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Fix automatic mipmap generation for Canvas textures

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When using glTexStorage2D, OSG doesn't allocate storage for the levels
of the mipmap above the base unless an image is assigned to the
texture.
This commit is contained in:
Tim Moore 2019-04-04 11:47:55 +00:00
parent 5fdf6ef4f3
commit 325b89e023
1 changed files with 8 additions and 2 deletions
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10
simgear/canvas/ODGauge.cxx
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@ -250,10 +250,16 @@ namespace canvas
if( !texture )
{
// It shouldn't be necessary to allocate an image for the
// texture that is the target of dynamic rendering, but
// otherwise OSG won't construct all the mipmaps for the texture
// and dynamic mipmap generation doesn't work.
osg::Image* image = new osg::Image;
image->allocateImage(_size_x, _size_y, 1, GL_RGBA, GL_UNSIGNED_BYTE);
texture = new osg::Texture2D;
texture->setResizeNonPowerOfTwoHint(false);
texture->setTextureSize(_size_x, _size_y);
texture->setInternalFormat(GL_RGBA);
texture->setImage(image);
texture->setUnRefImageDataAfterApply(true);
}
updateSampling();