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/***************************************************************************
Galaxia Video HW
hardware is derived from cvs
***************************************************************************/
#include "emu.h"
#include "video/s2636.h"
#include "includes/galaxia.h"
#define SPRITE_PEN_BASE (0x10)
#define STAR_PEN (0x18)
#define BULLET_PEN (0x19)
// Colors are 1bpp, but how they are generated is a mystery
// there's no color prom on the pcb, nor palette ram
PALETTE_INIT( galaxia )
{
// estimated with video/photo references
const int lut_clr[0x18] = {
// background
0, 1, 4, 5,
0, 3, 6, 2,
0, 1, 4, 5, // unused?
0, 3, 1, 7,
// sprites
0, 4, 3, 6, 1, 5, 2, 7
};
for (int i = 0; i < 0x18; i++)
palette_set_color_rgb(machine, i, pal1bit(lut_clr[i] >> 0), pal1bit(lut_clr[i] >> 1), pal1bit(lut_clr[i] >> 2));
// stars/bullets
palette_set_color_rgb(machine, STAR_PEN, pal1bit(1), pal1bit(1), pal1bit(1));
palette_set_color_rgb(machine, BULLET_PEN, pal1bit(1), pal1bit(1), pal1bit(0));
}
PALETTE_INIT( astrowar )
{
// no reference material available(?), except for Data East astrof
const int lut_clr[8] = { 7, 3, 5, 1, 4, 2, 6, 7 };
for (int i = 0; i < 8; i++)
{
// background
palette_set_color_rgb(machine, i*2, 0, 0, 0);
palette_set_color_rgb(machine, i*2 + 1, pal1bit(lut_clr[i] >> 0), pal1bit(lut_clr[i] >> 1), pal1bit(lut_clr[i] >> 2));
// sprites
palette_set_color_rgb(machine, i | SPRITE_PEN_BASE, pal1bit(i >> 0), pal1bit(i >> 1), pal1bit(i >> 2));
}
// stars/bullets
palette_set_color_rgb(machine, STAR_PEN, pal1bit(1), pal1bit(1), pal1bit(1));
palette_set_color_rgb(machine, BULLET_PEN, pal1bit(1), pal1bit(1), pal1bit(0));
}
static TILE_GET_INFO( get_galaxia_bg_tile_info )
{
galaxia_state *state = machine.driver_data<galaxia_state>();
UINT8 code = state->m_video_ram[tile_index] & 0x7f; // d7 unused
UINT8 color = state->m_color_ram[tile_index] & 3; // highest bits unused
SET_TILE_INFO(0, code, color, 0);
}
static TILE_GET_INFO( get_astrowar_bg_tile_info )
{
galaxia_state *state = machine.driver_data<galaxia_state>();
UINT8 code = state->m_video_ram[tile_index];
UINT8 color = state->m_color_ram[tile_index] & 7; // highest bits unused
SET_TILE_INFO(0, code, color, 0);
}
static void init_common( running_machine &machine )
{
assert((STAR_PEN & 7) == 0);
cvs_init_stars(machine);
}
VIDEO_START( galaxia )
{
galaxia_state *state = machine.driver_data<galaxia_state>();
init_common(machine);
state->m_bg_tilemap = tilemap_create(machine, get_galaxia_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
state->m_bg_tilemap->set_transparent_pen(0);
state->m_bg_tilemap->set_scroll_cols(8);
}
VIDEO_START( astrowar )
{
galaxia_state *state = machine.driver_data<galaxia_state>();
init_common(machine);
state->m_bg_tilemap = tilemap_create(machine, get_astrowar_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
state->m_bg_tilemap->set_transparent_pen(0);
state->m_bg_tilemap->set_scroll_cols(8);
state->m_bg_tilemap->set_scrolldx(8, 8);
machine.primary_screen->register_screen_bitmap(state->m_temp_bitmap);
}
/********************************************************************************/
SCREEN_UPDATE_IND16( galaxia )
{
galaxia_state *state = screen.machine().driver_data<galaxia_state>();
int x, y;
bitmap_ind16 &s2636_0_bitmap = s2636_update(screen.machine().device("s2636_0"), cliprect);
bitmap_ind16 &s2636_1_bitmap = s2636_update(screen.machine().device("s2636_1"), cliprect);
bitmap_ind16 &s2636_2_bitmap = s2636_update(screen.machine().device("s2636_2"), cliprect);
