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From Rune Schmidt Jensen - new dds loader.

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This commit is contained in:
Robert Osfield
2003-04-02 18:26:34 +00:00
parent 161c40d75f
commit 0f3eaeba46
11 changed files with 433 additions and 3 deletions
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54
src/osg/Image.cpp
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@@ -141,6 +141,9 @@ unsigned int Image::computeNumComponents(GLenum format)
{
switch(format)
{
case(GL_COMPRESSED_RGB_S3TC_DXT1_EXT): return 3;
case(GL_COMPRESSED_RGBA_S3TC_DXT3_EXT): return 4;
case(GL_COMPRESSED_RGBA_S3TC_DXT5_EXT): return 4;
case(GL_COLOR_INDEX): return 1;
case(GL_STENCIL_INDEX): return 1;
case(GL_DEPTH_COMPONENT): return 1;
@@ -163,6 +166,12 @@ unsigned int Image::computePixelSizeInBits(GLenum format,GLenum type)
{
switch(type)
{
case(GL_COMPRESSED_RGB_S3TC_DXT1_EXT): return 4;
case(GL_COMPRESSED_RGBA_S3TC_DXT3_EXT): return 8;
case(GL_COMPRESSED_RGBA_S3TC_DXT5_EXT): return 8;
case(GL_BITMAP): return computeNumComponents(format);
case(GL_BYTE):
@@ -320,6 +329,51 @@ void Image::readPixels(int x,int y,int width,int height,
}
void Image::readImageFromCurrentTexture(unsigned int contextID)
{
const osg::Texture::Extensions* extensions = osg::Texture::getExtensions(contextID,true);
GLint internalformat;
GLint width;
GLint height;
if (extensions->isCompressedTexImage2DSupported())
{
GLint compressed;
GLint compressed_size;
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB,&compressed);
/* if the compression has been successful */
if (compressed == GL_TRUE)
{
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &compressed_size);
allocateImage(width,height,1,internalformat,internalformat);
extensions->glGetCompressedTexImage(GL_TEXTURE_2D, 0, _data);
return;
}
}
// non compressed texture implemention.
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internalformat);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
allocateImage(width,height,1,internalformat,GL_UNSIGNED_BYTE);
_internalTextureFormat = internalformat;
glGetTexImage(GL_TEXTURE_2D,0,_pixelFormat,_dataType,_data);
}
void Image::scaleImage(int s,int t,int r)
{
if (_s==s && _t==t && _r==r) return;

14
src/osg/Texture.cpp
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@@ -918,7 +918,7 @@ void Texture::Extensions::setupGLExtenions()
_glCompressedTexImage2D = getGLExtensionFuncPtr("glCompressedTexImage2D","glCompressedTexImage2DARB");
_glCompressedTexSubImage2D = getGLExtensionFuncPtr("glCompressedTexSubImage2D","glCompressedTexSubImage2DARB");;
_glGetCompressedTexImage = getGLExtensionFuncPtr("glGetCompressedTexImage","glGetCompressedTexImageARB");;
}
void Texture::Extensions::glCompressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid *data) const
@@ -948,3 +948,15 @@ void Texture::Extensions::glCompressedTexSubImage2D(GLenum target, GLint level,
}
}
void Texture::Extensions::glGetCompressedTexImage(GLenum target, GLint level, GLvoid *data) const
{
if (_glGetCompressedTexImage)
{
typedef void (APIENTRY * GetCompressedTexImageArbProc) (GLenum target, GLint level, GLvoid *data);
((GetCompressedTexImageArbProc)_glGetCompressedTexImage)(target, level, data);
}
else
{
notify(WARN)<<"Error: glGetCompressedTexImage not supported by OpenGL driver"<<std::endl;
}
}

13
src/osgPlugins/dds/GNUmakefile Normal file
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@@ -0,0 +1,13 @@
TOPDIR = ../../..
include $(TOPDIR)/Make/makedefs
CXXFILES =\
ReaderWriterDDS.cpp\
LIBS += $(OSG_LIBS) $(OTHER_LIBS)
TARGET_BASENAME = dds
include $(TOPDIR)/Make/cygwin_plugin_def
PLUGIN = $(PLUGIN_PREFIX)$(TARGET_BASENAME).$(PLUGIN_EXT)
include $(TOPDIR)/Make/makerules

