From Farshid Lashkari, support for non power of two extension.

include/osg/Texture

@@ -294,6 +294,15 @@ class OSG_EXPORT Texture : public osg::StateAttribute
         /** Gets whether to use client storage for the texture. */
         inline bool getClientStorageHint() const { return _clientStorageHint; }
 
+        /** Sets whether to force the texture to resize images that have dimensions 
+          * that are not a power of two. If enabled, NPOT images will be resized,
+          * whether or not NPOT textures are supported by the hardware. If disabled,
+          * NPOT images will not be resized if supported by hardware. */
+        inline void setResizeNonPowerOfTwoHint(bool flag) { _resizeNonPowerOfTwoHint = flag; }
+
+        /** Gets whether texture will force non power to two images to be resized. */
+        inline bool getResizeNonPowerOfTwoHint() const { return _resizeNonPowerOfTwoHint; }
+
         enum InternalFormatMode {
             USE_IMAGE_DATA_FORMAT,
             USE_USER_DEFINED_FORMAT,
@@ -556,6 +565,7 @@ class OSG_EXPORT Texture : public osg::StateAttribute
         bool            _useHardwareMipMapGeneration;
         bool            _unrefImageDataAfterApply;
         bool            _clientStorageHint;
+        bool            _resizeNonPowerOfTwoHint;
 
         Vec4            _borderColor;
         GLint           _borderWidth;

src/osg/Texture.cpp

@@ -337,6 +337,7 @@ Texture::Texture():
             _useHardwareMipMapGeneration(true),
             _unrefImageDataAfterApply(false),
             _clientStorageHint(false),
+            _resizeNonPowerOfTwoHint(false),
             _borderColor(0.0, 0.0, 0.0, 0.0),
             _borderWidth(0),
             _internalFormatMode(USE_IMAGE_DATA_FORMAT),
@@ -359,6 +360,7 @@ Texture::Texture(const Texture& text,const CopyOp& copyop):
             _useHardwareMipMapGeneration(text._useHardwareMipMapGeneration),
             _unrefImageDataAfterApply(text._unrefImageDataAfterApply),
             _clientStorageHint(text._clientStorageHint),
+            _resizeNonPowerOfTwoHint(text._resizeNonPowerOfTwoHint),
             _borderColor(text._borderColor),
             _borderWidth(text._borderWidth),
             _internalFormatMode(text._internalFormatMode),
@@ -400,6 +402,7 @@ int Texture::compareTexture(const Texture& rhs) const
 
     COMPARE_StateAttribute_Parameter(_unrefImageDataAfterApply)
     COMPARE_StateAttribute_Parameter(_clientStorageHint)
+    COMPARE_StateAttribute_Parameter(_resizeNonPowerOfTwoHint)
 
     return 0;
 }
@@ -708,8 +711,18 @@ void Texture::computeRequiredTextureDimensions(State& state, const osg::Image& i
     const unsigned int contextID = state.getContextID();
     const Extensions* extensions = getExtensions(contextID,true);
 
-    int width = Image::computeNearestPowerOfTwo(image.s()-2*_borderWidth)+2*_borderWidth;
+    int width,height;
-    int height = Image::computeNearestPowerOfTwo(image.t()-2*_borderWidth)+2*_borderWidth;
+
+    if( !_resizeNonPowerOfTwoHint && extensions->isNonPowerOfTwoTextureSupported() )
+    {
+        width = image.s();
+        height = image.t();
+    }
+    else
+    {
+        width = Image::computeNearestPowerOfTwo(image.s()-2*_borderWidth)+2*_borderWidth;
+        height = Image::computeNearestPowerOfTwo(image.t()-2*_borderWidth)+2*_borderWidth;
+    }
 
     // cap the size to what the graphics hardware can handle.
     if (width>extensions->maxTextureSize()) width = extensions->maxTextureSize();

src/osg/Texture1D.cpp

@@ -188,6 +188,8 @@ void Texture1D::applyTexImage1D(GLenum target, Image* image, State& state, GLsiz
     // select the internalFormat required for the texture.
     bool compressed = isCompressedInternalFormat(_internalFormat);
     
+    //Rescale if resize hint is set or NPOT not supported or dimension exceeds max size
+    if( _resizeNonPowerOfTwoHint || !extensions->isNonPowerOfTwoTextureSupported() || inwidth > extensions->maxTextureSize() )
         image->ensureValidSizeForTexturing(extensions->maxTextureSize());
 
     glPixelStorei(GL_UNPACK_ALIGNMENT,image->getPacking());

src/osg/Texture3D.cpp

@@ -97,10 +97,22 @@ void Texture3D::computeRequiredTextureDimensions(State& state, const osg::Image&
 {
     const unsigned int contextID = state.getContextID();
     const Extensions* extensions = getExtensions(contextID,true);
+    const Texture::Extensions* texExtensions = Texture::getExtensions(contextID,true);
 
-    int width = Image::computeNearestPowerOfTwo(image.s()-2*_borderWidth)+2*_borderWidth;
+    int width,height,depth;
-    int height = Image::computeNearestPowerOfTwo(image.t()-2*_borderWidth)+2*_borderWidth;
+
-    int depth = Image::computeNearestPowerOfTwo(image.r()-2*_borderWidth)+2*_borderWidth;
+    if( !_resizeNonPowerOfTwoHint && texExtensions->isNonPowerOfTwoTextureSupported() )
+    {
+        width = image.s();
+        height = image.t();
+        depth = image.r();
+    }
+    else
+    {
+        width = Image::computeNearestPowerOfTwo(image.s()-2*_borderWidth)+2*_borderWidth;
+        height = Image::computeNearestPowerOfTwo(image.t()-2*_borderWidth)+2*_borderWidth;
+        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();
@@ -250,6 +262,7 @@ void Texture3D::applyTexImage3D(GLenum target, Image* image, State& state, GLsiz
     // current OpenGL context.
     const unsigned int contextID = state.getContextID();
     const Extensions* extensions = getExtensions(contextID,true);    
+    const Texture::Extensions* texExtensions = Texture::getExtensions(contextID,true);
 
     // compute the internal texture format, this set the _internalFormat to an appropriate value.
     computeInternalFormat();
@@ -264,6 +277,11 @@ void Texture3D::applyTexImage3D(GLenum target, Image* image, State& state, GLsiz
         //return;
     }    
     
+    //Rescale if resize hint is set or NPOT not supported or dimensions exceed max size
+    if( _resizeNonPowerOfTwoHint || !texExtensions->isNonPowerOfTwoTextureSupported()
+        || inwidth > extensions->maxTexture3DSize()
+        || inheight > extensions->maxTexture3DSize()
+        || indepth > extensions->maxTexture3DSize() )
         image->ensureValidSizeForTexturing(extensions->maxTexture3DSize());
 
     glPixelStorei(GL_UNPACK_ALIGNMENT,image->getPacking());

src/osg/TextureCubeMap.cpp

@@ -258,6 +258,12 @@ void TextureCubeMap::apply(State& state) const
         // compute the dimensions of the texture.
         computeRequiredTextureDimensions(state,*_images[0],_textureWidth, _textureHeight, _numMipmapLevels);
 
+        // cubemap textures must have square dimensions
+        if( _textureWidth != _textureHeight )
+        {
+            _textureWidth = _textureHeight = minimum( _textureWidth , _textureHeight );
+        }
+
         _textureObjectBuffer[contextID] = textureObject = generateTextureObject(
                 contextID,GL_TEXTURE_CUBE_MAP,_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,1,0);