OpenGL Vertex Buffer Object not Showing - c++

Question

I have changed 3 GLFloat arrays (aka GLfloat[]) into vectors (aka vector) and my triangles stopped working! Here is my init function:
void initialize(GLuint &vao) {
// Use a Vertex Array Object
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
Projection = perspective(45.0f, 16.0f / 9.0f, 0.1f, 100.0f);
//ortho(-4.0f/3.0f, 4.0f/3.0f, -1.0f, 1.0f, -1.0f, 1.0f);
Model = translate(Model, vec3(0.f, 0.f, 0.f));
Model = rotate(Model, 45.0f, vec3(0.0f, 0.0f, 1.0f));
//pos + textures array
GLuint vboId;
glGenBuffers(1, &vboId);
glBindBuffer(GL_ARRAY_BUFFER, vboId);
glBufferData(GL_ARRAY_BUFFER, (vertices_position.size() + texture_coord.size() ) * sizeof(GLfloat), NULL, GL_DYNAMIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, vertices_position.size() * sizeof(GLfloat), &vertices_position[0]);
glBufferSubData(GL_ARRAY_BUFFER, vertices_position.size() * sizeof(GLfloat), texture_coord.size() * sizeof(GLfloat), &texture_coord[0]);
//Indices
GLuint eabId;
glGenBuffers(1, &eabId);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, eabId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLfloat), &indices[0], GL_DYNAMIC_DRAW);
//Textures
GLuint textureId;
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D, textureId);
load_image("../squirrel.jpg");
shaderProgram = create_program("../shaders/vert.shader", "../shaders/frag.shader");
//Position attribute
positionAttrId = glGetAttribLocation(shaderProgram, "position");
glVertexAttribPointer(positionAttrId, 3, GL_FLOAT, GL_FALSE, 0, 0);
glEnableVertexAttribArray(positionAttrId);
//Texture attribute
textureCoordId = glGetAttribLocation(shaderProgram, "texture_coord");
glVertexAttribPointer(textureCoordId, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid *)(vertices_position.size() * sizeof(GLfloat)));
glEnableVertexAttribArray(textureCoordId);
modelId = glGetUniformLocation(shaderProgram, "Model");
cameraId = glGetUniformLocation(shaderProgram, "Camera");
}
And below is my render function:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(shaderProgram);
glUniformMatrix4fv(modelId, 1, GL_FALSE, glm::value_ptr(Model));
glUniformMatrix4fv(cameraId, 1, GL_FALSE, glm::value_ptr(cam.matrix()));
//VAO
glBindVertexArray(vao);
//glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
glUseProgram(0);

Answer 1

You are using floating-point elements in your Index Buffer Object, that is not a valid data type.
OpenGL requires either GLubyte (not hardware accelerated on most desktop GPUs), GLushort or GLuint indices.
For best performance, you should use an array of GLushort and pass GL_UNSIGNED_SHORT as the element type in your call to glDrawElements (...).