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annotate Xcode/TemplatesForProjectBuilder/SDL Custom Cocoa Application/MyController.m @ 3089:0ea7b6bb4054

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Fixed potential double-free crash
author Sam Lantinga <slouken@libsdl.org>
date Fri, 06 Mar 2009 05:53:33 +0000
parents d63e9f5944ae
children
rev   line source
2207
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1 //
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2 // MyController.m
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3 // SDL Custom Cocoa App
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4 //
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5 // Created by Darrell Walisser on Fri Jul 18 2003.
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6 // Copyright (c) 2003 __MyCompanyName__. All rights reserved.
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7 //
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8
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9 #import "MyController.h"
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10 #import "SDL.h"
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11
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12 id gController;
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13
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14 @implementation MyController
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15
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16 - (id)init
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17 {
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18 self = [ super init ];
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19 if (self) {
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20
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21 _nSprites = 10;
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22 _max_speed = 4;
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23 _doFlip = 0;
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24 _mem = NULL;
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25 _screen = NULL;
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26 _sprite_rects = NULL;
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27 _positions = NULL;
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28 _velocities = NULL;
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29 _sprites_visible = 1;
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30 _sprite_w = 0;
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31 _sprite_h = 0;
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32 _mouse_x = 0;
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33 _mouse_y = 0;
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34 }
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35
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36 return self;
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37 }
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38
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39 - (void)setupCocoaWindow
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40 {
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41 // If you want the close button to send SDL_Quit,
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42 // you can attach the SDL_QuartzWindowDelegate to the window
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43 [ _window setDelegate:
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44 [ [ [ SDL_QuartzWindowDelegate alloc ] init ] autorelease ] ];
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45
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46 // Make the window visible and the frontmost window
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47 [ _window makeKeyAndOrderFront:nil ];
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48
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49 // Make the window accept passive motion events (when the button is released)
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50 [ _window setAcceptsMouseMovedEvents:YES ];
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51 }
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52
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53 - (void)setCocoaEnvironmentVariables
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54 {
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55 // Export cocoa objects to environment
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56 // SDL will use these when you call SDL_SetVideoMode
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57
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58 // The window must be visible when you call SDL_SetVideoMode,
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59 // and the view must lie completely within the window.
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60 //
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61 // The width and height passed to SDL_SetVideoMode should match
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62 // the width/height of the view (the window can be any size)
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63 //
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64 // For resizing to work, you must set the appropriate
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65 // attributes on the window and view. Then the SDL_RESIZABLE
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66 // flag will be set automatically
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67 //
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68 // SDL will retain a reference to the window, and
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69 // will release it when unsetting the video mode
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70 //
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71 // The view is not retained (the window object manages this).
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72 //
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73 char buffer[256];
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74 printf ("NSWindow=%p\n", _window);
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75 sprintf (buffer, "%d", (int)_window);
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76 setenv ("SDL_NSWindowPointer", buffer, 1);
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77
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78 printf ("NSQuickDrawView=%p\n", _view);
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79 sprintf (buffer, "%d", (int)_view);
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80 setenv ("SDL_NSQuickDrawViewPointer", buffer, 1);
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81
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82 // Also tell SDL to pass keyboard events to Cocoa
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83 // In this case, Cocoa will get the event before SDL_PollEvent returns it
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84 // Note that mouse events (button, motion) will always be passed, regardless of this setting
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85 setenv ("SDL_ENABLEAPPEVENTS", "1", 1);
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86 }
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87
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88 - (void)printFlags:(Uint32)flags withName:(const char*)name
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89 {
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90 printf ("%s", name);
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91
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92 if (flags & SDL_SWSURFACE)
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93 printf (" - SDL_SWSURFACE");
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94 if (flags & SDL_HWSURFACE)
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95 printf (" - SDL_HWSURFACE");
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96 if (flags & SDL_ASYNCBLIT)
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97 printf (" - SDL_ASYNCBLIT");
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98 if (flags & SDL_ANYFORMAT)
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99 printf (" - SDL_ANYFORMAT");
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100 if (flags & SDL_HWPALETTE)
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101 printf (" - SDL_HWPALETTE");
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102 if (flags & SDL_DOUBLEBUF)
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103 printf (" - SDL_DOUBLEBUF");
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104 if (flags & SDL_FULLSCREEN)
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105 printf (" - SDL_FULLSCREEN");
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106 if (flags & SDL_OPENGL)
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107 printf (" - SDL_OPENGL");
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108 if (flags & SDL_OPENGLBLIT)
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109 printf (" - SDL_OPENGLBLIT");
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110 if (flags & SDL_RESIZABLE)
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111 printf (" - SDL_RESIZABLE");
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112 if (flags & SDL_NOFRAME)
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113 printf (" - SDL_NOFRAME");
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114
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115 printf ("\n");
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116 }
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117 // This is a way of telling whether or not to use hardware surfaces
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118 // Note: this does nothing on Mac OS X at the moment - there is no
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119 // hardware-accelerated blitting support.
