Mercurial > sdl-ios-xcode
annotate test/testgamma.c @ 1782:23fe15f88c03
(none)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 08 May 2006 06:23:11 +0000 |
parents | be9c9c8f6d53 |
children | 782fd950bd46 c121d94672cb |
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 | |
1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
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11 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ |
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
12 static void quit(int rc) |
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
13 { |
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
14 SDL_Quit(); |
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
15 exit(rc); |
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
16 } |
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
17 |
0 | 18 /* Turn a normal gamma value into an appropriate gamma ramp */ |
19 void CalculateGamma(double gamma, Uint16 *ramp) | |
20 { | |
21 int i, value; | |
22 | |
23 gamma = 1.0 / gamma; | |
24 for ( i=0; i<256; ++i ) { | |
25 value = (int)(pow((double)i/256.0, gamma)*65535.0 + 0.5); | |
26 if ( value > 65535 ) { | |
27 value = 65535; | |
28 } | |
29 ramp[i] = (Uint16)value; | |
30 } | |
31 } | |
32 | |
33 /* This can be used as a general routine for all of the test programs */ | |
34 int get_video_args(char *argv[], int *w, int *h, int *bpp, Uint32 *flags) | |
35 { | |
36 int i; | |
37 | |
38 *w = 640; | |
39 *h = 480; | |
40 *bpp = 0; | |
41 *flags = SDL_SWSURFACE; | |
42 | |
43 for ( i=1; argv[i]; ++i ) { | |
44 if ( strcmp(argv[i], "-width") == 0 ) { | |
45 if ( argv[i+1] ) { | |
46 *w = atoi(argv[++i]); | |
47 } | |
48 } else | |
49 if ( strcmp(argv[i], "-height") == 0 ) { | |
50 if ( argv[i+1] ) { | |
51 *h = atoi(argv[++i]); | |
52 } | |
53 } else | |
54 if ( strcmp(argv[i], "-bpp") == 0 ) { | |
55 if ( argv[i+1] ) { | |
56 *bpp = atoi(argv[++i]); | |
57 } | |
58 } else | |
59 if ( strcmp(argv[i], "-fullscreen") == 0 ) { | |
60 *flags |= SDL_FULLSCREEN; | |
61 } else | |
62 if ( strcmp(argv[i], "-hw") == 0 ) { | |
63 *flags |= SDL_HWSURFACE; | |
64 } else | |
65 if ( strcmp(argv[i], "-hwpalette") == 0 ) { | |
66 *flags |= SDL_HWPALETTE; | |
67 } else | |
68 break; | |
69 } | |
70 return i; | |
71 } | |
72 | |
73 int main(int argc, char *argv[]) | |
74 { | |
75 SDL_Surface *screen; | |
76 SDL_Surface *image; | |
77 float gamma; | |
78 int i; | |
79 int w, h, bpp; | |
80 Uint32 flags; | |
81 Uint16 ramp[256]; | |
82 Uint16 red_ramp[256]; | |
83 Uint32 then, timeout; | |
84 | |
85 /* Check command line arguments */ | |
86 argv += get_video_args(argv, &w, &h, &bpp, &flags); | |
87 | |
88 /* Initialize SDL */ | |
89 if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { | |
90 fprintf(stderr, | |
91 "Couldn't initialize SDL: %s\n", SDL_GetError()); | |
1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
92 return(1); |
0 | 93 } |
94 | |
95 /* Initialize the display, always use hardware palette */ | |
96 screen = SDL_SetVideoMode(w, h, bpp, flags | SDL_HWPALETTE); | |
97 if ( screen == NULL ) { | |
98 fprintf(stderr, "Couldn't set %dx%d video mode: %s\n", | |