bitmap.fill(0, cliprect);
cvs_update_stars(screen.machine(), bitmap, cliprect, STAR_PEN, 1);
state->m_bg_tilemap->draw(bitmap, cliprect, 0, 0);
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for (x = cliprect.min_x; x <= cliprect.max_x; x++)
{
bool bullet = state->m_bullet_ram[y] && x == (state->m_bullet_ram[y] ^ 0xff);
bool background = (bitmap.pix16(y, x) & 3) != 0;
// draw bullets (guesswork)
if (bullet)
{
// background vs. bullet collision detection
if (background) state->m_collision_register |= 0x80;
// bullet size/color/priority is guessed
bitmap.pix16(y, x) = BULLET_PEN;
if (x) bitmap.pix16(y, x-1) = BULLET_PEN;
}
// copy the S2636 images into the main bitmap and check collision
int pixel0 = s2636_0_bitmap.pix16(y, x);
int pixel1 = s2636_1_bitmap.pix16(y, x);
int pixel2 = s2636_2_bitmap.pix16(y, x);
int pixel = pixel0 | pixel1 | pixel2;
if (S2636_IS_PIXEL_DRAWN(pixel))
{
// S2636 vs. S2636 collision detection
if (S2636_IS_PIXEL_DRAWN(pixel0) && S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision_register |= 0x01;
if (S2636_IS_PIXEL_DRAWN(pixel1) && S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision_register |= 0x02;
if (S2636_IS_PIXEL_DRAWN(pixel2) && S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision_register |= 0x04;
// S2636 vs. bullet collision detection
if (bullet) state->m_collision_register |= 0x08;
// S2636 vs. background collision detection
if (background)
{
/* bit4 causes problems on 2nd level
if (S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision_register |= 0x10; */
if (S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision_register |= 0x20;
if (S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision_register |= 0x40;
}
bitmap.pix16(y, x) = S2636_PIXEL_COLOR(pixel) | SPRITE_PEN_BASE;
}
}
}
return 0;
}
SCREEN_UPDATE_IND16( astrowar )
{
// astrowar has only one S2636
galaxia_state *state = screen.machine().driver_data<galaxia_state>();
int x, y;
bitmap_ind16 &s2636_0_bitmap = s2636_update(screen.machine().device("s2636_0"), cliprect);
bitmap.fill(0, cliprect);
cvs_update_stars(screen.machine(), bitmap, cliprect, STAR_PEN, 1);
state->m_bg_tilemap->draw(bitmap, cliprect, 0, 0);
copybitmap(state->m_temp_bitmap, bitmap, 0, 0, 0, 0, cliprect);
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
// draw bullets (guesswork)
if (state->m_bullet_ram[y])
{
UINT8 pos = state->m_bullet_ram[y] ^ 0xff;
// background vs. bullet collision detection
if (state->m_temp_bitmap.pix16(y, pos) & 1)
state->m_collision_register |= 0x02;
// bullet size/color/priority is guessed
bitmap.pix16(y, pos) = BULLET_PEN;
if (pos) bitmap.pix16(y, pos-1) = BULLET_PEN;
}
for (x = cliprect.min_x; x <= cliprect.max_x; x++)
{
// NOTE: similar to zac2650.c, the sprite chip runs at a different frequency than the background generator
// the exact timing ratio is unknown, so we'll have to do with guesswork
float s_ratio = 256.0 / 196.0;
float sx = x * s_ratio;
if ((int)(sx + 0.5) > cliprect.max_x)
break;
// copy the S2636 bitmap into the main bitmap and check collision
int pixel = s2636_0_bitmap.pix16(y, x);
if (S2636_IS_PIXEL_DRAWN(pixel))
{
// S2636 vs. background collision detection
if ((state->m_temp_bitmap.pix16(y, (int)(sx)) | state->m_temp_bitmap.pix16(y, (int)(sx + 0.5))) & 1)
state->m_collision_register |= 0x01;
bitmap.pix16(y, (int)(sx)) = S2636_PIXEL_COLOR(pixel) | SPRITE_PEN_BASE;
bitmap.pix16(y, (int)(sx + 0.5)) = S2636_PIXEL_COLOR(pixel) | SPRITE_PEN_BASE;
}
}
}
return 0;
}
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