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Diffstat (limited to 'src/mame/video/battlane.c')
-rw-r--r--src/mame/video/battlane.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/src/mame/video/battlane.c b/src/mame/video/battlane.c
new file mode 100644
index 00000000000..9c5089a16eb
--- /dev/null
+++ b/src/mame/video/battlane.c
@@ -0,0 +1,250 @@
+/***************************************************************************
+
+ Battle Lane Vol. 5
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT8 *battlane_spriteram;
+UINT8 *battlane_tileram;
+
+static tilemap *bg_tilemap;
+
+static int battlane_video_ctrl;
+extern int battlane_cpu_control;
+
+static mame_bitmap *screen_bitmap;
+
+/*
+ Video control register
+
+ 0x80 = low bit of blue component (taken when writing to palette)
+ 0x0e = Bitmap plane (bank?) select (0-7)
+ 0x01 = Scroll MSB
+*/
+
+WRITE8_HANDLER( battlane_palette_w )
+{
+ int r, g, b;
+ int bit0, bit1, bit2;
+
+ /* red component */
+
+ bit0 = (~data >> 0) & 0x01;
+ bit1 = (~data >> 1) & 0x01;
+ bit2 = (~data >> 2) & 0x01;
+ r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* green component */
+
+ bit0 = (~data >> 3) & 0x01;
+ bit1 = (~data >> 4) & 0x01;
+ bit2 = (~data >> 5) & 0x01;
+ g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* blue component */
+
+ bit0 = (~battlane_video_ctrl >> 7) & 0x01;
+ bit1 = (~data >> 6) & 0x01;
+ bit2 = (~data >> 7) & 0x01;
+ b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ palette_set_color(Machine, offset, MAKE_RGB(r, g, b));
+}
+
+WRITE8_HANDLER( battlane_scrollx_w )
+{
+ tilemap_set_scrollx(bg_tilemap, 0, ((battlane_video_ctrl & 0x01) << 8) + data);
+}
+
+WRITE8_HANDLER( battlane_scrolly_w )
+{
+ tilemap_set_scrolly(bg_tilemap, 0, ((battlane_cpu_control & 0x01) << 8) + data);
+}
+
+WRITE8_HANDLER( battlane_tileram_w )
+{
+ battlane_tileram[offset] = data;
+ //tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( battlane_spriteram_w )
+{
+ battlane_spriteram[offset] = data;
+}
+
+WRITE8_HANDLER( battlane_bitmap_w )
+{
+ int i, orval;
+
+ orval = (~battlane_video_ctrl >> 1) & 0x07;
+
+ if (!orval)
+ orval = 7;
+
+ for (i = 0; i < 8; i++)
+ {
+ if (data & 1 << i)
+ {
+ *BITMAP_ADDR8(screen_bitmap, offset % 0x100, (offset / 0x100) * 8 + i) |= orval;
+ }
+ else
+ {
+ *BITMAP_ADDR8(screen_bitmap, offset % 0x100, (offset / 0x100) * 8 + i) &= ~orval;
+ }
+ }
+}
+
+WRITE8_HANDLER( battlane_video_ctrl_w )
+{
+ battlane_video_ctrl = data;
+}
+
+static TILE_GET_INFO( get_tile_info_bg )
+{
+ int code = battlane_tileram[tile_index];
+ int attr = battlane_tileram[tile_index + 0x400];
+ int gfxn = (attr & 0x01) + 1;
+ int color = (attr >> 1) & 0x03;
+
+ SET_TILE_INFO(gfxn, code, color, 0);
+}
+
+static TILEMAP_MAPPER( battlane_tilemap_scan_rows_2x2 )
+{
+ /*
+ Tilemap Memory Organization
+
+ 0 15 16 31
+ +-----------------+----------------+
+ |0 15|256 |0
+ | | |
+ | screen 0 | screen 1 |
+ | | |
+ |240 255| 511|15
+ +-----------------+----------------+
+ |512 |768 |16
+ | | |
+ | screen 2 | screen 3 |
+ | | |
+ | 767| 1023|31
+ +-----------------+-----------------
+
+ */
+
+ return (row & 0xf) * 16 + (col & 0xf) + (row & 0x10) * 32 + (col & 0x10) * 16;
+}
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+VIDEO_START( battlane )
+{
+ bg_tilemap = tilemap_create(get_tile_info_bg, battlane_tilemap_scan_rows_2x2,
+ TILEMAP_TYPE_PEN, 16, 16, 32, 32);
+
+ screen_bitmap = auto_bitmap_alloc(32 * 8, 32 * 8, BITMAP_FORMAT_INDEXED8);
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs, attr, code, color, sx, sy, flipx, flipy, dy;
+
+ for (offs = 0; offs < 0x100; offs += 4)
+ {
+ /*
+ 0x80 = Bank 2
+ 0x40 =
+ 0x20 = Bank 1
+ 0x10 = Y Double
+ 0x08 = Color
+ 0x04 = X Flip
+ 0x02 = Y Flip
+ 0x01 = Sprite Enable
+ */
+
+ attr = battlane_spriteram[offs + 1];
+ code = battlane_spriteram[offs + 3];
+
+ code += 256 * ((attr >> 6) & 0x02);
+ code += 256 * ((attr >> 5) & 0x01);
+
+ if (attr & 0x01)
+ {
+ color = (attr >> 3) & 0x01;
+
+ sx = battlane_spriteram[offs + 2];
+ sy = battlane_spriteram[offs];
+
+ flipx = attr & 0x04;
+ flipy = attr & 0x02;
+
+ if (!flip_screen)
+ {
+ sx = 240 - sx;
+ sy = 240 - sy;
+ flipx = !flipx;
+ flipy = !flipy;
+ }
+
+ drawgfx(bitmap,machine->gfx[0],
+ code,
+ color,
+ flipx, flipy,
+ sx, sy,
+ cliprect,
+ TRANSPARENCY_PEN, 0);
+
+ if (attr & 0x10) /* Double Y direction */
+ {
+ dy = flipy ? 16 : -16;
+
+ drawgfx(bitmap,machine->gfx[0],
+ code + 1,
+ color,
+ flipx, flipy,
+ sx, sy + dy,
+ cliprect,
+ TRANSPARENCY_PEN, 0);
+ }
+ }
+ }
+}
+
+static void draw_fg_bitmap(running_machine *machine, mame_bitmap *bitmap )
+{
+ int x, y, data;
+
+ for (y = 0; y < 32 * 8; y++)
+ {
+ for (x = 0; x < 32 * 8; x++)
+ {
+ data = *BITMAP_ADDR8(screen_bitmap, y, x);
+
+ if (data)
+ {
+ if (flip_screen)
+ {
+ *BITMAP_ADDR16(bitmap, 255 - y, 255 - x) = machine->pens[data];
+ }
+ else
+ {
+ *BITMAP_ADDR16(bitmap, y, x) = machine->pens[data];
+ }
+ }
+ }
+ }
+}
+
+VIDEO_UPDATE( battlane )
+{
+ tilemap_mark_all_tiles_dirty(bg_tilemap); // HACK
+
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ draw_fg_bitmap(machine, bitmap);
+ return 0;
+}