// license:BSD-3-Clause // copyright-holders:Bryan McPhail /************************************************************************* deco_ace.cpp Data East 99 "ACE" Chip Emulation Original source (from deco32.cpp) by Bryan McPhail, Splited by cam900. **************************************************************************/ /*Some notes pieced together from Tattoo Assassins info(from deco32.cpp): Bytes 0 to 0x1f : Alpha Control Tattoo Assassins : Bytes 0x00 to 0x07(0x1c) - object alpha control per palette/priority / 8 Bytes 0x08(0x20) to 0x16(0x58) - used, unknown condition/purpose (possibly object) Bytes 0x17(0x5c) to 0x1f(0x7c) - tilemap alpha control Night slashers : Bytes 0x00 to 0x05(0x14) - object alpha control per palette / 2 (if ((pix & 0x900) != 0x100)) Bytes 0x06(0x18) to 0x16(0x58) - unused/unknown Bytes 0x17(0x5c) to 0x1f(0x7c) - tilemap alpha control Boogie Wings: Bytes 0x00 to 0x0f(0x1f) - object alpha control per palette bank (if ((pix & 0x900) == 0)) Bytes 0x10(0x20) to 0x11(0x26) - object alpha control per palette bit 3 (if ((pix & 0x900) == 0x100)) Bytes 0x12(0x20) to 0x13(0x26) - object alpha control per palette bit 3 (if ((pix & 0x900) == 0x800)) Bytes 0x14(0x28) to 0x19(0x32) - object alpha control per pixel (if ((pix & 0x900) == 0x900)) Bytes 0x1a(0x34) to 0x1e(0x3c) - unused/unknown Bytes 0x1f(0x3e) - 2nd tilemap chip, 'tilemap_1' alpha control, used at shadowing 0 = opaque, 0x10 = 50% transparent, 0x20 = fully transparent (doesn't make sense bitwise -AS), 0x22 = stage 1 boss dark effect in Boogie Wings (incorrectly emulated, reverses source pixel + shifts down by 1? -AS) 0x21/0x1000 = used,unknown (by what!? -AS) Byte 0x00: ACEO000P0 P8 1P0 1P8 O010C1 o010C8 ?? Hardware fade registers: Byte 0x20(0x80): fadeptred Byte 0x21(0x84): fadeptgreen Byte 0x22(0x88): fadeptblue Byte 0x23(0x8c): fadestred Byte 0x24(0x90): fadestgreen Byte 0x25(0x94): fadestblue Byte 0x26(0x98): fadetype Byte 0x27(0x9c): unused/unknown The 'ST' value lerps between the 'PT' value and the palette entries. So, if PT==0, then ST ranging from 0 to 255 will cause a fade to black (when ST==255 the palette becomes zero). 'fadetype' - 1100 for multiplicative fade, 1000 for additive TODO: additive fade is correct? verify additive fading from real pcb. */ #include "emu.h" #include "video/deco_ace.h" #include DEFINE_DEVICE_TYPE(DECO_ACE, deco_ace_device, "deco_ace", "Data East 99 'ACE' Chip") deco_ace_device::deco_ace_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, DECO_ACE, tag, owner, clock), device_video_interface(mconfig, *this), device_palette_interface(mconfig, *this), m_paletteram(nullptr), m_paletteram_buffered(nullptr), m_ace_ram(nullptr) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void deco_ace_device::device_start() { m_paletteram = make_unique_clear(2048); m_paletteram_buffered = make_unique_clear(2048); m_ace_ram = make_unique_clear(0x28); save_pointer(NAME(m_paletteram), 2048); save_pointer(NAME(m_paletteram_buffered), 2048); save_pointer(NAME(m_ace_ram), 0x28); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void deco_ace_device::device_reset() { memset(m_ace_ram.get(),0,0x28); } //------------------------------------------------- // device_post_load - device-specific post-load //------------------------------------------------- void deco_ace_device::device_post_load() { palette_update(); } /***************************************************************************** DEVICE