Questions tagged [performance]

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Vulkan (Hardware) Path Tracing Formulation

I've been implementing a path tracer in Vulkan using the VK_ray_tracing extension and am a bit confused on how to set up the pipeline. Currently I've been following the style of the Reference Path ...
sshashank124's user avatar
1 vote
0 answers
113 views

Most efficient way to calculate signed distance field (SDF) for pixel subsamples?

Looking how to utilize as much parallelization processing as possible for the following task: A screen-sized texture is completely black except for blue pixels which are in close proximity to geometry ...
Daniel Cardin's user avatar
3 votes
0 answers
71 views

Profile GPU performance in Direct3D 11

I'm trying to profile a d3d11 application using queries (pretty much exactly as described here). I noticed something strange with the data I was getting from the queries and I think I managed to ...
leone ruggiero's user avatar
1 vote
3 answers
228 views

How does higher draw distance strain the CPU?

I am looking at many games like Dead Island 2, Red Dead Redemption 2, and Minecraft and I see that while the render distance grows, the CPU load grows with it. Why could this be happening? Lack of ...
Vasilescu Andrei's user avatar
0 votes
1 answer
35 views

Theoretical speedup from sample number in path tracing algorithm

Suppose, in a Kajiya style path tracing algorithm, I have 100x100 pixels, and I am using 32 samples per pixel. So, the total ...
bim's user avatar
  • 135
3 votes
0 answers
66 views

Intel UHD extremely slow copy operations

Is there a way to make copy operations such as CopyResurce(d3d11) and glBlitFramebuffer(ogl) on multi-sample resources faster ...
leone ruggiero's user avatar
1 vote
0 answers
145 views

GLSL : Extremely slow compilation when using loop

I am making multiple gradients with GLSL. However, when I started using a loop instead of a lengthy else if condition, the compile time jumped from 2-4sec to 40sec !...
Ambroise Rabier's user avatar
0 votes
1 answer
57 views

What technique can I use to swap thousands of models per frame?

I need to render a lot of objects that swap their model from frame to frame. Currently, I am putting every model into a single vertex buffer and giving every vertex an id. I store the same id in the ...
Rokit's user avatar
  • 103
1 vote
1 answer
389 views

How to do frustum culling with draw call bundling?

If I'm understanding things correctly (please correct me if I'm wrong): All modern graphics APIs (vulkan, dx12, metal, webgpu) provide ways to bundle and replay draw calls. The bundle includes which ...
Daryl's user avatar
  • 113
0 votes
1 answer
202 views

What are some tools to test performance of a Vulkan based game?

I am developing Vulkan games. It is still a basic rendering program with some cornel boxed data. Apart from testing hairs, calculating fps, what are some tools to apply to test the performance of such ...
Lily's user avatar
  • 31
0 votes
1 answer
260 views

Convert one triangle to another in matrix4x4?

The context openGL instances learning. I want to transform a reference triangle to another one. So final goal is to have one triangle and the instance being a transformation of that initial triangle. ...
Kroma's user avatar
  • 103
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0 answers
191 views

Good way of implementing an efficient tilemap renderer

I am new to graphics programming and I'm trying to create an efficient 2D tilemap renderer (using rust and wgpu (webgpu)). My current implementation My current implementation consists of: A Rust-Vec (...
Q4LEX's user avatar
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1 vote
2 answers
591 views

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 ...
cg_guy420's user avatar
  • 115
2 votes
0 answers
174 views

Sparse voxel oct tree tracing, optimization tricks?

I have a working oct-ree raytracer and I am applying it to the sponza. The algorithm I have designed works like this at a high level: Collide with the bounding box of the model, move your ray to that ...
Makogan's user avatar
  • 1,706
6 votes
1 answer
148 views

Can meshes be reused in raytracing?

In rasterization, at least in the context of game development, it is a common to have many instances of the same 3D object in a scene (think many identical rocks in different sizes/positions/rotations)...
Ilya's user avatar
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2 votes
1 answer
57 views

Different Vertex structures in multi-purpose system

A typical definition of a Vertex structure in C++ might look something like this: struct Vertex { Vec3 pos; Vec3 color; } However, we found ourselves ...
Gary Allen's user avatar
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0 answers
34 views

Is there a Performance Penalty for LOD objects with different topology?