99 w, h, SDL_GetError()); | |
1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
100 quit(1); |
0 | 101 } |
102 | |
103 /* Set the window manager title bar */ | |
104 SDL_WM_SetCaption("SDL gamma test", "testgamma"); | |
105 | |
106 /* Set the desired gamma, if any */ | |
107 gamma = 1.0f; | |
108 if ( *argv ) { | |
109 gamma = (float)atof(*argv); | |
110 } | |
111 if ( SDL_SetGamma(gamma, gamma, gamma) < 0 ) { | |
112 fprintf(stderr, "Unable to set gamma: %s\n", SDL_GetError()); | |
1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
113 quit(1); |
0 | 114 } |
115 | |
116 #if 0 /* This isn't supported. Integrating the gamma ramps isn't exact */ | |
117 /* See what gamma was actually set */ | |
118 float real[3]; | |
119 if ( SDL_GetGamma(&real[0], &real[1], &real[2]) < 0 ) { | |
120 printf("Couldn't get gamma: %s\n", SDL_GetError()); | |
121 } else { | |
122 printf("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n", | |
123 real[0], real[1], real[2]); | |
124 } | |
125 #endif | |
126 | |
127 /* Do all the drawing work */ | |
128 image = SDL_LoadBMP("sample.bmp"); | |
129 if ( image ) { | |
130 SDL_Rect dst; | |
131 | |
132 dst.x = (screen->w - image->w)/2; | |
133 dst.y = (screen->h - image->h)/2; | |
134 dst.w = image->w; | |
135 dst.h = image->h; | |
136 SDL_BlitSurface(image, NULL, screen, &dst); | |
137 SDL_UpdateRects(screen, 1, &dst); | |
138 } | |
139 | |
140 /* Wait a bit, handling events */ | |
141 then = SDL_GetTicks(); | |
142 timeout = (5*1000); | |
143 while ( (SDL_GetTicks()-then) < timeout ) { | |
144 SDL_Event event; | |
145 | |
146 while ( SDL_PollEvent(&event) ) { | |
147 switch (event.type) { | |
148 case SDL_QUIT: /* Quit now */ | |
149 timeout = 0; | |
150 break; | |
151 case SDL_KEYDOWN: | |
152 switch (event.key.keysym.sym) { | |
153 case SDLK_SPACE: /* Go longer.. */ | |
154 timeout += (5*1000); | |
155 break; | |
156 case SDLK_UP: | |
157 gamma += 0.2f; | |
158 SDL_SetGamma(gamma, gamma, gamma); | |
159 break; | |
160 case SDLK_DOWN: | |
161 gamma -= 0.2f; | |
162 SDL_SetGamma(gamma, gamma, gamma); | |
163 break; | |
164 case SDLK_ESCAPE: | |
165 timeout = 0; | |
166 break; | |
167 default: | |
168 break; | |
169 } | |
170 break; | |
171 } | |
172 } | |
173 } | |
174 | |
175 /* Perform a gamma flash to red using color ramps */ | |
176 while ( gamma < 10.0 ) { | |
177 /* Increase the red gamma and decrease everything else... */ | |
178 gamma += 0.1f; | |
179 CalculateGamma(gamma, red_ramp); | |
180 CalculateGamma(1.0/gamma, ramp); | |
181 SDL_SetGammaRamp(red_ramp, ramp, ramp); | |
182 } | |
183 /* Finish completely red */ | |
184 memset(red_ramp, 255, sizeof(red_ramp)); | |
185 memset(ramp, 0, sizeof(ramp)); | |
186 SDL_SetGammaRamp(red_ramp, ramp, ramp); | |
187 | |
188 /* Now fade out to black */ | |
189 for ( i=(red_ramp[0] >> 8); i >= 0; --i ) { | |
190 memset(red_ramp, i, sizeof(red_ramp)); | |
191 SDL_SetGammaRamp(red_ramp, NULL, NULL); | |
192 } | |
193 SDL_Delay(1*1000); | |
194 | |
1151
be9c9c8f6d53
Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents:
0
diff
changeset
|
195 SDL_Quit(); |
0 | 196 return(0); |
197 } |