annotate test/testalpha.c @ 1157:baf35853ad54

Date: Mon, 10 Oct 2005 13:09:32 +0300 From: Tommi Kyntola <tommi.kyntola@ray.fi> To: sdl@libsdl.org Subject: [SDL] [RFC] get_ticks broken on linux It uses gettimeofday to calculate the timedifference. Gettimeofday returns current time which is seldom monotonous. This breaks SDL timer subsystem. (time callbacks and all that get borked when the time difference ms is suddenly ~ 2^32) I posted a message about this earlier but got no response. Some thoughts on this matter would be appreciated. (Or even an explanation for the lack of interest.) A patch below would use the posix timers that have been around since posix 93 and do provide a good source of monotonous time on linux boxes (and on few others too). The following patch is also availabe at: http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch It's against 1.2.9, but I can easily rediffit against the cvs branch is needed. cheers, Tommi Kyntola tommi.kyntola@ray.fi
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 11 Oct 2005 18:16:12 +0000
parents 51a8702d8ecd
children 23b1ef7d003b
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 Then move an alpha valued sprite around the screen.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <math.h>
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10
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11 #include "SDL.h"
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12
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13 #define FRAME_TICKS (1000/30) /* 30 frames/second */
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14
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15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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16 static void quit(int rc)
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17 {
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18 SDL_Quit();
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19 exit(rc);
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20 }
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21
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22
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23 /* Create a "light" -- a yellowish surface with variable alpha */
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24 SDL_Surface *CreateLight(SDL_Surface *screen, int radius)
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25 {
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26 Uint8 trans, alphamask;
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27 int range, addition;
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28 int xdist, ydist;
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29 Uint16 x, y;
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30 Uint16 skip;
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31 Uint32 pixel;
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32 SDL_Surface *light;
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33
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34 #ifdef LIGHT_16BIT
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35 Uint16 *buf;
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36
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37 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
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38 /* Note: this isn't any faster than a 32 bit alpha surface */
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39 alphamask = 0x0000000F;
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40 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16,
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41 0x0000F000, 0x00000F00, 0x000000F0, alphamask);
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42 #else
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43 Uint32 *buf;
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44
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45 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
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46 alphamask = 0x000000FF;
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47 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32,
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48 0xFF000000, 0x00FF0000, 0x0000FF00, alphamask);
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49 if ( light == NULL ) {
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50 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError());
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51 return(NULL);
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52 }
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53 #endif
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54
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55 /* Fill with a light yellow-orange color */
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56 skip = light->pitch-(light->w*light->format->BytesPerPixel);
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57 #ifdef LIGHT_16BIT
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58 buf = (Uint16 *)light->pixels;
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59 #else
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60 buf = (Uint32 *)light->pixels;
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61 #endif
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62 /* Get a tranparent pixel value - we'll add alpha later */
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63 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0);
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64 for ( y=0; y<light->h; ++y ) {
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65 for ( x=0; x<light->w; ++x ) {
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66 *buf++ = pixel;
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67 }
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68 buf += skip; /* Almost always 0, but just in case... */
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69 }
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70
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71 /* Calculate alpha values for the surface. */
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72 #ifdef LIGHT_16BIT
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73 buf = (Uint16 *)light->pixels;
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74 #else
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75 buf = (Uint32 *)light->pixels;
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76 #endif
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77 for ( y=0; y<light->h; ++y ) {
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78 for ( x=0; x<light->w; ++x ) {
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79 /* Slow distance formula (from center of light) */
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80 xdist = x-(light->w/2);
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81 ydist = y-(light->h/2);
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82 range = (int)sqrt(xdist*xdist+ydist*ydist);
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83
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84 /* Scale distance to range of transparency (0-255) */
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85 if ( range > radius ) {
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86 trans = alphamask;
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87 } else {
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88 /* Increasing transparency with distance */
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89 trans = (Uint8)((range*alphamask)/radius);
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90
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91 /* Lights are very transparent */
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92 addition = (alphamask+1)/8;
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93 if ( (int)trans+addition > alphamask ) {
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94 trans = alphamask;
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95 } else {
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96 trans += addition;
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97 }
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98 }
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99 /* We set the alpha component as the right N bits */
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100 *buf++ |= (255-trans);
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101 }
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102 buf += skip; /* Almost always 0, but just in case... */
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103 }
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104 /* Enable RLE acceleration of this alpha surface */
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105 SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0);
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106
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107 /* We're done! */
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108 return(light);
