Implement support for floating point textures. Trac #12909 Implements GL_OES_texture_float, GL_OES_texture_half_float, GL_OES_texture_float_linear, and GL_OES_texture_half_float_linear when supported by the hardware. Signed-off-by: Nicolas Capens Signed-off-by: Daniel Koch Author: Shannon Woods <shannon.woods@transgaming.com> git-svn-id: https://angleproject.googlecode.com/svn/trunk@404 736b8ea6-26fd-11df-bfd4-992fa37f6226