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annotate test/testalpha.c @ 1698:412149a1c756 SDL-1.3

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Renamed, per Mike's comment on bug #157
author Sam Lantinga <slouken@libsdl.org>
date Wed, 21 Jun 2006 08:25:17 +0000
parents 4da1ee79c9af
children
rev   line source
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1
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2 /* Simple program: Fill a colormap with gray and stripe it down the screen,
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3 Then move an alpha valued sprite around the screen.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <math.h>
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10
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11 #include "SDL.h"
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12
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13 #define FRAME_TICKS (1000/30) /* 30 frames/second */
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14
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15 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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16 static void
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17 quit(int rc)
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18 {
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19 SDL_Quit();
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20 exit(rc);
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21 }
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22
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23 /* Fill the screen with a gradient */
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24 static void
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25 FillBackground(SDL_Surface * screen)
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26 {
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27 Uint8 *buffer;
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28 Uint16 *buffer16;
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29 Uint16 color;
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30 Uint8 gradient;
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31 int i, k;
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32
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33 /* Set the surface pixels and refresh! */
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34 if (SDL_LockSurface(screen) < 0) {
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35 fprintf(stderr, "Couldn't lock the display surface: %s\n",
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36 SDL_GetError());
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37 quit(2);
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38 }
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39 buffer = (Uint8 *) screen->pixels;
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40 if (screen->format->BytesPerPixel != 2) {
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41 for (i = 0; i < screen->h; ++i) {
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42 memset(buffer, (i * 255) / screen->h,
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43 screen->w * screen->format->BytesPerPixel);
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44 buffer += screen->pitch;
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45 }
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46 } else {
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47 for (i = 0; i < screen->h; ++i) {
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48 gradient = ((i * 255) / screen->h);
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49 color =
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50 (Uint16) SDL_MapRGB(screen->format, gradient, gradient,
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51 gradient);
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52 buffer16 = (Uint16 *) buffer;
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53 for (k = 0; k < screen->w; k++) {
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54 *(buffer16 + k) = color;
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55 }
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56 buffer += screen->pitch;
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57 }
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58 }
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59
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60 SDL_UnlockSurface(screen);
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61 SDL_UpdateRect(screen, 0, 0, 0, 0);
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62 }
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63
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64 /* Create a "light" -- a yellowish surface with variable alpha */
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65 SDL_Surface *
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66 CreateLight(int radius)
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67 {
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68 Uint8 trans, alphamask;
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69 int range, addition;
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70 int xdist, ydist;
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71 Uint16 x, y;
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72 Uint16 skip;
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73 Uint32 pixel;
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74 SDL_Surface *light;
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75
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76 #ifdef LIGHT_16BIT
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77 Uint16 *buf;
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78
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79 /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
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80 /* Note: this isn't any faster than a 32 bit alpha surface */
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81 alphamask = 0x0000000F;
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82 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 16,
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83 0x0000F000, 0x00000F00, 0x000000F0,
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84 alphamask);
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85 #else
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86 Uint32 *buf;
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87
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88 /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
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89 alphamask = 0x000000FF;
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90 light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 32,
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91 0xFF000000, 0x00FF0000, 0x0000FF00,
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92 alphamask);
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93 if (light == NULL) {
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94 fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError());
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95 return (NULL);
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96 }
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97 #endif
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98
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99 /* Fill with a light yellow-orange color */
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100 skip = light->pitch - (light->w * light->format->BytesPerPixel);
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101 #ifdef LIGHT_16BIT
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102 buf = (Uint16 *) light->pixels;
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103 #else
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104 buf = (Uint32 *) light->pixels;
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105 #endif
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106 /* Get a tranparent pixel value - we'll add alpha later */
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107 pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0);
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108 for (y = 0; y < light->h; ++y) {
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109 for (x = 0; x < light->w; ++x) {
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110 *buf++ = pixel;
