FGFS-4.1/simgear
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Mipmapping requires a power-of-two destination buffer even if the source isn't. Neglecting this causes a massive bufferoverflow of the destination buffer. So for now we do not mipmap non-power-of-two textures and throw a warning. This affects at least the PC-9M and F-16, presumable many others. The effect will be a black texture when zoomed out and the proper texture when zooming in close enough.

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This commit is contained in:
Erik Hofman 2020-08-29 14:45:47 +02:00 committed by Automatic Release Builder
parent 61dc19f635
commit e28c4fa5ca
1 changed files with 15 additions and 11 deletions
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26
simgear/scene/material/mipmap.cxx
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@ -82,13 +82,13 @@ void _writeColor(GLenum pixelFormat, T* data, float scale, osg::Vec4 value)
switch(pixelFormat)
{
case(GL_DEPTH_COMPONENT): //intentionally fall through and execute the code for GL_LUMINANCE
case(GL_LUMINANCE): { *data++ = value.r()*scale; break; }
case(GL_ALPHA): { *data++ = value.a()*scale; break; }
case(GL_LUMINANCE_ALPHA): { *data++ = value.r()*scale; *data++ = value.a()*scale; break; }
case(GL_RGB): { *data++ = value.r()*scale; *data++ = value.g()*scale; *data++ = value.b()*scale; break; }
case(GL_RGBA): { *data++ = value.r()*scale; *data++ = value.g()*scale; *data++ = value.b()*scale; *data++ = value.a()*scale; break; }
case(GL_BGR): { *data++ = value.b()*scale; *data++ = value.g()*scale; *data++ = value.r()*scale; break; }
case(GL_BGRA): { *data++ = value.b()*scale; *data++ = value.g()*scale; *data++ = value.r()*scale; *data++ = value.a()*scale; break; }
case(GL_LUMINANCE): { *data = value.r()*scale; break; }
case(GL_ALPHA): { *data = value.a()*scale; break; }
case(GL_LUMINANCE_ALPHA): { *data++ = value.r()*scale; *data = value.a()*scale; break; }
case(GL_RGB): { *data++ = value.r()*scale; *data++ = value.g()*scale; *data = value.b()*scale; break; }
case(GL_RGBA): { *data++ = value.r()*scale; *data++ = value.g()*scale; *data++ = value.b()*scale; *data = value.a()*scale; break; }
case(GL_BGR): { *data++ = value.b()*scale; *data++ = value.g()*scale; *data = value.r()*scale; break; }
case(GL_BGRA): { *data++ = value.b()*scale; *data++ = value.g()*scale; *data++ = value.r()*scale; *data = value.a()*scale; break; }
}
}
@ -265,7 +265,13 @@ osg::Image* computeMipmap( osg::Image* image, MipMapTuple attrs )
{
bool computeMipmap = false;
unsigned int nbComponents = osg::Image::computeNumComponents( image->getPixelFormat() );
if ( std::get<0>(attrs) != AUTOMATIC &&
int s = image->s();
int t = image->t();
if ( (s & (s - 1)) || (t & (t - 1)) ) // power of two test
{
SG_LOG(SG_IO, SG_DEV_ALERT, "mipmapping: texture size not a power-of-two: " + image->getFileName());
}
else if ( std::get<0>(attrs) != AUTOMATIC &&
( std::get<1>(attrs) != AUTOMATIC || nbComponents < 2 ) &&
( std::get<2>(attrs) != AUTOMATIC || nbComponents < 3 ) &&
( std::get<3>(attrs) != AUTOMATIC || nbComponents < 4 ) )
@ -283,9 +289,7 @@ osg::Image* computeMipmap( osg::Image* image, MipMapTuple attrs )
if ( computeMipmap )
{
osg::ref_ptr<osg::Image> mipmaps = new osg::Image();
int s = image->s(),
t = image->t(),
r = image->r();
int r = image->r();
int nb = osg::Image::computeNumberOfMipmapLevels(s, t, r);
osg::Image::MipmapDataType mipmapOffsets;
unsigned int offset = 0;