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rendering the clipmaps

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im trying to make a function that will render the clipmaps (rings) described in geoemtry clipmaps... i want to create a function which renders these rings based on their level and a first level size... but for some reason i cant get it to fit togheter...
int blocksize = (255+1.0f)/4; // 255 = default clipmap size

void CTERRAIN::RenderLevel(float x, float z, int level)
{
        int scale = pow(2, level);
	
	RenderBlock((x+blocksize+2*scale)	, (z+blocksize+2*scale), scale);
	RenderBlock((x+blocksize+2*scale)	, (z+2*scale),			scale);
	RenderBlock((x+2*scale)				, (z+blocksize+2*scale), scale);

	RenderBlock(-(x+2*blocksize+scale)	, (z+blocksize+scale), scale);
	RenderBlock(-(x+2*blocksize+scale)	, (z+scale),			scale);
	RenderBlock(-(x+blocksize+scale)		, (z+blocksize+2*scale), scale);

	RenderBlock(-(x+2*blocksize+scale)	, -(z+2*blocksize+scale), scale);
	RenderBlock(-(x+2*blocksize+scale)	, -(z+blocksize+scale),			scale);
	RenderBlock(-(x+blocksize+scale)	, -(z+2*blocksize+scale), scale);	

	RenderBlock((x+blocksize+scale)		, -(z+2*blocksize+scale), scale);
	RenderBlock((x+blocksize+2*scale)	, -(z+blocksize+scale),			scale);
	RenderBlock((x+scale)				, -(z+2*blocksize+scale), scale);	
}

void CTERRAIN::RenderBlock(float x, float z, float scale)
{
		ShaderProgram->sendUniform("ScaleFactor", scale, scale, x, z);
		glDrawElements(GL_TRIANGLE_STRIP, NumberOfElements, GL_UNSIGNED_INT, 0);
}


the rednerblock function renders a block where the x,z coordinates is the lowerleft part of each block and scaled after the parameter scale... ive not included the fixup blocks because they are not important here... they are jsut empty space..

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