gistfile1.c

    // Create a VAO
    GLuint gridVAO;
    glGenVertexArrays(1, &gridVAO);
    glBindVertexArray(gridVAO);

    // Allocate and upload the VBO data
    GLuint gridVBO;
    glGenBuffers(1, &gridVBO);
    glBindBuffer(GL_ARRAY_BUFFER, gridVBO);
    glBufferData(GL_ARRAY_BUFFER, MAP_WIDTH * MAP_HEIGHT * sizeof(float) * 3, grid_vertices, GL_STATIC_DRAW);

    // We also need an IBO
    GLuint gridIBO;
    glGenBuffers(1, &gridIBO);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gridIBO);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, num_vertices * sizeof(GLushort), grid_indices, GL_STATIC_DRAW);

    glVertexAttribPointer(gridVAO, 3, GL_FLOAT, GL_FALSE, 0, NULL);