ref: 393e572945ba9f2c011d97d70292776d2207804e
dir: /nmi.c/
#include "nmi.h" #include "zelda_rtl.h" #include "variables.h" #include "messaging.h" #include "snes/snes_regs.h" #include "snes/ppu.h" #include "assets.h" static const uint8 kNmiVramAddrs[] = { 0, 0, 4, 8, 12, 8, 12, 0, 4, 0, 8, 4, 12, 4, 12, 0, 8, 16, 20, 24, 28, 24, 28, 16, 20, 16, 24, 20, 28, 20, 28, 16, 24, 96, 104, }; static PlayerHandlerFunc *const kNmiSubroutines[25] = { &NMI_UploadTilemap_doNothing, &NMI_UploadTilemap, &NMI_UploadBG3Text, &NMI_UpdateOWScroll, &NMI_UpdateSubscreenOverlay, &NMI_UpdateBG1Wall, &NMI_TileMapNothing, &NMI_UpdateLoadLightWorldMap, &NMI_UpdateBG2Left, &NMI_UpdateBGChar3and4, &NMI_UpdateBGChar5and6, &NMI_UpdateBGCharHalf, &NMI_UploadSubscreenOverlayLatter, &NMI_UploadSubscreenOverlayFormer, &NMI_UpdateBGChar0, &NMI_UpdateBGChar1, &NMI_UpdateBGChar2, &NMI_UpdateBGChar3, &NMI_UpdateObjChar0, &NMI_UpdateObjChar2, &NMI_UpdateObjChar3, &NMI_UploadDarkWorldMap, &NMI_UploadGameOverText, &NMI_UpdatePegTiles, &NMI_UpdateStarTiles, }; void NMI_UploadSubscreenOverlayFormer() { NMI_HandleArbitraryTileMap(&g_ram[0x12000], 0, 0x40); } void NMI_UploadSubscreenOverlayLatter() { NMI_HandleArbitraryTileMap(&g_ram[0x13000], 0x40, 0x80); } static void CopyToVram(uint32 dstv, const uint8 *src, int len) { memcpy(&g_zenv.vram[dstv], src, len); } static void CopyToVramVertical(uint32 dstv, const uint8 *src, int len) { assert(!(len & 1)); uint16 *dst = &g_zenv.vram[dstv]; for (int i = 0, i_end = len >> 1; i < i_end; i++, dst += 32, src += 2) *dst = WORD(*src); } static void CopyToVramLow(const uint8 *src, uint32 addr, int num) { uint16 *dst = &g_zenv.vram[addr]; for (int i = 0; i < num; i++) dst[i] = (dst[i] & ~0xff) | src[i]; } void WritePpuRegisters() { zelda_ppu_write(W12SEL, W12SEL_copy); zelda_ppu_write(W34SEL, W34SEL_copy); zelda_ppu_write(WOBJSEL, WOBJSEL_copy); zelda_ppu_write(CGWSEL, CGWSEL_copy); zelda_ppu_write(CGADSUB, CGADSUB_copy); zelda_ppu_write(COLDATA, COLDATA_copy0); zelda_ppu_write(COLDATA, COLDATA_copy1); zelda_ppu_write(COLDATA, COLDATA_copy2); zelda_ppu_write(TM, TM_copy); zelda_ppu_write(TS, TS_copy); zelda_ppu_write(TMW, TMW_copy); zelda_ppu_write(TSW, TSW_copy); zelda_ppu_write(BG1HOFS, BG1HOFS_copy); zelda_ppu_write(BG1HOFS, BG1HOFS_copy >> 8); zelda_ppu_write(BG1VOFS, BG1VOFS_copy); zelda_ppu_write(BG1VOFS, BG1VOFS_copy >> 8); zelda_ppu_write(BG2HOFS, BG2HOFS_copy); zelda_ppu_write(BG2HOFS, BG2HOFS_copy >> 8); zelda_ppu_write(BG2VOFS, BG2VOFS_copy); zelda_ppu_write(BG2VOFS, BG2VOFS_copy >> 8); zelda_ppu_write(BG3HOFS, BG3HOFS_copy2); zelda_ppu_write(BG3HOFS, BG3HOFS_copy2 >> 8); zelda_ppu_write(BG3VOFS, BG3VOFS_copy2); zelda_ppu_write(BG3VOFS, BG3VOFS_copy2 >> 8); zelda_ppu_write(INIDISP, INIDISP_copy); zelda_ppu_write(MOSAIC, MOSAIC_copy); zelda_ppu_write(BGMODE, BGMODE_copy); if ((BGMODE_copy & 7) == 7) { zelda_ppu_write(M7B, 0); zelda_ppu_write(M7B, 0); zelda_ppu_write(M7C, 0); zelda_ppu_write(M7C, 0); zelda_ppu_write(M7X, M7X_copy); zelda_ppu_write(M7X, M7X_copy >> 8); zelda_ppu_write(M7Y, M7Y_copy); zelda_ppu_write(M7Y, M7Y_copy >> 8); } zelda_ppu_write(BG12NBA, 