// license:BSD-3-Clause
// copyright-holders:Zsolt Vasvari
#include "emu.h"
#include "video/resnet.h"
#include "includes/gotya.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
PALETTE_INIT_MEMBER(gotya_state, gotya)
{
const uint8_t *color_prom = memregion("proms")->base();
static const int resistances_rg[3] = { 1000, 470, 220 };
static const int resistances_b [2] = { 470, 220 };
double rweights[3], gweights[3], bweights[2];
int i;
/* compute the color output resistor weights */
compute_resistor_weights(0, 255, -1.0,
3, &resistances_rg[0], rweights, 0, 0,
3, &resistances_rg[0], gweights, 0, 0,
2, &resistances_b[0], bweights, 0, 0);
/* create a lookup table for the palette */
for (i = 0; i < 0x20; i++)
{
int bit0, bit1, bit2;
int r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = combine_3_weights(rweights, bit0, bit1, bit2);
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = combine_3_weights(gweights, bit0, bit1, bit2);
/* blue component */
bit0 = (color_prom[i] >> 6) & 0x01;
bit1 = (color_prom[i] >> 7) & 0x01;
b = combine_2_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 += 32;
for (i = 0; i < 0x40; i++)
{
uint8_t ctabentry = color_prom[i] & 0x07;
palette.set_pen_indirect(i, ctabentry);
}
}
WRITE8_MEMBER(gotya_state::gotya_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(gotya_state::gotya_colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(gotya_state::gotya_video_control_w)
{
/* bit 0 - scroll bit 8
bit 1 - flip screen
bit 2 - sound disable ??? */
m_scroll_bit_8 = data & 0x01;
if (flip_screen() != (data & 0x02))
{
flip_screen_set(data & 0x02);
machine().tilemap().mark_all_dirty();
}
}
TILE_GET_INFO_MEMBER(gotya_state::get_bg_tile_info)
{
int code = m_videoram[tile_index];
int color = m_colorram[tile_index] & 0x0f;
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
TILEMAP_MAPPER_MEMBER(gotya_state::tilemap_scan_rows_thehand)
{
/* logical (col,row) -> memory offset */
row = 31 - row;
col = 63 - col;
return ((row) * (num_cols >> 1)) + (col & 31) + ((col >> 5) * 0x400);
}
void gotya_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(gotya_state::get_bg_tile_info),this), tilemap_mapper_delegate(FUNC(gotya_state::tilemap_scan_rows_thehand),this), 8, 8, 64, 32);
}
void gotya_state::draw_status_row( bitmap_ind16 &bitmap, const rectangle &cliprect, int sx, int col )
{
int row;
if (flip_screen())
{
sx = 35 - sx;
}
for (row = 29; row >= 0; row--)
{
int sy;
if (flip_screen())
sy = row;
else
sy = 31 - row;
m_gfxdecode->gfx(0)->opaque(bitmap,cliprect,
m_videoram2[row * 32 + col],
m_videoram2[row * 32 + col + 0x10] & 0x0f,
flip_screen_x(), flip_screen_y(),
8 * sx, 8 * sy);
}
}
void gotya_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
uint8_t *spriteram = m_spriteram;
int offs;
for (offs = 2; offs < 0x0e; offs += 2)
{
int code = spriteram[offs + 0x01] >> 2;
int color = spriteram[offs + 0x11] & 0x0f;
int sx = 256 - spriteram[offs + 0x10] + (spriteram[offs + 0x01] & 0x01) * 256;
int sy = spriteram[offs + 0x00];
if (flip_screen())
sy = 240 - sy;
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code, color,
flip_screen_x(), flip_screen_y(),
sx, sy, 0);
}
}
void gotya_state::draw_status( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
draw_status_row(bitmap, cliprect, 0, 1);
draw_status_row(bitmap, cliprect, 1, 0);
draw_status_row(bitmap, cliprect, 2, 2); /* these two are blank, but I dont' know if the data comes */
draw_status_row(bitmap, cliprect, 33, 13); /* from RAM or 'hardcoded' into the hardware. Likely the latter */
draw_status_row(bitmap, cliprect, 35, 14);
draw_status_row(bitmap, cliprect, 34, 15);
}
uint32_t gotya_state::screen_update_gotya(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->set_scrollx(0, -(*m_scroll + (m_scroll_bit_8 * 256)) - 2 * 8);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
draw_status(bitmap, cliprect);
return 0;
}