Questions tagged [gpu]
The gpu tag has no usage guidance.
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Do I need separate Graphics and Transfer commands?
I was following this tutorial on Vulkan https://vulkan-tutorial.com/Vertex_buffers/Staging_buffer and I decided to do this bit:
The buffer copy command requires a queue family that supports ...
5
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1answer
653 views
Why are oct trees so much more common than hash tables?
When reading papers I commonly find Oct tree implementations of geometry representations to sort the data. However whenever I think about the problem hash tables seem better overall.
Hash tables have ...
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1answer
52 views
What objects do get loaded into GDDR?
I currently have a 4K monitor and want to buy a new graphics card. My choice would either be the RTX 2080 or the RTX 2080 Ti. Now I need to know which one I really need. The Ti variant has 12 GB of ...
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Does MRG32k3a compare well with PCG and Xorshift256*?
I've been using standard 32-bit Xorshift in my GPU path-tracer for a while, following Nathan Reed's approach with hashed seeds and decorrelated state. I (finally) discovered today that Xorshift is ...
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2answers
73 views
Is it possible to emulate Vulkan on a non Vulkan compatible gpu?
I don't think there is much to explain here, since the question is pretty much in the title, but i'll try to explain myself better:
My current laptop's gpu does not support Vulkan, so i was wondering ...
4
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2answers
93 views
Difference in pixels between different monitors' sizes
If I have an image of x/y resolution and display it on a monitor, does this mean that between a 15-inch monitor and a 42-inch, the same amount of pixels (x/y) will be displayed, only that each pixel ...
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0answers
44 views
Evenly distributed point cloud for a grass renderer on a sphere
I'm trying to add some details like grass, rocks, trees, etc. to my little procedurally-generated planet. The meshes for the terrain are created from a spherified cube which is split in chunks (...
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1answer
145 views
Procedural terrain: What's the best approach to calculate noise in the GPU?
A few years ago I started creating a procedural planet engine/renderer for a game in Unity, which after a couple of years I had to stop developing due to lack of time. At the time i didn't know too ...
6
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1answer
109 views
Same draw call causing extremely different GPU usage under different triangle orders
So I have a bit of a predicament I am trying to solve. I have 10,000 triangle strips I am trying to draw. Each one has a z-order for the entire strip and within each strip the most recent triangles ...
4
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1answer
103 views
Using multiply and accumulate of 4x4 matrices for ray-triangle intersection tests on GPU
Is it possible to gain performance boost using new 4x4 MAD from NVIDIA'a tensor cores for ray-triangle intersection tests?
Really there are two questions:
Is it possible to modify some of the ray-...
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1answer
59 views
Why isn't multi-gpu handled by the driver?
I hope I'm not off topic here, but this seemed like a good place to ask something like this.
I've been hearing about SLI and Crossfire for a long time and how support for it is lacking.
I never ...
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1answer
116 views
Can I use my phone's gpu as an external gpu for my laptop?
My phone is Sony Xperia XZ1 Compact which has Adreno 540 as gpu. My laptop's gpu is NVIDIA GeForce 940MX 4GB which seems to be much worse than my phone's gpu. My PC's OS is Ubuntu 16.04.
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3answers
174 views
How does GPU assembly looks like?
Sorry for repost, my goal wasn't to be on the top of the list xd. I just thought this wasn't the good place for this question but finally, I don't really see where else I could post it if not here. ;)
...
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0answers
51 views
How do modern GPUs handle branching instructions in shader code?
It has often been recommended to avoid branching conditions in shaders.
Why? What happens exactly in modern GPUs in that case?
Is it still recommended to avoid branching?
4
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1answer
95 views
How to estimate what GPU (2D/3D/none at all?) is necessary?
I have to do some operations on 2D grayscale images. The "normal" stuff like moving, alpha blending and resizing, but also "3D like" operations: Perspective projection, rotation around any axis (x, y, ...
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1answer
141 views
Distorted OpenGL graphics in certain models of Intel GPUs under Windows; possible causes?
I'm not sure this is the best place to post this, but it definitely seemed more appropriate than programming. I'm one of the developers of Performous, essentially a karaoke (and instruments) game. We ...
