Vulkan CTS README
=================

This document describes how to build and run Vulkan Conformance Test suite.

Vulkan CTS is built on dEQP framework. dEQP documentation is available
at http://source.android.com/devices/graphics/testing.html


Requirements
------------

### Common

The following tools must be installed and present in the PATH variable:

 * Git (for checking out sources)
 * Python 3.x (for the build related scripts, some other scripts still use Python 2.7.x)
 * CMake 3.10.2 or newer

### Win32

 * Visual Studio 2015 or newer (glslang uses several C++11 features)

### Linux

 * Standard toolchain (make, gcc/clang)
 * If you have X11 installed, then the build assumes you also have the `GL/glx.h` header
   file.
    * You can get this from the `mesa-common-dev` Ubuntu package.

### Android

 * Android NDK r17c or later.
 * Android SDK with: SDK Tools, SDK Platform-tools, SDK Build-tools, and API 28
 * Java Development Kit (JDK)
 * Windows: either NMake or Ninja in PATH

If you have downloaded the Android SDK command line tools package (25.2.3 or higher) then
you can install the necessary components by running:

	tools/bin/sdkmanager tools platform-tools 'build-tools;25.0.2' 'platforms;android-28'


Building CTS
------------

To build dEQP, you need first to download sources for zlib, libpng, glslang,
spirv-headers, and spirv-tools.

To download sources, run:

	python external/fetch_sources.py

You may need to re-run `fetch_sources.py` to update to the latest glslang and
spirv-tools revisions occasionally.

With CMake out-of-source builds are always recommended. Create a build directory
of your choosing, and in that directory generate Makefiles or IDE project
using cmake.


### Windows x86-32

	cmake <path to vulkancts> -G"Visual Studio 14"
	start dEQP-Core-default.sln

### Windows x86-64

	cmake <path to vulkancts> -G"Visual Studio 14 Win64"
	start dEQP-Core-default.sln

### Linux 32-bit Debug

	cmake <path to vulkancts> -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_FLAGS=-m32 -DCMAKE_CXX_FLAGS=-m32
	make -j

Release build can be done by using -DCMAKE_BUILD_TYPE=Release

If building for 32-bit x86 with GCC, you probably also want to add `-msse2
-mfpmath=sse` to ensure that you get correct IEEE floating-point behavior.

### Linux 64-bit Debug

	cmake <path to vulkancts> -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_FLAGS=-m64 -DCMAKE_CXX_FLAGS=-m64
	make -j

### Android

Following command will build dEQP.apk:

	python scripts/android/build_apk.py --sdk <path to Android SDK> --ndk <path to Android NDK>

By default the CTS package will be built for the Android API level 28.
Another API level may be supplied using --native-api command line option.

The package can be installed by either running:

	python scripts/android/install_apk.py

By default the CTS package will contain libdeqp.so built for armeabi-v7a, arm64-v8a,
x86, and x86_64 ABIs, but that can be changed at build time by passing the --abis command line
option to `scripts/android/build_apk.py`.

To pick which ABI to use at _install time_, use the following command instead:

	adb install -g --abi <ABI name> <build-root>/package/dEQP.apk


Building Mustpass
-----------------

Current mustpass is checked into repository and can be found at:

	external/vulkancts/mustpass/master/vk-default.txt

Vulkan CTS mustpass can be re-generated by running:

	python <vulkancts>/external/vulkancts/scripts/build_mustpass.py


Running CTS
-----------

Following command line options MUST be used when running CTS:

	--deqp-caselist-file=<vulkancts>/external/vulkancts/mustpass/master/vk-default.txt
	--deqp-log-images=disable
	--deqp-log-shader-sources=disable

In addition on multi-device systems the device for which conformance is claimed
can be selected with:

	--deqp-vk-device-id=<value>

To speed up the conformance run on some platforms the following command line
option may be used to disable frequent fflush() calls to the output logs:

	--deqp-log-flush=disable

By default, the test log will be written into the path "TestResults.qpa". If the
platform requires a different path, it can be specified with:

