mirror of https://github.com/bsnes-emu/bsnes.git
427 lines
10 KiB
C++
427 lines
10 KiB
C++
#include <sfc/sfc.hpp>
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#define PPU_CPP
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namespace SuperFamicom {
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PPU ppu;
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#include "memory/memory.cpp"
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#include "mmio/mmio.cpp"
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#include "render/render.cpp"
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#include "serialization.cpp"
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void PPU::step(unsigned clocks) {
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clock += clocks;
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}
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void PPU::synchronize_cpu() {
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if(CPU::Threaded == true) {
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if(clock >= 0 && scheduler.sync != Scheduler::SynchronizeMode::All) co_switch(cpu.thread);
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} else {
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while(clock >= 0) cpu.enter();
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}
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}
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void PPU::Enter() { ppu.enter(); }
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void PPU::enter() {
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while(true) {
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if(scheduler.sync == Scheduler::SynchronizeMode::All) {
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scheduler.exit(Scheduler::ExitReason::SynchronizeEvent);
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}
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//H = 0 (initialize)
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scanline();
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add_clocks(10);
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//H = 10 (cache mode7 registers + OAM address reset)
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cache.m7_hofs = regs.m7_hofs;
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cache.m7_vofs = regs.m7_vofs;
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cache.m7a = regs.m7a;
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cache.m7b = regs.m7b;
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cache.m7c = regs.m7c;
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cache.m7d = regs.m7d;
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cache.m7x = regs.m7x;
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cache.m7y = regs.m7y;
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if(vcounter() == (!overscan() ? 225 : 240)) {
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if(regs.display_disabled == false) {
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regs.oam_addr = regs.oam_baseaddr << 1;
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regs.oam_firstsprite = (regs.oam_priority == false) ? 0 : (regs.oam_addr >> 2) & 127;
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}
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}
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add_clocks(502);
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//H = 512 (render)
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render_scanline();
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add_clocks(640);
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//H = 1152 (cache OBSEL)
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if(cache.oam_basesize != regs.oam_basesize) {
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cache.oam_basesize = regs.oam_basesize;
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sprite_list_valid = false;
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}
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cache.oam_nameselect = regs.oam_nameselect;
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cache.oam_tdaddr = regs.oam_tdaddr;
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add_clocks(lineclocks() - 1152); //seek to start of next scanline
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}
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}
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void PPU::add_clocks(unsigned clocks) {
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tick(clocks);
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step(clocks);
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synchronize_cpu();
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}
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void PPU::scanline() {
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line = vcounter();
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if(line == 0) {
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frame();
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//RTO flag reset
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regs.time_over = false;
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regs.range_over = false;
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}
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if(line == 1) {
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//mosaic reset
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for(int bg = BG1; bg <= BG4; bg++) regs.bg_y[bg] = 1;
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regs.mosaic_countdown = regs.mosaic_size + 1;
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regs.mosaic_countdown--;
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} else {
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for(int bg = BG1; bg <= BG4; bg++) {
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if(!regs.mosaic_enabled[bg] || !regs.mosaic_countdown) regs.bg_y[bg] = line;
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}
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if(!regs.mosaic_countdown) regs.mosaic_countdown = regs.mosaic_size + 1;
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regs.mosaic_countdown--;
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}
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}
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void PPU::render_scanline() {
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if(line >= 1 && line < (!overscan() ? 225 : 240)) {
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if(framecounter) return;
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render_line_oam_rto();
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render_line();
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}
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}
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void PPU::frame() {
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system.frame();
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if(field() == 0) {
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display.interlace = regs.interlace;
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regs.scanlines = (regs.overscan == false) ? 224 : 239;
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}
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framecounter = (frameskip == 0 ? 0 : (framecounter + 1) % frameskip);
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}
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void PPU::enable() {
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function<uint8 (unsigned)> reader = {&PPU::mmio_read, (PPU*)&ppu};
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function<void (unsigned, uint8)> writer = {&PPU::mmio_write, (PPU*)&ppu};
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bus.map(reader, writer, 0x00, 0x3f, 0x2100, 0x213f);
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bus.map(reader, writer, 0x80, 0xbf, 0x2100, 0x213f);
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}
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void PPU::power() {
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for(auto& n : vram) n = 0x00;
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for(auto& n : oam) n = 0x00;
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for(auto& n : cgram) n = 0x00;
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flush_tiledata_cache();
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region = (system.region() == System::Region::NTSC ? 0 : 1); //0 = NTSC, 1 = PAL
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regs.ioamaddr = 0x0000;
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regs.icgramaddr = 0x01ff;
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//$2100
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regs.display_disabled = true;
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regs.display_brightness = 15;
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//$2101
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regs.oam_basesize = 0;
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regs.oam_nameselect = 0;
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regs.oam_tdaddr = 0x0000;
