Mercurial > sdl-ios-xcode
view test/testpalette.c @ 2884:9dde605c7540
Date: Fri, 19 Dec 2008 20:17:35 +0100
From: Couriersud
Subject: Re: Aw: Experience using SDL1.3 in sdlmame/Proposal for api additions
> For consistency you'd probably want:
> SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a);
> SDL_SetRenderDrawBlendMode(SDL_BlendMode blendMode);
> SDL_RenderLine(int x1, int y1, int x2, int y2);
> SDL_RenderFill(SDL_Rect *rect);
>
> You probably also want to add API functions query the current state.
>
I have implemented the above api for the opengl, x11, directfb and
software renderers. I have also renamed *TEXTUREBLENDMODE* constants to
BLENDMODE*. The unix build compiles. The windows renderer still needs to
be updated, but I have no windows development machine at hand. Have a
look at the x11 renderer for a sample.
Vector games now run at 90% both on opengl and directfb in comparison to
sdlmame's own opengl renderer. The same applies to raster games.
The diff also includes
a) Changed XDrawRect to XFillRect in x11 renderer
b) A number of changes to fix blending and modulation issues in the
directfb renderer.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 20 Dec 2008 12:00:00 +0000 |
parents | 422452508c76 |
children | 06f0768a904c |
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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_SetSurfacePalette(bg, screen->format->palette); /* 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; if (boatcols >= 256) sdlerr("too many colors in sail.bmp"); 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; }