cube-game-plus-plus/client/engine/shader/FramebufferRectangle.cpp

#include "client/engine/shader/FramebufferRectangle.h"
#include "client/engine/Wrapper.h"

FramebufferRectangle::FramebufferRectangle()
{
}

FramebufferRectangle::~FramebufferRectangle()
{
    glDeleteVertexArrays(1, &vba);
    glDeleteBuffers(1, &vbo);
}

bool FramebufferRectangle::init()
{
    glGenVertexArrays(1, &vba);
    glBindVertexArray(vba);
    
    glGenBuffers(1, &vbo);
    glBindBuffer(GL_ARRAY_BUFFER, vbo);

    glVertexAttribPointer(0, 2, GL_FLOAT, 0, sizeof(float) * 4, (GLvoid*) 0);
    glEnableVertexAttribArray(0);

    glVertexAttribPointer(2, 2, GL_FLOAT, 0, sizeof(float) * 4, (GLvoid*) (sizeof(float) * 2));
    glEnableVertexAttribArray(2);
    
    Engine::printError();
    
    float data[] = 
    {
        -1.0f, 1.0f, 0.0f, 1.0f, 
        -1.0f, -1.0f, 0.0f, 0.0f,
        1.0f, -1.0f, 1.0f, 0.0f,
        -1.0f, 1.0f, 0.0f, 1.0f,
        1.0f, -1.0f, 1.0f, 0.0f,
        1.0f, 1.0f, 1.0f, 1.0f
    };
    
    glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 24, data, GL_STATIC_DRAW);
    
    return true;
}

void FramebufferRectangle::draw()
{
    glBindVertexArray(vba);
    glBindBuffer(GL_ARRAY_BUFFER, vbo);
    glDrawArrays(GL_TRIANGLES, 0, 6);
}