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Add source code for RRA V1.1 release
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‎.gitignore

+4
Original file line numberDiff line numberDiff line change
@@ -5,8 +5,12 @@ __pycache__/
55
build/linux
66
build/mac
77
build/win
8+
cmake-build*/
9+
.idea/
810
documentation/build
911
documentation/source/_build
12+
source/frontend/version.h
13+
Buildinfo.properties
1014
external
1115
.vscode
1216
*.aps

‎Buildinfo.properties.in

+2
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,2 @@
1+
BUILD_NUMBER=@RRA_BUILD_NUMBER@
2+
VERSION_NUMBER=@RRA_MAJOR_VERSION@.@RRA_MINOR_VERSION@

‎CMakeLists.txt

+56-35
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,22 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/source/renderer/
55
## Specify the top level name of the project - this will define the solution name for Visual Studio
66
project(RRA)
77

8+
# Define version information
9+
set(RRA_MAJOR_VERSION 1)
10+
set(RRA_MINOR_VERSION 1)
11+
if (NOT RRA_BUGFIX_NUMBER)
12+
set(RRA_BUGFIX_NUMBER 0)
13+
endif ()
14+
if (NOT RRA_BUILD_NUMBER)
15+
set(RRA_BUILD_NUMBER 0)
16+
endif ()
17+
string(TIMESTAMP DATE "\"%m/%d/%Y\"")
18+
string(TIMESTAMP YEAR "%Y")
19+
string(TIMESTAMP YEAR_STRING "\"%Y\"")
20+
21+
configure_file("${CMAKE_SOURCE_DIR}/Buildinfo.properties.in" "${CMAKE_SOURCE_DIR}/Buildinfo.properties")
22+
configure_file("${CMAKE_SOURCE_DIR}/source/frontend/version.h.in" "${CMAKE_SOURCE_DIR}/source/frontend/version.h")
23+
824
option(RDF_ENABLE_CXX_BINDINGS "Allow usage of C++ interface for RDF library" ON)
925
option(RDF_STATIC "Build RDF as a static library" OFF)
1026

@@ -19,7 +35,7 @@ IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
1935
ENDIF()
2036

2137
set (CMAKE_DEBUG_POSTFIX -d)
22-
set (CMAKE_RELEASE_POSTFIX )
38+
set (CMAKE_RELEASE_POSTFIX)
2339

2440
IF(WIN32)
2541
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_BINARY_DIR}/../release)
@@ -50,7 +66,7 @@ IF(WIN32)
5066
add_link_options(/STACK:16777216)
5167
ELSEIF(UNIX)
5268
# Use -Wno-missing-field-initializers for CentOS compiler warning
53-
add_compile_options(-D_LINUX -Wno-missing-field-initializers -Wno-ignored-qualifiers)
69+
add_compile_options(-D_LINUX -Wno-missing-field-initializers -Wno-ignored-qualifiers -mno-avx2)
5470
# Allow executable to be double clicked.
5571
add_link_options(-no-pie)
5672
# Use _DEBUG on Unix for Debug Builds (defined automatically on Windows)
@@ -121,18 +137,13 @@ ENDIF(WIN32)
121137
# This is evaluated at project build time - not at CMake generation time
122138
set(BUILD_ROOT $<$<CONFIG:debug>:${CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG}>$<$<CONFIG:release>:${CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE}>)
123139

124-
# Define the option to pass to the sphinx documentation job
125-
set(SPHINX_OPTION public)
126-
127-
find_program(SPHINX_EXECUTABLE sphinx-build)
128-
if(NOT SPHINX_EXECUTABLE)
129-
message(FATAL_ERROR "SPHINX_EXECUTABLE (sphinx-build) is not found!")
130-
endif()
140+
set(DOCS_OUTPUT_DIR ${BUILD_ROOT})
131141

132142
# group sphinx source files into a sphinx folder
133143
file(GLOB SPHINX_DOC_FILES ${SPHINX_DOC_FILES} ${CMAKE_SOURCE_DIR}/documentation/source/*.rst)
134144
set (SPHINX_DOC_MAIN ${CMAKE_SOURCE_DIR}/documentation/source/conf.py)
135-
source_group("sphinx" FILES ${SPHINX_DOC_FILES} ${SPHINX_DOC_MAIN})
145+
set (ALL_SPHINX_FILES ${SPHINX_DOC_FILES} ${SPHINX_DOC_MAIN})
146+
source_group("sphinx" FILES ${ALL_SPHINX_FILES})
136147

