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-rw-r--r--src/mess/video/advision.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/mess/video/advision.c b/src/mess/video/advision.c
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+++ b/src/mess/video/advision.c
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+/***************************************************************************
+
+ 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.
+
+***************************************************************************/
+
+PALETTE_INIT( advision )
+{
+ 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;
+}