Reoragnize V2 functions in ROM
This commit is contained in:
Justin Scofield
311
src/app/rom.cc
311
src/app/rom.cc
@@ -40,6 +40,159 @@ absl::Status ROM::OpenFromFile(const absl::string_view &filename) {
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return absl::OkStatus();
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}
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absl::Status ROM::LoadAllGraphicsDataV2() {
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Bytes sheet;
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int buffer_pos = 0;
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for (int i = 0; i < core::NumberOfSheets; i++) {
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if (i >= 115 && i <= 126) { // uncompressed sheets
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sheet.resize(core::Uncompressed3BPPSize);
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auto offset = GetGraphicsAddress(i);
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for (int j = 0; j < core::Uncompressed3BPPSize; j++) {
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sheet[j] = rom_data_[j + offset];
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}
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} else {
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auto offset = GetGraphicsAddress(i);
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absl::StatusOr<Bytes> new_sheet =
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DecompressV2(offset, core::UncompressedSheetSize);
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if (!new_sheet.ok()) {
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return new_sheet.status();
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} else {
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sheet = std::move(*new_sheet);
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}
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}
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absl::StatusOr<Bytes> converted_sheet = Convert3bppTo8bppSheet(sheet);
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if (!converted_sheet.ok()) {
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return converted_sheet.status();
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} else {
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Bytes result = std::move(*converted_sheet);
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gfx::Bitmap tilesheet_bmp(core::kTilesheetWidth, core::kTilesheetHeight,
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core::kTilesheetDepth, result.data());
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tilesheet_bmp.CreateTexture(renderer_);
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graphics_bin_v2_[i] = tilesheet_bmp;
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}
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}
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return absl::OkStatus();
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}
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absl::StatusOr<Bytes> ROM::DecompressV2(int offset, int size, bool reversed) {
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Bytes buffer(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 = rom_data_[offset];
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while (databyte != 0xFF) { // End of decompression
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databyte = rom_data_[offset];
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if ((databyte & 0xE0) == 0xE0) { // Expanded Command
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cmd = ((databyte >> 2) & 0x07);
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length = (((rom_data_[offset] << 8) | rom_data_[offset + 1]) & 0x3FF);
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offset += 2; // Advance 2 bytes in ROM
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} else { // Normal Command
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cmd = ((databyte >> 5) & 0x07);
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length = (databyte & 0x1F);
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offset += 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: // Does not advance in the ROM
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for (int i = 0; i < length; i++)
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buffer[buffer_pos++] = rom_data_[offset++];
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break;
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case kCommandByteFill: // Advances 1 byte in the ROM
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for (int i = 0; i < length; i++)
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buffer[buffer_pos++] = rom_data_[offset];
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offset += 1;
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break;
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case kCommandWordFill: // Advance 2 byte in the ROM
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for (int i = 0; i < length; i += 2) {
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buffer[buffer_pos++] = rom_data_[offset];
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buffer[buffer_pos++] = rom_data_[offset + 1];
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}
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offset += 2;
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break;
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case kCommandIncreasingFill: {
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uchar inc_byte = rom_data_[offset];
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for (int i = 0; i < length; i++) buffer[buffer_pos++] = inc_byte++;
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offset += 1; // Advance 1 byte in the ROM
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} break;
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case kCommandRepeatingBytes: {
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ushort s1 = ((rom_data_[offset + 1] & 0xFF) << 8);
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ushort s2 = ((rom_data_[offset] & 0xFF));
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if (reversed) { // Reversed byte order for overworld maps
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auto addr = (rom_data_[offset + 2]) | ((rom_data_[offset + 1]) << 8);
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if (addr > buffer_pos) {
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return absl::InternalError(absl::StrFormat(
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"DecompressOverworldV2: Offset for command copy exceeds "
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"current position (Offset : %#04x | Pos : %#06x)\n",
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addr, buffer_pos));
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}
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if (buffer_pos + length >= size) {
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size *= 2;
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buffer.resize(size);
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}
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memcpy(buffer.data() + buffer_pos, rom_data_.data() + offset, length);
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offset += 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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offset += 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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return buffer;
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}
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absl::StatusOr<Bytes> ROM::Convert3bppTo8bppSheet(Bytes sheet, int size) {
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Bytes sheet_buffer_out(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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// for each tiles, 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 = ((sheet[(y * 2) + (24 * pos)] & (kGraphicsBitmap[x])));
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auto b2 = (sheet[((y * 2) + (24 * pos)) + 1] & (kGraphicsBitmap[x]));
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auto b3 = (sheet[(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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return sheet_buffer_out;
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}
