// 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" #include /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ void advision_state::video_start() { m_video_hpos = 0; m_display = std::make_unique(8 * 8 * 256); std::fill_n(m_display.get(), 8 * 8 * 256, 0); save_pointer(NAME(m_display), 8 * 8 * 256); save_item(NAME(m_video_hpos)); } /*************************************************************************** Initialise the palette. ***************************************************************************/ void advision_state::advision_palette(palette_device &palette) const { // 8 shades of RED for (int i = 0; i < 8; i++) m_palette->set_pen_color(i, pal3bit(i), 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_t *dst = &m_display[x]; for (int y = 0; y < 8; y++) { uint8_t 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_t 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_t *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; }