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igt/gkigt.cpp: partial decoding of CG ROM regions
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This commit is contained in:
angelosa 2024-09-28 00:51:18 +02:00
parent 9c54072486
commit 2eac570af8
1 changed files with 45 additions and 29 deletions
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74
src/mame/igt/gkigt.cpp
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@ -103,16 +103,17 @@ More chips (from eBay auction):
*/
#include "emu.h"
#include "bus/rs232/rs232.h"
#include "cpu/i960/i960.h"
#include "machine/mc68681.h"
#include "machine/nvram.h"
#include "video/ramdac.h"
#include "sound/ymz280b.h"
#include "bus/rs232/rs232.h"
#include "video/ramdac.h"
#include "emupal.h"
#include "screen.h"
#include "speaker.h"
#include "tilemap.h"
namespace {
@ -125,6 +126,8 @@ public:
, m_palette(*this, "palette")
, m_screen(*this, "screen")
, m_vram(*this, "vram")
, m_bg_vram(*this, "bg_vram")
, m_gfxdecode(*this, "gfxdecode")
, m_quart(*this, "quart%u", 1U)
{ }
@ -138,7 +141,7 @@ private:
virtual void machine_start() override ATTR_COLD;
virtual void machine_reset() override ATTR_COLD;
uint16_t version_r();
[[maybe_unused]] uint16_t version_r();
void igt_gameking_map(address_map &map) ATTR_COLD;
void igt_ms72c_map(address_map &map) ATTR_COLD;
@ -148,33 +151,42 @@ private:
required_device<palette_device> m_palette;
required_device<screen_device> m_screen;
required_shared_ptr<uint32_t> m_vram;
required_shared_ptr<uint32_t> m_bg_vram;
required_device<gfxdecode_device> m_gfxdecode;
required_device_array<sc28c94_device, 2> m_quart;
tilemap_t *m_bg_tilemap = nullptr;
TILE_GET_INFO_MEMBER(get_bg_tile_info);
void bg_vram_w(offs_t offset, u32 data, u32 mem_mask = ~0);
};
void igt_gameking_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(igt_gameking_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 4, 4, 256, 128);
}
TILE_GET_INFO_MEMBER(igt_gameking_state::get_bg_tile_info)
{
const u32 entry = m_bg_vram[tile_index];
int const tile = (entry & 0xffff) | (BIT(entry, 19) << 16);
int const color = (entry >> 24) & 0xf;
tileinfo.set(0, tile, color, 0);
}
void igt_gameking_state::bg_vram_w(offs_t offset, u32 data, u32 mem_mask)
{
COMBINE_DATA(&m_bg_vram[offset]);
m_bg_tilemap->mark_tile_dirty(offset);
}
uint32_t igt_gameking_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
bitmap.fill(m_palette->black_pen(), cliprect);
const u32 fg_base_offset = 0x100000;
for(int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for(int x = cliprect.min_x; x <= cliprect.max_x; x+=4)
{
// TODO: format is quite the mystery
// 15-8 / 7-0 color cluts, 31-16 fill mask?
const u32 gfx_data = m_vram[(fg_base_offset + x + (y >> 2) * 1024) / 4];
uint32_t const color = (gfx_data >> (8)) & 0xff;
for(int xi = 0; xi < 4; xi++)
{
bitmap.pix(y, x+xi) = m_palette->pen(color);
}
}
}
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
for(int y = cliprect.min_y; y <= cliprect.max_y; y++)
{
@ -209,7 +221,11 @@ void igt_gameking_state::igt_gameking_map(address_map &map)
map(0x10000000, 0x1001ffff).flags(i960_cpu_device::BURST).ram().share("nvram");
map(0x10020000, 0x17ffffff).flags(i960_cpu_device::BURST).ram();
map(0x18000000, 0x181fffff).flags(i960_cpu_device::BURST).ram().share("vram"); // igtsc writes from 18000000 to 1817ffff, ms3 all the way to 181fffff.
// igtsc writes from 18000000 to 1817ffff, ms3 all the way to 181fffff.
map(0x18000000, 0x180fffff).flags(i960_cpu_device::BURST).ram().share("vram");
map(0x18100000, 0x1811ffff).flags(i960_cpu_device::BURST).ram().w(FUNC(igt_gameking_state::bg_vram_w)).share("bg_vram");
map(0x18120000, 0x181fffff).ram();
// map(0x18200000, 0x18200003) video related?
map(0x18200000, 0x18200001).lr16(
NAME([this] () {
@ -255,7 +271,7 @@ uint16_t igt_gameking_state::version_r()
void igt_gameking_state::igt_ms72c_map(address_map &map)
{
igt_gameking_map(map);
map(0x18200000, 0x18200001).r(FUNC(igt_gameking_state::version_r));
// map(0x18200000, 0x18200001).r(FUNC(igt_gameking_state::version_r));
}
static INPUT_PORTS_START( igt_gameking )
@ -461,16 +477,16 @@ static INPUT_PORTS_START( igt_gameking )
INPUT_PORTS_END
// TODO: wrong decoding, gfxs inside have variable pitches (is this really decodable?)
// TODO: incomplete decoding
static const gfx_layout igt_gameking_layout =
{
16,8,
4,4,
RGN_FRAC(1,1),
4,
{ STEP4(0, 1) },
{ STEP16(0, 4) },
{ STEP8(0, 4*16) },
16*8*4
{ 0, 1, 2, 3 },
{ 4, 0, 12, 8 },
{ STEP4(0, 4*4) },
4*4*4
};
static GFXDECODE_START( gfx_igt_gameking )
@ -530,7 +546,7 @@ void igt_gameking_state::igt_gameking(machine_config &config)
ramdac_device &ramdac(RAMDAC(config, "ramdac", 0, m_palette));
ramdac.set_addrmap(0, &igt_gameking_state::ramdac_map);
GFXDECODE(config, "gfxdecode", m_palette, gfx_igt_gameking);
GFXDECODE(config, m_gfxdecode, m_palette, gfx_igt_gameking);
/* sound hardware */
SPEAKER(config, "mono").front_center();