137148
# group release documents into a release_docs folder
138149
set (RELEASE_DOCS_IN_ROOT
@@ -144,33 +155,43 @@ set (RELEASE_DOCS_IN_ROOT
144155
set (RELEASE_DOCS ${RELEASE_DOCS_IN_ROOT})
145156
source_group("release_docs" FILES ${RELEASE_DOCS})
146157

147-
# hang the sphinx build on the conf.py file and specify a dummy output ("sphinx_output")
148-
# this ensures the sphinx docs are built everytime you ask to build the Documentation target
149-
# Sphinx has proper dependency checking, so this works as expected.
150-
# Once built, clean up any unneeded files.
151-
add_custom_target(Documentation SOURCES ${SPHINX_DOC_FILES} ${RELEASE_DOCS} DEPENDS sphinx_output)
152-
add_custom_command(MAIN_DEPENDENCY ${SPHINX_DOC_MAIN} OUTPUT sphinx_output
153-
COMMAND ${CMAKE_COMMAND} -E echo "building Sphinx documentation"
154-
COMMAND ${SPHINX_EXECUTABLE} ${CMAKE_SOURCE_DIR}/documentation/source ${BUILD_ROOT}/docs/help/rra/html/. -t ${SPHINX_OPTION}
155-
COMMAND ${CMAKE_COMMAND} -E remove_directory ${BUILD_ROOT}/docs/help/rra/html/.doctrees
156-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/blas_instance_list.html
157-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/blas_list.html
158-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/blas_properties.html
159-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/blas_viewer.html
160-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/capture.html
161-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/overview.html
162-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/settings.html
163-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/tlas_instance_list.html
164-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/tlas_properties.html
165-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/tlas_viewer.html
166-
COMMAND ${CMAKE_COMMAND} -E remove ${BUILD_ROOT}/docs/help/rra/html/triangle_list.html
167-
)
158+
find_program(SPHINX_EXECUTABLE sphinx-build)
159+
if(SPHINX_EXECUTABLE)
160+
# Define the option to pass to the sphinx documentation job
161+
set(SPHINX_OPTION public)
162+
163+
# hang the sphinx build on the conf.py file and specify a dummy output ("sphinx_output")
164+
# this ensures the sphinx docs are built everytime you ask to build the Documentation target
165+
# Sphinx has proper dependency checking, so this works as expected.
166+
# Once built, clean up any unneeded files.
167+
add_custom_target(Documentation ALL SOURCES ${ALL_SPHINX_FILES} ${RELEASE_DOCS} DEPENDS sphinx_output)
168+
add_custom_command(MAIN_DEPENDENCY ${SPHINX_DOC_MAIN} OUTPUT sphinx_output
169+
COMMAND ${CMAKE_COMMAND} -E echo "building Sphinx documentation"
170+
COMMAND ${SPHINX_EXECUTABLE} ${CMAKE_SOURCE_DIR}/documentation/source ${DOCS_OUTPUT_DIR}/docs/help/rra/html/. -t ${SPHINX_OPTION}
171+
COMMAND ${CMAKE_COMMAND} -E remove_directory ${DOCS_OUTPUT_DIR}/docs/help/rra/html/.doctrees
172+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/blas_instance_list.html
173+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/blas_list.html
174+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/blas_properties.html
175+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/blas_viewer.html
176+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/capture.html
177+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/overview.html
178+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/settings.html
179+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/tlas_instance_list.html
180+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/tlas_properties.html
181+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/tlas_viewer.html
182+
COMMAND ${CMAKE_COMMAND} -E remove ${DOCS_OUTPUT_DIR}/docs/help/rra/html/triangle_list.html
183+
)
184+
else()
185+
message(WARNING "SPHINX_EXECUTABLE (sphinx-build) is not found! Documentation will not be built!")
186+
# If the sphinx binary isn't found, then just create the Documentation project with only the release docs in it.
187+
add_custom_target(Documentation ALL SOURCES ${ALL_SPHINX_FILES} ${RELEASE_DOCS})
188+
endif()
168189

