Questions tagged [vulkan]
For questions about the Vulkan graphics/compute API.
70
questions
1
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1answer
46 views
Mesh-Shader and layered rendering
In the usual pipeline (vertex, tessellation, geometry and fragment shaders) the geometry can be deformed and in the geometry shader it is possible to copy the generated and deformed geometry in order ...
0
votes
1answer
60 views
Level of detail passed from vertex shader to fragment shader
I am looking at a sample code from a respected source and the mipmap level-of-detail parameter (float) is passed to the vertex shader as a uniform which then passes to the fragment shader without ...
0
votes
0answers
25 views
Offsetting value in shader causes unexpected/wrong logic
Let me explain what I am doing. I am trying to reduce the memory footprint of a voxel based algorithm by storing the voxel data as a hash map in an SSBO, as opposed to a 3D image.
I am visualizing the ...
0
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1answer
44 views
DirectX FVF(Flexible Vertex Format ) equivalent in OpenGL/Vulkan?
Is there any directX FVF(Flexible Vertex Format ) equivalent in OpenGL/Vulkan.
0
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0answers
35 views
vkQueueSubmit never signals fence after swapchain recreation
I'm trying to make a simple vulkan program. The structure of my code is very similar to vulkan-tutorial's, except I'd like to recreate the swapchain without calling vkDeviceWaitIdle. As such, I'm ...
1
vote
2answers
117 views
Is there an efficient way to achieve color blending in compute shaders?
What I want is a function like imageStore, but instead of replacing a value - applying a blend operation to it, e.g. addition. It is not possible to do something ...
1
vote
1answer
32 views
Mat4 that is written to a storage buffer in a compute shader has an altered value when read back
I am attempting to use a compute shader to calculate joint transforms for animations.
I use a loop to calculate the global joint transforms from the local transforms. Relevant code below:
...
0
votes
2answers
228 views
Does Vulkan have the equivalent of OpenGL's separable shader program and pipeline?
If you have a shader pipeline in OpenGL that goes something like the following:
...
2
votes
1answer
53 views
How do fragment shader invocations subgroups map onto triangles?
Should I expect that every invocation/fragment within a subgroup, when using something like subgroupBroadcast(), will belong to the same triangle?
1
vote
1answer
459 views
GLSL Compute Shader Setting "shared" memory buffer size
Is it possible to set the size of the shared memory of a compute shader workgroup from the host code? There is a way to do this in CUDA and I am suspecting that, since there is an GLSL extension to ...
0
votes
1answer
39 views
imageLoad() behavior for non-existent texel
Is there a way to influence the behavior of imageLoad() for accessing an image2D or uimage2D ...
0
votes
1answer
162 views
Vulkan clear color is wrong
I am following https://vulkan-tutorial.com/Introduction to get myself familiar with the Vulkan API. I have gotten to the point where my application is able to draw a triangle. But for some reason the ...
0
votes
1answer
73 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
vote
1answer
251 views
Layer rendering in Vulkan
I am writing a Vulkan video manipulation engine which has the following layers:
Foreground (2D)
Scene (3D)
Background (2D)
Note that each layer may have multiple objects, some of which may be ...
2
votes
1answer
844 views
What are the use cases for multiple render passes?
From what I understand of Vulkan, we have a render pass with its associated image resources and subpasses, and each subpass accesses those resources and may synchronise with previous subpasses to ...
1
vote
0answers
116 views
How could I remove this colour interpolation artefact across a quad?
I've been reading up on a vulkan tutorial online, here: https://vulkan-tutorial.com. This question should apply to any 3D rendering API however.
In this lesson https://vulkan-tutorial.com/...
1
vote
0answers
128 views
OpenGL/D3D11 offscreen render multiple buffering
Recently I've been looking at Vulkan, and one thing that I noticed is that the application is responsible for choosing which buffer to render to in the case of multiple buffering.
This got me thinking:...
2
votes
1answer
238 views
Do you have to group and optimize your draw and shader calls in Vulkan?
This is in reference and contrast to the discipline (or more or less requirement) of opengl to group draws that use the same materials together, to minimize making many draw calls or many switch ...
-1
votes
1answer
109 views
When do people need to work directly with a graphical API (eg: Direct3D) instead of using already made software?
I had this doubt in my head for several months and have been unable to find an answer anywhere on internet.
I know what OpenGL, DirectX, Vulkan, Metal, etc... are, I already know what they are used ...
0
votes
0answers
150 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
votes
1answer
338 views
Feeding acceleration structure to the GPU then raytracing it in a compute shader?
I want to use Vulkan's rasterization to solve for the visibility problem, but once that is done I want to do shading, reflection and transmission through a raytracer which also runs on the GPU. With a ...
1
vote
1answer
273 views
Retrieve real distance from depth buffer for shadow ray (vulkan hybrid rendering)
I'm trying to implement an hybrid renderer based on Vulkan extension VK_NV_ray_tracing. Basically, the rasterizer compute the albedo and depth map of the scene. Then I try to compute the distance from ...
2
votes
1answer
385 views
Vulkan: using gl_PrimitiveID without geometryShader feature
When compiling a glsl fragment shader which reads gl_PrimitiveID with glslc compiler I get the spirv-1.0 with Geometry capability enabled, which is technically ...
1
vote
0answers
20 views
How to handle object drawables?
Currently the graphics API I am using is Vulkan, but I am trying to find a general enough way to represent the following.
