annotate test/graywin.c @ 217:add626b825bb

Use the sticky focus flag so audio isn't muted when application is switched.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 25 Oct 2001 08:45:17 +0000
parents 74212992fb08
children bce7171e7a85
rev   line source
0
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1
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2 /* Simple program: Fill a colormap with gray and stripe it down the screen */
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3
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4 #include <stdio.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7 #include <time.h>
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8
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9 #include "SDL.h"
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10
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11 #ifdef TEST_VGA16 /* Define this if you want to test VGA 16-color video modes */
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12 #define NUM_COLORS 16
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13 #else
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14 #define NUM_COLORS 256
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15 #endif
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16
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17 /* Draw a randomly sized and colored box centered about (X,Y) */
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18 void DrawBox(SDL_Surface *screen, int X, int Y)
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19 {
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20 static unsigned int seeded = 0;
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21 SDL_Rect area;
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22 Uint32 color;
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23
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24 /* Seed the random number generator */
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25 if ( seeded == 0 ) {
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26 srand(time(NULL));
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27 seeded = 1;
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28 }
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29
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30 /* Get the bounds of the rectangle */
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31 area.w = (rand()%640);
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32 area.h = (rand()%480);
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33 area.x = X-(area.w/2);
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34 area.y = Y-(area.h/2);
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35 color = (rand()%NUM_COLORS);
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36
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37 /* Do it! */
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38 SDL_FillRect(screen, &area, color);
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39 SDL_UpdateRects(screen, 1, &area);
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40 }
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41
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42 SDL_Surface *CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags)
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43 {
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44 SDL_Surface *screen;
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45 int i;
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46 SDL_Color palette[NUM_COLORS];
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47 Uint8 *buffer;
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48
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49 /* Set the video mode */
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50 screen = SDL_SetVideoMode(w, h, bpp, flags);
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51 if ( screen == NULL ) {
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52 fprintf(stderr, "Couldn't set display mode: %s\n",
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53 SDL_GetError());
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54 return(NULL);
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55 }
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56 fprintf(stderr, "Screen is in %s mode\n",
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57 (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
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58
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59 /* Set a gray colormap, reverse order from white to black */
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60 for ( i=0; i<NUM_COLORS; ++i ) {
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61 palette[i].r = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
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62 palette[i].g = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
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63 palette[i].b = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
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64 }
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65 SDL_SetColors(screen, palette, 0, NUM_COLORS);
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66
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67 /* Set the surface pixels and refresh! */
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68 if ( SDL_LockSurface(screen) < 0 ) {
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69 fprintf(stderr, "Couldn't lock display surface: %s\n",
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70 SDL_GetError());
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71 return(NULL);
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72 }
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73 buffer = (Uint8 *)screen->pixels;
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74 for ( i=0; i<screen->h; ++i ) {
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75 memset(buffer,(i*(NUM_COLORS-1))/screen->h, screen->w);
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76 buffer += screen->pitch;
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77 }
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78 SDL_UnlockSurface(screen);
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79 SDL_UpdateRect(screen, 0, 0, 0, 0);
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80
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81 return(screen);
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82 }
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83
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84 int main(int argc, char *argv[])
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85 {
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86 SDL_Surface *screen;
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87 Uint32 videoflags;
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88 int done;
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89 SDL_Event event;
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90 int width, height, bpp;
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91
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92 /* Initialize SDL */
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93 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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94 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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95 exit(1);
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96 }
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97
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98 /* See if we try to get a hardware colormap */
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99 width = 640;
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100 height = 480;
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101 bpp = 8;
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102 videoflags = SDL_SWSURFACE;
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103 while ( argc > 1 ) {
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104 --argc;
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105 if ( argv[argc-1] && (strcmp(argv[argc-1], "-width") == 0) ) {
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106 width = atoi(argv[argc]);
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107 --argc;
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108 } else
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109 if ( argv[argc-1] && (strcmp(argv[argc-1], "-height") == 0) ) {
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110 height = atoi(argv[argc]);
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111 --argc;
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112 } else
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113 if ( argv[argc-1] && (strcmp(argv[argc-1], "-bpp") == 0) ) {
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114 bpp = atoi(argv[argc]);
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115 --argc;
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116 } else
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117 if ( argv[argc] && (strcmp(argv[argc], "-hw") == 0) ) {
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118 videoflags |= SDL_HWSURFACE;
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119 } else
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120 if ( argv[argc] && (strcmp(argv[argc], "-hwpalette") == 0) ) {
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121 videoflags |= SDL_HWPALETTE;
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122 } else
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123 if ( argv[argc] && (strcmp(argv[argc], "-noframe") == 0) ) {
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124 videoflags |= SDL_NOFRAME;
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125 } else
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126 if ( argv[argc] && (strcmp(argv[argc], "-fullscreen") == 0) ) {
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127 videoflags |= SDL_FULLSCREEN;
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128 } else {
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129 fprintf(stderr, "Usage: %s [-warp] [-fullscreen]\n",
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130 argv[0]);
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131 exit(1);
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132 }
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133 }
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134
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135 /* Set a video mode */
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136 screen = CreateScreen(width, height, bpp, videoflags);
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137 if ( screen == NULL ) {
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138 exit(2);
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139 }
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140
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141 /* Wait for a keystroke */
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142 done = 0;
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143 while ( !done && SDL_WaitEvent(&event) ) {
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144 switch (event.type) {
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145 case SDL_MOUSEBUTTONDOWN:
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146 DrawBox(screen, event.button.x, event.button.y);
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147 break;
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148 case SDL_KEYDOWN:
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149 /* Ignore ALT-TAB for windows */
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150 if ( (event.key.keysym.sym == SDLK_LALT) ||
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151 (event.key.keysym.sym == SDLK_TAB) ) {
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152 break;
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153 }
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154 /* Center the mouse on <SPACE> */
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155 if ( event.key.keysym.sym == SDLK_SPACE ) {
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156 SDL_WarpMouse(640/2, 480/2);
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157 break;
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158 }
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159 /* Toggle fullscreen mode on <RETURN> */
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160 if ( event.key.keysym.sym == SDLK_RETURN ) {
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161 videoflags ^= SDL_FULLSCREEN;
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162 screen = CreateScreen(
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163 screen->w, screen->h,
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164 screen->format->BitsPerPixel,
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165 videoflags);
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166 if ( screen == NULL ) {
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167 fprintf(stderr,
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168 "Couldn't toggle fullscreen mode\n");
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169 done = 1;
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170 }
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171 break;
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172 }
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173 /* Any other key quits the application... */
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174 case SDL_QUIT:
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175 done = 1;
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176 break;
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177 default:
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178 break;
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179 }
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180 }
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181 SDL_Quit();
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182 return(0);
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183 }