275 lines
8.0 KiB
C++
275 lines
8.0 KiB
C++
#include "rom.h"
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#include <compressions/alttpcompression.h>
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#include <rommapping.h>
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#include <cstddef>
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#include <cstring>
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#include <filesystem>
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#include <fstream>
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#include <iostream>
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#include <memory>
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#include <string>
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#include <vector>
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#include "app/core/common.h"
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#include "app/core/constants.h"
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#include "app/gfx/snes_tile.h"
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namespace yaze {
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namespace app {
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void ROM::Close() {
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if (is_loaded_) {
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delete[] current_rom_;
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for (auto i = 0; i < num_sheets_; i++) {
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delete[] decompressed_graphic_sheets_[i];
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delete[] converted_graphic_sheets_[i];
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}
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}
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}
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void ROM::SetupRenderer(std::shared_ptr<SDL_Renderer> renderer) {
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sdl_renderer_ = renderer;
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}
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// TODO: check if the rom has a header on load
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void ROM::LoadFromFile(const std::string &path) {
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std::ifstream file(path.c_str(), std::ios::binary);
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if (!file.is_open()) {
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std::cout << "Error: Could not open ROM file " << path << std::endl;
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return;
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}
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size_ = std::filesystem::file_size(path.c_str());
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current_rom_ = new uchar[size_];
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for (uint i = 0; i < size_; i++) {
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char byte_read_ = ' ';
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file.read(&byte_read_, sizeof(char));
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current_rom_[i] = byte_read_;
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}
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file.close();
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SDL_memcpy(title, current_rom_ + 32704, 20);
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is_loaded_ = true;
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}
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void ROM::LoadFromPointer(uchar *data) { current_rom_ = data; }
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// 0-112 -> compressed 3bpp bgr -> (decompressed each) 0x600 chars
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// 113-114 -> compressed 2bpp -> (decompressed each) 0x800 chars
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// 115-126 -> uncompressed 3bpp sprites -> (each) 0x600 chars
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// 127-217 -> compressed 3bpp sprites -> (decompressed each) 0x600 chars
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// 218-222 -> compressed 2bpp -> (decompressed each) 0x800 chars
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void ROM::LoadAllGraphicsData() {
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auto buffer = new uchar[346624];
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auto data = new uchar[2048];
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int buffer_pos = 0;
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for (int i = 0; i < core::NumberOfSheets; i++) {
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// uncompressed sheets
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if (i >= 115 && i <= 126) {
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data = new uchar[core::Uncompressed3BPPSize];
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int startAddress = GetGraphicsAddress(i);
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for (int j = 0; j < core::Uncompressed3BPPSize; j++) {
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data[j] = current_rom_[j + startAddress];
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}
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} else {
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auto gfx_addr = GetGraphicsAddress(i);
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data = Decompress(gfx_addr, core::UncompressedSheetSize);
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}
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gfx::Bitmap tilesheet_bmp(
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core::kTilesheetWidth, core::kTilesheetHeight,
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core::kTilesheetDepth, SNES3bppTo8bppSheet(data));
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tilesheet_bmp.CreateTexture(sdl_renderer_);
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graphics_bin_[i] = tilesheet_bmp;
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for (int j = 0; j < sizeof(data); j++) {
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buffer[j + buffer_pos] = data[j];
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}
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buffer_pos += sizeof(data);
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}
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master_gfx_bin_ = buffer;
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}
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uchar *ROM::DecompressGraphics(int pos, int size) {
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return Decompress(pos, size, false);
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}
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uchar *ROM::DecompressOverworld(int pos, int size) {
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return Decompress(pos, size, true);
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}
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uchar *ROM::Decompress(int pos, int size, bool reversed) {
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auto buffer = new uchar[size];
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uint length = 0;
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uint buffer_pos = 0;
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uchar cmd = 0;
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uchar databyte = current_rom_[pos];
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while (databyte != 0xFF) { // End of decompression
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databyte = current_rom_[pos];
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// Expanded Command
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if ((databyte & 0xE0) == 0xE0) {
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cmd = (uchar)((databyte >> 2) & 0x07);
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length =
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(ushort)(((current_rom_[pos] << 8) | current_rom_[pos + 1]) & 0x3FF);
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pos += 2; // Advance 2 bytes in ROM
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} else { // Normal Command
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cmd = (uchar)((databyte >> 5) & 0x07);
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length = (uchar)(databyte & 0x1F);
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pos += 1; // Advance 1 byte in ROM
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}
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length += 1; // each commands is at least of size 1 even if index 00
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switch (cmd) {
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case kCommandDirectCopy:
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for (int i = 0; i < length; i++) {
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buffer[buffer_pos++] = current_rom_[pos++];
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}
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// Do not advance in the ROM
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break;
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case kCommandByteFill:
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for (int i = 0; i < length; i++) {
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buffer[buffer_pos++] = current_rom_[pos];
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}
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pos += 1; // Advance 1 byte in the ROM
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break;
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case kCommandWordFill:
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for (int i = 0; i < length; i += 2) {
