Mercurial > sdl-ios-xcode
annotate test/testgamma.c @ 1257:448a9a64537b
[PATCH] SDL_GetVideoMode() does not find best mode, part 2
Following commit 1.51, I come accross a problem when SDL must choose between
several video modes that could suit the one asked.
If I ask 320x240 with this list:
768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200
The smallest selectables modes are 384x240 and 320x400. And SDL choose the later
in this list, but 384x240 is more suitable. So I added a check to compare
the pixel count (surface) of modes, and select the one which has the smallest
pixel count.
In my example, 384x240 has 92160 pixels, and 320x400 has 128000 pixels. So now
SDL will choose 384x240 for the asked 320x240 mode.
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Thu, 19 Jan 2006 21:28:52 +0000 |
| parents | be9c9c8f6d53 |
| children | 782fd950bd46 c121d94672cb |
| rev | line source |
|---|---|
| 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
|
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 } |