annotate src/video/riscos/SDL_riscossprite.c @ 3473:7bdc10624cba

This is terrible, but the OpenGL standard says that lines are half open, which means that one endpoint is not covered so adjoining lines don't overlap. It also doesn't define which end is open, and indeed Mac OS X and Linux differ. Mac OS X seems to leave the second endpoint open, but Linux uses the right-most endpoint for x major lines and the bottom-most endpoint for y major lines.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 07:14:21 +0000
parents 99210400e8b9
children f7b03b6838cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
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26 27 March 2003
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27
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28 Implements Sprite plotting code for wimp display.window
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29 */
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30
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31 #include "kernel.h"
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32 #include "swis.h"
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33
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34 #include "SDL_stdinc.h"
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35 #include "SDL_riscosvideo.h"
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36
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37 extern void WIMP_ReadModeInfo(_THIS);
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38
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39 void WIMP_PaletteChanged(_THIS);
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40
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41
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42 /* Create sprite buffer for screen */
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43
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44 unsigned char *
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45 WIMP_CreateBuffer(int width, int height, int bpp)
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46 {
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47 int size;
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48 char sprite_name[12] = "display";
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49 unsigned char *buffer;
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50 _kernel_swi_regs regs;
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51 int bytesPerPixel;
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52 int bytesPerRow;
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53 int offsetToSpriteData = 60;
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54
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55 switch (bpp) {
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56 case 32:
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57 bytesPerPixel = 4;
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58 break;
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59 case 16:
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60 bytesPerPixel = 2;
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61 break;
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62 case 8:
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63 bytesPerPixel = 1;
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64 offsetToSpriteData += 2048; /* Add in size of palette */
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65 break;
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66 default:
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67 return NULL;
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68 break;
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69 }
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70
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71 bytesPerRow = bytesPerPixel * width;
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72
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73 if ((bytesPerRow & 3) != 0) {
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74 bytesPerRow += 4 - (bytesPerRow & 3);
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75 }
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76 size = bytesPerRow * height;
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77
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78 buffer = SDL_malloc((size_t) size + offsetToSpriteData);
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79 if (!buffer)
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80 return NULL;
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81
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82 /* Initialise a sprite area */
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83
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84 *(unsigned int *) buffer = size + offsetToSpriteData;
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85 *(unsigned int *) (buffer + 8) = 16;
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86
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87 regs.r[0] = 256 + 9;
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88 regs.r[1] = (unsigned int) buffer;
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89 _kernel_swi(OS_SpriteOp, &regs, &regs);
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90
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91 regs.r[0] = 256 + 15;
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92 regs.r[1] = (unsigned int) buffer;
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93 regs.r[2] = (unsigned int) &sprite_name;
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94 regs.r[3] = 0; /* Palette flag: 0 = no palette */
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95 regs.r[4] = width;
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96 regs.r[5] = height;
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97 if (bpp == 8) {
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98 /* Use old style mode number */
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99 regs.r[6] = 28; /* 8bpp 90x90dpi */
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100 } else {
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101 regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
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102 |(90 << 14) /* Vertical dpi */
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103 |(90 << 1) /* Horizontal dpi */
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104 |1; /* Marker to distinguish between mode selectors and sprite modes */
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105 }
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106 if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL) {
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107 if (bpp == 8) {
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108 /* Modify sprite to take into account 256 colour palette */
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109 int *sprite = (int *) (buffer + 16);
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110 /* Adjust sprite offsets */
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111 sprite[0] += 2048;
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112 sprite[8] += 2048;
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113 sprite[9] += 2048;
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114 /* Adjust sprite area next free pointer */
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115 (*(int *) (buffer + 12)) += 2048;
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116
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117 /* Don't need to set up palette as SDL sets up the default
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118 256 colour palette */
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119 /* {
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120 int *pal = sprite + 11;
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121 unsigned int j;
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122 unsigned int entry;
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123 for (j = 0; j < 255; j++)
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124 {
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125 entry = (j << 24) | (j << 16) | (j << 8);
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126 *pal++ = entry;
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127 *pal++ = entry;
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128 }
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129 }
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130 */
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131 }
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132 } else {
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133 SDL_free(buffer);
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134 buffer = NULL;
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135 }
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136
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137 return buffer;
630
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138 }
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139
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140
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141 /* Setup translation buffers for the sprite plotting */
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142
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143 void
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144 WIMP_SetupPlotInfo(_THIS)
630
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145 {
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146 _kernel_swi_regs regs;
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147 int *sprite = ((int *) this->hidden->bank[1]) + 4;
630
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148
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149 regs.r[0] = (unsigned int) this->hidden->bank[1];
