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v2: s/unsigned int/unsigned/ in prog_optimize.c
Signed-off-by: Jan Vesely <[email protected]>
Reviewed-by: David Heidelberg <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>
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When converting to a format that has fewer bits the previous code was just
shifting off the bits. This doesn't provide very accurate results. For example
when converting from 8 bits to 5 bits it is equivalent to doing this:
x * 32 / 256
This works as if it's taking a value from a range where 256 represents 1.0 and
scaling it down to a range where 32 represents 1.0. However this is not
correct because it is actually 255 and 31 that represent 1.0.
We can do better with a formula like this:
(x * 31 + 127) / 255
The +127 is to make it round correctly.
The new code has a special case to use uint64_t when the result of the
multiplication would overflow an unsigned int. This function is inline and
only ever called with constant values so hopefully the if statements will be
folded.
The main incentive to do this is to make the CPU conversion path pick the same
values as the hardware would if it did the conversion. This fixes failures
with the ‘texsubimage pbo’ test when using the patches from here:
http://lists.freedesktop.org/archives/mesa-dev/2015-January/074312.html
v2: Use 64-bit arithmetic when src_bits+dst_bits > 32
Reviewed-by: Jason Ekstrand <[email protected]>
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The 8888 suggests 8-bit components which is not correct, so
replace that with the actual size of the components in each
format.
Reviewed-by: Jason Ekstrand <[email protected]>
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In the future we would like to have a format conversion library that is
independent of GL so we can share it with Gallium. This is a step in that
direction.
Reviewed-by: Jason Ekstrand <[email protected]>
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This will come in handy when callers of _mesa_format_convert need
to compute the rebase swizzle parameter to use.
Reviewed-by: Jason Ekstrand <[email protected]>
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The new parameter allows callers to provide a rebase swizzle that
the function needs to use to match the requirements of the base
internal format involved. This is necessary when the source or
destination internal formats (depending on whether we are doing
the conversion for a pixel download or a pixel upload respectively)
do not match the base formats of the source or destination
formats of the conversion. This can happen when the driver does not
support the internal formats and uses a different format to store
pixel data internally.
For example, a texture upload from RGB to Luminance in a driver
that does not support textures with a Luminance format may decide
to store the Luminance data as RGBA. In this case we want to store
the RGBA values as (R,R,R,1). Following the same example, when we
download from that texture to RGBA we want to read (R,0,0,1). The
rebase_swizzle parameter allows these transforms to happen.
Reviewed-by: Jason Ekstrand <[email protected]>
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v2 by Iago Toral <[email protected]>:
- When testing if we can directly pack we should use the src format to check
if we are packing from an RGBA format. The original code used the dst format
for the ubyte case by mistake.
- Fixed incorrect number of bits for dst, it was computed using the src format
instead of the dst format.
- If the dst format is an array format, check if it is signed. We were only
checking this for the case where it was not an array format, but we need
to know this in both scenarios.
- Fixed incorrect swizzle transform for the cases where we convert between
array formats.
- Compute is_signed and bits only once and for the dst format. We were
computing these for the src format too but they were overwritten by the
dst values immediately after.
- Be more careful when selecting the integer path. Specifically, check that
both src and dst are integer types. Checking only one of them should suffice
since OpenGL does not allow conversions between normalized and integer types,
but putting extra care here makes sense and also makes the actual requirements
for this path more clear.
- The format argument for pack functions is the destination format we are
packing to, not the source format (which has to be RGBA).
- Expose RGBA8888_* to other files. These will come in handy when in need to
test if a given array format is RGBA or in need to pass RGBA formats to
mesa_format_convert.
v3 by Samuel Iglesias <[email protected]>:
- Add an RGBA8888_INT definition.
v4 by Iago Toral <[email protected]> after review by Jason Ekstrand:
- Added documentation for _mesa_format_convert.
- Added additional explanatory comments for integer conversions.
- Ensure that we use _messa_swizzle_and_convert for all signed source formats.
- Squashed: do not directly (un)pack to RGBA UINT if the source is not unsigned.
v5 by Iago Toral <[email protected]>:
- Adapted to the new implementation of mesa_array_format as a plain uint32_t
bitfield.
Reviewed-by: Jason Ekstrand <[email protected]>
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Fix various conversion paths that involved integer data types of different
sizes (uint16_t to uint8_t, int16_t to uint8_t, etc) that were not
being clamped properly.
Also, one of the paths was incorrectly assigning the value 12, instead of 1,
to the constant "one".
v2:
- Create auxiliary clamping functions and use them in all paths that
required clamp because of different source and destination sizes
and signed-unsigned conversions.
v3:
- Create MIN_INT macro and use it.
v4:
- Add _mesa_float_to_[un]signed() and mesa_half_to_[un]signed() auxiliary
functions.
- Add clamp for float-to-integer conversions in _mesa_swizzle_and_convert()
Signed-off-by: Samuel Iglesias Gonsalvez <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
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Signed-off-by: Jason Ekstrand <[email protected]>
v2 by Samuel Iglesias <[email protected]>:
- Fix compilation errors
Signed-off-by: Samuel Iglesias Gonsalvez <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
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This commits adds the _mesa_format_to_array function that determines if the
given format can be represented as an array format and computes the array
format parameters. This is a direct helper function for using
_mesa_swizzle_and_convert
v2: Better documentation and commit message
v3: Fixed a potential segfault from an invalid endianness swizzle
Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
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Most format conversion operations required by GL can be performed by
converting one channel at a time, shuffling the channels around, and
optionally filling missing channels with zeros and ones. This adds a
function to do just that in a general, yet efficient, way.
v2:
* Add better comments including full docs for functions
* Don't use __typeof__
* Use inline helpers instead of writing out conversions by hand,
* Force full loop unrolling for better performance
v3: Add another set of parens around the MAX_INT macro
Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
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