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-rw-r--r--src/mame/video/rockola.c310
1 files changed, 310 insertions, 0 deletions
diff --git a/src/mame/video/rockola.c b/src/mame/video/rockola.c
new file mode 100644
index 00000000000..1f34917b6a9
--- /dev/null
+++ b/src/mame/video/rockola.c
@@ -0,0 +1,310 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT8 *rockola_videoram2;
+UINT8 *rockola_charram;
+
+static int charbank;
+static int backcolor;
+
+static tilemap *bg_tilemap, *fg_tilemap;
+
+static rgb_t palette[64];
+
+#define TOTAL_COLORS(gfxn) (Machine->gfx[gfxn]->total_colors * Machine->gfx[gfxn]->color_granularity)
+#define COLOR(gfxn,offs) (Machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs)
+
+
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ Zarzon has a different PROM layout from the others.
+
+***************************************************************************/
+PALETTE_INIT( rockola )
+{
+ int i;
+
+ for (i = 0; i < machine->drv->total_colors; i++)
+ {
+ int bit0, bit1, bit2, r, g, b;
+
+ /* red component */
+
+ bit0 = (*color_prom >> 0) & 0x01;
+ bit1 = (*color_prom >> 1) & 0x01;
+ bit2 = (*color_prom >> 2) & 0x01;
+
+ r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* green component */
+
+ bit0 = (*color_prom >> 3) & 0x01;
+ bit1 = (*color_prom >> 4) & 0x01;
+ bit2 = (*color_prom >> 5) & 0x01;
+
+ g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* blue component */
+
+ bit0 = 0;
+ bit1 = (*color_prom >> 6) & 0x01;
+ bit2 = (*color_prom >> 7) & 0x01;
+
+ b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ palette[i] = MAKE_RGB(r, g, b);
+
+ color_prom++;
+ }
+
+ backcolor = 0; /* background color can be changed by the game */
+
+ for (i = 0; i < TOTAL_COLORS(0); i++)
+ palette_set_color(machine, COLOR(0, i), palette[i]);
+
+ for (i = 0; i < TOTAL_COLORS(1); i++)
+ {
+ if (i % 4 == 0)
+ palette_set_color(machine, COLOR(1, i), palette[4 * backcolor + 0x20]);
+ else
+ palette_set_color(machine, COLOR(1, i), palette[i + 0x20]);
+ }
+}
+
+WRITE8_HANDLER( rockola_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( rockola_videoram2_w )
+{
+ rockola_videoram2[offset] = data;
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( rockola_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+ tilemap_mark_tile_dirty(fg_tilemap, offset);
+}
+
+WRITE8_HANDLER( rockola_charram_w )
+{
+ if (rockola_charram[offset] != data)
+ {
+ rockola_charram[offset] = data;
+ tilemap_mark_all_tiles_dirty(fg_tilemap);
+ }
+}
+
+WRITE8_HANDLER( rockola_flipscreen_w )
+{
+ int bank;
+
+ /* bits 0-2 select background color */
+
+ if (backcolor != (data & 7))
+ {
+ int i;
+
+ backcolor = data & 7;
+
+ for (i = 0;i < 32;i += 4)
+ palette_set_color(Machine, COLOR(1, i), palette[4 * backcolor + 0x20]);
+ }
+
+ /* bit 3 selects char bank */
+
+ bank = (~data & 0x08) >> 3;
+
+ if (charbank != bank)
+ {
+ charbank = bank;
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+
+ /* bit 7 flips screen */
+
+ if (flip_screen != (data & 0x80))
+ {
+ flip_screen_set(data & 0x80);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+WRITE8_HANDLER( rockola_scrollx_w )
+{
+ tilemap_set_scrollx(bg_tilemap, 0, data);
+}
+
+WRITE8_HANDLER( rockola_scrolly_w )
+{
+ tilemap_set_scrolly(bg_tilemap, 0, data);
+}
+
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = videoram[tile_index] + 256 * charbank;
