/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/superqix.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static TILE_GET_INFO( pb_get_bg_tile_info )
{
superqix_state *state = machine.driver_data<superqix_state>();
int attr = state->m_videoram[tile_index + 0x400];
int code = state->m_videoram[tile_index] + 256 * (attr & 0x7);
int color = (attr & 0xf0) >> 4;
SET_TILE_INFO(0, code, color, 0);
}
static TILE_GET_INFO( sqix_get_bg_tile_info )
{
superqix_state *state = machine.driver_data<superqix_state>();
int attr = state->m_videoram[tile_index + 0x400];
int bank = (attr & 0x04) ? 0 : 1;
int code = state->m_videoram[tile_index] + 256 * (attr & 0x03);
int color = (attr & 0xf0) >> 4;
if (bank) code += 1024 * state->m_gfxbank;
SET_TILE_INFO(bank, code, color, 0);
tileinfo->group = (attr & 0x08) >> 3;
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( pbillian )
{
superqix_state *state = machine.driver_data<superqix_state>();
state->m_bg_tilemap = tilemap_create(machine, pb_get_bg_tile_info, tilemap_scan_rows, 8, 8,32,32);
}
VIDEO_START( superqix )
{
superqix_state *state = machine.driver_data<superqix_state>();
state->m_fg_bitmap[0] = auto_bitmap_alloc(machine, 256, 256, machine.primary_screen->format());
state->m_fg_bitmap[1] = auto_bitmap_alloc(machine, 256, 256, machine.primary_screen->format());
state->m_bg_tilemap = tilemap_create(machine, sqix_get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
tilemap_set_transmask(state->m_bg_tilemap,0,0xffff,0x0000); /* split type 0 is totally transparent in front half */
tilemap_set_transmask(state->m_bg_tilemap,1,0x0001,0xfffe); /* split type 1 has pen 0 transparent in front half */
state->save_item(NAME(state->m_gfxbank));
state->save_item(NAME(state->m_show_bitmap));
state->save_item(NAME(*state->m_fg_bitmap[0]));
state->save_item(NAME(*state->m_fg_bitmap[1]));
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_HANDLER( superqix_videoram_w )
{
superqix_state *state = space->machine().driver_data<superqix_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset & 0x3ff);
}
WRITE8_HANDLER( superqix_bitmapram_w )
{
superqix_state *state = space->machine().driver_data<superqix_state>();
if (state->m_bitmapram[offset] != data)
{
int x = 2 * (offset % 128);
int y = offset / 128 + 16;
state->m_bitmapram[offset] = data;
*BITMAP_ADDR16(state->m_fg_bitmap[0], y, x) = data >> 4;
*BITMAP_ADDR16(state->m_fg_bitmap[0], y, x + 1) = data & 0x0f;
}
}
WRITE8_HANDLER( superqix_bitmapram2_w )
{
superqix_state *state = space->machine().driver_data<superqix_state>();
if (data != state->m_bitmapram2[offset])
{
int x = 2 * (offset % 128);
int y = offset / 128 + 16;
state->m_bitmapram2[offset] = data;
*BITMAP_ADDR16(state->m_fg_bitmap[1], y, x) = data >> 4;
*BITMAP_ADDR16(state->m_fg_bitmap[1], y, x + 1) = data & 0x0f;
}
}
WRITE8_HANDLER( pbillian_0410_w )
{
/*
-------0 ? [not used]
------1- coin counter 1
-----2-- coin counter 2
----3--- rom 2 HI (reserved for ROM banking , not used)
---4---- nmi enable/disable
--5----- flip screen
*/
coin_counter_w(space->machine(), 0,data & 0x02);
coin_counter_w(space->machine(), 1,data & 0x04);
memory_set_bank(space->machine(), "bank1", (data & 0x08) >> 3);
interrupt_enable_w(space,0,data & 0x10);
flip_screen_set(space->machine(), data & 0x20);
}
WRITE8_HANDLER( superqix_0410_w )
{
superqix_state *state = space->machine().driver_data<superqix_state>();
/* bits 0-1 select the tile bank */
if (state->m_gfxbank != (data & 0x03))
{
state->m_gfxbank = data & 0x03;
tilemap_mark_all_tiles_dirty(state->m_bg_tilemap);
}
/* bit 2 selects which of the two bitmaps to display (for 2 players game) */
state->m_show_bitmap = (data & 0x04) >> 2;
/* bit 3 enables NMI */
interrupt_enable_w(space,offset,data & 0x08);
/* bits 4-5 control ROM bank */
memory_set_bank(space->machine(), "bank1", (data & 0x30) >> 4);
}
/***************************************************************************
Display refresh
***************************************************************************/
static void pbillian_draw_sprites(running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
superqix_state *state = machine.driver_data<superqix_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = 0; offs < state->m_spriteram_size; offs += 4)
{
int attr = spriteram[offs + 3];
int code = ((spriteram[offs] & 0xfc) >> 2) + 64 * (attr & 0x0f);
int color = (attr & 0xf0) >> 4;
int sx = spriteram[offs + 1] + 256 * (spriteram[offs] & 0x01);
int sy = spriteram[offs + 2];
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
}
drawgfx_transpen(bitmap,cliprect, machine.gfx[1],
code,
color,
flip_screen_get(machine), flip_screen_get(machine),
sx, sy, 0);
}
}
static void superqix_draw_sprites(running_machine &machine, bitmap_t *bitmap,const rectangle *cliprect)
{
superqix_state *state = machine.driver_data<superqix_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = 0; offs < state->m_spriteram_size; offs += 4)
{
int attr = spriteram[offs + 3];
int code = spriteram[offs] + 256 * (attr & 0x01);
int color = (attr & 0xf0) >> 4;
int flipx = attr & 0x04;
int flipy = attr & 0x08;
int sx = spriteram[offs + 1];
int sy = spriteram[offs + 2];
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap,cliprect, machine.gfx[2],
code,
color,
flipx, flipy,
sx, sy, 0);
}
}
SCREEN_UPDATE( pbillian )
{
superqix_state *state = screen->machine().driver_data<superqix_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
pbillian_draw_sprites(screen->machine(), bitmap,cliprect);
return 0;
}
SCREEN_UPDATE( superqix )
{
superqix_state *state = screen->machine().driver_data<superqix_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, TILEMAP_DRAW_LAYER1, 0);
copybitmap_trans(bitmap,state->m_fg_bitmap[state->m_show_bitmap],flip_screen_get(screen->machine()),flip_screen_get(screen->machine()),0,0,cliprect,0);
superqix_draw_sprites(screen->machine(), bitmap,cliprect);
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, TILEMAP_DRAW_LAYER0, 0);
return 0;
}