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chore: add byteoffset to gltf loading accessors

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Jan 2024-09-03 19:02:25 +02:00
parent f4092972e8
commit 30d9ffd8c9
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5 changed files with 33 additions and 26 deletions
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7
src/ObjLoading/XModel/Gltf/GltfLoader.cpp
View File

@ -636,12 +636,13 @@ namespace
throw GltfLoadException("Accessor references invalid buffer view");
const auto* bufferView = m_buffer_views[*jAccessor.bufferView].get();
const auto byteOffset = jAccessor.byteOffset.value_or(0u);
if (jAccessor.componentType == JsonAccessorComponentType::FLOAT)
m_accessors.emplace_back(std::make_unique<FloatAccessor>(bufferView, jAccessor.type, jAccessor.count));
m_accessors.emplace_back(std::make_unique<FloatAccessor>(bufferView, jAccessor.type, byteOffset, jAccessor.count));
else if (jAccessor.componentType == JsonAccessorComponentType::UNSIGNED_BYTE)
m_accessors.emplace_back(std::make_unique<UnsignedByteAccessor>(bufferView, jAccessor.type, jAccessor.count));
m_accessors.emplace_back(std::make_unique<UnsignedByteAccessor>(bufferView, jAccessor.type, byteOffset, jAccessor.count));
else if (jAccessor.componentType == JsonAccessorComponentType::UNSIGNED_SHORT)
m_accessors.emplace_back(std::make_unique<UnsignedShortAccessor>(bufferView, jAccessor.type, jAccessor.count));
m_accessors.emplace_back(std::make_unique<UnsignedShortAccessor>(bufferView, jAccessor.type, byteOffset, jAccessor.count));
else
throw GltfLoadException(std::format("Accessor has unsupported component type {}", static_cast<unsigned>(jAccessor.componentType)));
}

35
src/ObjLoading/XModel/Gltf/Internal/GltfAccessor.cpp
View File

@ -81,9 +81,10 @@ size_t NullAccessor::GetCount() const
return m_count;
}
FloatAccessor::FloatAccessor(const BufferView* bufferView, const JsonAccessorType type, const size_t count)
FloatAccessor::FloatAccessor(const BufferView* bufferView, const JsonAccessorType type, size_t byteOffset, const size_t count)
: m_buffer_view(bufferView),
m_type(type),
m_byte_offset(byteOffset),
m_count(count)
{
}
@ -109,7 +110,7 @@ bool FloatAccessor::GetFloatVec2(const size_t index, float (&out)[2]) const
if (index >= m_count)
return false;
return m_buffer_view->ReadElement(&out, index, sizeof(float[2]));
return m_buffer_view->ReadElement(&out, index, sizeof(float[2]), m_byte_offset);
}
bool FloatAccessor::GetFloatVec3(const size_t index, float (&out)[3]) const
@ -118,7 +119,7 @@ bool FloatAccessor::GetFloatVec3(const size_t index, float (&out)[3]) const
if (index >= m_count)
return false;
return m_buffer_view->ReadElement(&out, index, sizeof(float[3]));
return m_buffer_view->ReadElement(&out, index, sizeof(float[3]), m_byte_offset);
}
bool FloatAccessor::GetFloatVec4(const size_t index, float (&out)[4]) const
@ -127,7 +128,7 @@ bool FloatAccessor::GetFloatVec4(const size_t index, float (&out)[4]) const
if (index >= m_count)
return false;
return m_buffer_view->ReadElement(&out, index, sizeof(float[4]));
return m_buffer_view->ReadElement(&out, index, sizeof(float[4]), m_byte_offset);
}
bool FloatAccessor::GetUnsigned(size_t index, unsigned& out) const
@ -140,9 +141,10 @@ bool FloatAccessor::GetUnsignedVec4(size_t index, unsigned (&out)[4]) const
return false;
}
UnsignedByteAccessor::UnsignedByteAccessor(const BufferView* bufferView, const JsonAccessorType type, const size_t count)
UnsignedByteAccessor::UnsignedByteAccessor(const BufferView* bufferView, const JsonAccessorType type, size_t byteOffset, const size_t count)
: m_buffer_view(bufferView),
m_type(type),
m_byte_offset(byteOffset),
m_count(count)
{
}
@ -169,7 +171,7 @@ bool UnsignedByteAccessor::GetFloatVec2(const size_t index, float (&out)[2]) con
return false;
uint8_t temp[2];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[2])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[2]), m_byte_offset))
return false;
// Return as normalized value between 0 and 1
@ -186,7 +188,7 @@ bool UnsignedByteAccessor::GetFloatVec3(const size_t index, float (&out)[3]) con
return false;
uint8_t temp[3];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[3])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[3]), m_byte_offset))
return false;
// Return as normalized value between 0 and 1
@ -204,7 +206,7 @@ bool UnsignedByteAccessor::GetFloatVec4(const size_t index, float (&out)[4]) con
return false;
uint8_t temp[4];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[4])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[4]), m_byte_offset))
return false;
// Return as normalized value between 0 and 1
@ -222,7 +224,7 @@ bool UnsignedByteAccessor::GetUnsigned(const size_t index, unsigned& out) const
return false;
uint8_t temp;
if (!m_buffer_view->ReadElement(&temp, index, sizeof(uint8_t)))
if (!m_buffer_view->ReadElement(&temp, index, sizeof(uint8_t), m_byte_offset))
return false;
out = temp;
@ -236,7 +238,7 @@ bool UnsignedByteAccessor::GetUnsignedVec4(const size_t index, unsigned (&out)[4
return false;
uint8_t temp[4];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[4])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[4]), m_byte_offset))
return false;
out[0] = static_cast<unsigned>(temp[0]);
@ -247,9 +249,10 @@ bool UnsignedByteAccessor::GetUnsignedVec4(const size_t index, unsigned (&out)[4
return true;
}
UnsignedShortAccessor::UnsignedShortAccessor(const BufferView* bufferView, const JsonAccessorType type, const size_t count)
UnsignedShortAccessor::UnsignedShortAccessor(const BufferView* bufferView, const JsonAccessorType type, size_t byteOffset, const size_t count)
: m_buffer_view(bufferView),
m_type(type),
m_byte_offset(byteOffset),
m_count(count)
{
}
@ -276,7 +279,7 @@ bool UnsignedShortAccessor::GetFloatVec2(const size_t index, float (&out)[2]) co
return false;
uint16_t temp[2];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint16_t[2])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint16_t[2]), m_byte_offset))
return false;
// Return as normalized value between 0 and 1
@ -293,7 +296,7 @@ bool UnsignedShortAccessor::GetFloatVec3(const size_t index, float (&out)[3]) co
return false;
uint16_t temp[3];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint16_t[3])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint16_t[3]), m_byte_offset))
return false;
// Return as normalized value between 0 and 1
@ -311,7 +314,7 @@ bool UnsignedShortAccessor::GetFloatVec4(const size_t index, float (&out)[4]) co
return false;
uint16_t temp[4];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint16_t[4])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint16_t[4]), m_byte_offset))
return false;
// Return as normalized value between 0 and 1
@ -329,7 +332,7 @@ bool UnsignedShortAccessor::GetUnsigned(const size_t index, unsigned& out) const
return false;
uint16_t temp;
if (!m_buffer_view->ReadElement(&temp, index, sizeof(uint16_t)))
if (!m_buffer_view->ReadElement(&temp, index, sizeof(uint16_t), m_byte_offset))
return false;
out = temp;
@ -343,7 +346,7 @@ bool UnsignedShortAccessor::GetUnsignedVec4(const size_t index, unsigned (&out)[
return false;
uint16_t temp[4];
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[4])))
if (!m_buffer_view->ReadElement(temp, index, sizeof(uint8_t[4]), m_byte_offset))
return false;
out[0] = static_cast<unsigned>(temp[0]);

