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