CI: Return to using mesa software drivers

When the CI pipeline was converted to Android 16, the mesa software
drivers (llvmpipe and lavapipe) were temporarily removed until mesa's
Android.mk build could be reconciled with the Soong build of mesa.

Keep the Soong blueprints for other devices, but use mesa's make files
to build llvmpipe and lavapipe. Use mesa drivers when running CI jobs.

Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Reviewed-by: Valentine Burley <valentine.burley@collabora.com>
Reviewed-by: Antonio Ospite <antonio.ospite@collabora.com>

.ci/.gitlab-ci.yml

@@ -18,7 +18,7 @@ debian/x86_64_cuttlefish:
     - .container
   timeout: 6h
   variables:
-    FDO_DISTRIBUTION_VERSION: "bookworm-slim"
+    FDO_DISTRIBUTION_VERSION: "trixie-slim"
     FDO_DISTRIBUTION_EXEC: 'bash .ci/container/debian/x86_64_cuttlefish.sh'
     HWC_TAG: $DEBIAN_CUTTLEFISH_TAG
   after_script:

.ci/container/debian/x86_64_cuttlefish.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# shellcheck disable=SC1091 # no need to follow references to other shell scripts
+# shellcheck disable=SC1090,SC1091 # no need to follow references to other shell scripts
 # For changes in this file to take effect, bump both:
 # DEBIAN_CUTTLEFISH_TAG and UBUNTU_ANDROID_TAG
 set -e
@@ -71,11 +71,13 @@ EPHEMERAL_DEPS=(
   glslang-tools
   gpg
   gpg-agent
-  libncurses5
+  libncurses-dev
+  meson
   ninja-build
   openssl
   openssh-client
   openssh-server
+  patch
   perl
   pkg-config
   pipx
@@ -135,8 +137,63 @@ DRMHWC_DIR="${TOP}/external/drm_hwcomposer"
 get_repo "${DRMHWC_DIR}"
 
 # Ensure that __ANDROID_API__ is defined as ANDROID_SDK_VERSION
+: "${ANDROID_SDK_VERSION:?ANDROID_SDK_VERSION is not set}"
 sed -i "/cc_defaults[[:space:]]*{/a\    min_sdk_version: \"${ANDROID_SDK_VERSION}\"," "${DRMHWC_DIR}/Android.bp"
 
+# Keep mesa's Android.bp files for other devices that reference them, but,
+# since the blueprint files don't support building lavapipe and llvmpipe for cuttlefish,
+# continue to use Android.mk for these drivers
+MESA3D_DIR="${TOP}/external/mesa3d"
+pushd "${MESA3D_DIR}"
+git remote add upstream https://gitlab.freedesktop.org/mesa/mesa.git
+git fetch upstream
+
+# Fetch upstream mesa at the commit which uses the static LLVM library available from AOSP.
+# When this commit is included in the next mesa release, then just use the released version.
+MESA3D_LLVM_COMMIT="9029c8b1e37"
+git restore --source="$MESA3D_LLVM_COMMIT" android/
+
+# Revert the commit which removed the libglapi module since we still
+# need it for the Android 16 build
+MESA3D_LIBGLAPI_COMMIT="a1333d60e9f"
+git log -1 -p "${MESA3D_LIBGLAPI_COMMIT}" | patch -p1 -R
+popd
+
+# Remove references to AOSP's vulkan.lvp to avoid conflicts with Mesa make files
+rm "${MESA3D_DIR}/src/gallium/targets/lavapipe/Android.bp"
+CUTTLEFISH_DEVICE_DIR="${TOP}/device/google/cuttlefish"
+sed -i '/"vulkan\.lvp"/d' "${CUTTLEFISH_DEVICE_DIR}/build/Android.bp"
+
+ALLOW_MESA_DIR="${TOP}/vendor/google/build/androidmk"
+mkdir -p "${ALLOW_MESA_DIR}"
+echo 'external/mesa3d/android/Android.mk' > "${ALLOW_MESA_DIR}/allowlist.txt"
+
+ALLOW_MESA_PRODUCT="${TOP}/device/google/cuttlefish/vsoc_x86_64/phone/aosp_cf.mk"
+sed -i '/^PRODUCT_ALLOWED_ANDROIDMK_FILES := art\/Android.mk$/ s|$| external/mesa3d/android/Android.mk|' \
+  "${ALLOW_MESA_PRODUCT}"
+
+cat >> "${CUTTLEFISH_DEVICE_DIR}/shared/virgl/BoardConfig.mk" <<EOF
+  BOARD_MESA3D_USES_MESON_BUILD := true
+  BOARD_MESA3D_GALLIUM_DRIVERS := llvmpipe
+  BOARD_MESA3D_VULKAN_DRIVERS := swrast
+EOF
+
+sed -i '$d' "${CUTTLEFISH_DEVICE_DIR}/shared/virgl/device_vendor.mk"
+cat >> "${CUTTLEFISH_DEVICE_DIR}/shared/virgl/device_vendor.mk" <<EOF
+  PRODUCT_PACKAGES += \\
+    libEGL_mesa \\
+    libGLESv1_CM_mesa \\
+    libGLESv2_mesa \\
+    libgallium_dri \\
+    libglapi \\
+    vulkan.lvp
+EOF
+
+CROSVM_FILE="${CUTTLEFISH_DEVICE_DIR}/host/libs/vm_manager/crosvm_manager.cpp"
+sed -i 's/\("androidboot.hardware.egl", \)"angle"/\1"mesa"/' "${CROSVM_FILE}"
+sed -i 's/\("androidboot.hardware.vulkan", \)"pastel"/\1"lvp"/' "${CROSVM_FILE}"
+sed -i '/"lvp"/a \        {"androidboot.hardware.hwcomposer.mode", "client"},' "${CROSVM_FILE}"
+
 # Don't block vkms
 BLOCKLIST="${TOP}/device/google/cuttlefish/shared/modules.blocklist"
 sed -i '/vkms/d' "$BLOCKLIST"