169190
add_custom_command(TARGET Documentation POST_BUILD
170191
COMMAND ${CMAKE_COMMAND} -E echo "copying Documentation to output directory"
171-
COMMAND ${CMAKE_COMMAND} -E make_directory ${BUILD_ROOT}/docs
172-
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${RELEASE_DOCS_IN_ROOT} ${BUILD_ROOT}/.
192+
COMMAND ${CMAKE_COMMAND} -E make_directory ${DOCS_OUTPUT_DIR}/docs
193+
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${RELEASE_DOCS_IN_ROOT} ${DOCS_OUTPUT_DIR}/.
173194
COMMAND ${CMAKE_COMMAND} -E echo "copying Samples to output directory"
174-
COMMAND ${CMAKE_COMMAND} -E make_directory ${BUILD_ROOT}/samples
175-
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_SOURCE_DIR}/samples/landscape.rra ${BUILD_ROOT}/samples/sample_trace.rra
195+
COMMAND ${CMAKE_COMMAND} -E make_directory ${DOCS_OUTPUT_DIR}/samples
196+
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_SOURCE_DIR}/samples/landscape.rra ${DOCS_OUTPUT_DIR}/samples/sample_trace.rra
176197
)

‎shaders/GeometryColorFinalOpacity.ps.spv

1.26 KB
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‎shaders/GeometryColorFinalOpacity.vs.spv

5.13 KB
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‎shaders/GeometryColorRebraiding.ps.spv

1.26 KB
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‎shaders/GeometryColorRebraiding.vs.spv

4.63 KB
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‎shaders/GeometryColorTriangleSplitting.ps.spv

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‎shaders/GeometryColorTriangleSplitting.vs.spv

4.93 KB
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‎source/assets/third_party/ionicons/information-circle-outline.svg

+1
Loading

‎source/backend/api_info.cpp

+1-2
Original file line numberDiff line numberDiff line change
@@ -46,7 +46,6 @@ namespace rra
4646
uint64_t payload_size = chunk_file.GetChunkDataSize(identifier);
4747

4848
std::vector<std::uint8_t> header(header_size);
49-
std::vector<std::uint8_t> payload(payload_size);
5049

5150
if (header_size > 0)
5251
{
@@ -55,7 +54,7 @@ namespace rra
5554

5655
if (payload_size > 0)
5756
{
58-
chunk_file.ReadChunkDataToBuffer(identifier, this);
57+
chunk_file.ReadChunkDataToBuffer(identifier, &chunk_data_);
5958
}
6059

6160
chunk_data_valid_ = true;

‎source/backend/asic_info.cpp

+11-2
Original file line numberDiff line numberDiff line change
@@ -46,7 +46,6 @@ namespace rra
4646
uint64_t payload_size = chunk_file.GetChunkDataSize(identifier);
4747

4848
std::vector<std::uint8_t> header(header_size);
49-
std::vector<std::uint8_t> payload(payload_size);
5049

5150
if (header_size > 0)
5251
{
@@ -55,7 +54,7 @@ namespace rra
5554

5655
if (payload_size > 0)
5756
{
58-
chunk_file.ReadChunkDataToBuffer(identifier, this);
57+
chunk_file.ReadChunkDataToBuffer(identifier, &chunk_data_);
5958
}
6059

6160
chunk_data_valid_ = true;
@@ -210,4 +209,14 @@ namespace rra
210209
return kRraOk;
211210
}
212211

212+
RraErrorCode AsicInfo::GetGfxIpLevelMajor(uint16_t* out_gfx_ip_level)
213+
{
214+
if (!chunk_data_valid_)
215+
{
216+
return kRraErrorMalformedData;
217+
}
218+
*out_gfx_ip_level = chunk_data_.gfx_ip_level.major;
219+
return kRraOk;
220+
}
221+
213222
} // namespace rra

‎source/backend/asic_info.h

+7
Original file line numberDiff line numberDiff line change
@@ -110,6 +110,13 @@ namespace rra
110110
/// @return kRraOk if successful or error code if not.
111111
RraErrorCode GetVideoMemoryBusWidth(int32_t* out_bus_width) const;
112112

113+
/// @brief Get the Gfx ip level major.
114+
///
115+
/// @param [out] A variable to receive the gfx ip level major.
116+
///
117+
/// @return kRraOk if successful or error code if not.
118+
RraErrorCode GetGfxIpLevelMajor(uint16_t* out_gfx_ip_level);
119+
113120
/// @brief enum of GPU types.
114121
enum class TraceGpuType : uint32_t
115122
{

‎source/backend/bvh/bvh_bundle.cpp

+29-14
Original file line numberDiff line numberDiff line change
@@ -132,25 +132,28 @@ namespace rta
132132
return empty_placeholder_;
133133
}
134134

