shown immediately */

extern int hasFocus;

extern void WIMP_Poll(_THIS, int waitTime);

SDL_Surface *WIMP_SetVideoMode(_THIS, SDL_Surface *current,

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

{

Uint32 Rmask = 0;

Uint32 Gmask = 0;

Uint32 Bmask = 0;

char *buffer = NULL;

int bytesPerPixel = 1;

/* Don't support double buffering in Wimp mode */

flags &= ~SDL_DOUBLEBUF;

flags &= ~SDL_HWSURFACE;

switch(bpp)

{

case 8:

/* Emulated palette using ColourTrans */

flags |= SDL_HWPALETTE;

break;

case 15:

case 16:

Bmask = 0x00007c00;

Gmask = 0x000003e0;

Rmask = 0x0000001f;

bytesPerPixel = 2;

break;

case 32:

Bmask = 0x00ff0000;

Gmask = 0x0000ff00;

Rmask = 0x000000ff;

bytesPerPixel = 4;

break;

default:

SDL_SetError("Pixel depth not supported");

return NULL;

break;

}

/* 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) ) {

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;

if (bpp == 15) bpp = 16;

buffer = WIMP_CreateBuffer(width, height, bpp);

if (buffer == NULL)

{

SDL_SetError("Couldn't create sprite for video memory");

return (NULL);

}

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->bank[1] = buffer; /* Start of buffer */

/* Remember sprite buffer so it can be freed later */

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

this->hidden->alloc_bank = buffer;

current->pitch = width * bytesPerPixel;

if ((current->pitch & 3))

{

/* Sprites are 32bit word aligned */

current->pitch += (4 - (current->pitch & 3));

}

current->flags = flags | SDL_PREALLOC;

WIMP_ReadModeInfo(this);

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

this->hidden->current_bank = 0;

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

if (WIMP_SetupWindow(this, current) == 0)

{

SDL_SetError("Unable to create window to display surface");

return NULL;

}

/* Reset device functions for the wimp */

WIMP_SetDeviceMode(this);

/* Needs to set up plot info after window has been created */

/* Not sure why, but plots don't work if I do it earlier */

WIMP_SetupPlotInfo(this);

/* Poll until window is shown */

{

/* We wait until it gets the focus, but give up after 5 seconds

in case the focus is prevented in any way.

*/

Uint32 now = SDL_GetTicks();

while (!hasFocus && SDL_GetTicks() - now < 5000)

{

WIMP_Poll(this, 0);

}

}

/* We're done */

return(current);

}

void WIMP_ReadModeInfo(_THIS)

{

_kernel_swi_regs regs;

int vars[6];

int vals[5];

vars[0] = 4; /* XEig */

vars[1] = 5; /* YEig */

vars[2] = 9; /* Log base 2 bpp */

vars[3] = 11; /* Screen Width - 1 */

vars[4] = 12; /* Screen Depth - 1 */

vars[5] = -1; /* Terminate list */

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

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

_kernel_swi(OS_ReadVduVariables, &regs, &regs);

this->hidden->xeig = vals[0];

this->hidden->yeig = vals[1];

this->hidden->screen_bpp = 1 << vals[2];

this->hidden->screen_width = vals[3] + 1;

this->hidden->screen_height = vals[4] + 1;

}

/* Set device function to call the correct versions for running

in a wimp window */

void WIMP_SetDeviceMode(_THIS)

{

if (this->UpdateRects == WIMP_UpdateRects) return; /* Already set up */

this->SetColors = WIMP_SetColors;

this->UpdateRects = WIMP_UpdateRects;

this->FlipHWSurface = NULL;

this->SetCaption = WIMP_SetWMCaption;

this->SetIcon = NULL;

this->IconifyWindow = NULL;

this->ShowWMCursor = WIMP_ShowWMCursor;

this->WarpWMCursor = WIMP_WarpWMCursor;

this->ToggleFullScreen = RISCOS_ToggleFullScreen;

this->PumpEvents = WIMP_PumpEvents;

}

/* Setup the Window to display the surface */

unsigned int WIMP_SetupWindow(_THIS, SDL_Surface *surface)

{

_kernel_swi_regs regs;

int window_data[23];

int *window_block = window_data+1;

int x = (this->hidden->screen_width - surface->w) / 2;

int y = (this->hidden->screen_height - surface->h) / 2;

int xeig = this->hidden->xeig;

int yeig = this->hidden->yeig;

mouseInWindow = 0;

/* Always delete the window and recreate on a change */

if (this->hidden->window_handle) WIMP_DeleteWindow(this);

/* Setup window co-ordinates */

window_block[0] = x << xeig;

window_block[1] = y << yeig;

window_block[2] = window_block[0] + (surface->w << xeig);

window_block[3] = window_block[1] + (surface->h << yeig);

window_block[4] = 0; /* Scroll offsets */

window_block[5] = 0;

window_block[6] = -1; /* Open on top of window stack */

window_block[7] = 0x85040042; /* Window flags */

if (riscos_closeaction != 0) window_block[7] |= 0x2000000;

/* TODO: Take into account surface->flags */

window_block[8] = 0xff070207; /* Window colours */

window_block[9] = 0x000c0103;

window_block[10] = 0; /* Work area minimum */

window_block[11] = -surface->h << yeig;

window_block[12] = surface->w << xeig; /* Work area maximum */

window_block[13] = 0;

window_block[14] = 0x2700013d; /* Title icon flags */

window_block[15] = 0x00003000; /* Work area flags - Mouse click down reported */

window_block[16] = 1; /* Sprite area control block pointer */

window_block[17] = 0x00100010; /* Minimum window size (width & height) (16x16)*/

window_block[18] = (int)this->hidden->title; /* Title data */

window_block[19] = -1;

window_block[20] = 256;

window_block[21] = 0; /* Number of icons */

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

/* Create the window */

if (_kernel_swi(Wimp_CreateWindow, &regs, &regs) == NULL)

