/*** Video *******************************************************************/
/* see drivers/pgm.c for notes on where improvements can be made */
#include "emu.h"
#include "includes/pgm.h"
/* Sprites - These are a pain! */
/* this decodes one of the funky sprites to a bitmap so we can draw it more easily -- slow but easier to use*/
static void pgm_prepare_sprite( running_machine &machine, int wide, int high, int palt, int boffset )
{
pgm_state *state = machine.driver_data<pgm_state>();
UINT8 *bdata = machine.region("sprmask")->base();
size_t bdatasize = machine.region("sprmask")->bytes() - 1;
UINT8 *adata = state->m_sprite_a_region;
size_t adatasize = state->m_sprite_a_region_size - 1;
int xcnt, ycnt;
UINT32 aoffset;
UINT16 msk;
aoffset = (bdata[(boffset + 3) & bdatasize] << 24) | (bdata[(boffset + 2) & bdatasize] << 16) |
(bdata[(boffset + 1) & bdatasize] << 8) | (bdata[(boffset + 0) & bdatasize] << 0);
aoffset = aoffset >> 2; aoffset *= 3;
boffset += 4; /* because the first dword is the a data offset */
for (ycnt = 0 ; ycnt < high ; ycnt++)
{
for (xcnt = 0 ; xcnt < wide ; xcnt++)
{
int x;
msk = ((bdata[(boffset + 1) & bdatasize] << 8) |( bdata[(boffset + 0) & bdatasize] << 0));
for (x = 0; x < 16; x++)
{
if (!(msk & 0x0001))
{
state->m_sprite_temp_render[(ycnt * (wide * 16))+(xcnt * 16 + x)] = adata[aoffset & adatasize] + palt * 32;
aoffset++;
}
else
{
state->m_sprite_temp_render[(ycnt * (wide * 16)) + (xcnt * 16 + x)] = 0x8000;
}
msk >>= 1;
}
boffset += 2;
}
}
}
// in the dest bitmap 0x10000 is used to mark 'used pixel' and 0x8000 is used to mark 'high priority'
static void draw_sprite_line( running_machine &machine, int wide, UINT32* dest, int xzoom, int xgrow, int yoffset, int flip, int xpos, int pri )
{
pgm_state *state = machine.driver_data<pgm_state>();
int xcnt,xcntdraw;
int xzoombit;
int xoffset;
int xdrawpos = 0;
xcnt = 0;
xcntdraw = 0;
while (xcnt < wide * 16)
{
UINT32 srcdat;
if (!(flip & 0x01))
xoffset = xcnt;
else
xoffset = (wide * 16) - xcnt - 1;
srcdat = state->m_sprite_temp_render[yoffset + xoffset];
xzoombit = (xzoom >> (xcnt & 0x1f)) & 1;
if (xzoombit == 1 && xgrow == 1)
{ // double this column
xdrawpos = xpos + xcntdraw;
if (!(srcdat & 0x8000))
{
if ((xdrawpos >= 0) && (xdrawpos < 448))
{
if (pri)
dest[xdrawpos] = srcdat | 0x8000 | 0x10000;
else
dest[xdrawpos] = srcdat | 0x10000;
}
}
xcntdraw++;
xdrawpos = xpos + xcntdraw;
if (!(srcdat & 0x8000))
{
if ((xdrawpos >= 0) && (xdrawpos < 448))
{
if (pri)
dest[xdrawpos] = srcdat | 0x8000 | 0x10000;
else
dest[xdrawpos] = srcdat | 0x10000;
}
}
xcntdraw++;
}
else if (xzoombit == 1 && xgrow == 0)
{
/* skip this column */
}
else //normal column
{
xdrawpos = xpos + xcntdraw;
if (!(srcdat & 0x8000))
{
if ((xdrawpos >= 0) && (xdrawpos < 448))
{
if (pri)
dest[xdrawpos] = srcdat | 0x8000 | 0x10000;
else
dest[xdrawpos] = srcdat | 0x10000;
}
}
xcntdraw++;
}
xcnt++;
if (xdrawpos == 448) xcnt = wide*16;
}
}
/* this just loops over our decoded bitmap and puts it on the screen */
static void draw_sprite_new_zoomed( running_machine &machine, int wide, int high, int xpos, int ypos, int palt, int boffset, int flip, bitmap_t* bitmap, UINT32 xzoom, int xgrow, UINT32 yzoom, int ygrow, int pri )
{
int ycnt;
int ydrawpos;
UINT32 *dest;
int yoffset;
int ycntdraw;
int yzoombit;
pgm_prepare_sprite(machine, wide,high, palt, boffset);
/* now draw it */
ycnt = 0;
ycntdraw = 0;
while (ycnt < high)
{
