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2df17a12
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2022-05-25T16:18:37
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Vulkan: Pack driver uniforms
Previously 5 vec4s were used for driver uniforms + 2 vec4s if
specialization constants couldn't be supported.
The driver uniforms are rearranged and packed such that only 2 vec4s are
normally used, which include fallback for specialization constants as
well. In the future, most of the specialization constants may turn into
uniforms, and this change prepares for that.
Additional uniforms are used (3 vec4s) only if common extensions are
missing; transform feedback and bresenham lines.
This change makes it more practical for driver uniforms to be turned
into push constants. Additionally, these uniforms could potentially be
loaded and cached at the beginning of the shader for more efficient
memory access.
On Pixel6, with this change, the traces show no difference in wall time.
On most traces, CPU time shows up to ~7% improvement.
Bug: angleproject:7366
Change-Id: I0f47f863955af06a19c69d1f1d7c45b97d95476e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3668151
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>
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3b65b803
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2022-04-27T11:04:22
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Vulkan: Work around Qualcomm imprecision with dithering
On qualcomm, sometimes the output is ceil()ed instead of round()ed.
With ditering emulation affecting values, some dEQP tests fail due to
the excessive change in value when dithering bumps the value slightly
over to the next quantum.
In this change, a workaround is added to round() the value before
outputting it.
Bug: angleproject:6953
Change-Id: Iae7df5ca20055b4db3185c6153f3c0bf4ba07f68
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3611064
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
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665ddccd
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2021-12-09T23:06:39
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Vulkan: Emulate dithering
Dithering in OpenGL is vaguely defined, to the extent that no dithering
is also a valid dithering algorithm. Dithering is enabled by default,
but emulating it has a non-negligible cost. Similarly to some other
GLES drivers, ANGLE enables dithering only on low-bit formats where
visual banding is particularly common; namely RGBA4444, RGBA5551 and
RGB565.
Dithering is emulated in the fragment shader and is controlled by a spec
constant. Every 2 bits of the spec constant correspond to one
attachment, with the value indicating:
- 00: No dithering
- 01: Dither for RGBA4444
- 10: Dither for RGBA5551
- 11: Dither for RGB565
The translator appends code to the shader that, based on the format
specified by the specialization constant, adds dithering to each color
attachment output. A 2x2 Bayer matrix is used for dithering, indexed by
gl_FragCoord.xy % 2.
Bug: angleproject:6755
Change-Id: Ib45da5938e299b6626bff921119d63e7357dd353
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3374261
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
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