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120 - (Uint32)fastestFlags:(Uint32)flags :(int)width :(int)height :(int)bpp
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121 {
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122 const SDL_VideoInfo *info;
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123
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124 // Hardware acceleration is only used in fullscreen mode
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125 flags |= SDL_FULLSCREEN;
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126
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127 // Check for various video capabilities
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128 info = SDL_GetVideoInfo();
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129 if ( info->blit_hw_CC && info->blit_fill ) {
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130 // We use accelerated colorkeying and color filling
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131 flags |= SDL_HWSURFACE;
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132 }
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133 // If we have enough video memory, and will use accelerated
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134 // blits directly to it, then use page flipping.
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135 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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136
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137 // Direct hardware blitting without double-buffering
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138 // causes really bad flickering.
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139 if ( info->video_mem*1024 > (height*width*bpp/8) ) {
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140 flags |= SDL_DOUBLEBUF;
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141 } else {
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142 flags &= ~SDL_HWSURFACE;
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143 }
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144 }
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145
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146 // Return the flags
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147 return flags;
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148 }
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149
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150 - (int)loadSpriteFromFile:(const char*)file
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151 {
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152 SDL_Surface *temp;
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153
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154 // Load the sprite image
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155 _sprite = SDL_LoadBMP (file);
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156 if ( _sprite == NULL ) {
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157 fprintf (stderr, "Couldn't load %s: %s", file, SDL_GetError ());
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158 return (-1);
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159 }
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160
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161 // Set transparent pixel as the pixel at (0,0)
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162 if ( _sprite->format->palette ) {
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163 SDL_SetColorKey (_sprite, (SDL_SRCCOLORKEY|SDL_RLEACCEL),
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164 *(Uint8 *)_sprite->pixels);
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165 }
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166
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167 /* Convert sprite to video format */
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168 temp = SDL_DisplayFormat (_sprite);
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169 SDL_FreeSurface (_sprite);
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170 if ( temp == NULL ) {
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171 fprintf(stderr, "Couldn't convert background: %s\n",
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172 SDL_GetError ());
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173 return (-1);
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174 }
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175 _sprite = temp;
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176
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177 // We're ready to roll. :)
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178 return 0;
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179 }
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180
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181 - (void)allocSprites
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182 {
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183 /* Allocate memory for the sprite info */
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184 _mem = (Uint8 *)malloc (4*sizeof(SDL_Rect)*_nSprites);
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185 if ( _mem == NULL ) {
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186 fprintf (stderr, "Out of memory!\n");
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187 exit (2);
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188 }
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189
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190 _sprite_rects = (SDL_Rect *)_mem;
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191 _positions = _sprite_rects;
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192 _sprite_rects += _nSprites;
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193 _velocities = _sprite_rects;
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194 _sprite_rects += _nSprites;
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195 _sprite_w = _sprite->w;
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196 _sprite_h = _sprite->h;
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197 }
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198
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199 - (void)freeSprites
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200 {
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201 free (_mem);
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202 _mem = NULL;
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203 }
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204
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205 - (void)initSprites
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206 {
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207 // Give each sprite a random starting position and velocity
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208 int i;
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209
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210 srand(time(NULL));
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211 for ( i=0; i < _nSprites; ++i ) {
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212 _positions[i].x = rand()%(_screen->w - _sprite->w);
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213 _positions[i].y = rand()%(_screen->h - _sprite->h);
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214 _positions[i].w = _sprite->w;
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215 _positions[i].h = _sprite->h;
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216 _velocities[i].x = 0;
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217 _velocities[i].y = 0;
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218 while ( ! _velocities[i].x && ! _velocities[i].y ) {
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219 _velocities[i].x = (rand()%(_max_speed*2+1)) - _max_speed;
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220 _velocities[i].y = (rand()%(_max_speed*2+1)) - _max_speed;
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221 }
