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annotate test/graywin.c @ 4097:c5169b89787f SDL-1.2

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Removed stray C++ comment
author Sam Lantinga <slouken@libsdl.org>
date Fri, 28 Dec 2007 07:50:01 +0000
parents d33645c36072
children 782fd950bd46 c121d94672cb
rev   line source
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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, int width, int height)
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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 Uint32 randc;
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24
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25 /* Seed the random number generator */
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26 if ( seeded == 0 ) {
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27 srand(time(NULL));
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28 seeded = 1;
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29 }
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30
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31 /* Get the bounds of the rectangle */
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32 area.w = (rand()%width);
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33 area.h = (rand()%height);
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34 area.x = X-(area.w/2);
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35 area.y = Y-(area.h/2);
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36 randc = (rand()%NUM_COLORS);
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37
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38 if (screen->format->BytesPerPixel==1)
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39 {
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40 color = randc;
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41 }
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42 else
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43 {
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44 color = SDL_MapRGB(screen->format, randc, randc, randc);
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45 }
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46
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47 /* Do it! */
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48 SDL_FillRect(screen, &area, color);
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49 if ( screen->flags & SDL_DOUBLEBUF ) {
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50 SDL_Flip(screen);
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51 } else {
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52 SDL_UpdateRects(screen, 1, &area);
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53 }
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54 }
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55
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56 void DrawBackground(SDL_Surface *screen)
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57 {
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58 int i, j, k;
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59 Uint8 *buffer;
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60 Uint16 *buffer16;
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61 Uint16 color;
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62 Uint8 gradient;
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63
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64 /* Set the surface pixels and refresh! */
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65 /* Use two loops in case the surface is double-buffered (both sides) */
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66
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67 for ( j=0; j<2; ++j ) {
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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;
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72 }
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73 buffer = (Uint8 *)screen->pixels;
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74
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75 if (screen->format->BytesPerPixel!=2) {
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76 for ( i=0; i<screen->h; ++i ) {
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77 memset(buffer,(i*(NUM_COLORS-1))/screen->h, screen->w * screen->format->BytesPerPixel);
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78 buffer += screen->pitch;
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79 }
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80 }
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81 else
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82 {
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83 for ( i=0; i<screen->h; ++i ) {
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84 gradient=((i*(NUM_COLORS-1))/screen->h);
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85 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
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86 buffer16=(Uint16*)buffer;
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87 for (k=0; k<screen->w; k++)
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88 {
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89 *(buffer16+k)=color;
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90 }
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91 buffer += screen->pitch;
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92 }
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93 }
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94
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95 SDL_UnlockSurface(screen);
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96 if ( screen->flags & SDL_DOUBLEBUF ) {
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97 SDL_Flip(screen);
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98 } else {
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99 SDL_UpdateRect(screen, 0, 0, 0, 0);
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100 break;
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101 }
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102 }
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103 }
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104
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105 SDL_Surface *CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags)
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106 {
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107 SDL_Surface *screen;
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108 int i;
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109 SDL_Color palette[NUM_COLORS];
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110
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111 /* Set the video mode */
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112 screen = SDL_SetVideoMode(w, h, bpp, flags);
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113 if ( screen == NULL ) {
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114 fprintf(stderr, "Couldn't set display mode: %s\n",
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115 SDL_GetError());
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116 return(NULL);
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117 }
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118 fprintf(stderr, "Screen is in %s mode\n",
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119 (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
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120
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121 if (bpp==8) {
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122 /* Set a gray colormap, reverse order from white to black */
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123 for ( i=0; i<NUM_COLORS; ++i ) {
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124 palette[i].r = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
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125 palette[i].g = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
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126 palette[i].b = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
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127 }
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128 SDL_SetColors(screen, palette, 0, NUM_COLORS);
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129 }
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130
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131 return(screen);
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132 }
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133
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134 int main(int argc, char *argv[])
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135 {
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136 SDL_Surface *screen;
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137 Uint32 videoflags;
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138 int done;
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139 SDL_Event event;
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140 int width, height, bpp;
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141
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142 /* Initialize SDL */
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143 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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144 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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145 exit(1);
