sdl-ios-xcode: Xcode-iPhoneOS/Demos/src/accelerometer.c annotate

annotate Xcode-iPhoneOS/Demos/src/accelerometer.c @ 3621:2fbe6995b2a2

Made the comment more readable

author	Sam Lantinga <slouken@libsdl.org>
date	Thu, 07 Jan 2010 04:39:44 +0000
parents	20326ba2bda2
children	64ce267332c6

rev	line source
3277 20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	1 /*
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	2 * accelerometer.c
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	3 * written by Holmes Futrell
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	4 * use however you want
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	5 */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	6
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	7 #include "SDL.h"
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	8 #include "math.h"
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	9 #include "common.h"
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	10
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	11 #define MILLESECONDS_PER_FRAME 16 /* about 60 frames per second */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12 #define DAMPING 0.5f; /* after bouncing off a wall, damping coefficient determines final speed */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	13 #define FRICTION 0.0008f /* coefficient of acceleration that opposes direction of motion */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14 #define GRAVITY_CONSTANT 0.004f /* how sensitive the ship is to the accelerometer */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	15
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	16 /* If we aren't on an iPhone, then this definition ought to yield reasonable behavior */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	17 #ifndef SDL_IPHONE_MAX_GFORCE
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18 #define SDL_IPHONE_MAX_GFORCE 5.0f
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 #endif
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21 static SDL_Joystick accelerometer; / used for controlling the ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	22
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	23 static struct
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	24 {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	25 float x, y; /* position of ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	26 float vx, vy; /* velocity of ship (in pixels per millesecond) */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	27 SDL_Rect rect; /* (drawn) position and size of ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	28 } ship;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	29
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	30 static SDL_TextureID shipID = 0; /* texture for spaceship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	31 static SDL_TextureID spaceID = 0; /* texture for space (background */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	32
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	33 void
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	34 render(void)
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	35 {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	36
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	37
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	38 /* get joystick (accelerometer) axis values and normalize them */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	39 float ax = SDL_JoystickGetAxis(accelerometer, 0);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	40 float ay = -SDL_JoystickGetAxis(accelerometer, 1);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	41
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	42 /* ship screen constraints */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	43 Uint32 minx = 0.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	44 Uint32 maxx = SCREEN_WIDTH - ship.rect.w;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	45 Uint32 miny = 0.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	46 Uint32 maxy = SCREEN_HEIGHT - ship.rect.h;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	47
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	48 #define SINT16_MAX ((float)(0x7FFF))
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	49
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	50 /* update velocity from accelerometer
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	51 the factor SDL_IPHONE_MAX_G_FORCE / SINT16_MAX converts between
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	52 SDL's units reported from the joytick, and units of g-force, as reported by the accelerometer
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	53 */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	54 ship.vx +=
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	55 ax * SDL_IPHONE_MAX_GFORCE / SINT16_MAX * GRAVITY_CONSTANT *
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	56 MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	57 ship.vy +=
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	58 ay * SDL_IPHONE_MAX_GFORCE / SINT16_MAX * GRAVITY_CONSTANT *
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	59 MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	60
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	61 float speed = sqrt(ship.vx * ship.vx + ship.vy * ship.vy);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	62
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	63 if (speed > 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	64 /* compensate for friction */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	65 float dirx = ship.vx / speed; /* normalized x velocity */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	66 float diry = ship.vy / speed; /* normalized y velocity */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	67
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	68 /* update velocity due to friction */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	69 if (speed - FRICTION * MILLESECONDS_PER_FRAME > 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	70 /* apply friction */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	71 ship.vx -= dirx * FRICTION * MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	72 ship.vy -= diry * FRICTION * MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	73 } else {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	74 /* applying friction would MORE than stop the ship, so just stop the ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	75 ship.vx = 0.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	76 ship.vy = 0.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	77 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	78 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	79
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	80 /* update ship location */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	81 ship.x += ship.vx * MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	82 ship.y += ship.vy * MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	83
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	84 if (ship.x > maxx) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	85 ship.x = maxx;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	86 ship.vx = -ship.vx * DAMPING;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	87 } else if (ship.x < minx) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	88 ship.x = minx;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	89 ship.vx = -ship.vx * DAMPING;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	90 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	91 if (ship.y > maxy) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	92 ship.y = maxy;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	93 ship.vy = -ship.vy * DAMPING;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	94 } else if (ship.y < miny) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	95 ship.y = miny;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	96 ship.vy = -ship.vy * DAMPING;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	97 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	98
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	99 /* draw the background */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	100 SDL_RenderCopy(spaceID, NULL, NULL);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	101
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	102 /* draw the ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	103 ship.rect.x = ship.x;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	104 ship.rect.y = ship.y;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	105
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	106 SDL_RenderCopy(shipID, NULL, &ship.rect);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	107
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	108 /* update screen */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	109 SDL_RenderPresent();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	110
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	111 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	112
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	113 void
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	114 initializeTextures()
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	115 {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	116
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	117 SDL_Surface *bmp_surface;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	118 SDL_Surface *bmp_surface_rgba;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	119 int format = SDL_PIXELFORMAT_ABGR8888; /* desired texture format */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	120 Uint32 Rmask, Gmask, Bmask, Amask; /* masks for desired format */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	121 int bpp; /* bits per pixel for desired format */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	122
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	123 /* load the ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	124 bmp_surface = SDL_LoadBMP("ship.bmp");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	125 if (bmp_surface == NULL) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	126 fatalError("could not ship.bmp");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	127 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	128 /* set blue to transparent on the ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	129 SDL_SetColorKey(bmp_surface, 1,
