Excerpt from MeshRenderer.cpp from my 3D C++ game engine

MeshRenderer.cpp

//THIS is where aaalll the magic happens.
void MeshRenderer::render()
{
	ShaderProgram* shader = m_material->getShader();

	//Update the "modelMatrix" uniform
	string modelMatrixStr("modelMatrix");
	if (!shader->hasUniform(modelMatrixStr))
	{
		//throw BengineException("The compiled shader is missing uniform 'modelMatrix'.");
	}
	else
	{
		shader->setUniform(
			"modelMatrix",
			getGameObject()->getTransform()->toModelMatrix());
	}

	//Bind the material
	m_material->bind();

	//Bind the Vertex Array
	GLuint vao = m_mesh->getVAO();
	glBindVertexArray(vao);

	//DrawElements
	glDrawElements(
		GL_TRIANGLES,
		m_mesh->getIndices().size(),
		GL_UNSIGNED_INT,
		0);

	//Unbind the Vertex Array
	glBindVertexArray(0);
}