// license:BSD-3-Clause // copyright-holders:Nathan Woods /*************************************************************************** video/advision.c Routines to control the Adventurevision video hardware Video hardware is composed of a vertical array of 40 LEDs which is reflected off a spinning mirror, to give a resolution of 150 x 40 at 15 FPS. ***************************************************************************/ #include "emu.h" #include "includes/advision.h" /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void advision_state::video_start() { m_video_hpos = 0; m_display.resize(8 * 8 * 256); memset(&m_display[0], 0, 8*8*256); save_item(NAME(m_display)); save_item(NAME(m_video_hpos)); } /*************************************************************************** Initialise the palette. ***************************************************************************/ PALETTE_INIT_MEMBER(advision_state, advision) { for (int i = 0; i < 8; i++) { /* 8 shades of RED */ m_palette->set_pen_color(i, i * 0x22, 0x00, 0x00); } } /*************************************************************************** Update the display data. ***************************************************************************/ void advision_state::vh_write(int data) { if (m_video_bank >= 1 && m_video_bank <=5) { m_led_latch[m_video_bank] = data; } } void advision_state::vh_update(int x) { UINT8 *dst = &m_display[x]; for (int y = 0; y < 8; y++) { UINT8 data = m_led_latch[7 - y]; for (int i = 0; i < 8; i++) { if (!BIT(data, 7 - i)) dst[i * 256] = 8; } m_led_latch[7 - y] = 0xff; dst += 8 * 256; } } /*************************************************************************** Refresh the video screen ***************************************************************************/ UINT32 advision_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { if ((m_frame_count++ % 4) == 0) { m_frame_start = 1; m_video_hpos = 0; } for (int x = 0; x < 150; x++) { UINT8 *led = &m_display[x]; for (int y = 0; y < 128; y+=2) { if (*led > 0) bitmap.pix16(30 + y, 85 + x) = --(*led); else bitmap.pix16(30 + y, 85 + x) = 0; led += 256; } } return 0; }