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comparison src/video/riscos/SDL_riscossprite.c @ 630:550bccdf04bd

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Added initial support for RISC OS (thanks Peter Naulls!)
author Sam Lantinga <slouken@libsdl.org>
date Thu, 29 May 2003 04:44:13 +0000
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children b8d311d90021
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629:3fa401bb4bb5 630:550bccdf04bd
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
21 */
22
23 /*
24 File added by Alan Buckley (alan_baa@hotmail.com) for RISCOS compatability
25 27 March 2003
26
27 Implements Sprite plotting code for wimp display.window
28 */
29
30 #include <stdlib.h>
31 #include "kernel.h"
32 #include "swis.h"
33 #include "SDL_riscosvideo.h"
34
35 extern void WIMP_ReadModeInfo(_THIS);
36
37 void WIMP_PaletteChanged(_THIS);
38
39
40 /* Create sprite buffer for screen */
41
42 unsigned char *WIMP_CreateBuffer(int width, int height, int bpp)
43 {
44 int size;
45 char sprite_name[12] = "display";
46 unsigned char *buffer;
47 _kernel_swi_regs regs;
48 int bytesPerPixel;
49 int bytesPerRow;
50 int offsetToSpriteData = 60;
51
52 switch(bpp)
53 {
54 case 32: bytesPerPixel = 4; break;
55 case 16: bytesPerPixel = 2; break;
56 case 8:
57 bytesPerPixel = 1;
58 offsetToSpriteData += 2048; /* Add in size of palette */
59 break;
60 default:
61 return NULL;
62 break;
63 }
64
65 bytesPerRow = bytesPerPixel * width;
66
67 if ((bytesPerRow & 3) != 0)
68 {
69 bytesPerRow += 4 - (bytesPerRow & 3);
70 }
71 size = bytesPerRow * height;
72
73 buffer = malloc( (size_t) size + offsetToSpriteData );
74 if (!buffer) return NULL;
75
76 /* Initialise a sprite area */
77
78 *(unsigned int *)buffer = size + offsetToSpriteData;
79 *(unsigned int *)(buffer + 8) = 16;
80
81 regs.r[0] = 256+9;
82 regs.r[1] = (unsigned int)buffer;
83 _kernel_swi(OS_SpriteOp, &regs, &regs);
84
85 regs.r[0] = 256+15;
86 regs.r[1] = (unsigned int)buffer;
87 regs.r[2] = (unsigned int)&sprite_name;
88 regs.r[3] = 0; /* Palette flag: 0 = no palette */
89 regs.r[4] = width;
90 regs.r[5] = height;
91 if (bpp == 8)
92 {
93 /* Use old style mode number */
94 regs.r[6] = 28; /* 8bpp 90x90dpi */
95 } else
96 {
97 regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
98 | (90 << 14) /* Vertical dpi */
99 | (90 << 1) /* Horizontal dpi */
100 | 1; /* Marker to distinguish between mode selectors and sprite modes */
101 }
102 if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL)
103 {
104 if (bpp == 8)
105 {
106 /* Modify sprite to take into account 256 colour palette */
107 int *sprite = (int *)(buffer + 16);
108 /* Adjust sprite offsets */
109 sprite[0] += 2048;
110 sprite[8] += 2048;
111 sprite[9] += 2048;
112 /* Adjust sprite area next free pointer */
113 (*(int *)(buffer+12)) += 2048;
114
115 /* Don't need to set up palette as SDL sets up the default
116 256 colour palette */
117 /* {
118 int *pal = sprite + 11;
119 unsigned int j;
120 unsigned int entry;
121 for (j = 0; j < 255; j++)
122 {
123 entry = (j << 24) | (j << 16) | (j << 8);
124 *pal++ = entry;
125 *pal++ = entry;
126 }
127 }
128 */
129 }
130 } else
131 {
132 free(buffer);
133 buffer = NULL;
134 }
135
136 return buffer;
137 }
138
139
140 /* Setup translation buffers for the sprite plotting */
141
142 void WIMP_SetupPlotInfo(_THIS)
143 {
144 _kernel_swi_regs regs;
