Mesa (master): radv: add support for querying which formats support texture gather LOD

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Module: Mesa
Branch: master
Commit: 2e265b94a2b7a8b681a95d512ad991d6ae3fb69a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2e265b94a2b7a8b681a95d512ad991d6ae3fb69a

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Tue May 19 15:05:32 2020 +0200

radv: add support for querying which formats support texture gather LOD

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5147>

---

 src/amd/vulkan/radv_formats.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/amd/vulkan/radv_formats.c b/src/amd/vulkan/radv_formats.c
index badfcc4f72f..2e753f47be8 100644
--- a/src/amd/vulkan/radv_formats.c
+++ b/src/amd/vulkan/radv_formats.c
@@ -1380,6 +1380,7 @@ VkResult radv_GetPhysicalDeviceImageFormatProperties2(
 	VkExternalImageFormatProperties *external_props = NULL;
 	struct VkAndroidHardwareBufferUsageANDROID *android_usage = NULL;
 	VkSamplerYcbcrConversionImageFormatProperties *ycbcr_props = NULL;
+	VkTextureLODGatherFormatPropertiesAMD *texture_lod_props = NULL;
 	VkResult result;
 	VkFormat format = radv_select_android_external_format(base_info->pNext, base_info->format);
 
@@ -1411,6 +1412,9 @@ VkResult radv_GetPhysicalDeviceImageFormatProperties2(
 		case VK_STRUCTURE_TYPE_ANDROID_HARDWARE_BUFFER_USAGE_ANDROID:
 			android_usage = (void *) s;
 			break;
+		case VK_STRUCTURE_TYPE_TEXTURE_LOD_GATHER_FORMAT_PROPERTIES_AMD:
+			texture_lod_props = (void *) s;
+			break;
 		default:
 			break;
 		}
@@ -1454,6 +1458,14 @@ VkResult radv_GetPhysicalDeviceImageFormatProperties2(
 		ycbcr_props->combinedImageSamplerDescriptorCount = vk_format_get_plane_count(format);
 	}
 
+	if (texture_lod_props) {
+		if (physical_device->rad_info.chip_class >= GFX9) {
+			texture_lod_props->supportsTextureGatherLODBiasAMD = true;
+		} else {
+			texture_lod_props->supportsTextureGatherLODBiasAMD = !vk_format_is_int(format);
+		}
+	}
+
 	return VK_SUCCESS;
 
 fail: