diff options
Diffstat (limited to 'src/mame/video/tankbatt.c')
-rw-r--r-- | src/mame/video/tankbatt.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/mame/video/tankbatt.c b/src/mame/video/tankbatt.c new file mode 100644 index 00000000000..89cab70b26d --- /dev/null +++ b/src/mame/video/tankbatt.c @@ -0,0 +1,110 @@ +/*************************************************************************** + + video.c + + Functions to emulate the video hardware of the machine. + +***************************************************************************/ + +#include "driver.h" + +UINT8 *tankbatt_bulletsram; +size_t tankbatt_bulletsram_size; + +static tilemap *bg_tilemap; + +/*************************************************************************** + + Convert the color PROMs into a more useable format. + +***************************************************************************/ +PALETTE_INIT( tankbatt ) +{ + int i; + + #define RES_1 0xc0 /* this is a guess */ + #define RES_2 0x3f /* this is a guess */ + + /* Stick black in there */ + palette_set_color(machine,0,MAKE_RGB(0,0,0)); + + /* ? Skip the first byte ? */ + color_prom++; + + for (i = 1;i < machine->drv->total_colors;i++) + { + int bit0, bit1, bit2, bit3, r, g, b; + + bit0 = (*color_prom >> 0) & 0x01; /* intensity */ + bit1 = (*color_prom >> 1) & 0x01; /* red */ + bit2 = (*color_prom >> 2) & 0x01; /* green */ + bit3 = (*color_prom >> 3) & 0x01; /* blue */ + + /* red component */ + r = RES_1 * bit1; + if (bit1) r += RES_2 * bit0; + + /* green component */ + g = RES_1 * bit2; + if (bit2) g += RES_2 * bit0; + + /* blue component */ + b = RES_1 * bit3; + if (bit3) b += RES_2 * bit0; + + palette_set_color(machine,i,MAKE_RGB(r,g,b)); + color_prom += 4; + } + + for (i = 0;i < 128;i++) + { + colortable[i++] = 0; + colortable[i] = (i/2) + 1; + } +} + +WRITE8_HANDLER( tankbatt_videoram_w ) +{ + videoram[offset] = data; + tilemap_mark_tile_dirty(bg_tilemap, offset); +} + +static TILE_GET_INFO( get_bg_tile_info ) +{ + int code = videoram[tile_index]; + int color = videoram[tile_index] >> 2; + + SET_TILE_INFO(0, code, color, 0); +} + +VIDEO_START( tankbatt ) +{ + bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows, + TILEMAP_TYPE_PEN, 8, 8, 32, 32); +} + +static void draw_bullets(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect) +{ + int offs; + + for (offs = 0;offs < tankbatt_bulletsram_size;offs += 2) + { + int color = 63; /* cyan, same color as the tanks */ + int x = tankbatt_bulletsram[offs + 1]; + int y = 255 - tankbatt_bulletsram[offs] - 2; + + drawgfx(bitmap,machine->gfx[1], + 0, /* this is just a square, generated by the hardware */ + color, + 0,0, + x,y, + cliprect,TRANSPARENCY_NONE,0); + } +} + +VIDEO_UPDATE( tankbatt ) +{ + tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0); + draw_bullets(machine, bitmap, cliprect); + return 0; +} |