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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/***************************************************************************

  Radius Two Page Display (1280x960?)

  Fsx8000a = DAC data
  Fsx8000e = DAC control
  Fsx00000 = VRAM (offset 0x200, stride 0x1b0)

***************************************************************************/

#include "emu.h"
#include "nubus_radiustpd.h"
#include "screen.h"


#define RADIUSTPD_SCREEN_NAME "tpd_screen"
#define RADIUSTPD_ROM_REGION  "tpd_rom"

#define VRAM_SIZE   (0x40000)   // 256k.  1152x880 1 bit per pixel fits nicely.


ROM_START( radiustpd )
	ROM_REGION(0x8000, RADIUSTPD_ROM_REGION, 0)
	ROM_LOAD( "tpd_v22.bin",  0x0000, 0x8000, CRC(7dc5ed05) SHA1(4abb64e49201e966c17a255a94b670564b229934) )
ROM_END

//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

DEFINE_DEVICE_TYPE(NUBUS_RADIUSTPD, nubus_radiustpd_device, "nb_rtpd", "Radius Two Page Display video card")


//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

MACHINE_CONFIG_START(nubus_radiustpd_device::device_add_mconfig)
	MCFG_SCREEN_ADD( RADIUSTPD_SCREEN_NAME, RASTER)
	MCFG_SCREEN_UPDATE_DEVICE(DEVICE_SELF, nubus_radiustpd_device, screen_update)
	MCFG_SCREEN_SIZE(1280, 960)
	MCFG_SCREEN_REFRESH_RATE(70)
	MCFG_SCREEN_VISIBLE_AREA(0, 1152-1, 0, 880-1)
MACHINE_CONFIG_END

//-------------------------------------------------
//  rom_region - device-specific ROM region
//-------------------------------------------------

const tiny_rom_entry *nubus_radiustpd_device::device_rom_region() const
{
	return ROM_NAME( radiustpd );
}

//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  nubus_radiustpd_device - constructor
//-------------------------------------------------

nubus_radiustpd_device::nubus_radiustpd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	nubus_radiustpd_device(mconfig, NUBUS_RADIUSTPD, tag, owner, clock)
{
	(void)m_toggle;
	(void)&m_colors[0];
}

nubus_radiustpd_device::nubus_radiustpd_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
	device_t(mconfig, type, tag, owner, clock),
	device_video_interface(mconfig, *this),
	device_nubus_card_interface(mconfig, *this),
	m_vram32(nullptr), m_mode(0), m_vbl_disable(0), m_toggle(0), m_count(0), m_clutoffs(0), m_timer(nullptr),
	m_assembled_tag(util::string_format("%s:%s", tag, RADIUSTPD_SCREEN_NAME))
{
	set_screen(m_assembled_tag.c_str());
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void nubus_radiustpd_device::device_start()
{
	uint32_t slotspace;

	install_declaration_rom(this, RADIUSTPD_ROM_REGION, true, true);

	slotspace = get_slotspace();

	printf("[radiustpd %p] slotspace = %x\n", (void *)this, slotspace);

	m_vram.resize(VRAM_SIZE);
	m_vram32 = (uint32_t *)&m_vram[0];

	nubus().install_device(slotspace, slotspace+VRAM_SIZE-1, read32_delegate(FUNC(nubus_radiustpd_device::vram_r), this), write32_delegate(FUNC(nubus_radiustpd_device::vram_w), this));
	nubus().install_device(slotspace+0x900000, slotspace+VRAM_SIZE-1+0x900000, read32_delegate(FUNC(nubus_radiustpd_device::vram_r), this), write32_delegate(FUNC(nubus_radiustpd_device::vram_w), this));
	nubus().install_device(slotspace+0x80000, slotspace+0xeffff, read32_delegate(FUNC(nubus_radiustpd_device::radiustpd_r), this), write32_delegate(FUNC(nubus_radiustpd_device::radiustpd_w), this));
	nubus().install_device(slotspace+0x980000, slotspace+0x9effff, read32_delegate(FUNC(nubus_radiustpd_device::radiustpd_r), this), write32_delegate(FUNC(nubus_radiustpd_device::radiustpd_w), this));

	m_timer = timer_alloc(0, nullptr);
	m_timer->adjust(screen().time_until_pos(479, 0), 0);
}

//-------------------------------------------------
//  device_reset - device-specific reset
//-------------------------------------------------

void nubus_radiustpd_device::device_reset()
{
	m_count = 0;
	m_clutoffs = 0;
	m_vbl_disable = 1;
	m_mode = 0;
	memset(&m_vram[0], 0, VRAM_SIZE);
	memset(m_palette, 0, sizeof(m_palette));

	m_palette[1] = rgb_t(255, 255, 255);
	m_palette[0] = rgb_t(0, 0, 0);
}


void nubus_radiustpd_device::device_timer(emu_timer &timer, device_timer_id tid, int param, void *ptr)
{
	if (!m_vbl_disable)
	{
		raise_slot_irq();
	}

	m_timer->adjust(screen().time_until_pos(479, 0), 0);
}

/***************************************************************************

  Two Page Display section

***************************************************************************/

uint32_t nubus_radiustpd_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
	uint32_t *scanline;
	int x, y;
	uint8_t pixels, *vram;

	vram = &m_vram[0x200];

	for (y = 0; y < 880; y++)
	{
		scanline = &bitmap.pix32(y);
		for (x = 0; x < 1152/8; x++)
		{
			pixels = vram[(y * (1152/8)) + (BYTE4_XOR_BE(x))];

			*scanline++ = m_palette[((pixels>>7)&0x1)];
			*scanline++ = m_palette[((pixels>>6)&0x1)];
			*scanline++ = m_palette[((pixels>>5)&0x1)];
			*scanline++ = m_palette[((pixels>>4)&0x1)];
			*scanline++ = m_palette[((pixels>>3)&0x1)];
			*scanline++ = m_palette[((pixels>>2)&0x1)];
			*scanline++ = m_palette[((pixels>>1)&0x1)];
			*scanline++ = m_palette[(pixels&1)];
		}
	}

	return 0;
}

WRITE32_MEMBER( nubus_radiustpd_device::radiustpd_w )
{
//  printf("TPD: write %08x to %x, mask %08x\n", data, offset, mem_mask);
}

READ32_MEMBER( nubus_radiustpd_device::radiustpd_r )
{
//  printf("TPD: read @ %x, mask %08x\n", offset, mem_mask);

	if (offset == 0)
	{
		lower_slot_irq();
		m_vbl_disable = true;
	}

	if (offset == 0x8000)
	{
		m_vbl_disable = false;
	}

	if (offset == 0x18000)
	{
		return 0xffffffff;
	}

	return 0;
}

WRITE32_MEMBER( nubus_radiustpd_device::vram_w )
{
	data ^= 0xffffffff;
	COMBINE_DATA(&m_vram32[offset]);
}

READ32_MEMBER( nubus_radiustpd_device::vram_r )
{
	return m_vram32[offset] ^ 0xffffffff;
}