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Added new osg::Texture::SubloadCallback, and getNumMipmapLevels() to osg::Texture

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and osg::Image.  This additions are design to make texture subloading more
flexible.
This commit is contained in:
Robert Osfield 2002-08-16 13:33:32 +00:00
parent bff72e1077
commit 7dfefaf67f
5 changed files with 138 additions and 75 deletions
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9
include/osg/Image
View File

@ -138,13 +138,14 @@ class SG_EXPORT Image : public Object
static const unsigned int computeNumComponents(GLenum format);
static const unsigned int computePixelSizeInBits(GLenum format,GLenum type);
static const unsigned int computeRowWidthInBytes(int width,GLenum format,GLenum type,int packing);
static const unsigned int computeNearestPowerOfTwo(unsigned int s,float bias=0.5f);
// precomputed mipmaps stuff;
typedef std::vector< unsigned int > MipmapDataType;
inline bool isMipmap() const {return !_mipmapData.empty();};
unsigned int getNumMipmaps() const
unsigned int getNumMipmapLevels() const
{
return _mipmapData.size()+1;
};
@ -160,11 +161,15 @@ class SG_EXPORT Image : public Object
{
if(mipmapNumber == 0)
return _data;
else if(mipmapNumber < getNumMipmaps())
else if(mipmapNumber < getNumMipmapLevels())
return _data + _mipmapData[mipmapNumber-1];
return 0L;
};
/** converts a single image into mip mapped version image.*/
void computeMipMaps();
protected :
virtual ~Image();

38
include/osg/Texture
View File

@ -215,14 +215,12 @@ class SG_EXPORT Texture : public StateAttribute
/** Get the internal format to use when creating OpenGL textures.*/
inline const int getInternalFormatValue() const { return _internalFormatValue; }
/** return the OpenGL texture object for specified context.*/
inline const uint getTextureObject(const uint contextID) const { if (contextID<_handleList.size()) return _handleList[contextID]; else return 0;}
enum SubloadMode {
OFF,
AUTO,
IF_DIRTY
IF_DIRTY,
USE_CALLBACK
};
/** Set the texture subload mode. */
@ -291,7 +289,8 @@ class SG_EXPORT Texture : public StateAttribute
}
/** Get the handle to the texture object for the current context.*/
inline GLuint& getHandle(const uint contextID) const
/** return the OpenGL texture object for specified context.*/
inline GLuint& getTextureObject(const uint contextID) const
{
// pad out handle list if required.
if (_handleList.size()<=contextID)
@ -322,6 +321,23 @@ class SG_EXPORT Texture : public StateAttribute
virtual void compile(State& state) const;
/** Get the number of mip map levels the the texture has been created with,*/
unsigned int getNumMipmapLevels() const { return _numMimpmapLevels; }
class SubloadCallback : public Referenced
{
public:
virtual void load(GLenum target, const Texture& texture,State& state) const;
virtual void subload(GLenum target, const Texture& texture,State& state) const;
};
void setSubloadCallback(SubloadCallback* cb) { _subloadCallback = cb; _subloadMode = cb ? USE_CALLBACK:OFF; }
SubloadCallback* getSubloadCallback() { return _subloadCallback.get(); }
const SubloadCallback* getSubloadCallback() const { return _subloadCallback.get(); }
@ -335,6 +351,10 @@ class SG_EXPORT Texture : public StateAttribute
* in the OpenGL context related to contextID.*/
static void flushDeletedTextureObjects(uint contextID);
/** Get the maximum texture size supported, this is the
normally define by GL_MAX_TEXTURE_SIZE, but can be overridden
by the OSG_MAX_TEXTURE_SIZE environmental variable.*/
static GLint getMaxTextureSize();
protected :
@ -378,24 +398,28 @@ class SG_EXPORT Texture : public StateAttribute
InternalFormatMode _internalFormatMode;
int _internalFormatValue;
mutable GLint _internalFormatValue;
Vec4 _borderColor;
// subloaded images can have different texture and image sizes.
mutable GLsizei _textureWidth, _textureHeight;
// number of mip map levels the the texture has been created with,
mutable unsigned int _numMimpmapLevels;
SubloadMode _subloadMode;
GLint _subloadTextureOffsetX, _subloadTextureOffsetY;
GLint _subloadImageOffsetX, _subloadImageOffsetY;
GLsizei _subloadImageWidth, _subloadImageHeight;
ref_ptr<SubloadCallback> _subloadCallback;
// static cache of deleted display lists which can only
// by completely deleted once the appropriate OpenGL context
// is set.
typedef std::map<uint,std::set<uint> > DeletedTextureObjectCache;
static DeletedTextureObjectCache s_deletedTextureObjectCache;
};
}

