ShaderBuffer.cpp

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#include "galaxy/logging/Log.hpp"
 
#include "ShaderBuffer.hpp"
 
namespace galaxy
{
    ShaderBuffer::ShaderBuffer()
        : m_id {0}
        , m_index {-1}
    {
        glCreateBuffers(1, &m_id);
    }
 
    ShaderBuffer::ShaderBuffer(const GLBufferBinding index)
        : m_id {0}
        , m_index {static_cast<int>(index)}
    {
        glCreateBuffers(1, &m_id);
    }
 
    ShaderBuffer::ShaderBuffer(ShaderBuffer&& s) noexcept
    {
        this->destroy();
 
        this->m_id    = s.m_id;
        this->m_index = s.m_index;
 
        s.m_id = 0;
    }
 
    ShaderBuffer& ShaderBuffer::operator=(ShaderBuffer&& s) noexcept
    {
        if (this != &s)
        {
            this->destroy();
 
            this->m_id    = s.m_id;
            this->m_index = s.m_index;
 
            s.m_id = 0;
        }
 
        return *this;
    }
 
    ShaderBuffer::~ShaderBuffer()
    {
        destroy();
    }
 
    void ShaderBuffer::set_index(const GLBufferBinding index)
    {
        m_index = static_cast<int>(index);
    }
 
    void ShaderBuffer::bind() const
    {
        if (m_index == -1)
        {
            GALAXY_LOG(GALAXY_FATAL, "Tried to bind SSBO with no index.");
        }
 
        glBindBufferBase(GL_SHADER_STORAGE_BUFFER, m_index, m_id);
    }
 
    void ShaderBuffer::unbind() const
    {
        glBindBufferBase(GL_SHADER_STORAGE_BUFFER, m_index, 0);
    }
 
    void ShaderBuffer::clear() const
    {
        auto size = 0;
 
        glGetNamedBufferParameteriv(m_id, GL_BUFFER_SIZE, &size);
        glNamedBufferData(m_id, size, nullptr, GL_DYNAMIC_DRAW);
    }
 
    void ShaderBuffer::destroy()
    {
        if (m_id != 0)
        {
            glDeleteBuffers(1, &m_id);
            m_id = 0;
        }
    }
 
    unsigned int ShaderBuffer::id() const noexcept
    {
        return m_id;
    }
} // namespace galaxy