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// license:BSD-3-Clause
// copyright-holders:Victor Trucco, Mike Balfour, Phil Stroffolino
/* video hardware for Pacific Novelty games:
** Thief/Nato Defense
*/
#include "emu.h"
#include "includes/thief.h"
enum {
IMAGE_ADDR_LO, //0xe000
IMAGE_ADDR_HI, //0xe001
SCREEN_XPOS, //0xe002
SCREEN_YPOS, //0xe003
BLIT_WIDTH, //0xe004
BLIT_HEIGHT, //0xe005
GFX_PORT, //0xe006
BARL_PORT, //0xe007
BLIT_ATTRIBUTES //0xe008
};
/***************************************************************************/
uint8_t thief_state::thief_context_ram_r(offs_t offset){
return m_coprocessor.context_ram[0x40*m_coprocessor.bank+offset];
}
void thief_state::thief_context_ram_w(offs_t offset, uint8_t data){
m_coprocessor.context_ram[0x40*m_coprocessor.bank+offset] = data;
}
void thief_state::thief_context_bank_w(uint8_t data){
m_coprocessor.bank = data&0xf;
}
/***************************************************************************/
void thief_state::thief_video_control_w(uint8_t data){
m_video_control = data;
/*
bit 0: screen flip
bit 1: working page
bit 2: visible page
bit 3: mirrors bit 1
bit 4: mirrors bit 2
*/
}
void thief_state::thief_color_map_w(offs_t offset, uint8_t data){
/*
--xx---- blue
----xx-- green
------xx red
*/
static const uint8_t intensity[4] = {0x00,0x55,0xAA,0xFF};
int r = intensity[(data & 0x03) >> 0];
int g = intensity[(data & 0x0C) >> 2];
int b = intensity[(data & 0x30) >> 4];
m_palette->set_pen_color( offset,rgb_t(r,g,b) );
}
/***************************************************************************/
void thief_state::thief_color_plane_w(uint8_t data){
/*
--xx---- selects bitplane to read from (0..3)
----xxxx selects bitplane(s) to write to (0x0 = none, 0xf = all)
*/
m_write_mask = data&0xf;
m_read_mask = (data>>4)&3;
}
uint8_t thief_state::thief_videoram_r(offs_t offset){
uint8_t *videoram = m_videoram.get();
uint8_t *source = &videoram[offset];
if( m_video_control&0x02 ) source+=0x2000*4; /* foreground/background */
return source[m_read_mask*0x2000];
}
void thief_state::thief_videoram_w(offs_t offset, uint8_t data){
uint8_t *videoram = m_videoram.get();
uint8_t *dest = &videoram[offset];
if( m_video_control&0x02 )
dest+=0x2000*4; /* foreground/background */
if( m_write_mask&0x1 ) dest[0x2000*0] = data;
if( m_write_mask&0x2 ) dest[0x2000*1] = data;
if( m_write_mask&0x4 ) dest[0x2000*2] = data;
if( m_write_mask&0x8 ) dest[0x2000*3] = data;
}
/***************************************************************************/
void thief_state::video_start(){
memset( &m_coprocessor, 0x00, sizeof(m_coprocessor) );
m_videoram = make_unique_clear<uint8_t[]>(0x2000*4*2 );
m_coprocessor.image_ram = std::make_unique<uint8_t[]>(0x2000 );
m_coprocessor.context_ram = std::make_unique<uint8_t[]>(0x400 );
}
uint32_t thief_state::screen_update_thief(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){
int flipscreen = m_video_control&1;
const uint8_t *source = m_videoram.get();
if (m_tms->screen_reset())
{
bitmap.fill(m_palette->black_pen(), cliprect);
return 0;
}
if( m_video_control&4 ) /* visible page */
source += 0x2000*4;
for( uint32_t offs=0; offs<0x2000; offs++ ){
int ypos = offs/32;
int xpos = (offs%32)*8;
int plane0 = source[0x2000*0+offs];
int plane1 = source[0x2000*1+offs];
int plane2 = source[0x2000*2+offs];
int plane3 = source[0x2000*3+offs];
if( flipscreen ){
for( int bit=0; bit<8; bit++ ){
bitmap.pix(0xff - ypos, 0xff - (xpos+bit)) =