145 int *sprite = ((int *)this->hidden->bank[1])+4;
146
147 regs.r[0] = (unsigned int)this->hidden->bank[1];
148 regs.r[1] = (unsigned int)sprite;
149 regs.r[2] = -1; /* Current mode */
150 regs.r[3] = -1; /* Current palette */
151 regs.r[4] = 0; /* Get size of buffer */
152 regs.r[5] = 1|2|16; /* R1 - pointer to sprite and can use full palette words */
153 regs.r[6] = 0;
154 regs.r[7] = 0;
155
156 if (this->hidden->pixtrans) free(this->hidden->pixtrans);
157 this->hidden->pixtrans = 0;
158
159 /* Get the size required for the buffer */
160 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
161 if (regs.r[4])
162 {
163 this->hidden->pixtrans = malloc(regs.r[4]);
164
165 regs.r[4] = (unsigned int)this->hidden->pixtrans;
166 /* Actually read the buffer */
167 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
168 }
169 }
170
171 /* Plot the sprite in the given context */
172 void WIMP_PlotSprite(_THIS, int x, int y)
173 {
174 _kernel_swi_regs regs;
175 _kernel_oserror *err;
176
177 regs.r[0] = 52 + 512;
178 regs.r[1] = (unsigned int)this->hidden->bank[1];
179 regs.r[2] = (unsigned int)this->hidden->bank[1]+16;
180 regs.r[3] = x;
181 regs.r[4] = y;
182 regs.r[5] = 0|32; /* Overwrite screen and pixtrans contains wide colour entries */
183 regs.r[6] = 0; /* No scale factors i.e. 1:1 */
184 regs.r[7] = (int)this->hidden->pixtrans;
185
186 if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0)
187 {
188 int *p = (int *)this->hidden->pixtrans;
189 printf("OS_SpriteOp failed \n%s\n",err->errmess);
190 printf("pixtrans %d\n", (int)this->hidden->pixtrans);
191 printf("%x %x %x\n", p[0], p[1], p[2]);
192 }
193 }
194
195
196 /* Wimp mode has changes so update colour mapping and pixel sizes
197 of windows and the sprites they plot */
198
199 void WIMP_ModeChanged(_THIS)
200 {
201 int oldXeig = this->hidden->xeig;
202 int oldYeig = this->hidden->yeig;
203
204 WIMP_ReadModeInfo(this);
205
206 if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig)
207 {
208 /* Only need to update the palette */
209 WIMP_PaletteChanged(this);
210 } else
211 {
212 _kernel_swi_regs regs;
213 int window_state[9];
214 int extent[4];
215 int currWidth, currHeight;
216 int newWidth, newHeight;
217
218 /* Need to resize windows and update the palette */
219 WIMP_SetupPlotInfo(this);
220
221
222 window_state[0] = this->hidden->window_handle;
223 regs.r[1] = (unsigned int)window_state;
224 _kernel_swi(Wimp_GetWindowState, &regs, &regs);
225
226 currWidth = window_state[3] - window_state[1];
227 currHeight = window_state[4] - window_state[2];
228
229 newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
230 newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
231 /* Need to avoid extent getting too small for visible part
232 of window */
233 extent[0] = 0;
234 if (currHeight <= newHeight)
235 {
236 extent[1] = -newHeight;
237 } else
238 {
239 extent[1] = -currHeight;
240 }
241 if (currWidth <= newWidth)
242 {
243 extent[2] = newWidth;
244 } else
245 {
246 extent[2] = currWidth;
247 }
248 extent[3] = 0;
249
250 regs.r[0] = this->hidden->window_handle;
251 regs.r[1] = (int)extent;
252 _kernel_swi(Wimp_SetExtent, &regs, &regs);
253
254 /*TODO: May need to set flag to resize window on next open */
255 }
256 }
257
258 /* Palette has changed so update palettes used for windows sprites */
259
260 void WIMP_PaletteChanged(_THIS)
261 {
262 WIMP_SetupPlotInfo(this);
263 }