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annotate test/testsprite.c @ 1907:06c27a737b7a

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Streamlined the API a bit and optimized the software renderer.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 15 Jul 2006 09:46:36 +0000
parents c121d94672cb
children 103c6fec2a60
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 <stdio.h>
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5 #include <time.h>
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6
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7 #include "SDL.h"
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8
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9 #define NUM_SPRITES 100
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10 #define MAX_SPEED 1
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11
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12 SDL_Surface *sprite;
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13 int numsprites;
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14 SDL_Rect *sprite_rects;
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15 SDL_Rect *positions;
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16 SDL_Rect *velocities;
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17 int sprites_visible;
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18 int debug_flip;
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19 Uint16 sprite_w, sprite_h;
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20
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21 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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22 static void
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23 quit(int rc)
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24 {
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25 SDL_Quit();
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26 exit(rc);
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27 }
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28
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29 int
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30 LoadSprite(char *file)
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31 {
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32 SDL_Surface *temp;
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33
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34 /* Load the sprite image */
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35 sprite = SDL_LoadBMP(file);
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36 if (sprite == NULL) {
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37 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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38 return (-1);
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39 }
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40
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41 /* Set transparent pixel as the pixel at (0,0) */
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42 if (sprite->format->palette) {
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43 SDL_SetColorKey(sprite, (SDL_SRCCOLORKEY | SDL_RLEACCEL),
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44 *(Uint8 *) sprite->pixels);
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45 }
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46
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47 /* Convert sprite to video format */
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48 temp = SDL_DisplayFormat(sprite);
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49 SDL_FreeSurface(sprite);
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50 if (temp == NULL) {
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51 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
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52 return (-1);
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53 }
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54 sprite = temp;
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55
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56 /* We're ready to roll. :) */
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57 return (0);
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58 }
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59
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60 void
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61 MoveSprites(SDL_Surface * screen, Uint32 background)
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62 {
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63 int i, nupdates;
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64 SDL_Rect area, *position, *velocity;
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65
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66 nupdates = 0;
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67 /* Erase all the sprites if necessary */
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68 if (sprites_visible) {
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69 SDL_FillRect(screen, NULL, background);
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70 }
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71
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72 /* Move the sprite, bounce at the wall, and draw */
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73 for (i = 0; i < numsprites; ++i) {
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74 position = &positions[i];
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75 velocity = &velocities[i];
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76 position->x += velocity->x;
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77 if ((position->x < 0) || (position->x >= (screen->w - sprite_w))) {
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78 velocity->x = -velocity->x;
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79 position->x += velocity->x;
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80 }
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81 position->y += velocity->y;
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82 if ((position->y < 0) || (position->y >= (screen->h - sprite_w))) {
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83 velocity->y = -velocity->y;
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84 position->y += velocity->y;
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85 }
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86
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87 /* Blit the sprite onto the screen */
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88 area = *position;
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89 SDL_BlitSurface(sprite, NULL, screen, &area);
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90 sprite_rects[nupdates++] = area;
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91 }
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92
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93 if (debug_flip) {
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94 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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95 static int t = 0;
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96
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97 Uint32 color = SDL_MapRGB(screen->format, 255, 0, 0);
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98 SDL_Rect r;
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99 r.x =
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100 (sin((float) t * 2 * 3.1459) + 1.0) / 2.0 * (screen->w - 20);
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101 r.y = 0;
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102 r.w = 20;
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103 r.h = screen->h;
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104
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105 SDL_FillRect(screen, &r, color);
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106 t += 2;
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107 }
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108 }
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109
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110 /* Update the screen! */
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111 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
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112 SDL_Flip(screen);
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113 } else {
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114 SDL_UpdateRects(screen, nupdates, sprite_rects);
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115 }
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116 sprites_visible = 1;
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117 }
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118
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119 /* This is a way of telling whether or not to use hardware surfaces */
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120 Uint32
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121 FastestFlags(Uint32 flags, int width, int height, int bpp)
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122 {
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123 const SDL_VideoInfo *info;
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124
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125 /* Hardware acceleration is only used in fullscreen mode */
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126 flags |= SDL_FULLSCREEN;
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127
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128 /* Check for various video capabilities */
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129 info = SDL_GetVideoInfo();
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130 if (info->blit_hw_CC && info->blit_fill) {
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131 /* We use accelerated colorkeying and color filling */
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132 flags |= SDL_HWSURFACE;
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133 }
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134 /* If we have enough video memory, and will use accelerated
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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135 blits directly to it, then use page flipping.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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136 */
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137 if ((flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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138 /* Direct hardware blitting without double-buffering
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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139 causes really bad flickering.
