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OpenGL opengl Histogram

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Hi folks, I'm trying to compute the histogram in a off-screen rendering to a texture. I'm just doing the simpliest sample, a white square in a black screen. The problem is that the texture is created and works fine but when I compute the histogram it has no sense, and it shows me different results each time. Once I have the texture I use the following code: glEnable(GL_HISTOGRAM); glEnable(GL_TEXTURE_2D); glHistogram(GL_HISTOGRAM, HISTOGRAM_SIZE, GL_RGB, GL_TRUE); glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, mypbuffer.width, mypbuffer.height); glGetHistogram(GL_HISTOGRAM, GL_FALSE, GL_RGB, GL_UNSIGNED_INT, histoGram); glResetHistogram(GL_HISTOGRAM); glDisable(GL_TEXTURE_2D); glDisable(GL_HISTOGRAM); Any idea? Thanks in advance.

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