#include "Buffer.hpp"

Buffer::~Buffer()
{
    release();
}

void Buffer::create()
{
    glGenBuffers(1, &m_buffer);
}

void Buffer::release()
{
    glDeleteBuffers(1, &m_buffer);
}

void Buffer::set(void const *data, size_t count, size_t size)
{
    bind();
    glBufferData(GL_SHADER_STORAGE_BUFFER, count * size, data, GL_STATIC_DRAW);
    unbind();
}

void Buffer::unbind()
{
    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
}

void Buffer::bind()
{
    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_buffer);
}

void Buffer::bindBase(GLint program, char const *name, int binding)
{
    bind();
    GLuint block_index = glGetProgramResourceIndex(program, GL_SHADER_STORAGE_BLOCK, name);
    if(block_index == GL_INVALID_INDEX){
        std::cout << "bindBase failed" << std::endl;
    }
    glShaderStorageBlockBinding(program, block_index, binding);
    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, binding, m_buffer);
    unbind();
}

void Buffer::get(void *data, size_t count, size_t size)
{
    bind();
    glGetBufferSubData(GL_SHADER_STORAGE_BUFFER, 0, count * size, data);
    unbind();
}