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annotate XCodeiPhoneOS/Demos/src/accelerometer.c @ 2424:ecc18fbfdec3 gsoc2008_iphone

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Added references to SDL_IPHONE_MAX_GFORCE ... that way this value can change without altering the demos behavior. More understandable too.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:40:47 +0000
parents 7fbcfc1574dc
children
rev   line source
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1 /*
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2 * accelerometer.c
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3 * written by Holmes Futrell
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4 * use however you want
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5 */
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6
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7 #include "SDL.h"
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8 #include "math.h"
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9 #include "common.h"
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10
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11 #define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
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12 #define DAMPING 0.5f; /* after bouncing off a wall, damping coefficient determines final speed */
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13 #define FRICTION 0.0008f /* coefficient of acceleration that opposes direction of motion */
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14 #define GRAVITY_CONSTANT 0.004f /* how sensitive the ship is to the accelerometer */
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15
ecc18fbfdec3 Added references to SDL_IPHONE_MAX_GFORCE ... that way this value can change without altering the demos behavior. More understandable too.
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16 /* If we aren't on an iPhone, then this definition ought to yield reasonable behavior */
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17 #ifndef SDL_IPHONE_MAX_GFORCE
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18 #define SDL_IPHONE_MAX_GFORCE 5.0f
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19 #endif
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20
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21 static SDL_Joystick *accelerometer; /* used for controlling the ship */
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22
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23 static struct {
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24 float x, y; /* position of ship */
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25 float vx, vy; /* velocity of ship (in pixels per millesecond) */
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26 SDL_Rect rect; /* (drawn) position and size of ship */
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27 } ship;
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28
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29 static SDL_TextureID shipID=0; /* texture for spaceship */
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30 static SDL_TextureID spaceID=0; /* texture for space (background */
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31
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32 void render(void) {
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33
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34
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35 /* get joystick (accelerometer) axis values and normalize them */
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36 float ax = SDL_JoystickGetAxis(accelerometer, 0);
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37 float ay = -SDL_JoystickGetAxis(accelerometer, 1);
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38
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39 /* ship screen constraints */
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40 Uint32 minx = 0.0f;
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41 Uint32 maxx = SCREEN_WIDTH - ship.rect.w;
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42 Uint32 miny = 0.0f;
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43 Uint32 maxy = SCREEN_HEIGHT - ship.rect.h;
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44
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45 #define SINT16_MAX ((float)(0x7FFF))
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46
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47 /* update velocity from accelerometer
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48 the factor SDL_IPHONE_MAX_G_FORCE / SINT16_MAX converts between
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49 SDL's units reported from the joytick, and units of g-force, as reported by the accelerometer
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50 */
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51 ship.vx += ax * SDL_IPHONE_MAX_GFORCE / SINT16_MAX * GRAVITY_CONSTANT * MILLESECONDS_PER_FRAME;
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52 ship.vy += ay * SDL_IPHONE_MAX_GFORCE / SINT16_MAX * GRAVITY_CONSTANT * MILLESECONDS_PER_FRAME;
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53
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54 float speed = sqrt(ship.vx * ship.vx + ship.vy * ship.vy);
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55
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56 if (speed > 0) {
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57 /* compensate for friction */
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58 float dirx = ship.vx / speed; /* normalized x velocity */
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59 float diry = ship.vy / speed; /* normalized y velocity */
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60
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61 /* update velocity due to friction */
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62 if (speed - FRICTION * MILLESECONDS_PER_FRAME > 0) {
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63 /* apply friction */
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64 ship.vx -= dirx * FRICTION * MILLESECONDS_PER_FRAME;
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65 ship.vy -= diry * FRICTION * MILLESECONDS_PER_FRAME;
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66 }
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67 else {
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68 /* applying friction would MORE than stop the ship, so just stop the ship */
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69 ship.vx = 0.0f;
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70 ship.vy = 0.0f;
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71 }
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72 }
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73
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74 /* update ship location */
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75 ship.x += ship.vx * MILLESECONDS_PER_FRAME;
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76 ship.y += ship.vy * MILLESECONDS_PER_FRAME;
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77
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78 if (ship.x > maxx) {
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79 ship.x = maxx;
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80 ship.vx = -ship.vx * DAMPING;
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81 }
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82 else if (ship.x < minx) {
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83 ship.x = minx;
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84 ship.vx = -ship.vx * DAMPING;
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85 }
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86 if (ship.y > maxy) {
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87 ship.y = maxy;
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88 ship.vy = -ship.vy * DAMPING;
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89 }
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90 else if (ship.y < miny) {
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91 ship.y = miny;
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92 ship.vy = -ship.vy * DAMPING;
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93 }
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94
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95 /* draw the background */
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96 SDL_RenderCopy(spaceID, NULL, NULL);
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97
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98 /* draw the ship */
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99 ship.rect.x = ship.x;
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100 ship.rect.y = ship.y;
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101
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102 SDL_RenderCopy(shipID, NULL, &ship.rect);
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103
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104 /* update screen */
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105 SDL_RenderPresent();
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106
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107 }
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108
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109 void initializeTextures() {
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110
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111 SDL_Surface *bmp_surface;
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112 SDL_Surface *bmp_surface_rgba;
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113 int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */
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114 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */
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115 int bpp; /* bits per pixel for desired format */
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116
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117 /* load the ship */
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118 bmp_surface = SDL_LoadBMP("ship.bmp");
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119 if (bmp_surface == NULL) {
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120 fatalError("could not ship.bmp");
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121 }
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122 /* set blue to transparent on the ship */
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123 SDL_SetColorKey(bmp_surface, 1, SDL_MapRGB(bmp_surface->format, 0, 0, 255));
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124 SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
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125 /*
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126 create a new RGBA surface and blit the bmp to it
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127 this is an extra step, but it seems to be necessary for the color key to work
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128
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129 does the fact that this is necessary indicate a bug in SDL?
