media-libs/mesa-amber: Fix loading i915c driver

Thanks to Allan Mondor <bugs.gentoo@acmondor.ca> for the patch.

Closes: https://bugs.gentoo.org/866425
Signed-off-by: Matt Turner <mattst88@gentoo.org>

2 files changed, 50 insertions, 0 deletions

diff --git a/media-libs/mesa-amber/files/mesa-amber-i915c.patch b/media-libs/mesa-amber/files/mesa-amber-i915c.patch
new file mode 100644
index 000000000000..826f8cb3ca86
--- /dev/null
+++ b/media-libs/mesa-amber/files/mesa-amber-i915c.patch
@@ -0,0 +1,46 @@
+
+This patch is fixed the issue created when /usr/lib/dri/i915_dri.so is renamed to /usr/lib/dri/i915c_dri.so
+by mesa-amber/mesa-amber-21.3.9.ebuild
+
+Without this patch the driver cannot be loaded using the environment variable MESA_LOADER_DRIVER_OVERRIDE="i915c"
+as that mechanism expects to find the __driDriverGetExtensions_i915c:
+
+MESA-LOADER: dlopen(/usr/lib/dri/i915c_dri.so)
+MESA-LOADER: driver does not expose __driDriverGetExtensions_i915c(): /usr/lib/dri/i915c_dri.so: undefined symbol: __driDriverGetExtensions_i915c
+MESA-LOADER: dlopen(/usr/lib/dri/swrast_dri.so)
+
+This patch adds the __driDriverGetExtensions_i915c symbol by simply cloning the code for the original
+__driDriverGetExtensions_i915 symbol.
+
+Allan Mondor
+bugs.gentoo@acmondor.ca
+
+
+diff -w -ruN mesa-21.3.9.org/src/mesa/drivers/dri/i915/intel_screen.c mesa-21.3.9/src/mesa/drivers/dri/i915/intel_screen.c
+--- mesa-21.3.9.org/src/mesa/drivers/dri/i915/intel_screen.c	2022-06-08 12:13:35.000000000 -0600
++++ mesa-21.3.9/src/mesa/drivers/dri/i915/intel_screen.c	2022-08-23 11:32:19.151578025 -0600
+@@ -1290,6 +1290,13 @@
+    return i915_driver_extensions;
+ }
+ 
++PUBLIC const __DRIextension **__driDriverGetExtensions_i915c(void)
++{
++   globalDriverAPI = &i915_driver_api;
++
++   return i915_driver_extensions;
++}
++
+ PUBLIC const __DRIextension **__driDriverGetExtensions_i830(void)
+ {
+    globalDriverAPI = &i915_driver_api;
+diff -w -ruN mesa-21.3.9.org/src/mesa/drivers/dri/i915/intel_screen.h mesa-21.3.9/src/mesa/drivers/dri/i915/intel_screen.h
+--- mesa-21.3.9.org/src/mesa/drivers/dri/i915/intel_screen.h	2022-06-08 12:13:35.000000000 -0600
++++ mesa-21.3.9/src/mesa/drivers/dri/i915/intel_screen.h	2022-08-23 11:31:54.047576393 -0600
+@@ -160,6 +160,7 @@
+ 
+ const __DRIextension **__driDriverGetExtensions_i830(void);
+ const __DRIextension **__driDriverGetExtensions_i915(void);
++const __DRIextension **__driDriverGetExtensions_i915c(void);
+ extern const __DRI2fenceExtension intelFenceExtension;
+ 
+ extern GLboolean
diff --git a/media-libs/mesa-amber/mesa-amber-21.3.9.ebuild b/media-libs/mesa-amber/mesa-amber-21.3.9-r1.ebuild
index 6c7e27f41616..9c94daeeb8f3 100644
--- a/media-libs/mesa-amber/mesa-amber-21.3.9.ebuild
+++ b/media-libs/mesa-amber/mesa-amber-21.3.9-r1.ebuild
@@ -94,6 +94,10 @@ x86? (
 	usr/lib/libGLX_amber.so.0.0.0
 )"
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-i915c.patch
+)
+
 python_check_deps() {
 	python_has_version ">=dev-python/mako-0.8.0[${PYTHON_USEDEP}]"
 }