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annotate test/testgamma.c @ 4639:f5cd4b6231ba

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Added Test Directory. Touch input works in touchSimp for wacom bamboo fun on Ubuntu linux. Not yet integrated into library. Should support other touch devices and other linux distros, but not tested on anything else.
author Jim Grandpre <jim.tla@gmail.com>
date Mon, 24 May 2010 23:44:24 -0400
parents c121d94672cb
children
rev   line source
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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diff changeset
164 default:
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diff changeset
165 break;
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166 }
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diff changeset
167 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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diff changeset
181 memset(red_ramp, 255, sizeof(red_ramp));
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182 memset(ramp, 0, sizeof(ramp));
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diff changeset
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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diff changeset
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 }