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// license:BSD-3-Clause
// copyright-holders:Chris Hardy
/***************************************************************************

  hyperspt.cpp

  Functions to emulate the video hardware of the machine.

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

#include "emu.h"
#include "video/resnet.h"
#include "includes/hyperspt.h"

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

  Convert the color PROMs into a more useable format.

  Hyper Sports has one 32x8 palette PROM and two 256x4 lookup table PROMs
  (one for characters, one for sprites).
  The palette PROM is connected to the RGB output this way:

  bit 7 -- 220 ohm resistor  -- BLUE
        -- 470 ohm resistor  -- BLUE
        -- 220 ohm resistor  -- GREEN
        -- 470 ohm resistor  -- GREEN
        -- 1  kohm resistor  -- GREEN
        -- 220 ohm resistor  -- RED
        -- 470 ohm resistor  -- RED
  bit 0 -- 1  kohm resistor  -- RED

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

void hyperspt_state::hyperspt_palette(palette_device &palette) const
{
	const uint8_t *color_prom = memregion("proms")->base();
	static constexpr int resistances_rg[3] = { 1000, 470, 220 };
	static constexpr int resistances_b[2] = { 470, 220 };

	// compute the color output resistor weights
	double rweights[3], gweights[3], bweights[2];
	compute_resistor_weights(0, 255, -1.0,
			3, &resistances_rg[0], rweights, 1000, 0,
			3, &resistances_rg[0], gweights, 1000, 0,
			2, &resistances_b[0],  bweights, 1000, 0);

	// create a lookup table for the palette
	for (int i = 0; i < 0x20; i++)
	{
		int bit0, bit1, bit2;

		// red component
		bit0 = BIT(color_prom[i], 0);
		bit1 = BIT(color_prom[i], 1);
		bit2 = BIT(color_prom[i], 2);
		int const r = combine_weights(rweights, bit0, bit1, bit2);

		// green component
		bit0 = BIT(color_prom[i], 3);
		bit1 = BIT(color_prom[i], 4);
		bit2 = BIT(color_prom[i], 5);
		int const g = combine_weights(gweights, bit0, bit1, bit2);

		// blue component
		bit0 = BIT(color_prom[i], 6);
		bit1 = BIT(color_prom[i], 7);
		int const b = combine_weights(bweights, bit0, bit1);

		palette.set_indirect_color(i, rgb_t(r, g, b));
	}

	// color_prom now points to the beginning of the lookup table
	color_prom += 0x20;

	// sprites
	for (int i = 0; i < 0x100; i++)
	{
		uint8_t const ctabentry = color_prom[i] & 0x0f;
		palette.set_pen_indirect(i, ctabentry);
	}

	// characters
	for (int i = 0x100; i < 0x200; i++)
	{
		uint8_t const ctabentry = (color_prom[i] & 0x0f) | 0x10;
		palette.set_pen_indirect(i, ctabentry);
	}
}

WRITE8_MEMBER(hyperspt_state::videoram_w)
{
	m_videoram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset);
}

WRITE8_MEMBER(hyperspt_state::colorram_w)
{
	m_colorram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset);
}

WRITE_LINE_MEMBER(hyperspt_state::flipscreen_w)
{
	flip_screen_set(state);
	machine().tilemap().mark_all_dirty();
}

TILE_GET_INFO_MEMBER(hyperspt_state::get_bg_tile_info)
{
	int code = m_videoram[tile_index] + ((m_colorram[tile_index] & 0x80) << 1) + ((m_colorram[tile_index] & 0x40) << 3);
	int color = m_colorram[tile_index] & 0x0f;
	int flags = ((m_colorram[tile_index] & 0x10) ? TILE_FLIPX : 0) | ((m_colorram[tile_index] & 0x20) ? TILE_FLIPY : 0);

	SET_TILE_INFO_MEMBER(1, code, color, flags);
}

void hyperspt_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(hyperspt_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
	m_bg_tilemap->set_scroll_rows(32);
}

void hyperspt_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	for (int offs = m_spriteram.bytes() - 4;offs >= 0;offs -= 4)
	{
		int sx = m_spriteram[offs + 3];
		int sy = 240 - m_spriteram[offs + 1];
		int code = m_spriteram[offs + 2] + 8 * (m_spriteram[offs] & 0x20);
		int color = m_spriteram[offs] & 0x0f;
		int flipx = ~m_spriteram[offs] & 0x40;
		int flipy = m_spriteram[offs] & 0x80;

		if (flip_screen())
		{
			sy = 240 - sy;
			flipy = !flipy;
		}

		/* Note that this adjustment must be done AFTER handling flip_screen(), thus */
		/* proving that this is a hardware related "feature" */

		sy += 1;


			m_gfxdecode->gfx(0)->transmask(bitmap,cliprect,
			code, color,
			flipx, flipy,
			sx, sy,
			m_palette->transpen_mask(*m_gfxdecode->gfx(0), color, 0));

		/* redraw with wraparound */


			m_gfxdecode->gfx(0)->transmask(bitmap,cliprect,
			code, color,
			flipx, flipy,
			sx - 256, sy,
			m_palette->transpen_mask(*m_gfxdecode->gfx(0), color, 0));
	}
}

uint32_t hyperspt_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	for (int row = 0; row < 32; row++)
	{
		int scrollx = m_scroll[row * 2] + (m_scroll[(row * 2) + 1] & 0x01) * 256;
		if (flip_screen()) scrollx = -scrollx;
		m_bg_tilemap->set_scrollx(row, scrollx);
	}

	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
	draw_sprites(bitmap, cliprect);
	return 0;
}

/* Road Fighter */
TILE_GET_INFO_MEMBER(hyperspt_state::roadf_get_bg_tile_info)
{
	int code = m_videoram[tile_index] + ((m_colorram[tile_index] & 0x80) << 1) + ((m_colorram[tile_index] & 0x60) << 4);
	int color = m_colorram[tile_index] & 0x0f;
	int flags = (m_colorram[tile_index] & 0x10) ? TILE_FLIPX : 0;

	SET_TILE_INFO_MEMBER(1, code, color, flags);
}

VIDEO_START_MEMBER(hyperspt_state,roadf)
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(hyperspt_state::roadf_get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
	m_bg_tilemap->set_scroll_rows(32);
}