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0answers
77 views
Using GPU instead of CPU in Scala
I wrote a program that displays points expressed in 3D in a 2D canvas, using perspective projection. The aim is to display a cube. Each face of the cube is drawn by linearly interpolating the points ...
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1answer
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If I have more than enough memory, can it still be beneficial to use compressed textures?
I'm wondering whether some of you would have tested and seen quite a difference in using a compressed texture even when the OpenGL environment does not need saving any memory (i.e. the card has more ...
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0answers
93 views
Reference Book on GPU Drivers Architectures [closed]
What is a good book to be used as a general reference about the architectures of GPU drivers?
Example of sections I would be looking for:
- Theoretical descriptions of how drivers might or should work....
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0answers
93 views
What techniques are used to build ray intersection acceleration structures on the GPU?
What improvements and alternatives have been developed since HLBVH was introduced in the 2010 paper HLBVH: Hierarcihcal LBVH Construction for Real-Time Ray Tracing of Dynamic Geometry by J. Pantaleoni ...
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0answers
55 views
Vulkan's vkEnumeratePhysicalDevices does not detect Radeon GPU
I am on a ubuntu 16.04 machine with a Radeon HD 8670M card. I had installed the examples provided by LunarG on their github repo and they compiled and executed successfully.
To teach myself how to ...
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0answers
92 views
Efficient operations on polyhedra
I currently perform several operations on polyhedra with cgal. These operations include
Union of two or more polyhedra
Difference of two or more polyhedra
Intersection of two or more polyhedra
...
5
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2answers
203 views
How did the hard, accurate shadows, work in early 3d (2000 - 2004) games?
I've been hunting around the internet for a while now, and I can't find anything about the specific shadow technique that I'm looking for.
I can only recall one game in particular that used it, and I ...
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1answer
64 views
How many GPUs can you simultaneously output from using a single PC?
I'm aware that it's technically possible to connect a large number of GPUs to a PC for mining purposes https://www.pcgamer.com/asus-has-a-motherboard-that-supports-up-to-19-gpus/, but how many of ...
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1answer
70 views
“How does the Shadow of The Colossus's™ proprietary (Sony's) engine perform its seamless long distance rendering?”
"How does the Shadow of The Colossus™ engine perform its seamless long distance rendering?"
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0answers
110 views
Is Nvidia's delta color compression supported in CUDA, or with DirectX UAVs?
Nvidia discusses their lossless delta color compression is on its fourth generation in Pascal, and that it transparently saves bandwidth behind the scenes for rendering workloads. AMD has a similar ...
6
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1answer
158 views
Why sending data from gpu to cpu is slower than cpu to gpu?
Why sending data from gpu to cpu is slower than cpu to gpu?
I heard the relation is similar to network situation, in detail, the upload is slower than download. However, I could not understand the ...
3
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1answer
97 views
What mechanisms are being used by Directx12 and Vulkan APIs in order to communicate with graphic card drivers internally?
I am trying and learning to develop a low level graphics API.
I want to know, how do modern graphics APIs manage to communicate with graphic card drivers (to tackle GPU) so efficiently and in an ...
9
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1answer
189 views
The most performant way to organize vertex data on modern GPUs
Say I have a model made up of vertices, each with position, normal, tangent, and ...
3
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1answer
176 views
Clipping for perspective projection
In the following two graphs,
the red lines are borders of the perspective-projection frustum,
the blue lines are to be rasterized,
the green lines are perspective-projection lines, which are wrong.
...
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1answer
82 views
Process of compute shader in OpenGL
I'am curious about compute shader in OpenGL.
Let's assume the number of points (vec4) is 900
and the work group size(= the number of work items) is 256
Then, We would have four work groups because ...
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0answers
325 views
YUV (NV12) Chroma subsampling while converting from RGB image
I convert RGB input to YUV 420 semi-planar output using compute shader.Luma plane is straightforward as it maps 1:1 with RGB dimensions. As we know, NV12 packs Cb and Cr into one plane, which means ...
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1answer
107 views
Should I prefer an AMD or Nvidia GPU for studying graphics programming, especially with respect to vendor specific debugging tools and ecosystem?
My current laptop has a fairly old Intel integrated GPU which was good enough for following simple tutorials.
I am now keen on getting to grips with advanced techniques and newer APIs, and so I am ...