77
src/osg/Image.cpp
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@ -169,6 +169,21 @@ const unsigned int Image::computeRowWidthInBytes(int width,GLenum format,GLenum
return (widthInBits/packingInBits + ((widthInBits%packingInBits)?1:0))*packing;
}
const unsigned int Image::computeNearestPowerOfTwo(unsigned int s,float bias)
{
if ((s & (s-1))!=0)
{
// it isn't so lets find the closest power of two.
// yes, logf and powf are slow, but this code should
// only be called during scene graph initilization,
// if at all, so not critical in the greater scheme.
float p2 = logf((float)s)/logf(2.0f);
float rounded_p2 = floorf(p2+bias);
s = (int)(powf(2.0f,rounded_p2));
}
return s;
}
void Image::setInternalTextureFormat(GLint internalFormat)
{
// won't do any sanity checking right now, leave it to
@ -397,58 +412,10 @@ void Image::flipVertical(int image)
void Image::ensureValidSizeForTexturing()
{
int new_s = _s;
int new_t = _t;
int new_s = computeNearestPowerOfTwo(_s);
int new_t = computeNearestPowerOfTwo(_t);
// check if _s is a power of 2 already.
if ((_s & (_s-1))!=0)
{
// it isn't so lets find the closest power of two.
// yes, logf and powf are slow, but this code should
// only be called during scene graph initilization,
// if at all, so not critical in the greater scheme.
float p2 = logf((float)_s)/logf(2.0f);
float rounded_p2 = floorf(p2+0.5f);
new_s = (int)(powf(2.0f,rounded_p2));
}
if ((_t & (_t-1))!=0)
{
// it isn't so lets find the closest power of two.
// yes, logf and powf are slow, but this code should
// only be called during scene graph initilization,
// if at all, so not critical in the greater scheme.
float p2 = logf((float)_t)/logf(2.0f);
float rounded_p2 = floorf(p2+0.5f);
new_t = (int)(powf(2.0f,rounded_p2));
}
static GLint max_size=256;
static bool init = true;
if (init)
{
init = false;
glGetIntegerv(GL_MAX_TEXTURE_SIZE,&max_size);
notify(INFO) << "GL_MAX_TEXTURE_SIZE "<<max_size<<std::endl;
char *ptr;
if( (ptr = getenv("OSG_MAX_TEXTURE_SIZE")) != 0)
{
GLint osg_max_size = atoi(ptr);
notify(INFO) << "OSG_MAX_TEXTURE_SIZE "<<osg_max_size<<std::endl;
if (osg_max_size<max_size)
{
max_size = osg_max_size;
}
}
notify(INFO) << "Selected max texture size "<<max_size<<std::endl;
}
//max_size = 64;
static GLint max_size=Texture::getMaxTextureSize();
if (new_s>max_size) new_s = max_size;
if (new_t>max_size) new_t = max_size;
@ -462,6 +429,13 @@ void Image::ensureValidSizeForTexturing()
}
}
void Image::computeMipMaps()
{
}
///////////////////////////////////////////////////////////////////////////////
Geode* osg::createGeodeForImage(osg::Image* image)
{
@ -531,3 +505,4 @@ Geode* osg::createGeodeForImage(osg::Image* image,const float s,const float t)
return NULL;
}
}

