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Diffstat (limited to 'src/mame/video/speedspn.c')
-rw-r--r--src/mame/video/speedspn.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/src/mame/video/speedspn.c b/src/mame/video/speedspn.c
new file mode 100644
index 00000000000..ea6615153a0
--- /dev/null
+++ b/src/mame/video/speedspn.c
@@ -0,0 +1,113 @@
+/* Speed Spin video, see driver file for notes */
+
+#include "driver.h"
+
+UINT8 *speedspn_attram;
+
+static tilemap *speedspn_tilemap;
+static UINT8 speedspn_display_disable = 0;
+static int speedspn_bank_vidram = 0;
+static UINT8* speedspn_vidram;
+
+
+static TILE_GET_INFO( get_speedspn_tile_info )
+{
+ int code = speedspn_vidram[tile_index*2+1] | (speedspn_vidram[tile_index*2] << 8);
+ int attr = speedspn_attram[tile_index^0x400];
+
+ SET_TILE_INFO(0,code,attr & 0x3f,(attr & 0x80) ? TILE_FLIPX : 0);
+}
+
+VIDEO_START(speedspn)
+{
+ speedspn_vidram = auto_malloc(0x1000 * 2);
+ speedspn_tilemap = tilemap_create(get_speedspn_tile_info,tilemap_scan_cols,TILEMAP_TYPE_PEN, 8, 8,64,32);
+}
+
+WRITE8_HANDLER( speedspn_vidram_w )
+{
+ speedspn_vidram[offset + speedspn_bank_vidram] = data;
+
+ if (speedspn_bank_vidram == 0)
+ tilemap_mark_tile_dirty(speedspn_tilemap,offset/2);
+}
+
+WRITE8_HANDLER( speedspn_attram_w )
+{
+ speedspn_attram[offset] = data;
+
+ tilemap_mark_tile_dirty(speedspn_tilemap,offset^0x400);
+}
+
+READ8_HANDLER( speedspn_vidram_r )
+{
+ return speedspn_vidram[offset + speedspn_bank_vidram];
+}
+
+WRITE8_HANDLER(speedspn_banked_vidram_change)
+{
+// logerror("VidRam Bank: %04x\n", data);
+ speedspn_bank_vidram = data & 1;
+ speedspn_bank_vidram *= 0x1000;
+}
+
+WRITE8_HANDLER(speedspn_global_display_w)
+{
+// logerror("Global display: %u\n", data);
+ speedspn_display_disable = data & 1;
+}
+
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect )
+{
+ const gfx_element *gfx = machine->gfx[1];
+ UINT8 *source = speedspn_vidram+ 0x1000;
+ UINT8 *finish = source + 0x1000;
+
+ while( source<finish )
+ {
+ int xpos = source[0];
+ int tileno = source[1];
+ int attr = source[2];
+ int ypos = source[3];
+ int color;
+
+ if (attr&0x10) xpos +=0x100;
+
+ xpos = 0x1f8-xpos;
+ tileno += ((attr & 0xe0) >> 5) * 0x100;
+ color = attr & 0x0f;
+
+ drawgfx(bitmap,gfx,
+ tileno,
+ color,
+ 0,0,
+ xpos,ypos,
+ cliprect,TRANSPARENCY_PEN,15);
+
+ source +=4;
+ }
+}
+
+
+VIDEO_UPDATE(speedspn)
+{
+ if (speedspn_display_disable)
+ {
+ fillbitmap(bitmap,get_black_pen(machine),cliprect);
+ return 0;
+ }
+
+#if 0
+ {
+ FILE* f;
+ f = fopen("vidram.bin","wb");
+ fwrite(speedspn_vidram, 1, 0x1000 * 2, f);
+ fclose(f);
+ }
+#endif
+ tilemap_set_scrollx(speedspn_tilemap,0, 0x100); // verify
+ tilemap_draw(bitmap,cliprect,speedspn_tilemap,0,0);
+ draw_sprites(machine, bitmap,cliprect);
+ return 0;
+}