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annotate test/testsprite.c @ 1724:6c63fc2bd986 SDL-1.3

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Proof of concept done - Win32 GDI implementation mostly complete.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 06 Jul 2006 07:17:11 +0000
parents 931d111e737a
children
rev   line source
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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 <stdlib.h>
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4 #include <time.h>
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5
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6 #include "SDL.h"
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7
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8 #define NUM_SPRITES 100
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9 #define MAX_SPEED 1
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10
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11 SDL_Surface *sprite;
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12 int numsprites;
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13 SDL_Rect *sprite_rects;
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14 SDL_Rect *positions;
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15 SDL_Rect *velocities;
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16 int sprites_visible;
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17 int debug_flip;
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18 Uint16 sprite_w, sprite_h;
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19
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20 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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21 static void
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22 quit(int rc)
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23 {
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24 SDL_Quit();
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25 exit(rc);
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26 }
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27
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28 int
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29 LoadSprite(char *file)
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30 {
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31 SDL_Surface *temp;
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32
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33 /* Load the sprite image */
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34 sprite = SDL_LoadBMP(file);
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35 if (sprite == NULL) {
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36 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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37 return (-1);
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38 }
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39
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40 /* Set transparent pixel as the pixel at (0,0) */
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41 if (sprite->format->palette) {
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42 SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY | SDL_RLEACCEL),
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43 *(Uint8 *) sprite->pixels);
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44 }
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45
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46 /* Convert sprite to video format */
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47 temp = SDL_DisplayFormat(sprite);
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48 SDL_FreeSurface(sprite);
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49 if (temp == NULL) {
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50 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
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51 return (-1);
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52 }
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53 sprite = temp;
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54
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55 /* We're ready to roll. :) */
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56 return (0);
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57 }
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58
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59 void
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60 MoveSprites(SDL_Surface * screen, Uint32 background)
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61 {
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62 int i, nupdates;
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63 SDL_Rect area, *position, *velocity;
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64
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65 nupdates = 0;
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66 /* Erase all the sprites if necessary */
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67 if (sprites_visible) {
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68 SDL_FillRect(screen, NULL, background);
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69 }
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70
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71 /* Move the sprite, bounce at the wall, and draw */
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72 for (i = 0; i < numsprites; ++i) {
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73 position = &positions[i];
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74 velocity = &velocities[i];
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75 position->x += velocity->x;
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76 if ((position->x < 0) || (position->x >= (screen->w - sprite_w))) {
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77 velocity->x = -velocity->x;
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78 position->x += velocity->x;
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79 }
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80 position->y += velocity->y;
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81 if ((position->y < 0) || (position->y >= (screen->h - sprite_w))) {
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82 velocity->y = -velocity->y;
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83 position->y += velocity->y;
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84 }
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85
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86 /* Blit the sprite onto the screen */
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87 area = *position;
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88 SDL_BlitSurface(sprite, NULL, screen, &area);
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89 sprite_rects[nupdates++] = area;
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90 }
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91
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92 if (debug_flip) {
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93 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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94 static int t = 0;
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95
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96 Uint32 color = SDL_MapRGB(screen->format, 255, 0, 0);
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97 SDL_Rect r;
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98 r.x =
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99 (sin((float) t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w - 20);
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100 r.y = 0;
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101 r.w = 20;
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102 r.h = screen->h;
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103
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104 SDL_FillRect(screen, &r, color);
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105 t += 2;
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106 }
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107 }
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108
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109 /* Update the screen! */
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110 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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111 SDL_Flip(screen);
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112 } else {
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113 SDL_UpdateRects(screen, nupdates, sprite_rects);
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114 }
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115 sprites_visible = 1;
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116 }
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117
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118 /* This is a way of telling whether or not to use hardware surfaces */
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119 Uint32
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120 FastestFlags(Uint32 flags, int width, int height, int bpp)
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121 {
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122 const SDL_VideoInfo *info;
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123
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124 /* Hardware acceleration is only used in fullscreen mode */
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125 flags |= SDL_FULLSCREEN;
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126
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127 /* Check for various video capabilities */
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128 info = SDL_GetVideoInfo();
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129 if (info->blit_hw_CC && info->blit_fill) {
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130 /* We use accelerated colorkeying and color filling */
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131 flags |= SDL_HWSURFACE;
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132 }
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133 /* If we have enough video memory, and will use accelerated
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134 blits directly to it, then use page flipping.
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135 */
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136 if ((flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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137 /* Direct hardware blitting without double-buffering
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138 causes really bad flickering.