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222 }
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223 }
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224
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225 - (void)moveSprites:(int)backgroundColor;
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226 {
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227 int i, nupdates;
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228 SDL_Rect area, *position, *velocity;
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229
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230 nupdates = 0;
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231 // Erase all the sprites if necessary
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232 if ( _sprites_visible ) {
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233 SDL_FillRect (_screen, NULL, backgroundColor);
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234 }
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235
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236 // Move the sprite, bounce at the wall, and draw
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237 for ( i=0; i < _nSprites; ++i ) {
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238 position = &_positions[i];
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239 velocity = &_velocities[i];
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240 position->x += velocity->x;
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241 if ( (position->x < 0) || (position->x >= (_screen->w - _sprite_w)) ) {
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242 velocity->x = -velocity->x;
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243 position->x += velocity->x;
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244 }
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245 position->y += velocity->y;
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246 if ( (position->y < 0) || (position->y >= (_screen->h - _sprite_w)) ) {
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247 velocity->y = -velocity->y;
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248 position->y += velocity->y;
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249 }
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250
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251 // Blit the sprite onto the screen
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252 area = *position;
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253 SDL_BlitSurface (_sprite, NULL, _screen, &area);
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254 _sprite_rects[nupdates++] = area;
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255 }
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256
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257 // Update the screen!
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258 if ( _doFlip ) {
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259 SDL_Flip (_screen);
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260 } else {
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261 SDL_UpdateRects (_screen, nupdates, _sprite_rects);
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262 }
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263
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264 _sprites_visible = 1;
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265 }
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266
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267 - (int)run:(int)argc argv:(char*[])argv
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268 {
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269 int width, height;
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270 Uint8 video_bpp;
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271 Uint32 videoflags;
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272 Uint32 background;
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273 int done;
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274 SDL_Event event;
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275 Uint32 then, now, frames;
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276
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277 // Initialize SDL
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278 if ( SDL_Init (SDL_INIT_VIDEO) < 0 ) {
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279 fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
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280 exit (1);
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281 }
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282 atexit(SDL_Quit);
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283
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284 videoflags = SDL_SWSURFACE|SDL_ANYFORMAT;
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diff changeset
285 width = 640;
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diff changeset
286 height = 480;
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diff changeset
287 video_bpp = 8;
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288 while ( argc > 1 ) {
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289 --argc;
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290 if ( strcmp(argv[argc-1], "-width") == 0 ) {
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diff changeset
291 width = atoi (argv[argc]);
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diff changeset
292 --argc;
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293 } else
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294 if ( strcmp(argv[argc-1], "-height") == 0 ) {
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295 height = atoi (argv[argc]);
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diff changeset
296 --argc;
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297 } else
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298 if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
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299 video_bpp = atoi (argv[argc]);
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300 videoflags &= ~SDL_ANYFORMAT;
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301 --argc;
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302 } else
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303 if ( strcmp (argv[argc], "-fast") == 0 ) {
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304 videoflags = [ self fastestFlags:videoflags :width :height :video_bpp ];
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305 } else
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306 if ( strcmp (argv[argc], "-hw") == 0 ) {
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307 videoflags ^= SDL_HWSURFACE;
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308 } else
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309 if ( strcmp (argv[argc], "-flip") == 0 ) {
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310 videoflags ^= SDL_DOUBLEBUF;
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311 } else
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312 if ( strcmp (argv[argc], "-fullscreen") == 0 ) {
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313 videoflags ^= SDL_FULLSCREEN;
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314 } else
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315 if ( isdigit(argv[argc][0]) ) {
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316 _nSprites = atoi (argv[argc]);
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317 } else {
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318 fprintf (stderr,
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319 "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numSprites]\n",
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320 argv[0]);
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321 exit (1);
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322 }
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323 }
