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annotate test/testsprite.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 4d241ea8a1cd
children 6e7ec5cb83c3
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1 /* Simple program: Move N sprites around on the screen as fast as possible */
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2
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3 #include <stdio.h>
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4 #include <stdlib.h>
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5 #include <string.h>
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6 #include <ctype.h>
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7 #include <math.h>
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8 #include <time.h>
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9
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10 #include "SDL.h"
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11
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12 #define NUM_SPRITES 100
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13 #define MAX_SPEED 1
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14
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15 SDL_Surface *sprite;
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16 int numsprites;
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17 SDL_Rect *sprite_rects;
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18 SDL_Rect *positions;
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19 SDL_Rect *velocities;
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20 int sprites_visible;
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21 int debug_flip;
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22 Uint16 sprite_w, sprite_h;
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23
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24 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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25 static void
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26 quit (int rc)
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27 {
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28 SDL_Quit ();
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29 exit (rc);
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30 }
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31
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32 int
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33 LoadSprite (char *file)
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34 {
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35 SDL_Surface *temp;
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36
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37 /* Load the sprite image */
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38 sprite = SDL_LoadBMP (file);
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39 if (sprite == NULL) {
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40 fprintf (stderr, "Couldn't load %s: %s", file, SDL_GetError ());
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41 return (-1);
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42 }
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43
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44 /* Set transparent pixel as the pixel at (0,0) */
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45 if (sprite->format->palette) {
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46 SDL_SetColorKey (sprite, (SDL_SRCCOLORKEY | SDL_RLEACCEL),
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47 *(Uint8 *) sprite->pixels);
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48 }
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49
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50 /* Convert sprite to video format */
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51 temp = SDL_DisplayFormat (sprite);
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52 SDL_FreeSurface (sprite);
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53 if (temp == NULL) {
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54 fprintf (stderr, "Couldn't convert background: %s\n",
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55 SDL_GetError ());
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56 return (-1);
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57 }
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58 sprite = temp;
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59
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60 /* We're ready to roll. :) */
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61 return (0);
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62 }
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64 void
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65 MoveSprites (SDL_Surface * screen, Uint32 background)
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66 {
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67 int i, nupdates;
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68 SDL_Rect area, *position, *velocity;
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70 nupdates = 0;
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71 /* Erase all the sprites if necessary */
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72 if (sprites_visible) {
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73 SDL_FillRect (screen, NULL, background);
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74 }
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75
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76 /* Move the sprite, bounce at the wall, and draw */
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77 for (i = 0; i < numsprites; ++i) {
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78 position = &positions[i];
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79 velocity = &velocities[i];
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80 position->x += velocity->x;
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81 if ((position->x < 0) || (position->x >= (screen->w - sprite_w))) {
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82 velocity->x = -velocity->x;
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83 position->x += velocity->x;
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84 }
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85 position->y += velocity->y;
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86 if ((position->y < 0) || (position->y >= (screen->h - sprite_w))) {
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87 velocity->y = -velocity->y;
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88 position->y += velocity->y;
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89 }
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90
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91 /* Blit the sprite onto the screen */
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92 area = *position;
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93 SDL_BlitSurface (sprite, NULL, screen, &area);
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94 sprite_rects[nupdates++] = area;
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95 }
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96
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97 if (debug_flip) {
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98 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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99 static int t = 0;
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101 Uint32 color = SDL_MapRGB (screen->format, 255, 0, 0);
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102 SDL_Rect r;
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103 r.x =
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104 (sin ((float) t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w - 20);
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105 r.y = 0;
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106 r.w = 20;
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107 r.h = screen->h;
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108
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109 SDL_FillRect (screen, &r, color);
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110 t += 2;
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111 }
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112 }
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113
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114 /* Update the screen! */
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115 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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116 SDL_Flip (screen);
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117 } else {
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118 SDL_UpdateRects (screen, nupdates, sprite_rects);
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119 }
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120 sprites_visible = 1;
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121 }
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122
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123 /* This is a way of telling whether or not to use hardware surfaces */
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124 Uint32
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125 FastestFlags (Uint32 flags, int width, int height, int bpp)
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126 {
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127 const SDL_VideoInfo *info;
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128
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129 /* Hardware acceleration is only used in fullscreen mode */
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130 flags |= SDL_FULLSCREEN;
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131
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132 /* Check for various video capabilities */
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133 info = SDL_GetVideoInfo ();
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134 if (info->blit_hw_CC && info->blit_fill) {
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135 /* We use accelerated colorkeying and color filling */
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136 flags |= SDL_HWSURFACE;
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137 }
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138 /* If we have enough video memory, and will use accelerated
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139 blits directly to it, then use page flipping.
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140 */
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141 if ((flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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142 /* Direct hardware blitting without double-buffering
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143 causes really bad flickering.