I have a fairly complex-shaped object I've modeled, and in creating the LOD meshes, I've merged some verts, deleted some and even added some after in cases where this manipulation produced an n-gon. ...
Logan J's user avatar
1 vote
1 answer
665 views

Embree: Performance issue when ray casting User Defined Geometry

I am working on the integration of Intel's Embree library into our home renderer to accelerate its rendering time. Our renderer supports various geometry types, such as quads, triangles, but also ...
sschimper's user avatar
2 votes
2 answers
628 views

What does the z-buffer look like in memory?

I am an amateur game developer, and I've been reading a lot on how computer graphics rendering works lately. I was reading on the Z-buffer recently and I can't quite seem to be able to wrap my head ...
Carmo's user avatar
  • 23
0 votes
1 answer
91 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 ...
Anwar Elhadad's user avatar
0 votes
0 answers
41 views

I am trying to find a clip about the art of old computer graphics

I have saw a clip where a guy talked about the art of squeezing some nice graphics into a very small space that was available on old computers. Come to think of it, it sounded something like today's ...
Radoshan's user avatar
1 vote
1 answer
102 views

Is glDispatchCompute(a,b,c) any faster than glDispatchCompute(a*b*c,1,1)?

In my application, there is no inherent 2D or 3D structure to the computer shader instances. So having multiple dimensions doesn't benefit me semantically in any way. I am wondering, whether it still ...
user avatar
3 votes
2 answers
7k 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 ...
François Guthmann's user avatar
11 votes
1 answer
8k views

Performance of Compute Shaders vs. Fragment Shaders for Deferred Rendering

I have written a deferred renderer that can use either a fragment shader or a compute shader to execute the shading pass. Unfortunately, the compute shader implementation runs slower. I'm trying to ...
geometrian's user avatar
  • 1,980
4 votes
1 answer
675 views

Best practice for managing many shaders and merging multiple shaders into one?

I have managed to greatly minimize draw calls on my recent project, but as I'm adding more shaders, I see that I have to switch more times and that is causing a lot of draw calls. What is the best ...
GnoSiS's user avatar
  • 63
1 vote
0 answers
35 views

How are 2D graphics rendered in HTML canvas

I was making some circles in the HTML Canvas element and the circles were so smooth. In a sense that you cant see any vertices. I normally work in unity and I you make a shape in 3d you most of the ...
FutureCake's user avatar
1 vote
0 answers
40 views

Optimizing texture fetches with higher mip levels

Let's say I have some shader program in DirectX or OpenGL rendering a full screen quad. And in a pixel/fragment shader I sample some huge textures at random texture coordinates. That is one same ...
Emil Kabirov's user avatar
1 vote
1 answer
151 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 ...
mkay's user avatar
  • 11
0 votes
0 answers
221 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 ...
MiloticMaster's user avatar
3 votes
1 answer
475 views

Compute shader textures compared 2D float4 arrays

I am wondering is there a difference in performance between using floating point textures as my 2D float4 array vs just passing in 2D float4 arrays? 2D float arrays eliminate the need to do texture ...
wduk's user avatar
  • 177
4 votes
2 answers
609 views

Should you measure mesh complexity in triangles or vertices?

I have seen people using either vertices or triangles as a quick heuristic to estimate mesh memory usage and mesh rendering time. I always thought vertices were better, because the number of vertices ...
Makogan's user avatar
  • 1,706
-1 votes
1 answer
91 views

Are MMORPGs, specifically WoW, limited by their latency in terms of FPS?

It sounds crazy, but I've been doing a lot of reading on exactly why WoW performs very poorly, even on a 1080Ti / 8700k OC'd and overall, a high-end machine. Overclocking the CPU yielded great ...
coolpasta's user avatar
  • 101
6 votes
1 answer
2k views

Why are tessellation shaders disliked?

I often hear that tessellation shaders aren't great for performance reasons. Something along the lines that if you try to use a tessellation shader, you'll find that the data you get out isn't ...
Alan Wolfe's user avatar
  • 7,801
1 vote
0 answers
815 views

Is a smaller local-size/threadgroup-size better for compute shader performance?

