Questions tagged [gpu]
The gpu tag has no usage guidance.
125
questions
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1answer
37 views
Compute shader workgroups execution and size [closed]
I want to clarify how are workgroups executed on various GPUs, thus I have several questions. I know that different GPU architectures work differently, but I expect an answer YES if there is single (...
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1answer
74 views
2d gpu powered rendering engine
First of all I am not sure if this is the correct place to ask my question. If it is not please be so kind to point me in a direction where my question is relevant.
A while ago I came across this ...
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1answer
71 views
Is drawing Bezier curve with scanline algorithm possible with Vulkan?
As an information, Vulkan is a low-level abstraction layer thru modern GPU. It allows programmers to program the GPU and assemble rendering pipeline. On that pipeline, there are modules of program ...
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1answer
41 views
Are intersections still hardware accelerated if we define a custom intersection program in Optix?
I've stumbled into Optix samples that define their own intersection programs to define how primitives intersect (or don't) with a ray, and others (mostly those only dealing with triangle meshes) that ...
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1answer
35 views
Is it possible to get recording device from meta data?
Im not sure if this is the right section to ask this question but i figured its worth a shot.
Is it possible to take metadata from a video and use that data to identify what phone model was used to ...
3
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1answer
35 views
Why does UV tiling affect performance in volumetric ray marching?
I am building a volumetric ray marching shader in HLSL in Unreal Engine, based on Ryan Brucks’ work: https://shaderbits.com/blog/creating-volumetric-ray-marcher
I am trying to add some additional ...
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25 views
How to troubleshoot GPU card that fails after weeks and works well after restart?
A computer "Controller" that controls several screens has separate GPU Cards attached.
after weeks of running smooth screens attached to "a card" will fail showing no signal and ...
1
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2answers
143 views
What data is passed from the CPU to the GPU each frame?
I've been reading a bit about the graphics pipeline for processing on a graphics card, and I'm interested to know in what kind of format data is passed from the CPU to the GPU when rendering 3D ...
5
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1answer
489 views
What are 'mesh clusters' / hierarchical cluster culling (with LOD?) / triangle cluster culling and how do they relate?
I've seen several references to this and related concepts now but I can't find any hard details about these systems, and how they are implemented.
The earliest reference I can find is from the "...
5
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1answer
568 views
Binding vs bindless
I was trying to understand what exactly is 'binding'. I found an answer on quora on this. From this, binding basically sounds like sending data from to GPU with help from CPU. I got to know more about ...
0
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1answer
32 views
How does the OS + hardware support multiple screen resolutions and multi-display?
Modern operating systems support a wide range of resolutions. Mine ranges from 800x600 to 1920x1080. They also support multi-displays. I've never tried it but I have seen other users with 2 or 3 ...
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3answers
61 views
FLOP - exact definition
I am interested in how much a GPU can actually calculate. When learning about rendering, it seems like a good idea as well.
My Question:
WHAT EXACTLY is a Floating Point Operation?
I know what a ...
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1answer
101 views
Using Software Rendering to make an External GPU
I was looking at the Raspberry Pi 4 specs and realized that running a software renderer on the pi could get some decent graphics. By using USB ports and Ethernet ports, I think I might be able to send ...
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1answer
61 views
is utilizing multiple GPUs better than using one for all software?
In cases of Laptops, some will have two GPUs. One is built-in (e.g. Intel) and another one attachable (e.g. Nvidia).
Is it better to have each of them operate different software to divide the load?
or
...
2
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2answers
127 views
Why do some videos look smoother and others don't on the same monitor
I have a Dell monitor with 60 Hz refresh rate and therefore games playing on it are not very smooth as compared to 120 hz.
But when I open videos on YouTube of the same game on the same monitor, some ...
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0answers
52 views
GL_OUT_OF_MEMORY Error when glDispatchCompute takes longer
I built a simple Ray Tracer which takes use of OpenGL's Compute Shader and traces ".obj" Files.
The results are passed to the Host-Program via glMapBufferRange after finishing computing.
...
0
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1answer
79 views
Operations in the Rendering Pipeline
I have a few short question regarding operations happening in the rendering pipeline (OpenGL, Vulkan, I'd expect for all questions to have similar answers for these two frameworks while DirectX might ...
1
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1answer
1k views
Optimizing compute shader with thread group shared memory
I'm currently learning compute shaders and I'm trying to write an optimized Game Of Life. I have a first version working that uses a Shader Storage Buffer Object. I dispatch a thread per cell I want ...
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0answers
48 views
GPU accelerated 2D graphics library with signed distance functions
I want to create my own 2D graphics library using signed distance functions where everything is drawn on the GPU. Browsing the web I quickly found Inigo Quilez website that describes how to draw basic ...