209
src/osgPlugins/dds/ReaderWriterDDS.cpp Normal file
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@@ -0,0 +1,209 @@
/**********************************************************************
*
* FILE: ReaderWriterdds.cpp
*
* DESCRIPTION: Class for reading a DDS file into an osg::Image.
*
* Example on reading a DDS file code can be found at:
* http://developer.nvidia.com/docs/IO/1327/ATT/
* ARB_texture_compression.pdf
* Author: S<>bastien Domin<69>, NVIDIA Corporation
*
* CREATED BY: Rune Schmidt Jensen, rsj@uni-dk
*
* HISTORY: Created 31.03.2003
*
**********************************************************************/
#include <osg/Texture>
#include <osgDB/Registry>
#include <osgDB/FileNameUtils>
#include <stdio.h>
// NOTICE ON WIN32:
// typedef DWORD unsigned long;
// sizeof(DWORD) = 4
typedef struct _DDCOLORKEY
{
unsigned long dwColorSpaceLowValue;
unsigned long dwColorSpaceHighValue;
} DDCOLORKEY;
typedef struct _DDPIXELFORMAT
{
unsigned long dwSize;
unsigned long dwFlags;
unsigned long dwFourCC;
union
{
unsigned long dwRGBBitCount;
unsigned long dwYUVBitCount;
unsigned long dwZBufferBitDepth;
unsigned long dwAlphaBitDepth;
};
union
{
unsigned long dwRBitMask;
unsigned long dwYBitMask;
};
union
{
unsigned long dwGBitMask;
unsigned long dwUBitMask;
};
union
{
unsigned long dwBBitMask;
unsigned long dwVBitMask;
};
union
{
unsigned long dwRGBAlphaBitMask;
unsigned long dwYUVAlphaBitMask;
unsigned long dwRGBZBitMask;
unsigned long dwYUVZBitMask;
};
} DDPIXELFORMAT;
typedef struct _DDSCAPS2
{
unsigned long dwCaps;
unsigned long dwCaps2;
unsigned long dwCaps3;
union
{
unsigned long dwCaps4;
unsigned long dwVolumeDepth;
};
} DDSCAPS2;
typedef struct _DDSURFACEDESC2 {
unsigned long dwSize;
unsigned long dwFlags;
unsigned long dwHeight;
unsigned long dwWidth;
union
{
long lPitch;
unsigned long dwLinearSize;
};
unsigned long dwBackBufferCount;
union
{
unsigned long dwMipMapCount;
unsigned long dwRefreshRate;
};
unsigned long dwAlphaBitDepth;
unsigned long dwReserved;
unsigned long* lpSurface;
DDCOLORKEY ddckCKDestOverlay;
DDCOLORKEY ddckCKDestBlt;
DDCOLORKEY ddckCKSrcOverlay;
DDCOLORKEY ddckCKSrcBlt;
DDPIXELFORMAT ddpfPixelFormat;
DDSCAPS2 ddsCaps;
unsigned long dwTextureStage;
} DDSURFACEDESC2;
#ifndef MAKEFOURCC
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
((unsigned long)(char)(ch0) | ((unsigned long)(char)(ch1) << 8) | \
((unsigned long)(char)(ch2) << 16) | ((unsigned long)(char)(ch3) << 24 ))
#endif //defined(MAKEFOURCC)
/*
* FOURCC codes for DX compressed-texture pixel formats
*/
#define FOURCC_DXT1 (MAKEFOURCC('D','X','T','1'))
#define FOURCC_DXT2 (MAKEFOURCC('D','X','T','2'))
#define FOURCC_DXT3 (MAKEFOURCC('D','X','T','3'))
#define FOURCC_DXT4 (MAKEFOURCC('D','X','T','4'))
#define FOURCC_DXT5 (MAKEFOURCC('D','X','T','5'))
osg::Image* ReadDDSFile(const char *filename){
osg::Image* osgImage = new osg::Image();
DDSURFACEDESC2 ddsd;
char filecode[4];
FILE *fp;
// Open file.
fp = fopen(filename, "rb");
if (fp == NULL)
return NULL;
// Verify that this is a DDS file.
fread(filecode, 1, 4, fp);
if (strncmp(filecode, "DDS ", 4) != 0) {
fclose(fp);
return NULL;
}
// Get the surface desc.
fread(&ddsd, sizeof(ddsd), 1, fp);
// Read image data.
unsigned int size = ddsd.dwMipMapCount > 1 ? ddsd.dwLinearSize * 2 : ddsd.dwLinearSize;
unsigned char* imageData = (unsigned char*) malloc(size * sizeof(unsigned char));
fread(imageData, 1, size, fp);
// Close the file.
fclose(fp);
// Retreive image properties.
int s = ddsd.dwWidth;
int t = ddsd.dwHeight;
int r = ddsd.dwMipMapCount>1?ddsd.dwMipMapCount:0;
unsigned int dataType = GL_UNSIGNED_BYTE;
unsigned int pixelFormat;
unsigned int internalFormat;
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:
free(imageData);
return NULL;
}
// Set image data and properties.
osgImage->setImage(s,t,r, internalFormat, pixelFormat, dataType, imageData, osg::Image::USE_NEW_DELETE);
// Return Image.
return osgImage;
}
class ReaderWriterDDS : public osgDB::ReaderWriter
{
public:
virtual const char* className() {
return "DDS Image Reader";
}
virtual bool acceptsExtension(const std::string& extension) {
return osgDB::equalCaseInsensitive(extension,"dds");
}
virtual ReadResult readImage(const std::string& fileName, const osgDB::ReaderWriter::Options*) {
osg::Image* osgImage = ReadDDSFile(fileName.c_str());
if (osgImage==NULL) return ReadResult::FILE_NOT_HANDLED;
return osgImage;
}
};
// now register with Registry to instantiate the above
// reader/writer.
osgDB::RegisterReaderWriterProxy<ReaderWriterDDS> g_readerWriter_DDS_Proxy;