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140 */
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141 if (info->video_mem * 1024 > (height * width * bpp / 8)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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142 flags |= SDL_DOUBLEBUF;
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143 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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144 flags &= ~SDL_HWSURFACE;
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145 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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146 }
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147
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148 /* Return the flags */
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149 return (flags);
0
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150 }
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151
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152 int
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153 main(int argc, char *argv[])
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154 {
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155 SDL_Surface *screen;
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156 Uint8 *mem;
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157 int width, height;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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158 Uint8 video_bpp;
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159 Uint32 videoflags;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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160 Uint32 background;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
161 int i, done;
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162 SDL_Event event;
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163 Uint32 then, now, frames;
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164
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165 /* Initialize SDL */
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166 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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167 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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168 return (1);
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169 }
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170
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171 numsprites = NUM_SPRITES;
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172 videoflags = SDL_SWSURFACE | SDL_ANYFORMAT;
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173 width = 640;
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174 height = 480;
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175 video_bpp = 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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176 debug_flip = 0;
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177 while (argc > 1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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178 --argc;
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179 if (strcmp(argv[argc - 1], "-width") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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180 width = atoi(argv[argc]);
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181 --argc;
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182 } else if (strcmp(argv[argc - 1], "-height") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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183 height = atoi(argv[argc]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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184 --argc;
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185 } else if (strcmp(argv[argc - 1], "-bpp") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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186 video_bpp = atoi(argv[argc]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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187 videoflags &= ~SDL_ANYFORMAT;
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188 --argc;
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189 } else if (strcmp(argv[argc], "-fast") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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190 videoflags = FastestFlags(videoflags, width, height, video_bpp);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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191 } else if (strcmp(argv[argc], "-hw") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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192 videoflags ^= SDL_HWSURFACE;
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193 } else if (strcmp(argv[argc], "-flip") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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194 videoflags ^= SDL_DOUBLEBUF;
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195 } else if (strcmp(argv[argc], "-debugflip") == 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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196 debug_flip ^= 1;
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197 } else if (strcmp(argv[argc], "-fullscreen") == 0) {
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198 videoflags ^= SDL_FULLSCREEN;
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199 } else if (isdigit(argv[argc][0])) {
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200 numsprites = atoi(argv[argc]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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201 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
202 fprintf(stderr,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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203 "Usage: %s [-bpp N] [-hw] [-flip] [-fast] [-fullscreen] [numsprites]\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
204 argv[0]);
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diff changeset
205 quit(1);
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206 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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207 }
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208
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209 /* Set video mode */
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210 screen = SDL_SetVideoMode(width, height, video_bpp, videoflags);
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211 if (!screen) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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212 fprintf(stderr, "Couldn't set %dx%d video mode: %s\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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213 width, height, SDL_GetError());
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214 quit(2);
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215 }
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216
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217 /* Load the sprite */
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218 if (LoadSprite("icon.bmp") < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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219 quit(1);
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220 }
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221
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222 /* Allocate memory for the sprite info */
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223 mem = (Uint8 *) malloc(4 * sizeof(SDL_Rect) * numsprites);
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224 if (mem == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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225 SDL_FreeSurface(sprite);
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226 fprintf(stderr, "Out of memory!\n");
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227 quit(2);
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228 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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229 sprite_rects = (SDL_Rect *) mem;
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230 positions = sprite_rects;
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231 sprite_rects += numsprites;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
232 velocities = sprite_rects;
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233 sprite_rects += numsprites;
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diff changeset
234 sprite_w = sprite->w;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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235 sprite_h = sprite->h;
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236 srand(time(NULL));
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diff changeset
237 for (i = 0; i < numsprites; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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238 positions[i].x = rand() % (screen->w - sprite_w);
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diff changeset
239 positions[i].y = rand() % (screen->h - sprite_h);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
240 positions[i].w = sprite->w;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
241 positions[i].h = sprite->h;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
242 velocities[i].x = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
243 velocities[i].y = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
244 while (!velocities[i].x && !velocities[i].y) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
246 velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
247 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
248 }
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diff changeset
249 background = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
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250
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diff changeset
251 /* Print out information about our surfaces */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
252 printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
253 if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
254 printf("Screen is in video memory\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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255 } else {
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256 printf("Screen is in system memory\n");
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257 }
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258 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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259 printf("Screen has double-buffering enabled\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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260 }
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261 if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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262 printf("Sprite is in video memory\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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263 } else {
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264 printf("Sprite is in system memory\n");
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265 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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266 /* Run a sample blit to trigger blit acceleration */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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267 {
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268 SDL_Rect dst;
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269 dst.x = 0;
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270 dst.y = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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271 dst.w = sprite->w;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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272 dst.h = sprite->h;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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273 SDL_BlitSurface(sprite, NULL, screen, &dst);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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274 SDL_FillRect(screen, &dst, background);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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275 }
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276 if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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277 printf("Sprite blit uses hardware acceleration\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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278 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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279 if ((sprite->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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280 printf("Sprite blit uses RLE acceleration\n");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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281 }
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282
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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283 /* Loop, blitting sprites and waiting for a keystroke */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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284 frames = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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285 then = SDL_GetTicks();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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286 done = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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287 sprites_visible = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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288 while (!done) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
289 /* Check for events */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 ++frames;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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291 while (SDL_PollEvent(&event)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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292 switch (event.type) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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293 case SDL_MOUSEBUTTONDOWN:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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294 SDL_WarpMouse(screen->w / 2, screen->h / 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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295 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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296 case SDL_KEYDOWN:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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297 /* Any keypress quits the app... */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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298 case SDL_QUIT:
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299 done = 1;
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300 break;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
301 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
302 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1516
diff changeset
303 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
304 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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305 MoveSprites(screen, background);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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306 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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307 SDL_FreeSurface(sprite);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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308 free(mem);
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309
1895
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310 /* Print out some timing information */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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311 now = SDL_GetTicks();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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312 if (now > then) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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313 printf("%2.2f frames per second\n",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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314 ((double) frames * 1000) / (now - then));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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315 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
316 SDL_Quit();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
317 return (0);
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74212992fb08 Initial revision
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diff changeset
318 }