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109 }
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110
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111 static Uint32 flashes = 0;
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112 static Uint32 flashtime = 0;
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113
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114 void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y)
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115 {
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116 SDL_Rect position;
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117 Uint32 ticks1;
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118 Uint32 ticks2;
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119
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120 /* Easy, center light */
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121 position.x = x-(light->w/2);
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122 position.y = y-(light->h/2);
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123 position.w = light->w;
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124 position.h = light->h;
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125 ticks1 = SDL_GetTicks();
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126 SDL_BlitSurface(light, NULL, screen, &position);
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127 ticks2 = SDL_GetTicks();
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128 SDL_UpdateRects(screen, 1, &position);
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129 ++flashes;
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130
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131 /* Update time spend doing alpha blitting */
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132 flashtime += (ticks2-ticks1);
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133 }
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134
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135 static int sprite_visible = 0;
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136 static SDL_Surface *sprite;
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137 static SDL_Surface *backing;
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138 static SDL_Rect position;
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139 static int x_vel, y_vel;
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140 static int alpha_vel;
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141
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142 int LoadSprite(SDL_Surface *screen, char *file)
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143 {
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144 SDL_Surface *converted;
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145
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146 /* Load the sprite image */
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147 sprite = SDL_LoadBMP(file);
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148 if ( sprite == NULL ) {
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149 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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150 return(-1);
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151 }
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152
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153 /* Set transparent pixel as the pixel at (0,0) */
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154 if ( sprite->format->palette ) {
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155 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY,
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156 *(Uint8 *)sprite->pixels);
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157 }
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158
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159 /* Convert sprite to video format */
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160 converted = SDL_DisplayFormat(sprite);
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161 SDL_FreeSurface(sprite);
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162 if ( converted == NULL ) {
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163 fprintf(stderr, "Couldn't convert background: %s\n",
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164 SDL_GetError());
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165 return(-1);
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166 }
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167 sprite = converted;
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168
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169 /* Create the background */
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170 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8,
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171 0, 0, 0, 0);
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172 if ( backing == NULL ) {
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173 fprintf(stderr, "Couldn't create background: %s\n",
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174 SDL_GetError());
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175 SDL_FreeSurface(sprite);
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176 return(-1);
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177 }
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178
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179 /* Convert background to video format */
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180 converted = SDL_DisplayFormat(backing);
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181 SDL_FreeSurface(backing);
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182 if ( converted == NULL ) {
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183 fprintf(stderr, "Couldn't convert background: %s\n",
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184 SDL_GetError());
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185 SDL_FreeSurface(sprite);
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186 return(-1);
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187 }
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188 backing = converted;
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189
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190 /* Set the initial position of the sprite */
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191 position.x = (screen->w-sprite->w)/2;
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192 position.y = (screen->h-sprite->h)/2;
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193 position.w = sprite->w;
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194 position.h = sprite->h;
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195 x_vel = 0; y_vel = 0;
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196 alpha_vel = 1;
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197
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198 /* We're ready to roll. :) */
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199 return(0);
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200 }
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201
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202 void AttractSprite(Uint16 x, Uint16 y)
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203 {
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204 x_vel = ((int)x-position.x)/10;
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205 y_vel = ((int)y-position.y)/10;
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206 }
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207
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208 void MoveSprite(SDL_Surface *screen, SDL_Surface *light)
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209 {
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210 SDL_Rect updates[2];
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211 int alpha;
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212
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213 /* Erase the sprite if it was visible */
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214 if ( sprite_visible ) {
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215 updates[0] = position;
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216 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
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217 } else {
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218 updates[0].x = 0; updates[0].y = 0;
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219 updates[0].w = 0; updates[0].h = 0;
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220 sprite_visible = 1;
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221 }
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222
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223 /* Since the sprite is off the screen, we can do other drawing
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224 without being overwritten by the saved area behind the sprite.