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diff changeset
324
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325 // The width/height passed to SDL_SetVideoMode should match the size of the NSView
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326 width = [ _view frame ].size.width;
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327 height = [ _view frame ].size.height;
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328 videoflags &= ~SDL_FULLSCREEN; // this only for windowed mode
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329 if ( [ _window styleMask ] & NSResizableWindowMask ) // enable resizable window
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330 videoflags |= SDL_RESIZABLE;
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331 [ self setupCocoaWindow ];
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332 [ self setCocoaEnvironmentVariables ];
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333 _mouse_x = width/2;
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334 _mouse_y = width/2;
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diff changeset
335
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diff changeset
336 // Set video mode
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337 _screen = SDL_SetVideoMode (width, height, video_bpp, videoflags);
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338 if ( ! _screen ) {
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339 fprintf (stderr, "Couldn't set %dx%d video mode: %s\n",
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340 width, height, SDL_GetError());
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diff changeset
341 exit (2);
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diff changeset
342 }
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diff changeset
343
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344 // Print out surface info
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345 [ self printFlags:videoflags withName:"Requested flags: " ];
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346 [ self printFlags:_screen->flags withName:"Got flags: " ];
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347
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348 // Load the sprite
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349 // The sprite is located in the Resources section of the .app bundle.
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350 // SDL does not seem aware of bundle paths, so we must construct the path manually.
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351 NSString* resource_path = [[NSBundle mainBundle] resourcePath];
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352 NSString* icon_path = [resource_path stringByAppendingString:@"/icon.bmp"];
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353 if ( [ self loadSpriteFromFile:[icon_path UTF8String] ] < 0 ) {
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354 exit (1);
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355 }
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diff changeset
356
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357 [ self allocSprites ];
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358 [ self initSprites ];
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diff changeset
359
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360 background = SDL_MapRGB (_screen->format, 0x00, 0x00, 0x00);
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diff changeset
361
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diff changeset
362 // Print out information about our surfaces
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363 printf("Screen is at %d bits per pixel\n", _screen->format->BitsPerPixel);
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364 if ( (_screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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diff changeset
365 printf ("Screen is in video memory\n");
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diff changeset
366 } else {
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367 printf ("Screen is in system memory\n");
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diff changeset
368 }
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diff changeset
369 if ( (_screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
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diff changeset
370 printf ("Screen has double-buffering enabled\n");
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diff changeset
371 }
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diff changeset
372 if ( (_sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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diff changeset
373 printf ("Sprite is in video memory\n");
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diff changeset
374 } else {
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diff changeset
375 printf ("Sprite is in system memory\n");
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diff changeset
376 }
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diff changeset
377
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diff changeset
378 // Run a sample blit to trigger blit acceleration
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diff changeset
379 {
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diff changeset
380 SDL_Rect dst;
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diff changeset
381 dst.x = 0;
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diff changeset
382 dst.y = 0;
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diff changeset
383 dst.w = _sprite->w;
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diff changeset
384 dst.h = _sprite->h;
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diff changeset
385 SDL_BlitSurface (_sprite, NULL, _screen, &dst);
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diff changeset
386 SDL_FillRect (_screen, &dst, background);
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diff changeset
387 }
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diff changeset
388 if ( (_sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
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diff changeset
389 printf("Sprite blit uses hardware acceleration\n");
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diff changeset
390 }
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diff changeset
391 if ( (_sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
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parents:
diff changeset
392 printf("Sprite blit uses RLE acceleration\n");
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parents:
diff changeset
393 }
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diff changeset
394
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
395 // Loop, blitting sprites and waiting for a keystroke
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
396 frames = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
397 then = SDL_GetTicks();
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parents:
diff changeset
398 done = 0;
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diff changeset
399 _sprites_visible = 0;
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parents:
diff changeset
400 while ( !done ) {
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parents:
diff changeset
401 // Check for events
d63e9f5944ae Unpacked project archives to get individual file history in subversion
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
402 ++frames;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
403 while ( SDL_PollEvent(&event) ) {
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parents:
diff changeset
404 switch (event.type) {
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parents:
diff changeset
405
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parents:
diff changeset
406 case SDL_VIDEORESIZE:
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diff changeset
407
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diff changeset