yzoombit = (yzoom >> (ycnt & 0x1f)) & 1;
if (yzoombit == 1 && ygrow == 1) // double this line
{
ydrawpos = ypos + ycntdraw;
if (!(flip & 0x02))
yoffset = (ycnt * (wide * 16));
else
yoffset = ((high - ycnt - 1) * (wide * 16));
if ((ydrawpos >= 0) && (ydrawpos < 224))
{
dest = BITMAP_ADDR32(bitmap, ydrawpos, 0);
draw_sprite_line(machine, wide, dest, xzoom, xgrow, yoffset, flip, xpos, pri);
}
ycntdraw++;
ydrawpos = ypos + ycntdraw;
if (!(flip & 0x02))
yoffset = (ycnt * (wide * 16));
else
yoffset = ((high - ycnt - 1) * (wide * 16));
if ((ydrawpos >= 0) && (ydrawpos < 224))
{
dest = BITMAP_ADDR32(bitmap, ydrawpos, 0);
draw_sprite_line(machine, wide, dest, xzoom, xgrow, yoffset, flip, xpos, pri);
}
ycntdraw++;
if (ydrawpos ==224)
ycnt = high;
}
else if (yzoombit == 1 && ygrow == 0)
{
/* skip this line */
/* we should process anyway if we don't do the pre-decode.. */
}
else /* normal line */
{
ydrawpos = ypos + ycntdraw;
if (!(flip & 0x02))
yoffset = (ycnt * (wide * 16));
else
yoffset = ((high - ycnt - 1) * (wide * 16));
if ((ydrawpos >= 0) && (ydrawpos < 224))
{
dest = BITMAP_ADDR32(bitmap, ydrawpos, 0);
draw_sprite_line(machine, wide, dest, xzoom, xgrow, yoffset, flip, xpos, pri);
}
ycntdraw++;
if (ydrawpos == 224)
ycnt = high;
}
ycnt++;
}
}
static void draw_sprites( running_machine &machine, bitmap_t* spritebitmap, UINT16 *sprite_source )
{
/* ZZZZ Zxxx xxxx xxxx
zzzz z-yy yyyy yyyy
-ffp pppp Pvvv vvvv
vvvv vvvv vvvv vvvv
wwww wwwh hhhh hhhh
*/
pgm_state *state = machine.driver_data<pgm_state>();
const UINT16 *finish = state->m_spritebufferram + (0xa00 / 2);
while (sprite_source < finish)
{
int xpos = sprite_source[0] & 0x07ff;
int ypos = sprite_source[1] & 0x03ff;
int xzom = (sprite_source[0] & 0x7800) >> 11;
int xgrow = (sprite_source[0] & 0x8000) >> 15;
int yzom = (sprite_source[1] & 0x7800) >> 11;
int ygrow = (sprite_source[1] & 0x8000) >> 15;
int palt = (sprite_source[2] & 0x1f00) >> 8;
int flip = (sprite_source[2] & 0x6000) >> 13;
int boff = ((sprite_source[2] & 0x007f) << 16) | (sprite_source[3] & 0xffff);
int wide = (sprite_source[4] & 0x7e00) >> 9;
int high = sprite_source[4] & 0x01ff;
int pri = (sprite_source[2] & 0x0080) >> 7;
UINT32 xzoom, yzoom;
UINT16* sprite_zoomtable = &state->m_videoregs[0x1000 / 2];
if (xgrow)
{
// xzom = 0xf - xzom; // would make more sense but everything gets zoomed slightly in dragon world 2 ?!
xzom = 0x10 - xzom; // this way it doesn't but there is a bad line when zooming after the level select?
}
if (ygrow)
{
// yzom = 0xf - yzom; // see comment above
yzom = 0x10 - yzom;
}
xzoom = (sprite_zoomtable[xzom * 2] << 16) | sprite_zoomtable[xzom * 2 + 1];
yzoom = (sprite_zoomtable[yzom * 2] << 16) | sprite_zoomtable[yzom * 2 + 1];
boff *= 2;
if (xpos > 0x3ff) xpos -=0x800;
if (ypos > 0x1ff) ypos -=0x400;
if (!sprite_source[4]) break; /* is this right? */
//if ((priority == 1) && (pri == 0)) break;
draw_sprite_new_zoomed(machine, wide, high, xpos, ypos, palt, boff, flip, spritebitmap, xzoom, xgrow, yzoom, ygrow, pri);
sprite_source += 5;
}
}
/* TX Layer */
WRITE16_HANDLER( pgm_tx_videoram_w )
{
pgm_state *state = space->machine().driver_data<pgm_state>();
state->m_tx_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_tx_tilemap, offset / 2);
}
static TILE_GET_INFO( get_pgm_tx_tilemap_tile_info )
{
/* 0x904000 - 0x90ffff is the Text Overlay Ram (pgm_tx_videoram)
each tile uses 4 bytes, the tilemap is 64x128?