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225 */
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226 if ( light != NULL ) {
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227 int x, y;
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228
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229 SDL_GetMouseState(&x, &y);
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230 FlashLight(screen, light, x, y);
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parents:
diff changeset
231 }
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diff changeset
232
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233 /* Move the sprite, bounce at the wall */
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234 position.x += x_vel;
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235 if ( (position.x < 0) || (position.x >= screen->w) ) {
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236 x_vel = -x_vel;
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diff changeset
237 position.x += x_vel;
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parents:
diff changeset
238 }
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239 position.y += y_vel;
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240 if ( (position.y < 0) || (position.y >= screen->h) ) {
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241 y_vel = -y_vel;
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diff changeset
242 position.y += y_vel;
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parents:
diff changeset
243 }
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diff changeset
244
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diff changeset
245 /* Update transparency (fade in and out) */
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diff changeset
246 alpha = sprite->format->alpha;
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diff changeset
247 if ( (alpha+alpha_vel) < 0 ) {
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248 alpha_vel = -alpha_vel;
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diff changeset
249 } else
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250 if ( (alpha+alpha_vel) > 255 ) {
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251 alpha_vel = -alpha_vel;
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parents:
diff changeset
252 }
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253 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel));
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254
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255 /* Save the area behind the sprite */
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diff changeset
256 updates[1] = position;
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257 SDL_BlitSurface(screen, &updates[1], backing, NULL);
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diff changeset
258
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diff changeset
259 /* Blit the sprite onto the screen */
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diff changeset
260 updates[1] = position;
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diff changeset
261 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
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diff changeset
262
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parents:
diff changeset
263 /* Make it so! */
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parents:
diff changeset
264 SDL_UpdateRects(screen, 2, updates);
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parents:
diff changeset
265 }
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diff changeset
266
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diff changeset
267 void WarpSprite(SDL_Surface *screen, int x, int y)
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parents:
diff changeset
268 {
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diff changeset
269 SDL_Rect updates[2];
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diff changeset
270
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parents:
diff changeset
271 /* Erase, move, Draw, update */
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parents:
diff changeset
272 updates[0] = position;
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273 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
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diff changeset
274 position.x = x-sprite->w/2; /* Center about X */
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diff changeset
275 position.y = y-sprite->h/2; /* Center about Y */
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parents:
diff changeset
276 updates[1] = position;
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parents:
diff changeset
277 SDL_BlitSurface(screen, &updates[1], backing, NULL);
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diff changeset
278 updates[1] = position;
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diff changeset
279 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
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diff changeset
280 SDL_UpdateRects(screen, 2, updates);
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parents:
diff changeset
281 }
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diff changeset
282
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diff changeset
283 int main(int argc, char *argv[])
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parents:
diff changeset
284 {
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diff changeset
285 const SDL_VideoInfo *info;
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diff changeset
286 SDL_Surface *screen;
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parents:
diff changeset
287 Uint8 video_bpp;
74212992fb08 Initial revision
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parents:
diff changeset
288 Uint32 videoflags;
74212992fb08 Initial revision
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parents:
diff changeset
289 Uint8 *buffer;
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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parents: 0
diff changeset
290 int i, k, done;
0
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parents:
diff changeset
291 SDL_Event event;
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parents:
diff changeset
292 SDL_Surface *light;
74212992fb08 Initial revision
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parents:
diff changeset
293 int mouse_pressed;
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parents:
diff changeset
294 Uint32 ticks, lastticks;
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
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parents: 0
diff changeset
295 Uint16 *buffer16;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
296 Uint16 color;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
297 Uint8 gradient;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
298
0
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parents:
diff changeset
299
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parents:
diff changeset
300 /* Initialize SDL */
74212992fb08 Initial revision
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parents:
diff changeset
301 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
302 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
303 return(1);
0
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parents:
diff changeset
304 }
74212992fb08 Initial revision
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parents:
diff changeset
305
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parents:
diff changeset
306 /* Alpha blending doesn't work well at 8-bit color */
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parents:
diff changeset
307 info = SDL_GetVideoInfo();
74212992fb08 Initial revision
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parents:
diff changeset
308 if ( info->vfmt->BitsPerPixel > 8 ) {
74212992fb08 Initial revision
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parents:
diff changeset
309 video_bpp = info->vfmt->BitsPerPixel;
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parents:
diff changeset
310 } else {
74212992fb08 Initial revision
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parents:
diff changeset
311 video_bpp = 16;
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
312 fprintf(stderr, "forced 16 bpp mode\n");
0
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parents:
diff changeset
313 }
74212992fb08 Initial revision
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parents:
diff changeset
314 videoflags = SDL_SWSURFACE;
74212992fb08 Initial revision
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parents:
diff changeset
315 while ( argc > 1 ) {
74212992fb08 Initial revision
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parents:
diff changeset
316 --argc;
74212992fb08 Initial revision
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parents:
diff changeset
317 if ( strcmp(argv[argc-1], "-bpp") == 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
318 video_bpp = atoi(argv[argc]);
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
319 if (video_bpp<=8) {
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
320 video_bpp=16;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
321 fprintf(stderr, "forced 16 bpp mode\n");
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
322 }
0
74212992fb08 Initial revision
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parents:
diff changeset
323 --argc;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 } else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325 if ( strcmp(argv[argc], "-hw") == 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
326 videoflags |= SDL_HWSURFACE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 } else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 if ( strcmp(argv[argc], "-warp") == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329 videoflags |= SDL_HWPALETTE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330 } else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 if ( strcmp(argv[argc], "-fullscreen") == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332 videoflags |= SDL_FULLSCREEN;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334 fprintf(stderr,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 "Usage: %s [-bpp N] [-warp] [-hw] [-fullscreen]\n",
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 argv[0]);
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
337 quit(1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
340
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
341 /* Set 640x480 video mode */
1152
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
342 #ifndef _WIN32_WCE
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
343 if ( (screen=SDL_SetVideoMode(640,480,video_bpp,videoflags)) == NULL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
344 fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
345 video_bpp, SDL_GetError());
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
346 quit(2);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
347 }
1152
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
348 #else
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
349 /* Pocket PC */
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
350 if ( (screen=SDL_SetVideoMode(240,320,video_bpp,SDL_FULLSCREEN)) == NULL ) {
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
351 fprintf(stderr, "Couldn't set 240x320x%d video mode: %s\n",
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
352 video_bpp, SDL_GetError());
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
353 quit(2);
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
354 }
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 1151
diff changeset
355 #endif
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
356 /* Set the surface pixels and refresh! */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
357 if ( SDL_LockSurface(screen) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
358 fprintf(stderr, "Couldn't lock the display surface: %s\n",
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
359 SDL_GetError());
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
360 quit(2);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
361 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
362 buffer=(Uint8 *)screen->pixels;
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
363 if (screen->format->BytesPerPixel!=2) {
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
364 for ( i=0; i<screen->h; ++i ) {
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
365 memset(buffer,(i*255)/screen->h, screen->pitch);
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
366 buffer += screen->pitch;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
367 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
368 }
691
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
369 else
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
370 {
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
371 for ( i=0; i<screen->h; ++i ) {
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
372 gradient=((i*255)/screen->h);
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
373 color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
374 buffer16=(Uint16*)buffer;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
375 for (k=0; k<screen->w; k++)
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
376 {
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
377 *(buffer16+k)=color;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
378 }
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
379 buffer += screen->pitch;
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
380 }
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
381 }
609543e2b3a1 Date: Fri, 15 Aug 2003 09:13:59 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 0
diff changeset
382
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
383 SDL_UnlockSurface(screen);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
384 SDL_UpdateRect(screen, 0, 0, 0, 0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 /* Create the light */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
387 light = CreateLight(screen, 82);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
388 if ( light == NULL ) {
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
389 quit(1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
390 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392 /* Load the sprite */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 if ( LoadSprite(screen, "icon.bmp") < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 SDL_FreeSurface(light);
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
395 quit(1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
397