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139 */
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140 if (info->video_mem * 1024 > (height * width * bpp / 8)) {
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141 flags |= SDL_DOUBLEBUF;
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142 } else {
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143 flags &= ~SDL_HWSURFACE;
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144 }
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145 }
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146
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147 /* Return the flags */
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148 return (flags);
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149 }
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150
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151 int
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152 main(int argc, char *argv[])
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153 {
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154 SDL_Surface *screen;
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155 Uint8 *mem;
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156 int width, height;
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157 Uint8 video_bpp;
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158 Uint32 videoflags;
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159 Uint32 background;
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160 int i, done;
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161 SDL_Event event;
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162 Uint32 then, now, frames;
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163
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164 /* Initialize SDL */
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165 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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166 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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167 return (1);
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168 }
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169
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170 numsprites = NUM_SPRITES;
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171 videoflags = SDL_SWSURFACE | SDL_ANYFORMAT;
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172 width = 640;
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173 height = 480;
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174 video_bpp = 8;
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175 debug_flip = 0;
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176 while (argc > 1) {
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177 --argc;
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178 if (strcmp(argv[argc - 1], "-width") == 0) {
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179 width = atoi(argv[argc]);
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180 --argc;
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181 } else if (strcmp(argv[argc - 1], "-height") == 0) {
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182 height = atoi(argv[argc]);
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183 --argc;
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184 } else if (strcmp(argv[argc - 1], "-bpp") == 0) {
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185 video_bpp = atoi(argv[argc]);
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186 videoflags &= ~SDL_ANYFORMAT;
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187 --argc;
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188 } else if (strcmp(argv[argc], "-fast") == 0) {
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189 videoflags = FastestFlags(videoflags, width, height, video_bpp);
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190 } else if (strcmp(argv[argc], "-hw") == 0) {
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191 videoflags ^= SDL_HWSURFACE;
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192 } else if (strcmp(argv[argc], "-flip") == 0) {
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193 videoflags ^= SDL_DOUBLEBUF;
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194 } else if (strcmp(argv[argc], "-debugflip") == 0) {
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195 debug_flip ^= 1;
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196 } else if (strcmp(argv[argc], "-fullscreen") == 0) {
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197 videoflags ^= SDL_FULLSCREEN;
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198 } else if (isdigit(argv[argc][0])) {
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199 numsprites = atoi(argv[argc]);
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200 } else {
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201 fprintf(stderr,
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202 "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n",
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203 argv[0]);
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204 quit(1);
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205 }
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206 }
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207
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208 /* Set video mode */
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209 screen = SDL_SetVideoMode(width, height, video_bpp, videoflags);
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210 if (!screen) {
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211 fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
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212 width, height, SDL_GetError());
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213 quit(2);
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214 }
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215
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216 /* Load the sprite */
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217 if (LoadSprite("icon.bmp") < 0) {
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218 quit(1);
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219 }
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220
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221 /* Allocate memory for the sprite info */
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222 mem = (Uint8 *) malloc(4 * sizeof(SDL_Rect) * numsprites);
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223 if (mem == NULL) {
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224 SDL_FreeSurface(sprite);
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225 fprintf(stderr, "Out of memory!\n");
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226 quit(2);
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227 }
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228 sprite_rects = (SDL_Rect *) mem;
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229 positions = sprite_rects;
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230 sprite_rects += numsprites;
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231 velocities = sprite_rects;
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232 sprite_rects += numsprites;
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233 sprite_w = sprite->w;
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234 sprite_h = sprite->h;
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235 srand(time(NULL));
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236 for (i = 0; i < numsprites; ++i) {
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237 positions[i].x = rand() % (screen->w - sprite_w);
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238 positions[i].y = rand() % (screen->h - sprite_h);
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239 positions[i].w = sprite->w;
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240 positions[i].h = sprite->h;
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241 velocities[i].x = 0;
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242 velocities[i].y = 0;
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243 while (!velocities[i].x && !velocities[i].y) {
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244 velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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245 velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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246 }
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247 }
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248 background = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
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249
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250 /* Print out information about our surfaces */
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251 printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
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252 if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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253 printf("Screen is in video memory\n");
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254 } else {
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255 printf("Screen is in system memory\n");
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256 }
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257 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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258 printf("Screen has double-buffering enabled\n");
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259 }
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260 if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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261 printf("Sprite is in video memory\n");
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262 } else {
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263 printf("Sprite is in system memory\n");
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264 }
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265 /* Run a sample blit to trigger blit acceleration */
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266 {
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267 SDL_Rect dst;
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268 dst.x = 0;
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269 dst.y = 0;
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270 dst.w = sprite->w;
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271 dst.h = sprite->h;
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272 SDL_BlitSurface(sprite, NULL, screen, &dst);
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273 SDL_FillRect(screen, &dst, background);
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274 }
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275 if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
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276 printf("Sprite blit uses hardware acceleration\n");
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277 }
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278 if ((sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
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279 printf("Sprite blit uses RLE acceleration\n");
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280 }
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281
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282 /* Loop, blitting sprites and waiting for a keystroke */
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283 frames = 0;
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284 then = SDL_GetTicks();
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285 done = 0;
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286 sprites_visible = 0;
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287 while (!done) {
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288 /* Check for events */
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289 ++frames;
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290 while (SDL_PollEvent(&event)) {
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291 switch (event.type) {
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292 case SDL_MOUSEBUTTONDOWN:
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293 SDL_WarpMouse(screen->w / 2, screen->h / 2);
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294 break;
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295 case SDL_KEYDOWN:
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296 /* Any keypress quits the app... */
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297 case SDL_QUIT:
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298 done = 1;
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299 break;
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300 default:
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301 break;
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302 }
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303 }
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304 MoveSprites(screen, background);
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305 }
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306 SDL_FreeSurface(sprite);
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307 free(mem);
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308
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309 /* Print out some timing information */
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310 now = SDL_GetTicks();
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311 if (now > then) {
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312 printf("%2.2f frames per second\n",
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313 ((double) frames * 1000) / (now - then));
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314 }
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315 SDL_Quit();
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316 return (0);
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317 }