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https://github.com/holub/mame
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machine/vsnes.cpp: Simplified nametable mirroring. (#9226)
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0kmg
GitHub
parent
64c9f31bc7
commit
d41dffbef7
@ -74,10 +74,6 @@ private:
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uint8_t vsnes_in0_1_r();
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uint8_t vsnes_in1_1_r();
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uint8_t gun_in0_r();
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void vsnes_nt0_w(offs_t offset, uint8_t data);
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void vsnes_nt1_w(offs_t offset, uint8_t data);
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uint8_t vsnes_nt0_r(offs_t offset);
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uint8_t vsnes_nt1_r(offs_t offset);
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void vsnormal_vrom_banking(uint8_t data);
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void gun_in0_w(uint8_t data);
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void vskonami_rom_banking(offs_t offset, uint8_t data);
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@ -97,7 +93,6 @@ private:
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void vsdual_vrom_banking_main(uint8_t data);
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void vsdual_vrom_banking_sub(uint8_t data);
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void vssmbbl_sn_w(offs_t offset, uint8_t data);
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void v_set_mirroring(int ppu, int mirroring);
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DECLARE_MACHINE_START(vsnes);
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DECLARE_MACHINE_RESET(vsnes);
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@ -127,7 +122,6 @@ private:
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uint8_t* m_vrom[2];
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std::unique_ptr<uint8_t[]> m_nt_ram[2];
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memory_bank_array_creator<8> m_bank_vrom;
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uint8_t* m_nt_page[2][4];
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uint32_t m_vrom_size[2];
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int m_vrom_banks;
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int m_zapstore;
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@ -161,7 +161,7 @@ MACHINE_RESET_MEMBER(vsnes_state,vsdual)
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*
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*************************************/
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void vsnes_state::v_set_videorom_bank( int start, int count, int vrom_start_bank )
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void vsnes_state::v_set_videorom_bank(int start, int count, int vrom_start_bank)
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{
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int i;
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@ -185,13 +185,9 @@ MACHINE_START_MEMBER(vsnes_state,vsnes)
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/* establish nametable ram */
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m_nt_ram[0] = std::make_unique<uint8_t[]>(0x1000);
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/* set mirroring */
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m_nt_page[0][0] = m_nt_ram[0].get();
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m_nt_page[0][1] = m_nt_ram[0].get() + 0x400;
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m_nt_page[0][2] = m_nt_ram[0].get() + 0x800;
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m_nt_page[0][3] = m_nt_ram[0].get() + 0xc00;
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ppu1_space.install_readwrite_handler(0x2000, 0x3eff, read8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt0_r)), write8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt0_w)));
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ppu1_space.install_ram(0x2000, 0x2fff, m_nt_ram[0].get());
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ppu1_space.install_ram(0x3000, 0x3eff, m_nt_ram[0].get());
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if (m_gfx1_rom != nullptr)
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{
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@ -234,18 +230,12 @@ MACHINE_START_MEMBER(vsnes_state,vsdual)
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/* establish nametable ram */
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m_nt_ram[0] = std::make_unique<uint8_t[]>(0x1000);
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m_nt_ram[1] = std::make_unique<uint8_t[]>(0x1000);
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/* set mirroring */
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m_nt_page[0][0] = m_nt_ram[0].get();
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m_nt_page[0][1] = m_nt_ram[0].get() + 0x400;
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m_nt_page[0][2] = m_nt_ram[0].get() + 0x800;
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m_nt_page[0][3] = m_nt_ram[0].get() + 0xc00;
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m_nt_page[1][0] = m_nt_ram[1].get();
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m_nt_page[1][1] = m_nt_ram[1].get() + 0x400;
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m_nt_page[1][2] = m_nt_ram[1].get() + 0x800;
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m_nt_page[1][3] = m_nt_ram[1].get() + 0xc00;
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m_ppu1->space(AS_PROGRAM).install_readwrite_handler(0x2000, 0x3eff, read8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt0_r)), write8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt0_w)));
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m_ppu2->space(AS_PROGRAM).install_readwrite_handler(0x2000, 0x3eff, read8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt1_r)), write8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt1_w)));
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m_ppu1->space(AS_PROGRAM).install_ram(0x2000, 0x2fff, m_nt_ram[0].get());
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m_ppu1->space(AS_PROGRAM).install_ram(0x3000, 0x3eff, m_nt_ram[0].get());
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m_ppu2->space(AS_PROGRAM).install_ram(0x2000, 0x2fff, m_nt_ram[1].get());
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m_ppu2->space(AS_PROGRAM).install_ram(0x3000, 0x3eff, m_nt_ram[1].get());
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// read only!
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m_ppu1->space(AS_PROGRAM).install_read_bank(0x0000, 0x1fff, m_bank_vrom[0]);
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// read only!