	--deqp-log-filename=<path>

By default, the CTS will expect to find its test resource files in the current
working directory. This can be overridden with:

	--deqp-archive-dir=<path>

By default, the shader cache will be written into the path "shadercache.bin". If the
platform requires a different path, it can be specified with:

	--deqp-shadercache-filename=<path>

If the shader cache is not desired, it can be disabled with:

	--deqp-shadercache=disable

CTS execution may be split into N fractions ( for the purpose of running it in parallel ) using

	--deqp-fraction=I,N

where I denotes index of current CTS execution ( I=[0..N-1], N=[1..8] )

When collecting results for a Conformance Submission Package the number of fractions must not exceed 8,
and a list of mandatory information tests for each fraction must be supplied:

	--deqp-fraction-mandatory-caselist-file=<vulkancts>external/vulkancts/mustpass/master/vk-fraction-mandatory-tests.txt

To specify file containing waived tests that are omitted only by specified vendor and renderer/device
the following command line option may be used:

	--deqp-waiver-file=<path>

Some CTS tests use third-party runners. By default all tests are executed
regardless of runner type (`any`). To exclude all tests using any of the
external runners (`none`) or to only include tests using a certain runner:

	--deqp-runner-type=(any|none|amber)

No other command line options are allowed.

### Win32

	cd <builddir>/external/vulkancts/modules/vulkan
	Debug\deqp-vk.exe --deqp-caselist-file=...

Test log will be written into TestResults.qpa

### Linux

	cd <builddir>/external/vulkancts/modules/vulkan
	./deqp-vk --deqp-caselist-file=...

### Android

	adb push <vulkancts>/external/vulkancts/mustpass/master/vk-default.txt /sdcard/vk-default.txt
	adb shell

In device shell:

	am start -n com.drawelements.deqp/android.app.NativeActivity -e cmdLine "deqp --deqp-caselist-file=/sdcard/vk-default.txt --deqp-log-images=disable --deqp-log-shader-sources=disable --deqp-log-filename=/sdcard/TestResults.qpa"

Test progress will be written to device log and can be displayed with:

	adb logcat -s dEQP

Test log will be written into `/sdcard/TestResults.qpa`.


Conformance Submission Package Requirements
-------------------------------------------

The conformance submission package must contain the following:

1. Full test logs (`TestResults.qpa`) from CTS runs against all driver builds and all fractions
2. Result of `git status` and `git log` from CTS source directory
3. Any patches used on top of release tag
4. Conformance statement

Test logs (1) should be named `<submission pkg dir>/TestResults-<driver build type>-<fraction id>-of-<total fractions>.qpa`,
for example `TestResults-armeabi-v7a-1-of-8.qpa`. On platforms where multiple different driver
builds (for example 64-bit and 32-bit) are present, CTS logs must be provided
for each driver build as part of the submission package. If CTS run was split into multiple
fractions then result files for all fractions must be provided, each file must
contain results of the mandatory information tests.

Fractions may be run on different physical devices but each device must represent
the same Conformant Product.

Test logs generated on a system which exposes more than one physical device
in a device group can be used for products that expose one or more physical
devices in their device group.

The CTS build must always be done from clean git repository that doesn't have any
uncommitted changes. Thus it is necessary to run and capture output of `git
status` and `git log` (2) in the source directory:

	git status > <submission pkg dir>/git-status.txt
	git log --first-parent <release tag>^..HEAD > <submission pkg dir>/git-log.txt

Any changes made to CTS must be committed to the local repository, and provided
as part of the submission package (3). This can be done by running:

	git format-patch -o <submission pkg dir> <release tag>..HEAD

Changes to platform-specific code (mostly under `framework/platform`)
are allowed. The commit message for each change must include a clear
description of the change and why it is necessary.

Bugfixes to the tests are allowed. Before being used for a submission,
bugfixes must be accepted and merged into the CTS repository.
`git cherry-pick` is strongly recommended as a method of applying bug fixes.

Other changes must be accompanied by a waiver (see below).

