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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
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