HANDLERS *****************************************************************************/ /* Games have double buffered paletteram - the real palette ram is only updated on a DMA call */ // nslasher uint32_t deco_ace_device::buffered_palette_r(offs_t offset) { return m_paletteram[offset]; } void deco_ace_device::buffered_palette_w(offs_t offset, uint32_t data, uint32_t mem_mask) { COMBINE_DATA(&m_paletteram[offset]); } // boogwing has 16 bit cpu data bus(M68000 Based) uint16_t deco_ace_device::buffered_palette16_r(offs_t offset) { if ((offset & 1) == 0) return (m_paletteram[offset >> 1] >> 16) & 0xffff; else return m_paletteram[offset >> 1] & 0xffff; } void deco_ace_device::buffered_palette16_w(offs_t offset, uint16_t data, uint16_t mem_mask) { if ((offset & 1) == 0) m_paletteram[offset >> 1] = (m_paletteram[offset >> 1] & ~(mem_mask<<16)) | ((data & mem_mask)<<16); else m_paletteram[offset >> 1] = (m_paletteram[offset >> 1] & ~mem_mask) | (data & mem_mask); } uint16_t deco_ace_device::ace_r(offs_t offset) { return m_ace_ram[offset]; } void deco_ace_device::ace_w(offs_t offset, uint16_t data, uint16_t mem_mask) { COMBINE_DATA(&m_ace_ram[offset]); if ((offset >= 0x20) && (offset <= 0x26)) palette_update(); } void deco_ace_device::palette_update() { int fadeptr=m_ace_ram[0x20] & 0xff; int fadeptg=m_ace_ram[0x21] & 0xff; int fadeptb=m_ace_ram[0x22] & 0xff; int fadepsr=m_ace_ram[0x23] & 0xff; int fadepsg=m_ace_ram[0x24] & 0xff; int fadepsb=m_ace_ram[0x25] & 0xff; uint16_t mode=m_ace_ram[0x26] & 0xffff; for (int i = 0; i < 2048; i++) { /* Lerp palette entry to 'fadept' according to 'fadeps' */ int b = (m_paletteram_buffered[i] >>16) & 0xff; int g = (m_paletteram_buffered[i] >> 8) & 0xff; int r = (m_paletteram_buffered[i] >> 0) & 0xff; set_pen_color(i + 2048, rgb_t(r, g, b)); // raw palettes switch (mode) { default: case 0x1100: // multiplicative fade /* Yeah, this should really be fixed point, I know */ b = std::max(0, std::min(255, u8((b + (((fadeptb - b) * fadepsb) / 255))))); g = std::max(0, std::min(255, u8((g + (((fadeptg - g) * fadepsg) / 255))))); r = std::max(0, std::min(255, u8((r + (((fadeptr - r) * fadepsr) / 255))))); break; case 0x1000: // additive fade, correct? b = std::min(b + fadepsb, 0xff); g = std::min(g + fadepsg, 0xff); r = std::min(r + fadepsr, 0xff); break; } set_pen_color(i, rgb_t(r, g, b)); // faded palettes } } /************************************************************************* get_alpha : Get alpha value (ACE RAM Area 0x00 - 0x1f) *************************************************************************/ uint8_t deco_ace_device::get_alpha(uint8_t val) { val &= 0x1f; int alpha = m_ace_ram[val] & 0xff; if (alpha > 0x20) { return 0x80; // TODO : Special blending command? 0x21, 0x22, 0x1000 confirmed } else { alpha = 255 - (alpha << 3); if (alpha < 0) alpha = 0; return (uint8_t)alpha; } } /************************************************************************* get_aceram : Get ACE RAM value *************************************************************************/ uint16_t deco_ace_device::get_aceram(uint8_t val) { if (val >= 0x28) return 0; return m_ace_ram[val]; } void deco_ace_device::palette_dma_w(uint16_t data) { std::copy(&m_paletteram[0], &m_paletteram[2048], &m_paletteram_buffered[0]); palette_update(); } /*****************************************************************************************/