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146 }
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147
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148 /* See if we try to get a hardware colormap */
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149 width = 640;
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150 height = 480;
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151 bpp = 8;
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152 videoflags = SDL_SWSURFACE;
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153 while ( argc > 1 ) {
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154 --argc;
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155 if ( argv[argc-1] && (strcmp(argv[argc-1], "-width") == 0) ) {
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156 width = atoi(argv[argc]);
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157 --argc;
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158 } else
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159 if ( argv[argc-1] && (strcmp(argv[argc-1], "-height") == 0) ) {
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160 height = atoi(argv[argc]);
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161 --argc;
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162 } else
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163 if ( argv[argc-1] && (strcmp(argv[argc-1], "-bpp") == 0) ) {
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164 bpp = atoi(argv[argc]);
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165 --argc;
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166 } else
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167 if ( argv[argc] && (strcmp(argv[argc], "-hw") == 0) ) {
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168 videoflags |= SDL_HWSURFACE;
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169 } else
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170 if ( argv[argc] && (strcmp(argv[argc], "-hwpalette") == 0) ) {
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171 videoflags |= SDL_HWPALETTE;
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172 } else
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173 if ( argv[argc] && (strcmp(argv[argc], "-flip") == 0) ) {
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174 videoflags |= SDL_DOUBLEBUF;
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175 } else
0
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176 if ( argv[argc] && (strcmp(argv[argc], "-noframe") == 0) ) {
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177 videoflags |= SDL_NOFRAME;
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178 } else
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179 if ( argv[argc] && (strcmp(argv[argc], "-resize") == 0) ) {
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180 videoflags |= SDL_RESIZABLE;
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181 } else
0
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182 if ( argv[argc] && (strcmp(argv[argc], "-fullscreen") == 0) ) {
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183 videoflags |= SDL_FULLSCREEN;
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184 } else {
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185 fprintf(stderr, "Usage: %s [-width] [-height] [-bpp] [-hw] [-hwpalette] [-flip] [-noframe] [-fullscreen] [-resize]\n",
0
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186 argv[0]);
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187 exit(1);
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188 }
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189 }
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190
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191 /* Set a video mode */
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192 screen = CreateScreen(width, height, bpp, videoflags);
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193 if ( screen == NULL ) {
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194 exit(2);
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195 }
691
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196
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197 DrawBackground(screen);
0
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198
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199 /* Wait for a keystroke */
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200 done = 0;
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201 while ( !done && SDL_WaitEvent(&event) ) {
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202 switch (event.type) {
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203 case SDL_MOUSEBUTTONDOWN:
380
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204 DrawBox(screen, event.button.x, event.button.y, width, height);
0
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205 break;
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206 case SDL_KEYDOWN:
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207 /* Ignore ALT-TAB for windows */
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208 if ( (event.key.keysym.sym == SDLK_LALT) ||
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209 (event.key.keysym.sym == SDLK_TAB) ) {
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210 break;
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211 }
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212 /* Center the mouse on <SPACE> */
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213 if ( event.key.keysym.sym == SDLK_SPACE ) {
380
bce7171e7a85 Date: Wed, 22 May 2002 22:30:58 +0300
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parents: 0
diff changeset
214 SDL_WarpMouse(width/2, height/2);
0
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215 break;
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216 }
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217 /* Toggle fullscreen mode on <RETURN> */
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diff changeset
218 if ( event.key.keysym.sym == SDLK_RETURN ) {
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diff changeset
219 videoflags ^= SDL_FULLSCREEN;
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220 screen = CreateScreen(
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diff changeset
221 screen->w, screen->h,
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222 screen->format->BitsPerPixel,
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diff changeset
223 videoflags);
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diff changeset
224 if ( screen == NULL ) {
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diff changeset
225 fprintf(stderr,
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diff changeset
226 "Couldn't toggle fullscreen mode\n");
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diff changeset
227 done = 1;
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diff changeset
228 }
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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parents: 538
diff changeset
229 DrawBackground(screen);
0
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diff changeset
230 break;
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diff changeset
231 }
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diff changeset
232 /* Any other key quits the application... */
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diff changeset
233 case SDL_QUIT:
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diff changeset
234 done = 1;
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parents:
diff changeset
235 break;
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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parents: 538
diff changeset
236 case SDL_VIDEOEXPOSE:
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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diff changeset
237 DrawBackground(screen);
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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diff changeset
238 break;
945
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239 case SDL_VIDEORESIZE:
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240 screen = CreateScreen(
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diff changeset
241 event.resize.w, event.resize.h,
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242 screen->format->BitsPerPixel,
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diff changeset
243 videoflags);
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diff changeset
244 if ( screen == NULL ) {
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diff changeset
245 fprintf(stderr,
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diff changeset
246 "Couldn't resize video mode\n");
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diff changeset
247 done = 1;
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diff changeset
248 }
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249 DrawBackground(screen);
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diff changeset
250 break;
0
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parents:
diff changeset
251 default:
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diff changeset
252 break;
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parents:
diff changeset
253 }
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diff changeset
254 }
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diff changeset
255 SDL_Quit();
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diff changeset
256 return(0);
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parents:
diff changeset
257 }