135-
/// @brief Load a "RawAccelStruc" chunk.
135+
/// @brief Load a "RawAccelStruct" chunk.
136136
///
137-
/// @param [in] chunk_file The chunk file to load from.
138-
/// @param [in] chunk_index The chunk index in the chunk file.
139-
/// @param [in] chunk_header Reference to the chunk header data.
140-
/// @param [in] import_option Flag indicating which sections of the chunk to load/discard.
137+
/// @param [in] chunk_file The chunk file to load from.
138+
/// @param [in] chunk_index The chunk index in the chunk file.
139+
/// @param [in] chunk_header Reference to the chunk header data.
140+
/// @param [in] chunk_identifier The BVH chunk name.
141+
/// @param [in] import_option Flag indicating which sections of the chunk to load/discard.
142+
/// @param [out] bvh The loaded BVH data.
141143
///
142144
/// @return The BVH object loaded in if successful or nullptr if error.
143145
static std::unique_ptr<IBvh> LoadRtIp11RawAccelStrucAtChunkFileIndex(rdf::ChunkFile& chunk_file,
144146
const std::int32_t chunk_index,
145147
const RawAccelStructRdfChunkHeader& chunk_header,
148+
const char* const chunk_identifier,
146149
const BvhBundleReadOption import_option,
147150
std::unique_ptr<IEncodedRtIp11Bvh>&& bvh)
148151
{
149-
const std::uint32_t version = chunk_file.GetChunkVersion(IEncodedRtIp11Bvh::kChunkIdentifier, chunk_index);
152+
const std::uint32_t version = chunk_file.GetChunkVersion(chunk_identifier, chunk_index);
150153
std::uint32_t major_version = version >> 16;
151154
if (major_version <= GPURT_ACCEL_STRUCT_MAJOR_VERSION)
152155
{
153-
if (bvh->LoadRawAccelStrucFromFile(chunk_file, chunk_index, chunk_header, import_option) == true)
156+
if (bvh->LoadRawAccelStrucFromFile(chunk_file, chunk_index, chunk_header, chunk_identifier, import_option) == true)
154157
{
155158
return std::move(bvh);
156159
}
@@ -172,7 +175,11 @@ namespace rta
172175
{
173176
try
174177
{
175-
chunk_file.ContainsChunk(identifier);
178+
bool result = chunk_file.ContainsChunk(identifier);
179+
if (result == false)
180+
{
181+
return result;
182+
}
176183
}
177184
catch (...)
178185
{
@@ -195,7 +202,16 @@ namespace rta
195202
RraErrorCode* io_error_code)
196203
{
197204
// Check if all expected identifiers are contained in the chunk file
198-
if (!IdentifiersContainedInChunkFile({IEncodedRtIp11Bvh::kChunkIdentifier}, chunk_file))
205+
const char* bvh_identifier = nullptr;
206+
if (IdentifiersContainedInChunkFile({IEncodedRtIp11Bvh::kAccelChunkIdentifier1}, chunk_file))
207+
{
208+
bvh_identifier = IEncodedRtIp11Bvh::kAccelChunkIdentifier1;
209+
}
210+
else if (IdentifiersContainedInChunkFile({IEncodedRtIp11Bvh::kAccelChunkIdentifier2}, chunk_file))
211+
{
212+
bvh_identifier = IEncodedRtIp11Bvh::kAccelChunkIdentifier2;
213+
}
214+
else
199215
{
200216
*io_error_code = kRraErrorNoASChunks;
201217
return nullptr;
@@ -204,7 +220,6 @@ namespace rta
204220
std::vector<std::unique_ptr<IBvh>> top_level_bvhs;
205221
std::vector<std::unique_ptr<IBvh>> bottom_level_bvhs;
206222

207-
const auto bvh_identifier = IEncodedRtIp11Bvh::kChunkIdentifier;
208223
const auto bvh_chunk_count = chunk_file.GetChunkCount(bvh_identifier);
209224

