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

annotate Xcode-iPhoneOS/Demos/src/touch.c @ 3468:789b97008d8a

My first OpenGL shader! Momma will be so proud! This shader implements the software renderer mask semantics where the source pixel is multiplied by the color and alpha modulation values and then any pixel with non-zero alpha is fully opaque. The OpenGL renderer on Mac OS X now passes all the automated render tests! :)

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 21 Nov 2009 05:29:31 +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 * touch.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 BRUSH_SIZE 32 /* width and height of the brush */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12 #define PIXELS_PER_ITERATION 5 /* number of pixels between brush blots when forming a line */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	13
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14 static SDL_TextureID brushID = 0; /* texture for the brush */
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 /*
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	17 draws a line from (startx, starty) to (startx + dx, starty + dy)
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18 this is accomplished by drawing several blots spaced PIXELS_PER_ITERATION apart
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20 void
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21 drawLine(float startx, float starty, float dx, float dy)
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
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	24 float distance = sqrt(dx * dx + dy * dy); /* length of line segment (pythagoras) */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	25 int iterations = distance / PIXELS_PER_ITERATION + 1; /* number of brush sprites to draw for the line */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	26 float dx_prime = dx / iterations; /* x-shift per iteration */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	27 float dy_prime = dy / iterations; /* y-shift per iteration */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	28 SDL_Rect dstRect; /* rect to draw brush sprite into */
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 dstRect.w = BRUSH_SIZE;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	31 dstRect.h = BRUSH_SIZE;
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 /* setup x and y for the location of the first sprite */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	34 float x = startx - BRUSH_SIZE / 2.0f;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	35 float y = starty - BRUSH_SIZE / 2.0f;
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 int i;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	38 /* draw a series of blots to form the line */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	39 for (i = 0; i < iterations; i++) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	40 dstRect.x = x;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	41 dstRect.y = y;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	42 /* shift x and y for next sprite location */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	43 x += dx_prime;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	44 y += dy_prime;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	45 /* draw brush blot */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	46 SDL_RenderCopy(brushID, NULL, &dstRect);
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 }
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 /*
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	51 loads the brush texture
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	52 */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	53 void
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	54 initializeTexture()
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	55 {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	56 SDL_Surface *bmp_surface;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	57 bmp_surface = SDL_LoadBMP("stroke.bmp");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	58 if (bmp_surface == NULL) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	59 fatalError("could not load stroke.bmp");
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 brushID =
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	62 SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, bmp_surface);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	63 SDL_FreeSurface(bmp_surface);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	64 if (brushID == 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	65 fatalError("could not create brush texture");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	66 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	67 /* additive blending -- laying strokes on top of eachother makes them brighter */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	68 SDL_SetTextureBlendMode(brushID, SDL_BLENDMODE_ADD);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	69 /* set brush color (red) */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	70 SDL_SetTextureColorMod(brushID, 255, 100, 100);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	71 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	72
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	73 int
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	74 main(int argc, char *argv[])
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	75 {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	76
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	77 int x, y, dx, dy; /* mouse location */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	78 Uint8 state; /* mouse (touch) state */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	79 SDL_Event event;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	80 SDL_WindowID windowID; /* main window */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	81 int done; /* does user want to quit? */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	82
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	83 /* initialize SDL */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	84 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	85 fatalError("Could not initialize SDL");
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	86 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	87
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	88 /* create main window and renderer */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	89 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	90 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	91 SDL_WINDOW_BORDERLESS);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	92 SDL_CreateRenderer(windowID, 0, 0);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	93
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	94 /load brush texture /
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	95 initializeTexture();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	96
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	97 /* fill canvass initially with all black */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	98 SDL_SetRenderDrawColor(0, 0, 0, 255);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	99 SDL_RenderFill(NULL);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	100 SDL_RenderPresent();
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 done = 0;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	103 while (!done && SDL_WaitEvent(&event)) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	104 switch (event.type) {
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	105 case SDL_QUIT:
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	106 done = 1;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	107 break;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	108 case SDL_MOUSEMOTION:
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	109 SDL_SelectMouse(event.motion.which); /* select 'mouse' (touch) that moved */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	110 state = SDL_GetMouseState(&x, &y); /* get its location */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	111 SDL_GetRelativeMouseState(&dx, &dy); /* find how much the mouse moved */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	112 if (state & SDL_BUTTON_LMASK) { /* is the mouse (touch) down? */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	113 drawLine(x - dx, y - dy, dx, dy); /* draw line segment */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	114 SDL_RenderPresent();
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 break;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	117 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	118 }
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	119
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	120 /* cleanup */
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	121 SDL_DestroyTexture(brushID);
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	122 SDL_Quit();
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	123
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	124 return 0;
20326ba2bda2 This name inconsistency has been bugging me for a while... Sam Lantinga <slouken@libsdl.org> parents: diff changeset	125 }

Mercurial > sdl-ios-xcode

annotate Xcode-iPhoneOS/Demos/src/touch.c @ 3468:789b97008d8a