framebuffer

问题 I read that in layered rendering, we create a 2D texture array (GL_TEXTURE_2D_ARRAY): glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D_ARRAY, TextureColorbufferName); glTexParameteri(.... glTexImage3D(... and can attach it to FBO: glGenFramebuffers(1, &FramebufferName); glBindFramebuffer(GL_FRAMEBUFFER, FramebufferName); glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, TextureColorbufferName, 0); What i find hard to understand visually is how can a layer of textures be

问题 Here is very simple code .. Only thing is I repeated same code manytimes for detail debug. Detail info: OpenGL version 3.3.0, Window 7 OS and VS2008, OpenCV 2.2.0. RenderObject(); //glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS); Mat image; image.create(screenHeight,screenWidth, CV_8UC3); glReadPixels(0, 0, screenWidth, screenHeight, GL_BGR, GL_UNSIGNED_BYTE, (uchar*)image.data); int error_code1 = glGetError(); // Error Code: 0, NO Error, Also output is good/as expected! glBindFramebufferEXT

问题 I'm currently developing a game engine/framework for a game I intend to develop. I'm designing the system to be as decoupled as possible via abstract classes and dependency injection. Ideally, I'm aiming for each sub-system to not depend on other parts of the engine. In my rendering system, I'd like to provide the ability to reset the viewport and scissor/clipping area to the size of the currently bound target for rendering (Be it an OpenGL FrameBuffer, Direct3D RenderTarget or the default

问题 I have two 2D textures. The first, an MSAA texture, uses a target of GL_TEXTURE_2D_MULTISAMPLE . The second, non MSAA texture, uses a target of GL_TEXTURE_2D . According to OpenGL's spec on ARB_texture_multisample, only GL_NEAREST is a valid filtering option when the MSAA texture is being drawn to. In this case, both of these textures are attached to GL_COLOR_ATTACHMENT0 via their individual Framebuffer objects. Their resolutions are also the same size (to my knowledge this is necessary when

问题 I'm working with someone else's code on a device which can put an image to /dev/fb/0 and show up on video out or send it over the network to a client application. I don't have access to the old source for the client app, but I know the following about the data: 720x480 16-bit RGB (I'm no sure if it's 5,5,5 or 5,6,5) RAW (no headers whatsoever) cat -able to /dev/fb/0 675kb How can I give this a header or convert it to JPEG, BMP, or a RAW type that I could then view in a desktop application?

问题 I'm working with someone else's code on a device which can put an image to /dev/fb/0 and show up on video out or send it over the network to a client application. I don't have access to the old source for the client app, but I know the following about the data: 720x480 16-bit RGB (I'm no sure if it's 5,5,5 or 5,6,5) RAW (no headers whatsoever) cat -able to /dev/fb/0 675kb How can I give this a header or convert it to JPEG, BMP, or a RAW type that I could then view in a desktop application?

问题 I'm writing a framebuffer for an SPI LCD display on ARM. Before I complete that, I've written a memory only driver and trialled it under Ubuntu (Intel, Virtualbox). The driver works fine - I've allocated a block of memory using kmalloc, page aligned it (it's page aligned anyway actually), and used the framebuffer system to create a /dev/fb1. I have my own mmap function if that's relevant (deferred_io ignores it and uses its own by the look of it). I have set: info->screen_base = (u8 __iomem *

问题 I'm trying to replace OpenGL's gl_FragDepth feature which is missing in OpenGL ES 2.0. I need a way to set the depth in the fragment shader, because setting it in the vertex shader is not accurate enough for my purpose. AFAIK the only way to do that is by having a render-to-texture framebuffer on which a first rendering pass is done. This depth texture stores the depth values for each pixel on the screen. Then, the depth texture is attached in the final rendering pass, so the final renderer

问题 I am using JOGL, but this question applies to OpenGL in general. There seem to be similar questions lying around, but they are either directed at GLSL code, have to do with copying the contents of a frame buffer, or are a general advice - use frame buffer objects instead of glCopyTexSubImage2D . Question I am doing some shadow mapping. How do I render the depth channel directly to a texture using a frame buffer object? Can you please post a block of code that initializes the texture and the

问题 I'd like to add a second render target to the default framebuffer of a QOpenGLWidget. The reason is that I'd like to implement object picking and check whether the user hit an object by rendering a segmentation mask into gl_FragData[1] . Unfortunately, you can only retrieve the GLuint handle from the widget and there is no constructor of QOpenGLFramebufferObject that takes in the handle and there is no other option to retrieve the framebuffer. Is there any possibility to attach another