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Diffstat (limited to 'src/mame/video/hyperspt.c')
-rw-r--r--src/mame/video/hyperspt.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/src/mame/video/hyperspt.c b/src/mame/video/hyperspt.c
new file mode 100644
index 00000000000..8cc753be1fb
--- /dev/null
+++ b/src/mame/video/hyperspt.c
@@ -0,0 +1,189 @@
+/***************************************************************************
+
+ video.c
+
+ Functions to emulate the video hardware of the machine.
+
+***************************************************************************/
+
+#include "driver.h"
+
+UINT8 *hyperspt_scroll;
+
+static tilemap *bg_tilemap;
+
+/***************************************************************************
+
+ Convert the color PROMs into a more useable format.
+
+ Hyper Sports has one 32x8 palette PROM and two 256x4 lookup table PROMs
+ (one for characters, one for sprites).
+ The palette PROM is connected to the RGB output this way:
+
+ bit 7 -- 220 ohm resistor -- BLUE
+ -- 470 ohm resistor -- BLUE
+ -- 220 ohm resistor -- GREEN
+ -- 470 ohm resistor -- GREEN
+ -- 1 kohm resistor -- GREEN
+ -- 220 ohm resistor -- RED
+ -- 470 ohm resistor -- RED
+ bit 0 -- 1 kohm resistor -- RED
+
+***************************************************************************/
+PALETTE_INIT( hyperspt )
+{
+ int i;
+ #define TOTAL_COLORS(gfxn) (machine->gfx[gfxn]->total_colors * machine->gfx[gfxn]->color_granularity)
+ #define COLOR(gfxn,offs) (colortable[machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
+
+
+ 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_set_color(machine,i,MAKE_RGB(r,g,b));
+ color_prom++;
+ }
+
+ /* color_prom now points to the beginning of the lookup table */
+
+
+ /* sprites */
+ for (i = 0;i < TOTAL_COLORS(1);i++)
+ COLOR(1,i) = *(color_prom++) & 0x0f;
+
+ /* characters */
+ for (i = 0;i < TOTAL_COLORS(0);i++)
+ COLOR(0,i) = (*(color_prom++) & 0x0f) + 0x10;
+}
+
+WRITE8_HANDLER( hyperspt_videoram_w )
+{
+ videoram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( hyperspt_colorram_w )
+{
+ colorram[offset] = data;
+ tilemap_mark_tile_dirty(bg_tilemap, offset);
+}
+
+WRITE8_HANDLER( hyperspt_flipscreen_w )
+{
+ if (flip_screen != (data & 0x01))
+ {
+ flip_screen_set(data & 0x01);
+ tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
+ }
+}
+
+static TILE_GET_INFO( get_bg_tile_info )
+{
+ int code = videoram[tile_index] + ((colorram[tile_index] & 0x80) << 1) + ((colorram[tile_index] & 0x40) << 3);
+ int color = colorram[tile_index] & 0x0f;
+ int flags = ((colorram[tile_index] & 0x10) ? TILE_FLIPX : 0) | ((colorram[tile_index] & 0x20) ? TILE_FLIPY : 0);
+
+ SET_TILE_INFO(0, code, color, flags);
+}
+
+VIDEO_START( hyperspt )
+{
+ bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 64, 32);
+
+ tilemap_set_scroll_rows(bg_tilemap, 32);
+}
+
+static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect )
+{
+ int offs;
+
+ for (offs = spriteram_size - 4;offs >= 0;offs -= 4)
+ {
+ int sx = spriteram[offs + 3];
+ int sy = 240 - spriteram[offs + 1];
+ int flipx = ~spriteram[offs] & 0x40;
+ int flipy = spriteram[offs] & 0x80;
+
+ if (flip_screen)
+ {
+ sy = 240 - sy;
+ flipy = !flipy;
+ }
+
+ /* Note that this adjustment must be done AFTER handling flip_screen, thus */
+ /* proving that this is a hardware related "feature" */
+
+ sy += 1;
+
+ drawgfx(bitmap,machine->gfx[1],
+ spriteram[offs + 2] + 8 * (spriteram[offs] & 0x20),
+ spriteram[offs] & 0x0f,
+ flipx, flipy,
+ sx, sy,
+ cliprect,
+ TRANSPARENCY_COLOR, 0);
+
+ /* redraw with wraparound */
+
+ drawgfx(bitmap,machine->gfx[1],
+ spriteram[offs + 2] + 8 * (spriteram[offs] & 0x20),
+ spriteram[offs] & 0x0f,
+ flipx, flipy,
+ sx - 256, sy,
+ cliprect,
+ TRANSPARENCY_COLOR, 0);
+ }
+}
+
+VIDEO_UPDATE( hyperspt )
+{
+ int row;
+
+ for (row = 0; row < 32; row++)
+ {
+ int scrollx = hyperspt_scroll[row * 2] + (hyperspt_scroll[(row * 2) + 1] & 0x01) * 256;
+ if (flip_screen) scrollx = -scrollx;
+ tilemap_set_scrollx(bg_tilemap, row, scrollx);
+ }
+
+ tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
+ draw_sprites(machine, bitmap, cliprect);
+ return 0;
+}
+
+/* Road Fighter */
+
+static TILE_GET_INFO( roadf_get_bg_tile_info )
+{
+ int code = videoram[tile_index] + ((colorram[tile_index] & 0x80) << 1) + ((colorram[tile_index] & 0x60) << 4);
+ int color = colorram[tile_index] & 0x0f;
+ int flags = (colorram[tile_index] & 0x10) ? TILE_FLIPX : 0;
+
+ SET_TILE_INFO(0, code, color, flags);
+}
+
+VIDEO_START( roadf )
+{
+ bg_tilemap = tilemap_create(roadf_get_bg_tile_info, tilemap_scan_rows,
+ TILEMAP_TYPE_PEN, 8, 8, 64, 32);
+
+ tilemap_set_scroll_rows(bg_tilemap, 32);
+}