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radv: Report smaller bvh sizes when possible
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Reviewed-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37830>
This commit is contained in:
Konstantin Seurer 2025-08-29 10:12:15 +02:00 • committed by Marge Bot
parent 7809af5e46
commit 95a89f7b33
1 changed files with 18 additions and 2 deletions
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20
src/amd/vulkan/radv_acceleration_structure.c
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@ -84,7 +84,19 @@ radv_get_acceleration_structure_layout(struct radv_device *device,
{
const struct radv_physical_device *pdev = radv_device_physical(device);
uint32_t internal_count = MAX2(state->leaf_node_count, 2) - 1;
uint32_t internal_node_max_child_count = radv_use_bvh8(pdev) ? 8 : 4;
/* There are no internal nodes with only one child node except the root node which does't matter here. */
uint32_t last_internal_node_min_child_count = 2;
/* With pair compression on GFX12, internal nodes with two triangles are always collapsed so they don't exist. the
* minimum child count therefore has to be 3.
*/
if (state->config.encode_key[0] & (RADV_ENCODE_KEY_PAIR_COMPRESS_GFX12 | RADV_ENCODE_KEY_BATCH_COMPRESS_GFX12))
last_internal_node_min_child_count = 3;
/* See CalcAccelStructInternalNodeCount (gpurt). */
uint32_t internal_count = (state->leaf_node_count * internal_node_max_child_count) /
(last_internal_node_min_child_count * (internal_node_max_child_count - 1)) +
1;
VkGeometryTypeKHR geometry_type = vk_get_as_geometry_type(state->build_info);
@ -122,7 +134,11 @@ radv_get_acceleration_structure_layout(struct radv_device *device,
uint32_t internal_node_size =
radv_use_bvh8(pdev) ? sizeof(struct radv_gfx12_box_node) : sizeof(struct radv_bvh_box32_node);
uint64_t bvh_size = bvh_leaf_size * state->leaf_node_count + internal_node_size * internal_count;
uint32_t hw_leaf_node_count = state->leaf_node_count;
if (state->config.encode_key[0] & RADV_ENCODE_KEY_BATCH_COMPRESS_GFX12)
hw_leaf_node_count = DIV_ROUND_UP(hw_leaf_node_count, 2);
uint64_t bvh_size = bvh_leaf_size * hw_leaf_node_count + internal_node_size * internal_count;
uint32_t offset = 0;
offset += sizeof(struct radv_accel_struct_header);