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Today, 05:38 AM

Dark Photon replied to a thread Questions about glCullFace and gl_Fragcoord.z in OpenGL coding: beginners

They're the same. So if and only if the fragment depth is written to the depth buffer (render target has depth buffer, fragment passes...

1 replies | 42 view(s)

Today, 03:53 AM

GClements replied to a thread Clipping plane by using stencil buffer for mesh objects with unclosed tubes in OpenGL coding: beginners

Is the presence of uncapped tubes the only feature of the problematic meshes? Are they 2-manifold surfaces otherwise? Is face winding consistent...

2 replies | 59 view(s)

Today, 01:55 AM

McStones replied to a thread Depth buffer doesnt work when using Multisampled Antialiasing in OpenGL coding: advanced

I finally got it to work... It seemed like I`ve made the mistake... As you can see, my depth attachment was not valid, so the shader has read...

5 replies | 183 view(s)

Yesterday, 05:07 PM

CK1980 started a thread Sprites-Layering in OpenGL coding: beginners

Hello, I'm totally new here and want to learn some WebGL/OpenGL ES2.0 stuff. I want to make a very simple scrollable 2D Game for myself.. just...

0 replies | 34 view(s)

Yesterday, 04:14 PM

jerome503 started a thread Questions about glCullFace and gl_Fragcoord.z in OpenGL coding: beginners

Hello. I have questions about glCullFace and gl_Fragcoord.z. First, when I turn on and off glCullFace, the depth value from shader stage does...

1 replies | 42 view(s)

Yesterday, 03:04 PM

john_connor replied to a thread Clipping plane by using stencil buffer for mesh objects with unclosed tubes in OpenGL coding: beginners

i'd try to use a 3D texture to store the "slices", or an 2D array texture, but that would require to program your own pipeline (without legacy GL...

2 replies | 59 view(s)

Yesterday, 12:42 PM

michael_ca started a thread Clipping plane by using stencil buffer for mesh objects with unclosed tubes in OpenGL coding: beginners

:doh: I have a project, which requires to intersect anatomical mesh objects along specified axis (e.g. from head to foot) into a series of 2D...

2 replies | 59 view(s)

Yesterday, 08:30 AM

McStones replied to a thread Depth buffer doesnt work when using Multisampled Antialiasing in OpenGL coding: advanced

I tried to read from the Multisampled depth buffer... but these results are not supposed to be depth values, at least not for that scene. It was...

5 replies | 183 view(s)

Yesterday, 06:34 AM

hadichko started a thread NURBS surface using OpenGL and glut in OpenGL under Windows

Hi, I am trying to display an extruded circle using OpenGL and the glut library under Windows and Visual C++. The final surface should look like a...

0 replies | 48 view(s)

Yesterday, 05:59 AM

Dark Photon replied to a thread Depth buffer doesnt work when using Multisampled Antialiasing in OpenGL coding: advanced

Ok, that's a start. How are you determining this? For instance, by using texelFetch on the MS depth buffer in a shader run in a subsequent pass on...

5 replies | 183 view(s)

Yesterday, 03:20 AM

McStones replied to a thread Depth buffer doesnt work when using Multisampled Antialiasing in OpenGL coding: advanced

I`ll try to explain it a little bit better. My problem is, that it seems like depth values are not written to the depth buffer, which is also a...

5 replies | 183 view(s)

08-15-2017, 01:51 PM

michael_ca started a thread Clipping plane by using stencil buffer for mesh objects with unclosed tubes in OpenGL under Windows

:doh: I have a project, which requires to intersect anatomical mesh objects along specified axis (e.g. from head to foot) into a series of 2D...

0 replies | 90 view(s)

08-15-2017, 09:55 AM

technologist replied to a thread glm::rotation syntax help in OpenGL coding: beginners

OK it worked at first but then something happened. I wrote a little program below to set the vector and to then print its contents. I already...

2 replies | 123 view(s)

08-15-2017, 09:44 AM

Asylum replied to a thread OpenGL UBO performance issue XOR fence sync problem in OpenGL coding: advanced

Well it is a CAD program and it already has a lot of problems with GPU memory. Of course I don't know what the driver does in the background with...

4 replies | 117 view(s)

08-15-2017, 09:29 AM

mhagain replied to a thread OpenGL UBO performance issue XOR fence sync problem in OpenGL coding: advanced

The Intel is a shared memory architecture; in general you can expect differrent performance, yes. Define "waste memory", please. This is...

