1/* 2 * Copyright © 2022 Konstantin Seurer 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24#version 460 25 26#extension GL_GOOGLE_include_directive : require 27 28#extension GL_EXT_shader_explicit_arithmetic_types_int8 : require 29#extension GL_EXT_shader_explicit_arithmetic_types_int16 : require 30#extension GL_EXT_shader_explicit_arithmetic_types_int32 : require 31#extension GL_EXT_shader_explicit_arithmetic_types_int64 : require 32#extension GL_EXT_shader_explicit_arithmetic_types_float16 : require 33#extension GL_EXT_scalar_block_layout : require 34#extension GL_EXT_buffer_reference : require 35#extension GL_EXT_buffer_reference2 : require 36 37#include "vk_build_interface.h" 38 39layout(local_size_x_id = SUBGROUP_SIZE_ID, local_size_y = 1, local_size_z = 1) in; 40 41layout(push_constant) uniform CONSTS { 42 morton_args args; 43}; 44 45uint32_t 46morton_component(uint32_t x) 47{ 48 x = (x * 0x00000101u) & 0x0F00F00Fu; 49 x = (x * 0x00000011u) & 0xC30C30C3u; 50 x = (x * 0x00000005u) & 0x49249249u; 51 return x; 52} 53 54uint32_t 55morton_code(uint32_t x, uint32_t y, uint32_t z) 56{ 57 return (morton_component(x) << 2) | (morton_component(y) << 1) | morton_component(z); 58} 59 60uint32_t 61lbvh_key(float x01, float y01, float z01) 62{ 63 return morton_code(uint32_t(x01 * 255.0), uint32_t(y01 * 255.0), uint32_t(z01 * 255.0)) << 8; 64} 65 66void 67main(void) 68{ 69 uint32_t global_id = gl_GlobalInvocationID.x; 70 71 REF(key_id_pair) key_id = INDEX(key_id_pair, args.ids, global_id); 72 73 uint32_t id = DEREF(key_id).id; 74 75 uint32_t key; 76 if (id != VK_BVH_INVALID_NODE) { 77 vk_aabb bounds = DEREF(REF(vk_ir_node)OFFSET(args.bvh, ir_id_to_offset(id))).aabb; 78 vec3 center = (bounds.min + bounds.max) * 0.5; 79 80 vk_aabb bvh_bounds; 81 bvh_bounds.min.x = from_emulated_float(DEREF(args.header).min_bounds[0]); 82 bvh_bounds.min.y = from_emulated_float(DEREF(args.header).min_bounds[1]); 83 bvh_bounds.min.z = from_emulated_float(DEREF(args.header).min_bounds[2]); 84 bvh_bounds.max.x = from_emulated_float(DEREF(args.header).max_bounds[0]); 85 bvh_bounds.max.y = from_emulated_float(DEREF(args.header).max_bounds[1]); 86 bvh_bounds.max.z = from_emulated_float(DEREF(args.header).max_bounds[2]); 87 88 vec3 normalized_center = (center - bvh_bounds.min) / (bvh_bounds.max - bvh_bounds.min); 89 90 key = lbvh_key(normalized_center.x, normalized_center.y, normalized_center.z); 91 } else { 92 /* Move null instances to the end to avoid mixing null instances with active instances. This 93 * way, we can skip early during traversal. 94 */ 95 key = 0xFFFFFFFF; 96 } 97 DEREF(key_id).key = key; 98} 99