0x22); zelda_ppu_write(BG34NBA, 7); } void Interrupt_NMI(uint16 joypad_input) { // 8080c9 if (music_control == 0) { if (zelda_apu_read(APUI00) == last_music_control) zelda_apu_write(APUI00, 0); // Zelda causes unwanted music change when going in a portal. last_music_control doesn't hold the // song but the last applied effect } else if (music_control != (enhanced_features0 & kFeatures0_MiscBugFixes ? music_unk1 : last_music_control)) { last_music_control = music_control; ZeldaPlayMsuAudioTrack(); if (music_control < 0xf2) music_unk1 = music_control; music_control = 0; } if (sound_effect_ambient == 0) { if (zelda_apu_read(APUI01) == sound_effect_ambient_last) zelda_apu_write(APUI01, 0); } else { sound_effect_ambient_last = sound_effect_ambient; zelda_apu_write(APUI01, sound_effect_ambient); sound_effect_ambient = 0; } zelda_apu_write(APUI02, sound_effect_1); zelda_apu_write(APUI03, sound_effect_2); sound_effect_1 = 0; sound_effect_2 = 0; if (!nmi_boolean) { nmi_boolean = true; NMI_DoUpdates(); NMI_ReadJoypads(joypad_input); } if (is_nmi_thread_active) { NMI_UpdateIRQGFX(); thread_other_stack = (thread_other_stack != 0x1f31) ? 0x1f31 : 0x1f2; } WritePpuRegisters(); } void NMI_ReadJoypads(uint16 joypad_input) { // 8083d1 uint16 both = joypad_input; uint16 reversed = 0; for (int i = 0; i < 16; i++, both >>= 1) reversed = reversed * 2 + (both & 1); uint8 r0 = reversed; uint8 r1 = reversed >> 8; joypad1L_last = r0; filtered_joypad_L = (r0 ^ joypad1L_last2) & r0; joypad1L_last2 = r0; joypad1H_last = r1; filtered_joypad_H = (r1 ^ joypad1H_last2) & r1; joypad1H_last2 = r1; } void NMI_DoUpdates() { // 8089e0 if (!nmi_disable_core_updates) { memcpy(&g_zenv.vram[0x4100], &kLinkGraphics[dma_source_addr_0 - 0x8000], 0x40); memcpy(&g_zenv.vram[0x4120], &kLinkGraphics[dma_source_addr_1 - 0x8000], 0x40); memcpy(&g_zenv.vram[0x4140], &kLinkGraphics[dma_source_addr_2 - 0x8000], 0x20); memcpy(&g_zenv.vram[0x4000], &kLinkGraphics[dma_source_addr_3 - 0x8000], 0x40); memcpy(&g_zenv.vram[0x4020], &kLinkGraphics[dma_source_addr_4 - 0x8000], 0x40); memcpy(&g_zenv.vram[0x4040], &kLinkGraphics[dma_source_addr_5 - 0x8000], 0x20); memcpy(&g_zenv.vram[0x4050], &g_ram[dma_source_addr_6], 0x40); memcpy(&g_zenv.vram[0x4070], &g_ram[dma_source_addr_7], 0x40); memcpy(&g_zenv.vram[0x4090], &g_ram[dma_source_addr_8], 0x40); memcpy(&g_zenv.vram[0x40b0], &g_ram[dma_source_addr_9], 0x20); memcpy(&g_zenv.vram[0x40c0], &g_ram[dma_source_addr_10], 0x40); memcpy(&g_zenv.vram[0x4150], &g_ram[dma_source_addr_11], 0x40); memcpy(&g_zenv.vram[0x4170], &g_ram[dma_source_addr_12], 0x40); memcpy(&g_zenv.vram[0x4190], &g_ram[dma_source_addr_13], 0x40); memcpy(&g_zenv.vram[0x41b0], &g_ram[dma_source_addr_14], 0x20); memcpy(&g_zenv.vram[0x41c0], &g_ram[dma_source_addr_15], 0x40); memcpy(&g_zenv.vram[0x4200], &g_ram[dma_source_addr_16], 0x40); memcpy(&g_zenv.vram[0x4220], &g_ram[dma_source_addr_17], 0x40); memcpy(&g_zenv.vram[0x4240], &g_ram[0xbd40], 0x40); memcpy(&g_zenv.vram[0x4300], &g_ram[dma_source_addr_18], 0x40); memcpy(&g_zenv.vram[0x4320], &g_ram[dma_source_addr_19], 0x40); memcpy(&g_zenv.vram[0x4340], &g_ram[0xbd80], 