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annotate src/video/nds/SDL_ndsvideo.c @ 2671:c3e7c0698cbb gsoc2008_nds

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some changes to the dummy driver for debug purposes that should be reverted. most importantly, commenting out a check for an env. var.
author Darren Alton <dalton@stevens.edu>
date Thu, 12 Jun 2008 02:38:49 +0000
parents 6e4669f4db49
children 74ac057679d5
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 /* Dummy SDL video driver implementation; this is just enough to make an
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25 * SDL-based application THINK it's got a working video driver, for
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26 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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27 * and also for use as a collection of stubs when porting SDL to a new
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28 * platform for which you haven't yet written a valid video driver.
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29 *
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30 * This is also a great way to determine bottlenecks: if you think that SDL
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31 * is a performance problem for a given platform, enable this driver, and
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32 * then see if your application runs faster without video overhead.
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33 *
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34 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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35 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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36 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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37 */
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38
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39 #include <stdio.h>
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40 #include <stdlib.h>
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41 #include <nds.h>
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42
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43 #include "SDL_video.h"
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44 #include "SDL_mouse.h"
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45 #include "../SDL_sysvideo.h"
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46 #include "../SDL_pixels_c.h"
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47 #include "../../events/SDL_events_c.h"
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48
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49 #include "SDL_ndsvideo.h"
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50 #include "SDL_ndsevents_c.h"
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51 #include "SDL_ndsrender_c.h"
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52
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53 #define NDSVID_DRIVER_NAME "nds"
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54
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55 /* Initialization/Query functions */
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56 static int NDS_VideoInit(_THIS);
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57 static int NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode);
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58 static void NDS_VideoQuit(_THIS);
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59
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60 /* DUMMY driver bootstrap functions */
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61
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62 static int
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63 NDS_Available(void)
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64 {
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65 const char *envr = SDL_getenv("SDL_VIDEODRIVER");
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66 printf("NDS_Available()\n");
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67 return (1);
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68 }
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69
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70 static void
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71 NDS_DeleteDevice(SDL_VideoDevice * device)
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72 {
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73 SDL_free(device);
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74 }
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75
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76 static SDL_VideoDevice *
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77 NDS_CreateDevice(int devindex)
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78 {
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79 SDL_VideoDevice *device;
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80 printf("NDS_CreateDevice(%d)\n", devindex);
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81
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82 /* Initialize all variables that we clean on shutdown */
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83 device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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84 if (!device) {
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85 SDL_OutOfMemory();
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86 if (device) {
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87 SDL_free(device);
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88 }
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89 return (0);
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90 }
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91
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92 /* Set the function pointers */
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93 device->VideoInit = NDS_VideoInit;
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94 device->VideoQuit = NDS_VideoQuit;
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95 device->SetDisplayMode = NDS_SetDisplayMode;
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96 device->PumpEvents = NDS_PumpEvents;
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97
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98 device->num_displays = 2; /* DS = dual screens */
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99
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100 device->free = NDS_DeleteDevice;
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101
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102 return device;
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103 }
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104
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105 VideoBootStrap NDS_bootstrap = {
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106 NDSVID_DRIVER_NAME, "SDL NDS video driver",
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107 NDS_Available, NDS_CreateDevice
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108 };
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109
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110 int
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111 NDS_VideoInit(_THIS)
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112 {
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113 SDL_DisplayMode mode;
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114 int i;
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115
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116 /* simple 256x192x16x60 for now */
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117 mode.w = 256;
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118 mode.h = 192;
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119 mode.format = SDL_PIXELFORMAT_ARGB1555;
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120 mode.refresh_rate = 60;
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121 mode.driverdata = NULL;
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122
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123 SDL_AddBasicVideoDisplay(&mode);
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124 SDL_AddRenderDriver(0, &SDL_NDS_RenderDriver);
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125
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126 SDL_zero(mode);
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127 SDL_AddDisplayMode(0, &mode);
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128
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129 /* hackish stuff to get things up and running for now, and for a console */
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130 powerON(POWER_ALL);
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131 videoSetMode(MODE_FB0);
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132 videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE); /* debug text on sub */
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133
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134 vramSetBankA(VRAM_A_LCD);
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135 vramSetBankC(VRAM_C_SUB_BG);
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136
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137 irqInit();
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138 irqEnable(IRQ_VBLANK);
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139 /* set up console for debug text 'n stuff */
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140 SUB_BG0_CR = BG_MAP_BASE(31);
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141 BG_PALETTE_SUB[255] = RGB15(31, 31, 31);
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142 consoleInitDefault((u16 *) SCREEN_BASE_BLOCK_SUB(31),
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143 (u16 *) CHAR_BASE_BLOCK_SUB(0), 16);
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144 for (i = 0; i < 256 * 192; ++i) {
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145 ((u16 *) VRAM_A)[i] = i;
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146 }
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147 for (i = 0; i < 60; ++i)
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148 swiWaitForVBlank();
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149
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150 /*NDS_SetDisplayMode(_this, &mode); */
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151 return 0;
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152 }
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153
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154 static int
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155 NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
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156 {
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157 /* right now this function is just hard-coded for 256x192 ARGB1555 */
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158 #if 0
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159 videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE); /* display on main core */
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160 videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE); /* debug text on sub */
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161 vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000, VRAM_B_LCD,
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162 VRAM_C_SUB_BG, VRAM_D_LCD);
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163
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164 /* maps well to the 256x192 screen anyway. note: need VRAM_B for bigger */
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165 BG3_CR = BG_BMP16_256x256;
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166 /* affine transformation matrix. nothing too fancy here */
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167 BG3_XDX = 0x100;
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168 BG3_XDY = 0;
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169 BG3_YDX = 0;
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170 BG3_YDY = 0x100;
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171 /* x/y position */
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172 BG3_CX = 0;
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173 BG3_CY = 0;
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174 #endif
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175 return 0;
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176 }
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177
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178 void
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179 NDS_VideoQuit(_THIS)
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180 {
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181 }