#include "emu.h"
#include "includes/gberet.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
Green Beret has a 32 bytes palette PROM and two 256 bytes color lookup table
PROMs (one for sprites, one for characters).
The palette PROM is connected to the RGB output, this way:
bit 7 -- 220 ohm resistor -- BLUE
-- 470 ohm resistor -- BLUE
-- 220 ohm resistor -- GREEN
-- 470 ohm resistor -- GREEN
-- 1 kohm resistor -- GREEN
-- 220 ohm resistor -- RED
-- 470 ohm resistor -- RED
bit 0 -- 1 kohm resistor -- RED
***************************************************************************/
PALETTE_INIT( gberet )
{
int i;
/* allocate the colortable */
machine.colortable = colortable_alloc(machine, 0x20);
/* create a lookup table for the palette */
for (i = 0; i < 0x20; i++)
{
int bit0, bit1, bit2;
int r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b));
}
/* color_prom now points to the beginning of the lookup table */
color_prom += 0x20;
for (i = 0; i < 0x100; i++)
{
UINT8 ctabentry = (color_prom[i] & 0x0f) | 0x10;
colortable_entry_set_value(machine.colortable, i, ctabentry);
}
for (i = 0x100; i < 0x200; i++)
{
UINT8 ctabentry;
if (color_prom[i] & 0x0f)
ctabentry = color_prom[i] & 0x0f;
else
ctabentry = 0;
colortable_entry_set_value(machine.colortable, i, ctabentry);
}
}
WRITE8_HANDLER( gberet_videoram_w )
{
gberet_state *state = space->machine().driver_data<gberet_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( gberet_colorram_w )
{
gberet_state *state = space->machine().driver_data<gberet_state>();
state->m_colorram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( gberet_scroll_w )
{
gberet_state *state = space->machine().driver_data<gberet_state>();
int scroll;
state->m_scrollram[offset] = data;
scroll = state->m_scrollram[offset & 0x1f] | (state->m_scrollram[offset | 0x20] << 8);
tilemap_set_scrollx(state->m_bg_tilemap, offset & 0x1f, scroll);
}
WRITE8_HANDLER( gberet_sprite_bank_w )
{
gberet_state *state = space->machine().driver_data<gberet_state>();
state->m_spritebank = data;
}
static TILE_GET_INFO( get_bg_tile_info )
{
gberet_state *state = machine.driver_data<gberet_state>();
int attr = state->m_colorram[tile_index];
int code = state->m_videoram[tile_index] + ((attr & 0x40) << 2);
int color = attr & 0x0f;
int flags = TILE_FLIPYX((attr & 0x30) >> 4);
tileinfo->group = color;
tileinfo->category = (attr & 0x80) >> 7;
SET_TILE_INFO(0, code, color, flags);
}
VIDEO_START( gberet )
{
gberet_state *state = machine.driver_data<gberet_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 64, 32);
colortable_configure_tilemap_groups(machine.colortable, state->m_bg_tilemap, machine.gfx[0], 0x10);
tilemap_set_scroll_rows(state->m_bg_tilemap, 32);
}
static void gberet_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
gberet_state *state = machine.driver_data<gberet_state>();
int offs;
UINT8 *sr;
if (state->m_spritebank & 0x08)
sr = state->m_spriteram2;
else
sr = state->m_spriteram;
for (offs = 0; offs < 0xc0; offs += 4)
{
if (sr[offs + 3])
{
int attr = sr[offs + 1];
int code = sr[offs + 0] + ((attr & 0x40) << 2);
int color = attr & 0x0f;
int sx = sr[offs + 2] - 2 * (attr & 0x80);
int sy = sr[offs + 3];
int flipx = attr & 0x10;
int flipy = attr & 0x20;
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transmask(bitmap, cliprect, machine.gfx[1], code, color, flipx, flipy, sx, sy,
colortable_get_transpen_mask(machine.colortable, machine.gfx[1], color, 0));
}
}
}
SCREEN_UPDATE( gberet )
{
gberet_state *state = screen->machine().driver_data<gberet_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, TILEMAP_DRAW_OPAQUE | TILEMAP_DRAW_ALL_CATEGORIES, 0);
gberet_draw_sprites(screen->machine(), bitmap, cliprect);
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
return 0;
}
/* Green Beret (bootleg) */
WRITE8_HANDLER( gberetb_scroll_w )
{
gberet_state *state = space->machine().driver_data<gberet_state>();
int scroll = data;
if (offset)
scroll |= 0x100;
for (offset = 6; offset < 29; offset++)
tilemap_set_scrollx(state->m_bg_tilemap, offset, scroll + 64 - 8);
}
static void gberetb_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
gberet_state *state = machine.driver_data<gberet_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = state->m_spriteram_size - 4; offs >= 0; offs -= 4)
{
if (spriteram[offs + 1])
{
int attr = spriteram[offs + 3];
int code = spriteram[offs] + ((attr & 0x40) << 2);
int color = attr & 0x0f;
int sx = spriteram[offs + 2] - 2 * (attr & 0x80);
int sy = 240 - spriteram[offs + 1];
int flipx = attr & 0x10;
int flipy = attr & 0x20;
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transmask(bitmap, cliprect, machine.gfx[1], code, color, flipx, flipy, sx, sy,
colortable_get_transpen_mask(machine.colortable, machine.gfx[1], color, 0));
}
}
}
SCREEN_UPDATE( gberetb )
{
gberet_state *state = screen->machine().driver_data<gberet_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, TILEMAP_DRAW_OPAQUE | TILEMAP_DRAW_ALL_CATEGORIES, 0);
gberetb_draw_sprites(screen->machine(), bitmap, cliprect);
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
return 0;
}