c++ - DirectX7 SetPalette always failed -


i'm learning directx, want bind palette primarysurface, process failed. give code below:

#define screen_width 640 #define screen_height 480 #define screen_bpp 32 #define max_colors_palette 256  #define ddraw_init_struct(ddstruct) { memset(&ddstruct, 0, sizeof(ddstruct)); ddstruct.dwsize = sizeof(ddstruct); }  lpdirectdraw7 lpdd = null; lpdirectdrawsurface7 lpddprimarysurface = null; lpdirectdrawpalette lpddpalette = null; paletteentry palette[256];  // omit unneccessary content  int gameinit() {     if (failed(directdrawcreateex(null, (void**)&lpdd, iid_idirectdraw7, null)))         return 0;     if (failed(lpdd->setcooperativelevel(g_gamehwnd, ddscl_fullscreen | ddscl_allowmodex | ddscl_exclusive | ddscl_allowreboot)))         return 0;     if (failed(lpdd->setdisplaymode(screen_width, screen_height, screen_bpp, 0, 0)))         return 0;      ddraw_init_struct(ddsd);     ddsd.dwflags = ddsd_caps | ddsd_backbuffercount;     ddsd.dwbackbuffercount = 1;     ddsd.ddscaps.dwcaps = ddscaps_primarysurface | ddscaps_complex | ddscaps_flip;      if (failed(lpdd->createsurface(&ddsd, &lpddprimarysurface, null)))         return 0;      ddsd.ddscaps.dwcaps = ddscaps_backbuffer;     if (failed(lpddprimarysurface->getattachedsurface(&ddsd.ddscaps, &lpddbacksurface)))         return 0;      memset(palette, 0, max_colors_palette * sizeof(paletteentry));      (int index = 0; index < max_colors_palette; index++)     {         if (index < 64)             palette[index].pered = index * 4;         else if (index >= 64 && index < 128)             palette[index].pegreen = (index - 64) * 4;         else if (index >= 128 && index < 192)             palette[index].peblue = (index - 128) * 4;         else if (index >= 192 && index < 256)             palette[index].pered = palette[index].pegreen = palette[index].peblue = (index - 192) * 4;          palette[index].peflags = pc_nocollapse;     }      if (failed(lpdd->createpalette(ddpcaps_8bit | ddpcaps_allow256 | ddpcaps_initialize, palette, &lpddpalette, null)))         return 0;      **// failed set palette primary surface here....**     if (failed(lpddprimarysurface->setpalette(lpddpalette)))     {         messagebox(null, "failed", null, mb_ok);         return 0;     }      ddraw_init_struct(ddsd);      if (failed(lpddbacksurface->lock(null, &ddsd, ddlock_surfacememoryptr | ddlock_wait, null)))         return 0;      uint *videobuffer = (uint*)ddsd.lpsurface;      (int y = 0; y < screen_height; y++)     {         memset((void*)videobuffer, y % 256, screen_width * sizeof(uint));         videobuffer += ddsd.lpitch >> 2;     }      if (failed(lpddbacksurface->unlock(null)))         return 0;      return 1; }

i don't know why failed setpalette primary surface. set displaymode 640*480*32, palette 256-color, reason? consult msdn, createpalette can create 2bit, 4bit, 8bit palettes. can 32-bit display mode compatible 8bit palette? problem?

i grateful if give me advice. thanks.

anything greater 8-bit mode (16, 24, 32) direct color modes , data in frame buffer actual color, there no palette there in 8-bit indexed color mode.

to make example work is, change screen_bpp 8. problem in modern versions of windows may find palette doesn't stick , gets set system palette. there workarounds might try listed here: "exclusive" directdraw palette isn't exclusive

if want use 32-bit mode there no palette , must set color directly rather using index palette. copy palette color frame buffer in example:

if (failed(lpddbacksurface->lock(null, &ddsd, ddlock_surfacememoryptr | ddlock_wait, null)))     return 0;  uint *videobuffer = (uint*)ddsd.lpsurface;  (int y = 0; y < screen_height; y++) {     const paletteentry& p = palette[y%256];     uint color = (p.pered << 16) | (p.pegreen << 8) | p.peblue;     for(int x = 0; x < screen_width; ++x)     {         videobuffer[x] = color;     }     videobuffer += ddsd.lpitch / sizeof(uint); }  if (failed(lpddbacksurface->unlock(null)))     return 0;

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