NOTE: When cherry-picking patches on top of release tag, please use `git cherry-pick -x`
to include original commit hash in the commit message.

Conformance statement (4) must be included in a file called `STATEMENT-<adopter>`
and must contain following:

	CONFORM_VERSION:         <git tag of CTS release>
	PRODUCT:                 <string-value>
	CPU:                     <string-value>
	OS:                      <string-value>

Note that product/cpu/os information is also captured in `dEQP-VK.info.*` tests
if `vk::Platform::describePlatform()` is implemented.

If the submission package covers multiple products, you can list them by appending
additional `PRODUCT:` lines to the conformance statement. For example:

	CONFORM_VERSION:         vulkan-cts-1.2.6.0
	PRODUCT:                 Product A
	PRODUCT:                 Product B
	...

The actual submission package consists of the above set of files which must
be bundled into a gzipped tar file named `VK<API major><API minor>_<adopter><_info>.tgz`.
`<API major>` is the major version of the Vulkan API specification, `<API minor>`is the minor
version of the Vulkan API specification.
`<adopter>` is the name of the Adopting member company, or some recognizable abbreviation.
The `<_info>` field is optional. It may be used to uniquely identify a submission
by OS, platform, date, or other criteria when making multiple submissions.
For example, a company XYZ may make a submission for a Vulkan 1.1 implementation named
`VK11_XYZ_PRODUCTA_Windows10.tgz`

One way to create a suiteable gzipped tar file is to execute the command:

	tar -cvzf <filename.tgz> -C <submission pkg dir> .

where `<submission pkg dir>` is the directory containing the files from (1)-(4)
from above. A submission package must contain all of the files listed above,
and only those files.

As an example submission package could contain:

	STATEMENT-Khronos
	git-log.txt
	git-status.txt
	0001-Remove-Waived-Filtering-Tests.patch
	0002-Fix-Pipeline-Parameters.patch
	TestResults-armeabi-v7a.qpa
	TestResults-arm64-v8a.qpa


Waivers
-------

The process for requesting a waiver is to report the issue by filing a bug
report in the Gitlab VulkanCTS project (TODO Github?). When creating the
submission package, include references to the waiver in the commit message of
the relevant change. Including as much information as possible in your bug
report (including a unified diff or a merge request of suggested file changes)
will ensure the issue can be progressed as rapidly as possible. Issues must
be labeled "Waiver" (TODO!) and identify the version of the CTS and affected
tests.

Conformance Criteria
--------------------

Conformance run is considered passing if all tests finish with allowed result
codes. Test results are contained in the TestResults.qpa log. Each
test case section contains XML tag Result, for example:

	<Result StatusCode="Pass">Not validated</Result>

The result code is the value of the StatusCode attribute. Following status
codes are allowed:

	Pass
	NotSupported
	QualityWarning
	CompatibilityWarning
	Waiver

Submission package can be verified using `verify_submission.py`
script located in [VK-GL-CTS-Tools](https://github.com/KhronosGroup/VK-GL-CTS-Tools).

Vulkan platform port
--------------------

Vulkan support from Platform implementation requires providing
`getVulkanPlatform()` method in `tcu::Platform` class implementation.

See `framework/common/tcuPlatform.hpp` and examples in
`framework/platform/win32/tcuWin32Platform.cpp` and
`framework/platform/android/tcuAndroidPlatform.cpp`.

If any WSI extensions are supported, platform port must also implement
methods for creating native display (`vk::Platform::createWsiDisplay`)
and window handles (`vk::wsi::Display::createWindow`). Otherwise tests
under `dEQP-VK.wsi` will fail.


Null (dummy) driver
-------------------

For testing and development purposes it might be useful to be able to run
tests on dummy Vulkan implementation. One such implementation is provided in
vkNullDriver.cpp. To use that, implement `vk::Platform::createLibrary()` with
`vk::createNullDriver()`.


Validation Layers
-----------------

Vulkan CTS framework includes first-party support for validation layers, that
can be turned on with `--deqp-validation=enable` command line option.