72
src/osg/Texture.cpp
View File

@ -33,6 +33,7 @@ Texture::Texture():
_borderColor(0.0, 0.0, 0.0, 0.0),
_textureWidth(0),
_textureHeight(0),
_numMimpmapLevels(0),
_subloadMode(OFF),
_subloadTextureOffsetX(0),
_subloadTextureOffsetY(0),
@ -65,13 +66,15 @@ Texture::Texture(const Texture& text,const CopyOp& copyop):
_borderColor(text._borderColor),
_textureWidth(text._textureWidth),
_textureHeight(text._textureHeight),
_numMimpmapLevels(text._numMimpmapLevels),
_subloadMode(text._subloadMode),
_subloadTextureOffsetX(text._subloadTextureOffsetX),
_subloadTextureOffsetY(text._subloadTextureOffsetY),
_subloadImageOffsetX(text._subloadImageOffsetX),
_subloadImageOffsetY(text._subloadImageOffsetY),
_subloadImageWidth(text._subloadImageWidth),
_subloadImageHeight(text._subloadImageHeight)
_subloadImageHeight(text._subloadImageHeight),
_subloadCallback(text._subloadCallback)
{}
Texture::~Texture()
@ -223,7 +226,7 @@ void Texture::apply(State& state) const
const uint contextID = state.getContextID();
// get the globj for the current contextID.
GLuint& handle = getHandle(contextID);
GLuint& handle = getTextureObject(contextID);
if (handle != 0)
{
@ -254,6 +257,11 @@ void Texture::apply(State& state) const
// update the modified flag to show that the image has been loaded.
modifiedTag = _image->getModifiedTag();
}
else if (_subloadMode == USE_CALLBACK)
{
_subloadCallback->subload(_target,*this,state);
}
}
}
else if (_image.valid() && _image->data())
@ -455,6 +463,8 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
}
_internalFormatValue = internalFormat;
// an experiment to look at the changes in performance
// when use 16 bit textures rather than 24/32bit textures.
// internalFormat = GL_RGBA4;
@ -464,10 +474,12 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
(MyCompressedTexImage2DArbProc)getGLExtensionFuncPtr("glCompressedTexImage2DARB");
if (_subloadMode == OFF) {
if( _min_filter == LINEAR || _min_filter == NEAREST )
{
if ( !compressed )
{
_numMimpmapLevels = 1;
glTexImage2D( target, 0, internalFormat,
image->s(), image->t(), 0,
(GLenum)image->getPixelFormat(),
@ -477,6 +489,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
}
else if(glCompressedTexImage2D_ptr)
{
_numMimpmapLevels = 1;
GLint blockSize = ( internalFormat == GL_COMPRESSED_RGB_S3TC_DXT1_EXT ? 8 : 16 );
GLint size = ((image->s()+3)/4)*((image->t()+3)/4)*blockSize;
glCompressedTexImage2D_ptr(target, 0, internalFormat,
@ -491,6 +504,10 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
{
if(!image->isMipmap())
{
_numMimpmapLevels = 1;
gluBuild2DMipmaps( target, internalFormat,
image->s(),image->t(),
(GLenum)image->getPixelFormat(), (GLenum)image->getDataType(),
@ -499,13 +516,14 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
}
else
{
size_t no_mipmaps = image->getNumMipmaps();
_numMimpmapLevels = image->getNumMipmapLevels();
int width = image->s();
int height = image->t();
if( !compressed )
{
for( size_t k = 0 ; k < no_mipmaps && (width || height) ;k++)
for( size_t k = 0 ; k < _numMimpmapLevels && (width || height) ;k++)
{
if (width == 0)
@ -527,7 +545,7 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
{
GLint blockSize = ( internalFormat == GL_COMPRESSED_RGB_S3TC_DXT1_EXT ? 8 : 16 );
