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Diffstat (limited to 'src/mame/video/advision.c')
-rw-r--r-- | src/mame/video/advision.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/mame/video/advision.c b/src/mame/video/advision.c new file mode 100644 index 00000000000..086f61c6175 --- /dev/null +++ b/src/mame/video/advision.c @@ -0,0 +1,110 @@ +// 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; +} |