/***************************************************************************
-= Power Instinct =-
(C) 1993 Atlus
driver by Luca Elia (l.elia@tin.it)
Note: if MAME_DEBUG is defined, pressing Z with:
Q shows layer 1
W shows layer 2
A shows the sprites
Keys can be used togheter!
[ 2 Scrolling Layers ]
Each Layer is made of various pages of 256x256 pixels.
[Layer 0]
Pages: 16x2
Tiles: 16x16x4
Scroll: X,Y
[Layer 1]
Pages: 2x1
Tiles: 8x8x4
Scroll: No
[ 256 Sprites ]
Each sprite is made of a variable amount of 16x16 tiles.
Size can therefore vary from 16x16 (1 tile) to 256x256
(16x16 tiles)
**************************************************************************/
#include "driver.h"
/* Variables that driver has access to: */
UINT16 *powerins_vram_0, *powerins_vctrl_0;
UINT16 *powerins_vram_1, *powerins_vctrl_1;
//UINT16 *powerins_vregs;
/* Variables only used here: */
static tilemap *tilemap_0, *tilemap_1;
static int tile_bank;
/***************************************************************************
Hardware registers access
***************************************************************************/
WRITE16_HANDLER( powerins_flipscreen_w )
{
if (ACCESSING_LSB) flip_screen_set( data & 1 );
}
WRITE16_HANDLER( powerins_tilebank_w )
{
if (ACCESSING_LSB)
{
if (data != tile_bank)
{
tile_bank = data; // Tiles Bank (VRAM 0)
tilemap_mark_all_tiles_dirty(tilemap_0);
}
}
}
/***************************************************************************
Palette
***************************************************************************/
WRITE16_HANDLER( powerins_paletteram16_w )
{
/* byte 0 byte 1 */
/* RRRR GGGG BBBB RGBx */
/* 4321 4321 4321 000x */
UINT16 newword = COMBINE_DATA(&paletteram16[offset]);
int r = ((newword >> 11) & 0x1E ) | ((newword >> 3) & 0x01);
int g = ((newword >> 7) & 0x1E ) | ((newword >> 2) & 0x01);
int b = ((newword >> 3) & 0x1E ) | ((newword >> 1) & 0x01);
palette_set_color_rgb( Machine,offset, pal5bit(r),pal5bit(g),pal5bit(b) );
}
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
/***************************************************************************
[ Tiles Format VRAM 0]
Offset:
0.w fedc ---- ---- ---- Color Low Bits
---- b--- ---- ---- Color High Bit
---- -a98 7654 3210 Code (Banked)
***************************************************************************/
/* Layers are made of 256x256 pixel pages */
#define TILES_PER_PAGE_X (0x10)
#define TILES_PER_PAGE_Y (0x10)
#define TILES_PER_PAGE (TILES_PER_PAGE_X * TILES_PER_PAGE_Y)
#define DIM_NX_0 (0x100)
#define DIM_NY_0 (0x20)
static TILE_GET_INFO( get_tile_info_0 )
{
UINT16 code = powerins_vram_0[tile_index];
SET_TILE_INFO(
0,
(code & 0x07ff) + (tile_bank*0x800),
((code & 0xf000) >> (16-4)) + ((code & 0x0800) >> (11-4)),
0);
}
WRITE16_HANDLER( powerins_vram_0_w )
{
COMBINE_DATA(&powerins_vram_0[offset]);
tilemap_mark_tile_dirty(tilemap_0, offset);
}
static TILEMAP_MAPPER( powerins_get_memory_offset_0 )
{
return (col * TILES_PER_PAGE_Y) +
(row % TILES_PER_PAGE_Y) +
(row / TILES_PER_PAGE_Y) * (TILES_PER_PAGE * 16);
}
/***************************************************************************
[ Tiles Format VRAM 1]
Offset:
0.w fedc ---- ---- ---- Color
---- ba98 7654 3210 Code
***************************************************************************/
#define DIM_NX_1 (0x40)
#define DIM_NY_1 (0x20)
static TILE_GET_INFO( get_tile_info_1 )
{
UINT16 code = powerins_vram_1[tile_index];
SET_TILE_INFO(
1,
code & 0x0fff,
(code & 0xf000) >> (16-4),
0);
}
WRITE16_HANDLER( powerins_vram_1_w )
{
COMBINE_DATA(&powerins_vram_1[offset]);
tilemap_mark_tile_dirty(tilemap_1, offset);
}
/***************************************************************************
Vh_Start
***************************************************************************/
VIDEO_START( powerins )
{
tilemap_0 = tilemap_create( get_tile_info_0,
powerins_get_memory_offset_0,
TILEMAP_TYPE_PEN,
16,16,
DIM_NX_0, DIM_NY_0 );
tilemap_1 = tilemap_create( get_tile_info_1,
tilemap_scan_cols,
TILEMAP_TYPE_PEN,
8,8,
DIM_NX_1, DIM_NY_1 );
tilemap_set_scroll_rows(tilemap_0,1);
tilemap_set_scroll_cols(tilemap_0,1);
tilemap_set_scroll_rows(tilemap_1,1);
tilemap_set_scroll_cols(tilemap_1,1);
tilemap_set_transparent_pen(tilemap_1,15);
}
/***************************************************************************
Sprites Drawing
***************************************************************************/
/* --------------------------[ Sprites Format ]----------------------------
Offset: Format: Value:
00 fedc ba98 7654 321- -
---- ---- ---- ---0 Display this sprite
02 fed- ---- ---- ---- -
---c ---- ---- ---- Flip X
---- ba9- ---- ---- -
---- ---8 ---- ---- Code High Bit
---- ---- 7654 ---- Number of tiles along Y, minus 1 (1-16)
---- ---- ---- 3210 Number of tiles along X, minus 1 (1-16)
