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Diffstat (limited to 'src/mame/video/gotya.c')
-rw-r--r--src/mame/video/gotya.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/src/mame/video/gotya.c b/src/mame/video/gotya.c
new file mode 100644
index 00000000000..c3642881980
--- /dev/null
+++ b/src/mame/video/gotya.c
@@ -0,0 +1,192 @@
+#include "driver.h"
+
+UINT8 *gotya_scroll;
+UINT8 *gotya_videoram2;
+
+static int scroll_bit_8;
+
+static tilemap *bg_tilemap;
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ I'm using Pac Man resistor values
+
+***************************************************************************/
+PALETTE_INIT( gotya )
+{
+ int i;
+
+ #define TOTAL_COLORS(gfxn) (machine->gfx[gfxn]->total_colors * machine->gfx[gfxn]->color_granularity)
+ #define COLOR(gfxn,offs) (colortable[machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
+
+ for (i = 0; i < machine->drv->total_colors; i++)
+ {
+ int bit0, bit1, bit2, r, g, b;
+
+ /* red component */
+
+ bit0 = (*color_prom >> 0) & 0x01;
+ bit1 = (*color_prom >> 1) & 0x01;
+ bit2 = (*color_prom >> 2) & 0x01;
+
+ r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* green component */
+
+ bit0 = (*color_prom >> 3) & 0x01;
+ bit1 = (*color_prom >> 4) & 0x01;
+ bit2 = (*color_prom >> 5) & 0x01;
+
+ g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* blue component */
+
+ bit0 = 0;
+ bit1 = (*color_prom >> 6) & 0x01;
+ bit2 = (*color_prom >> 7) & 0x01;
+
+ b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ palette_set_color(machine, i, MAKE_RGB(r, g, b));
+
+ color_prom++;
+ }
+
+ color_prom += 0x18;
+ /* color_prom now points to the beginning of the lookup table */
+
+ /* character lookup table */
+ /* sprites use the same color lookup table as characters */
+
+ for (i = 0; i < TOTAL_COLORS(0); i++)
+ {
+ COLOR(0, i) = *(color_prom++) & 0x07;
+ }
+}
+
+WRITE8_HANDLER( gotya_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( gotya_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( gotya_video_control_w )
+{
+ /* bit 0 - scroll bit 8
+ bit 1 - flip screen
+ bit 2 - sound disable ??? */
+
+ scroll_bit_8 = data & 0x01;
+
+ if (flip_screen != (data & 0x02))
+ {
+ flip_screen_set(data & 0x02);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = videoram[tile_index];
+ int color = colorram[tile_index] & 0x0f;
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+static TILEMAP_MAPPER( tilemap_scan_rows_thehand )
+{
+ /* logical (col,row) -> memory offset */
+ row = 31-row;
+ col = 63-col;
+ return ((row)*(num_cols>>1)) + (col&31) + ((col>>5)*0x400);
+}
+
+VIDEO_START( gotya )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows_thehand,
+ TILEMAP_TYPE_PEN, 8, 8, 64, 32);
+}
+
+static void draw_status_row(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int sx, int col)
+{
+ int row;
+
+ if (flip_screen)
+ {
+ sx = 35 - sx;
+ }
+
+ for (row = 29; row >= 0; row--)
+ {
+ int sy;
+
+ if (flip_screen)
+ {
+ sy = row;
+ }
+ else
+ {
+ sy = 31 - row;
+ }
+
+ drawgfx(bitmap,machine->gfx[0],
+ gotya_videoram2[row * 32 + col],
+ gotya_videoram2[row * 32 + col + 0x10] & 0x0f,
+ flip_screen_x, flip_screen_y,
+ 8 * sx, 8 * sy,
+ cliprect,
+ TRANSPARENCY_NONE, 0);
+ }
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = 2; offs < 0x0e; offs += 2)
+ {
+ int code = spriteram[offs + 0x01] >> 2;
+ int color = spriteram[offs + 0x11] & 0x0f;
+ int sx = 256 - spriteram[offs + 0x10] + (spriteram[offs + 0x01] & 0x01) * 256;
+ int sy = spriteram[offs + 0x00];
+
+ if (flip_screen)
+ {
+ sy = 240 - sy;
+ }
+
+ drawgfx(bitmap,machine->gfx[1],
+ code, color,
+ flip_screen_x, flip_screen_y,
+ sx, sy,
+ cliprect,
+ TRANSPARENCY_PEN, 0);
+ }
+}
+
+static void draw_status(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ draw_status_row(machine, bitmap, cliprect, 0, 1);
+ draw_status_row(machine, bitmap, cliprect, 1, 0);
+ draw_status_row(machine, bitmap, cliprect, 2, 2); /* these two are blank, but I dont' know if the data comes */
+ draw_status_row(machine, bitmap, cliprect, 33, 13); /* from RAM or 'hardcoded' into the hardware. Likely the latter */
+ draw_status_row(machine, bitmap, cliprect, 35, 14);
+ draw_status_row(machine, bitmap, cliprect, 34, 15);
+}
+
+VIDEO_UPDATE( gotya )
+{
+ tilemap_set_scrollx(bg_tilemap, 0, -(*gotya_scroll + (scroll_bit_8 * 256)) - 2 * 8);
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ draw_status(machine, bitmap, cliprect);
+ return 0;
+}