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annotate test/graywin.c @ 1698:412149a1c756 SDL-1.3

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Renamed, per Mike's comment on bug #157
author Sam Lantinga <slouken@libsdl.org>
date Wed, 21 Jun 2006 08:25:17 +0000
parents 4da1ee79c9af
children 6c63fc2bd986
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
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19 DrawBox(SDL_Surface * screen, int X, int Y, int width, int height)
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20 {
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21 static unsigned int seeded = 0;
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22 SDL_Rect area;
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23 Uint32 color;
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24 Uint32 randc;
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25
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26 /* Seed the random number generator */
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27 if (seeded == 0) {
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28 srand(time(NULL));
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29 seeded = 1;
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30 }
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31
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32 /* Get the bounds of the rectangle */
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33 area.w = (rand() % width);
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34 area.h = (rand() % height);
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35 area.x = X - (area.w / 2);
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36 area.y = Y - (area.h / 2);
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37 randc = (rand() % NUM_COLORS);
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38
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39 if (screen->format->BytesPerPixel == 1) {
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40 color = randc;
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41 } else {
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42 color = SDL_MapRGB(screen->format, randc, randc, randc);
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43 }
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44
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45 /* Do it! */
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46 SDL_FillRect(screen, &area, color);
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47 if (screen->flags & SDL_DOUBLEBUF) {
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48 SDL_Flip(screen);
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49 } else {
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50 SDL_UpdateRects(screen, 1, &area);
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51 }
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52 }
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53
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54 void
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55 DrawBackground(SDL_Surface * screen)
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56 {
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57 int i, j, k;
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58 Uint8 *buffer;
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59 Uint16 *buffer16;
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60 Uint16 color;
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61 Uint8 gradient;
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62
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63 /* Set the surface pixels and refresh! */
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64 /* Use two loops in case the surface is double-buffered (both sides) */
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65
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66 for (j = 0; j < 2; ++j) {
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67 if (SDL_LockSurface(screen) < 0) {
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68 fprintf(stderr, "Couldn't lock display surface: %s\n",
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69 SDL_GetError());
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70 return;
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71 }
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72 buffer = (Uint8 *) screen->pixels;
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73
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74 if (screen->format->BytesPerPixel != 2) {
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75 for (i = 0; i < screen->h; ++i) {
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76 memset(buffer, (i * (NUM_COLORS - 1)) / screen->h,
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77 screen->w * screen->format->BytesPerPixel);
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78 buffer += screen->pitch;
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79 }
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80 } else {
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81 for (i = 0; i < screen->h; ++i) {
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82 gradient = ((i * (NUM_COLORS - 1)) / screen->h);
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83 color =
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84 SDL_MapRGB(screen->format, gradient, gradient, gradient);
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85 buffer16 = (Uint16 *) buffer;
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86 for (k = 0; k < screen->w; k++) {
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87 *(buffer16 + k) = color;
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88 }
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89 buffer += screen->pitch;
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90 }
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91 }
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92
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93 SDL_UnlockSurface(screen);
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94 if (screen->flags & SDL_DOUBLEBUF) {
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95 SDL_Flip(screen);
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96 } else {
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97 SDL_UpdateRect(screen, 0, 0, 0, 0);
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98 break;
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99 }
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100 }
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101 }
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102
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103 SDL_Surface *
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104 CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags)
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105 {
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106 SDL_Surface *screen;
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107 int i;
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108 SDL_Color palette[NUM_COLORS];
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109
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110 /* Set the video mode */
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111 screen = SDL_SetVideoMode(w, h, bpp, flags);
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112 if (screen == NULL) {
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113 fprintf(stderr, "Couldn't set display mode: %s\n", SDL_GetError());
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114 return (NULL);
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115 }
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116 fprintf(stderr, "Screen is in %s mode\n",
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117 (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
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118
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119 if (bpp == 8) {
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120 /* Set a gray colormap, reverse order from white to black */
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121 for (i = 0; i < NUM_COLORS; ++i) {
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122 palette[i].r = (NUM_COLORS - 1) - i * (256 / NUM_COLORS);
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123 palette[i].g = (NUM_COLORS - 1) - i * (256 / NUM_COLORS);
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124 palette[i].b = (NUM_COLORS - 1) - i * (256 / NUM_COLORS);
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125 }
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126 SDL_SetColors(screen, palette, 0, NUM_COLORS);
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127 }
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128
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129 return (screen);
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130 }
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131
