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Suported for mip mapping added by Rune.

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This commit is contained in:
Robert Osfield
2003-04-03 21:00:12 +00:00
parent a47a6f0310
commit 7473bf573d
1 changed files with 110 additions and 33 deletions
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143
src/osgPlugins/dds/ReaderWriterDDS.cpp
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@@ -110,6 +110,10 @@ typedef struct _DDSURFACEDESC2
unsigned long dwTextureStage;
} DDSURFACEDESC2;
#define DDPF_ALPHAPIXELS 0x00000001l
#define DDPF_FOURCC 0x00000004l
#define DDPF_RGB 0x00000040l
#ifndef MAKEFOURCC
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
((unsigned long)(char)(ch0) | ((unsigned long)(char)(ch1) << 8) | \
@@ -125,6 +129,15 @@ typedef struct _DDSURFACEDESC2
#define FOURCC_DXT4 (MAKEFOURCC('D','X','T','4'))
#define FOURCC_DXT5 (MAKEFOURCC('D','X','T','5'))
void shiftAlpha(int*imageData, int size){
for(int i=0;i<size/4;i++){
imageData[i] = imageData[i]<<8;
}
}
osg::Image* ReadDDSFile(const char *filename)
{
osg::Image* osgImage = new osg::Image();
@@ -161,44 +174,108 @@ osg::Image* ReadDDSFile(const char *filename)
int t = ddsd.dwHeight;
int r = 1; // we're not a 3d texture...
unsigned int dataType = GL_UNSIGNED_BYTE;
unsigned int pixelFormat;
unsigned int internalFormat;
switch(ddsd.ddpfPixelFormat.dwFourCC)
unsigned int pixelFormat = 0;
unsigned int internalFormat = 0;
// Uncompressed formats will usually use DDPF_RGB to indicate an RGB format,
// while compressed formats will use DDPF_FOURCC with a four-character code.
// Uncompressed formats.
if(ddsd.ddpfPixelFormat.dwFlags & DDPF_RGB)
{
case FOURCC_DXT1:
internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
pixelFormat = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
break;
case FOURCC_DXT3:
internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
pixelFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
break;
case FOURCC_DXT5:
internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
pixelFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
break;
default:
delete [] imageData;
return NULL;
bool usingAlpha = ddsd.ddpfPixelFormat.dwFlags & DDPF_ALPHAPIXELS;
switch(ddsd.ddpfPixelFormat.dwRGBBitCount)
{
case 32:
internalFormat = usingAlpha ? 4 : 3;
pixelFormat = usingAlpha ? GL_RGBA : GL_RGB;
break;
case 24:
case 16:
default:
delete [] imageData;
return NULL;
}
}
// Compressed formats.
else if(ddsd.ddpfPixelFormat.dwFlags & DDPF_FOURCC)
{
switch(ddsd.ddpfPixelFormat.dwFourCC)
{
case FOURCC_DXT1:
internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
pixelFormat = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
break;
case FOURCC_DXT3:
internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
pixelFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
break;
case FOURCC_DXT5:
internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
pixelFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
break;
default:
delete [] imageData;
return NULL;
}
}
else
{
osg::notify(osg::WARN)<<"Warning:: unhanlded pixel format in dds file, image not loaded."<<std::endl;
delete [] imageData;
return NULL;
}
// Take care of mipmaps if any.
if (ddsd.dwMipMapCount>1)
{
osg::notify(osg::WARN)<<"Warning: Mipmaps in dds file are ignored."<<std::endl;
// this is code from the txp plugin, so won't compile here, but it'll be useful guide
// to implementing the real mip mapping code.
// // now set mipmap data (offsets into image raw data)
// Image::MipmapDataType mipmaps;
// // number of offsets in osg is one less than num_mipmaps
// // because it's assumed that first offset iz 0
// mipmaps.resize(num_mipmaps-1);
// for( int k = 1 ; k < num_mipmaps;k++ )
// {
// mipmaps[k-1] = tmp_tex->MipLevelOffset(k);
// }
// image->setMipmapData(mipmaps);
// Now set mipmap data (offsets into image raw data).
osg::Image::MipmapDataType mipmaps;
// Number of offsets in osg is one less than num_mipmaps
// because it's assumed that first offset is 0.
mipmaps.resize(ddsd.dwMipMapCount-1);
// Handle compressed mipmaps.
if(ddsd.ddpfPixelFormat.dwFlags & DDPF_FOURCC)
{
int width = ddsd.dwWidth;
int height = ddsd.dwHeight;
int blockSize = (pixelFormat == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) ? 8 : 16;
int offset = 0;
for (unsigned int k = 1; k < ddsd.dwMipMapCount && (width || height); ++k)
{
if (width == 0)
width = 1;
if (height == 0)
height = 1;
size = ((width+3)/4)*((height+3)/4)*blockSize;
offset += size;
mipmaps[k-1] = offset;
width >>= 1;
height >>= 1;
}
osgImage->setMipmapData(mipmaps);
}
// Handle uncompressed mipmaps
if(ddsd.ddpfPixelFormat.dwFlags & DDPF_RGB)
{
int offset = 0;
int width = ddsd.dwWidth;
int height = ddsd.dwHeight;
for (unsigned int k = 1; k < ddsd.dwMipMapCount && (width || height); ++k)
{
if (width == 0)
width = 1;
if (height == 0)
height = 1;
size = s*t*(ddsd.ddpfPixelFormat.dwRGBBitCount/8);
offset += size;
mipmaps[k-1] = offset;
width >>= 1;
height >>= 1;
}
osgImage->setMipmapData(mipmaps);
}
}
// Set image data and properties.