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Add storage buffer memory qualifier and run time array stride information
to QShaderDescription::StorageBlock.
Memory qualifiers allow more informed selection of RHI resource buffer
binding (bufferLoad / bufferStore / bufferLoadStore) function.
Run time array stride (for last block member unsized array) allows
packing of buffer data for transfer to / from GPU. Without this
information, applications must infer or guess which packing rules
(std430 / std140) are in use.
Change-Id: I676d7e848afefd40d01cdd463c569b07022b683e
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
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Change-Id: Ie8d226a6a959aa5e78284ea72505fd26aec1e671
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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Adds the following in a QShader/QShaderDescription:
- a list of separate images
- a list of separate samplers
- a list of "combined_sampler_uniform_name" -> [
separate_texture_binding, separate_sampler_binding ] mappings
(relevant for GLSL only)
On the QShader (and qsb/QShaderBaker) level not having separate image
(texture) and sampler objects exposed in the reflection info is not
entirely future proof. Right now we benefit strongly from the fact
that Vulkan/SPIR-V supports both combined and separate
images/samplers, while for HLSL and MSL SPIRV-Cross translates
combined image samplers to separate texture and sampler objects, but
it is not given that relying on combined image samplers will always be
possible in the long run; it is mostly a legacy OpenGL thing that just
happens to be supported in Vulkan/SPIR-V due to some benefits with
certain implementations/hw, but is not something present in any newer
APIs.
In addition, before this patch, attempting to run a shader with
separate textures and samplers through qsb will just fail for GLSL,
even though SPIRV-Cross does have the ability to generate a "fake"
combined sampler for each separate texture+sampler combination. Take
this into use. This also involves generating and exposing a
combined_name->[separate_texture_binding,separate_sampler_binding]
mapping table for GLSL, not unlike we have the native binding map for
HLSL and MSL. A user (such as, the GL backend of QRhi) would then use
this table to recognize what user-provided texture+sampler binding
point numbers correspond to which auto-generated sampler2Ds in the GL
program.
Take the following example:
layout(binding = 1) uniform texture2D sepTex;
layout(binding = 2) uniform sampler sepSampler;
layout(binding = 3) uniform sampler sepSampler2;
Inn the reflection info (QShaderDescription) this (assuming a
corresponding qtshadertools patch in place) now gives one entry in
separateImages() and two in separateSamplers(). Assuming sepTex is
used both with sepSampler and sepSampler2, the GLSL output and mapping
table from QShaderBaker will have two auto-generated sampler2Ds (and
no 'texture2D' or 'sampler').
One immediate benefit is that it is now possible to create a shader
that relies only on separate images and samplers, feed it into qsb,
generate all the possible targets, and then also feed the SPIR-V
binary into a tool or library such as Tint (e.g. to generate WGSL)
that canot deal with combined image samplers.
Change-Id: I9b19847ea5854837b45d3a23edc788c48502aa15
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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We only support version 4 and 5 in Qt 6.0. 1 and 2 are already gone
(due to being based on binary JSON), now we remove 3 as well.
Task-number: QTBUG-81346
Change-Id: I3627dcc0587f1e36f11e93edf7172889e911d64e
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
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Only keep 3, 4, and 5 because 3 is the lowest version where binary JSON
is not used anymore.
Change-Id: Id0319e8eceb845017ed493d0ef6902b53050d5a6
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
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...but keep support for deserializing for all older versions in order to play
nice with existing .qsb files.
The usage of binary JSON and then CBOR is a historical artifact: relying
on the QJsonDocument (which we generate for purposes unrelated to binary
serialization) was a convenient shortcut. However, writing to and
reading from a QDataStream instead (which QShader already does) is trivial.
In order not to be limited by potential CBOR requirements in the future,
take it all into our own hands.
Extend the qshader autotest accordingly.
Task-number: QTBUG-81298
Change-Id: If0047b659bd6601ca47b5bbbce1b719630cde01e
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
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Binary JSON is said to become deprecated. Therefore, add support
for CBOR. Binary JSON is still supported for deserialization, so
all existing .qsb files will continue to work, as long as the
binaryjson feature is enabled in the Qt build.
Also makes QShaderDescription comparable. This is important for
tests in particular.
A nice side effect of using CBOR is that .qsb files become smaller.
For a typical Qt Quick material shader this can mean a reduction of
300 bytes or more.
Task-number: QTBUG-79576
Change-Id: I5547c0266e3e8128c9653e954e47487352267f71
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
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Comes with backends for Vulkan, Metal, Direct3D 11.1, and OpenGL (ES).
All APIs are private for now.
Shader conditioning (i.e. generating a QRhiShader in memory or on disk
from some shader source code) is done via the tools and APIs provided
by qt-labs/qtshadertools.
The OpenGL support follows the cross-platform tradition of requiring
ES 2.0 only, while optionally using some (ES) 3.x features. It can
operate in core profile contexts as well.
Task-number: QTBUG-70287
Change-Id: I246f2e36d562e404012c05db2aa72487108aa7cc
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
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