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 (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, ®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 */ 143 144 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 */ 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 */ 200 201 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 */ 261 262 void WIMP_PaletteChanged(_THIS) 263 { 264 WIMP_SetupPlotInfo(this); 265 } 266
