ref: 2e231162fee12ebe546a06e92cb6f2f4c25931f5
dir: /zelda_rtl.c/
#include "zelda_rtl.h" #include "variables.h" #include "misc.h" #include "nmi.h" #include "poly.h" #include "attract.h" #include "snes/ppu.h" #include "snes/snes_regs.h" #include "spc_player.h" ZeldaEnv g_zenv; // These point to the rewritten instance of the emu. uint8 g_ram[131072]; typedef struct SimpleHdma { const uint8 *table; const uint8 *indir_ptr; uint8 rep_count; uint8 mode; uint8 ppu_addr; uint8 indir_bank; } SimpleHdma; void SimpleHdma_Init(SimpleHdma *c, DmaChannel *dc); void SimpleHdma_DoLine(SimpleHdma *c); static const uint8 bAdrOffsets[8][4] = { {0, 0, 0, 0}, {0, 1, 0, 1}, {0, 0, 0, 0}, {0, 0, 1, 1}, {0, 1, 2, 3}, {0, 1, 0, 1}, {0, 0, 0, 0}, {0, 0, 1, 1} }; static const uint8 transferLength[8] = { 1, 2, 2, 4, 4, 4, 2, 4 }; const uint16 kUpperBitmasks[] = { 0x8000, 0x4000, 0x2000, 0x1000, 0x800, 0x400, 0x200, 0x100, 0x80, 0x40, 0x20, 0x10, 8, 4, 2, 1 }; const uint8 kLitTorchesColorPlus[] = {31, 8, 4, 0}; const uint8 kDungeonCrystalPendantBit[13] = {0, 0, 4, 2, 0, 16, 2, 1, 64, 4, 1, 32, 8}; const int8 kGetBestActionToPerformOnTile_x[4] = { 7, 7, -3, 16 }; const int8 kGetBestActionToPerformOnTile_y[4] = { 6, 24, 12, 12 }; #define AT_WORD(x) (uint8)(x), (x)>>8 // direct static const uint8 kAttractDmaTable0[13] = {0x20, AT_WORD(0x00ff), 0x50, AT_WORD(0xe018), 0x50, AT_WORD(0xe018), 1, AT_WORD(0x00ff), 0}; static const uint8 kAttractDmaTable1[10] = {0x48, AT_WORD(0x00ff), 0x30, AT_WORD(0xd830), 1, AT_WORD(0x00ff), 0}; static const uint8 kHdmaTableForEnding[19] = { 0x52, AT_WORD(0x600), 8, AT_WORD(0xe2), 8, AT_WORD(0x602), 5, AT_WORD(0x604), 0x10, AT_WORD(0x606), 0x81, AT_WORD(0xe2), 0, }; static const uint8 kSpotlightIndirectHdma[7] = {0xf8, AT_WORD(0x1b00), 0xf8, AT_WORD(0x1bf0), 0}; static const uint8 kMapModeHdma0[7] = {0xf0, AT_WORD(0xdd27), 0xf0, AT_WORD(0xde07), 0}; static const uint8 kMapModeHdma1[7] = {0xf0, AT_WORD(0xdee7), 0xf0, AT_WORD(0xdfc7), 0}; static const uint8 kAttractIndirectHdmaTab[7] = {0xf0, AT_WORD(0x1b00), 0xf0, AT_WORD(0x1be0), 0}; static const uint8 kHdmaTableForPrayingScene[7] = {0xf8, AT_WORD(0x1b00), 0xf8, AT_WORD(0x1bf0), 0}; void zelda_apu_write(uint32_t adr, uint8_t val) { assert(adr >= APUI00 && adr <= APUI03); g_zenv.player->input_ports[adr & 0x3] = val; } void zelda_apu_write_word(uint32_t adr, uint16_t val) { zelda_apu_write(adr, val); zelda_apu_write(adr + 1, val >> 8); } uint8_t zelda_read_apui00() { // This needs to be here because the ancilla code reads // from the apu and we don't want to make the core code // dependent on the apu timings, so relocated this value // to 0x648. return g_ram[kRam_APUI00]; } uint8_t zelda_apu_read(uint32_t adr) { return g_zenv.player->port_to_snes[adr & 0x3]; } uint16_t zelda_apu_read_word(uint32_t adr) { uint16_t rv = zelda_apu_read(adr); rv |= zelda_apu_read(adr + 1) << 8; return rv; } void zelda_ppu_write(uint32_t adr, uint8_t val) { assert(adr >= INIDISP && adr <= STAT78); ppu_write(g_zenv.ppu, (uint8)adr, val); } void zelda_ppu_write_word(uint32_t adr, uint16_t val) { zelda_ppu_write(adr, val); zelda_ppu_write(adr + 1, val >> 8); } void zelda_apu_runcycles() { // apu_cycle(g_zenv.apu); } const uint8 *SimpleHdma_GetPtr(uint32 p) { switch (p) { case 0xCFA87: return kAttractDmaTable0; case 