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Diffstat (limited to 'src/mame/video/tankbatt.c')
-rw-r--r--src/mame/video/tankbatt.c110
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;
+}