英特尔和英伟达之间的 OpenGL fbo 传输不一致

我正在将OpenGL中低分辨率的场景渲染到帧缓冲器中。然后我打算将此版本绘制到整个屏幕上（GL_NEAREST放大）。我使用纹理传输（glBlitFramebuffer）来做到这一点。在我的Nvidia GPU上，这可以工作，但是当在我的Intel i7集成显卡上执行完全相同的代码时，目标帧缓冲器上的y位置似乎是错误的（即图像渲染得太远）。

glGetError 不返回任何错误。由于Nvidia驱动程序往往非常宽容，我希望我在OpenGL规范中遗漏了Nvidia不关心的小细节。我搜索了互联网和堆栈溢出，找不到类似的问题描述。两个驱动程序都报告支持 OpenGL 3.0

我的绘图代码：

//setup viewport for small image
glPushAttrib(GL_VIEWPORT_BIT);
glViewport(0, 0, image.getWidth(), image.getHeight());

//bind small framebuffer
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
glDrawBuffers(GL_COLOR_ATTACHMENT0);
glClear(GL_COLOR_BUFFER_BIT);

//draw
renderRotatedFull(1);//nothing interesting at all happening here

//reset Viewport
glPopAttrib();

//prepare and execute blitting
glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
glReadBuffer(GL_COLOR_ATTACHMENT0);

glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glDrawBuffers(GL_BACK_LEFT);

glBlitFramebuffer(0, 0, image.getWidth(), image.getHeight(), 0, 0, Game.width,
    Game.height, GL_COLOR_BUFFER_BIT, GL_NEAREST);

glBindFramebuffer(GL_FRAMEBUFFER, 0);

//throws exception if there is an OpenGL error
org.lwjgl.opengl.Util.checkGLError();

初始化按如下方式完成：

fbo =glGenFramebuffers();
glBindFramebuffer(GL_FRAMEBUFFER, fbo);

rbo = glGenRenderbuffers();
glBindRenderbuffer(GL_RENDERBUFFER, rbo);
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA8, image.getWidth(), image.getHeight());
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);

assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);