Function WipeStateCache

src/SFGUI/Canvas.cpp:179–217

}

void WipeStateCache( sf::RenderTarget& target ) {
	// Make SFML disable it's **************** vertex cache without us
	// having to call ResetGLStates() and disturbing OpenGL needlessly.
	// This would be sooo much easier if we could somehow set
	// myCache.UseVertexCache = false;
	// in window by ourself every frame.
	// SFML doesn't like to play nice with other VBO / Vertex Array
	// users, that's for sure... It assumes that the array pointers
	// don't get changed between calls to Draw() unless ResetGLStates()
	// is explicitly called in between. Why do we need to call OpenGL
	// 10+ times just to reset something this simple? No logic.

	//static sf::VertexArray resetter_array( sf::TrianglesStrip, 5 );
	//window.Draw( resetter_array );

	// Or... even more evil... use memset to blank the StatesCache of
	// the RenderWindow with zeros. Thankfully, because we are using
	// the data structures directly from the SFML headers, if Laurent
	// decides to change their size one day we won't even notice.
	struct StatesCache {
		bool glStatesSet;
		bool ViewChanged;
		sf::BlendMode LastBlendMode;
		std::uint64_t LastTextureId;
		bool UseVertexCache;
		sf::Vertex VertexCache[4];
	};

	// All your cache are belong to us.
	memset( reinterpret_cast<char*>( &target ) + sizeof( sf::RenderTarget ) - sizeof( StatesCache ) + 1, 0, sizeof( StatesCache ) - 1 );

	// This is to make it forget it's cached viewport.
	// Seriously... caching the viewport? Come on...
	memset( reinterpret_cast<char*>( &target ) + sizeof( sf::RenderTarget ) - sizeof( StatesCache ) + 1, 1, 1 );

	// Since we wiped SFML's cache of its bound texture, we
	// should make sure that it stays coherent with reality :).
	sf::Texture::bind( 0 );
}

}