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-rw-r--r--src/mame/video/advision.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/mame/video/advision.c b/src/mame/video/advision.c
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+++ b/src/mame/video/advision.c
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+// 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;
+}