/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/kchamp.h"
PALETTE_INIT( kchamp )
{
int i, red, green, blue;
for (i = 0; i < machine.total_colors(); i++)
{
red = color_prom[i];
green = color_prom[machine.total_colors() + i];
blue = color_prom[2 * machine.total_colors() + i];
palette_set_color_rgb(machine, i, pal4bit(red), pal4bit(green), pal4bit(blue));
}
}
WRITE8_HANDLER( kchamp_videoram_w )
{
kchamp_state *state = space->machine().driver_data<kchamp_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( kchamp_colorram_w )
{
kchamp_state *state = space->machine().driver_data<kchamp_state>();
state->m_colorram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( kchamp_flipscreen_w )
{
flip_screen_set(space->machine(), data & 0x01);
}
static TILE_GET_INFO( get_bg_tile_info )
{
kchamp_state *state = machine.driver_data<kchamp_state>();
int code = state->m_videoram[tile_index] + ((state->m_colorram[tile_index] & 7) << 8);
int color = (state->m_colorram[tile_index] >> 3) & 0x1f;
SET_TILE_INFO(0, code, color, 0);
}
VIDEO_START( kchamp )
{
kchamp_state *state = machine.driver_data<kchamp_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
}
/*
Sprites
-------
Offset Encoding
0 YYYYYYYY
1 TTTTTTTT
2 FGGTCCCC
3 XXXXXXXX
*/
static void kchamp_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
kchamp_state *state = machine.driver_data<kchamp_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = 0; offs < 0x100; offs += 4)
{
int attr = spriteram[offs + 2];
int bank = 1 + ((attr & 0x60) >> 5);
int code = spriteram[offs + 1] + ((attr & 0x10) << 4);
int color = attr & 0x0f;
int flipx = 0;
int flipy = attr & 0x80;
int sx = spriteram[offs + 3] - 8;
int sy = 247 - spriteram[offs];
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap, cliprect, machine.gfx[bank], code, color, flipx, flipy, sx, sy, 0);
}
}
static void kchampvs_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
kchamp_state *state = machine.driver_data<kchamp_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = 0; offs < 0x100; offs += 4)
{
int attr = spriteram[offs + 2];
int bank = 1 + ((attr & 0x60) >> 5);
int code = spriteram[offs + 1] + ((attr & 0x10) << 4);
int color = attr & 0x0f;
int flipx = 0;
int flipy = attr & 0x80;
int sx = spriteram[offs + 3];
int sy = 240 - spriteram[offs];
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap, cliprect, machine.gfx[bank], code, color, flipx, flipy, sx, sy, 0);
}
}
SCREEN_UPDATE( kchamp )
{
kchamp_state *state = screen->machine().driver_data<kchamp_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
kchamp_draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}
SCREEN_UPDATE( kchampvs )
{
kchamp_state *state = screen->machine().driver_data<kchamp_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
kchampvs_draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}