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annotate test/testspriteminimal.c @ 4495:dbbfdb9ea716

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Simplified clipboard API for sanity's sake. A complete clipboard implementation would support multiple formats that could be queried at runtime, events for when the clipboard contents changed, support for HTML, images, etc. We're not going that crazy, at least for now. :)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 07 Jul 2010 23:54:03 -0700
parents 64ce267332c6
children d2247eb39fab
rev   line source
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64a60c5d502e Automatically initialize the video system and create a renderer to simplify use.
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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_events.h"
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8 #include "SDL_video.h"
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9
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10 #define WINDOW_WIDTH 640
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11 #define WINDOW_HEIGHT 480
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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 static SDL_Texture *sprite;
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16 static SDL_Rect positions[NUM_SPRITES];
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17 static SDL_Rect velocities[NUM_SPRITES];
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18 static int 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 exit(rc);
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25 }
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26
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27 int
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28 LoadSprite(char *file)
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29 {
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30 SDL_Surface *temp;
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31
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32 /* Load the sprite image */
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33 temp = SDL_LoadBMP(file);
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34 if (temp == NULL) {
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35 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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36 return (-1);
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37 }
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38 sprite_w = temp->w;
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39 sprite_h = temp->h;
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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 (temp->format->palette) {
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43 SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *) temp->pixels);
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44 } else {
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45 switch (temp->format->BitsPerPixel) {
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46 case 15:
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47 SDL_SetColorKey(temp, SDL_TRUE,
64a60c5d502e Automatically initialize the video system and create a renderer to simplify use.
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48 (*(Uint16 *) temp->pixels) & 0x00007FFF);
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49 break;
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50 case 16:
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51 SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);
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52 break;
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53 case 24:
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54 SDL_SetColorKey(temp, SDL_TRUE,
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55 (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
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56 break;
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57 case 32:
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58 SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);
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59 break;
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60 }
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61 }
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62
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63 /* Create textures from the image */
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64 sprite = SDL_CreateTextureFromSurface(0, temp);
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65 if (!sprite) {
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66 SDL_SetColorKey(temp, 0, 0);
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67 sprite = SDL_CreateTextureFromSurface(0, temp);
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68 }
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69 if (!sprite) {
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70 fprintf(stderr, "Couldn't create texture: %s\n", SDL_GetError());
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71 SDL_FreeSurface(temp);
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72 return (-1);
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73 }
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74 SDL_FreeSurface(temp);
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75
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76 /* We're ready to roll. :) */
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77 return (0);
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78 }
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79
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80 void
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81 MoveSprites(SDL_Window * window, SDL_Texture * sprite)
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82 {
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83 int i;
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84 int window_w = WINDOW_WIDTH;
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85 int window_h = WINDOW_HEIGHT;
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86 SDL_Rect *position, *velocity;
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87
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88 /* Draw a gray background */
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89 SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
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90 SDL_RenderClear();
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91
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92 /* Move the sprite, bounce at the wall, and draw */
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93 for (i = 0; i < NUM_SPRITES; ++i) {
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94 position = &positions[i];
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95 velocity = &velocities[i];
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96 position->x += velocity->x;
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97 if ((position->x < 0) || (position->x >= (window_w - sprite_w))) {
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98 velocity->x = -velocity->x;
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99 position->x += velocity->x;
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100 }
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101 position->y += velocity->y;
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102 if ((position->y < 0) || (position->y >= (window_h - sprite_h))) {
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103 velocity->y = -velocity->y;
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104 position->y += velocity->y;
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105 }
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106
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107 /* Blit the sprite onto the screen */
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108 SDL_RenderCopy(sprite, NULL, position);
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109 }
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110
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111 /* Update the screen! */
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112 SDL_RenderPresent();
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113 }
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114
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115 int
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116 main(int argc, char *argv[])
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117 {
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118 SDL_Window *window;
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119 int i, done;
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120 SDL_Event event;
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121
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122 window = SDL_CreateWindow("Happy Smileys",
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123 SDL_WINDOWPOS_UNDEFINED,
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124 SDL_WINDOWPOS_UNDEFINED,
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125 WINDOW_WIDTH, WINDOW_HEIGHT,
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126 SDL_WINDOW_SHOWN);
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127 if (!window) {
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128 quit(2);
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129 }
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130
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131 if (LoadSprite("icon.bmp") < 0) {
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132 quit(2);
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133 }
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134
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135 /* Initialize the sprite positions */
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136 srand(time(NULL));
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137 for (i = 0; i < NUM_SPRITES; ++i) {
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138 positions[i].x = rand() % (WINDOW_WIDTH - sprite_w);
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139 positions[i].y = rand() % (WINDOW_HEIGHT - sprite_h);
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140 positions[i].w = sprite_w;
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141 positions[i].h = sprite_h;
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142 velocities[i].x = 0;
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143 velocities[i].y = 0;
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144 while (!velocities[i].x && !velocities[i].y) {
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145 velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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146 velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED;
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147 }
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148 }
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149
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150 /* Main render loop */
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151 done = 0;
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152 while (!done) {
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153 /* Check for events */
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154 while (SDL_PollEvent(&event)) {
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155 if (event.type == SDL_QUIT || event.type == SDL_KEYDOWN) {
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156 done = 1;
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157 }
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158 }
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159 MoveSprites(window, sprite);
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160 }
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161
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162 quit(0);
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163 }
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164
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165 /* vi: set ts=4 sw=4 expandtab: */