OpenGL MSAA多采样中的蒙版（stencil）使用

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在OpenGL中进行MSAA多采样时，需要进行如下设置FBO

glGenFramebuffers(1, &mfbo);glBindFramebuffer(GL_FRAMEBUFFER, mfbo);//create color render bufferglGenRenderbuffers(1, &colorBuffer);glBindRenderbuffer(GL_RENDERBUFFER, colorBuffer);glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4 /* 4 samples */, GL_RGBA8, width, height);glBindRenderbuffer(GL_RENDERBUFFER, 0);glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorBuffer);// multi sampled depth bufferglGenRenderbuffers(1, &depthBuffer);glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4 /* 4 samples */, GL_RGBA8, width, height);glBindRenderbuffer(GL_RENDERBUFFER, 0);glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);GLenum result = glCheckFramebufferStatus(GL_FRAMEBUFFER);if (result == GL_FRAMEBUFFER_COMPLETE) {isMultiFBODone = true;}else {isMultiFBODone = false;}glBindFramebuffer(GL_FRAMEBUFFER, 0);

如果程序中还需要使用蒙版缓冲（stencil buffer），则需要将此FBO设置为如下格式：

glGenFramebuffers(1, &mfbo);glBindFramebuffer(GL_FRAMEBUFFER, mfbo);//create color render bufferglGenRenderbuffers(1, &colorBuffer);glBindRenderbuffer(GL_RENDERBUFFER, colorBuffer);glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4 /* 4 samples */, GL_RGBA8, width, height);glBindRenderbuffer(GL_RENDERBUFFER, 0);glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorBuffer);// multi sampled depth bufferglGenRenderbuffers(1, &depthBuffer);glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);glRenderbufferStorageMultisample(GL_RENDERBUFFER, 4 /* 4 samples */, GL_DEPTH24_STENCIL8, width, height);glBindRenderbuffer(GL_RENDERBUFFER, 0);glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, depthBuffer);GLenum result = glCheckFramebufferStatus(GL_FRAMEBUFFER);if (result == GL_FRAMEBUFFER_COMPLETE) {isMultiFBODone = true;}else {isMultiFBODone = false;}glBindFramebuffer(GL_FRAMEBUFFER, 0);

然后在根据需要写关于蒙版的代码即可

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