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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#include "emu.h"
#include "wpc_dmd.h"
#include "rendlay.h"
#include "screen.h"

DEFINE_DEVICE_TYPE(WPC_DMD, wpc_dmd_device, "wpc_dmd", "Williams Pinball Controller Dot Matrix Display")

void wpc_dmd_device::registers(address_map &map)
{
	map(0, 0).w(this, FUNC(wpc_dmd_device::bank2_w));
	map(1, 1).w(this, FUNC(wpc_dmd_device::bank0_w));
	map(2, 2).w(this, FUNC(wpc_dmd_device::bank6_w));
	map(3, 3).w(this, FUNC(wpc_dmd_device::bank4_w));
	map(4, 4).w(this, FUNC(wpc_dmd_device::banka_w));
	map(5, 5).w(this, FUNC(wpc_dmd_device::firq_scanline_w));
	map(6, 6).w(this, FUNC(wpc_dmd_device::bank8_w));
	map(7, 7).w(this, FUNC(wpc_dmd_device::visible_page_w));
}


wpc_dmd_device::wpc_dmd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, WPC_DMD, tag, owner, clock),
	scanline_cb(*this),
	dmd0(*this, ":dmd0"),
	dmd2(*this, ":dmd2"),
	dmd4(*this, ":dmd4"),
	dmd6(*this, ":dmd6"),
	dmd8(*this, ":dmd8"),
	dmda(*this, ":dmda")
{
}

wpc_dmd_device::~wpc_dmd_device()
{
}

MACHINE_CONFIG_START(wpc_dmd_device::device_add_mconfig)
	MCFG_SCREEN_ADD("screen", LCD)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
	MCFG_SCREEN_UPDATE_DEVICE(DEVICE_SELF, wpc_dmd_device, screen_update)
	MCFG_SCREEN_SIZE(128*4, 32*4)
	MCFG_SCREEN_VISIBLE_AREA(0, 128*4-1, 0, 32*4-1)
	MCFG_DEFAULT_LAYOUT(layout_lcd)

	MCFG_TIMER_DRIVER_ADD_PERIODIC("scanline", wpc_dmd_device, scanline_timer, attotime::from_hz(60*4*32))
MACHINE_CONFIG_END

void wpc_dmd_device::device_start()
{
	scanline_cb.resolve_safe();

	ram.resize(0x2000);
	screen_buffer.resize(128*32);
	bitcounts.resize(256);

	dmd0->configure_entries(0, 0x10, &ram[0], 0x200);
	dmd2->configure_entries(0, 0x10, &ram[0], 0x200);
	dmd4->configure_entries(0, 0x10, &ram[0], 0x200);
	dmd6->configure_entries(0, 0x10, &ram[0], 0x200);
	dmd8->configure_entries(0, 0x10, &ram[0], 0x200);
	dmda->configure_entries(0, 0x10, &ram[0], 0x200);

	memset(&ram[0], 0x00, 0x2000);

	for(int i=0; i<256; i++) {
		int bc = i;
		bc = ((bc & 0xaa) >> 1) + (bc & 0x55);
		bc = ((bc & 0xcc) >> 2) + (bc & 0x33);
		bc = ((bc & 0xf0) >> 4) + (bc & 0x0f);
		bitcounts[i] = bc;
	}

	save_item(NAME(visible_page));
	save_item(NAME(cur_scanline));
	save_item(NAME(firq_scanline));
	save_item(NAME(ram));
	save_item(NAME(screen_buffer));
	save_item(NAME(bitcounts));
}

void wpc_dmd_device::device_reset()
{
	dmd0->set_entry(0);
	dmd2->set_entry(1);
	dmd4->set_entry(2);
	dmd6->set_entry(3);
	dmd8->set_entry(4);
	dmda->set_entry(5);

	memset(&screen_buffer[0], 0x00, 128*32);
	visible_page = 0;
	firq_scanline = 0;
	cur_scanline = 0;
}

uint32_t wpc_dmd_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	const uint8_t *src = &screen_buffer[0];
	for(int y=0; y<32; y++) {
		uint32_t *pix0 = reinterpret_cast<uint32_t *>(bitmap.raw_pixptr(y*4));
		uint32_t *pix1 = reinterpret_cast<uint32_t *>(bitmap.raw_pixptr(y*4+1));
		uint32_t *pix2 = reinterpret_cast<uint32_t *>(bitmap.raw_pixptr(y*4+2));
		uint32_t *pix3 = reinterpret_cast<uint32_t *>(bitmap.raw_pixptr(y*4+3));
		for(int x=0; x<128; x++) {
			uint8_t v = bitcounts[*src++ & 0x3f];
			uint8_t v0 = v < 2 ? 0 : v-2;
			uint8_t v1 = v < 1 ? 0 : v-1;
			uint8_t v2 = v > 5 ? 5 : v;
			v0 = 255*v0/5;
			v1 = 255*v1/5;
			v2 = 255*v2/5;

			uint32_t xv0 = (v0 << 16) | (v0 << 8);
			uint32_t xv1 = (v1 << 16) | (v1 << 8);
			uint32_t xv2 = (v2 << 16) | (v2 << 8);
			*pix0++ = xv0;
			*pix0++ = xv1;
			*pix0++ = xv1;
			*pix0++ = xv0;

			*pix1++ = xv1;
			*pix1++ = xv2;
			*pix1++ = xv2;
			*pix1++ = xv1;

			*pix2++ = xv1;
			*pix2++ = xv2;
			*pix2++ = xv2;
			*pix2++ = xv1;

			*pix3++ = xv0;
			*pix3++ = xv1;
			*pix3++ = xv1;
			*pix3++ = xv0;
		}
	}
	return 0;
}


TIMER_DEVICE_CALLBACK_MEMBER(wpc_dmd_device::scanline_timer)
{
	const uint8_t *src = &ram[0x200*(visible_page & 0xf) + 16*cur_scanline];
	uint8_t *base = &screen_buffer[128*cur_scanline];

	for(int x1=0; x1<16; x1++) {
		uint8_t v = *src++;
		for(int x2=0; x2<8; x2++) {
			*base = (*base << 1) | ((v & (0x01 << x2)) ? 1 : 0);
			base++;
		}
	}

	cur_scanline = (cur_scanline+1) & 0x1f;
	scanline_cb(cur_scanline == (firq_scanline & 0x1f));
}

WRITE8_MEMBER(wpc_dmd_device::firq_scanline_w)
{
	firq_scanline = data;
}

WRITE8_MEMBER(wpc_dmd_device::bank0_w)
{
	dmd0->set_entry(data & 0xf);
}

WRITE8_MEMBER(wpc_dmd_device::bank2_w)
{
	dmd2->set_entry(data & 0xf);
}

WRITE8_MEMBER(wpc_dmd_device::bank4_w)
{
	dmd4->set_entry(data & 0xf);
}

WRITE8_MEMBER(wpc_dmd_device::bank6_w)
{
	dmd6->set_entry(data & 0xf);
}

WRITE8_MEMBER(wpc_dmd_device::bank8_w)
{
	dmd8->set_entry(data & 0xf);
}

WRITE8_MEMBER(wpc_dmd_device::banka_w)
{
	dmda->set_entry(data & 0xf);
}

WRITE8_MEMBER(wpc_dmd_device::visible_page_w)
{
	visible_page = data;
}