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150 regs.r[1] = (unsigned int) sprite;
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151 regs.r[2] = -1; /* Current mode */
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152 regs.r[3] = -1; /* Current palette */
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153 regs.r[4] = 0; /* Get size of buffer */
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154 regs.r[5] = 1 | 2 | 16; /* R1 - pointer to sprite and can use full palette words */
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155 regs.r[6] = 0;
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156 regs.r[7] = 0;
630
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157
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158 if (this->hidden->pixtrans)
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159 SDL_free(this->hidden->pixtrans);
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160 this->hidden->pixtrans = 0;
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161
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162 /* Get the size required for the buffer */
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163 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
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164 if (regs.r[4]) {
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165 this->hidden->pixtrans = SDL_malloc(regs.r[4]);
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166
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167 regs.r[4] = (unsigned int) this->hidden->pixtrans;
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168 /* Actually read the buffer */
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169 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
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170 }
630
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171 }
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172
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173 /* Plot the sprite in the given context */
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174 void
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175 WIMP_PlotSprite(_THIS, int x, int y)
630
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176 {
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177 _kernel_swi_regs regs;
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178 _kernel_oserror *err;
630
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179
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180 regs.r[0] = 52 + 512;
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181 regs.r[1] = (unsigned int) this->hidden->bank[1];
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182 regs.r[2] = (unsigned int) this->hidden->bank[1] + 16;
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183 regs.r[3] = x;
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184 regs.r[4] = y;
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185 regs.r[5] = 0 | 32; /* Overwrite screen and pixtrans contains wide colour entries */
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186 regs.r[6] = 0; /* No scale factors i.e. 1:1 */
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187 regs.r[7] = (int) this->hidden->pixtrans;
630
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188
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189 if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0) {
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190 int *p = (int *) this->hidden->pixtrans;
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191 printf("OS_SpriteOp failed \n%s\n", err->errmess);
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192 printf("pixtrans %d\n", (int) this->hidden->pixtrans);
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193 printf("%x %x %x\n", p[0], p[1], p[2]);
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194 }
630
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195 }
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196
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197
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198 /* Wimp mode has changes so update colour mapping and pixel sizes
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199 of windows and the sprites they plot */
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200
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201 void
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202 WIMP_ModeChanged(_THIS)
630
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203 {
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204 int oldXeig = this->hidden->xeig;
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205 int oldYeig = this->hidden->yeig;
630
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206
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207 WIMP_ReadModeInfo(this);
630
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diff changeset
208
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209 if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig) {
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210 /* Only need to update the palette */
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211 WIMP_PaletteChanged(this);
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diff changeset
212 } else {
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213 _kernel_swi_regs regs;
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214 int window_state[9];
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215 int extent[4];
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diff changeset
216 int currWidth, currHeight;
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diff changeset
217 int newWidth, newHeight;
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diff changeset
218
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diff changeset
219 /* Need to resize windows and update the palette */
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220 WIMP_SetupPlotInfo(this);
630
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221
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
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parents:
diff changeset
222
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223 window_state[0] = this->hidden->window_handle;
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diff changeset
224 regs.r[1] = (unsigned int) window_state;
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225 _kernel_swi(Wimp_GetWindowState, &regs, &regs);
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diff changeset
226
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227 currWidth = window_state[3] - window_state[1];
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228 currHeight = window_state[4] - window_state[2];
630
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229
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230 newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
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231 newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
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diff changeset
232 /* Need to avoid extent getting too small for visible part
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diff changeset
233 of window */
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diff changeset
234 extent[0] = 0;
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diff changeset
235 if (currHeight <= newHeight) {
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diff changeset
236 extent[1] = -newHeight;
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diff changeset
237 } else {
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diff changeset
238 extent[1] = -currHeight;
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diff changeset
239 }
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diff changeset
240 if (currWidth <= newWidth) {
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diff changeset
241 extent[2] = newWidth;
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diff changeset
242 } else {
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diff changeset
243 extent[2] = currWidth;
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diff changeset
244 }
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parents: 1402
diff changeset
245 extent[3] = 0;
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parents: 1402
diff changeset
246
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Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
247 regs.r[0] = this->hidden->window_handle;
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parents: 1402
diff changeset
248 regs.r[1] = (int) extent;
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diff changeset
249 _kernel_swi(Wimp_SetExtent, &regs, &regs);
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diff changeset
250
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
251 /*TODO: May need to set flag to resize window on next open */
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diff changeset
252 }
630
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 }
550bccdf04bd Added initial support for RISC OS (thanks Peter Naulls!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254
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255 /* Palette has changed so update palettes used for windows sprites */
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256
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257 void
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258 WIMP_PaletteChanged(_THIS)
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259 {
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260 WIMP_SetupPlotInfo(this);
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261 }
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262
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263 /* vi: set ts=4 sw=4 expandtab: */