diff options
Diffstat (limited to 'src/mame/video/gotya.c')
-rw-r--r-- | src/mame/video/gotya.c | 192 |
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; +} |