framebuffer Questions

4

Solved

I am rendering to a texture through a framebuffer object, and when I draw transparent primitives, the primitives are blended properly with other primitives drawn in that single draw step, but they ...
Argolis asked 31/1, 2010 at 8:50

4

Solved

I'm running Embedded Linux on an evaluation kit (Zoom OMAP35x Torpedo Development Kit). The board has an LCD and I would like to be able to take screen shots convert them into a gif or png. I can g...
Boxer asked 29/10, 2009 at 17:3

4

Solved

How to write directly to linux framebuffer?
Detest asked 6/10, 2009 at 17:43

3

There exist a class of applications that use opengl to provide hardware acceleration, but are not GUI based. However it seems that in the default case, to use opengl, there must be running an X-ser...
Charinile asked 22/8, 2011 at 22:27

1

I would like to recreate the programs shown in this article on a Mac. Is this possible? My research so far has pointed to "no" but I don't want to give up just yet. Python is preferred but my purpo...
Kanal asked 12/5, 2018 at 4:6

1

I am using the Linux framebuffer in my application, and setting ioctl(tty0_fd, KDSETMODE, KD_GRAPHICS) to prevent any cursor or text from being displayed by the underlying terminal, and then cleani...
Oleic asked 16/8, 2016 at 15:12

2

If I am copying pixels from one FBO to another and each of them have multiple (not necessary the same number) of color attachments, and if my mask is GL_COLOR_BUFFER_BIT, which color attachments (G...
Oversexed asked 17/7, 2013 at 5:20

2

Solved

The official XCB documentation tells us that using OpenGL purely with XCB is impossible: one must also use Xlib. This post by Bart Massey (creator of XCB) doesn't suggest this should be impossible...
Sheepherder asked 9/12, 2016 at 21:16

2

Solved

Is there a way to draw an overlay window always on top of any android application? I am using Android x86 port and have system rights. @Edit: The view below the overlay should receive all events....
Massorete asked 12/11, 2012 at 15:5

3

Solved

I want to use glClear and glClearColor to fill a frame buffer with a colour including alpha transparency. However the framebuffer always renders as opaque when binded to a texture which is rendered...
Esparza asked 21/1, 2010 at 20:48

1

Solved

I want to use a framebuffer to create an image using a shader program. This works well, except that the Y is inverted. It seems that the bottom left corner becomes the top left corner. Why does thi...
Upheld asked 6/5, 2019 at 16:58

1

I'm now studying what is the mechanism behind Ctrl+Alt+F1~F7. I found some infomation talk about framebuffer, VT, and tty. I know framebuffer is an anstraction to graphic card manipulation and tty(...
Kwangchow asked 5/2, 2018 at 16:42

2

Solved

I want to create an image in PILLOW and show it on the display on a Raspberry Pi. Until now I have saved the image and have used omxiv to show the image. This is rather time consuming. from PIL imp...
Drinker asked 8/11, 2019 at 19:48

1

I am trying to directly access video memory for a framebuffer video device on a Raspberry Pi using C# code running via Mono. I have a C program that works fine, but when I port it to C# it consiste...
Legalese asked 6/9, 2019 at 22:29

1

I'm hoping to develop some code that uses SDL2 to display graphics on the 7" RPi touchscreen, but I'd rather not install a full desktop OS. I've got Raspbian Buster Lite installed. Some simple...
Odel asked 27/8, 2019 at 10:20

2

I found the following code which was designed to draw a square on screen. #include <stdlib.h> #include <unistd.h> #include <stdio.h> #include <fcntl.h> #include <li...
Suffruticose asked 18/8, 2015 at 20:44

7

Solved

I was recently struck by a curious idea to take input from /dev/urandom, convert relevant characters to random integers, and use those integers as the rgb/x-y values for pixels to paint onto the sc...
Thuggee asked 14/2, 2011 at 20:12

1

I am wondering how to properly double buffer the framebuffer to avoid tearing. I've done lots of research on this topic and I can't seem to find anything. I've tried FBIO_WAITFORVSYNC. But per thi...
Lacerta asked 4/4, 2018 at 17:33

1

Solved

I am reading the red book OpenGL programming guide when I come across these two methods, which strikes me as unnecessary since we already can specify which color buffer the output is going to go to...
Mahmoud asked 25/6, 2018 at 18:51

3

Solved

I'm developing an iOS openGL ES application. I'm doing the usual EAGLView / ES2Render stuff. On startup, frambuffer creation succeeds, using the following code: - (BOOL) createFramebuffers { [E...
Forrest asked 20/8, 2013 at 3:39

2

Solved

I'm making a game in C that works on the linux framebuffer. So far I have a red 100x100 square that moves in tandem with the mouse, just like a pointer. I have implemented double buffering and it w...
Fitzger asked 16/12, 2012 at 14:10

2

I'm trying to make an application for linux that writes directly to the framebuffer /dev/fb0. In order to make it double buffered I try to make the virtual screen be double the size of the screen. ...
Cowie asked 25/2, 2013 at 16:26

0

Background: I have a pipeline that uses a series of OpenGL shaders to processes webcam source footage and locate a feature (it's always the same feature and there is only one feature that I am eve...
Walther asked 1/3, 2018 at 4:52

1

Solved

My task: Calculate the pixel coordinates (e.g. make a snapshot) of a 3D mesh to find the 2D shape of this mesh from a specific camera angle. I'm currently using Qt3D with a QGeometryRenderer to re...
Kissel asked 11/1, 2018 at 12:27

3

I want to get RGB values of screen pixels in the most efficient way, using Linux. So I decided to use the framebuffer library in C (fb.h) to access the framebuffer device (/dev/fb0) and read from i...
Crossgrained asked 21/10, 2017 at 18:42

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