0xCFA94: return kAttractDmaTable1; case 0xebd53: return kHdmaTableForEnding; case 0x0F2FB: return kSpotlightIndirectHdma; case 0xabdcf: return kMapModeHdma0; // mode7 case 0xabdd6: return kMapModeHdma1; // mode7 case 0xABDDD: return kAttractIndirectHdmaTab; // mode7 case 0x2c80c: return kHdmaTableForPrayingScene; case 0x1b00: return (uint8 *)hdma_table_dynamic; case 0x1be0: return (uint8 *)hdma_table_dynamic + 0xe0; case 0x1bf0: return (uint8 *)hdma_table_dynamic + 0xf0; case 0xadd27: return (uint8*)kMapMode_Zooms1; case 0xade07: return (uint8*)kMapMode_Zooms1 + 0xe0; case 0xadee7: return (uint8*)kMapMode_Zooms2; case 0xadfc7: return (uint8*)kMapMode_Zooms2 + 0xe0; case 0x600: return &g_ram[0x600]; case 0x602: return &g_ram[0x602]; case 0x604: return &g_ram[0x604]; case 0x606: return &g_ram[0x606]; case 0xe2: return &g_ram[0xe2]; default: assert(0); return NULL; } } void SimpleHdma_Init(SimpleHdma *c, DmaChannel *dc) { if (!dc->hdmaActive) { c->table = 0; return; } c->table = SimpleHdma_GetPtr(dc->aAdr | dc->aBank << 16); c->rep_count = 0; c->mode = dc->mode | dc->indirect << 6; c->ppu_addr = dc->bAdr; c->indir_bank = dc->indBank; } void SimpleHdma_DoLine(SimpleHdma *c) { if (c->table == NULL) return; bool do_transfer = false; if ((c->rep_count & 0x7f) == 0) { c->rep_count = *c->table++; if (c->rep_count == 0) { c->table = NULL; return; } if(c->mode & 0x40) { c->indir_ptr = SimpleHdma_GetPtr(c->indir_bank << 16 | c->table[0] | c->table[1] * 256); c->table += 2; } do_transfer = true; } if(do_transfer || c->rep_count & 0x80) { for(int j = 0, j_end = transferLength[c->mode & 7]; j < j_end; j++) { uint8 v = c->mode & 0x40 ? *c->indir_ptr++ : *c->table++; zelda_ppu_write(0x2100 + c->ppu_addr + bAdrOffsets[c->mode & 7][j], v); } } c->rep_count--; } void ConfigurePpuSideSpace() { // Let PPU impl know about the maximum allowed extra space on the sides and bottom int extra_right = 0, extra_left = 0, extra_bottom = 0; // printf("main %d, sub %d (%d, %d, %d)\n", main_module_index, submodule_index, BG2HOFS_copy2, room_bounds_x.v[2 | (quadrant_fullsize_x >> 1)], quadrant_fullsize_x >> 1); int mod = main_module_index; if (mod == 14) mod = saved_module_for_menu; if (mod == 9) { // outdoors extra_left = BG2HOFS_copy2 - ow_scroll_vars0.xstart; extra_right = ow_scroll_vars0.xend - BG2HOFS_copy2; extra_bottom = ow_scroll_vars0.yend - BG2VOFS_copy2; } else if (mod == 7) { // indoors int qm = quadrant_fullsize_x >> 1; extra_left = IntMax(BG2HOFS_copy2 - room_bounds_x.v[qm], 0); extra_right = IntMax(room_bounds_x.v[qm + 2] - BG2HOFS_copy2, 0); int qy = quadrant_fullsize_y >> 1; extra_bottom = IntMax(room_bounds_y.v[qy + 2] - BG2VOFS_copy2, 0); } else if (mod == 20 || mod == 0 || mod == 1) { extra_left = kPpuExtraLeftRight, extra_right = kPpuExtraLeftRight; extra_bottom = 16; } PpuSetExtraSideSpace(g_zenv.ppu, extra_left, extra_right, extra_bottom); } bool ZeldaDrawPpuFrame(uint8 *pixel_buffer, size_t pitch, uint32 render_flags) { SimpleHdma hdma_chans[2]; bool rv = PpuBeginDrawing(g_zenv.ppu, pixel_buffer, pitch, render_flags); dma_startDma(g_zenv.dma, HDMAEN_copy, true); SimpleHdma_Init(&hdma_chans[0], &g_zenv.dma->channel[6]); SimpleHdma_Init(&hdma_chans[1], &g_zenv.dma->channel[7]); // Cheat: Let the PPU impl know about the hdma perspective correction so it