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annotate src/video/riscos/SDL_riscossprite.c @ 1269:905d5b482f2a

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Some explanation on why SDL_RWFromFP doesn't always work on Win32
author Sam Lantinga <slouken@libsdl.org>
date Thu, 26 Jan 2006 06:10:34 +0000
parents 974ba6ae0fa3
children c9b51268668f
rev   line source
630
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
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1 /*
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Sam Lantinga <slouken@libsdl.org>
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
630
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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Sam Lantinga <slouken@libsdl.org>
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7 License as published by the Free Software Foundation; either
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
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8 version 2 of the License, or (at your option) any later version.
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Sam Lantinga <slouken@libsdl.org>
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9
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Sam Lantinga <slouken@libsdl.org>
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Sam Lantinga <slouken@libsdl.org>
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13 Library General Public License for more details.
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Sam Lantinga <slouken@libsdl.org>
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14
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
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15 You should have received a copy of the GNU Library General Public
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Sam Lantinga <slouken@libsdl.org>
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16 License along with this library; if not, write to the Free
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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Sam Lantinga <slouken@libsdl.org>
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20 slouken@devolution.com
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21 */
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22
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Sam Lantinga <slouken@libsdl.org>
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23 /*
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974ba6ae0fa3 Date: Wed, 26 Jan 2005 13:37:09 GMT
Sam Lantinga <slouken@libsdl.org>
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24 File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
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25 27 March 2003
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26
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27 Implements Sprite plotting code for wimp display.window
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28 */
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29
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30 #include <stdlib.h>
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31 #include "kernel.h"
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Sam Lantinga <slouken@libsdl.org>
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32 #include "swis.h"
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33 #include "SDL_riscosvideo.h"
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34
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35 extern void WIMP_ReadModeInfo(_THIS);
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36
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Sam Lantinga <slouken@libsdl.org>
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37 void WIMP_PaletteChanged(_THIS);
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38
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39
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40 /* Create sprite buffer for screen */
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41
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42 unsigned char *WIMP_CreateBuffer(int width, int height, int bpp)
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43 {
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44 int size;
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45 char sprite_name[12] = "display";
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46 unsigned char *buffer;
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47 _kernel_swi_regs regs;
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48 int bytesPerPixel;
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49 int bytesPerRow;
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50 int offsetToSpriteData = 60;
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51
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52 switch(bpp)
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53 {
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54 case 32: bytesPerPixel = 4; break;
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55 case 16: bytesPerPixel = 2; break;
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56 case 8:
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57 bytesPerPixel = 1;
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58 offsetToSpriteData += 2048; /* Add in size of palette */
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59 break;
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60 default:
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61 return NULL;
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62 break;
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63 }
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64
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65 bytesPerRow = bytesPerPixel * width;
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66
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67 if ((bytesPerRow & 3) != 0)
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68 {
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69 bytesPerRow += 4 - (bytesPerRow & 3);
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70 }
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71 size = bytesPerRow * height;
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72
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73 buffer = malloc( (size_t) size + offsetToSpriteData );
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74 if (!buffer) return NULL;
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75
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76 /* Initialise a sprite area */
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77
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78 *(unsigned int *)buffer = size + offsetToSpriteData;
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79 *(unsigned int *)(buffer + 8) = 16;
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80
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81 regs.r[0] = 256+9;
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82 regs.r[1] = (unsigned int)buffer;
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83 _kernel_swi(OS_SpriteOp, &regs, &regs);
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84
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85 regs.r[0] = 256+15;
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86 regs.r[1] = (unsigned int)buffer;
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87 regs.r[2] = (unsigned int)&sprite_name;
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88 regs.r[3] = 0; /* Palette flag: 0 = no palette */
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89 regs.r[4] = width;
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90 regs.r[5] = height;
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91 if (bpp == 8)
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92 {
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93 /* Use old style mode number */
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94 regs.r[6] = 28; /* 8bpp 90x90dpi */
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95 } else
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96 {
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97 regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
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98 | (90 << 14) /* Vertical dpi */
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99 | (90 << 1) /* Horizontal dpi */
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100 | 1; /* Marker to distinguish between mode selectors and sprite modes */
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101 }
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102 if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL)
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103 {
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104 if (bpp == 8)
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105 {
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106 /* Modify sprite to take into account 256 colour palette */
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107 int *sprite = (int *)(buffer + 16);
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108 /* Adjust sprite offsets */
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109 sprite[0] += 2048;
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110 sprite[8] += 2048;
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111 sprite[9] += 2048;
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112 /* Adjust sprite area next free pointer */
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113 (*(int *)(buffer+12)) += 2048;
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114
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115 /* Don't need to set up palette as SDL sets up the default
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116 256 colour palette */
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117 /* {
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118 int *pal = sprite + 11;
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119 unsigned int j;
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120 unsigned int entry;
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121 for (j = 0; j < 255; j++)
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122 {
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123 entry = (j << 24) | (j << 16) | (j << 8);
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124 *pal++ = entry;
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125 *pal++ = entry;
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126 }
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127 }
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128 */
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129 }
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130 } else
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131 {
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132 free(buffer);
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133 buffer = NULL;
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134 }
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135
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136 return buffer;
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137 }
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138
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139
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140 /* Setup translation buffers for the sprite plotting */
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141
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142 void WIMP_SetupPlotInfo(_THIS)
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143 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
144 _kernel_swi_regs regs;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145 int *sprite = ((int *)this->hidden->bank[1])+4;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
146
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
147 regs.r[0] = (unsigned int)this->hidden->bank[1];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
148 regs.r[1] = (unsigned int)sprite;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
149 regs.r[2] = -1; /* Current mode */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
150 regs.r[3] = -1; /* Current palette */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
151 regs.r[4] = 0; /* Get size of buffer */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
152 regs.r[5] = 1|2|16; /* R1 - pointer to sprite and can use full palette words */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
153 regs.r[6] = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154 regs.r[7] = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 if (this->hidden->pixtrans) free(this->hidden->pixtrans);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
157 this->hidden->pixtrans = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
158
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
159 /* Get the size required for the buffer */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
160 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161 if (regs.r[4])
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
162 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
163 this->hidden->pixtrans = malloc(regs.r[4]);
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parents:
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164
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
165 regs.r[4] = (unsigned int)this->hidden->pixtrans;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 /* Actually read the buffer */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
167 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
168 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
169 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171 /* Plot the sprite in the given context */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
172 void WIMP_PlotSprite(_THIS, int x, int y)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
174 _kernel_swi_regs regs;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 _kernel_oserror *err;
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Sam Lantinga <slouken@libsdl.org>
parents:
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176
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 regs.r[0] = 52 + 512;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178 regs.r[1] = (unsigned int)this->hidden->bank[1];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 regs.r[2] = (unsigned int)this->hidden->bank[1]+16;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
180 regs.r[3] = x;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
181 regs.r[4] = y;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
182 regs.r[5] = 0|32; /* Overwrite screen and pixtrans contains wide colour entries */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
183 regs.r[6] = 0; /* No scale factors i.e. 1:1 */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
184 regs.r[7] = (int)this->hidden->pixtrans;
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Sam Lantinga <slouken@libsdl.org>
parents:
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185
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
186 if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
188 int *p = (int *)this->hidden->pixtrans;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
189 printf("OS_SpriteOp failed \n%s\n",err->errmess);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190 printf("pixtrans %d\n", (int)this->hidden->pixtrans);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
191 printf("%x %x %x\n", p[0], p[1], p[2]);
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Sam Lantinga <slouken@libsdl.org>
parents:
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192 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
193 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196 /* Wimp mode has changes so update colour mapping and pixel sizes
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 of windows and the sprites they plot */
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Sam Lantinga <slouken@libsdl.org>
parents:
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198
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199 void WIMP_ModeChanged(_THIS)
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
200 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 int oldXeig = this->hidden->xeig;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202 int oldYeig = this->hidden->yeig;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 WIMP_ReadModeInfo(this);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206 if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 /* Only need to update the palette */
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
209 WIMP_PaletteChanged(this);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 } else
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 _kernel_swi_regs regs;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
213 int window_state[9];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214 int extent[4];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 int currWidth, currHeight;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 int newWidth, newHeight;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 /* Need to resize windows and update the palette */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 WIMP_SetupPlotInfo(this);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
221
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 window_state[0] = this->hidden->window_handle;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 regs.r[1] = (unsigned int)window_state;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224 _kernel_swi(Wimp_GetWindowState, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226 currWidth = window_state[3] - window_state[1];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227 currHeight = window_state[4] - window_state[2];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229 newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230 newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 /* Need to avoid extent getting too small for visible part
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 of window */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 extent[0] = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 if (currHeight <= newHeight)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 extent[1] = -newHeight;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 } else
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 extent[1] = -currHeight;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 if (currWidth <= newWidth)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 extent[2] = newWidth;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 } else
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 extent[2] = currWidth;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 extent[3] = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 regs.r[0] = this->hidden->window_handle;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 regs.r[1] = (int)extent;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 _kernel_swi(Wimp_SetExtent, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 /*TODO: May need to set flag to resize window on next open */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 /* Palette has changed so update palettes used for windows sprites */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260 void WIMP_PaletteChanged(_THIS)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
261 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 WIMP_SetupPlotInfo(this);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 }