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// license:BSD-3-Clause
// copyright-holders:Mike Balfour
/***************************************************************************
Atari Sprint 2 video emulation
***************************************************************************/
#include "emu.h"
#include "includes/sprint2.h"
void sprint2_state::palette(palette_device &palette) const
{
palette.set_indirect_color(0, rgb_t(0x00, 0x00, 0x00));
palette.set_indirect_color(1, rgb_t(0x5b, 0x5b, 0x5b));
palette.set_indirect_color(2, rgb_t(0xa4, 0xa4, 0xa4));
palette.set_indirect_color(3, rgb_t(0xff, 0xff, 0xff));
palette.set_pen_indirect(0x0, 1); // black playfield
palette.set_pen_indirect(0x1, 0);
palette.set_pen_indirect(0x2, 1); // white playfield
palette.set_pen_indirect(0x3, 3);
palette.set_pen_indirect(0x4, 1); // car #1
palette.set_pen_indirect(0x5, 3);
palette.set_pen_indirect(0x6, 1); // car #2
palette.set_pen_indirect(0x7, 0);
palette.set_pen_indirect(0x8, 1); // car #3
palette.set_pen_indirect(0x9, 2);
palette.set_pen_indirect(0xa, 1); // car #4
palette.set_pen_indirect(0xb, 2);
}
TILE_GET_INFO_MEMBER(sprint2_state::get_tile_info)
{
uint8_t code = m_video_ram[tile_index];
tileinfo.set(0, code & 0x3f, code >> 7, 0);
}
void sprint2_state::video_start()
{
m_screen->register_screen_bitmap(m_helper);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(sprint2_state::get_tile_info)), TILEMAP_SCAN_ROWS, 16, 8, 32, 32);
}
void sprint2_state::video_ram_w(offs_t offset, uint8_t data)
{
m_video_ram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
uint8_t sprint2_state::collision_check(rectangle& rect)
{
uint8_t data = 0;
for (int y = rect.top(); y <= rect.bottom(); y++)
for (int x = rect.left(); x <= rect.right(); x++)
{
uint16_t const a = m_palette->pen_indirect(m_helper.pix(y, x));
if (a == 0)
data |= 0x40;
if (a == 3)
data |= 0x80;
}
return data;
}
inline int sprint2_state::get_sprite_code(int n)
{
return m_video_ram[0x398 + 2 * n + 1] >> 3;
}
inline int sprint2_state::get_sprite_x(int n)
{
return 2 * (248 - m_video_ram[0x390 + 1 * n]);
}
inline int sprint2_state::get_sprite_y(int n)
{
return 1 * (248 - m_video_ram[0x398 + 2 * n]);
}
uint32_t sprint2_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(*m_screen, bitmap, cliprect, 0, 0);
// draw the sprites
for (int i = 0; i < 4; i++)
{
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
get_sprite_code(i),
i,
0, 0,
get_sprite_x(i),
get_sprite_y(i), 0);
}
return 0;
}
WRITE_LINE_MEMBER(sprint2_state::screen_vblank)
{
// rising edge
if (state)
{
const rectangle &visarea = m_screen->visible_area();
/*
* Collisions are detected for both player cars:
*
* D7 => m_collision w/ white playfield
* D6 => m_collision w/ black playfield or another car
*
*/
for (int i = 0; i < 2; i++)
{
rectangle rect(
get_sprite_x(i),
get_sprite_x(i) + m_gfxdecode->gfx(1)->width() - 1,
get_sprite_y(i),
get_sprite_y(i) + m_gfxdecode->gfx(1)->height() - 1);
rect &= visarea;
// check for sprite-tilemap collisions
m_bg_tilemap->draw(*m_screen, m_helper, rect, 0, 0);
m_gfxdecode->gfx(1)->transpen(m_helper,rect,
get_sprite_code(i),
0,
0, 0,
get_sprite_x(i),
get_sprite_y(i), 1);
m_collision[i] |= collision_check(rect);
// check for sprite-sprite collisions
for (int j = 0; j < 4; j++)
if (j != i)
{
m_gfxdecode->gfx(1)->transpen(m_helper,rect,
get_sprite_code(j),
1,
0, 0,
get_sprite_x(j),
get_sprite_y(j), 0);
}
m_gfxdecode->gfx(1)->transpen(m_helper,rect,
get_sprite_code(i),
0,
0, 0,
get_sprite_x(i),
get_sprite_y(i), 1);
m_collision[i] |= collision_check(rect);
}
}
}
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