sdl_riscosfullscreenvideo.c

SDL库 在进行视频显示程序spcaview安装时必须的库文件

/*
    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
    [e-mail]
*/
#include "SDL_config.h"

/*
     File added by Alan Buckley ([e-mail]) for RISC OS compatability
	 27 March 2003

     Implements RISC OS full screen display.
*/

#include "SDL_video.h"
#include "SDL_mouse.h"
#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../../events/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);
void FULLSCREEN_SetWMCaption(_THIS, const char *title, const char *icon);
extern int RISCOS_GetWmInfo(_THIS, SDL_SysWMinfo *info);

/* UpdateRects variants */
static void FULLSCREEN_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
static void FULLSCREEN_UpdateRectsMemCpy(_THIS, int numrects, SDL_Rect *rects);
static void FULLSCREEN_UpdateRects8bpp(_THIS, int numrects, SDL_Rect *rects);
static void FULLSCREEN_UpdateRects16bpp(_THIS, int numrects, SDL_Rect *rects);
static void FULLSCREEN_UpdateRects32bpp(_THIS, int numrects, SDL_Rect *rects);
static void FULLSCREEN_UpdateRectsOS(_THIS, int numrects, SDL_Rect *rects);

/* 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 */

/* Following is used to create a sprite back buffer */
extern unsigned char *WIMP_CreateBuffer(int width, int height, int bpp);

/* Fast assembler copy */
extern void RISCOS_Put32(void *to, int pixels, int pitch, int rows, void *from, int src_skip_bytes);

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 OSes.
         ** This is turned on by setting the enviromental variable
         ** SDL$<name>$BackBuffer >= 1
         */
       if (riscos_backbuffer == 3)
          this->hidden->bank[0] = WIMP_CreateBuffer(width, height, bpp);
       else
          this->hidden->bank[0] = SDL_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) SDL_free(this->hidden->alloc_bank);
    if (create_back_buffer)
    {
        this->hidden->alloc_bank = this->hidden->bank[0];
        if (riscos_backbuffer == 3)
        {
           this->hidden->bank[0] += 60; /* Start of sprite data */
           if (bpp == 8) this->hidden->bank[0] += 2048; /* 8bpp sprite have palette first */
        }
    } else
	  this->hidden->alloc_bank = 0;

    // Clear both banks to black
    SDL_memset(this->hidden->bank[0], 0, height * current->pitch);
    SDL_memset(this->hidden->bank[1], 0, height * current->pitch);

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

    /* Have to set the screen here, so SetDeviceMode will pick it up */
    this->screen = current;

	/* 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)
{
	/* Update rects is different if we have a backbuffer */

	if (riscos_backbuffer && (this->screen->flags & SDL_DOUBLEBUF) == 0)
      {
	   switch(riscos_backbuffer)
         {
            case 2: /* ARM code full word copy */
               switch(this->screen->format->BytesPerPixel)
               {
                  case 1: /* 8bpp modes */
               	   this->UpdateRects = FULLSCREEN_UpdateRects8bpp;
                     break;
                  case 2: /* 15/16bpp modes */
               	   this->UpdateRects = FULLSCREEN_UpdateRects16bpp;
                     break;
                  case 4: /* 32 bpp modes */
               	   this->UpdateRects = FULLSCREEN_UpdateRects32bpp;
                     break;

                  default: /* Just default to the memcpy routine */
               	   this->UpdateRects = FULLSCREEN_UpdateRectsMemCpy;
                     break;
                }
               break;

            case 3: /* Use OS sprite plot routine */
               this->UpdateRects = FULLSCREEN_UpdateRectsOS;
               break;

            default: /* Old but safe memcpy */
               this->UpdateRects = FULLSCREEN_UpdateRectsMemCpy;
               break;
         }
      } else
	   this->UpdateRects = FULLSCREEN_UpdateRects; /* Default do nothing implementation */

	this->SetColors   = FULLSCREEN_SetColors;

	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 *)SDL_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];
	}

	SDL_free(enumInfo);
		
	/* Sort the mode lists */
	for ( j=0; j<NUM_MODELISTS; ++j ) {
		if ( SDL_nummodes[j] > 0 ) {
			SDL_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;

   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];

   /* Wait for Vsync */
   _kernel_swi(OS_Byte, &regs, &regs);

	return(0);
}

/* Nothing to do if we are writing direct to hardware */
static void FULLSCREEN_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
{
}

/* Safe but slower Memory copy from our allocated back buffer */
static void FULLSCREEN_UpdateRectsMemCpy(_THIS, int numrects, SDL_Rect *rects)
{
      int j;
      char *to, *from;
      int pitch = this->screen->pitch;
      int row;
      int xmult = this->screen->format->BytesPerPixel;
      for (j = 0; j < numrects; j++)