radv: Add a driconf to advertise rt pipelines

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20464>

src/amd/vulkan/radv_device.c

@@ -1144,6 +1144,7 @@ static const driOptionDescription radv_dri_options[] = {
       DRI_CONF_RADV_FLUSH_BEFORE_QUERY_COPY(false)
       DRI_CONF_RADV_ENABLE_UNIFIED_HEAP_ON_APU(false)
       DRI_CONF_RADV_TEX_NON_UNIFORM(false)
+      DRI_CONF_RADV_RT(false)
    DRI_CONF_SECTION_END
 };
 // clang-format on

src/amd/vulkan/radv_rt_common.c

@@ -35,7 +35,8 @@ radv_enable_rt(const struct radv_physical_device *pdevice, bool rt_pipelines)
       return false;
 
    if (rt_pipelines)
-      return pdevice->instance->perftest_flags & RADV_PERFTEST_RT;
+      return (pdevice->instance->perftest_flags & RADV_PERFTEST_RT) ||
+             driQueryOptionb(&pdevice->instance->dri_options, "radv_rt");
 
    return true;
 }

src/util/driconf.h

@@ -599,6 +599,10 @@
    DRI_CONF_OPT_B(radv_tex_non_uniform, def, \
                   "Always mark texture sample operations as non-uniform.")
 
+#define DRI_CONF_RADV_RT(def) \
+   DRI_CONF_OPT_B(radv_rt, def, \
+                  "Expose support for VK_KHR_ray_tracing_pipeline")
+
 /**
  * \brief ANV specific configuration options
  */