47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
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#pragma once
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#include "CesiumGltf/PropertyType.h"
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#include <CesiumUtility/Assert.h>
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#include <CesiumUtility/SpanHelper.h>
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#include <cstddef>
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#include <span>
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namespace CesiumGltf {
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static size_t getOffsetFromOffsetsBuffer(
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size_t index,
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const std::span<const std::byte>& offsetBuffer,
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PropertyComponentType offsetType) noexcept {
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switch (offsetType) {
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case PropertyComponentType::Uint8: {
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CESIUM_ASSERT(index < offsetBuffer.size() / sizeof(uint8_t));
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const uint8_t offset = *reinterpret_cast<const uint8_t*>(
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offsetBuffer.data() + index * sizeof(uint8_t));
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return static_cast<size_t>(offset);
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}
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case PropertyComponentType::Uint16: {
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CESIUM_ASSERT(index < offsetBuffer.size() / sizeof(uint16_t));
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const uint16_t offset = *reinterpret_cast<const uint16_t*>(
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offsetBuffer.data() + index * sizeof(uint16_t));
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return static_cast<size_t>(offset);
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}
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case PropertyComponentType::Uint32: {
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CESIUM_ASSERT(index < offsetBuffer.size() / sizeof(uint32_t));
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const uint32_t offset = *reinterpret_cast<const uint32_t*>(
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offsetBuffer.data() + index * sizeof(uint32_t));
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return static_cast<size_t>(offset);
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}
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case PropertyComponentType::Uint64: {
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CESIUM_ASSERT(index < offsetBuffer.size() / sizeof(uint64_t));
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const uint64_t offset = *reinterpret_cast<const uint64_t*>(
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offsetBuffer.data() + index * sizeof(uint64_t));
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return static_cast<size_t>(offset);
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}
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default:
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CESIUM_ASSERT(false && "Offset type is invalid");
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return 0;
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}
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}
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} // namespace CesiumGltf
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