/*************************************************************************** video.c Written by Kenneth Lin (kenneth_lin@ai.vancouver.bc.ca) Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/jackal.h" PALETTE_INIT( jackal ) { int i; /* allocate the colortable */ machine.colortable = colortable_alloc(machine, 0x200); for (i = 0; i < 0x100; i++) { UINT16 ctabentry = i | 0x100; colortable_entry_set_value(machine.colortable, i, ctabentry); } for (i = 0x100; i < 0x200; i++) { UINT16 ctabentry = color_prom[i - 0x100] & 0x0f; colortable_entry_set_value(machine.colortable, i, ctabentry); } for (i = 0x200; i < 0x300; i++) { UINT16 ctabentry = (color_prom[i - 0x100] & 0x0f) | 0x10; colortable_entry_set_value(machine.colortable, i, ctabentry); } } static void set_pens( running_machine &machine ) { jackal_state *state = machine.driver_data(); int i; for (i = 0; i < 0x400; i += 2) { UINT16 data = state->m_paletteram[i] | (state->m_paletteram[i | 1] << 8); rgb_t color = MAKE_RGB(pal5bit(data >> 0), pal5bit(data >> 5), pal5bit(data >> 10)); colortable_palette_set_color(machine.colortable, i >> 1, color); } } void jackal_mark_tile_dirty( running_machine &machine, int offset ) { jackal_state *state = machine.driver_data(); tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } static TILE_GET_INFO( get_bg_tile_info ) { UINT8 *RAM = machine.region("master")->base(); int attr = RAM[0x2000 + tile_index]; int code = RAM[0x2400 + tile_index] + ((attr & 0xc0) << 2) + ((attr & 0x30) << 6); int color = 0;//attr & 0x0f; int flags = ((attr & 0x10) ? TILE_FLIPX : 0) | ((attr & 0x20) ? TILE_FLIPY : 0); SET_TILE_INFO(0, code, color, flags); } VIDEO_START( jackal ) { jackal_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); } static void draw_background( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { jackal_state *state = machine.driver_data(); UINT8 *RAM = machine.region("master")->base(); int i; state->m_scrollram = &RAM[0x0020]; tilemap_set_scroll_rows(state->m_bg_tilemap, 1); tilemap_set_scroll_cols(state->m_bg_tilemap, 1); tilemap_set_scrolly(state->m_bg_tilemap, 0, state->m_videoctrl[0]); tilemap_set_scrollx(state->m_bg_tilemap, 0, state->m_videoctrl[1]); if (state->m_videoctrl[2] & 0x02) { if (state->m_videoctrl[2] & 0x08) { tilemap_set_scroll_rows(state->m_bg_tilemap, 32); for (i = 0; i < 32; i++) tilemap_set_scrollx(state->m_bg_tilemap, i, state->m_scrollram[i]); } if (state->m_videoctrl[2] & 0x04) { tilemap_set_scroll_cols(state->m_bg_tilemap, 32); for (i = 0; i < 32; i++) tilemap_set_scrolly(state->m_bg_tilemap, i, state->m_scrollram[i]); } } tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); } #define DRAW_SPRITE(bank, code, sx, sy) drawgfx_transpen(bitmap, cliprect, machine.gfx[bank], code, color, flipx, flipy, sx, sy, 0); static void draw_sprites_region( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect, const UINT8 *sram, int length, int bank ) { int offs; for (offs = 0; offs < length; offs += 5) { int sn1 = sram[offs]; int sn2 = sram[offs + 1]; int sy = sram[offs + 2]; int sx = sram[offs + 3]; int attr = sram[offs + 4]; int flipx = attr & 0x20; int flipy = attr & 0x40; int color = ((sn2 & 0xf0) >> 4); if (attr & 0x01) sx = sx - 256; if (sy > 0xf0) sy = sy - 256; if (flip_screen_get(machine)) { sx = 240 - sx; sy = 240 - sy; flipx = !flipx; flipy = !flipy; } if (attr & 0xC) // half-size sprite { int spritenum = sn1 * 4 + ((sn2 & (8 + 4)) >> 2) + ((sn2 & (2 + 1)) << 10); int mod = -8; if (flip_screen_get(machine)) { sx += 8; sy -= 8; mod = 8; } if ((attr & 0x0C) == 0x0C) { if (flip_screen_get(machine)) sy += 16; DRAW_SPRITE(bank + 1, spritenum, sx, sy) } if ((attr & 0x0C) == 0x08) { sy += 8; DRAW_SPRITE(bank + 1, spritenum, sx, sy) DRAW_SPRITE(bank + 1, spritenum - 2, sx, sy + mod) } if ((attr & 0x0C) == 0x04) { DRAW_SPRITE(bank + 1, spritenum, sx, sy) DRAW_SPRITE(bank + 1, spritenum + 1, sx + mod, sy) } } else { int spritenum = sn1 + ((sn2 & 0x03) << 8); if (attr & 0x10) { if (flip_screen_get(machine)) { sx -= 16; sy -= 16; } DRAW_SPRITE(bank, spritenum, flipx ? sx+16 : sx, flipy ? sy+16 : sy) DRAW_SPRITE(bank, spritenum + 1, flipx ? sx : sx+16, flipy ? sy+16 : sy) DRAW_SPRITE(bank, spritenum + 2, flipx ? sx+16 : sx, flipy ? sy : sy+16) DRAW_SPRITE(bank, spritenum + 3, flipx ? sx : sx+16, flipy ? sy : sy+16) } else { DRAW_SPRITE(bank, spritenum, sx, sy) } } } } static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect ) { jackal_state *state = machine.driver_data(); UINT8 *RAM = machine.region("master")->base(); UINT8 *sr, *ss; if (state->m_videoctrl[0x03] & 0x08) { sr = &RAM[0x03800]; // Sprite 2 ss = &RAM[0x13800]; // Additional Sprite 2 } else { sr = &RAM[0x03000]; // Sprite 1 ss = &RAM[0x13000]; // Additional Sprite 1 } draw_sprites_region(machine, bitmap, cliprect, ss, 0x0f5, 3); draw_sprites_region(machine, bitmap, cliprect, sr, 0x500, 1); } SCREEN_UPDATE( jackal ) { set_pens(screen->machine()); draw_background(screen->machine(), bitmap, cliprect); draw_sprites(screen->machine(), bitmap, cliprect); return 0; }