From 13d96866ca5d0e2be51f20a72da9e0f7032a16ea Mon Sep 17 00:00:00 2001 From: marha Date: Tue, 25 Mar 2014 17:54:52 +0100 Subject: mesa git update 25 Marc 2014 mesa commit b995a010e688bc4d4557e973e5e28091c378e881 --- mesalib/src/mesa/main/formats.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'mesalib/src/mesa/main/formats.c') diff --git a/mesalib/src/mesa/main/formats.c b/mesalib/src/mesa/main/formats.c index e74625f23..fb2501c69 100644 --- a/mesalib/src/mesa/main/formats.c +++ b/mesalib/src/mesa/main/formats.c @@ -2206,6 +2206,35 @@ _mesa_format_num_components(mesa_format format) } +/** + * Returns true if a color format has data stored in the R/G/B/A channels, + * given an index from 0 to 3. + */ +bool +_mesa_format_has_color_component(mesa_format format, int component) +{ + const struct gl_format_info *info = _mesa_get_format_info(format); + + assert(info->BaseFormat != GL_DEPTH_COMPONENT && + info->BaseFormat != GL_DEPTH_STENCIL && + info->BaseFormat != GL_STENCIL_INDEX); + + switch (component) { + case 0: + return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0; + case 1: + return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0; + case 2: + return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0; + case 3: + return (info->AlphaBits + info->IntensityBits) > 0; + default: + assert(!"Invalid color component: must be 0..3"); + return false; + } +} + + /** * Return number of bytes needed to store an image of the given size * in the given format. -- cgit v1.2.3