light.cpp

#include "light.h"

Light::Light(){
  core = QOpenGLContext::currentContext()->versionFunctions<QOpenGLFunctions_3_3_Core>();
}

Light::~Light(){
  core->glDeleteBuffers(1, &lightVBO);
}

void Light::init(){

  float lightVertices[] = {
      // positions          // normals           // texture coords
      -0.5f, -0.5f, -0.5f,
       0.5f, -0.5f, -0.5f,
       0.5f,  0.5f, -0.5f,
       0.5f,  0.5f, -0.5f,
      -0.5f,  0.5f, -0.5f,
      -0.5f, -0.5f, -0.5f,

      -0.5f, -0.5f,  0.5f,
       0.5f, -0.5f,  0.5f,
       0.5f,  0.5f,  0.5f,
       0.5f,  0.5f,  0.5f,
      -0.5f,  0.5f,  0.5f,
      -0.5f, -0.5f,  0.5f,

      -0.5f,  0.5f,  0.5f,
      -0.5f,  0.5f, -0.5f,
      -0.5f, -0.5f, -0.5f,
      -0.5f, -0.5f, -0.5f,
      -0.5f, -0.5f,  0.5f,
      -0.5f,  0.5f,  0.5f,

       0.5f,  0.5f,  0.5f,
       0.5f,  0.5f, -0.5f,
       0.5f, -0.5f, -0.5f,
       0.5f, -0.5f, -0.5f,
       0.5f, -0.5f,  0.5f,
       0.5f,  0.5f,  0.5f,

      -0.5f, -0.5f, -0.5f,
       0.5f, -0.5f, -0.5f,
       0.5f, -0.5f,  0.5f,
       0.5f, -0.5f,  0.5f,
      -0.5f, -0.5f,  0.5f,
      -0.5f, -0.5f, -0.5f,

      -0.5f,  0.5f, -0.5f,
       0.5f,  0.5f, -0.5f,
       0.5f,  0.5f,  0.5f,
       0.5f,  0.5f,  0.5f,
      -0.5f,  0.5f,  0.5f,
      -0.5f,  0.5f, -0.5f
  };

  core->glGenBuffers(1, &lightVBO);

  core->glBindBuffer(GL_ARRAY_BUFFER, lightVBO);
  core->glBufferData(GL_ARRAY_BUFFER, sizeof(lightVertices), lightVertices, GL_STATIC_DRAW);
}

void Light::drawLight(){
  core->glEnableVertexAttribArray(0);
  core->glBindBuffer(GL_ARRAY_BUFFER, lightVBO);
  core->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);

  core->glDrawArrays(GL_TRIANGLES, 0, 36);
}