0x40); if (BYTE(flag_travel_bird)) { memcpy(&g_zenv.vram[0x40e0], &g_ram[dma_source_addr_20], 0x40); memcpy(&g_zenv.vram[0x41e0], &g_ram[dma_source_addr_21], 0x40); } memcpy(&g_zenv.vram[animated_tile_vram_addr], &g_ram[animated_tile_data_src], 0x400); } if (flag_update_hud_in_nmi) { memcpy(&g_zenv.vram[word_7E0219], hud_tile_indices_buffer, 165 * sizeof(uint16)); } if (flag_update_cgram_in_nmi) { memcpy(g_zenv.ppu->cgram, main_palette_buffer, 0x200); } flag_update_hud_in_nmi = 0; flag_update_cgram_in_nmi = 0; memcpy(g_zenv.ppu->oam, &g_ram[0x800], 0x220); if (nmi_load_bg_from_vram) { const uint8 *p; switch (nmi_load_bg_from_vram) { case 1: p = g_ram + 0x1002; break; case 2: p = g_ram + 0x1000; break; case 3: p = kBgTilemap_0; break; case 4: p = g_ram + 0x21b; break; case 5: p = kBgTilemap_1; break; case 6: p = kBgTilemap_2; break; case 7: p = kBgTilemap_3; break; case 8: p = kBgTilemap_4; break; case 9: p = kBgTilemap_5; break; default: assert(0); } HandleStripes14(p); if (nmi_load_bg_from_vram == 1) vram_upload_offset = 0; nmi_load_bg_from_vram = 0; } if (nmi_update_tilemap_dst) { memcpy(&g_zenv.vram[nmi_update_tilemap_dst * 256], &g_ram[0x10000 + nmi_update_tilemap_src], 0x200); nmi_update_tilemap_dst = 0; } if (nmi_copy_packets_flag) { uint8 *p = (uint8 *)uvram.data; do { int dst = WORD(p[0]); int vmain = p[2]; int len = p[3]; p += 4; if (vmain == 0x80) { // plain copy memcpy(&g_zenv.vram[dst], p, len); } else if (vmain == 0x81) { // copy with other increment assert((len & 1) == 0); uint16 *dp = &g_zenv.vram[dst]; for (int i = 0; i < len; i += 2, dp += 32) *dp = WORD(p[i]); } else { assert(0); } p += len; } while (WORD(p[0]) != 0xffff); nmi_copy_packets_flag = 0; nmi_disable_core_updates = 0; } int idx = nmi_subroutine_index; nmi_subroutine_index = 0; kNmiSubroutines[idx](); } void NMI_UploadTilemap() { // 808cb0 memcpy(&g_zenv.vram[kNmiVramAddrs[BYTE(nmi_load_target_addr)] << 8], &g_ram[0x1000], 0x800); *(uint16 *)&g_ram[0x1000] = 0; nmi_disable_core_updates = 0; } void NMI_UploadTilemap_doNothing() { // 808ce3 } void NMI_UploadBG3Text() { // 808ce4 memcpy(&g_zenv.vram[0x7c00], &g_ram[0x10000], 0x7e0); nmi_disable_core_updates = 0; } void NMI_UpdateOWScroll() { // 808d13 uint8 *src = (uint8 *)uvram.data, *src_org = src; int f = WORD(src[0]); int step = (f & 0x8000) ? 32 : 1; int len = f & 0x3fff; src += 2; do { uint16 *dst = &g_zenv.vram[WORD(src[0])]; src += 2; for (int i = 0, i_end = len >> 1; i < i_end; i++, dst += step, src += 2) *dst = WORD(*src); } while (!(src[1] & 0x80)); nmi_disable_core_updates = 0; } void NMI_UpdateSubscreenOverlay() { // 808d62 NMI_HandleArbitraryTileMap(&g_ram[0x12000], 0, 0x80); } void NMI_HandleArbitraryTileMap(const uint8 *src, int i, int i_end) { // 808dae uint16 *r10 = &word_7F4000; do { memcpy(&g_zenv.vram[r10[i >> 1]], src, 0x80); src += 0x80; } while ((i += 2) != i_end); nmi_disable_core_updates = 0; } void NMI_UpdateBG1Wall() { // 808e09 // Secret Wall Right CopyToVramVertical(nmi_load_target_addr, &g_ram[0xc880], 0x40); CopyToVramVertical(nmi_load_target_addr + 0x800, &g_ram[0xc8c0], 0x40); } void