{

this->hidden->window_handle = window_data[0] = regs.r[0];

/* Show the window on the screen */

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

if (_kernel_swi(Wimp_OpenWindow, &regs, &regs) == NULL)

{

WIMP_SetFocus(this->hidden->window_handle);

} else

{

WIMP_DeleteWindow(this);

}

}

return this->hidden->window_handle;

}

/* Destroy the Window */

void WIMP_DeleteWindow(_THIS)

{

_kernel_swi_regs regs;

regs.r[1] = (unsigned int)&(this->hidden->window_handle);

_kernel_swi(Wimp_DeleteWindow, &regs, &regs);

this->hidden->window_handle = 0;

}

void WIMP_UpdateRects(_THIS, int numrects, SDL_Rect *rects)

{

_kernel_swi_regs regs;

int update_block[12];

int xeig = this->hidden->xeig;

int yeig = this->hidden->yeig;

int j;

update_block[0] = this->hidden->window_handle;

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

{

update_block[1] = rects[j].x << xeig; /* Min X */

update_block[4] = -(rects[j].y << yeig);

update_block[3] = update_block[1] + (rects[j].w << xeig);

update_block[2] = update_block[4] - (rects[j].h << yeig);

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

/* Update window can fail if called before first poll */

if (_kernel_swi(Wimp_UpdateWindow, &regs, &regs) == 0)

{

while (regs.r[0])

{

WIMP_PlotSprite(this, update_block[1], update_block[2]);

_kernel_swi(Wimp_GetRectangle, &regs, &regs);

}

}

}

}

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

{

unsigned int *pal = (unsigned int *)(this->hidden->bank[1]+60);

int j;

SDL_Rect update;

pal += firstcolor*2;

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

{

*pal = (((unsigned int)colors->r) << 8)

+ (((unsigned int)colors->g) << 16)

+ (((unsigned int)colors->b) << 24);

pal[1] = *pal;

pal += 2;

colors++;

}

WIMP_SetupPlotInfo(this);

/* Need to refresh the window */

update.x = 0;

update.y = 0;

update.w = SDL_VideoSurface->w;

update.h = SDL_VideoSurface->h;

WIMP_UpdateRects(this, 1, &update);

return 1;

}

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

{

_kernel_swi_regs regs;

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

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

if (RISCOS_GetWimpVersion() < 380)

{

int block[6];

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

_kernel_swi(Wimp_GetCaretPosition, &regs, &regs);

if (block[0] == (int)this->hidden->window_handle)

{

regs.r[0] = -1;

_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);

} else

{

regs.r[0] = this->hidden->window_handle;

regs.r[1] = -1;

regs.r[2] = -1;

regs.r[3] = -1;

_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);

}

regs.r[0] = block[0];

regs.r[1] = block[1];

regs.r[2] = block[2];

regs.r[3] = block[3];

regs.r[4] = block[4];

regs.r[5] = block[5];

_kernel_swi(Wimp_SetCaretPosition, &regs,&regs);

} else

{

regs.r[0] = this->hidden->window_handle;

regs.r[1] = 0x4b534154; /* "TASK" */

regs.r[2] = 3; /* Redraw title */

_kernel_swi(Wimp_ForceRedraw, &regs, &regs);

}

}

void WIMP_RefreshDesktop(_THIS)

{

int width = this->hidden->screen_width << this->hidden->xeig;

int height = this->hidden->screen_height << this->hidden->yeig;

_kernel_swi_regs regs;

regs.r[0] = -1; /* Whole screen */

regs.r[1] = 0;

regs.r[2] = 0;

regs.r[3] = width;

regs.r[4] = height;

_kernel_swi(Wimp_ForceRedraw, &regs, &regs);

}

/* Toggle to window from full screen */

int WIMP_ToggleFromFullScreen(_THIS)

{

int width = this->screen->w;

int height = this->screen->h;

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

char *buffer = NULL;

char *old_bank[2];

char *old_alloc_bank;

/* Ensure flags are OK */

this->screen->flags &= ~(SDL_DOUBLEBUF|SDL_HWSURFACE);

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

{

/* Need to create a sprite for the screen and copy the data to it */

char *data;

buffer = WIMP_CreateBuffer(width, height, bpp);

data = buffer + 60; /* Start of sprite data */

if (bpp == 8) data += 2048; /* 8bpp sprite have palette first */

if (buffer == NULL) return 0;

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

}

/* else We've switch to full screen before so we already have a sprite */

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

old_bank[1] = this->hidden->bank[1];

old_alloc_bank = this->hidden->alloc_bank;

if (buffer != NULL) this->hidden->alloc_bank = buffer;

this->hidden->bank[1] = this->hidden->alloc_bank;

this->hidden->bank[0] = this->hidden->bank[1] + 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];

RISCOS_RestoreWimpMode();

WIMP_ReadModeInfo(this);

if (WIMP_SetupWindow(this, this->screen))

{

WIMP_SetDeviceMode(this);

WIMP_SetupPlotInfo(this);

if (riscos_backbuffer == 0) riscos_backbuffer = 1;

if (buffer && old_alloc_bank) free(old_alloc_bank);

return 1;

} else

{

/* Drop back to full screen mode on failure */

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

this->hidden->bank[1] = old_bank[1];

this->hidden->alloc_bank = old_alloc_bank;

if (buffer) free(buffer);

RISCOS_StoreWimpMode();

FULLSCREEN_SetMode(width, height, bpp);

}

return 0;

}