can avoid guessing. if ((render_flags & kPpuRenderFlags_4x4Mode7) && g_zenv.ppu->mode == 7) { if (hdma_chans[0].table == kMapModeHdma0) PpuSetMode7PerspectiveCorrection(g_zenv.ppu, kMapMode_Zooms1[0], kMapMode_Zooms1[223]); else if (hdma_chans[0].table == kMapModeHdma1) PpuSetMode7PerspectiveCorrection(g_zenv.ppu, kMapMode_Zooms2[0], kMapMode_Zooms2[223]); else if (hdma_chans[0].table == kAttractIndirectHdmaTab) PpuSetMode7PerspectiveCorrection(g_zenv.ppu, hdma_table_dynamic[0], hdma_table_dynamic[223]); else PpuSetMode7PerspectiveCorrection(g_zenv.ppu, 0, 0); } if (g_zenv.ppu->extraLeftRight != 0 || render_flags & kPpuRenderFlags_Height240) ConfigurePpuSideSpace(); int height = render_flags & kPpuRenderFlags_Height240 ? 240 : 224; for (int i = 0; i <= height; i++) { if (i == 128 && irq_flag) { zelda_ppu_write(BG3HOFS, selectfile_var8); zelda_ppu_write(BG3HOFS, selectfile_var8 >> 8); zelda_ppu_write(BG3VOFS, 0); zelda_ppu_write(BG3VOFS, 0); if (irq_flag & 0x80) { irq_flag = 0; zelda_snes_dummy_write(NMITIMEN, 0x81); } } ppu_runLine(g_zenv.ppu, i); SimpleHdma_DoLine(&hdma_chans[0]); SimpleHdma_DoLine(&hdma_chans[1]); } return rv; } void HdmaSetup(uint32 addr6, uint32 addr7, uint8 transfer_unit, uint8 reg6, uint8 reg7, uint8 indirect_bank) { Dma *dma = g_zenv.dma; if (addr6) { dma_write(dma, DMAP6, transfer_unit); dma_write(dma, BBAD6, reg6); dma_write(dma, A1T6L, addr6); dma_write(dma, A1T6H, addr6 >> 8); dma_write(dma, A1B6, addr6 >> 16); dma_write(dma, DAS60, indirect_bank); } dma_write(dma, DMAP7, transfer_unit); dma_write(dma, BBAD7, reg7); dma_write(dma, A1T7L, addr7); dma_write(dma, A1T7H, addr7 >> 8); dma_write(dma, A1B7, addr7 >> 16); dma_write(dma, DAS70, indirect_bank); } void ZeldaInitializationCode() { zelda_snes_dummy_write(NMITIMEN, 0); zelda_snes_dummy_write(HDMAEN, 0); zelda_snes_dummy_write(MDMAEN, 0); zelda_apu_write(APUI00, 0); zelda_apu_write(APUI01, 0); zelda_apu_write(APUI02, 0); zelda_apu_write(APUI03, 0); zelda_ppu_write(INIDISP, 0x80); Sound_LoadIntroSongBank(); Startup_InitializeMemory(); animated_tile_data_src = 0xa680; dma_source_addr_9 = 0xb280; dma_source_addr_14 = 0xb280 + 0x60; zelda_snes_dummy_write(NMITIMEN, 0x81); } void ZeldaRunGameLoop() { frame_counter++; ClearOamBuffer(); Module_MainRouting(); NMI_PrepareSprites(); nmi_boolean = 0; } void ZeldaInitialize() { g_zenv.dma = dma_init(NULL); g_zenv.ppu = ppu_init(NULL); g_zenv.ram = g_ram; g_zenv.sram = (uint8*)calloc(8192, 1); g_zenv.vram = g_zenv.ppu->vram; g_zenv.player = SpcPlayer_Create(); SpcPlayer_Initialize(g_zenv.player); dma_reset(g_zenv.dma); ppu_reset(g_zenv.ppu); } void ZeldaRunPolyLoop() { if (intro_did_run_step && !nmi_flag_update_polyhedral) { Poly_RunFrame(); intro_did_run_step = 0; nmi_flag_update_polyhedral = 0xff; } } void ZeldaRunFrame(uint16 input, int run_what) { if (animated_tile_data_src == 0) ZeldaInitializationCode(); if (run_what & 2) ZeldaRunPolyLoop(); if (run_what & 1) ZeldaRunGameLoop(); Interrupt_NMI(input); } void ClearOamBuffer() { // 80841e for (int i = 0; i < 128; i++) oam_buf[i].y = 0xf0; } void Startup_InitializeMemory() { // 8087c0 memset(g_ram + 0x0, 0, 0x2000); main_palette_buffer[0] = 0; srm_var1 = 0; uint8 *sram = g_zenv.sram; if (WORD(sram[0x3e5]) != 0x55aa) WORD(sram[0x3e5]) = 0; if (WORD(sram[0x8e5]) != 