60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
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/*
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* Created by Brett Terpstra 6920201 on 03/12/22.
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* Copyright (c) 2022 Brett Terpstra. All Rights Reserved.
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*/
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#ifndef STEP_3_MEMORY_UTIL_H
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#define STEP_3_MEMORY_UTIL_H
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#include <engine/util/std.h>
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#define ENDIAN_FLIP
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namespace Raytracing {
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class MemoryConvert {
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private:
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public:
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/**
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* returns the bytes from the double ordered based on if ENDIAN_FLIP is defined or not
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*/
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inline static std::vector<unsigned char> getDoubleBytes(double d) {
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std::vector<unsigned char> bytes;
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auto* doubleAsBytes = reinterpret_cast<unsigned char*>(&d);
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#ifdef ENDIAN_FLIP
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for (int i = 0; i < sizeof(double); i++)
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bytes.push_back(doubleAsBytes[i]);
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#else
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for (int i = 0; i < sizeof(double); i++)
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bytes.push_back(doubleAsBytes[sizeof(double) - i]);
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#endif
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return bytes;
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}
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/**
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* Note: this is used for the GPU and it is assumed that you are using double precision values.
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* Anything else is undefined. (Should be fine though since upcasting is fine)
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* @param array array to write into
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* @param offset offset of where to start writing into. Will update this value as it moves through the vector
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* @param vec the vector to write
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*/
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inline static void writeVectorBytes(unsigned char* array, size_t& offset, const Vec4& vec) {
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auto x = getDoubleBytes(vec.x());
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auto y = getDoubleBytes(vec.y());
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auto z = getDoubleBytes(vec.z());
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auto w = getDoubleBytes(vec.w());
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// write the bytes as a packed vector.
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for (auto b: x)
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array[offset++] = b;
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for (auto b: y)
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array[offset++] = b;
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for (auto b: z)
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array[offset++] = b;
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for (auto b: w)
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array[offset++] = b;
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}
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};
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}
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#endif //STEP_3_MEMORY_UTIL_H
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