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144 */
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145 if (info->video_mem * 1024 > (height * width * bpp / 8)) {
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146 flags |= SDL_DOUBLEBUF;
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147 } else {
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148 flags &= ~SDL_HWSURFACE;
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149 }
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150 }
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151
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152 /* Return the flags */
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153 return (flags);
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154 }
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155
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156 int
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157 main (int argc, char *argv[])
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158 {
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159 SDL_DisplayMode mode;
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160 SDL_Surface *screen;
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161 Uint8 *mem;
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162 int width, height;
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163 Uint8 video_bpp;
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164 Uint32 videoflags;
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165 Uint32 background;
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166 int i, done;
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167 SDL_Event event;
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168 Uint32 then, now, frames;
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169
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170 /* Initialize SDL */
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171 if (SDL_Init (SDL_INIT_VIDEO) < 0) {
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172 fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
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173 return (1);
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174 }
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175
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176 numsprites = NUM_SPRITES;
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177 videoflags = SDL_SWSURFACE | SDL_ANYFORMAT;
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178 width = 640;
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179 height = 480;
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180 video_bpp = 8;
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181 debug_flip = 0;
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182 while (argc > 1) {
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183 --argc;
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184 if (strcmp (argv[argc - 1], "-width") == 0) {
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185 width = atoi (argv[argc]);
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186 --argc;
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187 } else if (strcmp (argv[argc - 1], "-height") == 0) {
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188 height = atoi (argv[argc]);
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189 --argc;
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190 } else if (strcmp (argv[argc - 1], "-bpp") == 0) {
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191 video_bpp = atoi (argv[argc]);
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192 videoflags &= ~SDL_ANYFORMAT;
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193 --argc;
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194 } else if (strcmp (argv[argc], "-fast") == 0) {
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195 videoflags = FastestFlags (videoflags, width, height, video_bpp);
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196 } else if (strcmp (argv[argc], "-hw") == 0) {
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197 videoflags ^= SDL_HWSURFACE;
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198 } else if (strcmp (argv[argc], "-flip") == 0) {
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199 videoflags ^= SDL_DOUBLEBUF;
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200 } else if (strcmp (argv[argc], "-debugflip") == 0) {
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201 debug_flip ^= 1;
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202 } else if (strcmp (argv[argc], "-fullscreen") == 0) {
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203 videoflags ^= SDL_FULLSCREEN;
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204 } else if (isdigit (argv[argc][0])) {
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205 numsprites = atoi (argv[argc]);
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206 } else {
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207 fprintf (stderr,
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208 "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n",
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209 argv[0]);
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210 quit (1);
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211 }
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212 }
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213
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214 /* Set video mode */
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215 mode.format = 0; /* FIXME */
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216 mode.w = width;
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217 mode.h = height;
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218 mode.refresh_rate = 0;
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219 screen = SDL_SetDisplayMode (&mode, videoflags);
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220 if (!screen) {
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221 fprintf (stderr, "Couldn't set %dx%d video mode: %s\n",
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222 width, height, SDL_GetError ());
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223 quit (2);
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224 }
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225
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226 /* Load the sprite */
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227 if (LoadSprite ("icon.bmp") < 0) {
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228 quit (1);
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229 }
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230
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231 /* Allocate memory for the sprite info */
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232 mem = (Uint8 *) malloc (4 * sizeof (SDL_Rect) * numsprites);
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233 if (mem == NULL) {
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234 SDL_FreeSurface (sprite);
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235 fprintf (stderr, "Out of memory!\n");
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236 quit (2);
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237 }
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238 sprite_rects = (SDL_Rect *) mem;
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239 positions = sprite_rects;
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240 sprite_rects += numsprites;
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241 velocities = sprite_rects;
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242 sprite_rects += numsprites;
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243 sprite_w = sprite->w;
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244 sprite_h = sprite->h;
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245 srand (time (NULL));
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246 for (i = 0; i < numsprites; ++i) {
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247 positions[i].x = rand () % (screen->w - sprite_w);
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248 positions[i].y = rand () % (screen->h - sprite_h);
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249 positions[i].w = sprite->w;
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250 positions[i].h = sprite->h;
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251 velocities[i].x = 0;
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252 velocities[i].y = 0;
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253 while (!velocities[i].x && !velocities[i].y) {
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254 velocities[i].x = (rand () % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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255 velocities[i].y = (rand () % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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256 }
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257 }
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258 background = SDL_MapRGB (screen->format, 0x00, 0x00, 0x00);
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259
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260 /* Print out information about our surfaces */
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261 printf ("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
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262 if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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263 printf ("Screen is in video memory\n");
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264 } else {
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265 printf ("Screen is in system memory\n");
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266 }
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267 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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268 printf ("Screen has double-buffering enabled\n");
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269 }
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270 if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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271 printf ("Sprite is in video memory\n");
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272 } else {
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273 printf ("Sprite is in system memory\n");
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274 }
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275 /* Run a sample blit to trigger blit acceleration */
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276 {
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277 SDL_Rect dst;
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278 dst.x = 0;
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279 dst.y = 0;
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280 dst.w = sprite->w;
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281 dst.h = sprite->h;
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282 SDL_BlitSurface (sprite, NULL, screen, &dst);
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283 SDL_FillRect (screen, &dst, background);
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284 }
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285 if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
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286 printf ("Sprite blit uses hardware acceleration\n");
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287 }
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288 if ((sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
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289 printf ("Sprite blit uses RLE acceleration\n");
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290 }
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291
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292 /* Loop, blitting sprites and waiting for a keystroke */
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293 frames = 0;
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294 then = SDL_GetTicks ();
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295 done = 0;
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296 sprites_visible = 0;
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297 while (!done) {
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298 /* Check for events */
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299 ++frames;
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300 while (SDL_PollEvent (&event)) {
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301 switch (event.type) {
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302 case SDL_MOUSEBUTTONDOWN:
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303 SDL_WarpMouse (screen->w / 2, screen->h / 2);
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304 break;
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305 case SDL_KEYDOWN:
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306 /* Any keypress quits the app... */
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307 case SDL_QUIT:
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308 done = 1;
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309 break;
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310 default:
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311 break;
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312 }
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313 }
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314 MoveSprites (screen, background);
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315 }
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316 SDL_FreeSurface (sprite);
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317 free (mem);
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318
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319 /* Print out some timing information */
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320 now = SDL_GetTicks ();
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321 if (now > then) {
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322 printf ("%2.2f frames per second\n",
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323 ((double) frames * 1000) / (now - then));
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324 }
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325 SDL_Quit ();
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326 return (0);
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327 }