04 Unused?
06 f--- ---- ---- ---- -
-edc ba98 7654 3210 Code Low Bits
08 X
0A Unused?
0C Y
0E fedc ba98 76-- ---- -
---- ---- --54 3210 Color
------------------------------------------------------------------------ */
#define SIGN_EXTEND_POS(_var_) {_var_ &= 0x3ff; if (_var_ > 0x1ff) _var_ -= 0x400;}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect)
{
UINT16 *source = spriteram16 + 0x8000/2;
UINT16 *finish = spriteram16 + 0x9000/2;
int screen_w = machine->screen[0].width;
int screen_h = machine->screen[0].height;
for ( ; source < finish; source += 16/2 )
{
int x,y,inc;
int attr = source[ 0x0/2 ];
int size = source[ 0x2/2 ];
int code = source[ 0x6/2 ];
int sx = source[ 0x8/2 ];
int sy = source[ 0xc/2 ];
int color = source[ 0xe/2 ];
int flipx = size & 0x1000;
int flipy = 0; // ??
int dimx = ((size >> 0) & 0xf ) + 1;
int dimy = ((size >> 4) & 0xf ) + 1;
if (!(attr&1)) continue;
SIGN_EXTEND_POS(sx)
SIGN_EXTEND_POS(sy)
/* Handle flip_screen. Apply a global offset of 32 pixels along x too */
if (flip_screen)
{ sx = screen_w - sx - dimx*16 - 32; flipx = !flipx;
sy = screen_h - sy - dimy*16; flipy = !flipy;
code += dimx*dimy-1; inc = -1; }
else
{ sx += 32; inc = +1; }
code = (code & 0x7fff) + ( (size & 0x0100) << 7 );
for (x = 0 ; x < dimx ; x++)
{
for (y = 0 ; y < dimy ; y++)
{
drawgfx(bitmap,machine->gfx[2],
code,
color,
flipx, flipy,
sx + x*16,
sy + y*16,
cliprect,TRANSPARENCY_PEN,15);
code += inc;
}
}
}
}
/***************************************************************************
Screen Drawing
***************************************************************************/
VIDEO_UPDATE( powerins )
{
int layers_ctrl = -1;
int scrollx = (powerins_vctrl_0[2/2]&0xff) + (powerins_vctrl_0[0/2]&0xff)*256;
int scrolly = (powerins_vctrl_0[6/2]&0xff) + (powerins_vctrl_0[4/2]&0xff)*256;
tilemap_set_scrollx( tilemap_0, 0, scrollx - 0x20);
tilemap_set_scrolly( tilemap_0, 0, scrolly );
tilemap_set_scrollx( tilemap_1, 0, -0x20); // fixed offset
tilemap_set_scrolly( tilemap_1, 0, 0x00);
#ifdef MAME_DEBUG
if (input_code_pressed(KEYCODE_Z))
{
int msk = 0;
if (input_code_pressed(KEYCODE_Q)) msk |= 1;
if (input_code_pressed(KEYCODE_W)) msk |= 2;
// if (input_code_pressed(KEYCODE_E)) msk |= 4;
if (input_code_pressed(KEYCODE_A)) msk |= 8;
if (msk != 0) layers_ctrl &= msk;
}
#endif
if (layers_ctrl&1) tilemap_draw(bitmap,cliprect, tilemap_0, 0, 0);
else fillbitmap(bitmap,machine->pens[0],cliprect);
if (layers_ctrl&8) draw_sprites(machine,bitmap,cliprect);
if (layers_ctrl&2) tilemap_draw(bitmap,cliprect, tilemap_1, 0, 0);
return 0;
}