75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
/*
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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 type T ordered based on if ENDIAN_FLIP is defined or not
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*/
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template<typename T>
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inline static std::vector<unsigned char> getBytes(T t) {
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std::vector<unsigned char> bytes;
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auto* asBytes = reinterpret_cast<unsigned char*>(&t);
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#ifdef ENDIAN_FLIP
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for (int i = 0; i < sizeof(T); i++)
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bytes.push_back(asBytes[i]);
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#else
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for (int i = 0; i < sizeof(T); i++)
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bytes.push_back(asBytes[sizeof(T) - 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
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* Converts the vector to single floating point format.
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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 = getBytes((float) vec.x());
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auto y = getBytes((float) vec.y());
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auto z = getBytes((float) vec.z());
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// we don't really use the w vector but this is a TODO
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//auto w = getBytes((float) 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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* Note: this is used for the GPU.
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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 integer the int to write
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*/
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template<typename T>
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inline static void writeBytes(unsigned char* array, size_t& offset, const T t) {
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auto x = getBytes(t);
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for (auto b: x)
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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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