framebuffer

A presentable image starts out in VK_IMAGE_LAYOUT_UNDEFINED but will be VK_IMAGE_LAYOUT_PRESENT_SRC_KHR after they have been presented once. A lot of examples do a transition of all vkImages to VK_IMAGE_LAYOUT_PRESENT_SRC_KHR immediately after creating the vkSwapchain . Which allows them to use an VK_IMAGE_LAYOUT_PRESENT_SRC_KHR for oldLayout . But doing the transition right after creation of the swapchain is not allowed. Use of a presentable image must occur only after the image is returned by vkAcquireNextImageKHR , and before it is presented by vkQueuePresentKHR . This includes

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. This is the program I wrote: struct fb_var_screeninfo screeninfo_var; struct fb_fix_screeninfo screeninfo_fixed; unsigned int* screenbuffer; void gfx_init() { fb0 = open("/dev/fb0", O_RDWR); if(fb0 == 0) error("Could not open framebuffer located in /dev/fb0!"); if (ioctl(fb0, FBIOGET_FSCREENINFO, &screeninfo_fixed) == -1) error("Could not retrive fixed screen info!"); if (ioctl(fb0, FBIOGET

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 works correctly (the square doesn't flicker). The problem is, there is quite a lot of tearing happening horizontally. What I mean by that is, when the square moves on the x axis, it's like it is divided horizontally, and one part of it advances slithgly more than the other. This "rip" slowly propagates from top to bottom on the square if i keep moving it. I believe it happens because the hardware

On a Mac, I've got an OpenGL setup that is working just fine apart from framebuffers - texturing works, etc. So I know that texturing is enabled, I have a valid context, etc. All works flawlessly until I try to create a framebuffer. I created a framebuffer with glGenFramebuffers, glBindFramebuffer, and glFramebufferTexture2D, and glCheckFramebufferStatus is returning GL_FRAMEBUFFER_COMPLETE. If I then call glClear, followed by a call to glGetTexImage, the returned data shows that the glClear acted on the texture bound to the framebuffer just as it should. I can set glClearColor to anything I

I tried : process = Runtime.getRuntime().exec("su -c cat /dev/graphics/fb0 > /sdcard/frame.raw"); process.waitFor(); but it doesn't work. My device is rooted. I see many answers that it requires rooted access, but no actual code to get the framebuffer. I also tried glReadPixels() but no luck. public void TakeScreen() { DisplayMetrics dm = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); int width = dm.widthPixels; int height = dm.heightPixels; int screenshotSize = width * height; ByteBuffer bb = ByteBuffer.allocateDirect(screenshotSize * 4); bb.order(ByteOrder