// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** Atari "Round" hardware ****************************************************************************/ #include "emu.h" #include "includes/relief.h" /************************************* * * Tilemap callbacks * *************************************/ TILE_GET_INFO_MEMBER(relief_state::get_playfield_tile_info) { uint16_t data1 = m_vad->playfield().basemem_read(tile_index); uint16_t data2 = m_vad->playfield().extmem_read(tile_index) & 0xff; int code = data1 & 0x7fff; int color = 0x20 + (data2 & 0x0f); SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1); } TILE_GET_INFO_MEMBER(relief_state::get_playfield2_tile_info) { uint16_t data1 = m_vad->playfield2().basemem_read(tile_index); uint16_t data2 = m_vad->playfield2().extmem_read(tile_index) >> 8; int code = data1 & 0x7fff; int color = data2 & 0x0f; SET_TILE_INFO_MEMBER(0, code, color, (data1 >> 15) & 1); } /************************************* * * Video system start * *************************************/ const atari_motion_objects_config relief_state::s_mob_config = { 1, /* index to which gfx system */ 1, /* number of motion object banks */ 1, /* are the entries linked? */ 0, /* are the entries split? */ 0, /* render in reverse order? */ 0, /* render in swapped X/Y order? */ 0, /* does the neighbor bit affect the next object? */ 8, /* pixels per SLIP entry (0 for no-slip) */ 0, /* pixel offset for SLIPs */ 0, /* maximum number of links to visit/scanline (0=all) */ 0x100, /* base palette entry */ 0x100, /* maximum number of colors */ 0, /* transparent pen index */ {{ 0x00ff,0,0,0 }}, /* mask for the link */ {{ 0,0x7fff,0,0 }}, /* mask for the code index */ {{ 0,0,0x000f,0 }}, /* mask for the color */ {{ 0,0,0xff80,0 }}, /* mask for the X position */ {{ 0,0,0,0xff80 }}, /* mask for the Y position */ {{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/ {{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */ {{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */ {{ 0 }}, /* mask for the vertical flip */ {{ 0 }}, /* mask for the priority */ {{ 0 }}, /* mask for the neighbor */ {{ 0 }}, /* mask for absolute coordinates */ {{ 0 }}, /* mask for the special value */ 0 /* resulting value to indicate "special" */ }; void relief_state::video_start() { /* MOs are 5bpp but with a 4-bit color granularity */ m_gfxdecode->gfx(1)->set_granularity(16); } /************************************* * * Main refresh * *************************************/ uint32_t relief_state::screen_update_relief(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { // start drawing m_vad->mob().draw_async(cliprect); /* draw the playfield */ bitmap_ind8 &priority_bitmap = screen.priority(); priority_bitmap.fill(0, cliprect); m_vad->playfield().draw(screen, bitmap, cliprect, 0, 0); m_vad->playfield2().draw(screen, bitmap, cliprect, 0, 1); // draw and merge the MO bitmap_ind16 &mobitmap = m_vad->mob().bitmap(); for (const sparse_dirty_rect *rect = m_vad->mob().first_dirty_rect(cliprect); rect != nullptr; rect = rect->next()) for (int y = rect->top(); y <= rect->bottom(); y++) { uint16_t *mo = &mobitmap.pix16(y); uint16_t *pf = &bitmap.pix16(y); uint8_t *pri = &priority_bitmap.pix8(y); for (int x = rect->left(); x <= rect->right(); x++) if (mo[x] != 0xffff) { /* verified from the GALs on the real PCB; equations follow * * --- PF/M is 1 if playfield has priority, or 0 if MOs have priority * PF/M = PFXS * * --- CS0 is set to 1 if the MO is transparent * CS0=!MPX0*!MPX1*!MPX2*!MPX3 * * --- CS1 is 1 to select playfield pixels or 0 to select MO pixels * !CS1=MPX5*MPX6*MPX7*!CS0 * +!MPX4*MPX5*MPX6*MPX7 * +PFXS*!CS0 * +!MPX4*PFXS * * --- CRA10 is the 0x200 bit of the color RAM index; set for the top playfield only * CRA10:=CS1*PFXS * * --- CRA9 is the 0x100 bit of the color RAM index; set for MOs only * !CA9:=CS1 * * --- CRA8-1 are the low 8 bits of the color RAM index; set as expected */ int cs0 = 0; int cs1 = 1; /* compute the CS0 signal */ cs0 = ((mo[x] & 0x0f) == 0); /* compute the CS1 signal */ if ((!cs0 && (mo[x] & 0xe0) == 0xe0) || ((mo[x] & 0xf0) == 0xe0) || (!pri[x] && !cs0) || (!pri[x] && !(mo[x] & 0x10))) cs1 = 0; /* MO is displayed if cs1 == 0 */ if (!cs1) pf[x] = mo[x]; } } return 0; }