I want to know the dimension of my default frame buffer. I read setting view port to a particular value does not affect/set the dimensions of frame buffer. Are there any GL calls for this?

I'm developing an OpenGL application and I need to find how many framebuffer color attachments are supported. Is there a way to query OpenGL for that value?

We are trying to figure out why we have a relatively slow FPS on iphone 4 and ipad 1. We are seeing this Category of warning in our open GL Analysis: Logical Buffer Load. The summary is "Slow frame...

I want to test some text drawing functions on a framebuffer device that is not connected to any physical display. Is there a way to view in real time what I'm drawing to /dev/fb0 ?

I need to display RAM-based framebuffer for a virtual GPU device that doesn't have real display connected to it. What I have is mmap'ed chunk of memory after DRM_IOCTL_MODE_MAP_DUMB in RGB32 format...

I'm working with OpenGL Frame Buffer Objects. I have created a Frame Buffer Object with 2 color textures and a depth texture. I'm using glBindFramebuffer(GL_READ_FRAMEBUFFER, ID); To bind my f...

The scenario I'm creating a frame buffer object and binding a texture to colour attachment 0. I'm not using a depth buffer. After creating it, I unbind it. At some point in time later, the frame ...

I'm trying to read pixels out of the screen buffer, I'm creating a CGImageRef with CGDisplayCreateImage, but the values for CGImageGetWidth and CGImageGetBytesPerRow Don't make sense together, divi...

I have a framebuffer to which I rendered my scene and now I want to render this to a "fullscreen" quad. How can I set my camera and what should I put in my vertex shader in order to render the fram...

I found a lot about /dev/graphics/fb0. It is fast. But It doesn't seems to be working. If i do manually. Neither programmatically. But I am sure that this feature works on my mobile as i have an ap...

I've been trying to add SSAO (based on the tutorial here: http://john-chapman-graphics.blogspot.co.nz/2013/01/ssao-tutorial.html) to a project of mine and I've gotten stuck on rendering the depth c...

I'm trying to get proper Z value from depth buffer (which is rendered to color texture and then read with glReadPixels) and then unproject for real 3D space coordinate. On iPad Air it works perfect...

I need a very fast way of displaying a data buffer to screen. I first tried accessing the linux framebuffer and that proved to be quite good. Then I learned about directFB and I liked the extra fea...

I would like to write an application for Android which displays stuff on screen using the framebuffer. This will run only on a specific rooted device, so permissions etc is not a problem. Same appl...

I am looking for code (any language) of a basic graphical list which can be reordered by drag and drop. So exactly this functionality http://jqueryui.com/sortable/ but written directly on the frame...

Is there a method to read the frame buffer of the current screen? I searched some data about the frame buffer. Some one used the glReadPixels method, but the information was not enough. Does anyone...

Is it possible to render totally offscreen in a QGLWidget with Qt without the need to repaint the scene to screen thus avoiding totally the buffers flip on monitor? I need to save every frame gene...

I am trying to make a small program to control the colour of an RGB LED according to the colour of certain pixels on the screen. Since this is on Raspberry Pi running Raspbmc, I cant use XLib beca...

I have to perform some task which need to access the screen data in the framebuffer of OS X. In 10.6.8 we can get the framebuffer base address by using Quart Display Service API, but we can not do ...

Can I have textures of different sizes attached to a single FBO, and then use those for multiple render targets? Will I need to do anything special with glViewport to make this happen? Suppose I ha...

When using UBOs, we bind a uniform block to a binding point. Then we also bind the UBO to the same binding point: something like: glUseProgram(ProgramName); glUniformBlockBinding(ProgramName, unif...

I'm teaching my son programming "the right/hard way", so we're starting with C, like real men :) Printing text to the console is fun, but I still remember the exhilaration of switching my old i38...

My device is Nexus 4 running Jelly Bean 4.2. I'm trying to record the screen and send it out. Most codes on internet do the cap by read /dev/graphics/fb0. It works fine in some devices and the olde...

I have frame buffer, with depth component and 4 color attachments with 4 textures I draw some stuff into it and unbind the buffer after, using 4 textures for fragment shader (deferred lighting). L...

I've been "hacking" one of my favorite games from when I was younger, and I've managed to be able to intercept OpenGL calls and inject C++ code using an opengl32.dll wrapper. I've been able to come...