Who implement OpenGL libraries? (*.c files)
Whether there is cross-platform implementation of
the library, not dependent of drivers?
The GPU driver developers as part of their GPU drivers
Yes, but it will never be able to talk to GPUs and is limited to a software renderer: "Mesa llvmpipe" and "Mesa softpipe" are these implementations.
OpenGL is an open cross platform API STANDARD. The implementation is specific to the graphics card being used. On linux there is Mesa which was originally written as a software only implementation but is now used by Intel an AMD. Nvidia has its own solution.
Related
I am working on an embedded project. The hardware is based on the BeagleBone Black platform.
There seems to be a conflict between the OpenGL hardware driver for the TI GPU and the CAN driver that is causing problems.
We are using Qt5.8 for all our graphics. We are not doing anything fancy, but we are using Qt Quick 2 which requires OpenGL.
Since we are not doing anything fancy software rendering might be fine.
Can someone tell me if there is a way to install some kind of Software implementation of OpenGL on Debian 8 on this platform?
I have heard of Mesa, but can't find details on install it in software rendering mode.
On Linux, 99% sure you need Mesa, but see here. Note: nowadays Mesa supports newest OpenGL versions.
If the hardware acceleration has problems for you, try forcing software emulation.
Some hints in this link
I'm doing an OpenGL course but only have integrated graphics with my Intel processor. Upon doing some research it seems I can use the Mesa implementation of OpenGL with my integrated graphics.
On the installation page it says it requires python, but my course will be practicing OpenGL in a C++ environment.
I've also been looking at OpenGL tutorials online in C++, and there are many libraries used for simplifying common tasks in OpenGL. Will I be able to use these libraries with Mesa in C++, and if so, how would I approach this?
I want to use latest OpenGL features on Ubuntu. And I have installed mesa-common-dev but as far as I understand mesa does not support OpenGL 4.5 features. Also how can I use OpenGL via hardware without any API ?
Note :
glxinfo | grep "OpenGL version"
OpenGL version string: 4.5.13397 Compatibility Profile Context 15.20.1046
I want to use latest OpenGL features on Ubuntu. And I have installed mesa-common-dev but as far as I understand mesa does not support OpenGL 4.5 features.
All that matters is, that your actual OpenGL implementation supports the profile you want. The Linux ABI on OpenGL is pinned to OpenGL-1.2 (LSB5 has been released recently, so expect upcoming distribution releases to follow it, which bumped it to OpenGL-2.1).
Anything that goes beyond the ABI requirements is done through the extension mechanism. I.e. use load function pointers through …GetProcAddress and introduce new tokens with a glext.h. This processes has been repacked into OpenGL extension wrapper-loader libraries like GLEW.
The stuff mesa-common-dev provides is what's written down in the Linux LSB ABI specs… in a vendor neutral way, so you can compile your program using mesa-common-dev stuff, but it will work with the NVidia or AMD/ATI drivers as well.
Also how can I use OpenGL via hardware without any API ?
By definition you can't. OpenGL is an API. If you remove the API you remove OpenGL. If your intention is working the naked GPU on the bare metal, well, that would boil down to writing a full driver. In a few weeks/months Vulkan will be released and this gets you much closer to the GPU than OpenGL.
I need to do hardware accelerated OpenGL rendering on VxWorks5.5 platform. After days of googling, I am confused about the following questions:
Stand alone Mesa3D can only do software rendering on VxWorks?( Provided that I ported Mesa3D to VxWorks)
Mesa3d combine with DRI can do hareware accelerated rendering on VxWorks? If so, Do I need an extra OpenGL hardware driver besides Mesa3d+DRI? (Mesa just provide gl APIs and DRI is the one which implement concrete hardware rendering, is that right?)
Are there any commercial solutions out there?
Is it possible for you to upgrade your vxworks? You can refer to the documents to see if it meets your requirement
If yes, From VxWorks 6.9.3.3 onwards, Mesa driver is supported for Wind Media Library also. You can find the detail info in Wind River Media Library SDK Programmer’s Guide.
If you have upgraded to VxWorks 6.9.3 Update Pack 3 or above, you should have the mesa directory in the installation :
/components/windml-5.3/src/mesa-7.6.1
For more information on the mesa driver for Wind Media Library, please refer to the Wind Media Library SDK Programmers Guide 5.3 Edition 3. Specifically Chapter 3 about building Media Library, under section 3.5.1 and Chapter 8 on OpenXX applicaitons.
Wind Media Library SDK Programmers Guide 5.3 Edition 5 has the information pertaining OpenGL ES1, OpenGL ES2, and Open VG supported only by the PowerVR drivers.
So as the title says, which one would you choose? It would be great if one can also explain the reasons behind.
FreeGLUT is a simplicistic framework for the creation of small OpenGL demos. Alternatives to FreeGLUT would be SDL, GLFW, or full blown frameworks like Qt.
Mesa is a open source implementation of the OpenGL API, and together with the DRI/DRM project drivers forms a full HW accelerated OpenGL implementation. If you're using Linux and use your GPU with open source drivers, Mesa is the OpenGL implementation you use. That's not a choice, that's a fact.
They're completely different things and neither can replace the other.