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annotate test/testgamma.c @ 1666:6e7ec5cb83c3 SDL-1.3

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The dummy video driver compiles. :)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 21:56:07 +0000
parents 782fd950bd46
children 4da1ee79c9af
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0
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1
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2 /* Bring up a window and manipulate the gamma on it */
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3
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4 #include <stdlib.h>
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5 #include <stdio.h>
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6 #include <string.h>
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7 #include <math.h>
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8
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9 #include "SDL.h"
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10
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11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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12 static void
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13 quit (int rc)
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14 {
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15 SDL_Quit ();
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16 exit (rc);
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17 }
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18
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19 /* Turn a normal gamma value into an appropriate gamma ramp */
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20 void
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21 CalculateGamma (double gamma, Uint16 * ramp)
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22 {
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23 int i, value;
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24
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25 gamma = 1.0 / gamma;
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26 for (i = 0; i < 256; ++i) {
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27 value = (int) (pow ((double) i / 256.0, gamma) * 65535.0 + 0.5);
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28 if (value > 65535) {
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29 value = 65535;
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30 }
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31 ramp[i] = (Uint16) value;
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32 }
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33 }
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34
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35 /* This can be used as a general routine for all of the test programs */
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36 int
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37 get_video_args (char *argv[], int *w, int *h, int *bpp, Uint32 * flags)
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38 {
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39 int i;
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40
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41 *w = 640;
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42 *h = 480;
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43 *bpp = 0;
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44 *flags = SDL_SWSURFACE;
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45
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46 for (i = 1; argv[i]; ++i) {
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47 if (strcmp (argv[i], "-width") == 0) {
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48 if (argv[i + 1]) {
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49 *w = atoi (argv[++i]);
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50 }
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51 } else if (strcmp (argv[i], "-height") == 0) {
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52 if (argv[i + 1]) {
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53 *h = atoi (argv[++i]);
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54 }
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55 } else if (strcmp (argv[i], "-bpp") == 0) {
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56 if (argv[i + 1]) {
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57 *bpp = atoi (argv[++i]);
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58 }
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59 } else if (strcmp (argv[i], "-fullscreen") == 0) {
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60 *flags |= SDL_FULLSCREEN;
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61 } else if (strcmp (argv[i], "-hw") == 0) {
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62 *flags |= SDL_HWSURFACE;
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63 } else if (strcmp (argv[i], "-hwpalette") == 0) {
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64 *flags |= SDL_HWPALETTE;
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65 } else
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66 break;
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67 }
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68 return i;
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69 }
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70
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71 int
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72 main (int argc, char *argv[])
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73 {
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74 SDL_Surface *screen;
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75 SDL_Surface *image;
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76 float gamma;
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77 int i;
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78 int w, h, bpp;
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79 Uint32 flags;
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80 Uint16 ramp[256];
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81 Uint16 red_ramp[256];
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82 Uint32 then, timeout;
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83
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84 /* Check command line arguments */
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85 argv += get_video_args (argv, &w, &h, &bpp, &flags);
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86
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87 /* Initialize SDL */
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88 if (SDL_Init (SDL_INIT_VIDEO) < 0) {
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89 fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
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90 return (1);
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91 }
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92
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93 /* Initialize the display, always use hardware palette */
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94 screen = SDL_SetVideoMode (w, h, bpp, flags | SDL_HWPALETTE);
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95 if (screen == NULL) {
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96 fprintf (stderr, "Couldn't set %dx%d video mode: %s\n",
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97 w, h, SDL_GetError ());
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98 quit (1);
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99 }
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100
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101 /* Set the window manager title bar */
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102 SDL_WM_SetCaption ("SDL gamma test", "testgamma");
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103
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104 /* Set the desired gamma, if any */
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105 gamma = 1.0f;
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106 if (*argv) {
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107 gamma = (float) atof (*argv);
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108 }
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109 if (SDL_SetGamma (gamma, gamma, gamma) < 0) {
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110 fprintf (stderr, "Unable to set gamma: %s\n", SDL_GetError ());
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111 quit (1);
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112 }
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113 #if 0 /* This isn't supported. Integrating the gamma ramps isn't exact */
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114 /* See what gamma was actually set */
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115 float real[3];
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116 if (SDL_GetGamma (&real[0], &real[1], &real[2]) < 0) {
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117 printf ("Couldn't get gamma: %s\n", SDL_GetError ());
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118 } else {
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119 printf ("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n",
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120 real[0], real[1], real[2]);
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121 }
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122 #endif
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123
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124 /* Do all the drawing work */
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125 image = SDL_LoadBMP ("sample.bmp");
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126 if (image) {
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127 SDL_Rect dst;
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128
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129 dst.x = (screen->w - image->w) / 2;
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130 dst.y = (screen->h - image->h) / 2;
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131 dst.w = image->w;
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132 dst.h = image->h;
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133 SDL_BlitSurface (image, NULL, screen, &dst);
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134 SDL_UpdateRects (screen, 1, &dst);
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135 }
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136
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137 /* Wait a bit, handling events */
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138 then = SDL_GetTicks ();
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139 timeout = (5 * 1000);
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140 while ((SDL_GetTicks () - then) < timeout) {
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141 SDL_Event event;
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142
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143 while (SDL_PollEvent (&event)) {
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144 switch (event.type) {
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145 case SDL_QUIT: /* Quit now */
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146 timeout = 0;
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147 break;
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148 case SDL_KEYDOWN:
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149 switch (event.key.keysym.sym) {
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150 case SDLK_SPACE: /* Go longer.. */
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151 timeout += (5 * 1000);
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152 break;
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153 case SDLK_UP:
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154 gamma += 0.2f;
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155 SDL_SetGamma (gamma, gamma, gamma);
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156 break;
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157 case SDLK_DOWN:
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158 gamma -= 0.2f;
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159 SDL_SetGamma (gamma, gamma, gamma);
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160 break;
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161 case SDLK_ESCAPE:
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162 timeout = 0;
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163 break;
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164 default:
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165 break;
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166 }
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167 break;
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168 }
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169 }
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170 }
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171
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172 /* Perform a gamma flash to red using color ramps */
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173 while (gamma < 10.0) {
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174 /* Increase the red gamma and decrease everything else... */
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175 gamma += 0.1f;
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176 CalculateGamma (gamma, red_ramp);
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177 CalculateGamma (1.0 / gamma, ramp);
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178 SDL_SetGammaRamp (red_ramp, ramp, ramp);
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179 }
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180 /* Finish completely red */
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181 memset (red_ramp, 255, sizeof (red_ramp));
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182 memset (ramp, 0, sizeof (ramp));
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183 SDL_SetGammaRamp (red_ramp, ramp, ramp);
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184
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185 /* Now fade out to black */
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186 for (i = (red_ramp[0] >> 8); i >= 0; --i) {
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187 memset (red_ramp, i, sizeof (red_ramp));
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188 SDL_SetGammaRamp (red_ramp, NULL, NULL);
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189 }
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190 SDL_Delay (1 * 1000);
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191
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192 SDL_Quit ();
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193 return (0);
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194 }