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111 }
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112 buf += skip; /* Almost always 0, but just in case... */
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113 }
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114
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115 /* Calculate alpha values for the surface. */
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116 #ifdef LIGHT_16BIT
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117 buf = (Uint16 *) light->pixels;
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118 #else
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119 buf = (Uint32 *) light->pixels;
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120 #endif
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121 for (y = 0; y < light->h; ++y) {
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122 for (x = 0; x < light->w; ++x) {
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123 /* Slow distance formula (from center of light) */
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124 xdist = x - (light->w / 2);
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125 ydist = y - (light->h / 2);
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126 range = (int) sqrt(xdist * xdist + ydist * ydist);
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127
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128 /* Scale distance to range of transparency (0-255) */
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129 if (range > radius) {
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130 trans = alphamask;
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131 } else {
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132 /* Increasing transparency with distance */
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133 trans = (Uint8) ((range * alphamask) / radius);
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134
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135 /* Lights are very transparent */
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136 addition = (alphamask + 1) / 8;
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137 if ((int) trans + addition > alphamask) {
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138 trans = alphamask;
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139 } else {
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140 trans += addition;
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141 }
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142 }
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143 /* We set the alpha component as the right N bits */
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144 *buf++ |= (255 - trans);
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145 }
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146 buf += skip; /* Almost always 0, but just in case... */
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147 }
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148 /* Enable RLE acceleration of this alpha surface */
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149 SDL_SetAlpha(light, SDL_SRCALPHA | SDL_RLEACCEL, 0);
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150
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151 /* We're done! */
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152 return (light);
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153 }
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154
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155 static Uint32 flashes = 0;
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156 static Uint32 flashtime = 0;
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157
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158 void
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159 FlashLight(SDL_Surface * screen, SDL_Surface * light, int x, int y)
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160 {
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161 SDL_Rect position;
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162 Uint32 ticks1;
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163 Uint32 ticks2;
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164
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165 /* Easy, center light */
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166 position.x = x - (light->w / 2);
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167 position.y = y - (light->h / 2);
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168 position.w = light->w;
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169 position.h = light->h;
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170 ticks1 = SDL_GetTicks();
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171 SDL_BlitSurface(light, NULL, screen, &position);
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172 ticks2 = SDL_GetTicks();
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173 SDL_UpdateRects(screen, 1, &position);
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174 ++flashes;
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175
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176 /* Update time spend doing alpha blitting */
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177 flashtime += (ticks2 - ticks1);
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178 }
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179
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180 static int sprite_visible = 0;
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181 static SDL_Surface *sprite;
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182 static SDL_Surface *backing;
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183 static SDL_Rect position;
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184 static int x_vel, y_vel;
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185 static int alpha_vel;
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186
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187 int
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188 LoadSprite(SDL_Surface * screen, char *file)
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189 {
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190 SDL_Surface *converted;
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191
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192 /* Load the sprite image */
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193 sprite = SDL_LoadBMP(file);
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194 if (sprite == NULL) {
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195 fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
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196 return (-1);
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197 }
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198
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199 /* Set transparent pixel as the pixel at (0,0) */
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200 if (sprite->format->palette) {
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201 SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, *(Uint8 *) sprite->pixels);
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202 }
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203
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204 /* Convert sprite to video format */
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205 converted = SDL_DisplayFormat(sprite);
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206 SDL_FreeSurface(sprite);
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207 if (converted == NULL) {
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208 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
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209 return (-1);
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210 }
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211 sprite = converted;
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212
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213 /* Create the background */
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214 backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8,
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215 0, 0, 0, 0);
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216 if (backing == NULL) {
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217 fprintf(stderr, "Couldn't create background: %s\n", SDL_GetError());
