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Tegra 4 Extensions

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I am ashamed to ask such question, but I am lost in search. I am creating an Tegra 4 application that is in need of render target with pixel format that will store, for instance, logarithmic luminance, something like R16_float. AFAIK Tegra 4 supports such formats, but they are not available in standard OpenGL ES 2.0, only through extensions. How do I create such texture with GLES20.glTexImage2D? I know how to use glTexImage2D, but I have no idea how to include those extensions in Java (I am not using NDK).


I would appreciate any help, all I could find on the net was how to get supported extensions as a string, not how to use them.

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