Originally developed by Silicon Graphics in the early '90s, OpenGL® has become the most widely-used open graphics standard in the world. NVIDIA supports OpenGL and a complete set of OpenGL extensions, designed to give you maximum performance on our GPUs. NVIDIA continues to support OpenGL as well through technical papers and our large set of examples on our NVIDIA Graphics. NVIDIA pushed out their first Linux graphics driver beta in the 310.xx series on Monday. The NVIDIA 310.14 driver supports OpenGL 4.3, brings threaded OpenGL performance optimizations, and many other new features. The NVIDIA 310.14 Beta for Linux is an exciting release!
This is part 2 of the 'Introduction to Win32 and OpenGL 4.3' series. In this post, we'll have a look at NVIDIA Optimus and selecting your Graphics card: we'll want to make sure we have a graphics card that supports OpenGL 4.3 in the first place!
2. OpenGL 4.3
2.1. Laptop
When I wanted to get OpenGL 4.3 running, I was immediately confronted with the presence of an integrated and a discrete graphics card on my laptop: my application kept returning an OpenGL 4.0 context! It turns out that the answer was provided by glewinfo.exe, a program provided with GLEW.
When we look at the 'NVIDIA Control Panel', we see that the preferred graphics processor has been set to 'Auto-select', this basically means that the the integrated graphics card will be selected.
| Preferred Graphics Processor is set to Auto-select |
We can confirm the selected graphics card, by running glewinfo.exe, a program provided together with Glew. A part of the glewinfo.exe output can be found below:
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GLEW Extension Info
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GLEW version 1.9.0
Reporting capabilities of pixelformat 3
Running on a Intel(R) HD Graphics 4000 from Intel
OpenGL version 4.0.0 - Build 9.17.10.2843 is supported
GLEW Extension Info
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GLEW version 1.9.0
Reporting capabilities of pixelformat 3
Running on a Intel(R) HD Graphics 4000 from Intel
OpenGL version 4.0.0 - Build 9.17.10.2843 is supported
Our assumption has been confirmed, the integrated graphics processor, in this case an 'Intel HD Graphics 4000' GPU was selected. However, we see that the supported OpenGL version is limited to 4.0! To this date (25/06/2013), I didn't find a driver that enables OpenGL 4.3 for this GPU. When we set the preferred graphics processor to High-Performance NVIDIA processor, as can be seen in the following picture, we will select the NVIDIA graphics card:
| Selecting the high-performance NVIDIA processor |
Indeed, glewinfo returns the following:
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GLEW Extension Info
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GLEW version 1.9.0
Reporting capabilities of pixelformat 1
Running on a GeForce GT 630M/PCIe/SSE2 from NVIDIA Corporation
OpenGL version 4.3.0 is supported
GLEW Extension Info
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GLEW version 1.9.0
Reporting capabilities of pixelformat 1
Running on a GeForce GT 630M/PCIe/SSE2 from NVIDIA Corporation
OpenGL version 4.3.0 is supported
We can see that the NVIDIA graphics card was selected, moreover, OpenGL 4.3 is supported on this card! (Please see the NVIDIA website for the graphics cards and minimum driver version required for OpenGL 4.3).
Now, in order to save precious battery power of your PC, you most likely don't want to enable the NVIDIA graphics card by default, nor do you want to ask the user of your application to select the graphics card manually. So there must be a way to do this programmatically. Indeed, NVIDIA provides the answer by its NVIDIA Optimus technology.
It turns out that it doesn't need to be more complex then exporting the following variable in order to select the NVIDIA card from within your application:
Some other possibilities are explained more indepth here.
2.2. Desktop
Install Opengl 3.3 Windows 10
OpenGL 4.3 was relatively straightforward to get up and running on my desktop. I just needed the latest driver for my NVIDIA GT 640, which unlocked OpenGL 4.3.
3. Future postNvidia Opengl Driver
Now that we have a graphics card and we are certain that it supports OpenGL 4.3, we'll set up our OpenGL 4.3 context in our Win32 application in the next post.