When validation is turned on, default instance and device will be created with
validation layers enabled and debug callback is registered to record any
messages. Debug messages collected during test execution will be included at
the end of the test case log.

In addition, when the `--deqp-print-validation-errors` command line option is
used, validation errors are additionally printed to standard error in the
moment they are generated.

If any validation errors are found, test result will be set to `InternalError`.

By default `VK_DEBUG_REPORT_INFORMATION_BIT_EXT` and `_DEBUG_BIT_EXT` messages
are excluded from the log, but that can be customized by modifying
`vk::DebugReportMessage::shouldBeLogged()` in `vkDebugReportUtil.hpp`.

On the Android target, layers can be added to the APK during the build process
by setting the `--layers-path` command line option to point into the NDK or to
a locally-built layers tree. The layers are expected to be found under $abi/
under the layers path.


Cherry GUI
----------

Vulkan test module can be used with Cherry (GUI for test execution and
analysis). Cherry is available at
https://android.googlesource.com/platform/external/cherry. Please follow
instructions in README to get started.

Before first launch, and every time test hierarchy has been modified, test
case list must be refreshed by running:

	python scripts/build_caselists.py path/to/cherry/data

Cherry must be restarted for the case list update to take effect.


Shader Optimizer
----------------

Vulkan CTS can be optionally run with the shader optimizer enabled. This
is an experimental feature which can be used to further stress both the
drivers as well as the optimizer itself. The shader optimizer is disabled
by default.

The following command line options can be used to configure the shader
optimizer:

	--deqp-optimization-recipe=<number>

The list of the optimization recipes can be found and customized in the
`optimizeCompiledBinary()` function in `vkPrograms.cpp`.

As of this writing, there are 2 recipes to choose from:

	0. Disabled (default)
	1. Optimize for performance
	2. Optimize for size

The performance and size optimization recipes are defined by the spir-v
optimizer, and will change from time to time as the optimizer matures.

	--deqp-optimize-spirv=enable

This option is not required to run the optimizer. By default, the shader
optimizer only optimizes shaders generated from GLSL or HLSL, and leaves
hand-written SPIR-V shaders alone.

Many of the hand-written SPIR-V tests stress specific features of the
SPIR-V which might get optimized out. Using this option will enable the
optimizer on the hand-written SPIR-V as well, which may be useful in
finding new bugs in drivers or the optimizer itself, but will likely
invalidate the tests themselves.


Shader Cache
------------

The Vulkan CTS framework contains a shader cache for speeding up the running
of the CTS. Skipping shader compilation can significantly reduce runtime,
especially for repeated runs.

Default behavior is to have the shader cache enabled, but truncated at the
start of the CTS run. This still gives the benefit of skipping shader
compilation for identical shaders in different tests (which there are many),
while making sure that the shader cache file does not grow indefinitely.

The shader cache identifies the shaders by hashing the shader source code
along with various bits of information that may affect the shader compilation
(such as shader stage, CTS version, possible compilation flags, etc). If a
cached shader with matching hash is found, a byte-by-byte comparison of the
shader sources is made to make sure that the correct shader is being
retrieved from the cache.

The behavior of the shader cache can be modified with the following command
line options:

	--deqp-shadercache=disable

Disable the shader cache. All shaders will be compiled every time.

	--deqp-shadercache-filename=<filename>

Set the name of the file where the cached shaders will be stored. This
option may be required for the shader cache to work at all on Android
targets.

	--deqp-shadercache-truncate=disable

Do not truncate the shader cache file at startup. No shader compilation will
occur on repeated runs of the CTS.


RenderDoc
---------
The RenderDoc (https://renderdoc.org/) graphics debugger may be used to debug
Vulkan tests.

Following command line option should be used when launching tests from
RenderDoc UI:

	--deqp-renderdoc=enable

This causes the framework to interface with the debugger and mark each dEQP
test case as a separate 'frame', just for the purpose of capturing. The frames
are added using RenderDoc 'In-Application API', instead of swapchain operations.