mirror of
https://github.com/holub/mame
synced 2025-05-24 14:56:21 +03:00
done some more work on the sprites.. hopefully most are positioned a
bit better now.. still can't see how they get disabled tho, nor do I understand the rouge lines on top of some of them.. it either needs perfect precision or they're some kind of markers like sega used.. lots of bits set in the spriteram we don't use too.. (nw)
This commit is contained in:
Scott Stone
parent
a3862117f3
commit
0d35f15199
@ -304,9 +304,9 @@ static void draw_road(screen_device &screen, bitmap_ind16 &bitmap, const rectang
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static void draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int screen_shift)
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{
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cybertnk_state *state = screen.machine().driver_data<cybertnk_state>();
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const UINT8 *blit_ram = screen.machine().root_device().memregion("spr_gfx")->base();
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int offs,x,y,z,xsize,ysize,yi,xi,col_bank,fx,zoom;
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UINT32 spr_offs,spr_offs_helper;
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const UINT32 *sprrom = (UINT32*)screen.machine().root_device().memregion("spr_gfx")->base();
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int offs,x,y,xsize,ysize,yi,xi,col_bank,fx,zoom;
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UINT32 spr_offs,line_start_spr_offset;
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int xf,yf,xz,yz;
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const pen_t *paldata = screen.machine().pens;
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@ -316,72 +316,119 @@ static void draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rect
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int maxx = cliprect.max_x;
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UINT16* dest;
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/*
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o = offset
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y = ypos Y = ysize
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x = xpos X = xsize f = flipx
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Z = zoom
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C = colour
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+word offset
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CCCC CCCC ---- -ooo 0x0
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oooo oooo oooo oooo 0x1
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---- ---- ---y yyyy 0x2
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---- ---- ---- ---- 0x3
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---- ---- ---- YYYY 0x4
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f--- --xx xxxx xxxx 0x5
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ZZZZ ZZZZ ---- XXXX 0x6
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---- ---- ---- ---- 0x7
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*/
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for(offs=0;offs<0x1000/2;offs+=8)
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{
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z = (state->m_spr_ram[offs+(0x6/2)] & 0xffff);
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if(z == 0xffff || state->m_spr_ram[offs+(0x0/2)] == 0x0000) //TODO: check the correct bit
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continue;
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x = (state->m_spr_ram[offs+(0xa/2)] & 0x3ff);
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y = (state->m_spr_ram[offs+(0x4/2)] & 0xff);
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if(state->m_spr_ram[offs+(0x4/2)] & 0x100)
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y = 0x100 - y;
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spr_offs = (((state->m_spr_ram[offs+(0x0/2)] & 7) << 16) | (state->m_spr_ram[offs+(0x2/2)])) << 2;
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xsize = ((state->m_spr_ram[offs+(0xc/2)] & 0x000f)+1) << 3;
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ysize = (state->m_spr_ram[offs+(0x8/2)] & 0x00ff)+1;
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fx = (state->m_spr_ram[offs+(0xa/2)] & 0x8000) >> 15;
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zoom = (state->m_spr_ram[offs+(0xc/2)] & 0xff00) >> 8;
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// todo, how are sprites really disabled? our gunshots etc. still leave trails with this logic
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col_bank = (state->m_spr_ram[offs+(0x0/2)] & 0xff00) >> 8;
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if ((state->m_spr_ram[offs+0x3]) == 0xffff)
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continue;
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if ((state->m_spr_ram[offs+0x0]) == 0x0000)
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continue;
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x = (state->m_spr_ram[offs+0x5] & 0x3ff);
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if (x&0x200) x-=0x400;
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y = (state->m_spr_ram[offs+0x2] & 0x1ff);
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if (y&0x100) y-=0x200;
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spr_offs = (((state->m_spr_ram[offs+0x0] & 7) << 16) | (state->m_spr_ram[offs+0x1]));
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xsize = ((state->m_spr_ram[offs+0x6] & 0x000f)+1) << 3;
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ysize = (state->m_spr_ram[offs+0x4] & 0x00ff)+1;
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fx = (state->m_spr_ram[offs+0x5] & 0x8000) >> 15;
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zoom = (state->m_spr_ram[offs+0x6] & 0xff00) >> 8;
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col_bank = (state->m_spr_ram[offs+0x0] & 0xff00) >> 8;
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xf = 0;
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yf = 0;
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xz = 0;
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yz = 0;
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line_start_spr_offset = spr_offs;
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for(yi = 0;yi < ysize;yi++)
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{
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xf = xz = 0;
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spr_offs_helper = spr_offs;
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int yy = y+yz;
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if ((yy>=miny) && (yy<=maxy))
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{
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dest = &bitmap.pix16(yy, 0);
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for(xi=0;xi < xsize;xi+=8)
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int start,end,inc;
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if (!fx)
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{
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start = 0;
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end = xsize;
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inc = 8;
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}
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else
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{
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start = xsize-8;
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end = -8;
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inc = -8;
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}
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for(xi=start;xi != end;xi+=inc)
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{ // start x loop
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UINT32 color;
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color = sprrom[line_start_spr_offset+xi/8];
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UINT16 dot;
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int shift_pen, x_dec; //helpers
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int x_dec; //helpers
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// 4 bytes = 8 pixels..
