summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/timeplt.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/video/timeplt.c')
-rw-r--r--src/mame/video/timeplt.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/src/mame/video/timeplt.c b/src/mame/video/timeplt.c
new file mode 100644
index 00000000000..aa0fd21ce8c
--- /dev/null
+++ b/src/mame/video/timeplt.c
@@ -0,0 +1,224 @@
+#include "driver.h"
+
+UINT8 *timeplt_videoram,*timeplt_colorram;
+static tilemap *bg_tilemap;
+
+/*
+sprites are multiplexed, so we have to buffer the spriteram
+scanline by scanline.
+*/
+static UINT8 *sprite_mux_buffer,*sprite_mux_buffer_2;
+static int scanline;
+
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ Time Pilot has two 32x8 palette PROMs and two 256x4 lookup table PROMs
+ (one for characters, one for sprites).
+ The palette PROMs are connected to the RGB output this way:
+
+ bit 7 -- 390 ohm resistor -- BLUE
+ -- 470 ohm resistor -- BLUE
+ -- 560 ohm resistor -- BLUE
+ -- 820 ohm resistor -- BLUE
+ -- 1.2kohm resistor -- BLUE
+ -- 390 ohm resistor -- GREEN
+ -- 470 ohm resistor -- GREEN
+ bit 0 -- 560 ohm resistor -- GREEN
+
+ bit 7 -- 820 ohm resistor -- GREEN
+ -- 1.2kohm resistor -- GREEN
+ -- 390 ohm resistor -- RED
+ -- 470 ohm resistor -- RED
+ -- 560 ohm resistor -- RED
+ -- 820 ohm resistor -- RED
+ -- 1.2kohm resistor -- RED
+ bit 0 -- not connected
+
+***************************************************************************/
+PALETTE_INIT( timeplt )
+{
+ 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,bit3,bit4,r,g,b;
+
+
+ bit0 = (color_prom[i + machine->drv->total_colors] >> 1) & 0x01;
+ bit1 = (color_prom[i + machine->drv->total_colors] >> 2) & 0x01;
+ bit2 = (color_prom[i + machine->drv->total_colors] >> 3) & 0x01;
+ bit3 = (color_prom[i + machine->drv->total_colors] >> 4) & 0x01;
+ bit4 = (color_prom[i + machine->drv->total_colors] >> 5) & 0x01;
+ r = 0x19 * bit0 + 0x24 * bit1 + 0x35 * bit2 + 0x40 * bit3 + 0x4d * bit4;
+ bit0 = (color_prom[i + machine->drv->total_colors] >> 6) & 0x01;
+ bit1 = (color_prom[i + machine->drv->total_colors] >> 7) & 0x01;
+ bit2 = (color_prom[i] >> 0) & 0x01;
+ bit3 = (color_prom[i] >> 1) & 0x01;
+ bit4 = (color_prom[i] >> 2) & 0x01;
+ g = 0x19 * bit0 + 0x24 * bit1 + 0x35 * bit2 + 0x40 * bit3 + 0x4d * bit4;
+ bit0 = (color_prom[i] >> 3) & 0x01;
+ bit1 = (color_prom[i] >> 4) & 0x01;
+ bit2 = (color_prom[i] >> 5) & 0x01;
+ bit3 = (color_prom[i] >> 6) & 0x01;
+ bit4 = (color_prom[i] >> 7) & 0x01;
+ b = 0x19 * bit0 + 0x24 * bit1 + 0x35 * bit2 + 0x40 * bit3 + 0x4d * bit4;
+
+ palette_set_color(machine,i,MAKE_RGB(r,g,b));
+ }
+
+ color_prom += 2*machine->drv->total_colors;
+ /* color_prom now points to the beginning of the lookup table */
+
+
+ /* sprites */
+ for (i = 0;i < TOTAL_COLORS(1);i++)
+ COLOR(1,i) = *(color_prom++) & 0x0f;
+
+ /* characters */
+ for (i = 0;i < TOTAL_COLORS(0);i++)
+ COLOR(0,i) = (*(color_prom++) & 0x0f) + 0x10;
+}
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+static TILE_GET_INFO( get_tile_info )
+{
+ UINT8 attr = timeplt_colorram[tile_index];
+ tileinfo->category = (attr & 0x10) >> 4;
+ SET_TILE_INFO(
+ 0,
+ timeplt_videoram[tile_index] + ((attr & 0x20) << 3),
+ attr & 0x1f,
+ TILE_FLIPYX((attr & 0xc0) >> 6));
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( timeplt )
+{
+ bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_TYPE_PEN,8,8,32,32);
+
+ sprite_mux_buffer = auto_malloc(256 * spriteram_size);
+ sprite_mux_buffer_2 = auto_malloc(256 * spriteram_size);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( timeplt_videoram_w )
+{
+ timeplt_videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset);
+}
+
+WRITE8_HANDLER( timeplt_colorram_w )
+{
+ timeplt_colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset);
+}
+
+WRITE8_HANDLER( timeplt_flipscreen_w )
+{
+ flip_screen_set(~data & 1);
+}
+
+/* Return the current video scan line */
+READ8_HANDLER( timeplt_scanline_r )
+{
+ return scanline;
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,const rectangle *cliprect)
+{
+ const gfx_element *gfx = machine->gfx[1];
+ rectangle clip = *cliprect;
+ int offs;
+ int line;
+
+
+ for (line = 0;line < 256;line++)
+ {
+ if (line >= cliprect->min_y && line <= cliprect->max_y)
+ {
+ UINT8 *sr,*sr2;
+
+ sr = sprite_mux_buffer + line * spriteram_size;
+ sr2 = sprite_mux_buffer_2 + line * spriteram_size;
+ clip.min_y = clip.max_y = line;
+
+ for (offs = spriteram_size - 2;offs >= 0;offs -= 2)
+ {
+ int code,color,sx,sy,flipx,flipy;
+
+ sx = sr[offs];
+ sy = 241 - sr2[offs + 1];
+
+ if (sy > line-16 && sy <= line)
+ {
+ code = sr[offs + 1];
+ color = sr2[offs] & 0x3f;
+ flipx = ~sr2[offs] & 0x40;
+ flipy = sr2[offs] & 0x80;
+
+ drawgfx(bitmap,gfx,
+ code,
+ color,
+ flipx,flipy,
+ sx,sy,
+ &clip,TRANSPARENCY_PEN,0);
+ }
+ }
+ }
+ }
+}
+
+VIDEO_UPDATE( timeplt )
+{
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect);
+ tilemap_draw(bitmap,cliprect,bg_tilemap,1,0);
+ return 0;
+}
+
+
+INTERRUPT_GEN( timeplt_interrupt )
+{
+ scanline = 255 - cpu_getiloops();
+
+ memcpy(sprite_mux_buffer + scanline * spriteram_size,spriteram,spriteram_size);
+ memcpy(sprite_mux_buffer_2 + scanline * spriteram_size,spriteram_2,spriteram_size);
+
+ if (scanline == 255)
+ nmi_line_pulse();
+}