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// Copyright (c) 2022-2026 The Khronos Group Inc.
// Copyright (c) 2022-2026 Valve Corporation
// Copyright (c) 2022-2026 LunarG, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#version 460
#extension GL_GOOGLE_include_directive : enable
#extension GL_EXT_shader_explicit_arithmetic_types_int8 : require
#extension GL_EXT_shader_explicit_arithmetic_types_int16 : require
#include "common.h"
#include "build_acceleration_structures.h"
layout(push_constant, scalar)
uniform PushConstants {
BLASValidationShaderPushData pc;
};
// CPU will try to dispatch `primitive_count` threads
layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
layout(buffer_reference, scalar) buffer ArrayU8 { uint8_t array[]; };
layout(buffer_reference, scalar) buffer ArrayU16 { uint16_t array[]; };
layout(buffer_reference, scalar) buffer ArrayU32 { uint array[]; };
// From VkIndexType
const uint VK_INDEX_TYPE_UINT16 = 0;
const uint VK_INDEX_TYPE_UINT32 = 1;
const uint VK_INDEX_TYPE_UINT8 = 1000265000;
const uint VK_INDEX_TYPE_NONE_KHR = 1000165000;
uint LoadIndex(uint i) {
if (pc.index_type == VK_INDEX_TYPE_UINT16) {
ArrayU16 array_u16 = ArrayU16(pc.index_data + pc.primitive_offset);
return uint(array_u16.array[i]);
} else if (pc.index_type == VK_INDEX_TYPE_UINT32) {
ArrayU32 array_u32 = ArrayU32(pc.index_data + pc.primitive_offset);
return array_u32.array[i];
} else if (pc.index_type == VK_INDEX_TYPE_UINT8) {
ArrayU8 array_u8 = ArrayU8(pc.index_data + pc.primitive_offset);
return uint(array_u8.array[i]);
} else {
return 0;
}
}
void StoreIndex(uint i, uint value) {
if (pc.index_type == VK_INDEX_TYPE_UINT16) {
ArrayU16 array_u16 = ArrayU16(pc.index_data + pc.primitive_offset);
array_u16.array[i] = uint16_t(value);
} else if (pc.index_type == VK_INDEX_TYPE_UINT32) {
ArrayU32 array_u32 = ArrayU32(pc.index_data + pc.primitive_offset);
array_u32.array[i] = value;
} else if (pc.index_type == VK_INDEX_TYPE_UINT8) {
ArrayU8 array_u8 = ArrayU8(pc.index_data + pc.primitive_offset);
array_u8.array[i] = uint8_t(value);
}
}
void main() {
const uint gid = gl_GlobalInvocationID.x;
if (gid >= (3 * pc.primitive_count)) {
return;
}
const uint fetched_index = LoadIndex(gid);
if (pc.max_vertex < (pc.first_vertex + fetched_index)) {
// In practice an invalid index does not cause a device loss, so don't bother changing its value.
// Should someone add this back, a write barrier needs to be added on the CPU side.
// StoreIndex(gid, 0);
GpuavLogError4(kErrorGroup_GpuPreBuildAccelerationStructures, kErrorSubCode_PreBuildAccelerationStructures_MaxFetchedIndex, fetched_index, gid, pc.error_info_i, 0);
}
}
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