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dds.cpp
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dds.cpp
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/*
Copyright (C) 2001-2006, William Joseph.
All Rights Reserved.
This file is part of GtkRadiant.
GtkRadiant 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 2 of the License, or
(at your option) any later version.
GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "dds.h"
#include <stdlib.h>
#include <algorithm>
#include <map>
#include "ifilesystem.h"
#include "iarchive.h"
#include "idatastream.h"
#include "ddslib.h"
#include "util/Noncopyable.h"
#include "RGBAImage.h"
namespace image
{
// Metadata for a single MipMap level
struct MipMapInfo
{
std::size_t width; // pixel width
std::size_t height; // pixel height
std::size_t size; // memory size used by this mipmap
std::size_t offset; // offset in _pixelData to the beginning of this mipmap
MipMapInfo() :
width(0),
height(0),
size(0),
offset(0)
{}
};
typedef std::vector<MipMapInfo> MipMapInfoList;
// Image subclass for DDS images
class DDSImage: public Image, public util::Noncopyable
{
// The actual pixels
mutable std::vector<uint8_t> _pixelData;
// The GL format of the texture data, and a boolean flag to indicate if we
// need to upload with glCompressedTexImage2D rather than glTexImage2D
GLenum _format = 0;
bool _compressed = true;
// Metadata for each mipmap. All pixel data is stored in _pixelData, with
// the offset to each mipmap stored in the _mipMapInfo list.
MipMapInfoList _mipMapInfo;
public:
// Pass the required memory size to the constructor
DDSImage(std::size_t size): _pixelData(size)
{}
// Set the compression format
void setFormat(GLenum format, bool compressed)
{
_format = format;
_compressed = compressed;
}
// Add a new mipmap with the given parameters and return a pointer to its
// allocated byte data
uint8_t* addMipMap(std::size_t width, std::size_t height,
std::size_t size, std::size_t offset)
{
// Create the MipMapInfo metadata and store it in our list
MipMapInfo info;
info.size = size;
info.width = width;
info.height = height;
info.offset = offset;
_mipMapInfo.push_back(info);
// Return the absolute pointer to the new mipmap's byte data
assert(offset < _pixelData.size());
return _pixelData.data() + offset;
}
/* Image implementation */
uint8_t* getPixels() const override { return _pixelData.data(); }
std::size_t getWidth() const override { return _mipMapInfo[0].width; }
std::size_t getHeight() const override { return _mipMapInfo[0].height; }
/* BindableTexture implementation */
TexturePtr bindTexture(const std::string& name) const
{
GLuint textureNum;
debug::assertNoGlErrors();
// Allocate a new texture number and store it into the Texture structure
glGenTextures(1, &textureNum);
glBindTexture(GL_TEXTURE_2D, textureNum);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_FALSE);
for (std::size_t i = 0; i < _mipMapInfo.size(); ++i)
{
const MipMapInfo& mipMap = _mipMapInfo[i];
if (_compressed)
{
glCompressedTexImage2D(
GL_TEXTURE_2D, static_cast<GLint>(i), _format,
static_cast<GLsizei>(mipMap.width),
static_cast<GLsizei>(mipMap.height),
0, static_cast<GLsizei>(mipMap.size),
_pixelData.data() + mipMap.offset
);
}
else
{
// For uncompressed textures the format specifies the layout in
// memory, not the internal format we want OpenGL to use (which
// is always GL_RGB).