9
src/ObjLoading/XModel/Gltf/Internal/GltfAccessor.h
View File

@ -49,7 +49,7 @@ namespace gltf
class FloatAccessor final : public Accessor
{
public:
FloatAccessor(const BufferView* bufferView, JsonAccessorType type, size_t count);
FloatAccessor(const BufferView* bufferView, JsonAccessorType type, size_t byteOffset, size_t count);
[[nodiscard]] std::optional<JsonAccessorType> GetType() const override;
[[nodiscard]] std::optional<JsonAccessorComponentType> GetComponentType() const override;
@ -64,13 +64,14 @@ namespace gltf
private:
const BufferView* m_buffer_view;
JsonAccessorType m_type;
size_t m_byte_offset;
size_t m_count;
};
class UnsignedByteAccessor final : public Accessor
{
public:
UnsignedByteAccessor(const BufferView* bufferView, JsonAccessorType type, size_t count);
UnsignedByteAccessor(const BufferView* bufferView, JsonAccessorType type, size_t byteOffset, size_t count);
[[nodiscard]] std::optional<JsonAccessorType> GetType() const override;
[[nodiscard]] std::optional<JsonAccessorComponentType> GetComponentType() const override;
@ -85,13 +86,14 @@ namespace gltf
private:
const BufferView* m_buffer_view;
JsonAccessorType m_type;
size_t m_byte_offset;
size_t m_count;
};
class UnsignedShortAccessor final : public Accessor
{
public:
UnsignedShortAccessor(const BufferView* bufferView, JsonAccessorType type, size_t count);
UnsignedShortAccessor(const BufferView* bufferView, JsonAccessorType type, size_t byteOffset, size_t count);
[[nodiscard]] std::optional<JsonAccessorType> GetType() const override;
[[nodiscard]] std::optional<JsonAccessorComponentType> GetComponentType() const override;
@ -106,6 +108,7 @@ namespace gltf
private:
const BufferView* m_buffer_view;
JsonAccessorType m_type;
size_t m_byte_offset;
size_t m_count;
};
} // namespace gltf

6
src/ObjLoading/XModel/Gltf/Internal/GltfBufferView.cpp
View File

@ -10,10 +10,10 @@ BufferView::BufferView(const Buffer* buffer, const size_t offset, const size_t l
{
}
bool BufferView::ReadElement(void* dest, const size_t elementIndex, const size_t elementSize) const
bool BufferView::ReadElement(void* dest, const size_t elementIndex, const size_t elementSize, const size_t elementOffset) const
{
const auto stride = std::max(elementSize, m_stride);
const auto bufferViewOffset = elementIndex * stride;
const auto stride = std::max(elementOffset + elementSize, m_stride);
const auto bufferViewOffset = elementOffset + elementIndex * stride;
if (bufferViewOffset + elementSize > m_length)
return false;

2
src/ObjLoading/XModel/Gltf/Internal/GltfBufferView.h
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@ -8,7 +8,7 @@ namespace gltf
public:
BufferView(const Buffer* buffer, size_t offset, size_t length, size_t stride);
bool ReadElement(void* dest, size_t elementIndex, size_t elementSize) const;
bool ReadElement(void* dest, size_t elementIndex, size_t elementSize, size_t elementOffset) const;
private:
const Buffer* m_buffer;