mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-10-05 00:21:35 +02:00
42a9f9cfa4
byuu says: Fixed all of the previously mentioned problems by myself and Jonas Quinn. Fixed up JOYP and hooked up JOYP interrupts, they work on JOYP writes as well if your selection makes the low four bits change to != 0xF. Added basic sprite emulation, very very very lousy but it works for Tetris. Fixed DAA, fuck that opcode. Fixes blargg's CPU tests 1 and 11 (for some odd reason.) Only test 2 is failing, on the "EI" test. Maybe it relies on STAT interrupts? Did some other stuff. Tetris is now 100% fully playable. But that renderer is an abomination. Soooooo simplistic and missing so many edge cases. But holy shit, a fully playable commercial game in three days. I would have killed to have made that progress when I started on bsnes.
153 lines
3.4 KiB
C++
Executable File
153 lines
3.4 KiB
C++
Executable File
#include <gameboy.hpp>
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#define LCD_CPP
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namespace GameBoy {
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#include "mmio/mmio.cpp"
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LCD lcd;
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void LCD::Main() {
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lcd.main();
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}
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void LCD::main() {
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while(true) {
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add_clocks(4);
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}
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}
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void LCD::add_clocks(unsigned clocks) {
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status.lx += clocks;
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if(status.lx >= 456) scanline();
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cpu.clock -= clocks;
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if(cpu.clock <= 0) co_switch(scheduler.active_thread = cpu.thread);
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}
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void LCD::scanline() {
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status.lx -= 456;
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status.ly++;
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if(status.ly == 144) cpu.status.interrupt_request_vblank = 1;
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//print("Vblank - ", cpu.status.ime, " - ", cpu.status.interrupt_enable_vblank, "\n"); }
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if(status.ly == 154) frame();
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if(status.ly < 144) render();
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}
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void LCD::frame() {
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system.interface->video_refresh(screen);
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system.interface->input_poll();
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cpu.mmio_joyp_poll();
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status.ly = 0;
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scheduler.exit();
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}
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void LCD::render() {
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uint8_t *output = screen + status.ly * 160;
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uint8 y = status.ly + status.scy;
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uint16 tmaddr = (status.bg_tilemap_select == 0 ? 0x1800 : 0x1c00);
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tmaddr += (y >> 3) * 32;
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tmaddr += (status.scx >> 3);
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for(unsigned t = 0; t < 20; t++) {
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unsigned tdaddr;
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if(status.bg_tiledata_select == 0) {
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tdaddr = 0x1000 + (int8)vram[tmaddr + t] * 16;
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} else {
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tdaddr = 0x0000 + vram[tmaddr + t] * 16;
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}
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tdaddr += (status.ly & 7) * 2;
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uint8 d0 = vram[tdaddr + 0];
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uint8 d1 = vram[tdaddr + 1];
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for(unsigned x = 0; x < 8; x++) {
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uint8 palette = ((d0 & 0x80) >> 7) + ((d1 & 0x80) >> 6);
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d0 <<= 1, d1 <<= 1;
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*output++ = (3 - status.bgp[palette]) * 0x55;
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}
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}
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output = screen + status.ly * 160;
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for(unsigned s = 0; s < 40; s++) {
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unsigned sy = oam[(s << 2) + 0] - 9;
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unsigned sx = oam[(s << 2) + 1] - 8;
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unsigned tile = oam[(s << 2) + 2];
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unsigned attribute = oam[(s << 2) + 3];
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sy -= status.ly;
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if(sy >= 8) continue;
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if(attribute & 0x40||1) sy ^= 7;
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unsigned addr = tile * 16 + sy * 2;
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uint8 d0 = vram[addr + 0];
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uint8 d1 = vram[addr + 1];
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unsigned xflip = attribute & 0x20 ? -7 : 0;
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for(unsigned x = 0; x < 8; x++) {
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uint8 palette = ((d0 & 0x80) >> 7) + ((d1 & 0x80) >> 6);
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d0 <<= 1, d1 <<= 1;
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if(palette == 0) continue;
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palette = status.obp[(bool)(attribute & 0x10)][palette];
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output[sx + (x ^ xflip)] = (3 - palette) * 0x55;
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}
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}
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}
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void LCD::power() {
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for(unsigned n = 0x8000; n <= 0x9fff; n++) bus.mmio[n] = this; //VRAM
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for(unsigned n = 0xff40; n <= 0xff4b; n++) bus.mmio[n] = this; //MMIO
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for(unsigned n = 0xfe00; n <= 0xfe9f; n++) bus.mmio[n] = this; //OAM
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for(unsigned n = 0; n < 8192; n++) vram[n] = 0x00;
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for(unsigned n = 0; n < 160; n++) oam [n] = 0x00;
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reset();
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}
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void LCD::reset() {
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create(Main, 4 * 1024 * 1024);
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for(unsigned n = 0; n < 160 * 144; n++) screen[n] = 0x00;
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status.lx = 0;
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status.display_enable = 0;
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status.window_tilemap_select = 0;
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status.window_display_enable = 0;
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status.bg_tiledata_select = 0;
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status.bg_tilemap_select = 0;
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status.obj_size = 0;
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status.obj_enable = 0;
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status.bg_display = 0;
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status.interrupt_lyc = 0;
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status.interrupt_oam = 0;
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status.interrupt_vblank = 0;
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status.interrupt_hblank = 0;
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status.coincidence = 0;
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status.mode = 0;
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status.scy = 0;
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status.scx = 0;
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status.ly = 0;
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status.lyc = 0;
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for(unsigned n = 0; n < 4; n++) {
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status.bgp[n] = n;
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status.obp[0][n] = n;
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status.obp[1][n] = n;
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}
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status.wy = 0;
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status.wx = 0;
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}
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}
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