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Diffstat (limited to 'src/mame/video/wiz.c')
-rw-r--r--src/mame/video/wiz.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/src/mame/video/wiz.c b/src/mame/video/wiz.c
new file mode 100644
index 00000000000..ebfe421cda4
--- /dev/null
+++ b/src/mame/video/wiz.c
@@ -0,0 +1,301 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+
+static rectangle spritevisiblearea =
+{
+ 2*8, 32*8-1,
+ 2*8, 30*8-1
+};
+
+static rectangle spritevisibleareaflipx =
+{
+ 0*8, 30*8-1,
+ 2*8, 30*8-1
+};
+
+UINT8 *wiz_videoram2;
+UINT8 *wiz_colorram2;
+UINT8 *wiz_attributesram;
+UINT8 *wiz_attributesram2;
+
+static INT32 flipx, flipy;
+static INT32 bgpen;
+
+UINT8 *wiz_sprite_bank;
+static UINT8 char_bank[2];
+static UINT8 palbank[2];
+static int palette_bank;
+
+
+VIDEO_START( wiz )
+{
+ video_start_generic(machine);
+
+ state_save_register_global_array(char_bank);
+ state_save_register_global_array(palbank);
+ state_save_register_global(flipx);
+ state_save_register_global(flipy);
+ state_save_register_global(bgpen);
+}
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ Stinger has three 256x4 palette PROMs (one per gun).
+ The palette PROMs are connected to the RGB output this way:
+
+ bit 3 -- 100 ohm resistor -- RED/GREEN/BLUE
+ -- 220 ohm resistor -- RED/GREEN/BLUE
+ -- 470 ohm resistor -- RED/GREEN/BLUE
+ bit 0 -- 1 kohm resistor -- RED/GREEN/BLUE
+
+***************************************************************************/
+PALETTE_INIT( wiz )
+{
+ int i;
+
+
+ for (i = 0;i < machine->drv->total_colors;i++)
+ {
+ int bit0,bit1,bit2,bit3,r,g,b;
+
+
+ bit0 = (color_prom[0] >> 0) & 0x01;
+ bit1 = (color_prom[0] >> 1) & 0x01;
+ bit2 = (color_prom[0] >> 2) & 0x01;
+ bit3 = (color_prom[0] >> 3) & 0x01;
+ r = 0x0e * bit0 + 0x1f * bit1 + 0x42 * bit2 + 0x90 * bit3;
+ bit0 = (color_prom[machine->drv->total_colors] >> 0) & 0x01;
+ bit1 = (color_prom[machine->drv->total_colors] >> 1) & 0x01;
+ bit2 = (color_prom[machine->drv->total_colors] >> 2) & 0x01;
+ bit3 = (color_prom[machine->drv->total_colors] >> 3) & 0x01;
+ g = 0x0e * bit0 + 0x1f * bit1 + 0x42 * bit2 + 0x90 * bit3;
+ bit0 = (color_prom[2*machine->drv->total_colors] >> 0) & 0x01;
+ bit1 = (color_prom[2*machine->drv->total_colors] >> 1) & 0x01;
+ bit2 = (color_prom[2*machine->drv->total_colors] >> 2) & 0x01;
+ bit3 = (color_prom[2*machine->drv->total_colors] >> 3) & 0x01;
+ b = 0x0e * bit0 + 0x1f * bit1 + 0x42 * bit2 + 0x90 * bit3;
+
+ palette_set_color(machine,i,MAKE_RGB(r,g,b));
+
+ color_prom++;
+ }
+}
+
+WRITE8_HANDLER( wiz_attributes_w )
+{
+ if ((offset & 1) && wiz_attributesram[offset] != data)
+ {
+ int i;
+
+
+ for (i = offset / 2;i < videoram_size;i += 32)
+ {
+ dirtybuffer[i] = 1;
+ }
+ }
+
+ wiz_attributesram[offset] = data;
+}
+
+WRITE8_HANDLER( wiz_palettebank_w )
+{
+ if (palbank[offset] != (data & 1))
+ {
+ palbank[offset] = data & 1;
+ palette_bank = palbank[0] + 2 * palbank[1];
+
+ memset(dirtybuffer,1,videoram_size);
+ }
+}
+
+WRITE8_HANDLER( wiz_bgcolor_w )
+{
+ bgpen = data;
+}
+
+WRITE8_HANDLER( wiz_char_bank_select_w )
+{
+ if (char_bank[offset] != (data & 1))
+ {
+ char_bank[offset] = data & 1;
+ memset(dirtybuffer,1,videoram_size);
+ }
+}
+
+WRITE8_HANDLER( wiz_flipx_w )
+{
+ if (flipx != data)
+ {
+ flipx = data;
+
+ memset(dirtybuffer, 1, videoram_size);
+ }
+}
+
+
+WRITE8_HANDLER( wiz_flipy_w )