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@ -261,11 +251,11 @@ MACHINE_START_MEMBER(vsnes_state, bootleg)
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address_space &ppu1_space = m_ppu1->space(AS_PROGRAM);
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/* establish nametable ram */
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m_nt_ram[0] = std::make_unique<uint8_t[]>(0x1000);
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/* set mirroring */
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v_set_mirroring(0, PPU_MIRROR_VERT);
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m_nt_ram[0] = std::make_unique<uint8_t[]>(0x800);
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ppu1_space.install_readwrite_handler(0x2000, 0x3eff, read8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt0_r)), write8sm_delegate(*this, FUNC(vsnes_state::vsnes_nt0_w)));
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ppu1_space.install_ram(0x2000, 0x27ff, 0x800, m_nt_ram[0].get());
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ppu1_space.install_ram(0x3000, 0x37ff, m_nt_ram[0].get());
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ppu1_space.install_ram(0x3800, 0x3eff, m_nt_ram[0].get());
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m_vrom[0] = m_gfx1_rom->base();
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m_vrom_size[0] = m_gfx1_rom->bytes();
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@ -277,69 +267,6 @@ MACHINE_START_MEMBER(vsnes_state, bootleg)
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m_bank_vrom[0]->set_entry(0);
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}
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/*************************************
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*
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* External mappings for PPU bus
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*
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*************************************/
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void vsnes_state::vsnes_nt0_w(offs_t offset, uint8_t data)
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{
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int page = ((offset & 0xc00) >> 10);
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m_nt_page[0][page][offset & 0x3ff] = data;
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}
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void vsnes_state::vsnes_nt1_w(offs_t offset, uint8_t data)
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{
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int page = ((offset & 0xc00) >> 10);
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m_nt_page[1][page][offset & 0x3ff] = data;
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}
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uint8_t vsnes_state::vsnes_nt0_r(offs_t offset)
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{
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int page = ((offset&0xc00) >> 10);
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return m_nt_page[0][page][offset & 0x3ff];
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}
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uint8_t vsnes_state::vsnes_nt1_r(offs_t offset)
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{
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int page = ((offset & 0xc00) >> 10);
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return m_nt_page[1][page][offset & 0x3ff];
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}
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void vsnes_state::v_set_mirroring(int ppu, int mirroring)
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{
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switch (mirroring)
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{
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case PPU_MIRROR_LOW:
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m_nt_page[ppu][0] = m_nt_page[ppu][1] = m_nt_page[ppu][2] = m_nt_page[ppu][3] = m_nt_ram[ppu].get();
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break;
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case PPU_MIRROR_HIGH:
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m_nt_page[ppu][0] = m_nt_page[ppu][1] = m_nt_page[ppu][2] = m_nt_page[ppu][3] = m_nt_ram[ppu].get() + 0x400;
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break;
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case PPU_MIRROR_HORZ:
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m_nt_page[ppu][0] = m_nt_ram[ppu].get();
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m_nt_page[ppu][1] = m_nt_ram[ppu].get();
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m_nt_page[ppu][2] = m_nt_ram[ppu].get() + 0x400;
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m_nt_page[ppu][3] = m_nt_ram[ppu].get() + 0x400;
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break;
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case PPU_MIRROR_VERT:
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m_nt_page[ppu][0] = m_nt_ram[ppu].get();
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m_nt_page[ppu][1] = m_nt_ram[ppu].get() + 0x400;
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m_nt_page[ppu][2] = m_nt_ram[ppu].get();
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m_nt_page[ppu][3] = m_nt_ram[ppu].get() + 0x400;
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break;
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case PPU_MIRROR_NONE:
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default:
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m_nt_page[ppu][0] = m_nt_ram[ppu].get();
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m_nt_page[ppu][1] = m_nt_ram[ppu].get() + 0x400;
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m_nt_page[ppu][2] = m_nt_ram[ppu].get() + 0x800;
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m_nt_page[ppu][3] = m_nt_ram[ppu].get() + 0xc00;
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break;
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}
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}
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/**********************************************************************************
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*
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* Game and Board-specific initialization
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@ -561,34 +488,10 @@ void vsnes_state::drmario_rom_banking(offs_t offset, uint8_t data)
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{
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case 0: /* mirroring and options */
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{
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int mirroring;
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m_vrom4k = m_drmario_shiftreg & 0x10;
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m_size16k = m_drmario_shiftreg & 0x08;
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m_switchlow = m_drmario_shiftreg & 0x04;
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switch (m_drmario_shiftreg & 3)
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{
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case 0:
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mirroring = PPU_MIRROR_LOW;
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break;
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case 1:
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mirroring = PPU_MIRROR_HIGH;
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break;
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case 2:
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mirroring = PPU_MIRROR_VERT;
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break;
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default:
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case 3:
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mirroring = PPU_MIRROR_HORZ;
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break;
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}
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/* apply mirroring */
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v_set_mirroring(1, mirroring);
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// 0x03: mirroring bits unused on VS
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}
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break;
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