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0answers
47 views
What modern C++ Unit Testing Framework do you use for highly parallel image, 3D and higher dimensional matrix processing workloads? [closed]
Most of the existing open-source libraries such as OpenCV, Tensorflow, and Pytorch use Google Test. I would like to know about strong alternative testing frameworks that thrive under a similar ...
1
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1answer
46 views
Do we have OpenGL shaders write out the intermediate *.o-esque file on first compile so that we can skip compiling them in run-time every single time?
Shaders get compiled during runtime every single time an app starts. I understand the reasoning for this is that there are so many GPU architectures out there that it does not make sense to ship pre-...
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0answers
25 views
Visualizing auras around clusters of points
For a real-time application I am trying to add glow to a few hundred points. These points are more like 2D circles of various small sizes on the screen.
These points are supposed to be like balls of ...
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0answers
163 views
Queue from a family queue that supports presentation doesn't work [Vulkan]
I'm following this tutorial on Vulkan and I tried to see if it actually worked with different queues for drawing and presenting the image of the triangle. My GPU supports presentation with every queue ...
0
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1answer
239 views
Sending programs from CPU to GPU
How does a CPU know which piece of code should be executed on GPU (i.e how to recognize whether a code is shader or not) and how is it been sent to GPU VRAM?Is it via DMA?
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74 views
After making any 3D model using Opengl how to export it's data in .dae file?
I'm trying to make simple 3d modeling program in c++ with Opengl. So I don't know how to transfer/convert/export or save data of 3D model in .dae file.
NOTE:- 3d model is made using Opengl ...
2
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3answers
316 views
Latency difference between texture copy on GPU vs CPU?
Does anyone happen to know the latency difference between copying a texture on cpu (using, say, memcpy) compared to gpu (using, say, ...
1
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1answer
50 views
Performance of particle implementation
I am about to implement the renderer for a simple particle system. Every particle has to be updated every frame (position, rotation, scale) and so I was wondering which way is usually faster:
...
4
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1answer
345 views
Double buffering always necessary?
Question from the graphics newbie:
What I know by now is that "usually" double buffering is used: You calculate the content of frame x+1 while frame x is shown on the screen, if you want to achieve ...
1
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1answer
129 views
Tessellation Speed in terms of interpolated points per second
For a research project, I have written a Tessellation Shader to interpolate solution points of a 3-Dimensional mathematical equation. Therefore I don't use any techniques for displacement, I merely ...
3
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1answer
733 views
Is it possible to do color conversion on decoded video without getting it from GPUmemory to CPU memory?
Decoding video will result in different pixel formats on different GPUs and drivers. I have an application which can render (using OpenGL), only the RGB8 pixel format, therefore I need to do color ...
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0answers
145 views
Software Rendering Display Latency
I've been doing some reading as to how to reduce input delay on modern computing devices. A lot of my understanding from this comes from the VR research paper by Carmack explaining the numerous ...
7
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1answer
1k views
Is vkCmdPushDescriptorSetKHR efficient?
I am new to Vulkan. Compared to DX12, the resource binding procedure seems a little bit complicated. In terms of per draw call uniform buffers, I currently have two approaches in mind, and they both ...
2
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0answers
25 views
Should I use common resource bindings across all my shaders in HLSL/D3D12?
Will unaccessed bindings consume cache or bandwidth? I want to improve cache usage by splitting the per-path information in my renderer across different resources, but I also want to keep my binding ...
2
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1answer
753 views
Floating Point Operations in Line Drawing Algorithms
When it comes to line drawing, DDA is the simplest and most intuitive algorithm, the core idea being:
compute the slope of the line
for every increment in x, increment y by the slope
However, DDA is ...
1
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1answer
220 views
How can I control memory for command allocators and command queues in D3D12?
The D3D12 programming guide suggests specific allocation strategies for command queues and allocators, but the creation methods for those objects operate directly on queue/allocator pointers without ...
2
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1answer
130 views
What does GPU serialized mean?
With GPU isolation : multiple processes use the single GPU will be serialized, cause OOM easily
link
https://www.slideshare.net/mobile/Hadoop_Summit/deep-learning-on-yarn-running-distributed-...
4
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1answer
329 views
How much does driver quality affect Vulkan and DX12 compared to OpenGL and DX11?
Considering the fact that Vulkan and DX12 delegate most of the memory management / work scheduling tasks to the application itself, how much do drivers affect performance?
To put my question into ...
2
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1answer
2k views
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 transfer ...
9
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2answers
2k 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
79 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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0answers
80 views
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
2k 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
894 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
63 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
845 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
votes
1answer
200 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
432 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-...
3
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1answer
176 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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2answers
5k 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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4answers
12k views
What does GPU assembly look like?
I have played around with CPU assembly programming like Nasm, Tasm or Masm, but I'm really curious to know how GPU works now.
However, i'm quite confused when I look on internet. I've heard about Cuda ...