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annotate src/video/riscos/SDL_riscossprite.c @ 1240:3b8a43c428bb

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From Bug #36: There are a couple of issues with the selection of Altivec alpha-blitting routines in CalculateAlphaBlit() in src/video/SDL_Blit_A.c. 1) There's no check for the presence of Altivec when checking if the Blit32to565PixelAlphaAltivec() routine can be selected. 2) Altivec cannot be used in video memory, and there's no check if the destination surface is a hardware surface. (Alpha-blitting to a hardware surface with GPU support is a bad idea, but somebody's bound to do it anyway.) Patch to fix these attached.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 08 Jan 2006 21:18:15 +0000
parents 974ba6ae0fa3
children c9b51268668f
rev   line source
630
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1 /*
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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
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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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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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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
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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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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20 slouken@devolution.com
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21 */
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22
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23 /*
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974ba6ae0fa3 Date: Wed, 26 Jan 2005 13:37:09 GMT
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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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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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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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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
142 void WIMP_SetupPlotInfo(_THIS)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
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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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>
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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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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:
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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:
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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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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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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>
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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>
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diff changeset
201 int oldXeig = this->hidden->xeig;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
202 int oldYeig = this->hidden->yeig;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
203
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
204 WIMP_ReadModeInfo(this);
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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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diff changeset
207 {
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Sam Lantinga <slouken@libsdl.org>
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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>
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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>
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diff changeset
213 int window_state[9];
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Sam Lantinga <slouken@libsdl.org>
parents:
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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>
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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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parents:
diff changeset
224 _kernel_swi(Wimp_GetWindowState, &regs, &regs);
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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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parents:
diff changeset
227 currHeight = window_state[4] - window_state[2];
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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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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 }