Non-strict line interpolation and rasterization

Firstly non-strict line rasterization (parallelogram decomposed to
triangles) is changed to use the TriangleInterpolator do determine
interpolated colours. Line endpoint attributes are duplicated to the
end vertices of parallelogram lines, which means that interpolation is
not along the normal of the line, but would be parallel to the major

For the interpolation to be calculated correctly by the
TriangleInterpolator, the triangle geometry needed to be produced with
the correct w values from the line endpoints, previously the triangle
was generated pre-projected with 1.0 for the W-coordinates. The
perspective interpolation previously was calculated separately using
the original line parameters passed to MultisampleLineInterpolator.

The second part of the change is to allow for a non-strict line 'GLES'
centric relaxation - GLES specified 1px non-antialiased lines would use
the 'diamond-exit' rule to produce bresenham lines. Vulkan only
specified parallelograms, but not all GLES implementations are able
to disable the 1px bresenham behaviour.

All changes are in verifyMultisameplLineGroupInterpolation and
verifyMultisameplLineGroupInterpolationInternal. Strict lines are not

This fixes Imaginations 1.2.2.x failures in:




Components: Framework

VK-GL-CTS Issue: 2274

Change-Id: I0cfd496969512bdbf9d0156ea8f43e737c44512f
1 file changed
tree: 6772e69e2ee98bbfa79711f87707e7cade622bed
  1. .github/
  2. android/
  3. data/
  4. doc/
  5. execserver/
  6. executor/
  7. external/
  8. framework/
  9. modules/
  10. scripts/
  11. targets/
  12. .editorconfig
  13. .gitignore
  14. .travis.yml
  17. CMakeLists.txt
  21. NOTICE
  22. OWNERS


This repository contains a GPU testing suite called dEQP (drawElements Quality Program). dEQP contains tests for several graphics APIs, including OpenGL ES, EGL, and Vulkan.


Up-to-date documentation for the dEQP is available at Android Open Source Project site.

The .qpa logs generated by the conformance tests may contain embedded png images of the results. These can be viewed with the Cherry tool.

Khronos Vulkan Conformance Tests

This repository includes Khronos Vulkan CTS under external/vulkancts directory. For more information see Vulkan CTS README.

Khronos OpenGL / OpenGL ES Conformance Tests

This repository includes Khronos OpenGL / OpenGL ES CTS under external/openglcts directory. For more information see OpenGL / OpenGL ES CTS README.

ANGLE for Android

ANGLE can be built for Android by following the instructions here.

The resulting ANGLE shared object libraries can be linked against and embedded into dEQP.apk with the --angle-path option. This will cause dEQP.apk to use the ANGLE libraries for OpenGL ES calls, rather than the native drivers.

An ABI must be specified and the directory structure containing the ANGLE shared objects must match it so the build system can find the correct *.so files.

Assuming ANGLE shared objects are generated into ~/chromium/src/out/Release/ and dEQP.apk will be generated with --abis arm64-v8a, issue the following commands:

cd ~/chromium/src/out/Release/
mkdir arm64-v8a && cd arm64-v8a
cp ../lib* .

The --angle-path ~/chromium/src/out/Release/ option can then be used to link against and embed the ANGLE shared object files. The full command would be:

python scripts/android/ --sdk <path to Android SDK> --ndk <path to Android NDK> --abis arm64-v8a --angle-path ~/chromium/src/out/Release/