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cache.oam_basesize = 0;
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cache.oam_nameselect = 0;
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cache.oam_tdaddr = 0x0000;
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//$2102-$2103
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regs.oam_baseaddr = 0x0000;
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regs.oam_addr = 0x0000;
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regs.oam_priority = false;
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regs.oam_firstsprite = 0;
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//$2104
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regs.oam_latchdata = 0x00;
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//$2105
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regs.bg_tilesize[BG1] = 0;
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regs.bg_tilesize[BG2] = 0;
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regs.bg_tilesize[BG3] = 0;
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regs.bg_tilesize[BG4] = 0;
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regs.bg3_priority = 0;
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regs.bg_mode = 0;
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//$2106
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regs.mosaic_size = 0;
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regs.mosaic_enabled[BG1] = false;
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regs.mosaic_enabled[BG2] = false;
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regs.mosaic_enabled[BG3] = false;
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regs.mosaic_enabled[BG4] = false;
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regs.mosaic_countdown = 0;
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//$2107-$210a
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regs.bg_scaddr[BG1] = 0x0000;
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regs.bg_scaddr[BG2] = 0x0000;
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regs.bg_scaddr[BG3] = 0x0000;
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regs.bg_scaddr[BG4] = 0x0000;
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regs.bg_scsize[BG1] = SC_32x32;
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regs.bg_scsize[BG2] = SC_32x32;
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regs.bg_scsize[BG3] = SC_32x32;
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regs.bg_scsize[BG4] = SC_32x32;
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//$210b-$210c
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regs.bg_tdaddr[BG1] = 0x0000;
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regs.bg_tdaddr[BG2] = 0x0000;
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regs.bg_tdaddr[BG3] = 0x0000;
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regs.bg_tdaddr[BG4] = 0x0000;
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//$210d-$2114
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regs.bg_ofslatch = 0x00;
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regs.m7_hofs = regs.m7_vofs = 0x0000;
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regs.bg_hofs[BG1] = regs.bg_vofs[BG1] = 0x0000;
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regs.bg_hofs[BG2] = regs.bg_vofs[BG2] = 0x0000;
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regs.bg_hofs[BG3] = regs.bg_vofs[BG3] = 0x0000;
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regs.bg_hofs[BG4] = regs.bg_vofs[BG4] = 0x0000;
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//$2115
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regs.vram_incmode = 1;
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regs.vram_mapping = 0;
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regs.vram_incsize = 1;
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//$2116-$2117
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regs.vram_addr = 0x0000;
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//$211a
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regs.mode7_repeat = 0;
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regs.mode7_vflip = false;
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regs.mode7_hflip = false;
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//$211b-$2120
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regs.m7_latch = 0x00;
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regs.m7a = 0x0000;
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regs.m7b = 0x0000;
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regs.m7c = 0x0000;
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regs.m7d = 0x0000;
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regs.m7x = 0x0000;
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regs.m7y = 0x0000;
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//$2121
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regs.cgram_addr = 0x0000;
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//$2122
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regs.cgram_latchdata = 0x00;
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//$2123-$2125
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regs.window1_enabled[BG1] = false;
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regs.window1_enabled[BG2] = false;
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regs.window1_enabled[BG3] = false;
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regs.window1_enabled[BG4] = false;
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regs.window1_enabled[OAM] = false;
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regs.window1_enabled[COL] = false;
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regs.window1_invert [BG1] = false;
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regs.window1_invert [BG2] = false;
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regs.window1_invert [BG3] = false;
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regs.window1_invert [BG4] = false;
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regs.window1_invert [OAM] = false;
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regs.window1_invert [COL] = false;
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regs.window2_enabled[BG1] = false;
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regs.window2_enabled[BG2] = false;
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regs.window2_enabled[BG3] = false;
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regs.window2_enabled[BG4] = false;
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regs.window2_enabled[OAM] = false;
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regs.window2_enabled[COL] = false;
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regs.window2_invert [BG1] = false;
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regs.window2_invert [BG2] = false;
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regs.window2_invert [BG3] = false;
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regs.window2_invert [BG4] = false;
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regs.window2_invert [OAM] = false;
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regs.window2_invert [COL] = false;
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//$2126-$2129
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regs.window1_left = 0x00;
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regs.window1_right = 0x00;
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regs.window2_left = 0x00;
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regs.window2_right = 0x00;
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//$212a-$212b
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regs.window_mask[BG1] = 0;
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regs.window_mask[BG2] = 0;
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regs.window_mask[BG3] = 0;
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regs.window_mask[BG4] = 0;
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regs.window_mask[OAM] = 0;
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regs.window_mask[COL] = 0;
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//$212c-$212d
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regs.bg_enabled[BG1] = false;
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regs.bg_enabled[BG2] = false;
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regs.bg_enabled[BG3] = false;
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regs.bg_enabled[BG4] = false;
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regs.bg_enabled[OAM] = false;
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regs.bgsub_enabled[BG1] = false;
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regs.bgsub_enabled[BG2] = false;
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regs.bgsub_enabled[BG3] = false;
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regs.bgsub_enabled[BG4] = false;
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regs.bgsub_enabled[OAM] = false;
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//$212e-$212f
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regs.window_enabled[BG1] = false;
