Mercurial > sdl-ios-xcode
annotate test/testgamma.c @ 5200:29df83fe4cd1
Fixed compiling the automated test
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 05 Feb 2011 13:06:50 -0800 |
parents | c121d94672cb |
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rev | line source |
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0 | 1 |
2 /* Bring up a window and manipulate the gamma on it */ | |
3 | |
4 #include <stdlib.h> | |
5 #include <stdio.h> | |
6 #include <string.h> | |
7 #include <math.h> | |
8 | |
9 #include "SDL.h" | |
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 |
0 | 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) |
0 | 22 { |
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23 int i, value; |
0 | 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 } |
0 | 33 } |
34 | |
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) |
0 | 38 { |
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39 int i; |
0 | 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; |
0 | 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; |
0 | 69 } |
70 | |
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71 int |
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72 main(int argc, char *argv[]) |
0 | 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; |
0 | 83 |
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84 /* Check command line arguments */ |
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85 argv += get_video_args(argv, &w, &h, &bpp, &flags); |
0 | 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 } |
0 | 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 } |
0 | 100 |
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101 /* Set the window manager title bar */ |
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102 SDL_WM_SetCaption("SDL gamma test", "testgamma"); |
0 | 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 } |
0 | 122 #endif |
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; |
0 | 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 } |
0 | 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; |
0 | 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 } |
0 | 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); |
0 | 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); |
0 | 191 |
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192 SDL_Quit(); |
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193 return (0); |
0 | 194 } |