InstanceBuffer.cpp

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#include <glad/glad.h>
 
#include "InstanceBuffer.hpp"
 
namespace galaxy
{
    namespace graphics
    {
 
        InstanceBuffer::InstanceBuffer()
            : m_id {0}
            , m_amount {0}
        {
            glCreateBuffers(1, &m_id);
        }
 
        InstanceBuffer::InstanceBuffer(InstanceBuffer&& i)
        {
            this->m_id     = i.m_id;
            this->m_amount = i.m_amount;
 
            i.m_id = 0;
        }
 
        InstanceBuffer& InstanceBuffer::operator=(InstanceBuffer&& i)
        {
            if (this != &i)
            {
                this->m_id     = i.m_id;
                this->m_amount = i.m_amount;
 
                i.m_id = 0;
            }
 
            return *this;
        }
 
        InstanceBuffer::~InstanceBuffer()
        {
            if (m_id != 0)
            {
                glDeleteBuffers(1, &m_id);
            }
        }
 
        void InstanceBuffer::buffer(std::span<glm::mat4> transforms)
        {
            m_amount = static_cast<int>(transforms.size());
            glNamedBufferData(m_id, transforms.size_bytes(), transforms.data(), GL_DYNAMIC_DRAW);
        }
 
        void InstanceBuffer::sub_buffer(const unsigned int index, std::span<glm::mat4> transforms)
        {
            glNamedBufferSubData(m_id, index * sizeof(glm::mat4), transforms.size_bytes(), transforms.data());
        }
 
        void InstanceBuffer::clear()
        {
            glNamedBufferData(m_id, m_amount * sizeof(glm::mat4), nullptr, GL_DYNAMIC_DRAW);
        }
 
        int InstanceBuffer::amount() const
        {
            return m_amount;
        }
 
        unsigned int InstanceBuffer::id() const
        {
            return m_id;
        }
    } // namespace graphics
} // namespace galaxy