+ int color = (colorram[tile_index] & 0x38) >> 3;
+
+ SET_TILE_INFO(1, code, color, 0);
+}
+
+static TILE_GET_INFO( get_fg_tile_info )
+{
+ int code = rockola_videoram2[tile_index];
+ int color = colorram[tile_index] & 0x07;
+
+ decodechar(machine->gfx[0], code, rockola_charram,
+ machine->drv->gfxdecodeinfo[0].gfxlayout);
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+VIDEO_START( rockola )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ fg_tilemap = tilemap_create(get_fg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ tilemap_set_transparent_pen(fg_tilemap, 0);
+}
+
+VIDEO_UPDATE( rockola )
+{
+ tilemap_draw(bitmap, &machine->screen[0].visarea, bg_tilemap, 0, 0);
+ tilemap_draw(bitmap, &machine->screen[0].visarea, fg_tilemap, 0, 0);
+ return 0;
+}
+
+/* Satan of Saturn */
+
+PALETTE_INIT( satansat )
+{
+ int i;
+
+ for (i = 0; i < machine->drv->total_colors; i++)
+ {
+ int bit0, bit1, bit2, r, g, b;
+
+ /* red component */
+
+ bit0 = (*color_prom >> 0) & 0x01;
+ bit1 = (*color_prom >> 1) & 0x01;
+ bit2 = (*color_prom >> 2) & 0x01;
+
+ r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* green component */
+
+ bit0 = (*color_prom >> 3) & 0x01;
+ bit1 = (*color_prom >> 4) & 0x01;
+ bit2 = (*color_prom >> 5) & 0x01;
+
+ g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ /* blue component */
+
+ bit0 = 0;
+ bit1 = (*color_prom >> 6) & 0x01;
+ bit2 = (*color_prom >> 7) & 0x01;
+
+ b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
+
+ palette[i] = MAKE_RGB(r, g, b);
+
+ color_prom++;
+ }
+
+ backcolor = 0; /* background color can be changed by the game */
+
+ for (i = 0; i < TOTAL_COLORS(0); i++)
+ palette_set_color(machine, COLOR(0, i), palette[4 * (i % 4) + (i / 4)]);
+
+ for (i = 0; i < TOTAL_COLORS(1); i++)
+ {
+ if (i % 4 == 0)
+ palette_set_color(machine, COLOR(1, i), palette[backcolor + 0x10]);
+ else
+ palette_set_color(machine, COLOR(1, i), palette[4 * (i % 4) + (i / 4) + 0x10]);
+ }
+}
+
+WRITE8_HANDLER( satansat_b002_w )
+{
+ /* bit 0 flips screen */
+
+ if (flip_screen != (data & 0x01))
+ {
+ flip_screen_set(data & 0x01);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+
+ /* bit 1 enables interrups */
+ /* it controls only IRQs, not NMIs. Here I am affecting both, which */
+ /* is wrong. */
+
+ interrupt_enable_w(0,data & 0x02);
+
+ /* other bits unused */
+}
+
+WRITE8_HANDLER( satansat_backcolor_w )
+{
+ /* bits 0-1 select background color. Other bits unused. */
+
+ if (backcolor != (data & 0x03))
+ {
+ int i;
+
+ backcolor = data & 0x03;
+
+ for (i = 0; i < 16; i += 4)
+ palette_set_color(Machine, COLOR(1, i), palette[backcolor + 0x10]);
+ }
+}
+
+static TILE_GET_INFO( satansat_get_bg_tile_info )
+{
+ int code = videoram[tile_index];
+ int color = (colorram[tile_index] & 0x0c) >> 2;
+
+ SET_TILE_INFO(1, code, color, 0);
+}
+
+static TILE_GET_INFO( satansat_get_fg_tile_info )
+{
+ int code = rockola_videoram2[tile_index];
+ int color = colorram[tile_index] & 0x03;
+
+ decodechar(machine->gfx[0], code, rockola_charram,
+ machine->drv->gfxdecodeinfo[0].gfxlayout);
+
+ SET_TILE_INFO(0, code, color, 0);
+}
+
+VIDEO_START( satansat )
+{
+ bg_tilemap = tilemap_create(satansat_get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ fg_tilemap = tilemap_create(satansat_get_fg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 32, 32);
+
+ tilemap_set_transparent_pen(fg_tilemap, 0);
+}