aboutsummaryrefslogtreecommitdiffstats
path: root/distrib/sdl-1.2.15/src/video/riscos/SDL_riscossprite.c
blob: 70b2f919db0bfb3c1170ed2e30f7d839fb1c1532 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2012 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
*/
#include "SDL_config.h"

/*
     File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
	 27 March 2003

     Implements Sprite plotting code for wimp display.window
*/

#include "kernel.h"
#include "swis.h"

#include "SDL_stdinc.h"
#include "SDL_riscosvideo.h"

extern void WIMP_ReadModeInfo(_THIS);

void WIMP_PaletteChanged(_THIS);


/* Create sprite buffer for screen */

unsigned char *WIMP_CreateBuffer(int width, int height, int bpp)
{
	int size;
	char sprite_name[12] = "display";
	unsigned char *buffer;
	_kernel_swi_regs regs;
	int bytesPerPixel;
	int bytesPerRow;
	int offsetToSpriteData = 60;

	switch(bpp)
	{
	case 32: bytesPerPixel = 4; break;
	case 16: bytesPerPixel = 2; break;
	case 8:
	    bytesPerPixel = 1;
	    offsetToSpriteData += 2048; /* Add in size of palette */
	    break;
	default:
		return NULL;
		break;
	}

	bytesPerRow = bytesPerPixel * width;

	if ((bytesPerRow & 3) != 0)
	{
		bytesPerRow += 4 - (bytesPerRow & 3);
	}
	size = bytesPerRow * height;

	buffer = SDL_malloc( (size_t) size + offsetToSpriteData );
	if (!buffer) return NULL;

   /* Initialise a sprite area */

	*(unsigned int *)buffer		= size + offsetToSpriteData;
	*(unsigned int *)(buffer + 8)	= 16;

	regs.r[0] = 256+9;
	regs.r[1] = (unsigned int)buffer;
   _kernel_swi(OS_SpriteOp, &regs, &regs);

	regs.r[0] = 256+15;
	regs.r[1] = (unsigned int)buffer;
	regs.r[2] = (unsigned int)&sprite_name;
	regs.r[3] = 0; /* Palette flag: 0 = no palette */
	regs.r[4] = width;
	regs.r[5] = height;
	if (bpp == 8)
	{
		/* Use old style mode number */
		regs.r[6] = 28; /* 8bpp 90x90dpi */
	} else
	{
		regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
					| (90 << 14) /* Vertical dpi */
					| (90 << 1)  /* Horizontal dpi */
					| 1; /* Marker to distinguish between mode selectors and sprite modes */
	}
   if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL)
   {
       if (bpp == 8)
       {
          /* Modify sprite to take into account 256 colour palette */
          int *sprite = (int *)(buffer + 16);
          /* Adjust sprite offsets */
          sprite[0] += 2048;
          sprite[8] += 2048;
          sprite[9] += 2048;
          /* Adjust sprite area next free pointer */
          (*(int *)(buffer+12)) += 2048;

          /* Don't need to set up palette as SDL sets up the default
             256 colour palette */
/*          {
             int *pal = sprite + 11;
             unsigned int j;
             unsigned int entry;
             for (j = 0; j < 255; j++)
             {
                entry = (j << 24) | (j << 16) | (j << 8);
                *pal++ = entry;
                *pal++ = entry;
             }
          }
*/
       }
   } else
   {
      SDL_free(buffer);
      buffer = NULL;
   }

   return buffer;
}


/* Setup translation buffers for the sprite plotting */

void WIMP_SetupPlotInfo(_THIS)
{
   _kernel_swi_regs regs;
   int *sprite = ((int *)this->hidden->bank[1])+4;

   regs.r[0] = (unsigned int)this->hidden->bank[1];
   regs.r[1] = (unsigned int)sprite;
   regs.r[2] = -1; /* Current mode */
   regs.r[3] = -1; /* Current palette */
   regs.r[4] = 0; /* Get size of buffer */
   regs.r[5] = 1|2|16; /* R1 - pointer to sprite and can use full palette words */
   regs.r[6] = 0;
   regs.r[7] = 0;

   if (this->hidden->pixtrans) SDL_free(this->hidden->pixtrans);
   this->hidden->pixtrans = 0;

   /* Get the size required for the buffer */
   _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
   if (regs.r[4])
   {
      this->hidden->pixtrans = SDL_malloc(regs.r[4]);
    
      regs.r[4] = (unsigned int)this->hidden->pixtrans;
      /* Actually read the buffer */
      _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
   }
}

/* Plot the sprite in the given context */
void WIMP_PlotSprite(_THIS, int x, int y)
{
   _kernel_swi_regs regs;
   _kernel_oserror *err;

   regs.r[0] =  52 + 512;
   regs.r[1] = (unsigned int)this->hidden->bank[1];
   regs.r[2] = (unsigned int)this->hidden->bank[1]+16;
   regs.r[3] = x;
   regs.r[4] = y;
   regs.r[5] = 0|32; /* Overwrite screen and pixtrans contains wide colour entries */
   regs.r[6] = 0; /* No scale factors i.e. 1:1 */
   regs.r[7] = (int)this->hidden->pixtrans;

   if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0)
   {
      int *p = (int *)this->hidden->pixtrans;
      printf("OS_SpriteOp failed \n%s\n",err->errmess);
      printf("pixtrans %d\n", (int)this->hidden->pixtrans);
      printf("%x %x %x\n", p[0], p[1], p[2]);
   }
}


/* Wimp mode has changes so update colour mapping and pixel sizes 
   of windows and the sprites they plot */

void WIMP_ModeChanged(_THIS)
{
	int oldXeig = this->hidden->xeig;
	int oldYeig = this->hidden->yeig;

	WIMP_ReadModeInfo(this);

	if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig)
	{
		/* Only need to update the palette */
		WIMP_PaletteChanged(this);
	} else
	{
		_kernel_swi_regs regs;
		int window_state[9];
		int extent[4];
		int currWidth, currHeight;
		int newWidth, newHeight;
		
		/* Need to resize windows and update the palette */
		WIMP_SetupPlotInfo(this);


		window_state[0] = this->hidden->window_handle;
		regs.r[1] = (unsigned int)window_state;
		_kernel_swi(Wimp_GetWindowState, &regs, &regs);
						
		currWidth = window_state[3] - window_state[1];
		currHeight = window_state[4] - window_state[2];
		
		newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
		newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
		/* Need to avoid extent getting too small for visible part
		of window */
		extent[0] = 0;
		if (currHeight <= newHeight)
		{
			extent[1] = -newHeight;
		} else
		{
			extent[1] = -currHeight;
		}
		if (currWidth <= newWidth)
		{
			extent[2] = newWidth;
		} else
		{
			extent[2] = currWidth;
		}
		extent[3] = 0;
		
		regs.r[0] = this->hidden->window_handle;
		regs.r[1] = (int)extent;
		_kernel_swi(Wimp_SetExtent, &regs, &regs);

		/*TODO: May need to set flag to resize window on next open */
	}
}

/* Palette has changed so update palettes used for windows sprites */

void WIMP_PaletteChanged(_THIS)
{
	WIMP_SetupPlotInfo(this);
}