NMI_TileMapNothing() { // 808e4b } void NMI_UpdateLoadLightWorldMap() { // 808e54 static const uint16 kLightWorldTileMapDsts[4] = { 0, 0x20, 0x1000, 0x1020 }; const uint8 *src = GetLightOverworldTilemap(); for (int j = 0; j != 4; j++) { int t = kLightWorldTileMapDsts[j]; for (int i = 0x20; i; i--) { CopyToVramLow(src, t, 0x20); src += 32; t += 0x80; } } } void NMI_UpdateBG2Left() { // 808ea9 CopyToVram(0, &g_ram[0x10000], 0x800); CopyToVram(0x800, &g_ram[0x10800], 0x800); } void NMI_UpdateBGChar3and4() { // 808ee7 memcpy(&g_zenv.vram[0x2c00], &g_ram[0x10000], 0x1000); nmi_disable_core_updates = 0; } void NMI_UpdateBGChar5and6() { // 808f16 memcpy(&g_zenv.vram[0x3400], &g_ram[0x11000], 0x1000); nmi_disable_core_updates = 0; } void NMI_UpdateBGCharHalf() { // 808f45 memcpy(&g_zenv.vram[BYTE(nmi_load_target_addr) * 256], &g_ram[0x11000], 0x400); } void NMI_UpdateBGChar0() { // 808f72 NMI_RunTileMapUpdateDMA(0x2000); } void NMI_UpdateBGChar1() { // 808f79 NMI_RunTileMapUpdateDMA(0x2800); } void NMI_UpdateBGChar2() { // 808f80 NMI_RunTileMapUpdateDMA(0x3000); } void NMI_UpdateBGChar3() { // 808f87 NMI_RunTileMapUpdateDMA(0x3800); } void NMI_UpdateObjChar0() { // 808f8e CopyToVram(0x4400, &g_ram[0x10000], 0x800); nmi_disable_core_updates = 0; } void NMI_UpdateObjChar2() { // 808fbd NMI_RunTileMapUpdateDMA(0x5000); } void NMI_UpdateObjChar3() { // 808fc4 NMI_RunTileMapUpdateDMA(0x5800); } void NMI_RunTileMapUpdateDMA(int dst) { // 808fc9 CopyToVram(dst, &g_ram[0x10000], 0x1000); nmi_disable_core_updates = 0; } void NMI_UploadDarkWorldMap() { // 808ff3 static const uint16 kLightWorldTileMapSrcs[4] = { 0, 0x20, 0x1000, 0x1020 }; const uint8 *src = g_ram + 0x1000; int t = 0x810; for (int i = 0x20; i; i--) { CopyToVramLow(src, t, 0x20); src += 32; t += 0x80; } } void NMI_UploadGameOverText() { // 809038 CopyToVram(0x7800, &g_ram[0x2000], 0x800); CopyToVram(0x7d00, &g_ram[0x3400], 0x600); } void NMI_UpdatePegTiles() { // 80908b CopyToVram(0x3d00, &g_ram[0x10000], 0x100); } void NMI_UpdateStarTiles() { // 8090b7 CopyToVram(0x3ed0, &g_ram[0x10000], 0x40); } void HandleStripes14(const uint8 *p) { // 8092a1 while (!(p[0] & 0x80)) { uint16 vmem_addr = swap16(WORD(p[0])); uint8 vram_incr_amount = (p[2] & 0x80) >> 7; uint8 is_memset = p[2] & 0x40; // Cpu BUS Address Step (0=Increment, 2=Decrement, 1/3=Fixed) (DMA only) int len = (swap16(WORD(p[2])) & 0x3fff) + 1; p += 4; if (vram_incr_amount == 0) { uint16 *dst = &g_zenv.vram[vmem_addr]; if (is_memset) { uint16 v = p[0] | p[1] << 8; len = (len + 1) >> 1; for (int i = 0; i < len; i++) dst[i] = v; p += 2; } else { memcpy(dst, p, len); p += len; } } else { // increment vram by 32 instead of 1 uint16 *dst = &g_zenv.vram[vmem_addr]; if (is_memset) { uint16 v = p[0] | p[1] << 8; len = (len + 1) >> 1; for (int i = 0; i < len; i++, dst += 32) *dst = v; p += 2; } else { assert((len & 1) == 0); len >>= 1; for (int i = 0; i < len; i++, dst += 32, p += 2) WORD(*dst) = WORD(*p); } } } } void NMI_UpdateIRQGFX() { // 809347 if (nmi_flag_update_polyhedral) { memcpy(&g_zenv.vram[0x5800], &g_ram[0xe800], 0x800); nmi_flag_update_polyhedral = 0; } }