/*************************************************************************** video.c Functions to emulate the video hardware of the machine. ***************************************************************************/ #include "emu.h" #include "includes/snk6502.h" #define TOTAL_COLORS(m,gfxn) ((m).gfx[gfxn]->total_colors * (m).gfx[gfxn]->color_granularity) #define COLOR(m,gfxn,offs) ((m).config().m_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( snk6502 ) { snk6502_state *state = machine.driver_data(); int i; for (i = 0; i < machine.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; state->m_palette[i] = MAKE_RGB(r, g, b); color_prom++; } state->m_backcolor = 0; /* background color can be changed by the game */ for (i = 0; i < TOTAL_COLORS(machine,0); i++) palette_set_color(machine, COLOR(machine, 0, i), state->m_palette[i]); for (i = 0; i < TOTAL_COLORS(machine,1); i++) { if (i % 4 == 0) palette_set_color(machine, COLOR(machine, 1, i), state->m_palette[4 * state->m_backcolor + 0x20]); else palette_set_color(machine, COLOR(machine, 1, i), state->m_palette[i + 0x20]); } } WRITE8_HANDLER( snk6502_videoram_w ) { snk6502_state *state = space->machine().driver_data(); state->m_videoram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); } WRITE8_HANDLER( snk6502_videoram2_w ) { snk6502_state *state = space->machine().driver_data(); state->m_videoram2[offset] = data; tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( snk6502_colorram_w ) { snk6502_state *state = space->machine().driver_data(); state->m_colorram[offset] = data; tilemap_mark_tile_dirty(state->m_bg_tilemap, offset); tilemap_mark_tile_dirty(state->m_fg_tilemap, offset); } WRITE8_HANDLER( snk6502_charram_w ) { snk6502_state *state = space->machine().driver_data(); if (state->m_charram[offset] != data) { state->m_charram[offset] = data; gfx_element_mark_dirty(space->machine().gfx[0], (offset/8) % 256); } } WRITE8_HANDLER( snk6502_flipscreen_w ) { snk6502_state *state = space->machine().driver_data(); int bank; /* bits 0-2 select background color */ if (state->m_backcolor != (data & 7)) { int i; state->m_backcolor = data & 7; for (i = 0;i < 32;i += 4) palette_set_color(space->machine(), COLOR(space->machine(), 1, i), state->m_palette[4 * state->m_backcolor + 0x20]); } /* bit 3 selects char bank */ bank = (~data & 0x08) >> 3; if (state->m_charbank != bank) { state->m_charbank = bank; tilemap_mark_all_tiles_dirty_all(space->machine()); } /* bit 7 flips screen */ if (flip_screen_get(space->machine()) != (data & 0x80)) { flip_screen_set(space->machine(), data & 0x80); tilemap_mark_all_tiles_dirty_all(space->machine()); } } WRITE8_HANDLER( snk6502_scrollx_w ) { snk6502_state *state = space->machine().driver_data(); tilemap_set_scrollx(state->m_bg_tilemap, 0, data); } WRITE8_HANDLER( snk6502_scrolly_w ) { snk6502_state *state = space->machine().driver_data(); tilemap_set_scrolly(state->m_bg_tilemap, 0, data); } static TILE_GET_INFO( get_bg_tile_info ) { snk6502_state *state = machine.driver_data(); int code = state->m_videoram[tile_index] + 256 * state->m_charbank; int color = (state->m_colorram[tile_index] & 0x38) >> 3; SET_TILE_INFO(1, code, color, 0); } static TILE_GET_INFO( get_fg_tile_info ) { snk6502_state *state = machine.driver_data(); int code = state->m_videoram2[tile_index]; int color = state->m_colorram[tile_index] & 0x07; SET_TILE_INFO(0, code, color, 0); } VIDEO_START( snk6502 ) { snk6502_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); tilemap_set_transparent_pen(state->m_fg_tilemap, 0); gfx_element_set_source(machine.gfx[0], state->m_charram); } VIDEO_START( pballoon ) { snk6502_state *state = machine.driver_data(); VIDEO_START_CALL( snk6502 ); tilemap_set_scrolldy(state->m_bg_tilemap, -24, 0); tilemap_set_scrolldy(state->m_fg_tilemap, -24, 0); } SCREEN_UPDATE( snk6502 ) { snk6502_state *state = screen->machine().driver_data(); tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0); tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0); return 0; } /* Satan of Saturn */ PALETTE_INIT( satansat ) { snk6502_state *state = machine.driver_data(); int i; for (i = 0; i < machine.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; state->m_palette[i] = MAKE_RGB(r, g, b); color_prom++; } state->m_backcolor = 0; /* background color can be changed by the game */ for (i = 0; i < TOTAL_COLORS(machine,0); i++) palette_set_color(machine, COLOR(machine, 0, i), state->m_palette[4 * (i % 4) + (i / 4)]); for (i = 0; i < TOTAL_COLORS(machine,1); i++) { if (i % 4 == 0) palette_set_color(machine, COLOR(machine, 1, i), state->m_palette[state->m_backcolor + 0x10]); else palette_set_color(machine, COLOR(machine, 1, i), state->m_palette[4 * (i % 4) + (i / 4) + 0x10]); } } WRITE8_HANDLER( satansat_b002_w ) { snk6502_state *state = space->machine().driver_data(); /* bit 0 flips screen */ if (flip_screen_get(space->machine()) != (data & 0x01)) { flip_screen_set(space->machine(), data & 0x01); tilemap_mark_all_tiles_dirty_all(space->machine()); } /* bit 1 enables interrupts */ state->m_irq_mask = data & 2; /* other bits unused */ } WRITE8_HANDLER( satansat_backcolor_w ) { snk6502_state *state = space->machine().driver_data(); /* bits 0-1 select background color. Other bits unused. */ if (state->m_backcolor != (data & 0x03)) { int i; state->m_backcolor = data & 0x03; for (i = 0; i < 16; i += 4) palette_set_color(space->machine(), COLOR(space->machine(), 1, i), state->m_palette[state->m_backcolor + 0x10]); } } static TILE_GET_INFO( satansat_get_bg_tile_info ) { snk6502_state *state = machine.driver_data(); int code = state->m_videoram[tile_index]; int color = (state->m_colorram[tile_index] & 0x0c) >> 2; SET_TILE_INFO(1, code, color, 0); } static TILE_GET_INFO( satansat_get_fg_tile_info ) { snk6502_state *state = machine.driver_data(); int code = state->m_videoram2[tile_index]; int color = state->m_colorram[tile_index] & 0x03; SET_TILE_INFO(0, code, color, 0); } VIDEO_START( satansat ) { snk6502_state *state = machine.driver_data(); state->m_bg_tilemap = tilemap_create(machine, satansat_get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); state->m_fg_tilemap = tilemap_create(machine, satansat_get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32); tilemap_set_transparent_pen(state->m_fg_tilemap, 0); gfx_element_set_source(machine.gfx[0], state->m_charram); }