glTexImage2D(
GL_TEXTURE_2D, static_cast<GLint>(i), GL_RGB,
static_cast<GLsizei>(mipMap.width),
static_cast<GLsizei>(mipMap.height),
0, _format, GL_UNSIGNED_BYTE,
_pixelData.data() + mipMap.offset
);
}
// Handle unsupported format error
if (glGetError() == GL_INVALID_ENUM)
{
rError() << "[DDSImage] Unable to bind texture '" << name
<< "': unsupported texture format " << _format
<< (_compressed ? " (compressed)" : " (uncompressed)")
<< std::endl;
return TexturePtr();
}
debug::assertNoGlErrors();
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, static_cast<GLint>(_mipMapInfo.size() - 1));
// Un-bind the texture
glBindTexture(GL_TEXTURE_2D, 0);
// Create and return texture object
BasicTexture2DPtr texObj(new BasicTexture2D(textureNum, name));
texObj->setWidth(getWidth());
texObj->setHeight(getHeight());
debug::assertNoGlErrors();
return texObj;
}
bool isPrecompressed() const {
return true;
}
};
typedef std::shared_ptr<DDSImage> DDSImagePtr;
// Map DDS FOURCC values to GLenum compression formats
static const std::map<std::string, GLenum> GL_FMT_FOR_FOURCC
{
{ "DXT1", GL_COMPRESSED_RGBA_S3TC_DXT1_EXT },
{ "DXT3", GL_COMPRESSED_RGBA_S3TC_DXT3_EXT },
{ "DXT5", GL_COMPRESSED_RGBA_S3TC_DXT5_EXT },
};
// Map uncompressed DDS bit depths to GLenum memory layouts
static const std::map<int, GLenum> GL_FMT_FOR_BITDEPTH
{
{ 24, GL_RGB },
{ 32, GL_RGBA }
};
DDSImagePtr LoadDDSFromStream(InputStream& stream)
{
// Load the header
typedef StreamBase::byte_type byteType;
DDSHeader header;
stream.read(reinterpret_cast<byteType*>(&header), sizeof(header));
// Reject any invalid DDS structure
if (!header.isValid())
{
rError() << "Invalid DDS header" << std::endl;
}
// Extract basic metadata: width, height, format and mipmap count
int width = header.getWidth(), height = header.getHeight();
std::string compressionFormat = header.getCompressionFormat();
int bitDepth = header.getRGBBits();
std::size_t mipMapCount = header.getMipMapCount();
MipMapInfoList mipMapInfo;
mipMapInfo.resize(mipMapCount);
// Calculate the total memory requirements (greebo: DXT1 has 8 bytes per block)
std::size_t blockBytes = (compressionFormat == "DXT1") ? 8 : 16;
std::size_t size = 0;
std::size_t offset = 0;
for (std::size_t i = 0; i < mipMapCount; ++i)
{
// Create a new mipmap structure
MipMapInfo& mipMap = mipMapInfo[i];
mipMap.offset = offset;
mipMap.width = width;
mipMap.height = height;
// Calculate size in bytes for this mipmap. For compressed formats,
// this is based on the block size, otherwise it derives from the bytes
// per pixel.
if (header.isCompressed())
mipMap.size = std::max( width, 4 ) / 4 * std::max( height, 4 ) / 4 * blockBytes;
else
mipMap.size = width * height * (bitDepth / 8);
// Update the offset for the next mipmap
offset += mipMap.size;
// Increase the size counter
size += mipMap.size;
// Go to the next mipmap
width = (width+1) >> 1;
height = (height+1) >> 1;
}
// Allocate a new DDS image with that size
DDSImagePtr image(new DDSImage(size));
// Set the format of this DDS image
if (GL_FMT_FOR_FOURCC.count(compressionFormat) == 1)
image->setFormat(GL_FMT_FOR_FOURCC.at(compressionFormat), true);
else if (GL_FMT_FOR_BITDEPTH.count(bitDepth) == 1)
image->setFormat(GL_FMT_FOR_BITDEPTH.at(bitDepth), false);
else
rError() << "Unknown DDS format (" << compressionFormat << ")" << std::endl;
// Load the mipmaps into the allocated memory
for (std::size_t i = 0; i < mipMapInfo.size(); ++i)
{
const MipMapInfo& mipMap = mipMapInfo[i];
// Declare a new mipmap and store the offset
uint8_t* mipMapBytes = image->addMipMap(mipMap.width, mipMap.height,
mipMap.size, mipMap.offset);
// Read the data into the DDSImage's memory
std::size_t bytesRead = stream.read(
reinterpret_cast<byteType*>(mipMapBytes), mipMap.size
);
assert(bytesRead == mipMap.size);
}
return image;
}
ImagePtr LoadDDS(ArchiveFile& file) {
return LoadDDSFromStream(file.getInputStream());
}
ImagePtr DDSLoader::load(ArchiveFile& file) const
{
// Pass the call to the according load function
return LoadDDS(file);
}
ImageTypeLoader::Extensions DDSLoader::getExtensions() const
{
Extensions extensions;
extensions.push_back("dds");
return extensions;
}
}