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	130 SDL_MapRGB(bmp_surface->format, 0, 0, 255));
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	131 SDL_PixelFormatEnumToMasks(format, &bpp, &Rmask, &Gmask, &Bmask, &Amask);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	132 /*
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	133 create a new RGBA surface and blit the bmp to it
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	134 this is an extra step, but it seems to be necessary for the color key to work
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	135
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	136 does the fact that this is necessary indicate a bug in SDL?
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	137 */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	138 bmp_surface_rgba =
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	139 SDL_CreateRGBSurface(0, bmp_surface->w, bmp_surface->h, bpp, Rmask,
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	140 Gmask, Bmask, Amask);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	141 SDL_BlitSurface(bmp_surface, NULL, bmp_surface_rgba, NULL);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	142
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	143 /* create ship texture from surface */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	144 shipID = SDL_CreateTextureFromSurface(format, bmp_surface_rgba);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	145 if (shipID == 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	146 fatalError("could not create ship texture");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	147 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	148 SDL_SetTextureBlendMode(shipID, SDL_BLENDMODE_BLEND);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	149
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	150 /* set the width and height of the ship from the surface dimensions */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	151 ship.rect.w = bmp_surface->w;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	152 ship.rect.h = bmp_surface->h;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	153
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	154 SDL_FreeSurface(bmp_surface_rgba);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	155 SDL_FreeSurface(bmp_surface);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	156
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	157 /* load the space background */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	158 bmp_surface = SDL_LoadBMP("space.bmp");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	159 if (bmp_surface == NULL) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	160 fatalError("could not load space.bmp");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	161 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	162 /* create space texture from surface */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	163 spaceID = SDL_CreateTextureFromSurface(format, bmp_surface);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	164 if (spaceID == 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	165 fatalError("could not create space texture");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	166 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	167 SDL_FreeSurface(bmp_surface);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	168
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	169 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	170
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	171
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	172
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	173 int
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	174 main(int argc, char *argv[])
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	175 {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	176
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	177 SDL_WindowID windowID; /* ID of main window */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	178 Uint32 startFrame; /* time frame began to process */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	179 Uint32 endFrame; /* time frame ended processing */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	180 Uint32 delay; /* time to pause waiting to draw next frame */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	181 int done; /* should we clean up and exit? */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	182
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	183 /* initialize SDL */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	184 if (SDL_Init(SDL_INIT_VIDEO \| SDL_INIT_JOYSTICK) < 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	185 fatalError("Could not initialize SDL");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	186 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	187
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	188 /* create main window and renderer */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	189 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	190 SDL_WINDOW_OPENGL \| SDL_WINDOW_SHOWN \|
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	191 SDL_WINDOW_BORDERLESS);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	192 SDL_CreateRenderer(windowID, 0, 0);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	193
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	194 /* print out some info about joysticks and try to open accelerometer for use */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	195 printf("There are %d joysticks available\n", SDL_NumJoysticks());
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	196 printf("Default joystick (index 0) is %s\n", SDL_JoystickName(0));
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	197 accelerometer = SDL_JoystickOpen(0);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	198 if (accelerometer == NULL) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	199 fatalError("Could not open joystick (accelerometer)");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	200 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	201 printf("joystick number of axis = %d\n",
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	202 SDL_JoystickNumAxes(accelerometer));
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	203 printf("joystick number of hats = %d\n",
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	204 SDL_JoystickNumHats(accelerometer));
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	205 printf("joystick number of balls = %d\n",
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	206 SDL_JoystickNumBalls(accelerometer));
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	207 printf("joystick number of buttons = %d\n",
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	208 SDL_JoystickNumButtons(accelerometer));
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	209
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	210 /* load graphics */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	211 initializeTextures();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	212
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	213 /* setup ship */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	214 ship.x = (SCREEN_WIDTH - ship.rect.w) / 2;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	215 ship.y = (SCREEN_HEIGHT - ship.rect.h) / 2;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	216 ship.vx = 0.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	217 ship.vy = 0.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	218
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	219 done = 0;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	220 /* enter main loop */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	221 while (!done) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	222 startFrame = SDL_GetTicks();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	223 SDL_Event event;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	224 while (SDL_PollEvent(&event)) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	225 if (event.type == SDL_QUIT) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	226 done = 1;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	227 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	228 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	229 render();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	230 endFrame = SDL_GetTicks();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	231
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	232 /* figure out how much time we have left, and then sleep */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	233 delay = MILLESECONDS_PER_FRAME - (endFrame - startFrame);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	234 if (delay < 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	235 delay = 0;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	236 } else if (delay > MILLESECONDS_PER_FRAME) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	237 delay = MILLESECONDS_PER_FRAME;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	238 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	239 SDL_Delay(delay);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	240 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	241
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	242 /* delete textures */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	243 SDL_DestroyTexture(shipID);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	244 SDL_DestroyTexture(spaceID);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	245
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	246 /* shutdown SDL */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	247 SDL_Quit();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	248
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	249 return 0;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	250
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	251 }

Mercurial > sdl-ios-xcode

annotate Xcode-iPhoneOS/Demos/src/accelerometer.c @ 3621:2fbe6995b2a2