Mercurial > sdl-ios-xcode
annotate XCodeiPhoneOS/Demos/src/touch.c @ 3097:0d12e8f1de3c
Date: Thu, 05 Feb 2009 18:07:35 +0100
From: Stefan Klug
Subject: [SDL] SDL 1.3 WinCE backend
as promised, I've started to work on the WinCE backend of SDL 1.3
I've modified the win32 video backend and the gdi renderer, to work
properly in WinCE.
The results till now are great, but there is still some work to do.
Attached are two patches with my changes.
I would be happy if someone could review and propably commit them.
The first one (configure.in.patch) should be straight forward without
any side effects.
The second one does the necessary changes to the win32 backend. I was
really unhappy to start slicing this shiny new backend with
#ifdef/#endif but I saw no other option.
The most problematic issues are:
- WinCe has no GetDIBits, so its practically impossible to fill a
BITMAPINFO with correct values. I therefore removed the bmi member from
the GDI_RenderData in SDL_gdirender.c to prevent usage of a not or not
properly initialized bmi.
- In SDL_win32window.c I exchanged some ASCII function by their general
counterparts, (In CE only the Unicode versions are available). I don't
know if this has a negative effect when running in win32
Cheers
Stefan
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 23 Mar 2009 05:35:21 +0000 |
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1 /* |
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2 * touch.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 BRUSH_SIZE 32 /* width and height of the brush */ |
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12 #define PIXELS_PER_ITERATION 5 /* number of pixels between brush blots when forming a line */ |
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13 |
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14 static SDL_TextureID brushID = 0; /* texture for the brush */ |
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15 |
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16 /* |
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17 draws a line from (startx, starty) to (startx + dx, starty + dy) |
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18 this is accomplished by drawing several blots spaced PIXELS_PER_ITERATION apart |
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19 */ |
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20 void |
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21 drawLine(float startx, float starty, float dx, float dy) |
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22 { |
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23 |
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24 float distance = sqrt(dx * dx + dy * dy); /* length of line segment (pythagoras) */ |
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25 int iterations = distance / PIXELS_PER_ITERATION + 1; /* number of brush sprites to draw for the line */ |
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26 float dx_prime = dx / iterations; /* x-shift per iteration */ |
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27 float dy_prime = dy / iterations; /* y-shift per iteration */ |
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28 SDL_Rect dstRect; /* rect to draw brush sprite into */ |
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29 |
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30 dstRect.w = BRUSH_SIZE; |
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31 dstRect.h = BRUSH_SIZE; |
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32 |
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33 /* setup x and y for the location of the first sprite */ |
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34 float x = startx - BRUSH_SIZE / 2.0f; |
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35 float y = starty - BRUSH_SIZE / 2.0f; |
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36 |
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37 int i; |
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38 /* draw a series of blots to form the line */ |
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39 for (i = 0; i < iterations; i++) { |
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40 dstRect.x = x; |
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41 dstRect.y = y; |
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42 /* shift x and y for next sprite location */ |
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43 x += dx_prime; |
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44 y += dy_prime; |
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45 /* draw brush blot */ |
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46 SDL_RenderCopy(brushID, NULL, &dstRect); |
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47 } |
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48 } |
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49 |
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50 /* |
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51 loads the brush texture |
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52 */ |
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53 void |
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54 initializeTexture() |
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55 { |
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56 SDL_Surface *bmp_surface; |
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57 bmp_surface = SDL_LoadBMP("stroke.bmp"); |
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58 if (bmp_surface == NULL) { |
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59 fatalError("could not load stroke.bmp"); |
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60 } |
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61 brushID = |
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62 SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, bmp_surface); |
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63 SDL_FreeSurface(bmp_surface); |
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64 if (brushID == 0) { |
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65 fatalError("could not create brush texture"); |
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66 } |
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67 /* additive blending -- laying strokes on top of eachother makes them brighter */ |
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68 SDL_SetTextureBlendMode(brushID, SDL_BLENDMODE_ADD); |
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69 /* set brush color (red) */ |
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70 SDL_SetTextureColorMod(brushID, 255, 100, 100); |
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71 } |
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72 |
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73 int |
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74 main(int argc, char *argv[]) |
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75 { |
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76 |
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77 int x, y, dx, dy; /* mouse location */ |
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78 Uint8 state; /* mouse (touch) state */ |
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79 SDL_Event event; |
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80 SDL_WindowID windowID; /* main window */ |
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81 int done; /* does user want to quit? */ |
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82 |
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83 /* initialize SDL */ |
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84 if (SDL_Init(SDL_INIT_VIDEO) < 0) { |
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85 fatalError("Could not initialize SDL"); |
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86 } |
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87 |
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88 /* create main window and renderer */ |
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89 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, |
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90 SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | |
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91 SDL_WINDOW_BORDERLESS); |
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92 SDL_CreateRenderer(windowID, 0, 0); |
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93 |
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94 /*load brush texture */ |
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95 initializeTexture(); |
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96 |
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97 /* fill canvass initially with all black */ |
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99 SDL_RenderFill(NULL); | |
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100 SDL_RenderPresent(); |
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101 |
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102 done = 0; |
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103 while (!done && SDL_WaitEvent(&event)) { |
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104 switch (event.type) { |
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105 case SDL_QUIT: |
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106 done = 1; |
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107 break; |
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108 case SDL_MOUSEMOTION: |
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109 SDL_SelectMouse(event.motion.which); /* select 'mouse' (touch) that moved */ |
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110 state = SDL_GetMouseState(&x, &y); /* get its location */ |
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111 SDL_GetRelativeMouseState(&dx, &dy); /* find how much the mouse moved */ |
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112 if (state & SDL_BUTTON_LMASK) { /* is the mouse (touch) down? */ |
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113 drawLine(x - dx, y - dy, dx, dy); /* draw line segment */ |
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114 SDL_RenderPresent(); |
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115 } |
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116 break; |
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117 } |
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118 } |
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119 |
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120 /* cleanup */ |
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121 SDL_DestroyTexture(brushID); |
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122 SDL_Quit(); |
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123 |
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124 return 0; |
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Sam Lantinga <slouken@libsdl.org>
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diff
changeset
|
125 } |