4 ms·

I'm not really sure what EGL is, but will Vulkan also run on top of EGL?

by skohan 5y ago

jabl 5y ago
Vulkan has WSI, which is roughly equivalent to GLX or EGL in the OpenGL world. https://github.com/KhronosGroup/Vulkan-Guide/blob/master/chapters/wsi.adoc https://github.com/KhronosGroup/Vulkan-Guide/blob/master/cha...
- account42 5y ago
  GLX and EGL have two roles, one is the WSI part, the other is context creation and device enumeration which Vulkan had the good sense to add to the core standard.
ZiiS 5y ago
No Vulkan dose not need/use EGL. It nativity talks to Wayland/X11.
johnvega 5y ago
"For most cases, you do all the actual rendering work in GL or GLES contexts, which you create with WGL, CGL, GLX, or EGL, depending on your platform. GL and GLES do the actual rendering. EGL and friends are basically just the glue layer to get things to the screen. (Well, to the window manager)" https://www.reddit.com/r/opengl/comments/11q0oz/what_is_the_difference_between_eglglxogl_and_gles/ https://www.reddit.com/r/opengl/comments/11q0oz/what_is_the_...
- matheusmoreira 5y ago
  > EGL and friends are basically just the glue layer to get things to the screen. (Well, to the window manager)" EGL can also be used directly with kernel mode setting and buffer management. No window managers necessary! A simple example I found: https://github.com/siro20/XlessEGL/blob/master/eglkms.c https://github.com/siro20/XlessEGL/blob/master/eglkms.c
  - account42 5y ago
    SDL2 actually supports KMS so a number of games can run without a display server without any modifications.
    - matheusmoreira 5y ago
      That's freaking awesome. I had no idea, is this a recent addition? I've read SDL source code some years ago and I remember seeing a X11 implementation only.
corysama 5y ago
It’s a spec for how GPU APIs can share data without necessary copying and converting through CPU memory. Mainly because the OpenGL specification explicitly does not define anything to do with windowing. But, EGL is not just and OpenGL - XWindows bridge. CUDA, GStreamer and several other APIs use it to communicate.
- floatboth 5y ago
  EGL is primarily about windowing system integration, it's what lets you initialize an OpenGL context in the first place. It doesn't really accomplish interop between different APIs on its own, though of course various interop methods are based on it — e.g. if you want to import a dmabuf, you'd use EGL_EXT_image_dma_buf_import. But, say, on the Vulkan side you'd use VK_EXT_external_memory_dma_buf — there is no EGL with Vulkan, Vulkan has its own WSI subsystem.

I'm not really sure what EGL is, but will Vulkan also run on top of EGL?

by skohan 5y ago

I'm not really sure what EGL is, but will Vulkan also run on top of EGL?

jabl 5y ago

Vulkan has WSI, which is roughly equivalent to GLX or EGL in the OpenGL world. https://github.com/KhronosGroup/Vulkan-Guide/blob/master/chapters/wsi.adoc https://github.com/KhronosGroup/Vulkan-Guide/blob/master/cha...

account42 5y ago
GLX and EGL have two roles, one is the WSI part, the other is context creation and device enumeration which Vulkan had the good sense to add to the core standard.

ZiiS 5y ago

No Vulkan dose not need/use EGL. It nativity talks to Wayland/X11.

johnvega 5y ago

"For most cases, you do all the actual rendering work in GL or GLES contexts, which you create with WGL, CGL, GLX, or EGL, depending on your platform. GL and GLES do the actual rendering. EGL and friends are basically just the glue layer to get things to the screen. (Well, to the window manager)" https://www.reddit.com/r/opengl/comments/11q0oz/what_is_the_difference_between_eglglxogl_and_gles/ https://www.reddit.com/r/opengl/comments/11q0oz/what_is_the_...

matheusmoreira 5y ago
> EGL and friends are basically just the glue layer to get things to the screen. (Well, to the window manager)" EGL can also be used directly with kernel mode setting and buffer management. No window managers necessary! A simple example I found: https://github.com/siro20/XlessEGL/blob/master/eglkms.c https://github.com/siro20/XlessEGL/blob/master/eglkms.c
- account42 5y ago
  SDL2 actually supports KMS so a number of games can run without a display server without any modifications.
  - matheusmoreira 5y ago
    That's freaking awesome. I had no idea, is this a recent addition? I've read SDL source code some years ago and I remember seeing a X11 implementation only.

corysama 5y ago

It’s a spec for how GPU APIs can share data without necessary copying and converting through CPU memory. Mainly because the OpenGL specification explicitly does not define anything to do with windowing. But, EGL is not just and OpenGL - XWindows bridge. CUDA, GStreamer and several other APIs use it to communicate.

floatboth 5y ago
EGL is primarily about windowing system integration, it's what lets you initialize an OpenGL context in the first place. It doesn't really accomplish interop between different APIs on its own, though of course various interop methods are based on it — e.g. if you want to import a dmabuf, you'd use EGL_EXT_image_dma_buf_import. But, say, on the Vulkan side you'd use VK_EXT_external_memory_dma_buf — there is no EGL with Vulkan, Vulkan has its own WSI subsystem.