package/ci: run GLES tests on Linux with SwiftShader.

doc/changelog.dox

@@ -132,6 +132,11 @@ See also:
     @ref Trade::TgaImporter "TgaImporter" now properly reports an error message
     when opening an empty file
 
+@subsection changelog-latest-buildsystem Build system
+
+-   ES 2.0 and ES 3.0 subset of tests requiring GL context is now run on Travis
+    CI using SwiftShader for better code coverage
+
 @subsection changelog-latest-bugfixes Bug fixes
 
 -   Fixed compilation of the @ref Vk library on 32-bit Windows

package/ci/travis-desktop-gles.sh

@@ -20,9 +20,12 @@ cmake .. \
     -DCMAKE_CXX_FLAGS="$CMAKE_CXX_FLAGS" \
     -DCMAKE_PREFIX_PATH="$HOME/deps" \
     -DCMAKE_BUILD_TYPE=Debug \
+    -DEGL_LIBRARY=$HOME/swiftshader/libEGL.so \
+    -DOPENGLES2_LIBRARY=$HOME/swiftshader/libGLESv2.so \
+    -DOPENGLES3_LIBRARY=$HOME/swiftshader/libGLESv2.so \
+    -DCMAKE_INSTALL_RPATH=$HOME/swiftshader \
     -DTARGET_GLES=ON \
     -DTARGET_GLES2=$TARGET_GLES2 \
-    -DTARGET_DESKTOP_GLES=ON \
     -DWITH_AUDIO=ON \
     -DWITH_SHAPES=ON \
     -DWITH_VK=OFF \
@@ -51,4 +54,7 @@ cmake .. \
     -G Ninja
 # Otherwise the job gets killed (probably because using too much memory)
 ninja -j4
-CORRADE_TEST_COLOR=ON ctest -V -E GLTest
+CORRADE_TEST_COLOR=ON ctest -V
+if [ "$TARGET_GLES2" == "ON" ]; then CORRADE_TEST_COLOR=ON MAGNUM_DISABLE_EXTENSIONS="OES_vertex_array_object" ctest -V -R GLTest; fi
+src/Magnum/Audio/magnum-al-info > /dev/null
+src/Magnum/Platform/magnum-gl-info > /dev/null

package/ci/travis.yml

@@ -174,6 +174,7 @@ notifications:
 cache:
   directories:
   - $HOME/sdl2
+  - $HOME/swiftshader
   - $HOME/cmake
 
 install:
@@ -182,7 +183,8 @@ install:
 - if [ "$BUILD_DEPRECATED" != "OFF" ]; then export BUILD_DEPRECATED=ON; fi
 - if [ "$TRAVIS_OS_NAME" == "linux" ] && [ "$TARGET" == "desktop" ] && [ "$BUILD_DEPRECATED" == "ON" ]; then export WITH_GLUTAPPLICATION=ON; fi
 - if [ "$WITH_GLUTAPPLICATION" != "ON" ]; then export WITH_GLUTAPPLICATION=OFF; fi
-- if [ "$TRAVIS_OS_NAME" == "linux" ] && [ ! "$TARGET" == "desktop-vulkan" ]; then export PLATFORM_GL_API=GLX; fi
+- if [ "$TRAVIS_OS_NAME" == "linux" ] && [ "$TARGET" == "desktop" ]; then export PLATFORM_GL_API=GLX; fi
+- if [ "$TRAVIS_OS_NAME" == "linux" ] && [ "$TARGET" == "desktop-gles" ]; then export PLATFORM_GL_API=EGL; fi
 - if [ "$TRAVIS_OS_NAME" == "linux" ] && [ "$TARGET" == "android" ]; then wget -nc https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip && unzip -q android-*.zip; fi
 # Download CMake 3.1.3 to ensure we're still compatible with it (Travis has
 # 3.9 since December 2017). Also, the PATH setting can't be cached, so it's
@@ -206,6 +208,10 @@ install:
 # GLFW (cached)
 - if [ "$TRAVIS_OS_NAME" == "osx" ] && [ "$TARGET" == "desktop" ]; then HOMEBREW_NO_AUTO_UPDATE=1 brew install glfw; fi
 
+# SwiftShader on Linux (cached). Taken from Chromium snapshot 587878
+# (swiftshader-bin Arch package).
+- if [ "$TRAVIS_OS_NAME" == "linux" ] && [ "$TARGET" == "desktop-gles" ] && [ ! -e "$HOME/swiftshader/libEGL.so" ]; then cd $HOME ; wget https://ci.magnum.graphics/swiftshader-chromium-587878.tar.gz && mkdir -p swiftshader && cd swiftshader && tar -xzf ../swiftshader-chromium-587878.tar.gz && cd $TRAVIS_BUILD_DIR ; fi
+
 script:
 - if [ "$TRAVIS_OS_NAME" == "linux" ] && ( [ "$TARGET" == "desktop" ] || [ "$TARGET" == "desktop-sanitizers" ] ); then ./package/ci/travis-desktop.sh; fi
 # Vulkan needs to be in a separate build, because it needs new CMake (for the