我一直在尝试将我的一些代码转换为现代 OpenGL。我已经达到了没有任何 OpenGL 错误的地步，但是当我尝试绘制对象时没有任何显示。这是我的代码（减去上下文创建和错误检查）：
//Compile shaders and create/link program
//I very highly doubt the problem's here (all my tests say it worked fine),
//so I'm leaving this out for now, but I'll dig it out of my classes if
//there's no obvious problem with the VBO code.
//Create VAO, VBO
unsigned vaoId, vboId;
int positionAttributeLocation;
float vertices[] = {...vertex data here...};
unsigned indices[] = {...index data here...};
positionAttributeLocation = glGetAttribLocation(programId, "position");
glGenVertexArrays(1, &vaoId);
glGenBuffers(1, &vboId);
glBindVertexArray(vaoId);
glBindBuffer(GL_ARRAY_BUFFER, vboId);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glVertexAttribPointer(positionAttributeLocation, 3, GL_FLOAT, GL_FALSE, 0, null);
glEnableVertexAttribArray(positionAttributeLocation);
//Create index buffer
unsigned indexId;
glGenBuffers(1, &indexId);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glUseProgram(programId);
glDrawElements(GL_TRIANGLES, sizeof(indices)/sizeof(unsigned int), GL_UNSIGNED_INT, null);
不完全是 SSCCE，但我认为这就是所有可能导致问题的代码，而且它几乎是独立的。