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OpenGL MSAA多采样中的蒙版(stencil)使用

程序员文章站 2022-07-04 20:07:31
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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 buffer
		glGenRenderbuffers(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 buffer
		glGenRenderbuffers(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 buffer
		glGenRenderbuffers(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 buffer
		glGenRenderbuffers(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

相关标签: OpenGL