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1answer
286 views
The mathematics of two dimensional interpolation on a quad
I am trying to wrap my head around how exactly the GPU interpolates texture coords on a quad. I realize to the GPU a quad is two triangles but I find thinking in terms of the whole quad to be easiest.
...
3
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1answer
98 views
Handling GPU resource management
I recently finished the base implementation of a DX12 rederer and I started to think in ways of improving the performance. I think that one problem that my implementation has, is memory fragmentation, ...
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1answer
937 views
What is the difference in overlay and framebuffer?
I have been trying to understand display and graphics. I feel that it's hard to make a logical image of the terms. I understand this:
Frame buffer is a dedicated memory that has the image/video/...
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0answers
152 views
What aspects of GPU architecture are computer graphics programmers expected to be intimately familiar with? [closed]
I am an aspiring CG programmer and would like to know what some of the more nuanced aspects of computer architecture are.
I have already taken several introductory arch courses where we've covered ...
5
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2answers
274 views
Can a scene graph be stored in the GPU?
I am starting to learn WebGL. Can a scene graph be stored in the GPU? Or is that type of thing more for the main thread (or webworker)?
For example, I want to calculate some layout, and apply it as a ...
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1answer
196 views
Can I use QueryPerformanceCounter to measure single draw or compute call performance?
I know I can use QueryPerformanceCounter for measure time for whole single frame. But can I when it comes to OpenGL draw or compute call?
I always assumed that, as ...
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1answer
118 views
Is it Possible to send data directly to the GPU via a custom hardware interface?
Is it possible to directly bypass the CPU while transferring data to the GPU? could there be hardware which gives the GPU direct memory access to a data stream for real-time GPU processing and ...
6
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1answer
438 views
Do GPU performance improve when rendering at native or half resolution, compared to fixed scaling?
This might be an odd question, but I was wondering if you could improve GPU performance with games, comparatively, when using doubles/halves of the native resolution, instead of an odd ratio of that.
...
6
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1answer
273 views
What is the difference and/or relationship between the OpenGL SDK and the OpenGL GPU driver?
I'm brand new to OpenGL and graphics programming in general, and I'm trying to figure out what software I need to program a GPU. I saw an NVidia OpenGL driver, and I've also seen reference to the ...
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1answer
892 views
Why do GPUs still have rasterizers?
Despite advancements modern GPUs still have fixed rasterizers. Highly customizable, with programmable shaders but nevertheless not fully programmable.
Why is that?
Why can't GPUs be simply massively ...
5
votes
1answer
214 views
Where is the best place for Tangent-bitangent calculation, in shader or in C/CPP code?
I have two methods of calculating tangent and cotengent (needed for normalMap lighting calculation).
The one is doing it from CPP code (with assimp library for example)
The second is doing it ...
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0answers
81 views
Image cleaning - removing all regular shapes ( circles, squares, text, icons etc. )
I'd like an automatic method to clean images. I've been looking at the GIMP, and its command line (cli) interface, in scheme / lisp. It looks very promising, but I'm a complete novice, so I'd be ...
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What is a good algorithm, and framework, to calculate centres of gravity or mass (cog)?
I'd like to take an photograph, subdivide it into a tesselation, either of squares, or (ideally), hexagons, and then find the centre of gravity (or, if you prefer, centre of mass) of each cell of the ...
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1answer
309 views
Distributed parallel rendering in Gaming or VR rendering
VR rendering needs a lot of GPU power. VR SLI can help that. But, is it possible for us to use distributed parallel rendering technology to improve the performance dramatically? There is an open ...
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1answer
196 views
Why did AMD's putting an SSD on a GPU board reduce latency so much?
AMD have recently been in the news with an interesting Radeon Pro board with a couple of M2 SSDs on it.
As some of the more detailed stories (here or here, for example) note, the benefits may ...
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1answer
149 views
What modern real-time rendering applications still use fragment shader depth writes / late-Z?
It is pretty well known that writing depth in your fragment shader generally disables "early Z" test/write optimizations that modern GPUs rely on for fastness. Nonetheless, APIs still allow it and ...
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1answer
102 views
How to ensure a fragment shader only runs once
I am trying to programmatically figure out how many "texture2d " calls the gpu can make before the fps drops below 60fps.
My current way of doing this is to have a fragment shader with a for loop ...
