#853 Try to improve size of receiving buffer for glGetTexImage. #858
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1) Request maximum texture dimensions proeprly depending on texture type. 2) Cap total size by 1 GB on 32-bit and 4 GB on 64-bit. Note: in case of NVIDIA driver, GL_MAX_TEXTURE_SIZE = 32K, so 4 GB cap is always used anyway.
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Note: in case of NVIDIA driver, GL_MAX_TEXTURE_SIZE = 32K, so 4 GB cap is always used anyway.