summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/usgames.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/video/usgames.c')
-rw-r--r--src/mame/video/usgames.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/mame/video/usgames.c b/src/mame/video/usgames.c
new file mode 100644
index 00000000000..5cb13ffa71c
--- /dev/null
+++ b/src/mame/video/usgames.c
@@ -0,0 +1,74 @@
+#include "driver.h"
+
+UINT8 *usg_videoram,*usg_charram;
+
+
+static tilemap *usg_tilemap;
+
+
+
+PALETTE_INIT(usg)
+{
+ int j;
+
+ for (j = 0;j < 16;j++)
+ {
+ int r = (j & 1) >> 0;
+ int g = (j & 2) >> 1;
+ int b = (j & 4) >> 2;
+ int i = (j & 8) >> 3;
+
+ r = 0xff * r;
+ g = 0x7f * g * (i + 1);
+ b = 0x7f * b * (i + 1);
+
+ palette_set_color(machine,j,MAKE_RGB(r,g,b));
+ }
+
+ for (j = 0;j < 256;j++)
+ {
+ colortable[2*j] = j & 0x0f;
+ colortable[2*j+1] = j >> 4;
+ }
+}
+
+
+
+static TILE_GET_INFO( get_usg_tile_info )
+{
+ int tileno, colour;
+
+ tileno = usg_videoram[tile_index*2];
+ colour = usg_videoram[tile_index*2+1];
+
+ SET_TILE_INFO(0,tileno,colour,0);
+}
+
+VIDEO_START(usg)
+{
+ usg_tilemap = tilemap_create(get_usg_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN, 8, 8,64,32);
+}
+
+
+WRITE8_HANDLER( usg_videoram_w )
+{
+ usg_videoram[offset] = data;
+ tilemap_mark_tile_dirty(usg_tilemap,offset/2);
+}
+
+WRITE8_HANDLER( usg_charram_w )
+{
+ usg_charram[offset] = data;
+
+ decodechar(Machine->gfx[0], offset/8, usg_charram, Machine->drv->gfxdecodeinfo[0].gfxlayout);
+
+ tilemap_mark_all_tiles_dirty(usg_tilemap);
+}
+
+
+
+VIDEO_UPDATE(usg)
+{
+ tilemap_draw(bitmap,cliprect,usg_tilemap,0,0);
+ return 0;
+}