glDrawArrays()在Mac OS X上表现异常 [英] glDrawArrays() behaving weirdly on Mac OS X

问题描述

我正在使用Java和LWJGL练习在OpenGL中使用VBO(使用本教程，并基本上复制了它的代码:

I am practicing the usage of VBOs in OpenGL with Java and LWJGL (using this tutorial, and basically copying it's code: http://www.arcsynthesis.org/gltut/index.html) and right now something really weird is happening.

我设置了一个窗口，这是我的render()函数，在主循环内调用:

I have a window set up and this is my render() function, called inside the main loop:

public void render() {

    FloatBuffer buffer = BufferUtils.createFloatBuffer(3 * 3);

    buffer.put(-1);
    buffer.put(-1);
    buffer.put(0);

    buffer.put(0);
    buffer.put(1);
    buffer.put(0);

    buffer.put(1);
    buffer.put(-1);
    buffer.put(0);

    buffer.flip();

    int vbo = glGenBuffers();

    glBindBuffer(GL_ARRAY_BUFFER, vbo);
    glBufferData(GL_ARRAY_BUFFER, buffer, GL_STATIC_DRAW);

    glEnableVertexAttribArray(0);

    glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * 4, 0);

    glDrawArrays(GL_TRIANGLES, 0, 3);

    glDisableVertexAttribArray(0);

}

如您所见，这是一个非常简单的代码，应该绘制一个三角形.但是我在运行Intel HD 4000图形的Mac OS X Mountain Lion笔记本电脑上得到的是:

As you can see, it's very simple code which should draw a triangle. But what I get on a Mac OS X Mountain Lion laptop, running Intel HD 4000 graphics is this:

在运行AMD HD 6850显卡的Windows 7上，我得到的是:

And what I get on Windows 7, running AMD HD 6850 graphics is this:

那是为什么?我真的没有理由发生这种情况，两个显卡都支持我正在使用的OpenGL 2.0，对吧?

Why is that? I really see no reason for this to happen, both of the video cards support OpenGL 2.0, which is what I'm using, right?

推荐答案

当我第一次开始使用VAO对象时，我花了很多时间来解决这个问题.至少可以说这是非常令人沮丧的.

I devoted a lot of time to solving this issue when I first started to use VAO objects. It was very frustrating to say the least.

我最终弄清楚了，我想这归结为兼容性配置文件中的一个小问题，该问题要求您在调用glGenVertexArrays之前先在着色器上使用glLinkProgram和glUseProgram，即使该程序要求应该已经在Core之外放宽了.个人资料...

I ultimately figured it out and I guess it comes down to a glitch in the compatibility profile that requires you to have used glLinkProgram and glUseProgram on a shader prior to calling glGenVertexArrays, even though the program requirement should have been relaxed outside the Core profile...

最简单的解决方案是简单地替换:

The easiest solution is to simply replace:

GL30.glGenVertexArrays与APPLEVertexArrayObject.glGenVertexArraysAPPLE GL30.glBindVertexArray和APPLEVertexArrayObject.glBindVertexArrayAPPLE GL30.glDeleteVertexArrays与APPLEVertexArrayObject.glDeleteVertexArrayAPPLE

您还可以通过编译着色器并在使用GL30.glGenVertexArrays ...

You can also overcome the problem by compiling a shader and calling glUseProgram prior to using GL30.glGenVertexArrays ...

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