/*************************************************************************** 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 = auto_alloc_array(machine(), UINT8, 8 * 8 * 256); memset(m_display, 0, 8 * 8 * 256); } /*************************************************************************** Initialise the palette. ***************************************************************************/ void advision_state::palette_init() { int i; for( i = 0; i < 8; i++ ) { /* 8 shades of RED */ palette_set_color_rgb(machine(), 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]; int y; for( y = 0; y < 8; y++ ) { UINT8 data = m_led_latch[7-y]; if( (data & 0x80) == 0 ) dst[0 * 256] = 8; if( (data & 0x40) == 0 ) dst[1 * 256] = 8; if( (data & 0x20) == 0 ) dst[2 * 256] = 8; if( (data & 0x10) == 0 ) dst[3 * 256] = 8; if( (data & 0x08) == 0 ) dst[4 * 256] = 8; if( (data & 0x04) == 0 ) dst[5 * 256] = 8; if( (data & 0x02) == 0 ) dst[6 * 256] = 8; if( (data & 0x01) == 0 ) dst[7 * 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) { int x, y; if( (m_frame_count++ % 4) == 0 ) { m_frame_start = 1; m_video_hpos = 0; } for (x = 0; x < 150; x++) { UINT8 *led = &m_display[x]; for( 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; }