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Diffstat (limited to 'src/mame/video/zodiack.c')
-rw-r--r--src/mame/video/zodiack.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/src/mame/video/zodiack.c b/src/mame/video/zodiack.c
new file mode 100644
index 00000000000..f14bc6b0f9a
--- /dev/null
+++ b/src/mame/video/zodiack.c
@@ -0,0 +1,219 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+#include "includes/espial.h"
+
+UINT8 *zodiack_videoram2;
+UINT8 *zodiack_attributesram;
+UINT8 *zodiack_bulletsram;
+size_t zodiack_bulletsram_size;
+
+static tilemap *bg_tilemap, *fg_tilemap;
+
+WRITE8_HANDLER( zodiack_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( zodiack_videoram2_w )
+{
+ zodiack_videoram2[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( zodiack_attributes_w )
+{
+ if ((offset & 1) && zodiack_attributesram[offset] != data)
+ {
+ int i;
+
+ for (i = offset / 2;i < videoram_size; i += 32)
+ {
+ tilemap_mark_tile_dirty(bg_tilemap, i);
+ tilemap_mark_tile_dirty(fg_tilemap, i);
+ }
+ }
+
+ zodiack_attributesram[offset] = data;
+}
+
+WRITE8_HANDLER( zodiack_flipscreen_w )
+{
+ if (flip_screen != (~data & 0x01))
+ {
+ flip_screen_set(~data & 0x01);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+PALETTE_INIT( zodiack )
+{
+ 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])
+
+ /* first, the character/sprite palette */
+ for (i = 0;i < machine->drv->total_colors-1; 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++;
+ }
+
+ /* white for bullets */
+
+ palette_set_color(machine,machine->drv->total_colors-1,MAKE_RGB(0xff,0xff,0xff));
+
+ for (i = 0;i < TOTAL_COLORS(0);i+=2)
+ {
+ COLOR(0,i ) = (32 + (i / 2));
+ COLOR(0,i+1) = (40 + (i / 2));
+ }
+
+ for (i = 0;i < TOTAL_COLORS(3);i++)
+ {
+ if ((i & 3) == 0) COLOR(3,i) = 0;
+ }
+
+ /* bullet */
+ COLOR(2, 0) = 0;
+ COLOR(2, 1) = 48;
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = zodiack_videoram2[tile_index];
+ int color = (zodiack_attributesram[2 * (tile_index % 32) + 1] >> 4) & 0x07;
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int code = videoram[tile_index];
+ int color = zodiack_attributesram[2 * (tile_index % 32) + 1] & 0x07;
+
+ SET_TILE_INFO(3, code, color, 0);
+}
+
+VIDEO_START( zodiack )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ tilemap_set_transparent_pen(fg_tilemap, 0);
+ tilemap_set_scroll_cols(fg_tilemap, 32);
+
+ flip_screen = 0;
+}
+
+static void draw_bullets(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = 0; offs < zodiack_bulletsram_size; offs += 4)
+ {
+ int x, y;
+
+ x = zodiack_bulletsram[offs + 3] + 7;
+ y = 255 - zodiack_bulletsram[offs + 1];
+
+ if (flip_screen && percuss_hardware)
+ {
+ y = 255 - y;
+ }
+
+ drawgfx(
+ bitmap,
+ machine->gfx[2],
+ 0, /* this is just a dot, generated by the hardware */
+ 0,
+ 0,0,
+ x,y,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
+{
+ int offs;
+
+ for (offs = spriteram_size - 4; offs >= 0; offs -= 4)
+ {
+ int flipx, flipy, sx, sy, spritecode;
+
+ sx = 240 - spriteram[offs + 3];
+ sy = 240 - spriteram[offs];
+ flipx = !(spriteram[offs + 1] & 0x40);
+ flipy = spriteram[offs + 1] & 0x80;
+ spritecode = spriteram[offs + 1] & 0x3f;
+
+ if (flip_screen && percuss_hardware)
+ {
+ sy = 240 - sy;
+ flipy = !flipy;
+ }
+
+ drawgfx(bitmap, machine->gfx[1],
+ spritecode,
+ spriteram[offs + 2] & 0x07,
+ flipx, flipy,
+ sx, sy,
+ //flip_screen[0] ? &spritevisibleareaflipx : &spritevisiblearea,TRANSPARENCY_PEN,0);
+ //&spritevisiblearea,TRANSPARENCY_PEN,0);
+ cliprect, TRANSPARENCY_PEN, 0);
+ }
+}
+
+VIDEO_UPDATE( zodiack )
+{
+ int i;
+
+ for (i = 0; i < 32; i++)
+ {
+ tilemap_set_scrolly(fg_tilemap, i, zodiack_attributesram[i * 2]);
+ }
+
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ tilemap_draw(bitmap, cliprect, fg_tilemap, 0, 0);
+ draw_bullets(machine, bitmap, cliprect);
+ draw_sprites(machine, bitmap, cliprect);
+ return 0;
+}