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132 int
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133 main(int argc, char *argv[])
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134 {
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135 SDL_Surface *screen;
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136 Uint32 videoflags;
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137 int done;
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138 SDL_Event event;
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139 int width, height, bpp;
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140
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141 /* Initialize SDL */
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142 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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143 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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144 exit(1);
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145 }
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146
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147 /* See if we try to get a hardware colormap */
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148 width = 640;
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149 height = 480;
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150 bpp = 8;
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151 videoflags = SDL_SWSURFACE;
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152 while (argc > 1) {
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153 --argc;
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154 if (argv[argc - 1] && (strcmp(argv[argc - 1], "-width") == 0)) {
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155 width = atoi(argv[argc]);
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156 --argc;
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157 } else if (argv[argc - 1]
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158 && (strcmp(argv[argc - 1], "-height") == 0)) {
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159 height = atoi(argv[argc]);
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160 --argc;
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161 } else if (argv[argc - 1] && (strcmp(argv[argc - 1], "-bpp") == 0)) {
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162 bpp = atoi(argv[argc]);
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163 --argc;
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164 } else if (argv[argc] && (strcmp(argv[argc], "-hw") == 0)) {
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165 videoflags |= SDL_HWSURFACE;
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166 } else if (argv[argc] && (strcmp(argv[argc], "-hwpalette") == 0)) {
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167 videoflags |= SDL_HWPALETTE;
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168 } else if (argv[argc] && (strcmp(argv[argc], "-flip") == 0)) {
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169 videoflags |= SDL_DOUBLEBUF;
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170 } else if (argv[argc] && (strcmp(argv[argc], "-noframe") == 0)) {
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171 videoflags |= SDL_NOFRAME;
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172 } else if (argv[argc] && (strcmp(argv[argc], "-resize") == 0)) {
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173 videoflags |= SDL_RESIZABLE;
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174 } else if (argv[argc] && (strcmp(argv[argc], "-fullscreen") == 0)) {
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175 videoflags |= SDL_FULLSCREEN;
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176 } else {
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177 fprintf(stderr,
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178 "Usage: %s [-width] [-height] [-bpp] [-hw] [-hwpalette] [-flip] [-noframe] [-fullscreen] [-resize]\n",
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179 argv[0]);
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180 exit(1);
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181 }
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182 }
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183
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184 /* Set a video mode */
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185 screen = CreateScreen(width, height, bpp, videoflags);
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186 if (screen == NULL) {
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187 exit(2);
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188 }
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189
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190 DrawBackground(screen);
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191
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192 /* Wait for a keystroke */
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193 done = 0;
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194 while (!done && SDL_WaitEvent(&event)) {
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195 switch (event.type) {
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196 case SDL_MOUSEBUTTONDOWN:
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197 DrawBox(screen, event.button.x, event.button.y, width, height);
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198 break;
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199 case SDL_KEYDOWN:
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200 /* Ignore ALT-TAB for windows */
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201 if ((event.key.keysym.sym == SDLK_LALT) ||
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202 (event.key.keysym.sym == SDLK_TAB)) {
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203 break;
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204 }
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205 /* Center the mouse on <SPACE> */
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206 if (event.key.keysym.sym == SDLK_SPACE) {
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207 SDL_WarpMouse(width / 2, height / 2);
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208 break;
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209 }
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210 /* Toggle fullscreen mode on <RETURN> */
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211 if (event.key.keysym.sym == SDLK_RETURN) {
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212 videoflags ^= SDL_FULLSCREEN;
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213 screen = CreateScreen(screen->w, screen->h,
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214 screen->format->BitsPerPixel,
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215 videoflags);
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216 if (screen == NULL) {
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217 fprintf(stderr, "Couldn't toggle fullscreen mode\n");
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218 done = 1;
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219 }
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220 DrawBackground(screen);
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221 break;
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222 }
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223 /* Any other key quits the application... */
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224 case SDL_QUIT:
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225 done = 1;
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226 break;
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227 case SDL_VIDEOEXPOSE:
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228 DrawBackground(screen);
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229 break;
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230 case SDL_VIDEORESIZE:
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231 screen = CreateScreen(event.resize.w, event.resize.h,
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232 screen->format->BitsPerPixel, videoflags);
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233 if (screen == NULL) {
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234 fprintf(stderr, "Couldn't resize video mode\n");
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235 done = 1;
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236 }
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237 DrawBackground(screen);
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238 break;
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239 default:
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240 break;
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241 }
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242 }
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243 SDL_Quit();
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244 return (0);
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245 }