我需要在 Qt5 项目中执行多重采样,但我不确定如何使用QOpenGLFrameBufferObject来执行 FSAA。就我搜索而言,没有关于如何执行此操作的示例,文档仅提到:“如果您想使用启用了多重采样的帧缓冲区对象作为纹理,您首先需要使用 QOpenGLContext 从它复制到常规帧缓冲区对象::blitFramebuffer()。” 我的代码目前如下所示:
//Enable FSAA for better output
int vp[4];
glGetIntegerv(GL_VIEWPORT, vp);
if(m_lpFBO == NULL)
{
//MultiSampling set to 4 now
QOpenGLFramebufferObjectFormat format;
format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
format.setMipmap(true);
format.setSamples(4);
format.setTextureTarget(GL_TEXTURE_2D);
format.setInternalTextureFormat(GL_RGBA32F_ARB);
//Create the FBO
m_lpFBO = new QOpenGLFramebufferObject(vp[2], vp[3], format);
m_lpFBOSurface = new QGLFramebufferObjectSurface(m_lpFBO);
}
QRect rc(0, 0, vp[2], vp[3]);
QGLSubsurface sub(lpPainter->currentSurface(), rc);
m_lpFBO->bind();
sub.setFramebufferObject(m_lpFBO);
lpPainter->pushSurface(&sub);
//Draw as usual
.
.
.
lpPainter->popSurface();
//Now Copy
QOpenGLFramebufferObject::blitFramebuffer(lpPainter->currentSurface()->framebufferObject(), rc, m_lpFBO, rc);