Buffer.hpp

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/*
   Copyright 2022 Rishi Challa
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
       http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
 
#pragma once
 
#ifdef KALE_OPENGL
 
#include <Kale/OpenGL/Utils/Utils.hpp>
 
#include <vector>
#include <array>
#include <algorithm>
 
#include <glad/glad.h>
 
namespace Kale::OpenGL {
 
    enum class BufferType : GLenum {
        ElementBuffer = GL_ELEMENT_ARRAY_BUFFER,
        VertexBuffer = GL_ARRAY_BUFFER,
        TextureBuffer = GL_TEXTURE_BUFFER
    };
 
    enum class BufferUsage : GLenum {
        Static = GL_STATIC_DRAW,
        Dynamic = GL_DYNAMIC_DRAW
    };
 
    template <typename T>
    class Buffer {
    private:
 
        unsigned int buffer;
 
        BufferType type;
        
    public:
 
        std::vector<T> data;
 
        void allocBuffer(BufferUsage usage) {
            bind();
            glBufferData(getEnumValue(type), sizeof(T) * data.size(), data.data(), getEnumValue(usage));
        }
 
        void updateBuffer() {
            bind();
            glBufferSubData(getEnumValue<BufferType>(type), 0, sizeof(T) * data.size(), data.data());
        }
 
        Buffer(BufferType type) : type(type) {
            glGenBuffers(1, &buffer);
            bind();
        }
 
        template <size_t N> Buffer(BufferType type, BufferUsage usage, const std::array<T, N>& data) : type(type),
            data(data.begin(), data.end()) {
            glGenBuffers(1, &buffer);
            allocBuffer(usage);
        }
 
        Buffer(BufferType type, BufferUsage usage, const std::vector<T>& dat) : type(type), data(dat) {
            glGenBuffers(1, &buffer);
            allocBuffer(usage);
        }
 
        Buffer(BufferType type, BufferUsage usage, std::vector<T>&& dat) : type(type), data(std::move(dat)) {
            glGenBuffers(1, &buffer);
            allocBuffer(usage);
        }
 
        Buffer(BufferType type, BufferUsage usage, const T* arr, size_t n) : type(type), data(arr, arr + n) {
            glGenBuffers(1, &buffer);
            allocBuffer(usage);
        }
 
        Buffer(const Buffer& other) = delete;
 
        void operator=(const Buffer& other) = delete;
 
        ~Buffer() {
            glDeleteBuffers(1, &buffer);
        }
 
        [[nodiscard]] size_t size() const {
            return data.size();
        }
 
        [[nodiscard]] const T& operator[](size_t i) const {
            return data[i];
        }
 
        [[nodiscard]] T& operator[](size_t i) {
            return data[i];
        }
 
        typename std::vector<T>::iterator begin() {
            return data.begin();
        }
 
        typename std::vector<T>::iterator end() {
            return data.end();
        }
 
        typename std::vector<T>::const_iterator cbegin() const {
            return data.cbegin();
        }
 
        typename std::vector<T>::const_iterator cend() const {
            return data.cend();
        }
 
        void bind() const {
            glBindBuffer(getEnumValue<BufferType>(type), buffer);
        }
 
        template <size_t N> void modify(size_t i, const std::array<T, N>& val) {
            std::copy(data.begin() + i, data.begin() + i + N, val.data());
            bind();
            glBufferSubData(getEnumValue<BufferType>(type), sizeof(T) * i, sizeof(T) * N, data.data());
        }
 
        void modify(size_t i, const std::vector<T>& val) {
            std::copy(data.begin() + i, data.begin() + i + val.size(), val.data());
            bind();
            glBufferSubData(getEnumValue<BufferType>(type), sizeof(T) * i, sizeof(T) * val.size(), data.data());
        }
 
        void modify(size_t i, const T* arr, size_t n) {
            std::copy(data.begin() + i, data.begin() + i + n, arr);
            bind();
            glBufferSubData(getEnumValue<BufferType>(type), sizeof(T) * i, sizeof(T) * n, data.data());
        }
 
        void modify(size_t i, T val) {
            data[i] = val;
            bind();
            glBufferSubData(getEnumValue<BufferType>(type), sizeof(T) * i, sizeof(T) * val.size(), data.data());
        }
 
        void resize(BufferUsage usage, size_t newSize) {
            data.resize(newSize);
            allocBuffer(usage);
        }
 
        template <size_t N> void resize(BufferUsage usage, const std::array<T, N>& arr) {
            data.resize(N);
            std::copy(data.begin(), data.end(), arr.data());
            allocBuffer(usage);
        }
 
        void resize(BufferUsage usage, const std::vector<T>& vec) {
            data = vec;
            allocBuffer(usage);
        }
 
        void resize(BufferUsage usage, std::vector<T>&& vec) {
            data = std::move(vec);
            allocBuffer(usage);
        }
 
        void resize(BufferUsage usage, const T* arr, size_t n) {
            data.clear();
            data.insert(data.begin(), arr, arr + n);
            allocBuffer(usage);
        }
 
    };
}
 
#endif