[Mesa-dev] [PATCH 04/12] main/formats: Add layout and swizzle information
Jason Ekstrand
jason at jlekstrand.net
Fri Jul 18 18:16:05 PDT 2014
On Fri, Jul 18, 2014 at 2:10 PM, Marek Olšák <maraeo at gmail.com> wrote:
> On Thu, Jul 17, 2014 at 8:04 PM, Jason Ekstrand <jason at jlekstrand.net>
> wrote:
> > Signed-off-by: Jason Ekstrand <jason.ekstrand at intel.com>
> > ---
> > src/mesa/main/format_info.py | 11 +++++++++++
> > src/mesa/main/formats.c | 46
> ++++++++++++++++++++++++++++++++++++++++++++
> > src/mesa/main/formats.h | 29 ++++++++++++++++++++++++++++
> > 3 files changed, 86 insertions(+)
> >
> > diff --git a/src/mesa/main/format_info.py b/src/mesa/main/format_info.py
> > index b8956a5..448bd00 100644
> > --- a/src/mesa/main/format_info.py
> > +++ b/src/mesa/main/format_info.py
> > @@ -96,6 +96,14 @@ def get_gl_data_type(fmat):
> > else:
> > assert False
> >
> > +def get_mesa_layout(fmat):
> > + if fmat.layout == 'array':
> > + return 'MESA_FORMAT_LAYOUT_ARRAY'
> > + elif fmat.layout == 'packed':
> > + return 'MESA_FORMAT_LAYOUT_PACKED'
> > + else:
> > + return 'MESA_FORMAT_LAYOUT_OTHER'
> > +
> > def get_channel_bits(fmat, chan_name):
> > if fmat.is_compressed():
> > # These values are pretty-much bogus, but OpenGL requires that we
> > @@ -166,6 +174,7 @@ for fmat in formats:
> > print ' {'
> > print ' {0},'.format(fmat.name)
> > print ' "{0}",'.format(fmat.name)
> > + print ' {0},'.format(get_mesa_layout(fmat))
> > print ' {0},'.format(get_gl_base_format(fmat))
> > print ' {0},'.format(get_gl_data_type(fmat))
> >
> > @@ -176,6 +185,8 @@ for fmat in formats:
> >
> > print ' {0}, {1}, {2},'.format(fmat.block_width,
> fmat.block_height,
> > int(fmat.block_size() / 8))
> > +
> > + print ' {{ {0} }},'.format(', '.join(map(str, fmat.swizzle)))
> > print ' },'
> >
> > print '};'
> > diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
> > index 39cc5f1..f03425e 100644
> > --- a/src/mesa/main/formats.c
> > +++ b/src/mesa/main/formats.c
> > @@ -40,6 +40,8 @@ struct gl_format_info
> > /** text name for debugging */
> > const char *StrName;
> >
> > + enum mesa_format_layout Layout;
> > +
> > /**
> > * Base format is one of GL_RED, GL_RG, GL_RGB, GL_RGBA, GL_ALPHA,
> > * GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA,
> > @@ -67,6 +69,8 @@ struct gl_format_info
> > */
> > GLubyte BlockWidth, BlockHeight;
> > GLubyte BytesPerBlock;
> > +
> > + uint8_t Swizzle[4];
> > };
> >
> > #include "format_info.c"
> > @@ -178,6 +182,21 @@ _mesa_get_format_max_bits(mesa_format format)
> >
> >
> > /**
> > + * Return the layout type of the given format.
> > + * The return value will be one of:
> > + * MESA_FORMAT_LAYOUT_ARRAY
> > + * MESA_FORMAT_LAYOUT_PACKED
> > + * MESA_FORMAT_LAYOUT_OTHER
> > + */
> > +extern enum mesa_format_layout
> > +_mesa_get_format_layout(mesa_format format)
> > +{
> > + const struct gl_format_info *info = _mesa_get_format_info(format);
> > + return info->Layout;
> > +}
> > +
> > +
> > +/**
> > * Return the data type (or more specifically, the data representation)
> > * for the given format.
> > * The return value will be one of:
> > @@ -224,6 +243,33 @@ _mesa_get_format_block_size(mesa_format format,
> GLuint *bw, GLuint *bh)
> > }
> >
> >
> > +/**
> > + * Returns the an array of four numbers representing the transformation
> > + * from the RGBA or SZ colorspace to the given format. For array
> formats,
> > + * the i'th RGBA component is given by:
> > + *
> > + * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W)
> > + * comp = data[swizzle[i]];
> > + * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO)
> > + * comp = 0;
> > + * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE)
> > + * comp = 1;
> > + * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE)
> > + * // data does not contain a channel of this format
> > + *
> > + * For packed formats, the swizzle gives the number of components left
> of
> > + * the least significant bit.
> > + *
> > + * Compressed formats have no swizzle.
> > + */
> > +void
> > +_mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4])
> > +{
> > + const struct gl_format_info *info = _mesa_get_format_info(format);
> > + memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle));
> > +}
> > +
> > +
> > /** Is the given format a compressed format? */
> > GLboolean
> > _mesa_is_format_compressed(mesa_format format)
> > diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
> > index dc50bc8..48aad44 100644
> > --- a/src/mesa/main/formats.h
> > +++ b/src/mesa/main/formats.h
> > @@ -56,6 +56,15 @@ extern "C" {
> > */
> > #define MAX_PIXEL_BYTES 16
> >
> > +/**
> > + * Specifies the layout of a pixel format. See the MESA_FORMAT
> > + * documentation below.
> > + */
> > +enum mesa_format_layout {
> > + MESA_FORMAT_LAYOUT_ARRAY,
> > + MESA_FORMAT_LAYOUT_PACKED,
> > + MESA_FORMAT_LAYOUT_OTHER,
> > +};
> >
> > /**
> > * Mesa texture/renderbuffer image formats.
> > @@ -419,6 +428,9 @@ _mesa_get_format_bits(mesa_format format, GLenum
> pname);
> > extern GLuint
> > _mesa_get_format_max_bits(mesa_format format);
> >
> > +extern enum mesa_format_layout
> > +_mesa_get_format_layout(mesa_format format);
> > +
> > extern GLenum
> > _mesa_get_format_datatype(mesa_format format);
> >
> > @@ -428,6 +440,23 @@ _mesa_get_format_base_format(mesa_format format);
> > extern void
> > _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh);
> >
> > +/**
> > + * An enum representing different possible swizzling values. This is
> used
> > + * to interpret the output of _mesa_get_format_swizzle
> > + */
> > +enum {
> > + MESA_FORMAT_SWIZZLE_X = 0,
> > + MESA_FORMAT_SWIZZLE_Y = 1,
> > + MESA_FORMAT_SWIZZLE_Z = 2,
> > + MESA_FORMAT_SWIZZLE_W = 3,
> > + MESA_FORMAT_SWIZZLE_ZERO = 4,
> > + MESA_FORMAT_SWIZZLE_ONE = 5,
> > + MESA_FORMAT_SWIZZLE_NONE = 6,
> > +};
>
> It would be nicer to declare all enums at one place in the file (e.g.
> at the beginning) and not between function prototypes.
>
That's fair. I'll change that.
--Jason Ekstrand
>
> Marek
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/mesa-dev/attachments/20140718/ca811d3e/attachment.html>
More information about the mesa-dev
mailing list