// support for single-channel sRGB decoding, but it's not supported
// on GLES, and we're already actively rewriting single-channel inputs
// to GL_RED (even on desktop), so we stick to 3- and 4-channel inputs.
// support for single-channel sRGB decoding, but it's not supported
// on GLES, and we're already actively rewriting single-channel inputs
// to GL_RED (even on desktop), so we stick to 3- and 4-channel inputs.