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| author | Iago Toral Quiroga <itoral@igalia.com> | 2014-10-29 13:32:43 +0100 |
|---|---|---|
| committer | Iago Toral Quiroga <itoral@igalia.com> | 2015-01-12 11:20:29 +0100 |
| commit | d71a1adff253aa75a3474723209c35831bb3f048 (patch) | |
| tree | c76d0ebf4fbe34b10a6ada644dad7b67beb505ad /src/mesa/main/pack.h | |
| parent | a177b30f1f2a74c14a649e9990eaab8826523c69 (diff) | |
| download | external_mesa3d-d71a1adff253aa75a3474723209c35831bb3f048.zip external_mesa3d-d71a1adff253aa75a3474723209c35831bb3f048.tar.gz external_mesa3d-d71a1adff253aa75a3474723209c35831bb3f048.tar.bz2 | |
mesa: Add RGBA to Luminance conversion helpers
For glReadPixels with a Luminance destination format we compute luminance
values from RGBA as L=R+G+B. This, however, requires ad-hoc implementation,
since pack/unpack functions or _mesa_swizzle_and_convert won't do this
(and thus, neither will _mesa_format_convert). This patch adds helpers
to do this computation so they can be used to support conversion to luminance
formats.
The current implementation of glReadPixels does this computation as part
of the span functions in pack.c (see _mesa_pack_rgba_span_float), that do
this together with other things like type conversion, etc. We do not want
to use these functions but use _mesa_format_convert instead (later patches
will remove the color span functions), so we need to extract this functionality
as helpers.
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Diffstat (limited to 'src/mesa/main/pack.h')
| -rw-r--r-- | src/mesa/main/pack.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mesa/main/pack.h b/src/mesa/main/pack.h index 2173b65..9988bea 100644 --- a/src/mesa/main/pack.h +++ b/src/mesa/main/pack.h @@ -155,4 +155,14 @@ _mesa_rebase_rgba_float(GLuint n, GLfloat rgba[][4], GLenum baseFormat); extern void _mesa_rebase_rgba_uint(GLuint n, GLuint rgba[][4], GLenum baseFormat); +extern void +_mesa_pack_luminance_from_rgba_float(GLuint n, GLfloat rgba[][4], + GLvoid *dstAddr, GLenum dst_format, + GLbitfield transferOps); + +extern void +_mesa_pack_luminance_from_rgba_integer(GLuint n, GLuint rgba[][4], bool rgba_is_signed, + GLvoid *dstAddr, GLenum dst_format, + GLenum dst_type); + #endif |