Mercurial > sdl-ios-xcode
view test/testpalette.c @ 2079:1ed2155b7ee4
From: Torsten Giebl
Subject: ALLOCA Patch for SDL-1.2
Newsgroups: gmane.comp.lib.sdl
Date: 2006-10-24 00:31:16 GMT
Hello !
As alloca.h is not available on CYGWIN and MinGW32
it should not be checked there or it should be checked
with -mno-cygwin using.
I am a total configure.in newbie, but i found the way
that things are handled in configure.in pretty bad for the
case CYGWIN with MinGW Mode or not.
Maybe this is not possible but i would like to
have a way to detect at the start for example CYGWIN
and then add. ask if configure was called with --enable-cygwin
for example. --enable-cygwin should be optional and disabled
by default as we want to have MinGW Mode by default.
Only if the user wants it he should be able to use it.
Then the whole configure.in would get add. questions
okay the system is CYGWIN with or without MinGW Mode.
The alloca.h thing for example is only
available under CYGWIN ( without MinGW Mode ).
CU
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Fri, 01 Dec 2006 20:25:03 +0000 |
parents | c121d94672cb |
children | e27bdcc80744 |
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/* * testpalette.c * * A simple test of runtime palette modification for animation * (using the SDL_SetPalette() API). */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> /* This isn't in the Windows headers */ #ifndef M_PI #define M_PI 3.14159265358979323846 #endif #include "SDL.h" /* screen size */ #define SCRW 640 #define SCRH 480 #define NBOATS 5 #define SPEED 2 #ifndef MIN #define MIN(a, b) ((a) < (b) ? (a) : (b)) #endif #ifndef MAX #define MAX(a, b) ((a) > (b) ? (a) : (b)) #endif /* * wave colours: Made by taking a narrow cross-section of a wave picture * in Gimp, saving in PPM ascii format and formatting with Emacs macros. */ static SDL_Color wavemap[] = { {0, 2, 103}, {0, 7, 110}, {0, 13, 117}, {0, 19, 125}, {0, 25, 133}, {0, 31, 141}, {0, 37, 150}, {0, 43, 158}, {0, 49, 166}, {0, 55, 174}, {0, 61, 182}, {0, 67, 190}, {0, 73, 198}, {0, 79, 206}, {0, 86, 214}, {0, 96, 220}, {5, 105, 224}, {12, 112, 226}, {19, 120, 227}, {26, 128, 229}, {33, 135, 230}, {40, 143, 232}, {47, 150, 234}, {54, 158, 236}, {61, 165, 238}, {68, 173, 239}, {75, 180, 241}, {82, 188, 242}, {89, 195, 244}, {96, 203, 246}, {103, 210, 248}, {112, 218, 250}, {124, 224, 250}, {135, 226, 251}, {146, 229, 251}, {156, 231, 252}, {167, 233, 252}, {178, 236, 252}, {189, 238, 252}, {200, 240, 252}, {211, 242, 252}, {222, 244, 252}, {233, 247, 252}, {242, 249, 252}, {237, 250, 252}, {209, 251, 252}, {174, 251, 252}, {138, 252, 252}, {102, 251, 252}, {63, 250, 252}, {24, 243, 252}, {7, 225, 252}, {4, 203, 252}, {3, 181, 252}, {2, 158, 252}, {1, 136, 251}, {0, 111, 248}, {0, 82, 234}, {0, 63, 213}, {0, 50, 192}, {0, 39, 172}, {0, 28, 152}, {0, 17, 132}, {0, 7, 114} }; /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ static void quit(int rc) { SDL_Quit(); exit(rc); } static void sdlerr(char *when) { fprintf(stderr, "SDL error: %s: %s\n", when, SDL_GetError()); quit(1); } /* create a background surface */ static SDL_Surface * make_bg(SDL_Surface * screen, int startcol) { int i; SDL_Surface *bg = SDL_CreateRGBSurface(SDL_SWSURFACE, screen->w, screen->h, 8, 0, 0, 0, 0); if (!bg) sdlerr("creating background surface"); /* set the palette to the logical screen palette so that blits won't be translated */ SDL_SetColors(bg, screen->format->palette->colors, 0, 256); /* Make a wavy background pattern using colours 0-63 */ if (SDL_LockSurface(bg) < 0) sdlerr("locking background"); for (i = 0; i < SCRH; i++) { Uint8 *p = (Uint8 *) bg->pixels + i * bg->pitch; int j, d; d = 0; for (j = 0; j < SCRW; j++) { int v = MAX(d, -2); v = MIN(v, 2); if (i > 0) v += p[-bg->pitch] + 65 - startcol; p[j] = startcol + (v & 63); d += ((rand() >> 3) % 3) - 1; } } SDL_UnlockSurface(bg); return (bg); } /* * Return a surface flipped horisontally. Only works for 8bpp; * extension to arbitrary bitness is left as an exercise for the reader. */ static SDL_Surface * hflip(SDL_Surface * s) { int i; SDL_Surface *z = SDL_CreateRGBSurface(SDL_SWSURFACE, s->w, s->h, 8, 0, 0, 0, 0); /* copy palette */ SDL_SetColors(z, s->format->palette->colors, 0, s->format->palette->ncolors); if (SDL_LockSurface(s) < 0 || SDL_LockSurface(z) < 0) sdlerr("locking flip images"); for (i = 0; i < s->h; i++) { int j; Uint8 *from = (Uint8 *) s->pixels + i * s->pitch; Uint8 *to = (Uint8 *) z->pixels + i * z->pitch + s->w - 1; for (j = 0; j < s->w; j++) to[-j] = from[j]; } SDL_UnlockSurface(z); SDL_UnlockSurface(s); return z; } int main(int argc, char **argv) { SDL_Color cmap[256]; SDL_Surface *screen; SDL_Surface *bg; SDL_Surface *boat[2]; unsigned vidflags = 0; unsigned start; int fade_max = 400; int fade_level, fade_dir; int boatcols, frames, i, red; int boatx[NBOATS], boaty[NBOATS], boatdir[NBOATS]; int gamma_fade = 0; int gamma_ramp = 0; if (SDL_Init(SDL_INIT_VIDEO) < 0) sdlerr("initialising SDL"); while (--argc) { ++argv; if (strcmp(*argv, "-hw") == 0) vidflags |= SDL_HWSURFACE; else if (strcmp(*argv, "-fullscreen") == 0) vidflags |= SDL_FULLSCREEN; else if (strcmp(*argv, "-nofade") == 0) fade_max = 1; else if (strcmp(*argv, "-gamma") == 0) gamma_fade = 1; else if (strcmp(*argv, "-gammaramp") == 0) gamma_ramp = 1; else { fprintf(stderr, "usage: testpalette " " [-hw] [-fullscreen] [-nofade] [-gamma] [-gammaramp]\n"); quit(1); } } /* Ask explicitly for 8bpp and a hardware palette */ if ((screen = SDL_SetVideoMode(SCRW, SCRH, 8, vidflags | SDL_HWPALETTE)) == NULL) { fprintf(stderr, "error setting %dx%d 8bpp indexed mode: %s\n", SCRW, SCRH, SDL_GetError()); quit(1); } if (vidflags & SDL_FULLSCREEN) SDL_ShowCursor(SDL_FALSE); if ((boat[0] = SDL_LoadBMP("sail.bmp")) == NULL) sdlerr("loading sail.bmp"); /* We've chosen magenta (#ff00ff) as colour key for the boat */ SDL_SetColorKey(boat[0], SDL_SRCCOLORKEY | SDL_RLEACCEL, SDL_MapRGB(boat[0]->format, 0xff, 0x00, 0xff)); boatcols = boat[0]->format->palette->ncolors; boat[1] = hflip(boat[0]); SDL_SetColorKey(boat[1], SDL_SRCCOLORKEY | SDL_RLEACCEL, SDL_MapRGB(boat[1]->format, 0xff, 0x00, 0xff)); /* * First set the physical screen palette to black, so the user won't * see our initial drawing on the screen. */ memset(cmap, 0, sizeof(cmap)); SDL_SetPalette(screen, SDL_PHYSPAL, cmap, 0, 256); /* * Proper palette management is important when playing games with the * colormap. We have divided the palette as follows: * * index 0..(boatcols-1): used for the boat * index boatcols..