Mercurial > sdl-ios-xcode
view test/testpalette.c @ 937:1e6366bde299
Date: Tue, 27 Jul 2004 17:14:00 +0200
From: "Eckhard Stolberg"
Subject: Controller names in SDL for Windows
I'm working on an Atari 2600 emulator for different systems that uses
the SDL. Some time ago someone created an adaptor that lets you use
your old Atari controllers with your computer through the USB port.
Some of the Atari controllers require special handling by the emulator,
so it would be nice, if it would be possible to detect if any of the
controllers connected to the computer is this adaptor.
SDL would allow that with the SDL_JoystickName function, but unfortunately
it doesn't work properly on Windows. On Linux and MacOSX this function
returns the name of the controller, but on Windows you'll only get the
name of the joystick driver. Most joysticks nowadays use the generic
Microsoft driver, so they all return the same name.
In an old MSDN article
(http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarinput/html/msdn_extdirect.asp)
Microsoft describes how to read out the OEM controller names from the registry.
I have implemented this for the SDL controller handler on Windows,
and now reading the joystick name works properly there too.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 21 Aug 2004 03:45:58 +0000 |
parents | 74212992fb08 |
children | be9c9c8f6d53 |
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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} }; static void sdlerr(char *when) { fprintf(stderr, "SDL error: %s: %s\n", when, SDL_GetError()); exit(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"); atexit(SDL_Quit); 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"); return 1; } } /* Ask explicitly for 8bpp and a hardware palette */ if(!(screen = SDL_SetVideoMode(SCRW, SCRH, 8, vidflags | SDL_HWPALETTE))) { fprintf(stderr, "error setting %dx%d 8bpp indexed mode: %s\n", SCRW, SCRH, SDL_GetError()); return 1; } if(!(boat[0] = SDL_LoadBMP("sail.bmp"))) 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)); return 0; }