886
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
398 /* Print out information about our surfaces */
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
399 printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel);
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
400 if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
401 printf("Screen is in video memory\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
402 } else {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
403 printf("Screen is in system memory\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
404 }
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
405 if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
406 printf("Screen has double-buffering enabled\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
407 }
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
408 if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
409 printf("Sprite is in video memory\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
410 } else {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
411 printf("Sprite is in system memory\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
412 }
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
413
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
414 /* Run a sample blit to trigger blit acceleration */
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
415 { SDL_Rect dst;
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
416 dst.x = 0;
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
417 dst.y = 0;
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
418 dst.w = sprite->w;
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
419 dst.h = sprite->h;
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
420 SDL_BlitSurface(sprite, NULL, screen, &dst);
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
421 SDL_FillRect(screen, &dst, 0);
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
422 }
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
423 if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
424 printf("Sprite blit uses hardware alpha acceleration\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
425 } else {
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
426 printf("Sprite blit dosn't uses hardware alpha acceleration\n");
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
427 }
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
428
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 /* Set a clipping rectangle to clip the outside edge of the screen */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 { SDL_Rect clip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 clip.x = 32;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 clip.y = 32;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 clip.w = screen->w-(2*32);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 clip.h = screen->h-(2*32);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 SDL_SetClipRect(screen, &clip);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 /* Wait for a keystroke */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 lastticks = SDL_GetTicks();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 done = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 mouse_pressed = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 while ( !done ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 /* Update the frame -- move the sprite */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 if ( mouse_pressed ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 MoveSprite(screen, light);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 mouse_pressed = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 MoveSprite(screen, NULL);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 /* Slow down the loop to 30 frames/second */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 ticks = SDL_GetTicks();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 if ( (ticks-lastticks) < FRAME_TICKS ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 #ifdef CHECK_SLEEP_GRANULARITY
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 SDL_Delay(FRAME_TICKS-(ticks-lastticks));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 #ifdef CHECK_SLEEP_GRANULARITY
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 lastticks = ticks;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 /* Check for events */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465 while ( SDL_PollEvent(&event) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 switch (event.type) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 /* Attract sprite while mouse is held down */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
468 case SDL_MOUSEMOTION:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
469 if (event.motion.state != 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 AttractSprite(event.motion.x,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
471 event.motion.y);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 mouse_pressed = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
473 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
475 case SDL_MOUSEBUTTONDOWN:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
476 if ( event.button.button == 1 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477 AttractSprite(event.button.x,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478 event.button.y);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 mouse_pressed = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
480 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 SDL_Rect area;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 area.x = event.button.x-16;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484 area.y = event.button.y-16;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 area.w = 32;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486 area.h = 32;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
487 SDL_FillRect(screen, &area, 0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
488 SDL_UpdateRects(screen,1,&area);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
490 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 case SDL_KEYDOWN:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 /* Any keypress quits the app... */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 case SDL_QUIT:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
494 done = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
499 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
500 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 SDL_FreeSurface(light);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502 SDL_FreeSurface(sprite);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 SDL_FreeSurface(backing);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
504
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 /* Print out some timing information */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 if ( flashes > 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 printf("%d alpha blits, ~%4.4f ms per blit\n",
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 flashes, (float)flashtime/flashes);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 }
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
510
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
511 SDL_Quit();
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
513 }