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218 SDL_FreeSurface(sprite);
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219 return (-1);
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220 }
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221
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222 /* Convert background to video format */
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223 converted = SDL_DisplayFormat(backing);
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224 SDL_FreeSurface(backing);
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225 if (converted == NULL) {
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226 fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
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227 SDL_FreeSurface(sprite);
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228 return (-1);
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229 }
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230 backing = converted;
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231
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232 /* Set the initial position of the sprite */
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233 position.x = (screen->w - sprite->w) / 2;
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234 position.y = (screen->h - sprite->h) / 2;
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235 position.w = sprite->w;
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236 position.h = sprite->h;
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237 x_vel = 0;
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238 y_vel = 0;
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239 alpha_vel = 1;
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240
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241 /* We're ready to roll. :) */
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242 return (0);
0
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243 }
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244
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245 void
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246 AttractSprite(Uint16 x, Uint16 y)
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247 {
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248 x_vel = ((int) x - position.x) / 10;
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249 y_vel = ((int) y - position.y) / 10;
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250 }
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251
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252 void
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253 MoveSprite(SDL_Surface * screen, SDL_Surface * light)
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254 {
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255 SDL_Rect updates[2];
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256 int alpha;
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257
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258 /* Erase the sprite if it was visible */
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259 if (sprite_visible) {
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260 updates[0] = position;
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261 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
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262 } else {
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263 updates[0].x = 0;
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264 updates[0].y = 0;
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265 updates[0].w = 0;
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266 updates[0].h = 0;
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267 sprite_visible = 1;
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268 }
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269
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270 /* Since the sprite is off the screen, we can do other drawing
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271 without being overwritten by the saved area behind the sprite.
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272 */
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273 if (light != NULL) {
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274 int x, y;
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275
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276 SDL_GetMouseState(&x, &y);
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277 FlashLight(screen, light, x, y);
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278 }
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279
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280 /* Move the sprite, bounce at the wall */
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281 position.x += x_vel;
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282 if ((position.x < 0) || (position.x >= screen->w)) {
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283 x_vel = -x_vel;
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284 position.x += x_vel;
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285 }
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286 position.y += y_vel;
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287 if ((position.y < 0) || (position.y >= screen->h)) {
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288 y_vel = -y_vel;
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289 position.y += y_vel;
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290 }
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291
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292 /* Update transparency (fade in and out) */
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293 alpha = sprite->format->alpha;
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294 if ((alpha + alpha_vel) < 0) {
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295 alpha_vel = -alpha_vel;
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296 } else if ((alpha + alpha_vel) > 255) {
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297 alpha_vel = -alpha_vel;
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298 }
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299 SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8) (alpha + alpha_vel));
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300
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301 /* Save the area behind the sprite */
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302 updates[1] = position;
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303 SDL_BlitSurface(screen, &updates[1], backing, NULL);
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304
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305 /* Blit the sprite onto the screen */
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306 updates[1] = position;
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307 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
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308
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309 /* Make it so! */
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310 SDL_UpdateRects(screen, 2, updates);
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311 }
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312
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313 void
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314 WarpSprite(SDL_Surface * screen, int x, int y)
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315 {
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316 SDL_Rect updates[2];
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317
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318 /* Erase, move, Draw, update */
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319 updates[0] = position;
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320 SDL_BlitSurface(backing, NULL, screen, &updates[0]);
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321 position.x = x - sprite->w / 2; /* Center about X */
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322 position.y = y - sprite->h / 2; /* Center about Y */
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323 updates[1] = position;
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324 SDL_BlitSurface(screen, &updates[1], backing, NULL);
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325 updates[1] = position;
