Home | History | Annotate | Download | only in riscos
      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Library General Public
      7     License as published by the Free Software Foundation; either
      8     version 2 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Library General Public License for more details.
     14 
     15     You should have received a copy of the GNU Library General Public
     16     License along with this library; if not, write to the Free
     17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 /*
     25      File added by Alan Buckley (alan_baa (at) hotmail.com) for RISC OS compatability
     26 	 27 March 2003
     27 
     28      Implements Sprite plotting code for wimp display.window
     29 */
     30 
     31 #include "kernel.h"
     32 #include "swis.h"
     33 
     34 #include "SDL_stdinc.h"
     35 #include "SDL_riscosvideo.h"
     36 
     37 extern void WIMP_ReadModeInfo(_THIS);
     38 
     39 void WIMP_PaletteChanged(_THIS);
     40 
     41 
     42 /* Create sprite buffer for screen */
     43 
     44 unsigned char *WIMP_CreateBuffer(int width, int height, int bpp)
     45 {
     46 	int size;
     47 	char sprite_name[12] = "display";
     48 	unsigned char *buffer;
     49 	_kernel_swi_regs regs;
     50 	int bytesPerPixel;
     51 	int bytesPerRow;
     52 	int offsetToSpriteData = 60;
     53 
     54 	switch(bpp)
     55 	{
     56 	case 32: bytesPerPixel = 4; break;
     57 	case 16: bytesPerPixel = 2; break;
     58 	case 8:
     59 	    bytesPerPixel = 1;
     60 	    offsetToSpriteData += 2048; /* Add in size of palette */
     61 	    break;
     62 	default:
     63 		return NULL;
     64 		break;
     65 	}
     66 
     67 	bytesPerRow = bytesPerPixel * width;
     68 
     69 	if ((bytesPerRow & 3) != 0)
     70 	{
     71 		bytesPerRow += 4 - (bytesPerRow & 3);
     72 	}
     73 	size = bytesPerRow * height;
     74 
     75 	buffer = SDL_malloc( (size_t) size + offsetToSpriteData );
     76 	if (!buffer) return NULL;
     77 
     78    /* Initialise a sprite area */
     79 
     80 	*(unsigned int *)buffer		= size + offsetToSpriteData;
     81 	*(unsigned int *)(buffer + 8)	= 16;
     82 
     83 	regs.r[0] = 256+9;
     84 	regs.r[1] = (unsigned int)buffer;
     85    _kernel_swi(OS_SpriteOp, &regs, &regs);
     86 
     87 	regs.r[0] = 256+15;
     88 	regs.r[1] = (unsigned int)buffer;
     89 	regs.r[2] = (unsigned int)&sprite_name;
     90 	regs.r[3] = 0; /* Palette flag: 0 = no palette */
     91 	regs.r[4] = width;
     92 	regs.r[5] = height;
     93 	if (bpp == 8)
     94 	{
     95 		/* Use old style mode number */
     96 		regs.r[6] = 28; /* 8bpp 90x90dpi */
     97 	} else
     98 	{
     99 		regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
    100 					| (90 << 14) /* Vertical dpi */
    101 					| (90 << 1)  /* Horizontal dpi */
    102 					| 1; /* Marker to distinguish between mode selectors and sprite modes */
    103 	}
    104    if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL)
    105    {
    106        if (bpp == 8)
    107        {
    108           /* Modify sprite to take into account 256 colour palette */
    109           int *sprite = (int *)(buffer + 16);
    110           /* Adjust sprite offsets */
    111           sprite[0] += 2048;
    112           sprite[8] += 2048;
    113           sprite[9] += 2048;
    114           /* Adjust sprite area next free pointer */
    115           (*(int *)(buffer+12)) += 2048;
    116 
    117           /* Don't need to set up palette as SDL sets up the default
    118              256 colour palette */
    119 /*          {
    120              int *pal = sprite + 11;
    121              unsigned int j;
    122              unsigned int entry;
    123              for (j = 0; j < 255; j++)
    124              {
    125                 entry = (j << 24) | (j << 16) | (j << 8);
    126                 *pal++ = entry;
    127                 *pal++ = entry;
    128              }
    129           }
    130 */
    131        }
    132    } else
    133    {
    134       SDL_free(buffer);
    135       buffer = NULL;
    136    }
    137 
    138    return buffer;
    139 }
    140 
    141 
