framebuffer

i am new to this linux framebuffer so do anybody guide me to draw the line-graph in framebuffer. And i have the code to draw graph in turbo c but now in linux. So please help me out. Thank You, Rahul Use open() on the right file in /dev (eg. /dev/fb0 ), then use mmap() to map it into memory. Manpages will help for these syscalls if you do not know how to use them. Then there are some structures and constants for some ioctl() s in <linux/fb.h> . Like many kernel headers, you can learn a lot simply browsing the file. Particularly interesting is the ioctl FBIOGET_VSCREENINFO with struct fb_var

I'm confused about concept of Framebuffer and Renderbuffer. I know that they're required to render, but I want to understand them before use. I know some bitmap buffer is required to store the temporary drawing result. The back buffer. And the other buffer is required to be seen on screen when those drawings are in progress. The front buffer. And flip them, and draw again. I know this concept, but it's hard to connect those objects to this concept. What's the concept of and differences of them? This page has some details which I think explain the difference quite nicely. Firstly: The final

How to write directly to linux framebuffer? look at FBIOPUT_VSCREENINFO, ioctl and mmap (I have the code but not at this pc, sorry) edit: this should get you started //open file descriptor and get info inf fdScreen = open( "devicename", O_RDWR ); fb_var_screeninfo varInfo; ioctl( fdScreen, FBIOGET_VSCREENINFO, &varInfo ); //set resolution/dpi/color depth/.. in varInfo, then write it back ioctl( fdScreen, FBIOPUT_VSCREENINFO, &varInfo ); //get writable screen memory; unsigned short here for 16bit color unsigned short* display = mmap( 0, nScreenSize, PROT_READ | PROT_WRITE, MAP_SHARED, fdScreen,

Can I use Pixel Buffer Object (PBO) to directly read the pixels values (i.e. using glReadPixels) from the FBO (i.e. while FBO is still attached)? If yes, What are the advantages and disadvantages of using PBO with FBO? What is the problem with following code { //DATA_SIZE = WIDTH * HEIGHT * 3 (BECAUSE I AM USING 3 CHANNELS ONLY) // FBO and PBO status is good . . glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboId); //Draw the objects Following glReadPixels works fine glReadPixels(0, 0, screenWidth, screenHeight, GL_BGR_EXT, GL_UNSIGNED_BYTE, (uchar*)cvimg->imageData); Following glReadPixels DOES

How to OpenGL on Linux Platform Without X-Window System, can I send OpenGL Graphics Directly to Framebuffer Device? There Is Project Named DirectFB (Direct FrameBuffer). With DirectFB We can do this but DirectFB needs for driver for each hardware and I want to user a graphic card that only have Linux driver. This is how i did it in my ubuntu 11.04 in detail: 1- Install the dependencies using the command: sudo apt-get install xutils-dev libpciaccess-dev x11proto-dri2-dev x11proto-gl-dev libxdamage-dev libxfixes-dev 2- The mesa library needs libdrm version >= 2.4.24 which is not available in the

I am programming an Android 2d game using opengl es 2.0. After I draw my sprites to the backbuffer I draw lights to a FBO and try to blend it to the back buffer again. When I draw the FBO to the framebuffer, even trasparent without any color, the framerates drops from 60 to 30 on a Samsung Galaxy w (it has an adreno 205 as gpu). I searched everywhere and tried everything, even if I draw a single sprite on the scene and blend a trasparent FBO texture to the screen the framerate drops. I tried other games with lighting effects on that phone and they run fine, almost every game is fine on that