7571cc1923
This adds three new feature flags COGL_FEATURE_TEXTURE_NPOT_BASIC, COGL_FEATURE_TEXTURE_NPOT_MIPMAP and COGL_FEATURE_TEXTURE_NPOT_REPEAT that can tell you if your hardware supports non power of two textures, npot textures + mipmaps and npot textures + wrap modes other than CLAMP_TO_EDGE. The pre-existing COGL_FEATURE_TEXTURE_NPOT feature implies all of the above. By default GLES 2 core supports npot textures but mipmaps and repeat modes can only be used with power of two textures. This patch also makes GLES check for the GL_OES_texture_npot extension to determine if mipmaps and repeating are supported with npot textures.