210225
std::unordered_map<GpuVirtualAddress, std::uint64_t> tlas_map;
@@ -233,8 +248,8 @@ namespace rta
233248
// Call the load function here, passing in a reference to the header as a parameter.
234249
if (header.flags.blas == 1)
235250
{
236-
bottom_level_bvhs.emplace_back(
237-
LoadRtIp11RawAccelStrucAtChunkFileIndex(chunk_file, ci, header, import_option, std::make_unique<EncodedRtIp11BottomLevelBvh>()));
251+
bottom_level_bvhs.emplace_back(LoadRtIp11RawAccelStrucAtChunkFileIndex(
252+
chunk_file, ci, header, bvh_identifier, import_option, std::make_unique<EncodedRtIp11BottomLevelBvh>()));
238253
if (bottom_level_bvhs.back() == nullptr)
239254
{
240255
*io_error_code = kRraErrorMalformedData;
@@ -249,8 +264,8 @@ namespace rta
249264
}
250265
else
251266
{
252-
top_level_bvhs.emplace_back(
253-
LoadRtIp11RawAccelStrucAtChunkFileIndex(chunk_file, ci, header, import_option, std::make_unique<EncodedRtIp11TopLevelBvh>()));
267+
top_level_bvhs.emplace_back(LoadRtIp11RawAccelStrucAtChunkFileIndex(
268+
chunk_file, ci, header, bvh_identifier, import_option, std::make_unique<EncodedRtIp11TopLevelBvh>()));
254269
if (top_level_bvhs.back() == nullptr)
255270
{
256271
*io_error_code = kRraErrorMalformedData;

‎source/backend/bvh/dxr_definitions.h

-1
Original file line numberDiff line numberDiff line change
@@ -172,7 +172,6 @@ namespace dxr
172172
constexpr std::uint32_t kInvalidNode = UINT32_MAX;
173173
constexpr std::uint32_t kInstanceNodeSize = 128;
174174
constexpr std::uint32_t kFp32BoxNodeSize = 128;
175-
constexpr std::uint32_t kFp32HalfBoxNodeSize = kFp32BoxNodeSize / 2;
176175
constexpr std::uint32_t kFp16BoxNodeSize = 64;
177176
constexpr std::uint32_t kLeafNodeSize = 64;
178177
constexpr std::uint32_t kInstanceExtraDataSize = 64;

‎source/backend/bvh/encoded_rt_ip_11_bottom_level_bvh.cpp

+3-2
Original file line numberDiff line numberDiff line change
@@ -96,9 +96,10 @@ namespace rta
9696
bool EncodedRtIp11BottomLevelBvh::LoadRawAccelStrucFromFile(rdf::ChunkFile& chunk_file,
9797
const std::uint64_t chunk_index,
9898
const RawAccelStructRdfChunkHeader& chunk_header,
99+
const char* const chunk_identifier,
99100
const BvhBundleReadOption import_option)
100101
{
101-
const auto identifier = IEncodedRtIp11Bvh::kChunkIdentifier;
102+
const auto identifier = chunk_identifier;
102103
const auto data_size = chunk_file.GetChunkDataSize(identifier, static_cast<uint32_t>(chunk_index));
103104
const bool skip_meta_data = static_cast<std::uint8_t>(import_option) & static_cast<std::uint8_t>(BvhBundleReadOption::kNoMetaData);
104105

@@ -113,7 +114,7 @@ namespace rta
113114
memcpy(&meta_data_, buffer.data() + chunk_header.meta_header_offset, chunk_header.meta_header_size);
114115
}
115116

116-
if (buffer.size() < (dxr::amd::kAccelerationStructureHeaderSize + chunk_header.header_offset))
117+
if (buffer.size() < ((size_t)dxr::amd::kAccelerationStructureHeaderSize + chunk_header.header_offset))
117118
{
118119
return false;
119120
}

‎source/backend/bvh/encoded_rt_ip_11_bottom_level_bvh.h

+6-4
Original file line numberDiff line numberDiff line change
@@ -57,15 +57,17 @@ namespace rta
5757

5858
/// @brief Load the BVH data from a file.
5959
///
60-
/// @param [in] chunk_file A Reference to a ChunkFile object which describes the file chunk being loaded.
61-
/// @param [in] chunk_index The index of the chunk in the file.
62-
/// @param [in] header The raw acceleration structure header.
63-
/// @param [in] import_option Flag indicating which sections of the chunk to load/discard.
60+
/// @param [in] chunk_file A Reference to a ChunkFile object which describes the file chunk being loaded.
61+
/// @param [in] chunk_index The index of the chunk in the file.
62+
/// @param [in] header The raw acceleration structure header.
63+
/// @param [in] chunk_identifier The BVH chunk name.
64+
/// @param [in] import_option Flag indicating which sections of the chunk to load/discard.
6465
///
6566
/// @return true if the BVH data loaded successfully, false if not.
6667
bool LoadRawAccelStrucFromFile(rdf::ChunkFile& chunk_file,
6768
const std::uint64_t chunk_index,
6869
const RawAccelStructRdfChunkHeader& header,
70+
const char* const chunk_identifier,
6971
const BvhBundleReadOption import_option) override;
7072

7173
/// @brief Do the post-load step.

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