GLint size = 0;
for( size_t k = 0 ; k < no_mipmaps && (width || height) ;k++)
for( size_t k = 0 ; k < _numMimpmapLevels && (width || height) ;k++)
{
if (width == 0)
width = 1;
@ -549,13 +567,23 @@ void Texture::applyTexImage(GLenum target, Image* image, State& state) const
_textureWidth = image->s();
_textureHeight = image->t();
}
else if (_subloadMode == USE_CALLBACK)
{
_subloadCallback->load(target,*this,state);
}
else
{
static bool s_SGIS_GenMipmap = isGLExtensionSupported("GL_SGIS_generate_mipmap");
if (s_SGIS_GenMipmap && (_min_filter != LINEAR && _min_filter != NEAREST)) {
if (s_SGIS_GenMipmap && (_min_filter != LINEAR && _min_filter != NEAREST))
{
_numMimpmapLevels = 1; // will leave this at one, since the mipmap will be created internally by OpenGL.
glTexParameteri(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
}
else
{
_numMimpmapLevels = 1;
}
GLsizei width = (_subloadImageWidth>0)?_subloadImageWidth:image->s();
GLsizei height = (_subloadImageHeight>0)?_subloadImageHeight:image->t();
@ -631,7 +659,7 @@ void Texture::copyTexImage2D(State& state, int x, int y, int width, int height )
const uint contextID = state.getContextID();
// get the globj for the current contextID.
GLuint& handle = getHandle(contextID);
GLuint& handle = getTextureObject(contextID);
if (handle)
{
@ -687,7 +715,7 @@ void Texture::copyTexSubImage2D(State& state, int xoffset, int yoffset, int x, i
const uint contextID = state.getContextID();
// get the globj for the current contextID.
GLuint& handle = getHandle(contextID);
GLuint& handle = getTextureObject(contextID);
if (handle)
{
@ -711,3 +739,31 @@ void Texture::copyTexSubImage2D(State& state, int xoffset, int yoffset, int x, i
copyTexImage2D(state,x,y,width,height);
}
}
GLint Texture::getMaxTextureSize()
{
static GLint s_maxTextureSize = 0;
if (s_maxTextureSize == 0)
{
glGetIntegerv(GL_MAX_TEXTURE_SIZE,&s_maxTextureSize);
notify(INFO) << "GL_MAX_TEXTURE_SIZE "<<s_maxTextureSize<<std::endl;
char *ptr;
if( (ptr = getenv("OSG_MAX_TEXTURE_SIZE")) != 0)
{
GLint osg_max_size = atoi(ptr);
notify(INFO) << "OSG_MAX_TEXTURE_SIZE "<<osg_max_size<<std::endl;
if (osg_max_size<s_maxTextureSize)
{
s_maxTextureSize = osg_max_size;
}
}
notify(INFO) << "Selected max texture size "<<s_maxTextureSize<<std::endl;
}
return s_maxTextureSize;
}

9
src/osg/TextureCubeMap.cpp
View File

@ -179,7 +179,7 @@ void TextureCubeMap::apply(State& state) const
const uint contextID = state.getContextID();
// get the globj for the current contextID.
GLuint& handle = getHandle(contextID);
GLuint& handle = getTextureObject(contextID);
if (handle != 0)
{
@ -196,8 +196,7 @@ void TextureCubeMap::apply(State& state) const
glBindTexture( _target, handle );
if (_texParamtersDirty) applyTexParameters(_target,state);
unsigned int rowwidth = 0;
int rowwidth = 0;
for (int n=0; n<6; n++)
{
if ((_subloadMode == AUTO) ||
@ -218,6 +217,10 @@ void TextureCubeMap::apply(State& state) const
// update the modified flag to show that the image has been loaded.
modifiedTag += _images[n]->getModifiedTag();
}
else if (_subloadMode == USE_CALLBACK)
{
_subloadCallback->subload(faceTarget[n],*this,state);
}
}
glPixelStorei(GL_UNPACK_ROW_LENGTH,0);
}