Questions tagged [gpu]
Questions related to the massively parallel computing units targeting effective computer graphics in modern machines.
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Performance impact/implications of constant buffers / uniform buffers
Constant buffers stay constant throughout entire dispatches / draw calls, and thus their data can presumably be shared as efficiently as possible between different threads using those buffers.
But I ...
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AMD GPU specific triangles disappearing by subsequent draw calls in same frame
we have a Windows/DirectX11 2D Renderer that paints textured triangles to the screen from back to front. There is no face-culling or depth test activated.
Now on AMD GPUs it happens randomly that an ...
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"Smoothing out" raymarched reflections
I am writing a program to display 3-dimensional lattices (honeycombs) using raymarching and reflections. I made a simple cubic honeycomb to start. The usual method is to use a repetition operator, by ...
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What is the theory behind a CPU being able to do everything a GPU can? Can I have something GPU based that can not run on a CPU?
GPUs have a smaller instruction set than a CPU does, but that means that from an architecture POV all the instructions in a GPU have a combination of slower CPU equivalent instructions?
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How many rays can one RT core calculate simultaneously?
I have noticed that all GeForce RTX cards, without exception, have an equal number of RT cores as they have streaming multiprocessors (SM). From this fact I assume that each RT core is associated with ...
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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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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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What is the difference between a "meshlet" and just a small mesh?
Obviously, conceptually, a meshlet is just a small mesh. But what is the reason for making the distinction then? I'm assuming it has to do with how they are implemented.
In a meshlet architecture, ...
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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 ...
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What motherboard spec should i look for using 4 displays
I am not sure if i am on the right forum. Let me know where to go if i'm wrong.
I have an ASUS mATX motherboard H110M2 and PNY Quardro P620. Initially I put it into a mini tower which only had a 450W ...
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Am I risking damaging my GPU?
I have written a relatively simple interactive C program using OpenGL 4.4 with a vertex shader and a fragment shader, running in the CodeBlocks IDE on Windows. I included an FPS counter basically as ...
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Why can't we have hardware-specific graphics APIs?
Right now, if you want to use a GPU, you have to do it through graphics APIs like DirectX or Vulkan. These APIs are meant to be hardware-independent, but more often than not, they are tied to a ...
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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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Why use buffer streaming instead of collecting data on CPU and uploading to GPU all at once
Say I have a couple of meshes that I want to reupload to GPU for each frame. I can do this by generating a single array from all the meshes on CPU and then uploading to GPU (ex with ...
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Dynamic array approach for GPU buffers
On CPU dynamic arrays are often used to store data of dynamic size, and often implemented by doubling the size when the array is full and copying the data over. The data structure has amortized O(1) ...
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How to compute a GPU's theoretical GFLOPs based on its specs?
I was looking at the specs of this GPU in particular, and tried to compute its theoretical GFLOPs based on more basic specs, such as clock frequency and number of CUDA cores.
My first thought was: ...
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What does memory bandwidth of a GPU mean exactly?
This question is motivated by looking at two numbers for different GPU's: (1) the memory size and (2) the memory bandwidth.
My understanding is that memory bandwidth means, the amount of data that can ...
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Inter-Process communication in compute shaders
How do I write a code to facilitate common shared memory for communication between multiple shaders as well as processes within them in python?
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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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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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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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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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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 ...
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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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How many polygons in a scene can modern hardware reach while maintaining realtime, and how to get there? [closed]
A fairly basic, in some ways, question, but one that many people, myself included, don't really know the answer to. GPU manufacturers often cite extremely high numbers, and the spread between polygon ...
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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 ...
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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 "...
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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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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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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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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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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
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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.
...
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Why do adjacent triangles never overlap when rasterized?
Apologies for the following noob question, it's just I can't find a satisfactory answer anywhere...
When I render a simple axis-aligned quad made up of two triangles, I don't understand why there's ...
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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 ...
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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, ...
CommunityBot
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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 ...
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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 ...
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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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Cloud based VR would be the future?
According to the following assumptions, I think Cloud based VR would be the future:
1) Real world scene rendering needs ray tracing or other complex computing graphics technologies. It needs a lot of ...
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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 ...
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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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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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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 ...
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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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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 ...
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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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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:
...
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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 ...
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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 ...
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