Initial commit

engines/watchmaker/3d/dds_header.cpp

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+/* ScummVM - Graphic Adventure Engine
+*
+* ScummVM is the legal property of its developers, whose names
+* are too numerous to list here. Please refer to the COPYRIGHT
+* file distributed with this source distribution.
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+ */
+
+#include "common/textconsole.h"
+#include "common/ptr.h"
+#include "watchmaker/3d/dds_header.h"
+
+namespace Watchmaker {
+
+DDSHeader::DDSHeader(Common::SeekableReadStream &stream) {
+	//warning("TODO: Implement DDS Header parsing");
+	uint32 retv = MKTAG(' ', 'S', 'D', 'D');
+	uint32 magic = stream.readUint32LE();
+	if (magic != retv) {
+		error("parseDDSHeader: Wrong Magic, expected %08X, got %08X\n", retv, magic);
+	}
+	// The size counts the datastructure, which doesn't include the magic
+	int initialPos = stream.pos();
+	uint32 size = stream.readUint32LE();
+	/*uint32 flags = */ stream.readUint32LE();
+	this->height = stream.readUint32LE();
+	this->width = stream.readUint32LE();
+	/*uint32 dataSize = */ stream.readUint32LE();
+	stream.seek(13 * 4, SEEK_CUR);
+	stream.readUint32LE();
+	uint32 pfFlags = stream.readUint32LE();
+	assert(pfFlags & 0x4); // For now we assume compressed DDS only.
+	compression = (DxtCompression)stream.readUint32LE();
+	// Since we're ignoring a fair amount of header, we still need to position
+	// ourselves as if we read it.
+	stream.seek(initialPos + size, SEEK_SET);
+}
+
+uint32 blockSize(DxtCompression compression) {
+	switch (compression) {
+	case DxtCompression::DXT1:
+		return 8;
+	default:
+		return 16;
+	}
+}
+
+uint32 DDSHeader::dataSize() const {
+	int blockCount = ceil(width / 4.0) * ceil(height / 4.0);
+	return blockCount * blockSize(compression);
+}
+
+class DDSTextureData : public TextureData {
+private:
+	unsigned int _dataSize = 0;
+	byte *_data = nullptr;
+	DDSHeader _header;
+public:
+	DDSTextureData(byte *data, uint32 dataSize, DDSHeader header) : TextureData(header.compression),
+		_data(data),
+		_dataSize(dataSize),
+		_header(header) {}
+	~DDSTextureData() override {
+		delete[] _data;
+	}
+	int getWidth() const override {
+		return _header.width;
+	}
+	int getHeight() const override {
+		return _header.height;
+	}
+	int getDataSize() const override {
+		return _dataSize;
+	}
+	const void *getData() const override {
+		return _data;
+	}
+};
+
+Common::SharedPtr<TextureData> loadDdsTexture(Common::SeekableReadStream &stream) {
+	DDSHeader header(stream);
+	return loadDdsTexture(stream, header);
+}
+
+Common::SharedPtr<TextureData> loadDdsTexture(Common::SeekableReadStream &stream, DDSHeader &header) {
+	assert(header.width > 0);
+	unsigned char *data = new unsigned char[header.dataSize()]();
+	stream.read(data, header.dataSize());
+	return Common::SharedPtr<TextureData>(new DDSTextureData(data, header.dataSize(), header));
+}
+
+} // End of namespace Watchmaker