(boatcols+63): used for the waves */ SDL_SetPalette(screen, SDL_LOGPAL, boat[0]->format->palette->colors, 0, boatcols); SDL_SetPalette(screen, SDL_LOGPAL, wavemap, boatcols, 64); /* * Now the logical screen palette is set, and will remain unchanged. * The boats already have the same palette so fast blits can be used. */ memcpy(cmap, screen->format->palette->colors, 256 * sizeof(SDL_Color)); /* save the index of the red colour for later */ red = SDL_MapRGB(screen->format, 0xff, 0x00, 0x00); bg = make_bg(screen, boatcols); /* make a nice wavy background surface */ /* initial screen contents */ if (SDL_BlitSurface(bg, NULL, screen, NULL) < 0) sdlerr("blitting background to screen"); SDL_Flip(screen); /* actually put the background on screen */ /* determine initial boat placements */ for (i = 0; i < NBOATS; i++) { boatx[i] = (rand() % (SCRW + boat[0]->w)) - boat[0]->w; boaty[i] = i * (SCRH - boat[0]->h) / (NBOATS - 1); boatdir[i] = ((rand() >> 5) & 1) * 2 - 1; } start = SDL_GetTicks(); frames = 0; fade_dir = 1; fade_level = 0; do { SDL_Event e; SDL_Rect updates[NBOATS]; SDL_Rect r; int redphase; /* A small event loop: just exit on any key or mouse button event */ while (SDL_PollEvent(&e)) { if (e.type == SDL_KEYDOWN || e.type == SDL_QUIT || e.type == SDL_MOUSEBUTTONDOWN) { if (fade_dir < 0) fade_level = 0; fade_dir = -1; } } /* move boats */ for (i = 0; i < NBOATS; i++) { int old_x = boatx[i]; /* update boat position */ boatx[i] += boatdir[i] * SPEED; if (boatx[i] <= -boat[0]->w || boatx[i] >= SCRW) boatdir[i] = -boatdir[i]; /* paint over the old boat position */ r.x = old_x; r.y = boaty[i]; r.w = boat[0]->w; r.h = boat[0]->h; if (SDL_BlitSurface(bg, &r, screen, &r) < 0) sdlerr("blitting background"); /* construct update rectangle (bounding box of old and new pos) */ updates[i].x = MIN(old_x, boatx[i]); updates[i].y = boaty[i]; updates[i].w = boat[0]->w + SPEED; updates[i].h = boat[0]->h; /* clip update rectangle to screen */ if (updates[i].x < 0) { updates[i].w += updates[i].x; updates[i].x = 0; } if (updates[i].x + updates[i].w > SCRW) updates[i].w = SCRW - updates[i].x; } for (i = 0; i < NBOATS; i++) { /* paint boat on new position */ r.x = boatx[i]; r.y = boaty[i]; if (SDL_BlitSurface(boat[(boatdir[i] + 1) / 2], NULL, screen, &r) < 0) sdlerr("blitting boat"); } /* cycle wave palette */ for (i = 0; i < 64; i++) cmap[boatcols + ((i + frames) & 63)] = wavemap[i]; if (fade_dir) { /* Fade the entire palette in/out */ fade_level += fade_dir; if (gamma_fade) { /* Fade linearly in gamma level (lousy) */ float level = (float) fade_level / fade_max; if (SDL_SetGamma(level, level, level) < 0) sdlerr("setting gamma"); } else if (gamma_ramp) { /* Fade using gamma ramp (better) */ Uint16 ramp[256]; for (i = 0; i < 256; i++) ramp[i] = (i * fade_level / fade_max) << 8; if (SDL_SetGammaRamp(ramp, ramp, ramp) < 0) sdlerr("setting gamma ramp"); } else { /* Fade using direct palette manipulation (best) */ memcpy(cmap, screen->format->palette->colors, boatcols * sizeof(SDL_Color)); for (i = 0; i < boatcols + 64; i++) { cmap[i].r = cmap[i].r * fade_level / fade_max; cmap[i].g = cmap[i].g * fade_level / fade_max; cmap[i].b = cmap[i].b * fade_level / fade_max; } } if (fade_level == fade_max) fade_dir = 0; } /* pulse the red colour (done after the fade, for a night effect) */ redphase = frames % 64; cmap[red].r = (int) (255 * sin(redphase * M_PI / 63)); SDL_SetPalette(screen, SDL_PHYSPAL, cmap, 0, boatcols + 64); /* update changed areas of the screen */ SDL_UpdateRects(screen, NBOATS, updates); frames++; } while (fade_level > 0); printf("%d frames, %.2f fps\n", frames, 1000.0 * frames / (SDL_GetTicks() - start)); if (vidflags & SDL_FULLSCREEN) SDL_ShowCursor(SDL_TRUE); SDL_Quit(); return 0; }