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comparison Xcode-iPhoneOS/Demos/src/touch.c @ 3685:64ce267332c6

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Switched from SDL_WindowID and SDL_TextureID to SDL_Window* and SDL_Texture* for code simplicity and improved performance.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 21 Jan 2010 06:21:52 +0000
parents 20326ba2bda2
children 06c7423f8c60
comparison
equal deleted inserted replaced
3684:cc564f08884f 3685:64ce267332c6
9 #include "common.h" 9 #include "common.h"
10 10
11 #define BRUSH_SIZE 32 /* width and height of the brush */ 11 #define BRUSH_SIZE 32 /* width and height of the brush */
12 #define PIXELS_PER_ITERATION 5 /* number of pixels between brush blots when forming a line */ 12 #define PIXELS_PER_ITERATION 5 /* number of pixels between brush blots when forming a line */
13 13
14 static SDL_TextureID brushID = 0; /* texture for the brush */ 14 static SDL_Texture *brush = 0; /* texture for the brush */
15 15
16 /* 16 /*
17 draws a line from (startx, starty) to (startx + dx, starty + dy) 17 draws a line from (startx, starty) to (startx + dx, starty + dy)
18 this is accomplished by drawing several blots spaced PIXELS_PER_ITERATION apart 18 this is accomplished by drawing several blots spaced PIXELS_PER_ITERATION apart
19 */ 19 */
41 dstRect.y = y; 41 dstRect.y = y;
42 /* shift x and y for next sprite location */ 42 /* shift x and y for next sprite location */
43 x += dx_prime; 43 x += dx_prime;
44 y += dy_prime; 44 y += dy_prime;
45 /* draw brush blot */ 45 /* draw brush blot */
46 SDL_RenderCopy(brushID, NULL, &dstRect); 46 SDL_RenderCopy(brush, NULL, &dstRect);
47 } 47 }
48 } 48 }
49 49
50 /* 50 /*
51 loads the brush texture 51 loads the brush texture
56 SDL_Surface *bmp_surface; 56 SDL_Surface *bmp_surface;
57 bmp_surface = SDL_LoadBMP("stroke.bmp"); 57 bmp_surface = SDL_LoadBMP("stroke.bmp");
58 if (bmp_surface == NULL) { 58 if (bmp_surface == NULL) {
59 fatalError("could not load stroke.bmp"); 59 fatalError("could not load stroke.bmp");
60 } 60 }
61 brushID = 61 brush =
62 SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, bmp_surface); 62 SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, bmp_surface);
63 SDL_FreeSurface(bmp_surface); 63 SDL_FreeSurface(bmp_surface);
64 if (brushID == 0) { 64 if (brush == 0) {
65 fatalError("could not create brush texture"); 65 fatalError("could not create brush texture");
66 } 66 }
67 /* additive blending -- laying strokes on top of eachother makes them brighter */ 67 /* additive blending -- laying strokes on top of eachother makes them brighter */
68 SDL_SetTextureBlendMode(brushID, SDL_BLENDMODE_ADD); 68 SDL_SetTextureBlendMode(brush, SDL_BLENDMODE_ADD);
69 /* set brush color (red) */ 69 /* set brush color (red) */
70 SDL_SetTextureColorMod(brushID, 255, 100, 100); 70 SDL_SetTextureColorMod(brush, 255, 100, 100);
71 } 71 }
72 72
73 int 73 int
74 main(int argc, char *argv[]) 74 main(int argc, char *argv[])
75 { 75 {
76 76
77 int x, y, dx, dy; /* mouse location */ 77 int x, y, dx, dy; /* mouse location */
78 Uint8 state; /* mouse (touch) state */ 78 Uint8 state; /* mouse (touch) state */
79 SDL_Event event; 79 SDL_Event event;
80 SDL_WindowID windowID; /* main window */ 80 SDL_Window *window; /* main window */
81 int done; /* does user want to quit? */ 81 int done; /* does user want to quit? */
82 82
83 /* initialize SDL */ 83 /* initialize SDL */
84 if (SDL_Init(SDL_INIT_VIDEO) < 0) { 84 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
85 fatalError("Could not initialize SDL"); 85 fatalError("Could not initialize SDL");
86 } 86 }
87 87
88 /* create main window and renderer */ 88 /* create main window and renderer */
89 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 89 window = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
90 SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | 90 SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN |
91 SDL_WINDOW_BORDERLESS); 91 SDL_WINDOW_BORDERLESS);
92 SDL_CreateRenderer(windowID, 0, 0); 92 SDL_CreateRenderer(window, 0, 0);
93 93
94 /*load brush texture */ 94 /*load brush texture */
95 initializeTexture(); 95 initializeTexture();
96 96
97 /* fill canvass initially with all black */ 97 /* fill canvass initially with all black */
116 break; 116 break;
117 } 117 }
118 } 118 }
119 119
120 /* cleanup */ 120 /* cleanup */
121 SDL_DestroyTexture(brushID); 121 SDL_DestroyTexture(brush);
122 SDL_Quit(); 122 SDL_Quit();
123 123
124 return 0; 124 return 0;
125 } 125 }