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326 SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
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327 SDL_UpdateRects(screen, 2, updates);
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328 }
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329
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330 int
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331 main(int argc, char *argv[])
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332 {
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333 const SDL_VideoInfo *info;
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334 SDL_Surface *screen;
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335 int w, h;
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336 Uint8 video_bpp;
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337 Uint32 videoflags;
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338 int i, done;
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339 SDL_Event event;
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340 SDL_Surface *light;
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341 int mouse_pressed;
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342 Uint32 ticks, lastticks;
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343
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344
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345 /* Initialize SDL */
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346 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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347 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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348 return (1);
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349 }
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350
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351 /* Alpha blending doesn't work well at 8-bit color */
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352 #ifdef _WIN32_WCE
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353 /* Pocket PC */
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354 w = 240;
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355 h = 320;
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356 #else
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357 w = 640;
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358 h = 480;
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359 #endif
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360 info = SDL_GetVideoInfo();
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361 if (info->vfmt->BitsPerPixel > 8) {
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362 video_bpp = info->vfmt->BitsPerPixel;
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363 } else {
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364 video_bpp = 16;
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365 fprintf(stderr, "forced 16 bpp mode\n");
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366 }
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367 videoflags = SDL_SWSURFACE;
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368 for (i = 1; argv[i]; ++i) {
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369 if (strcmp(argv[i], "-bpp") == 0) {
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370 video_bpp = atoi(argv[++i]);
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371 if (video_bpp <= 8) {
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372 video_bpp = 16;
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373 fprintf(stderr, "forced 16 bpp mode\n");
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374 }
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375 } else if (strcmp(argv[i], "-hw") == 0) {
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376 videoflags |= SDL_HWSURFACE;
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377 } else if (strcmp(argv[i], "-warp") == 0) {
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378 videoflags |= SDL_HWPALETTE;
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379 } else if (strcmp(argv[i], "-width") == 0 && argv[i + 1]) {
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parents: 1662
diff changeset
380 w = atoi(argv[++i]);
4da1ee79c9af more tweaking indent options
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parents: 1662
diff changeset
381 } else if (strcmp(argv[i], "-height") == 0 && argv[i + 1]) {
4da1ee79c9af more tweaking indent options
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parents: 1662
diff changeset
382 h = atoi(argv[++i]);
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parents: 1662
diff changeset
383 } else if (strcmp(argv[i], "-resize") == 0) {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
384 videoflags |= SDL_RESIZABLE;
1668
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diff changeset
385 } else if (strcmp(argv[i], "-noframe") == 0) {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
386 videoflags |= SDL_NOFRAME;
1668
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parents: 1662
diff changeset
387 } else if (strcmp(argv[i], "-fullscreen") == 0) {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
388 videoflags |= SDL_FULLSCREEN;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1659
diff changeset
389 } else {
1668
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parents: 1662
diff changeset
390 fprintf(stderr,
4da1ee79c9af more tweaking indent options
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parents: 1662
diff changeset
391 "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
392 argv[0]);
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parents: 1662
diff changeset
393 quit(1);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
394 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
395 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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parents: 1659
diff changeset
397 /* Set video mode */
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
398 if ((screen = SDL_SetVideoMode(w, h, video_bpp, videoflags)) == NULL) {
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
399 fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
400 w, h, video_bpp, SDL_GetError());
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parents: 1662
diff changeset
401 quit(2);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
402 }
1668
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parents: 1662
diff changeset
403 FillBackground(screen);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
405 /* Create the light */
1668
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parents: 1662
diff changeset
406 light = CreateLight(82);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
407 if (light == NULL) {
1668
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parents: 1662
diff changeset
408 quit(1);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
409 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
410
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
411 /* Load the sprite */
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
412 if (LoadSprite(screen, "icon.bmp") < 0) {
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
413 SDL_FreeSurface(light);
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
414 quit(1);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
415 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
417 /* Print out information about our surfaces */
1668
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parents: 1662
diff changeset
418 printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
419 if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
420 printf("Screen is in video memory\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
421 } else {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
422 printf("Screen is in system memory\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
423 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
424 if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
1668
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parents: 1662
diff changeset
425 printf("Screen has double-buffering enabled\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
426 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
427 if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
428 printf("Sprite is in video memory\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
429 } else {
1668