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color = ((blit_ram[spr_offs+0] & 0xff) << 24);
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color|= ((blit_ram[spr_offs+1] & 0xff) << 16);
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color|= ((blit_ram[spr_offs+2] & 0xff) << 8);
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color|= ((blit_ram[spr_offs+3] & 0xff) << 0);
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int shift_pen = 0;
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shift_pen = 28;
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x_dec = 0;
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// draw 4 pixels
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while(x_dec < 4 && x_dec+xi <= xsize)
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// draw 8 pixels
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while(x_dec < 8)
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{
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dot = (color >> shift_pen) & 0xf;
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if (!fx)
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{
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dot = (color >> shift_pen) & 0xf;
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}
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else
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{
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dot = (color >> (28-shift_pen)) & 0xf;
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}
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if(dot != 0) // transparent pen
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{
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dot|= col_bank<<4;
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if(fx)
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{
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int xx = x+xsize-(xz)+screen_shift;
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CYBERTNK_DRAWPIXEL
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}
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else
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{
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int xx = x+xz+screen_shift;
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CYBERTNK_DRAWPIXEL
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}
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int xx = (x+xz)+screen_shift;
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CYBERTNK_DRAWPIXEL
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}
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xf+=zoom;
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if(xf >= 0x100)
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@ -389,57 +436,15 @@ static void draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rect
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xz++;
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xf-=0x100;
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}
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else
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else // next source pixel
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{
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shift_pen -= 8;
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shift_pen += 4;
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x_dec++;
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if(xf >= 0x80) { xz++; xf-=0x80; }
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}
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}
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shift_pen = 24;
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x_dec = 4;
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// draw 4 pixels
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while(x_dec < 8 && x_dec+xi <= xsize)
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{
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dot = (color >> shift_pen) & 0xf;
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if(dot != 0) // transparent pen
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{
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dot|= col_bank<<4;
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if(fx)
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{
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int xx = x+xsize-(xz)+screen_shift;
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CYBERTNK_DRAWPIXEL
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}
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else
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{
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int xx = x+xz+screen_shift;
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CYBERTNK_DRAWPIXEL
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}
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}
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xf+=zoom;
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if(xf >= 0x100)
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{
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xz++;
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xf-=0x100;
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}
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else
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{
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shift_pen -= 8;
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x_dec++;
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if(xf >= 0x80) { xz++; xf-=0x80; }
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}
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}
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spr_offs+=4;
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} // end x loop
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}
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else
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{
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spr_offs+=xsize/8;
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}
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yf+=zoom;
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@ -447,10 +452,13 @@ static void draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rect
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{
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yi--;
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yz++;
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spr_offs = spr_offs_helper;
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yf-=0x100;
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}
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if(yf >= 0x80) { yz++; yf-=0x80; }
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else // next line
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{
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line_start_spr_offset += xsize/8;
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if(yf >= 0x80) { yz++; yf-=0x80; }
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}
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}
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}
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}
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@ -957,4 +965,18 @@ ROM_START( cybertnk )
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ROM_LOAD( "ic30", 0x0260, 0x0020, CRC(2bb6033f) SHA1(eb994108734d7d04f8e293eca21bb3051a63cfe9) )
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ROM_END
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GAME( 1988, cybertnk, 0, cybertnk, cybertnk, 0, ROT0, "Coreland", "Cyber Tank (v1.04)", GAME_NOT_WORKING ) // it boots as 1.4, not 1.04?
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DRIVER_INIT( cybertnk )
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{
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UINT32 *spr = (UINT32*)machine.root_device().memregion("spr_gfx")->base();
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for (int x = 0; x< 0x200000/4;x++)
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{
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// reorder the data to simplify sprite drawing
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// we draw 8 pixels at a time, each each nibble contains a pixel, however the original order of 32-bits (8 pixels)
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// is along the lines of 04 15 26 37 which is awkward to use
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spr[x] = BITSWAP32(spr[x], 27,26,25,24, 19,18,17,16, 11,10,9,8, 3,2,1,0, 31,30,29,28, 23,22,21,20, 15,14,13,12, 7,6,5,4 );
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}
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}
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GAME( 1988, cybertnk, 0, cybertnk, cybertnk, cybertnk, ROT0, "Coreland", "Cyber Tank (v1.4)", GAME_NOT_WORKING )
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