0x55aa) WORD(sram[0x8e5]) = 0; if (WORD(sram[0xde5]) != 0x55aa) WORD(sram[0xde5]) = 0; zelda_ppu_write(TMW, 0); INIDISP_copy = 0x80; flag_update_cgram_in_nmi++; } void LoadSongBank(const uint8 *p) { // 808888 SpcPlayer_Upload(g_zenv.player, p); } bool msu_enabled; static FILE *msu_file; static uint32 msu_loop_start; static uint32 msu_buffer_size, msu_buffer_pos; static uint8 msu_buffer[65536]; static const uint8 kMsuTracksWithRepeat[48] = { 1,0,1,1,1,1,1,1,0,1,0,1,1,1,1,0, 1,1,1,0,1,1,1,1,1,1,1,1,1,0,1,1, 1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1, }; bool ZeldaIsMusicPlaying() { if (msu_track) { return msu_file != NULL; } else { return g_zenv.player->port_to_snes[0] != 0; } } void ZeldaOpenMsuFile() { if (msu_file) fclose(msu_file), msu_file = NULL; if (msu_track == 0) return; char buf[40], hdr[8]; sprintf(buf, "msu/alttp_msu-%d.pcm", msu_track); msu_file = fopen(buf, "rb"); if (msu_file == NULL || fread(hdr, 1, 8, msu_file) != 8 || *(uint32 *)(hdr + 0) != (('1' << 24) | ('U' << 16) | ('S' << 8) | 'M')) { if (msu_file != NULL) fclose(msu_file), msu_file = NULL; zelda_apu_write(APUI00, msu_track); msu_track = 0; return; } if (msu_curr_sample != 0) fseek(msu_file, msu_curr_sample * 4 + 8, SEEK_SET); printf("Loading MSU PCM file: %s\n", buf); msu_loop_start = *(uint32 *)(hdr + 4); msu_buffer_size = msu_buffer_pos = 0; } void ZeldaPlayMsuAudioTrack() { if (!msu_enabled) normal_playback: { msu_track = 0; zelda_apu_write(APUI00, music_control); return; } if ((music_control & 0xf0) != 0xf0) { msu_track = music_control; msu_volume = 255; msu_curr_sample = 0; ZeldaOpenMsuFile(); } else if (msu_file == NULL) { goto normal_playback; } zelda_apu_write(APUI00, 0xf1); // pause spc player } void MixinMsuAudioData(int16 *audio_buffer, int audio_samples) { if (msu_file == NULL) return; // msu inactive // handle volume fade if (last_music_control >= 0xf1) { if (last_music_control == 0xf1) msu_volume = IntMax(msu_volume - 3, 0); else if (last_music_control == 0xf2) msu_volume = IntMax(msu_volume - 3, 0x40); else if (last_music_control == 0xf3) msu_volume = IntMin(msu_volume + 3, 0xff); } if (msu_volume == 0) return; int last_audio_samples = 0; for (;;) { if (msu_buffer_pos >= msu_buffer_size) { msu_buffer_size = (int)fread(msu_buffer, 4, sizeof(msu_buffer) / 4, msu_file); msu_buffer_pos = 0; } int nr = IntMin(audio_samples, msu_buffer_size - msu_buffer_pos); uint8 *buf = msu_buffer + msu_buffer_pos * 4; msu_buffer_pos += nr; msu_curr_sample += nr; int volume = msu_volume + 1; if (volume == 256) { for (int i = 0; i < nr; i++) { audio_buffer[i * 2 + 0] += ((int16 *)buf)[i * 2 + 0]; audio_buffer[i * 2 + 1] += ((int16 *)buf)[i * 2 + 1]; } } else { for (int i = 0; i < nr; i++) { audio_buffer[i * 2 + 0] += ((int16 *)buf)[i * 2 + 0] * volume >> 8; audio_buffer[i * 2 + 1] += ((int16 *)buf)[i * 2 + 1] * volume >> 8; } } audio_samples -= nr, audio_buffer += nr * 2; if (audio_samples == 0) break; if (nr != 0) continue; if (last_audio_samples == audio_samples) { // error? zelda_apu_write(APUI00, msu_track); fclose(msu_file), msu_file = NULL; return; } last_audio_samples = audio_samples; if (!kMsuTracksWithRepeat[msu_track]) { fclose(msu_file), msu_file = NULL; return; } fseek(msu_file, msu_loop_start * 4 + 8, SEEK_SET); msu_curr_sample = msu_loop_start; } }