[C++] [OpenGL] 帧缓冲_c++缓冲视频帧的代码-优快云博客

这篇博客介绍了如何在OpenGL中设置和使用帧缓冲对象（FBO）、渲染缓冲对象（RBO）以及纹理，以进行离屏渲染。作者通过代码展示了创建FBO、RBO和纹理的过程，并进行渲染操作，最终将结果绑定到纹理上。在渲染过程中，还涉及到深度测试和清除颜色缓冲区。虽然遇到了边框问题，但作者发现是由于没有开启混合导致的。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

代码

	GLuint fbo;
	GLuint rbo;
	GLuint texture;
	//获取帧缓冲对象
	glGenFramebuffers(1, &fbo);
	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
	//获取渲染缓冲对象
	glGenRenderbuffers(1, &rbo);
	glBindRenderbuffer(GL_RENDERBUFFER, rbo);
	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
	glBindRenderbuffer(GL_RENDERBUFFER, 0);
	//获取纹理，这个纹理就是最后的结果
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, nullptr);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glBindTexture(GL_TEXTURE_2D, 0);
	//绑定到帧缓冲
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rbo);
	//渲染到帧缓冲
	glEnable(GL_DEPTH_TEST);
	glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glm::vec3 position = glm::vec3(0.0f, 2.0f, 3.0f);
	data->camera.setPosition(position);
	data->camera.setFront(-position);
	data->program.useProgram();
	data->program.setUniform("u_projection", data->camera.getProjectionMatrix());
	data->program.setUniform("u_view", data->camera.getViewMatrix());
	data->program.setUniform("u_cameraposition", data->camera.getPosition());
	data->program.setUniform("u_enableUniformColor", true);
	data->program.setUniform("u_color", glm::vec4(0, 0, 1, 1));
	data->program.setUniform("u_enableLighting", true);
	data->model.render(data->program);
	//切换到默认帧缓冲（屏幕）
	glBindFramebuffer(GL_FRAMEBUFFER, 0);