[Buildroot] [PATCH v3 2/2] package/qemu: add virglrenderer support

[Joseph Kogut <joseph.kogut@gmail.com>]

Add optional virglrenderer support, along with enabling OpenGL when
necessary.

https://qemu.readthedocs.io/en/v10.0.3/system/devices/virtio-gpu.html#virtio-gpu-virglrenderer

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
---
 package/qemu/Config.in | 28 ++++++++++++++++++++++++++++
 package/qemu/qemu.mk   | 15 ++++++++++++++-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/package/qemu/Config.in b/package/qemu/Config.in
index e16eafe446..25921368e9 100644
--- a/package/qemu/Config.in
+++ b/package/qemu/Config.in
@@ -116,6 +116,34 @@ config BR2_PACKAGE_QEMU_SDL
 	  Say 'y' to enable the SDL frontend, that is, a graphical
 	  window presenting the VM's display.
 
+comment "OpenGL and virglrenderer need an OpenGL and/or OpenGL EGL backend"
+	depends on !(BR2_PACKAGE_HAS_LIBEGL || BR2_PACKAGE_HAS_LIBGL)
+
+config BR2_PACKAGE_QEMU_OPENGL
+	bool "Enable OpenGL"
+	depends on BR2_PACKAGE_HAS_LIBEGL || BR2_PACKAGE_HAS_LIBGL # libepoxy
+	select BR2_PACKAGE_LIBEPOXY
+	help
+	  Say 'y' to enable OpenGL accelerated display frontend support.
+	  This is necessary to efficiently display frames rendered in a
+	  guest on the host.
+
+	  Run qemu with `-display sdl,gl=on`
+
+config BR2_PACKAGE_QEMU_VIRGLRENDERER
+	bool "Enable virglrenderer"
+	depends on BR2_PACKAGE_HAS_LIBEGL || BR2_PACKAGE_HAS_LIBGL # virglrenderer
+	select BR2_PACKAGE_QEMU_OPENGL
+	select BR2_PACKAGE_VIRGLRENDERER
+	help
+	  Say 'y' to enable virglrenderer, enabling GL and Vulkan
+	  passthrough from the host to the guest through virtio-gpu.
+	  This enables the guest to have accelerated GL and/or Vulkan.
+
+	  Run qemu with `-device virtio-gpu-gl`
+
+	  https://qemu.readthedocs.io/en/v10.0.3/system/devices/virtio-gpu.html#virtio-gpu-virglrenderer
+
 config BR2_PACKAGE_QEMU_FDT
 	bool "Enable FDT"
 	select BR2_PACKAGE_DTC
diff --git a/package/qemu/qemu.mk b/package/qemu/qemu.mk
index 97f8e22091..e250128dfa 100644
--- a/package/qemu/qemu.mk
+++ b/package/qemu/qemu.mk
@@ -274,6 +274,20 @@ else
 QEMU_OPTS += --disable-usb-redir
 endif
 
+ifeq ($(BR2_PACKAGE_QEMU_OPENGL),y)
+QEMU_OPTS += --enable-opengl
+QEMU_DEPENDENCIES += libepoxy
+else
+QEMU_OPTS += --disable-opengl
+endif
+
+ifeq ($(BR2_PACKAGE_QEMU_VIRGLRENDERER),y)
+QEMU_OPTS += --enable-virglrenderer
+QEMU_DEPENDENCIES += virglrenderer
+else
+QEMU_OPTS += --disable-virglrenderer
+endif
+
 ifeq ($(BR2_STATIC_LIBS),y)
 QEMU_OPTS += --static
 endif
@@ -330,7 +344,6 @@ define QEMU_CONFIGURE_CMDS
 			--disable-membarrier \
 			--disable-mpath \
 			--disable-netmap \
-			--disable-opengl \
 			--disable-oss \
 			--disable-pa \
 			--disable-plugins \

-- 
2.53.0

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