anv: Implement VK_EXT_texel_buffer_alignment

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

src/intel/vulkan/anv_device.c

@@ -1142,6 +1142,13 @@ void anv_GetPhysicalDeviceFeatures2(
          break;
       }
 
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TEXEL_BUFFER_ALIGNMENT_FEATURES_EXT: {
+         VkPhysicalDeviceTexelBufferAlignmentFeaturesEXT *features =
+            (VkPhysicalDeviceTexelBufferAlignmentFeaturesEXT *)ext;
+         features->texelBufferAlignment = true;
+         break;
+      }
+
       case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VARIABLE_POINTERS_FEATURES: {
          VkPhysicalDeviceVariablePointersFeatures *features = (void *)ext;
          features->variablePointersStorageBuffer = true;
@@ -1567,6 +1574,36 @@ void anv_GetPhysicalDeviceProperties2(
          break;
       }
 
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TEXEL_BUFFER_ALIGNMENT_PROPERTIES_EXT: {
+         VkPhysicalDeviceTexelBufferAlignmentPropertiesEXT *props =
+            (VkPhysicalDeviceTexelBufferAlignmentPropertiesEXT *)ext;
+
+         /* From the SKL PRM Vol. 2d, docs for RENDER_SURFACE_STATE::Surface
+          * Base Address:
+          *
+          *    "For SURFTYPE_BUFFER non-rendertarget surfaces, this field
+          *    specifies the base address of the first element of the surface,
+          *    computed in software by adding the surface base address to the
+          *    byte offset of the element in the buffer. The base address must
+          *    be aligned to element size."
+          *
+          * The typed dataport messages require that things be texel aligned.
+          * Otherwise, we may just load/store the wrong data or, in the worst
+          * case, there may be hangs.
+          */
+         props->storageTexelBufferOffsetAlignmentBytes = 16;
+         props->storageTexelBufferOffsetSingleTexelAlignment = true;
+
+         /* The sampler, however, is much more forgiving and it can handle
+          * arbitrary byte alignment for linear and buffer surfaces.  It's
+          * hard to find a good PRM citation for this but years of empirical
+          * experience demonstrate that this is true.
+          */
+         props->uniformTexelBufferOffsetAlignmentBytes = 1;
+         props->uniformTexelBufferOffsetSingleTexelAlignment = false;
+         break;
+      }
+
       case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_TRANSFORM_FEEDBACK_PROPERTIES_EXT: {
          VkPhysicalDeviceTransformFeedbackPropertiesEXT *props =
             (VkPhysicalDeviceTransformFeedbackPropertiesEXT *)ext;

src/intel/vulkan/anv_extensions.py

@@ -145,6 +145,7 @@ EXTENSIONS = [
     Extension('VK_EXT_separate_stencil_usage',            1, True),
     Extension('VK_EXT_shader_stencil_export',             1, 'device->info.gen >= 9'),
     Extension('VK_EXT_shader_viewport_index_layer',       1, True),
+    Extension('VK_EXT_texel_buffer_alignment',            1, True),
     Extension('VK_EXT_transform_feedback',                1, True),
     Extension('VK_EXT_vertex_attribute_divisor',          3, True),
     Extension('VK_EXT_ycbcr_image_arrays',                1, True),