200 lines
6.3 KiB
C++
200 lines
6.3 KiB
C++
/*
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* <Short Description>
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* Copyright (C) 2023 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_WITH_GRAPHICS_MODEL_H
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#define BLT_WITH_GRAPHICS_MODEL_H
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#include <blt/math/vectors.h>
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#include <vector>
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#include <blt/gfx/gl_includes.h>
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#include <variant>
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#include <array>
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#include <blt/std/hashmap.h>
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namespace blt::gfx
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{
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struct vbo_t
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{
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GLuint bufferID_ = 0;
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GLsizeiptr size_ = 0;
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GLint buffer_type = 0;
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GLint memory_type = 0;
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void create(GLint type = GL_ARRAY_BUFFER);
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void bind() const;
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void unbind() const;
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void allocate(GLsizeiptr size, GLint mem_type = GL_STATIC_DRAW, const void* data = nullptr);
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template<typename T>
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void allocate(GLsizeiptr size, const T* data, GLint mem_type = GL_STATIC_DRAW)
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{
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allocate(size, mem_type, static_cast<const void*>(data));
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}
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void sub_update(GLsizeiptr offset, GLsizeiptr size, void* data);
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void update(GLsizeiptr size, void* data);
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void destroy();
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};
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struct vbo_t_owner
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{
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vbo_t vbo;
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vbo_t_owner() = default;
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explicit vbo_t_owner(vbo_t vbo): vbo(vbo)
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{}
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vbo_t* operator->(){
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return &vbo;
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}
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~vbo_t_owner()
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{
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if (!vbo.bufferID_)
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return;
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vbo.destroy();
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vbo.unbind();
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}
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};
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/**
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* Since most VAOs will not use more than 8 VBOs it makes no sense to heap allocate memory to store them
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* This class is used to make that easier to handle
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*/
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class static_dynamic_array
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{
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public:
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using vbo_type = std::shared_ptr<vbo_t_owner>;
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private:
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static constexpr size_t DATA_SIZE = 8;
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using array_t = std::array<vbo_type, DATA_SIZE>;
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std::variant<array_t, vbo_type*> data_;
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size_t size_ = DATA_SIZE;
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size_t max = 0;
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void swap();
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public:
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static_dynamic_array();
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static_dynamic_array(const static_dynamic_array& copy) = delete;
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static_dynamic_array(static_dynamic_array&& move) noexcept = default;
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static_dynamic_array& operator=(const static_dynamic_array& copy) = delete;
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static_dynamic_array& operator=(static_dynamic_array&& move) noexcept = default;
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vbo_type& operator[](size_t index);
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[[nodiscard]] inline size_t used() const noexcept
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{
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return max;
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}
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~static_dynamic_array()
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{
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if (std::holds_alternative<vbo_type*>(data_))
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delete[] std::get<vbo_type*>(data_);
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}
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};
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/**
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* basic VAO class.
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*/
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class vertex_array
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{
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private:
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GLuint vaoID;
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static_dynamic_array VBOs;
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HASHSET<GLuint> used_attributes;
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vbo_t element;
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void handle_vbo(const vbo_t& vbo, int attribute_number, int coordinate_size, GLenum type, int stride, long offset);
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public:
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vertex_array();
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vertex_array(const vertex_array&) = delete;
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vertex_array(vertex_array&&) = delete;
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vertex_array& operator=(const vertex_array&) = delete;
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vertex_array& operator=(vertex_array&&) = delete;
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/**
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* This function takes ownership of the underlying VBO (GPU side). It will be freed when the basic vertex array is deleted
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* @param vbo vbo to bind to this attribute
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* @param attribute_number attribute number to bind to
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* @param coordinate_size size of the data (number of
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* @param type type of data
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* @param stride how many bytes this data takes (for the entire per-vertex data structure) 0 will assume packed data
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* This is in effect how many bytes until the next block of data
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* @param offset offset into the data structure to where the data is stored
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* @return a shared pointer to the stored vbo. used for chaining VAOs with multiple shared VBOs
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*/
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static_dynamic_array::vbo_type bindVBO(const vbo_t& vbo, int attribute_number, int coordinate_size, GLenum type, int stride, long offset);
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// same as the other bind method except you provide the shared reference.
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void bindVBO(const static_dynamic_array::vbo_type& vbo, int attribute_number, int coordinate_size, GLenum type, int stride, long offset);
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inline void bindElement(const vbo_t& vbo)
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{
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bind();
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element = vbo;
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vbo.bind();
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unbind();
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}
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inline vbo_t& getElement()
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{
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return element;
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}
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/**
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* Returns a non-owning reference to a vbo allowing for updating the VBO
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* The VBO is considered invalid if its ID is 0
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*/
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inline vbo_t& operator[](size_t index)
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{
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return VBOs[index]->vbo;
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}
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inline void bind() const
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{
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glBindVertexArray(vaoID);
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}
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static inline void unbind()
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{
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glBindVertexArray(0);
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}
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~vertex_array();
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};
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}
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#endif //BLT_WITH_GRAPHICS_MODEL_H
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