summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/toypop.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/video/toypop.c')
-rw-r--r--src/mame/video/toypop.c236
1 files changed, 236 insertions, 0 deletions
diff --git a/src/mame/video/toypop.c b/src/mame/video/toypop.c
new file mode 100644
index 00000000000..4eeb6b96f97
--- /dev/null
+++ b/src/mame/video/toypop.c
@@ -0,0 +1,236 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT8 *toypop_videoram;
+
+extern UINT8 *m68000_sharedram;
+
+static tilemap *bg_tilemap;
+UINT16 *toypop_bg_image;
+static int bitmapflip,palettebank;
+
+static colortable *toypop_colortable;
+
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ toypop has three 256x4 palette PROM and two 256x8 color lookup table PROMs
+ (one for characters, one for sprites).
+
+***************************************************************************/
+
+PALETTE_INIT( toypop )
+{
+ int i;
+
+ /* allocate the colortable */
+ toypop_colortable = colortable_alloc(machine, 256);
+
+ for (i = 0;i < 256;i++)
+ {
+ int bit0,bit1,bit2,bit3,r,g,b;
+
+ // red component
+ bit0 = (color_prom[i] >> 0) & 0x01;
+ bit1 = (color_prom[i] >> 1) & 0x01;
+ bit2 = (color_prom[i] >> 2) & 0x01;
+ bit3 = (color_prom[i] >> 3) & 0x01;
+ r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+ // green component
+ bit0 = (color_prom[i+0x100] >> 0) & 0x01;
+ bit1 = (color_prom[i+0x100] >> 1) & 0x01;
+ bit2 = (color_prom[i+0x100] >> 2) & 0x01;
+ bit3 = (color_prom[i+0x100] >> 3) & 0x01;
+ g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+ // blue component
+ bit0 = (color_prom[i+0x200] >> 0) & 0x01;
+ bit1 = (color_prom[i+0x200] >> 1) & 0x01;
+ bit2 = (color_prom[i+0x200] >> 2) & 0x01;
+ bit3 = (color_prom[i+0x200] >> 3) & 0x01;
+ b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
+
+ colortable_palette_set_color(toypop_colortable, i, MAKE_RGB(r,g,b));
+ }
+
+ for (i = 0;i < 256;i++)
+ {
+ UINT8 entry;
+
+ // characters
+ colortable_entry_set_value(toypop_colortable, i + 0*256, (color_prom[i + 0x300] & 0x0f) | 0x70);
+ colortable_entry_set_value(toypop_colortable, i + 1*256, (color_prom[i + 0x300] & 0x0f) | 0xf0);
+ // sprites
+ entry = color_prom[i + 0x500];
+ colortable_entry_set_value(toypop_colortable, i + 2*256, entry);
+ }
+ for (i = 0;i < 16;i++)
+ {
+ // background
+ colortable_entry_set_value(toypop_colortable, i + 3*256 + 0*16, 0x60 + i);
+ colortable_entry_set_value(toypop_colortable, i + 3*256 + 1*16, 0xe0 + i);
+ }
+}
+
+
+
+/***************************************************************************
+
+ Callbacks for the TileMap code
+
+***************************************************************************/
+
+/* convert from 32x32 to 36x28 */
+static TILEMAP_MAPPER( tilemap_scan )
+{
+ int offs;
+
+ row += 2;
+ col -= 2;
+ if (col & 0x20)
+ offs = row + ((col & 0x1f) << 5);
+ else
+ offs = col + (row << 5);
+
+ return offs;
+}
+
+static TILE_GET_INFO( get_tile_info )
+{
+ UINT8 attr = toypop_videoram[tile_index + 0x400];
+ SET_TILE_INFO(
+ 0,
+ toypop_videoram[tile_index],
+ (attr & 0x3f) + 0x40 * palettebank,
+ 0);
+}
+
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( toypop )
+{
+ bg_tilemap = tilemap_create(get_tile_info,tilemap_scan,TILEMAP_TYPE_PEN,8,8,36,28);
+
+ tilemap_set_transparent_pen(bg_tilemap, 0);
+}
+
+
+
+/***************************************************************************
+
+ Memory handlers
+
+***************************************************************************/
+
+WRITE8_HANDLER( toypop_videoram_w )
+{
+ toypop_videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap,offset & 0x3ff);
+}
+
+WRITE8_HANDLER( toypop_palettebank_w )
+{
+ if (palettebank != (offset & 1))
+ {
+ palettebank = offset & 1;
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+WRITE16_HANDLER( toypop_flipscreen_w )
+{
+ bitmapflip = offset & 1;
+}
+
+READ16_HANDLER( toypop_merged_background_r )
+{
+ int data1, data2;
+
+ // 0x0a0b0c0d is read as 0xabcd
+ data1 = toypop_bg_image[2*offset];
+ data2 = toypop_bg_image[2*offset + 1];
+ return ((data1 & 0xf00) << 4) | ((data1 & 0xf) << 8) | ((data2 & 0xf00) >> 4) | (data2 & 0xf);
+}
+
+WRITE16_HANDLER( toypop_merged_background_w )
+{
+ // 0xabcd is written as 0x0a0b0c0d in the background image
+ if (ACCESSING_MSB)
+ toypop_bg_image[2*offset] = ((data & 0xf00) >> 8) | ((data & 0xf000) >> 4);
+
+ if (ACCESSING_LSB)
+ toypop_bg_image[2*offset+1] = (data & 0xf) | ((data & 0xf0) << 4);
+}
+
+static void draw_background(mame_bitmap *bitmap)
+{
+ register int offs, x, y;
+ UINT8 scanline[288];
+
+ // copy the background image from RAM (0x190200-0x19FDFF) to bitmap
+ if (bitmapflip)
+ {
+ offs = 0xFDFE/2;
+ for (y = 0; y < 224; y++)
+ {
+ for (x = 0; x < 288; x+=2)
+ {
+ UINT16 data = toypop_bg_image[offs];
+ scanline[x] = data;
+ scanline[x+1] = data >> 8;
+ offs--;
+ }
+ draw_scanline8(bitmap, 0, y, 288, scanline, &Machine->pens[0x300 + 0x10*palettebank], -1);
+ }
+ }
+ else
+ {
+ offs = 0x200/2;
+ for (y = 0; y < 224; y++)
+ {
+ for (x = 0; x < 288; x+=2)
+ {
+ UINT16 data = toypop_bg_image[offs];
+ scanline[x] = data >> 8;
+ scanline[x+1] = data;
+ offs++;
+ }
+ draw_scanline8(bitmap, 0, y, 288, scanline, &Machine->pens[0x300 + 0x10*palettebank], -1);
+ }
+ }
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+/* from mappy.c */
+void mappy_draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int xoffs, int yoffs, colortable *ctable, int transcolor);
+
+
+VIDEO_UPDATE( toypop )
+{
+ draw_background(bitmap);
+ tilemap_draw(bitmap,cliprect,bg_tilemap,0,0);
+
+ mappy_draw_sprites(machine, bitmap, cliprect, -31, -8, toypop_colortable, 0xff);
+ return 0;
+}