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annotate XCodeiPhoneOS/Demos/src/accelerometer.c @ 2429:2c55b72ba46e gsoc2008_iphone

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testdyngles is exactly what it sounds like -- a version of testdyngl that uses OpenGL ES calls instead of OpenGL. Was necessary to create because glOrtho is called glOrthof in OpenGL ES, and OpenGL ES doesn't have glBegin() type semantics for specifying geometry.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:52:52 +0000
parents ecc18fbfdec3
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
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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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diff changeset
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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diff changeset
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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diff changeset
220 } else if (delay > MILLESECONDS_PER_FRAME) {
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diff changeset
221 delay = MILLESECONDS_PER_FRAME;
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diff changeset
222 }
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223 SDL_Delay(delay);
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diff changeset
224 }
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diff changeset
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 }