4 replies | 117 view(s)

08-15-2017, 08:44 AM

haseeb qureshi started a thread terrain generation using C++ and Opengl in OpenGL coding: beginners

Hi i want generate terrain using a 32bit Heightmap Actually i want to make a terrain engine which generates runtime terrain using heightmaps i am...

0 replies | 50 view(s)

08-15-2017, 06:32 AM

Asylum replied to a thread OpenGL UBO performance issue XOR fence sync problem in OpenGL coding: advanced

@mhagain: Yes, these are (mostly) obvious. But as I mentioned, on the Intel HD 4600 my 2nd method is just as fast as the 1st (and from your...

4 replies | 117 view(s)

08-15-2017, 06:03 AM

mhagain replied to a thread OpenGL UBO performance issue XOR fence sync problem in OpenGL coding: advanced

For problem 1, "UBO with glBufferSubData is extremely slow", performance will heavily depend on how often you update your UBO(s). Generally...

4 replies | 117 view(s)

08-15-2017, 05:37 AM

Dark Photon replied to a thread Depth buffer doesnt work when using Multisampled Antialiasing in OpenGL coding: advanced

"Doesnt work" doesn't tell us much. Please tell us what evidence you have that the "depth buffer doesnt seem to work". Moreover, how do you know...

5 replies | 183 view(s)

08-15-2017, 05:22 AM

Dark Photon replied to a thread No MSAA support on my linux ? in OpenGL on Linux

Install the NVidia OpenGL drivers (Download link). They've supported MSAA via OpenGL on Linux for nearly 20 years. Check your Ubuntu package...

2 replies | 140 view(s)

08-15-2017, 02:56 AM

Asylum started a thread OpenGL UBO performance issue XOR fence sync problem in OpenGL coding: advanced

(this is a duplication of the discussion I started on the AMD community forums) This topic is aimed to discuss two different problems: - UBO...

4 replies | 117 view(s)

08-14-2017, 09:44 AM

mhagain replied to a thread glm::rotation syntax help in OpenGL coding: beginners

glm::rotate is defined such that the angle and axis use the same base type; so assuming that glm::vec3 is a vector of 3 floats, then the angle must...

2 replies | 123 view(s)

08-14-2017, 09:30 AM

technologist started a thread glm::rotation syntax help in OpenGL coding: beginners

Trying to rotate x degrees around a given vector glm::vec3 myRotationAxis( 3, 6, 9); glm::rotate( 45, myRotationAxis ); but am getting an...

2 replies | 123 view(s)

08-14-2017, 08:50 AM

john_connor replied to a thread Assimp: skeletal animation: How to in Math and Algorithms

sorry for resurrecting this thread ... :dejection: just to make sure that i'm on the right track, i want to ask: how do i have to build...

6 replies | 924 view(s)

08-14-2017, 07:39 AM

scottiler replied to a thread Glew libraries and dll for MinGw in OpenGL coding: beginners

Where are these instructions? All the Windows information is geared towards Visual Studio.

3 replies | 197 view(s)

08-14-2017, 06:58 AM

McStones started a thread Depth buffer doesnt work when using Multisampled Antialiasing in OpenGL coding: advanced

I already posted this on gamedev.stackexchange but its my third post about openGL stuff without any attention so I would like to try here. I'm...

5 replies | 183 view(s)

08-14-2017, 12:06 AM

Silence replied to a thread No MSAA support on my linux ? in OpenGL on Linux

It most probably comes from the fact that you run under a virtual machine. So whether stick with the VM. And then you'll have to simulate MSAA...

2 replies | 140 view(s)

08-13-2017, 03:09 PM

Carmine replied to a thread using mouse in NeHe programs in OpenGL coding: beginners

When you post code, it would help a lot if you use indentation to clarify the logic, AND put the code between and tags (without the spaces). ...

5 replies | 311 view(s)

08-13-2017, 11:37 AM

Silence replied to a thread Mouse picking with OpenGL in OpenGL coding: advanced

And in order to be as respectful as the posters who tried to help, may we know what was the issue and how you solved it ?

7 replies | 277 view(s)

08-13-2017, 08:54 AM

paul_g_griffiths replied to a thread using mouse in NeHe programs in OpenGL coding: beginners

Or https://learnopengl.com/ Looking back at this and speaking generally and not at you specifically, it seems you're trying to fly before you can...

5 replies | 311 view(s)

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