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buffer[buffer_pos++] = current_rom_[pos];
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buffer[buffer_pos++] = current_rom_[pos + 1];
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}
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pos += 2; // Advance 2 byte in the ROM
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break;
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case kCommandIncreasingFill: {
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uchar inc_byte = current_rom_[pos];
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for (int i = 0; i < length; i++) {
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buffer[buffer_pos++] = inc_byte++;
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}
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pos += 1; // Advance 1 byte in the ROM
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} break;
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case kCommandRepeatingBytes: {
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ushort s1 = ((current_rom_[pos + 1] & 0xFF) << 8);
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ushort s2 = ((current_rom_[pos] & 0xFF));
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// Reversed byte order for overworld maps
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if (reversed) {
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auto addr = (current_rom_[pos + 2]) | ((current_rom_[pos + 1]) << 8);
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if (addr > buffer_pos) {
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std::cout << "size error" << std::endl;
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}
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if (buffer_pos + length >= size) {
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size *= 2;
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buffer = new uchar[size];
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std::cout << "Reallocate buffer" << std::endl;
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}
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memcpy(buffer + buffer_pos, current_rom_ + pos, length);
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pos += 2;
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} else {
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auto addr = (ushort)(s1 | s2);
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for (int i = 0; i < length; i++) {
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buffer[buffer_pos] = buffer[addr + i];
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buffer_pos++;
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}
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pos += 2; // Advance 2 bytes in the ROM
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}
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} break;
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}
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}
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num_sheets_++;
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decompressed_graphic_sheets_.push_back(buffer);
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return buffer;
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}
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// 128x32
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uchar *ROM::SNES3bppTo8bppSheet(uchar *buffer_in, int sheet_id, int size) {
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// 8bpp sheet out
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auto sheet_buffer_out = new uchar[size];
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int xx = 0; // positions where we are at on the sheet
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int yy = 0;
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int pos = 0;
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int ypos = 0;
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if (sheet_id != 0) {
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yy = sheet_id;
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}
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// for each tiles
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// 16 per line
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for (int i = 0; i < 64; i++) {
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// for each line
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for (int y = 0; y < 8; y++) {
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//[0] + [1] + [16]
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for (int x = 0; x < 8; x++) {
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auto b1 = ((buffer_in[(y * 2) + (24 * pos)] & (kGraphicsBitmap[x])));
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auto b2 =
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(buffer_in[((y * 2) + (24 * pos)) + 1] & (kGraphicsBitmap[x]));
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auto b3 = (buffer_in[(16 + y) + (24 * pos)] & (kGraphicsBitmap[x]));
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unsigned char b = 0;
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if (b1 != 0) {
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b |= 1;
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}
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if (b2 != 0) {
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b |= 2;
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}
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if (b3 != 0) {
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b |= 4;
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}
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sheet_buffer_out[x + (xx) + (y * 128) + (yy * 1024)] = b;
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}
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}
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pos++;
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ypos++;
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xx += 8;
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if (ypos >= 16) {
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yy++;
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xx = 0;
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ypos = 0;
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}
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}
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converted_graphic_sheets_.push_back(sheet_buffer_out);
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return sheet_buffer_out;
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}
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uint ROM::GetGraphicsAddress(uint8_t offset) const {
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uint snes_address = 0;
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uint pc_address = 0;
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snes_address = (uint)((((current_rom_[0x4F80 + offset]) << 16) |
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((current_rom_[0x505F + offset]) << 8) |
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((current_rom_[0x513E + offset]))));
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pc_address = core::SnesToPc(snes_address);
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return pc_address;
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}
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SDL_Texture *ROM::DrawGraphicsSheet(int offset) {
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SDL_Surface *surface =
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SDL_CreateRGBSurfaceWithFormat(0, 128, 32, 8, SDL_PIXELFORMAT_INDEX8);
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std::cout << "Drawing surface #" << offset << std::endl;
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uchar *sheet_buffer = nullptr;
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for (int i = 0; i < 8; i++) {
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surface->format->palette->colors[i].r = i * 31;
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surface->format->palette->colors[i].g = i * 31;
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surface->format->palette->colors[i].b = i * 31;
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}
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uint graphics_address = GetGraphicsAddress(offset);
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std::cout << "Decompressing..." << std::endl;
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auto decomp = Decompress(graphics_address);
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std::cout << "Converting to 8bpp sheet..." << std::endl;
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sheet_buffer = SNES3bppTo8bppSheet(decomp);
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std::cout << "Assigning pixel data..." << std::endl;
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surface->pixels = sheet_buffer;
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std::cout << "Creating texture from surface..." << std::endl;
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SDL_Texture *sheet_texture = nullptr;
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sheet_texture = SDL_CreateTextureFromSurface(sdl_renderer_.get(), surface);
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if (sheet_texture == nullptr) {
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std::cout << "Error: " << SDL_GetError() << std::endl;
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}
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return sheet_texture;
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}
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} // namespace app
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} // namespace yaze
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