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// license:GPL-2.0+
// copyright-holders:Juergen Buchmueller, Frank Palazzolo, Sean Riddle
#include "emu.h"
#include "includes/channelf.h"
static constexpr rgb_t channelf_pens[] =
{
{ 0x10, 0x10, 0x10 }, // black
{ 0xfd, 0xfd, 0xfd }, // white
{ 0xff, 0x31, 0x53 }, // red
{ 0x02, 0xcc, 0x5d }, // green
{ 0x4b, 0x3f, 0xf3 }, // blue
{ 0xe0, 0xe0, 0xe0 }, // ltgray
{ 0x91, 0xff, 0xa6 }, // ltgreen
{ 0xce, 0xd0, 0xff } // ltblue
};
#define BLACK 0
#define WHITE 1
#define RED 2
#define GREEN 3
#define BLUE 4
#define LTGRAY 5
#define LTGREEN 6
#define LTBLUE 7
static const uint16_t colormap[] = {
BLACK, WHITE, WHITE, WHITE,
LTBLUE, BLUE, RED, GREEN,
LTGRAY, BLUE, RED, GREEN,
LTGREEN, BLUE, RED, GREEN,
};
/* Initialise the palette */
void channelf_state::channelf_palette(palette_device &palette) const
{
palette.set_pen_colors(0, channelf_pens);
}
void channelf_state::video_start()
{
m_p_videoram = memregion("vram")->base();
}
int channelf_state::recalc_palette_offset(int reg1, int reg2)
{
/* Note: This is based on the decoding they used to */
/* determine which palette this line is using */
return ((reg2&0x2)|(reg1>>1)) << 2;
}
uint32_t channelf_state::screen_update_ntsc(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
return screen_update_channelf(screen, bitmap, cliprect, 4);
}
uint32_t channelf_state::screen_update_pal(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
return screen_update_channelf(screen, bitmap, cliprect, 5);
}
uint32_t channelf_state::screen_update_channelf(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int y_rpt)
{
uint16_t ma=0;
for (uint8_t y = 0; y < 64; y++)
{
int const palette_offset = recalc_palette_offset(m_p_videoram[y*128+125]&3, m_p_videoram[y*128+126]&3);
int y_end_pos = std::min(bitmap.height(), (y * y_rpt) + y_rpt);
for (int y_pos = y * y_rpt; y_pos < y_end_pos; y_pos++)
{
uint16_t *p = &bitmap.pix(y_pos);
for (uint16_t x = ma; x < ma + 128; x++)
{
uint8_t const col = palette_offset+(m_p_videoram[x|(y<<7)]&3);
*p++ = colormap[col];
*p++ = colormap[col];
}
}
ma+=128;
}
return 0;
}
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