the layer uses 4bpp 8x8 tiles from the 'T' roms
colours from 0xA01000 - 0xA017FF
scroll registers are at 0xB05000 (Y) and 0xB06000 (X)
---- ---- ffpp ppp- nnnn nnnn nnnn nnnn
n = tile number
p = palette
f = flip
*/
pgm_state *state = machine.driver_data<pgm_state>();
int tileno, colour, flipyx; //,game;
tileno = state->m_tx_videoram[tile_index * 2] & 0xffff;
colour = (state->m_tx_videoram[tile_index * 2 + 1] & 0x3e) >> 1;
flipyx = (state->m_tx_videoram[tile_index * 2 + 1] & 0xc0) >> 6;
SET_TILE_INFO(0,tileno,colour,TILE_FLIPYX(flipyx));
}
/* BG Layer */
WRITE16_HANDLER( pgm_bg_videoram_w )
{
pgm_state *state = space->machine().driver_data<pgm_state>();
state->m_bg_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset / 2);
}
static TILE_GET_INFO( get_pgm_bg_tilemap_tile_info )
{
/* pretty much the same as tx layer */
pgm_state *state = machine.driver_data<pgm_state>();
int tileno, colour, flipyx;
tileno = state->m_bg_videoram[tile_index *2] & 0xffff;
colour = (state->m_bg_videoram[tile_index * 2 + 1] & 0x3e) >> 1;
flipyx = (state->m_bg_videoram[tile_index * 2 + 1] & 0xc0) >> 6;
SET_TILE_INFO(1,tileno,colour,TILE_FLIPYX(flipyx));
}
/*** Video - Start / Update ****************************************************/
VIDEO_START( pgm )
{
pgm_state *state = machine.driver_data<pgm_state>();
int i;
state->m_tx_tilemap = tilemap_create(machine, get_pgm_tx_tilemap_tile_info, tilemap_scan_rows, 8, 8, 64, 32);
tilemap_set_transparent_pen(state->m_tx_tilemap, 15);
state->m_bg_tilemap = tilemap_create(machine, get_pgm_bg_tilemap_tile_info, tilemap_scan_rows, 32, 32, 64, 16);
tilemap_set_transparent_pen(state->m_bg_tilemap, 31);
tilemap_set_scroll_rows(state->m_bg_tilemap, 16 * 32);
state->m_tmppgmbitmap = auto_bitmap_alloc(machine, 448, 224, BITMAP_FORMAT_RGB32);
for (i = 0; i < 0x1200 / 2; i++)
palette_set_color(machine, i, MAKE_RGB(0, 0, 0));
state->m_spritebufferram = auto_alloc_array(machine, UINT16, 0xa00/2);
/* we render each sprite to a bitmap then copy the bitmap to screen bitmap with zooming */
/* easier this way because of the funky sprite format */
state->m_sprite_temp_render = auto_alloc_array(machine, UINT16, 0x400*0x200);
state->save_pointer(NAME(state->m_spritebufferram), 0xa00/2);
state->save_pointer(NAME(state->m_sprite_temp_render), 0x400*0x200);
state->save_item(NAME(*state->m_tmppgmbitmap));
}
SCREEN_UPDATE( pgm )
{
pgm_state *state = screen->machine().driver_data<pgm_state>();
int y;
bitmap_fill(bitmap, cliprect, get_black_pen(screen->machine()));
bitmap_fill(state->m_tmppgmbitmap, cliprect, 0x00000000);
draw_sprites(screen->machine(), state->m_tmppgmbitmap, state->m_spritebufferram);
tilemap_set_scrolly(state->m_bg_tilemap,0, state->m_videoregs[0x2000/2]);
for (y = 0; y < 224; y++)
tilemap_set_scrollx(state->m_bg_tilemap, (y + state->m_videoregs[0x2000 / 2]) & 0x1ff, state->m_videoregs[0x3000 / 2] + state->m_rowscrollram[y]);
{
int y, x;
for (y = 0; y < 224; y++)
{
UINT32* src = BITMAP_ADDR32(state->m_tmppgmbitmap, y, 0);
UINT16* dst = BITMAP_ADDR16(bitmap, y, 0);
for (x = 0; x < 448; x++)
{
if (src[x] & 0x10000)
if ((src[x] & 0x8000) == 0x8000)
dst[x] = src[x] & 0x7fff;
}
}
}
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
{
int y, x;
for (y = 0; y < 224; y++)
{
UINT32* src = BITMAP_ADDR32(state->m_tmppgmbitmap, y, 0);
UINT16* dst = BITMAP_ADDR16(bitmap, y, 0);
for (x = 0; x < 448; x++)
{
if (src[x] & 0x10000)
if ((src[x] & 0x8000) == 0x0000)
dst[x] = src[x];
}
}
}
tilemap_set_scrolly(state->m_tx_tilemap, 0, state->m_videoregs[0x5000/2]);
tilemap_set_scrollx(state->m_tx_tilemap, 0, state->m_videoregs[0x6000/2]); // Check
tilemap_draw(bitmap, cliprect, state->m_tx_tilemap, 0, 0);
return 0;
}
SCREEN_EOF( pgm )
{
pgm_state *state = machine.driver_data<pgm_state>();
/* first 0xa00 of main ram = sprites, seems to be buffered, DMA? */
memcpy(state->m_spritebufferram, pgm_mainram, 0xa00);
}