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// ----------------------------------------------------------------------------
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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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@@ -113,42 +266,6 @@ void ROM::LoadAllGraphicsData() {
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master_gfx_bin_ = buffer;
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}
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absl::Status ROM::LoadAllGraphicsDataV2() {
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Bytes sheet;
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int buffer_pos = 0;
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for (int i = 0; i < core::NumberOfSheets; i++) {
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if (i >= 115 && i <= 126) { // uncompressed sheets
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sheet.resize(core::Uncompressed3BPPSize);
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auto offset = GetGraphicsAddress(i);
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for (int j = 0; j < core::Uncompressed3BPPSize; j++) {
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sheet[j] = rom_data_[j + offset];
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}
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} else {
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auto offset = GetGraphicsAddress(i);
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absl::StatusOr<Bytes> new_sheet =
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DecompressV2(offset, core::UncompressedSheetSize);
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if (!new_sheet.ok()) {
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return new_sheet.status();
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} else {
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sheet = std::move(*new_sheet);
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}
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}
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absl::StatusOr<Bytes> converted_sheet = Convert3bppTo8bppSheet(sheet);
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if (!converted_sheet.ok()) {
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return converted_sheet.status();
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} else {
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Bytes result = std::move(*converted_sheet);
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gfx::Bitmap tilesheet_bmp(core::kTilesheetWidth, core::kTilesheetHeight,
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core::kTilesheetDepth, result.data());
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tilesheet_bmp.CreateTexture(renderer_);
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graphics_bin_v2_[i] = tilesheet_bmp;
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}
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}
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return absl::OkStatus();
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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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@@ -246,128 +363,6 @@ uchar *ROM::Decompress(int pos, int size, bool reversed) {
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return buffer;
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}
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absl::StatusOr<Bytes> ROM::DecompressV2(int offset, int size, bool reversed) {
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Bytes buffer(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 = rom_data_[offset];
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while (databyte != 0xFF) { // End of decompression
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databyte = rom_data_[offset];
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// Expanded Command
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if ((databyte & 0xE0) == 0xE0) {
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cmd = ((databyte >> 2) & 0x07);
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length = (((rom_data_[offset] << 8) | rom_data_[offset + 1]) & 0x3FF);
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offset += 2; // Advance 2 bytes in ROM
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} else { // Normal Command
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cmd = ((databyte >> 5) & 0x07);
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length = (databyte & 0x1F);
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offset += 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++] = rom_data_[offset++];
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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++] = rom_data_[offset];
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offset += 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++] = rom_data_[offset];
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buffer[buffer_pos++] = rom_data_[offset + 1];
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}
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offset += 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 = rom_data_[offset];
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for (int i = 0; i < length; i++) buffer[buffer_pos++] = inc_byte++;
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offset += 1; // Advance 1 byte in the ROM
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} break;
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case kCommandRepeatingBytes: {
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ushort s1 = ((rom_data_[offset + 1] & 0xFF) << 8);
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ushort s2 = ((rom_data_[offset] & 0xFF));
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// Reversed byte order for overworld maps
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if (reversed) {
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auto addr = (rom_data_[offset + 2]) | ((rom_data_[offset + 1]) << 8);
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if (addr > buffer_pos) {
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return absl::InternalError(
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absl::StrFormat("DecompressOverworldV2: Offset for command "
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"copy existing is larger than the current "
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"position (Offset : %#04x | Pos %#06x\n",
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addr, buffer_pos));
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}
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if (buffer_pos + length >= size) {
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size *= 2;
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buffer.resize(size);
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std::cout << "DecompressOverworldV2: Reallocating buffer";
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}
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memcpy(buffer.data() + buffer_pos, rom_data_.data() + offset, length);
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offset += 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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offset += 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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return buffer;
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}
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absl::StatusOr<Bytes> ROM::Convert3bppTo8bppSheet(Bytes sheet, int size) {
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Bytes sheet_buffer_out(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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// for each tiles, 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 = ((sheet[(y * 2) + (24 * pos)] & (kGraphicsBitmap[x])));
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auto b2 = (sheet[((y * 2) + (24 * pos)) + 1] & (kGraphicsBitmap[x]));
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auto b3 = (sheet[(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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return sheet_buffer_out;
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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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