A compute shader defines the number of threads it requires to be executed. This number can be called "local size" or "threadgroup size" according to the API, and be factored into 3 separate dimensions ...
wip's user avatar
  • 1,861
2 votes
0 answers
271 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 ...
JarsOfJam-Scheduler's user avatar
4 votes
1 answer
2k views

How does MSAA performance scale?

I'm finding myself increasingly interested in rendering techniques utilizing multisampling for anti-aliasing (obviously), out-of-order transparency, volumes etc. Searching the web for performance ...
Andreas's user avatar
  • 359
9 votes
2 answers
1k 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 ...
lcmylin's user avatar
  • 413
3 votes
3 answers
233 views

Dealing with wasted space when using SIMD on CPU for vector maths

I've been getting interested in SIMD programming on CPU using SSE recently, but I'm a complete noob on the subject. I found this article describing how to make an efficient float3 type using the ...
russ's user avatar
  • 2,392
1 vote
3 answers
126 views

How can an OpenGL visualization run for weeks?

For an art project, I need to make an OpenGL visualization run for at least 4 weeks. Is this possible? I can pretty much choose the rest of the hardware and software.
Holger Ludvigsen's user avatar
6 votes
0 answers
481 views

In Metal, what performance advantages are there, if any, to using vertex descriptors and the [[stage_in]] qualifier?

Metal seems to provide two very different ways to access vertex data in your vertex shader. You can: Create an MTLVertexDescriptor object, which describes vertex ...
lcmylin's user avatar
  • 413
4 votes
1 answer
293 views

Tasks of a professional graphics programmer?

Currently I'm 16 and in high school and I love graphics programming and I'm seriously considering it as a career path. I was wondering what a day as a graphics programmer looks like for offline ...
Arjan Singh's user avatar
  • 2,511
1 vote
0 answers
160 views

Can I voxelize 3D set of points without reconstructing surface first?

I have huge point cloud data I want to render them at interactive frame frate. Process I know is 1.point cloud data 2.triangulate it using delnauy or other triangulation algo 3.surface ...
PixelClear's user avatar
5 votes
1 answer
617 views

Performance impact during texture layer loading

Recently I have been having a rather confusing performance drop with loading in layers of a 2D texture array, but only in one case from what I can tell, leaving me to speculate on why it is happening ...
Lemon Drop's user avatar
2 votes
1 answer
591 views

GPU not reaching 100% usage when frame rate is dropping

I am making an iOS game using Unity. I am testing some shaders that I have made for the game, and in some cases the device will run at under 30 FPS but not have 100% device utilization. Sometimes a ...
Gerald Lang's user avatar
0 votes
2 answers
588 views

Challenges of Offline Rendering

What are some of the challenges of Offline Rendering? I know one problem that is faced is performance and rendering times, are there any more issues? Path Traced photos seem to have reached the ...
Arjan Singh's user avatar
  • 2,511
3 votes
1 answer
838 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 ...
mdkdy's user avatar
  • 2,169
4 votes
1 answer
1k views

Register pressure in Compute Shader

I'm in the process of writing a Ray Tracer using DirectCompute / HLSL. First, eye rays are generated (one per pixel). Then, rays are traced, shaded and reflected in a loop. Also, shadow rays for each ...
David Kuri's user avatar
  • 2,293
6 votes
2 answers
545 views

How can I improve the performance of my custom Global Illumination approach?

I want to experiment with some new stuff about modern rendering techniques and in that way I'm trying to implement a custom GI (somewhere between pathtracing and instant radiosity). My scene is a bit ...
newin's user avatar
  • 363
5 votes
1 answer
399 views

Optimizing performance on hardware

I'm working on a webgl audio visualizer that uses particles, and I want to optimize rendering based on the user's hardware. I'd like to offer a "low quality" and "high quality" setting so that it ...
Nick's user avatar
  • 153
3 votes
1 answer
841 views

How to get unique nearest neighbour?

There's already something called K-nearest neighbour algorithm with gives nearest neighbour to points. But what I want is unique neighbour which is not shared by any other neighbour. I've implemented ...
PradeepBarua's user avatar