In graphics, drawing can be generalized as:
Get vertex buffers and send them ...
0
votes
0answers
276 views
Disable both depth clamp and depth clip in Vulkan (older drivers)
I'd like to store arbitrary float depth, so I have to disable both primitive clipping and depth clamping.
I can disable clipping by setting ...
2
votes
0answers
129 views
Difference between Passing Instance Data to Vertex Shader methods
I see two kinds of passing Instance Data to Vertex Shader in different Examples.
1 .Using a Uniform Buffer and filling in an array, like below
...
4
votes
0answers
206 views
Are there any reasons to use power of two textures with modern mobile platforms?
Are there any reasons to use power of two textures (like 128x128 sized) if one targets modern mobile platforms (with OpenGL ES 3.0, Metal and/or Vulkan)?
With iOS the PVRTC only supports power of two ...
1
vote
0answers
379 views
Compute shader only 5 times faster on the GPU than on the CPU
I'm running following compute shader in Vulkan. worldImage is device local memory that holds the world. resultImage is reference to the memory of the swapchain image:
...
0
votes
1answer
145 views
Only each third image in swapchain is being used, causing flickering
I've managed to write a "small" Vulkan program that outputs a solid color using compute shader directly to swapchain.
However, it doesn't work properly. ImageMemoryBarriers I've setup don't ...
2
votes
0answers
338 views
Out of core rendering
Suppose there is a frame, which is larger that the device memory (I mean, dozens of Gb). And I would like to render to it from a set of textures, which is larger than the host memory (I mean, dozens ...
2
votes
0answers
56 views
1
vote
1answer
360 views
How was computer graphics libraries or gtk,qt programmed?
I am wondering how was first graphic or image libraries created,I know C and Python ,I want to create plotting application,and I cant imagine these libraries(QT,OpenGL,Vulkan) written by C,how can I ...
2
votes
2answers
1k views
Multiple swapchains in Vulkan app with ImGui
I am integrating imgui into my app using glfw + vulkan example.
The function vkCreateSwapchainKHR() is also called by imgui setup logic in addition to my app on the same device and it fails with "...
0
votes
2answers
795 views
shaderc compile through api with #include
I'm using shaderc to compile glsl code in to spirv module and pass to pipelie in REAL-TIME. I want to use #include to reuse some of the shader code but shaderc is having problems recognizing it. Any ...
7
votes
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 ...
3
votes
1answer
1k views
Vulkan: efficient way to update VBO mesh vertices?
I would like to change/add/remove some mesh vertices in existing VBO's (while deforming and remeshing 3D objects) . With OpenGL I would have to reload whole vertex VBO's. I suppose with Vulkan there ...
2
votes
1answer
764 views
Clarifying vulkan glsl std140
So I have a uniform block that looks something lile this
{
mat4;
mat4[128];
uint[16]
}
The block should total up to 8320 bytes. After aligning by 256 bytes for nvidia, that brings the total ...
3
votes
1answer
2k views
What is the oldest hardware able to feasibly support Vulkan?
What is the oldest hardware or minimum requirements conceptually able to support a fully hardware-accelerated Vulkan implementation? I am not referring to what implementations are currently available ...
2
votes
1answer
263 views
Inconsistent behavior involving VkPhysicalDeviceFeatures.fillModeNonSolid
I departed slightly from the Vulkan tutorial I was following and decided to draw a wireframe instead of a solid triangle.
As soon as I call ...
4
votes
1answer
307 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 ...
1
vote
1answer
533 views
How do I swap the buffers when using a Win32 window with Vulkan?
I was recently told here how to manage the integration between Vulkan and Win32.
I am writing a windowing library like "GLFW", that is only going to support Vulkan; I have now come to the point where ...
2
votes
1answer
1k 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 ...
3
votes
1answer
1k views
Is a single shader and 1x1 pixel white sampler more efficient than frequent switching between shaders with and without samplers?
I have some existing OpenGL code that I am porting to Vulkan. The question is somewhat relevant to both OpenGL and Vulkan.
I am rendering some primitives using textures, some single channel, others ...
1
vote
2answers
6k views
FPS counter for a simple Vulkan app
What measurement/monitoring tools could I use to get the FPS values for a simple Vulkan app?
Thanks in advance
6
votes
1answer
4k views
How do I create a Win32 window with a Vulkan context?
I am aware of libraries that already do this (like GLFW), but I would actually prefer do all of the window and context creation by myself.
10
votes
1answer
7k views
What are Metal and Vulkan?
I keep coming across the terms 'Metal' and 'Vulkan' on this site.
Guessing this to be some CG software, I'm interested to know what these are exactly and what the intended and most common usage is.
A ...
1
vote
1answer
1k views
What is a "Vulkan Extension"?
When creating a VkInstance, you need to setup the API's extensions that are going to be used by your application (for example you need an extension to interface with the window system on desktop ...
5
votes
2answers
5k views
Can i compile my shaders to SPIR-V without using glslangValidator?
I'm making a cross-platform application, and i need my shaders to be compiled to SPIR-V for both Opengl and Vulkan. It seems that the only way to do so is to call a separate program, called "...
0
votes
2answers
1k 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 ...
2
votes
1answer
2k views
Best way to clear a framebuffer image without drawing?
So I have a framebuffer image which later acts as input to a compute shader, and some frames there is geometry drawn to the framebuffer, but some frames this is not necessary.
The thing is, in my ...