408 // Recreate the video mode. Use the same bpp and flags
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parents:
diff changeset
409 // that the original window was created with
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parents:
diff changeset
410 _screen = SDL_SetVideoMode (event.resize.w, event.resize.h,
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parents:
diff changeset
411 video_bpp, videoflags);
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parents:
diff changeset
412
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diff changeset
413 // Clear screen and reinit sprite positions
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parents:
diff changeset
414 SDL_FillRect (_screen, NULL, 0);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
415 [ self initSprites ];
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
416 break;
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parents:
diff changeset
417
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parents:
diff changeset
418 case SDL_MOUSEMOTION:
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parents:
diff changeset
419
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Sam Lantinga <slouken@libsdl.org>
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420 _velocities[_nSprites-1].x = 0;
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421 _velocities[_nSprites-1].y = 0;
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422 _positions[_nSprites-1].x = event.motion.x - _sprite->w/2;
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423 _positions[_nSprites-1].y = event.motion.y - _sprite->h/2;
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424 //printf ("motion: %d %d\n", event.motion.x, event.motion.y);
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425 break;
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426
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427 case SDL_MOUSEBUTTONDOWN:
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428
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429 _velocities[_nSprites-1].x = 0;
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430 _velocities[_nSprites-1].y = 0;
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431 _positions[_nSprites-1].x = event.button.x;
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432 _positions[_nSprites-1].y = event.button.y;
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433 //printf ("button: %d %d\n", event.button.x, event.button.y);
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434 break;
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435
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436 case SDL_KEYDOWN:
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437
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438 // Escape also quits the app
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439 if (event.key.keysym.sym == SDLK_ESCAPE)
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440 done = 1;
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441
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442 // Control-W warps the cursor
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443 if (event.key.keysym.sym == SDLK_w &&
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444 ( SDL_GetModState () & KMOD_LCTRL ) )
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445 SDL_WarpMouse (_screen->w/2, _screen->h/2);
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446
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447 // Control-G toggles input grabbing
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448 if (event.key.keysym.sym == SDLK_g &&
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449 ( SDL_GetModState () & KMOD_LCTRL ) )
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450 if ( SDL_WM_GrabInput (SDL_GRAB_QUERY) == SDL_GRAB_OFF )
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451 SDL_WM_GrabInput (SDL_GRAB_ON);
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452 else
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453 SDL_WM_GrabInput (SDL_GRAB_OFF);
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454 break;
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455
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456 case SDL_QUIT:
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457 done = 1;
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458 break;
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459 default:
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460 break;
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461 }
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462 }
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463
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464 // Draw sprites
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465 [ self moveSprites:background ];
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466
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467 // Update fps counter every 100 frames
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468 if ((frames % 100) == 0) {
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469 now = SDL_GetTicks ();
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470 [ _framesPerSecond setFloatValue:((float)frames*1000)/(now-then) ];
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471 frames = 0;
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472 then = now;
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473 }
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474 }
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475 [ self freeSprites ];
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476 SDL_FreeSurface (_sprite);
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477
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478 SDL_Quit ();
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479 return 0;
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480 }
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481
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482 - (IBAction)changeNumberOfSprites:(id)sender
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483 {
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484 [ _numSprites setIntValue:[ sender intValue ] ];
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485 [ self freeSprites ];
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486 _nSprites = [ sender intValue ];
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487 [ self allocSprites ];
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488 [ self initSprites ];
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489 SDL_FillRect (_screen, NULL, 0);
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490 SDL_Flip (_screen);
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491 }
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492
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493 - (IBAction)selectUpdateMode:(id)sender
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494 {
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495 _doFlip = ![ sender selectedRow ]; // row is 0 or 1
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496 }
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497
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498 @end
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499
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500 int main(int argc, char *argv[])
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501 {
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502 // Hand off to instance of MyController
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503 // This instance is created when SDLMain.nib is loaded,
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504 // and the global variable is set in [SDLMain applicationDidFinishLaunching:]
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505 return [ gController run:argc argv:argv ];
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506 }