1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2004 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@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 /*
25 File added by Alan Buckley (alan_baa@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
WIMP_CreateBuffer(int width,int height,int bpp)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, ®s, ®s);
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, ®s, ®s) == 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
WIMP_SetupPlotInfo(_THIS)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, ®s, ®s);
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, ®s, ®s);
170 }
171 }
172
173 /* Plot the sprite in the given context */
WIMP_PlotSprite(_THIS,int x,int y)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, ®s, ®s)) != 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
WIMP_ModeChanged(_THIS)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, ®s, ®s);
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, ®s, ®s);
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
WIMP_PaletteChanged(_THIS)262 void WIMP_PaletteChanged(_THIS)
263 {
264 WIMP_SetupPlotInfo(this);
265 }
266