FGFS-4.1/OpenSceneGraph
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Added proper handling of 3d texture compression

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This commit is contained in:
Robert Osfield
2004-09-30 09:10:29 +00:00
parent a8739f952a
commit d204a087c3
6 changed files with 139 additions and 32 deletions
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89
src/osg/Texture3D.cpp
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@@ -93,6 +93,53 @@ void Texture3D::setImage(Image* image)
_image = image;
}
void Texture3D::computeRequiredTextureDimensions(State& state, const osg::Image& image,GLsizei& inwidth, GLsizei& inheight,GLsizei& indepth, GLsizei& numMipmapLevels) const
{
const unsigned int contextID = state.getContextID();
const Extensions* extensions = getExtensions(contextID,true);
int width = Image::computeNearestPowerOfTwo(image.s()-2*_borderWidth)+2*_borderWidth;
int height = Image::computeNearestPowerOfTwo(image.t()-2*_borderWidth)+2*_borderWidth;
int depth = Image::computeNearestPowerOfTwo(image.r()-2*_borderWidth)+2*_borderWidth;
// cap the size to what the graphics hardware can handle.
if (width>extensions->maxTexture3DSize()) width = extensions->maxTexture3DSize();
if (height>extensions->maxTexture3DSize()) height = extensions->maxTexture3DSize();
if (depth>extensions->maxTexture3DSize()) depth = extensions->maxTexture3DSize();
inwidth = width;
inheight = height;
indepth = depth;
bool useHardwareMipMapGeneration = false; //!image.isMipmap() && _useHardwareMipMapGeneration && extensions->isGenerateMipMapSupported();
if( _min_filter == LINEAR || _min_filter == NEAREST || useHardwareMipMapGeneration )
{
numMipmapLevels = 1;
}
else if( image.isMipmap() )
{
numMipmapLevels = image.getNumMipmapLevels();
}
else
{
numMipmapLevels = 0;
for( ; (width || height || depth) ;++numMipmapLevels)
{
if (width == 0)
width = 1;
if (height == 0)
height = 1;
if (depth == 0)
depth = 1;
width >>= 1;
height >>= 1;
depth >>= 1;
}
}
}
void Texture3D::apply(State& state) const
{
@@ -155,10 +202,17 @@ void Texture3D::apply(State& state) const
else if (_image.valid() && _image->data())
{
// compute the internal texture format, this set the _internalFormat to an appropriate value.
computeInternalFormat();
// compute the dimensions of the texture.
computeRequiredTextureDimensions(state,*_image,_textureWidth, _textureHeight, _textureDepth,_numMipmapLevels);
_textureObjectBuffer[contextID] = textureObject = generateTextureObject(contextID,GL_TEXTURE_3D);
textureObject->bind();
applyTexParameters(GL_TEXTURE_3D,state);
applyTexImage3D(GL_TEXTURE_3D,_image.get(),state, _textureWidth, _textureHeight, _textureDepth,_numMipmapLevels);
@@ -195,7 +249,6 @@ void Texture3D::applyTexImage3D(GLenum target, Image* image, State& state, GLsiz
// get the contextID (user defined ID of 0 upwards) for the
// current OpenGL context.
const unsigned int contextID = state.getContextID();
const Extensions* extensions = getExtensions(contextID,true);
// compute the internal texture format, this set the _internalFormat to an appropriate value.
@@ -203,6 +256,8 @@ void Texture3D::applyTexImage3D(GLenum target, Image* image, State& state, GLsiz
// select the internalFormat required for the texture.
bool compressed = isCompressedInternalFormat(_internalFormat);
bool compressed_image = isCompressedInternalFormat((GLenum)image->getPixelFormat());
if (compressed)
{
//notify(WARN)<<"Warning::cannot currently use compressed format with 3D textures."<<std::endl;
@@ -216,11 +271,33 @@ void Texture3D::applyTexImage3D(GLenum target, Image* image, State& state, GLsiz
if( _min_filter == LINEAR || _min_filter == NEAREST )
{
numMipmapLevels = 1;
extensions->glTexImage3D( target, 0, _internalFormat,
image->s(), image->t(), image->r(), _borderWidth,
(GLenum)image->getPixelFormat(),
(GLenum)image->getDataType(),
image->data() );
if (!compressed_image)
{
// notify(WARN)<<"glTexImage3D"<<std::endl;
extensions->glTexImage3D( target, 0, _internalFormat,
inwidth, inheight, indepth,
_borderWidth,
(GLenum)image->getPixelFormat(),
(GLenum)image->getDataType(),
image->data() );
}
else if (extensions->isCompressedTexImage3DSupported())
{
// notify(WARN)<<"glCompressedTexImage3D "<<inwidth<<", "<<inheight<<", "<<indepth<<std::endl;
numMipmapLevels = 1;
GLint blockSize, size;
getCompressedSize(_internalFormat, inwidth, inheight, indepth, blockSize,size);
extensions->glCompressedTexImage3D(target, 0, _internalFormat,
inwidth, inheight, indepth,
_borderWidth,
size,
image->data());
}
}
else
{