summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/video/gamecom.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mess/video/gamecom.c')
-rw-r--r--src/mess/video/gamecom.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/src/mess/video/gamecom.c b/src/mess/video/gamecom.c
new file mode 100644
index 00000000000..ef903c07490
--- /dev/null
+++ b/src/mess/video/gamecom.c
@@ -0,0 +1,72 @@
+
+#include "includes/gamecom.h"
+
+#define Y_PIXELS 200
+
+
+static TIMER_CALLBACK( gamecom_scanline )
+ {
+ gamecom_state *state = machine.driver_data<gamecom_state>();
+ // draw line
+ if ( state->m_scanline == 0 )
+ state->m_base_address = ( state->m_p_ram[SM8521_LCDC] & 0x40 ) ? 0x2000 : 0x0000;
+
+ if ( ~state->m_p_ram[SM8521_LCDC] & 0x80 )
+ {
+ rectangle rec(0, Y_PIXELS - 1, state->m_scanline, state->m_scanline);
+ state->m_bitmap.fill(0, rec );
+ return;
+ }
+ else
+ {
+ UINT8 *line = &state->m_p_videoram[ state->m_base_address + 40 * state->m_scanline ];
+ int pal[4];
+ int i;
+
+ switch( state->m_p_ram[SM8521_LCDC] & 0x30 )
+ {
+ case 0x00:
+ pal[0] = 4;
+ pal[1] = 3;
+ pal[2] = 2;
+ pal[3] = 0;
+ break;
+ case 0x10:
+ pal[0] = 4;
+ pal[1] = 3;
+ pal[2] = 1;
+ pal[3] = 0;
+ break;
+ case 0x20:
+ pal[0] = 4;
+ pal[1] = 3;
+ pal[2] = 1;
+ pal[3] = 0;
+ break;
+ case 0x30:
+ pal[0] = 4;
+ pal[1] = 2;
+ pal[2] = 1;
+ pal[3] = 0;
+ break;
+ }
+ for( i = 0; i < 40; i++ )
+ {
+ UINT8 p = line[i];
+ state->m_bitmap.pix16(i * 4 + 0, state->m_scanline) = pal[ ( p >> 6 ) & 3 ];
+ state->m_bitmap.pix16(i * 4 + 1, state->m_scanline) = pal[ ( p >> 4 ) & 3 ];
+ state->m_bitmap.pix16(i * 4 + 2, state->m_scanline) = pal[ ( p >> 2 ) & 3 ];
+ state->m_bitmap.pix16(i * 4 + 3, state->m_scanline) = pal[ ( p ) & 3 ];
+ }
+ }
+
+ state->m_scanline = ( state->m_scanline + 1 ) % Y_PIXELS;
+}
+
+VIDEO_START( gamecom )
+{
+ gamecom_state *state = machine.driver_data<gamecom_state>();
+ state->m_scanline_timer = machine.scheduler().timer_alloc(FUNC(gamecom_scanline));
+ state->m_scanline_timer->adjust( machine.primary_screen->time_until_pos(0 ), 0, machine.primary_screen->scan_period() );
+ machine.primary_screen->register_screen_bitmap(state->m_bitmap);
+}