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parents: 1662
diff changeset
430 printf("Sprite is in system memory\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
431 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
433 /* Run a sample blit to trigger blit acceleration */
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
434 MoveSprite(screen, NULL);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
435 if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
1668
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parents: 1662
diff changeset
436 printf("Sprite blit uses hardware alpha acceleration\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
437 } else {
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
438 printf("Sprite blit dosn't uses hardware alpha acceleration\n");
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
439 }
886
05c551e5bc64 Date: Sat, 24 Apr 2004 15:13:32 +0300
Sam Lantinga <slouken@libsdl.org>
parents: 691
diff changeset
440
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
441 /* Set a clipping rectangle to clip the outside edge of the screen */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
442 {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
443 SDL_Rect clip;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
444 clip.x = 32;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
445 clip.y = 32;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
446 clip.w = screen->w - (2 * 32);
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
447 clip.h = screen->h - (2 * 32);
1668
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diff changeset
448 SDL_SetClipRect(screen, &clip);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
449 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
451 /* Wait for a keystroke */
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
452 lastticks = SDL_GetTicks();
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
453 done = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
454 mouse_pressed = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
455 while (!done) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
456 /* Update the frame -- move the sprite */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
457 if (mouse_pressed) {
1668
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parents: 1662
diff changeset
458 MoveSprite(screen, light);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
459 mouse_pressed = 0;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
460 } else {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
461 MoveSprite(screen, NULL);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
462 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
464 /* Slow down the loop to 30 frames/second */
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
465 ticks = SDL_GetTicks();
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
466 if ((ticks - lastticks) < FRAME_TICKS) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
467 #ifdef CHECK_SLEEP_GRANULARITY
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
468 fprintf(stderr, "Sleeping %d ticks\n",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
469 FRAME_TICKS - (ticks - lastticks));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
470 #endif
1668
4da1ee79c9af more tweaking indent options
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parents: 1662
diff changeset
471 SDL_Delay(FRAME_TICKS - (ticks - lastticks));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
472 #ifdef CHECK_SLEEP_GRANULARITY
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
473 fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks() - ticks));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
474 #endif
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
475 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
476 lastticks = ticks;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
477
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
478 /* Check for events */
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
479 while (SDL_PollEvent(&event)) {
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
480 switch (event.type) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
481 case SDL_VIDEORESIZE:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
482 screen =
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
483 SDL_SetVideoMode(event.resize.w, event.resize.h,
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
484 video_bpp, videoflags);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
485 if (screen) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
486 FillBackground(screen);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
487 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
488 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
489 /* Attract sprite while mouse is held down */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
490 case SDL_MOUSEMOTION:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
491 if (event.motion.state != 0) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
492 AttractSprite(event.motion.x, event.motion.y);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
493 mouse_pressed = 1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
494 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
495 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
496 case SDL_MOUSEBUTTONDOWN:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
497 if (event.button.button == 1) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
498 AttractSprite(event.button.x, event.button.y);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
499 mouse_pressed = 1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
500 } else {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
501 SDL_Rect area;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
502
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
503 area.x = event.button.x - 16;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
504 area.y = event.button.y - 16;
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Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
505 area.w = 32;
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Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
506 area.h = 32;
1668
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
507 SDL_FillRect(screen, &area, 0);
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
508 SDL_UpdateRects(screen, 1, &area);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
509 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
510 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
511 case SDL_KEYDOWN:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
512 if (event.key.keysym.sym == SDLK_ESCAPE) {
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
513 done = 1;
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Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
514 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
515 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
516 case SDL_QUIT:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
517 done = 1;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
518 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
519 default:
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
520 break;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
521 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
522 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
523 }
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
524 SDL_FreeSurface(light);
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
525 SDL_FreeSurface(sprite);
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Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
526 SDL_FreeSurface(backing);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
528 /* Print out some timing information */
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
529 if (flashes > 0) {
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
530 printf("%d alpha blits, ~%4.4f ms per blit\n",
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
531 flashes, (float) flashtime / flashes);
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
532 }
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 886
diff changeset
533
1668
4da1ee79c9af more tweaking indent options
Sam Lantinga <slouken@libsdl.org>
parents: 1662
diff changeset
534 SDL_Quit();
1662
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1659
diff changeset
535 return (0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
536 }