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Opengl glTexImage3D memory issues

Question asked by bbalazs on Nov 25, 2015
Latest reply on Nov 26, 2015 by pinform



i have a strange issue with memory usage of glTexImage3D with JOGL on AMD cards.
I check memory usage with GPU-Z, Process Explorer and AMD CodeXL.
I load a 512x512x512 short texture.
And the result :

AMD CodeXL : 256 MB (here i can check extact value

GPU-Z and Process Explore : ~400 MB (here i can only check the increasing memory usage)



ShortBuffer data = ShortBuffer.wrap(stack.getData(0));
            gl.glBindTexture(GL2.GL_TEXTURE_3D, volumeTextureLevelIDs[0]);           

            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_MAX_LEVEL, 0);
            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_BASE_LEVEL, 0);


            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_WRAP_S, GL2.GL_CLAMP_TO_EDGE);
            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_WRAP_T, GL2.GL_CLAMP_TO_EDGE);
            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_WRAP_R, GL2.GL_CLAMP_TO_EDGE);


            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_LINEAR);
            gl.glTexParameteri(GL2.GL_TEXTURE_3D, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_LINEAR);

            gl.glTexImage3D(GL2.GL_TEXTURE_3D, 0, GL2.GL_R16_SNORM, w, h, d, 0, GL2.GL_RED, GL2.GL_SHORT, data.rewind());

            gl.glBindTexture(GL2.GL_TEXTURE_3D, 0);

What is the real value of memory usage?