    142 /* Setup translation buffers for the sprite plotting */
    143 
    144 void WIMP_SetupPlotInfo(_THIS)
    145 {
    146    _kernel_swi_regs regs;
    147    int *sprite = ((int *)this->hidden->bank[1])+4;
    148 
    149    regs.r[0] = (unsigned int)this->hidden->bank[1];
    150    regs.r[1] = (unsigned int)sprite;
    151    regs.r[2] = -1; /* Current mode */
    152    regs.r[3] = -1; /* Current palette */
    153    regs.r[4] = 0; /* Get size of buffer */
    154    regs.r[5] = 1|2|16; /* R1 - pointer to sprite and can use full palette words */
    155    regs.r[6] = 0;
    156    regs.r[7] = 0;
    157 
    158    if (this->hidden->pixtrans) SDL_free(this->hidden->pixtrans);
    159    this->hidden->pixtrans = 0;
    160 
    161    /* Get the size required for the buffer */
    162    _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
    163    if (regs.r[4])
    164    {
    165       this->hidden->pixtrans = SDL_malloc(regs.r[4]);
    166 
    167       regs.r[4] = (unsigned int)this->hidden->pixtrans;
    168       /* Actually read the buffer */
    169       _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
    170    }
    171 }
    172 
    173 /* Plot the sprite in the given context */
    174 void WIMP_PlotSprite(_THIS, int x, int y)
    175 {
    176    _kernel_swi_regs regs;
    177    _kernel_oserror *err;
    178 
    179    regs.r[0] =  52 + 512;
    180    regs.r[1] = (unsigned int)this->hidden->bank[1];
    181    regs.r[2] = (unsigned int)this->hidden->bank[1]+16;
    182    regs.r[3] = x;
    183    regs.r[4] = y;
    184    regs.r[5] = 0|32; /* Overwrite screen and pixtrans contains wide colour entries */
    185    regs.r[6] = 0; /* No scale factors i.e. 1:1 */
    186    regs.r[7] = (int)this->hidden->pixtrans;
    187 
    188    if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0)
    189    {
    190       int *p = (int *)this->hidden->pixtrans;
    191       printf("OS_SpriteOp failed \n%s\n",err->errmess);
    192       printf("pixtrans %d\n", (int)this->hidden->pixtrans);
    193       printf("%x %x %x\n", p[0], p[1], p[2]);
    194    }
    195 }
    196 
    197 
    198 /* Wimp mode has changes so update colour mapping and pixel sizes
    199    of windows and the sprites they plot */
    200 
    201 void WIMP_ModeChanged(_THIS)
    202 {
    203 	int oldXeig = this->hidden->xeig;
    204 	int oldYeig = this->hidden->yeig;
    205 
    206 	WIMP_ReadModeInfo(this);
    207 
    208 	if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig)
    209 	{
    210 		/* Only need to update the palette */
    211 		WIMP_PaletteChanged(this);
    212 	} else
    213 	{
    214 		_kernel_swi_regs regs;
    215 		int window_state[9];
    216 		int extent[4];
    217 		int currWidth, currHeight;
    218 		int newWidth, newHeight;
    219 
    220 		/* Need to resize windows and update the palette */
    221 		WIMP_SetupPlotInfo(this);
    222 
    223 
    224 		window_state[0] = this->hidden->window_handle;
    225 		regs.r[1] = (unsigned int)window_state;
    226 		_kernel_swi(Wimp_GetWindowState, &regs, &regs);
    227 
    228 		currWidth = window_state[3] - window_state[1];
    229 		currHeight = window_state[4] - window_state[2];
    230 
    231 		newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
    232 		newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
    233 		/* Need to avoid extent getting too small for visible part
    234 		of window */
    235 		extent[0] = 0;
    236 		if (currHeight <= newHeight)
    237 		{
    238 			extent[1] = -newHeight;
    239 		} else
    240 		{
    241 			extent[1] = -currHeight;
    242 		}
    243 		if (currWidth <= newWidth)
    244 		{
    245 			extent[2] = newWidth;
    246 		} else
    247 		{
    248 			extent[2] = currWidth;
    249 		}
    250 		extent[3] = 0;
    251 
    252 		regs.r[0] = this->hidden->window_handle;
    253 		regs.r[1] = (int)extent;
    254 		_kernel_swi(Wimp_SetExtent, &regs, &regs);
    255 
    256 		/*TODO: May need to set flag to resize window on next open */
    257 	}
    258 }
    259 
    260 /* Palette has changed so update palettes used for windows sprites */
    261 
    262 void WIMP_PaletteChanged(_THIS)
    263 {
    264 	WIMP_SetupPlotInfo(this);
    265 }
    266