Bug 19126833 Added Texture3D argument verifications. Added the basic API and functions. A few are still unimplemented: - Image::loadCompressedData() (for depth other than 1) - Texture3D::copyImage() - Texture3D::generateMipmaps() Added colour grading test for 3D texture Change-Id: I9e52afa7213999f94c5916c2f301fc6fa4b42c0d Reviewed-on: https://swiftshader-review.googlesource.com/1730Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com>