(((plane0<<bit)&0x80)>>7) |
(((plane1<<bit)&0x80)>>6) |
(((plane2<<bit)&0x80)>>5) |
(((plane3<<bit)&0x80)>>4);
}
}
else {
for( int bit=0; bit<8; bit++ ){
bitmap.pix(ypos, xpos+bit) =
(((plane0<<bit)&0x80)>>7) |
(((plane1<<bit)&0x80)>>6) |
(((plane2<<bit)&0x80)>>5) |
(((plane3<<bit)&0x80)>>4);
}
}
}
return 0;
}
/***************************************************************************/
uint16_t thief_state::fetch_image_addr( coprocessor_t &thief_coprocessor )
{
int addr = thief_coprocessor.param[IMAGE_ADDR_LO]+256*thief_coprocessor.param[IMAGE_ADDR_HI];
/* auto-increment */
thief_coprocessor.param[IMAGE_ADDR_LO]++;
if( thief_coprocessor.param[IMAGE_ADDR_LO]==0x00 ){
thief_coprocessor.param[IMAGE_ADDR_HI]++;
}
return addr;
}
void thief_state::thief_blit_w(uint8_t data){
coprocessor_t &thief_coprocessor = m_coprocessor;
int i, offs, xoffset, dy;
uint8_t *gfx_rom = memregion( "gfx1" )->base();
uint8_t x = thief_coprocessor.param[SCREEN_XPOS];
uint8_t y = thief_coprocessor.param[SCREEN_YPOS];
uint8_t width = thief_coprocessor.param[BLIT_WIDTH];
uint8_t height = thief_coprocessor.param[BLIT_HEIGHT];
uint8_t attributes = thief_coprocessor.param[BLIT_ATTRIBUTES];
uint8_t old_data;
int xor_blit = data;
/* making the xor behavior selectable fixes score display,
but causes minor glitches on the playfield */
x -= width*8;
xoffset = x&7;
if( attributes&0x10 ){
y += 7-height;
dy = 1;
}
else {
dy = -1;
}
height++;
while( height-- ){
for( i=0; i<=width; i++ ){
int addr = fetch_image_addr(thief_coprocessor);
if( addr<0x2000 ){
data = thief_coprocessor.image_ram[addr];
}
else {
addr -= 0x2000;
if( addr<0x2000*3 ) data = gfx_rom[addr];
}
offs = (y*32+x/8+i)&0x1fff;
old_data = thief_videoram_r(offs);
if( xor_blit ){
thief_videoram_w(offs, old_data^(data>>xoffset));
}
else {
thief_videoram_w(offs,
(old_data&(0xff00>>xoffset)) | (data>>xoffset)
);
}
offs = (offs+1)&0x1fff;
old_data = thief_videoram_r(offs);
if( xor_blit ){
thief_videoram_w(offs, old_data^((data<<(8-xoffset))&0xff));
}
else {
thief_videoram_w(offs,
(old_data&(0xff>>xoffset)) | ((data<<(8-xoffset))&0xff)
);
}
}
y+=dy;
}
}
uint8_t thief_state::thief_coprocessor_r(offs_t offset){
coprocessor_t &thief_coprocessor = m_coprocessor;
switch( offset ){
case SCREEN_XPOS: /* xpos */
case SCREEN_YPOS: /* ypos */
{
/* XLAT: given (x,y) coordinate, return byte address in videoram */
int addr = thief_coprocessor.param[SCREEN_XPOS]+256*thief_coprocessor.param[SCREEN_YPOS];
int result = 0xc000 | (addr>>3);
return (offset==0x03)?(result>>8):(result&0xff);
}
case GFX_PORT:
{
int addr = fetch_image_addr(thief_coprocessor);
if( addr<0x2000 ){
return thief_coprocessor.image_ram[addr];
}
else {
uint8_t *gfx_rom = memregion( "gfx1" )->base();
addr -= 0x2000;
if( addr<0x6000 ) return gfx_rom[addr];
}
}
break;
case BARL_PORT:
{
/* return bitmask for addressed pixel */
int dx = thief_coprocessor.param[SCREEN_XPOS]&0x7;
if( thief_coprocessor.param[BLIT_ATTRIBUTES]&0x01 ){
return 0x01<<dx; // flipx
}
else {
return 0x80>>dx; // no flip
}
}
}
return thief_coprocessor.param[offset];
}
void thief_state::thief_coprocessor_w(offs_t offset, uint8_t data){
coprocessor_t &thief_coprocessor = m_coprocessor;
switch( offset ){
case GFX_PORT:
{
int addr = fetch_image_addr(thief_coprocessor);
if( addr<0x2000 ){
thief_coprocessor.image_ram[addr] = data;
}
}
break;
default:
thief_coprocessor.param[offset] = data;
break;
}
}
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