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最近我创建了一个新的OpenGL项目。我写了一个简单的应用程序，使用SDL 2，GLAD，应该画一个三角形，但没有工作。下面是我的代码：

/* Library headers */
#include "glad/glad.h"
#include "SDL2/SDL.h"

/* Standard headers */
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

/* User-defined headers*/
#include "defs.h"

/* Globals */
SDL_Window* g_window = NULL;
SDL_GLContext g_context = NULL;
bool g_quit = false;

/* OpenGL Objects */
GLuint g_vao, g_vbo, g_ebo;

const GLfloat vertices[] = {
     0.0f,  0.5f, 0.0f,
    -0.5f, -0.5f, 0.0f,
     0.5f, -0.5f, 0.0f
};

const GLuint indices[] = {
    0, 1, 2
};

bool init_sdl(void)
{
    /* Init SDL2 */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fprintf(stderr, "SDL2 couldn't initialize: %s\n", SDL_GetError());
        return false;
    }

    /* Set the attributes */
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, MAJOR_VERSION);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, MINOR_VERSION);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, OPENGL_PROFILE);

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, HAS_DOUBLEBUFFER);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, DEPTH_SIZE);

    /* Create the window */
    g_window = SDL_CreateWindow("SDL Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
        SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
    if (g_window == NULL) {
        fprintf(stderr, "SDL_Window couldn't be created: %s\n", SDL_GetError());
        return false;
    }

    g_context = SDL_GL_CreateContext(g_window);
    if (g_context == NULL)
    {
        fprintf(stderr, "SDL_GLContext couldn't be created: %s\n", SDL_GetError());
        return false;
    }

    if (!gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress)) {
        fprintf(stderr, "GLAD couldn't initialize!\n");
        return false;
    }

    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    glClearColor(0.0f, 0.4f, 0.4f, 0.0f);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);

    return true;
}

void handle_events(void)
{
    SDL_Event e;
    
    while (SDL_PollEvent(&e) != 0) {
        switch (e.type) {
        case SDL_QUIT:
            g_quit = true;
            break;
        case SDL_KEYDOWN:
            if (e.key.keysym.sym == SDLK_ESCAPE)
                g_quit = true;
        
        default:
            break;
        }
    }
}

void pre_render(void)
{
    glGenVertexArrays(1, &g_vao);
    glBindVertexArray(g_vao);

    glGenBuffers(1, &g_vbo);
    glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

    glGenBuffers(1, &g_ebo);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ebo);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (void*)0);
    glEnableVertexAttribArray(0);

    glBindVertexArray(0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
}

void render(void)
{
    glBindVertexArray(g_vao);
    glDrawElements(GL_TRIANGLES, sizeof(indices)/sizeof(indices[0]), GL_UNSIGNED_INT, NULL);
}

void cleanup(void)
{
    glDeleteVertexArrays(1, &g_vao);
    glDeleteBuffers(1, &g_vbo);
    glDeleteBuffers(1, &g_ebo);

    SDL_GL_DeleteContext(g_context);
    SDL_DestroyWindow(g_window);
    g_context = NULL;
    g_window  = NULL;
    SDL_Quit();
}

int main(int argc, char* argv[])
{
    if (!init_sdl())
        return EXIT_FAILURE;

    pre_render();

    while (!g_quit) {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        render();

        SDL_GL_SwapWindow(g_window);
        handle_events();
    }
    
    cleanup();
    return EXIT_SUCCESS;
}

我试图找到一些相关的主题，但我没有找到任何东西。如果你能帮我我会很感激的！
我的另一个项目用同样的代码工作得很好。（我有默认的着色器，所以一切都应该工作没有任何外部着色器）