7 votes
Accepted

How much precision (half, float, double, etc) is enough for a Color class?

Colors shown on your display or saved to standard image file formats use 8 bits per component. So to store these colors it suffices to use four bytes (unsigned char)...
Nathan Reed's user avatar
4 votes
Accepted

What happens with the framebuffer after the fragment shader is done?

It entirely depends what hardware and OS you're on. It's up to the integration between the windowing system and GL. In the simple case where one application is rendering full-screen directly, the ...
Dan Hulme's user avatar
  • 6,770
3 votes
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What data is passed from the CPU to the GPU each frame?

How much data is passed from the CPU to the GPU per frame depends on the engine you are using and its needs. Usually, you want to keep it minimal to avoid that the GPU needs to wait for data because ...
wychmaster's user avatar
  • 1,251
3 votes
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Is it Possible to send data directly to the GPU via a custom hardware interface?

On a desktop (or laptop) the GPU is connected to the PCIe bus. This gives it direct access to the physical RAM. If you map the buffer you want to fill and then read a file into that mapped memory. ...
ratchet freak's user avatar
3 votes
Accepted

What do the OpenGL version strings from glxinfo actually mean?

When creating a OpenGL context you have to specify a profile mask, which is a way of telling the driver whether you want to use compatibility ("legacy") features or not. Drivers are required to ...
joe_chip's user avatar
  • 237
2 votes
Accepted

Is there a performance implication if the frame buffer resolution and the physical screen resolution are different?

For PCs with discrete displays, the resampling to the screen resolution may happen either on the computer prior to the signal being sent to the display, as part of window compositing, or on the ...
Nathan Reed's user avatar
2 votes

What were the benefits of quads used by Nvidia's NV1 over tri based rendering?

There seems to be a lot of confusion around the NV1, so I tried to find a few actual sources. It looks like NVidia and SGS-Thomson entered a partnership [#1] [#2] for a "Multimedia Accelerator&...
dirkt's user avatar
  • 128
2 votes
Accepted

How can I test my GLSL code on different hardware?

I highly recommend getting at least 1 card from one of the other vendors like AMD. It doesn't have to be fancy, the cheapest thing you can get off ebay will help. Just make sure it supports the same ...
pmw1234's user avatar
  • 3,129
2 votes
Accepted

On modern GPUs, what hardware do vertex/pixel shaders have access to that compute shaders don't?

what hardware do standard graphics pipelines have access to which general purpose GPU programming APIs dont give access to? Every part of the graphics pipeline and architecture that isn't a shader. ...
Nicol Bolas's user avatar
  • 9,752
1 vote
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Compute shader workgroups execution and size

Since you mentioned CUs and SIMDs, I wrote this mainly from the perspective of AMD's GCN architecture, but broadly speaking the answers apply to other GPU architectures as well (except for #2 which is ...
Nathan Reed's user avatar
1 vote

What data is passed from the CPU to the GPU each frame?

The short answer to this question is: everything On any give frame almost any kind of data my be needed to render that new and wonderful object that just popped into view. It's shader needs to be ...
pmw1234's user avatar
  • 3,129
1 vote

Rasterization: How does hardware disambiguate identical Z values at silhouette edges?

If you are taking about this occurring within a single draw call for a single object then you are talking about rasterization not Z fighting. So the real question is, "how are two triangles ...
pmw1234's user avatar
  • 3,129
1 vote
Accepted

How does the OS + hardware support multiple screen resolutions and multi-display?

Any hardware in the graphics card is fixed. No, the storage of a graphics card is fixed. How that storage gets used, particularly on any semi-modern graphics card, is flexible. Essentially, what a ...
Nicol Bolas's user avatar
  • 9,752
1 vote

FLOP - exact definition

Just to add to whychmaster's reply, in my experience, on a GPU, a floating-point operation, when used in quoting FLOPS (floating-point operations per second) benchmark figures will refer to Addition (...
Simon F's user avatar
  • 4,231
1 vote
Accepted

What is the oldest hardware able to feasibly support Vulkan?

Khronos publishes a list of Vulkan compliant hardware here. The list also shows compliance to different flavors of OpenGL. I don't know all the card models, but for NVIDIA at least the GeForce GT 630 ...
bernie's user avatar
  • 830
1 vote

Precision problem on AMD

In HLSL, you can use the built-in fmod function for this. I'm not sure what's going wrong with your implementation, though. It looks mathematically correct. It's ...
Nathan Reed's user avatar
1 vote

Why did AMD's putting an SSD on a GPU board reduce latency so much?

Answering from a somewhat layperson's perspective (I'm not a hardware expert, but I have built my own computer), I'll analogize, using the situation of getting some ingredients for cooking food. ...
Ben Sandeen's user avatar
1 vote

Is there a performance implication if the frame buffer resolution and the physical screen resolution are different?

This is the screen's video scaler module. Essentially, it is a dedicated piece of silicon that allows the user to use non-native screen resolutions.
RichieSams's user avatar
  • 3,732
1 vote

MSI GTX 950 2GD5T triangles per second

In my tests a GTX 1050 can do ~1B triangles with glDrawElementsInstanced(GL_TRIANGLES, .... That's roughly 2/3 of chip clock. Arguably ...
Anton Duzenko's user avatar

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