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regs.window_enabled[BG2] = false;
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regs.window_enabled[BG3] = false;
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regs.window_enabled[BG4] = false;
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regs.window_enabled[OAM] = false;
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regs.sub_window_enabled[BG1] = false;
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regs.sub_window_enabled[BG2] = false;
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regs.sub_window_enabled[BG3] = false;
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regs.sub_window_enabled[BG4] = false;
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regs.sub_window_enabled[OAM] = false;
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//$2130
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regs.color_mask = 0;
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regs.colorsub_mask = 0;
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regs.addsub_mode = false;
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regs.direct_color = false;
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//$2131
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regs.color_mode = 0;
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regs.color_halve = false;
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regs.color_enabled[BACK] = false;
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regs.color_enabled[OAM] = false;
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regs.color_enabled[BG4] = false;
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regs.color_enabled[BG3] = false;
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regs.color_enabled[BG2] = false;
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regs.color_enabled[BG1] = false;
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//$2132
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regs.color_r = 0x00;
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regs.color_g = 0x00;
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regs.color_b = 0x00;
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regs.color_rgb = 0x0000;
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//$2133
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regs.mode7_extbg = false;
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regs.pseudo_hires = false;
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regs.overscan = false;
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regs.scanlines = 224;
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regs.oam_interlace = false;
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regs.interlace = false;
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//$2137
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regs.hcounter = 0;
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regs.vcounter = 0;
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regs.latch_hcounter = 0;
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regs.latch_vcounter = 0;
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regs.counters_latched = false;
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//$2139-$213a
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regs.vram_readbuffer = 0x0000;
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//$213e
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regs.time_over = false;
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regs.range_over = false;
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reset();
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}
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void PPU::reset() {
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create(Enter, system.cpu_frequency());
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PPUcounter::reset();
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memset(surface, 0, 512 * 512 * sizeof(uint32));
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frame();
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//$2100
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regs.display_disabled = true;
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display.interlace = false;
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display.overscan = false;
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regs.scanlines = 224;
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memset(sprite_list, 0, sizeof(sprite_list));
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sprite_list_valid = false;
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//open bus support
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regs.ppu1_mdr = 0xff;
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regs.ppu2_mdr = 0xff;
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//bg line counters
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regs.bg_y[0] = 0;
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regs.bg_y[1] = 0;
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regs.bg_y[2] = 0;
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regs.bg_y[3] = 0;
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}
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void PPU::layer_enable(unsigned layer, unsigned priority, bool enable) {
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switch(layer * 4 + priority) {
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case 0: layer_enabled[BG1][0] = enable; break;
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case 1: layer_enabled[BG1][1] = enable; break;
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case 4: layer_enabled[BG2][0] = enable; break;
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case 5: layer_enabled[BG2][1] = enable; break;
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case 8: layer_enabled[BG3][0] = enable; break;
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case 9: layer_enabled[BG3][1] = enable; break;
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case 12: layer_enabled[BG4][0] = enable; break;
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case 13: layer_enabled[BG4][1] = enable; break;
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case 16: layer_enabled[OAM][0] = enable; break;
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case 17: layer_enabled[OAM][1] = enable; break;
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case 18: layer_enabled[OAM][2] = enable; break;
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case 19: layer_enabled[OAM][3] = enable; break;
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}
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}
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void PPU::set_frameskip(unsigned frameskip_) {
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frameskip = frameskip_;
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framecounter = 0;
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}
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PPU::PPU() {
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surface = new uint32[512 * 512];
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output = surface + 16 * 512;
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alloc_tiledata_cache();
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for(unsigned l = 0; l < 16; l++) {
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for(unsigned i = 0; i < 4096; i++) {
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mosaic_table[l][i] = (i / (l + 1)) * (l + 1);
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}
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}
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layer_enabled[BG1][0] = true;
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layer_enabled[BG1][1] = true;
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layer_enabled[BG2][0] = true;
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layer_enabled[BG2][1] = true;
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layer_enabled[BG3][0] = true;
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layer_enabled[BG3][1] = true;
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layer_enabled[BG4][0] = true;
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layer_enabled[BG4][1] = true;
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layer_enabled[OAM][0] = true;
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layer_enabled[OAM][1] = true;
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layer_enabled[OAM][2] = true;
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layer_enabled[OAM][3] = true;
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frameskip = 0;
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framecounter = 0;
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}
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PPU::~PPU() {
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delete[] surface;
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free_tiledata_cache();
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}
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}
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