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130 */
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131 bmp_surface_rgba = SDL_CreateRGBSurface(0, bmp_surface->w, bmp_surface->h, bpp, Rmask, Gmask, Bmask, Amask);
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132 SDL_BlitSurface(bmp_surface, NULL, bmp_surface_rgba, NULL);
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133
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134 /* create ship texture from surface */
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135 shipID = SDL_CreateTextureFromSurface(format, bmp_surface_rgba);
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136 if (shipID == 0) {
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137 fatalError("could not create ship texture");
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138 }
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139 SDL_SetTextureBlendMode(shipID, SDL_TEXTUREBLENDMODE_BLEND);
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140
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141 /* set the width and height of the ship from the surface dimensions */
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142 ship.rect.w = bmp_surface->w;
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143 ship.rect.h = bmp_surface->h;
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144
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145 SDL_FreeSurface(bmp_surface_rgba);
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146 SDL_FreeSurface(bmp_surface);
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147
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148 /* load the space background */
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149 bmp_surface = SDL_LoadBMP("space.bmp");
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150 if (bmp_surface == NULL) {
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151 fatalError("could not load space.bmp");
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152 }
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153 /* create space texture from surface */
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154 spaceID = SDL_CreateTextureFromSurface(format, bmp_surface);
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155 if (spaceID == 0) {
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156 fatalError("could not create space texture");
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157 }
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158 SDL_FreeSurface(bmp_surface);
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159
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160 }
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161
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162
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163
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164 int main(int argc, char *argv[]) {
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165
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166 SDL_WindowID windowID; /* ID of main window */
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167 Uint32 startFrame; /* time frame began to process */
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168 Uint32 endFrame; /* time frame ended processing */
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169 Uint32 delay; /* time to pause waiting to draw next frame */
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170 int done; /* should we clean up and exit? */
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171
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172 /* initialize SDL */
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173 if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_JOYSTICK) < 0) {
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174 fatalError("Could not initialize SDL");
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175 }
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176
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177 /* create main window and renderer */
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178 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,\
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179 SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
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180 SDL_CreateRenderer(windowID, 0, 0);
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181
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182 /* print out some info about joysticks and try to open accelerometer for use */
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183 printf("There are %d joysticks available\n", SDL_NumJoysticks());
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184 printf("Default joystick (index 0) is %s\n", SDL_JoystickName(0));
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185 accelerometer = SDL_JoystickOpen(0);
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186 if (accelerometer == NULL) {
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187 fatalError("Could not open joystick (accelerometer)");
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188 }
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189 printf("joystick number of axis = %d\n", SDL_JoystickNumAxes(accelerometer));
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190 printf("joystick number of hats = %d\n", SDL_JoystickNumHats(accelerometer));
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191 printf("joystick number of balls = %d\n", SDL_JoystickNumBalls(accelerometer));
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192 printf("joystick number of buttons = %d\n", SDL_JoystickNumButtons(accelerometer));
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193
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194 /* load graphics */
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195 initializeTextures();
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196
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197 /* setup ship */
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198 ship.x = (SCREEN_WIDTH - ship.rect.w) / 2;
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199 ship.y = (SCREEN_HEIGHT - ship.rect.h) / 2;
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200 ship.vx = 0.0f;
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201 ship.vy = 0.0f;
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202
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203 done = 0;
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204 /* enter main loop */
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205 while(!done) {
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206 startFrame = SDL_GetTicks();
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207 SDL_Event event;
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208 while (SDL_PollEvent(&event)) {
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209 if (event.type == SDL_QUIT) {
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210 done = 1;
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211 }
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212 }
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213 render();
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214 endFrame = SDL_GetTicks();
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215
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216 /* figure out how much time we have left, and then sleep */
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217 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
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diff changeset
218 if (delay < 0) {
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219 delay = 0;
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220 } else if (delay > MILLESECONDS_PER_FRAME) {
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221 delay = MILLESECONDS_PER_FRAME;
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diff changeset
222 }
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223 SDL_Delay(delay);
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224 }
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225
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226 /* delete textures */
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227 SDL_DestroyTexture(shipID);
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228 SDL_DestroyTexture(spaceID);
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229
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230 /* shutdown SDL */
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231 SDL_Quit();
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232
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parents:
diff changeset
233 return 0;
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parents:
diff changeset
234
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235 }