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author | marha <marha@users.sourceforge.net> | 2014-03-25 17:58:27 +0100 |
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committer | marha <marha@users.sourceforge.net> | 2014-03-25 17:58:27 +0100 |
commit | cd9a6bd6dd3acdebd091fabbe9382e0831362ab1 (patch) | |
tree | 48bea27f46ecfe20e0cc342752d7bec5b81d402c /mesalib/src/mesa/main/formats.c | |
parent | ba6115f56f066621a20fa545ddd67721afd35523 (diff) | |
parent | 13d96866ca5d0e2be51f20a72da9e0f7032a16ea (diff) | |
download | vcxsrv-cd9a6bd6dd3acdebd091fabbe9382e0831362ab1.tar.gz vcxsrv-cd9a6bd6dd3acdebd091fabbe9382e0831362ab1.tar.bz2 vcxsrv-cd9a6bd6dd3acdebd091fabbe9382e0831362ab1.zip |
Merge remote-tracking branch 'origin/released'
Diffstat (limited to 'mesalib/src/mesa/main/formats.c')
-rw-r--r-- | mesalib/src/mesa/main/formats.c | 29 |
1 files changed, 29 insertions, 0 deletions
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 @@ -2207,6 +2207,35 @@ _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. */ |