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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Model Racing Dribbling hardware
***************************************************************************/
#include "emu.h"
#include "includes/dribling.h"
/*************************************
*
* Convert the palette PROM into
* a real palette
*
*************************************/
void dribling_state::palette(palette_device &palette) const
{
uint8_t const *const prom = memregion("proms")->base() + 0x400;
for (int i = 0; i < 256; i++)
{
int r = (~prom[i] >> 0) & 1; // 220
int g = (~prom[i] >> 1) & 3; // 820 + 560 (332 max)
int b = (~prom[i] >> 3) & 1; // 220
r *= 0xff;
g *= 0x55;
b *= 0xff;
palette.set_pen_color(i, rgb_t(r, g, b));
}
}
/*************************************
*
* Color control writes
*
*************************************/
void dribling_state::colorram_w(offs_t offset, uint8_t data)
{
// it is very important that we mask off the two bits here
m_colorram[offset & 0x1f9f] = data;
}
/*************************************
*
* Video update routine
*
*************************************/
uint32_t dribling_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
// loop over rows
for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint16_t *const dst = &bitmap.pix(y);
// loop over columns
for (int x = cliprect.min_x; x <= cliprect.max_x; x++)
{
int b7 = m_proms[(x >> 3) | ((y >> 3) << 5)] & 1;
int b6 = m_abca;
int b5 = (x >> 3) & 1;
int b4 = (m_gfxroms[(x >> 3) | (y << 5)] >> (x & 7)) & 1;
int b3 = (m_videoram[(x >> 3) | (y << 5)] >> (x & 7)) & 1;
int b2_0 = m_colorram[(x >> 3) | ((y >> 2) << 7)] & 7;
// assemble the various bits into a palette PROM index
dst[x] = (b7 << 7) | (b6 << 6) | (b5 << 5) | (b4 << 4) | (b3 << 3) | b2_0;
}
}
return 0;
}
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