radv: Add radv_emulate_rt drirc and enable for Indiana Jones TGC

There have been various people successfully trying it out on GFX9-GFX10.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34114>

src/amd/vulkan/radv_instance.c

@@ -192,6 +192,7 @@ static const driOptionDescription radv_dri_options[] = {
       DRI_CONF_RADV_SSBO_NON_UNIFORM(false)
       DRI_CONF_RADV_LOWER_TERMINATE_TO_DISCARD(false)
       DRI_CONF_RADV_APP_LAYER()
+      DRI_CONF_RADV_EMULATE_RT(false)
    DRI_CONF_SECTION_END
 };
 // clang-format on
@@ -286,6 +287,8 @@ radv_init_dri_options(struct radv_instance *instance)
 
    instance->drirc.lower_terminate_to_discard =
       driQueryOptionb(&instance->drirc.options, "radv_lower_terminate_to_discard");
+
+   instance->drirc.emulate_rt = driQueryOptionb(&instance->drirc.options, "radv_emulate_rt");
 }
 
 static const struct vk_instance_extension_table radv_instance_extensions_supported = {

src/amd/vulkan/radv_instance.h

@@ -72,6 +72,7 @@ struct radv_instance {
       bool disable_dcc_mips;
       bool disable_dcc_stores;
       bool lower_terminate_to_discard;
+      bool emulate_rt;
       char *app_layer;
       uint8_t override_graphics_shader_version;
       uint8_t override_compute_shader_version;

src/amd/vulkan/radv_physical_device.c

@@ -150,7 +150,11 @@ bool
 radv_emulate_rt(const struct radv_physical_device *pdev)
 {
    const struct radv_instance *instance = radv_physical_device_instance(pdev);
-   return instance->perftest_flags & RADV_PERFTEST_EMULATE_RT;
+   if (instance->perftest_flags & RADV_PERFTEST_EMULATE_RT)
+      return true;
+
+   /* Do not force emulated RT on GPUs that have native support. */
+   return !pdev->info.has_image_bvh_intersect_ray && instance->drirc.emulate_rt;
 }
 
 static void

src/util/00-radv-defaults.conf

@@ -114,6 +114,7 @@ Application bugs worked around in this file:
             <option name="radv_disable_dcc_stores" value="true" />
             <option name="radv_invariant_geom" value="true" />
             <option name="radv_lower_terminate_to_discard" value="true" />
+            <option name="radv_emulate_rt" value="true" />
         </application>
 
         <application name="DOOM (2016)" application_name_match="DOOM$">

src/util/driconf.h

@@ -798,6 +798,10 @@
 #define DRI_CONF_RADV_DISABLE_NGG_GS(def) \
    DRI_CONF_OPT_B(radv_disable_ngg_gs, def, "Disable NGG GS on GFX10/GFX10.3.")
 
+#define DRI_CONF_RADV_EMULATE_RT(def) \
+   DRI_CONF_OPT_B(radv_emulate_rt, def, \
+                  "Expose RT extensions on GFX10 and below through software emulation.")
+
 /**
  * \brief ANV specific configuration options
  */