+{
+ if (flipy != data)
+ {
+ flipy = data;
+
+ memset(dirtybuffer, 1, videoram_size);
+ }
+}
+
+static void draw_background(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int bank, int colortype)
+{
+ int offs;
+
+ /* for every character in the Video RAM, check if it has been modified */
+ /* since last time and update it accordingly. */
+
+ for (offs = videoram_size - 1;offs >= 0;offs--)
+ {
+ int scroll,sx,sy,col;
+
+ sx = offs % 32;
+ sy = offs / 32;
+
+ if (colortype)
+ {
+ col = (wiz_attributesram[2 * sx + 1] & 0x07);
+ }
+ else
+ {
+ col = (wiz_attributesram[2 * (offs % 32) + 1] & 0x04) + (videoram[offs] & 3);
+ }
+
+ scroll = (8*sy + 256 - wiz_attributesram[2 * sx]) % 256;
+ if (flipy)
+ {
+ scroll = (248 - scroll) % 256;
+ }
+ if (flipx) sx = 31 - sx;
+
+
+ drawgfx(bitmap,machine->gfx[bank],
+ videoram[offs],
+ col + 8 * palette_bank,
+ flipx,flipy,
+ 8*sx,scroll,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+static void draw_foreground(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect, int colortype)
+{
+ int offs;
+
+ /* draw the frontmost playfield. They are characters, but draw them as sprites. */
+ for (offs = videoram_size - 1;offs >= 0;offs--)
+ {
+ int scroll,sx,sy,col;
+
+
+ sx = offs % 32;
+ sy = offs / 32;
+
+ if (colortype)
+ {
+ col = (wiz_attributesram2[2 * sx + 1] & 0x07);
+ }
+ else
+ {
+ col = (wiz_colorram2[offs] & 0x07);
+ }
+
+ scroll = (8*sy + 256 - wiz_attributesram2[2 * sx]) % 256;
+ if (flipy)
+ {
+ scroll = (248 - scroll) % 256;
+ }
+ if (flipx) sx = 31 - sx;
+
+
+ drawgfx(bitmap,machine->gfx[char_bank[1]],
+ wiz_videoram2[offs],
+ col + 8 * palette_bank,
+ flipx,flipy,
+ 8*sx,scroll,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap,
+ const rectangle *cliprect, UINT8* sprite_ram,
+ int bank)
+{
+ int offs;
+
+ for (offs = spriteram_size - 4;offs >= 0;offs -= 4)
+ {
+ int sx,sy;
+
+
+ sx = sprite_ram[offs + 3];
+ sy = sprite_ram[offs];
+
+ if (!sx || !sy) continue;
+
+ if ( flipx) sx = 240 - sx;
+ if (!flipy) sy = 240 - sy;
+
+ drawgfx(bitmap,machine->gfx[bank],
+ sprite_ram[offs + 1],
+ (sprite_ram[offs + 2] & 0x07) + 8 * palette_bank,
+ flipx,flipy,
+ sx,sy,
+ cliprect,TRANSPARENCY_PEN,0);
+ }
+}
+
+
+VIDEO_UPDATE( kungfut )
+{
+ fillbitmap(bitmap,machine->pens[bgpen],cliprect);
+ draw_background(machine, bitmap, cliprect, 2 + char_bank[0] , 0);
+ draw_foreground(machine, bitmap, cliprect, 0);
+ draw_sprites(machine, bitmap, cliprect, spriteram_2, 4);
+ draw_sprites(machine, bitmap, cliprect, spriteram , 5);
+ return 0;
+}
+
+VIDEO_UPDATE( wiz )
+{
+ int bank;
+ const rectangle* visible_area;
+
+ fillbitmap(bitmap,machine->pens[bgpen],cliprect);
+ draw_background(machine, bitmap, cliprect, 2 + ((char_bank[0] << 1) | char_bank[1]), 0);
+ draw_foreground(machine, bitmap, cliprect, 0);
+
+ visible_area = flipx ? &spritevisibleareaflipx : &spritevisiblearea;
+
+ bank = 7 + *wiz_sprite_bank;
+
+ draw_sprites(machine, bitmap, visible_area, spriteram_2, 6);
+ draw_sprites(machine, bitmap, visible_area, spriteram , bank);
+ return 0;
+}
+
+
+VIDEO_UPDATE( stinger )
+{
+ fillbitmap(bitmap,machine->pens[bgpen],cliprect);
+ draw_background(machine, bitmap, cliprect, 2 + char_bank[0], 1);
+ draw_foreground(machine, bitmap, cliprect, 1);
+ draw_sprites(machine, bitmap, cliprect, spriteram_2, 4);
+ draw_sprites(machine, bitmap, cliprect, spriteram , 5);
+ return 0;
+}