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/***************************************************************************
Atari Canyon Bomber video emulation
***************************************************************************/
#include "emu.h"
#include "includes/canyon.h"
WRITE8_HANDLER( canyon_videoram_w )
{
canyon_state *state = space->machine().driver_data<canyon_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
static TILE_GET_INFO( get_bg_tile_info )
{
canyon_state *state = machine.driver_data<canyon_state>();
UINT8 code = state->m_videoram[tile_index];
SET_TILE_INFO(0, code & 0x3f, code >> 7, 0);
}
VIDEO_START( canyon )
{
canyon_state *state = machine.driver_data<canyon_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
}
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle* cliprect )
{
canyon_state *state = machine.driver_data<canyon_state>();
int i;
for (i = 0; i < 2; i++)
{
int x = state->m_videoram[0x3d0 + 2 * i + 0x1];
int y = state->m_videoram[0x3d0 + 2 * i + 0x8];
int c = state->m_videoram[0x3d0 + 2 * i + 0x9];
drawgfx_transpen(bitmap, cliprect,
machine.gfx[1],
c >> 3,
i,
!(c & 0x80), 0,
224 - x,
240 - y, 0);
}
}
static void draw_bombs( running_machine &machine, bitmap_t *bitmap, const rectangle* cliprect )
{
canyon_state *state = machine.driver_data<canyon_state>();
int i;
for (i = 0; i < 2; i++)
{
int sx = 254 - state->m_videoram[0x3d0 + 2 * i + 0x5];
int sy = 246 - state->m_videoram[0x3d0 + 2 * i + 0xc];
rectangle rect;
rect.min_x = sx;
rect.min_y = sy;
rect.max_x = sx + 1;
rect.max_y = sy + 1;
if (rect.min_x < cliprect->min_x) rect.min_x = cliprect->min_x;
if (rect.min_y < cliprect->min_y) rect.min_y = cliprect->min_y;
if (rect.max_x > cliprect->max_x) rect.max_x = cliprect->max_x;
if (rect.max_y > cliprect->max_y) rect.max_y = cliprect->max_y;
bitmap_fill(bitmap, &rect, 1 + 2 * i);
}
}
SCREEN_UPDATE( canyon )
{
canyon_state *state = screen->machine().driver_data<canyon_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
draw_sprites(screen->machine(), bitmap, cliprect);
draw_bombs(screen->machine(), bitmap, cliprect);
/* watchdog is disabled during service mode */
watchdog_enable(screen->machine(), !(input_port_read(screen->machine(), "IN2") & 0x10));
return 0;
}
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