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Diffstat (limited to 'src/mame/video/simpsons.c')
-rw-r--r--src/mame/video/simpsons.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/src/mame/video/simpsons.c b/src/mame/video/simpsons.c
new file mode 100644
index 00000000000..13bf7ecbea8
--- /dev/null
+++ b/src/mame/video/simpsons.c
@@ -0,0 +1,181 @@
+#include "driver.h"
+#include "video/konamiic.h"
+
+static int bg_colorbase,sprite_colorbase,layer_colorbase[3];
+UINT8 *simpsons_xtraram;
+static int layerpri[3];
+
+
+/***************************************************************************
+
+ Callbacks for the K052109
+
+***************************************************************************/
+
+static void tile_callback(int layer,int bank,int *code,int *color,int *flags,int *priority)
+{
+ *code |= ((*color & 0x3f) << 8) | (bank << 14);
+ *color = layer_colorbase[layer] + ((*color & 0xc0) >> 6);
+}
+
+
+/***************************************************************************
+
+ Callbacks for the K053247
+
+***************************************************************************/
+
+static void sprite_callback(int *code,int *color,int *priority_mask)
+{
+ int pri = (*color & 0x0f80) >> 6; /* ??????? */
+ if (pri <= layerpri[2]) *priority_mask = 0;
+ else if (pri > layerpri[2] && pri <= layerpri[1]) *priority_mask = 0xf0;
+ else if (pri > layerpri[1] && pri <= layerpri[0]) *priority_mask = 0xf0|0xcc;
+ else *priority_mask = 0xf0|0xcc|0xaa;
+
+ *color = sprite_colorbase + (*color & 0x001f);
+}
+
+
+/***************************************************************************
+
+ Start the video hardware emulation.
+
+***************************************************************************/
+
+VIDEO_START( simpsons )
+{
+ K053251_vh_start();
+
+ K052109_vh_start(machine,REGION_GFX1,NORMAL_PLANE_ORDER,tile_callback);
+ K053247_vh_start(machine,REGION_GFX2,53,23,NORMAL_PLANE_ORDER,sprite_callback);
+}
+
+/***************************************************************************
+
+ Extra video banking
+
+***************************************************************************/
+
+static READ8_HANDLER( simpsons_K052109_r )
+{
+ return K052109_r(offset + 0x2000);
+}
+
+static WRITE8_HANDLER( simpsons_K052109_w )
+{
+ K052109_w(offset + 0x2000,data);
+}
+
+static READ8_HANDLER( simpsons_K053247_r )
+{
+ int offs;
+
+ if (offset < 0x1000)
+ {
+ offs = offset >> 1;
+
+ if (offset & 1)
+ return(spriteram16[offs] & 0xff);
+ else
+ return(spriteram16[offs] >> 8);
+ }
+ else return simpsons_xtraram[offset - 0x1000];
+}
+
+static WRITE8_HANDLER( simpsons_K053247_w )
+{
+ int offs;
+
+ if (offset < 0x1000)
+ {
+ offs = offset >> 1;
+
+ if (offset & 1)
+ spriteram16[offs] = (spriteram16[offs] & 0xff00) | data;
+ else
+ spriteram16[offs] = (spriteram16[offs] & 0x00ff) | (data<<8);
+ }
+ else simpsons_xtraram[offset - 0x1000] = data;
+}
+
+void simpsons_video_banking(int bank)
+{
+ if (bank & 1)
+ {
+ memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, paletteram_r);
+ memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, paletteram_xBBBBBGGGGGRRRRR_be_w);
+ }
+ else
+ {
+ memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, K052109_r);
+ memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x0000, 0x0fff, 0, 0, K052109_w);
+ }
+
+ if (bank & 2)
+ {
+ memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K053247_r);
+ memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K053247_w);
+ }
+ else
+ {
+ memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K052109_r);
+ memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x2000, 0x3fff, 0, 0, simpsons_K052109_w);
+ }
+}
+
+
+
+/***************************************************************************
+
+ Display refresh
+
+***************************************************************************/
+
+/* useful function to sort the three tile layers by priority order */
+static void sortlayers(int *layer,int *pri)
+{
+#define SWAP(a,b) \
+ if (pri[a] < pri[b]) \
+ { \
+ int t; \
+ t = pri[a]; pri[a] = pri[b]; pri[b] = t; \
+ t = layer[a]; layer[a] = layer[b]; layer[b] = t; \
+ }
+
+ SWAP(0,1)
+ SWAP(0,2)
+ SWAP(1,2)
+}
+
+VIDEO_UPDATE( simpsons )
+{
+ int layer[3];
+
+
+ bg_colorbase = K053251_get_palette_index(K053251_CI0);
+ sprite_colorbase = K053251_get_palette_index(K053251_CI1);
+ layer_colorbase[0] = K053251_get_palette_index(K053251_CI2);
+ layer_colorbase[1] = K053251_get_palette_index(K053251_CI3);
+ layer_colorbase[2] = K053251_get_palette_index(K053251_CI4);
+
+ K052109_tilemap_update();
+
+ layer[0] = 0;
+ layerpri[0] = K053251_get_priority(K053251_CI2);
+ layer[1] = 1;
+ layerpri[1] = K053251_get_priority(K053251_CI3);
+ layer[2] = 2;
+ layerpri[2] = K053251_get_priority(K053251_CI4);
+
+ sortlayers(layer,layerpri);
+
+ fillbitmap(priority_bitmap,0,cliprect);
+ fillbitmap(bitmap,machine->pens[16 * bg_colorbase],cliprect);
+ tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[0]],0,1);
+ tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[1]],0,2);
+ tilemap_draw(bitmap,cliprect,K052109_tilemap[layer[2]],0,4);
+
+ K053247_sprites_draw(machine, bitmap,cliprect);
+ return 0;
+}